Device and method for fastener element retention and installation

Abstract

A method and a device are disclosed which seek to improve productivity of the installation of fasteners. This improved productivity is achieved by holding a fastener to a driving tool with a mechanical means for a substantial portion of an installation sequence to prevent nuisance disengagement between fasteners and their driving means including dropping of fasteners early in an installation cycle. The productivity of this fastener holding approach is best realized by allowing a streamlined operation with little interaction between the fastener driving device and an operator. Specifically, a fastener installation device is described which requires no direct manipulation of said device during the sequence of loading a fastener into said device, installation of said fastener with said device, disengagement of said device from said fastener to allow complete installation of said fastener, and loading a subsequent fastener.

Claims

1. A system for advancing a fastener comprising: a. means for engaging a first fastener head of a first fastener and causing the first fastener head to be subjected to forces which cause the first fastener head to rotate; b. means for storing energy; by installing said first fastener into a workpiece; c. means for mechanically obstructing disengagement of a second fastener head of a second fastener from the means for engaging, by a release of stored energy from said means for storing energy, said release of stored energy is able to be triggered by said second fastener being engaged with the means for engaging; and d. means for interfacing a source of rotary power; so as to provide for an ability to rotate said means for engaging.

2. The system of claim 1 wherein said means for engaging comprises a bit having a distal end with a recessed end portion therein configured to engage a perimeter of a non-circular external head portion of a fastener.

3. The system of claim 1 wherein said fastener head is an independent hexagonal nut and said means for mechanically obstructing allows for initial retention and subsequent movement of said independent hexagonal nut along a threaded shaft by a plurality of radially retractable balls.

4. The system of claim 3 wherein the means for mechanically obstructing can engage a threaded shaft to assist alignment between the threaded shaft and a hexagonal nut.

5. The system of claim 1 wherein said means for engaging comprises a bit insert configured to mate with a fastener head void.

6. A system of claim 5 which further comprises a plurality of radially moveable balls in combination with a plurality of axially movable balls.

7. The system of claim 1 further comprising a means for adjustment to alter a forward most position of the means for mechanically obstructing relative to the means for engaging a fastener head.

8. The system of claim 1 further comprising an internal clutch means for disengaging transmission of rotary power to said fastener for controlling a driven depth of a fastener into a workpiece.

9. A system for installing a fastener comprising: a. a fastener driver device comprising: i. an outer sleeve; ii. a carrier sleeve, at least partially disposed within said outer sleeve; iii. a bit, disposed, at least in part, within said carrier sleeve, and said bit having a distal end with a recessed end portion therein configured to engage a perimeter of a head portion of a fastener, of a type having a threaded shaft; iv. a shuttle, disposed within said bit; v. a shuttle spring disposed between said shuttle and said bit; vi. a carrier sleeve spring disposed between said bit and said carrier sleeve; and vii. a sleeve spring disposed between said carrier sleeve and said outer sleeve; wherein said fastener driver device is further configured for responding to a head first insertion of said fastener, into said distal end of said bit beyond an internal location in said carrier sleeve where stored energy within said carrier sleeve spring causes said carrier sleeve to slide distally, which then, by utilizing energy stored in a third spring, allows said outer sleeve to push, a retention component radially inward while said outer sleeve moves distally relative to said carrier sleeve; and wherein said fastener driver device is further configured for creating a mechanical obstruction to removal of said fastener from said fastener driver device, by engaging said retention component with a distal portion of said head portion.

10. The system of claim 9 further wherein said head portion is hexagonal.

11. The system of claim 9 further comprising a source of rotary power which mates with a hexagonal quick-change shank portion of said bit.

12. The system of claim 11 where said bit is configured to receive therein and transmit rotary power to said head portion.

13. The system of claim 9 wherein: said shuttle is slidably located in a longitudinal bore within said bit; and said shuttle has: a proximal section of a first outer diameter which is slightly smaller than a diameter of longitudinal bore to allow relative sliding motion between said shuttle and said bit; a distal section of a second diameter distal to said proximal section and also of a smaller diameter; a third section which is distal to distal section and third section has a diameter which is smaller than distal section; and a circumferential shoulder between the proximal section and the distal section.

14. The system of claim 9 further comprising: a trigger detent ball located in a radial passage within bit and protrudes past an outer surface of a front section of a driving bit, and protrudes into an internal groove of sleeve.

15. A device for installing fasteners comprising: a. a bit for engaging a portion of a first fastener; b. a means for mechanically obstructing disengagement of the first fastener from said bit; c. a means for storing energy collected by installing the first fastener into a workpiece; d. a triggering mechanism to restrict the means for mechanically obstructing into a first retracted position following installation of the first fastener into the workpiece to allow a second fastener to be subsequently loaded into the device, without interference from said means for mechanically obstructing; and e. said triggering mechanism configured to release said energy collected by installing the first fastener into the workpiece, upon loading of said subsequent fastener into said device, said energy being a sole source of energy to deploy and position said means for mechanically obstructing from the first retracted position to a second extended position.

16. The device of claim 15 wherein said means for mechanically obstructing is released after said first fastener is partially installed into said workpiece.

17. The device of claim 16 wherein an element is installed on a distal end of said device to minimize abrasion to said workpiece.

18. The device of claim 15 wherein said device further comprises a longitudinally translating sleeve which longitudinally positions the means for mechanically obstructing.

19. The device of claim 15 wherein the means for mechanically obstructing comprises a plurality of spherical balls.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a section view of a first embodiment with a fastener in the loaded position.

(2) FIG. 2 is a section view of a first embodiment in the unloaded position, ready for a fastener to be loaded

(3) FIG. 3 is a section view of a first embodiment where a fastener is being loaded, near the point that the system will trigger to the loaded position

(4) FIG. 4 is a section view of a first embodiment where a fastener has been fully loaded and is ready to be installed

(5) FIG. 5 is a section view of a first embodiment where a fastener is being installed in a work piece

(6) FIG. 6 is a section view of a first embodiment where a fastener has been entirely installed in a workpiece and the device has been partially retracted from the work surface.

(7) FIG. 7 is an isometric view of a first embodiment with a fastener loaded.

(8) FIG. 8 is an isometric view of a first embodiment installed in a power drill.

(9) FIG. 9 is an exploded isometric view of a first embodiment.

(10) FIG. 10 is a section view of a second embodiment of the present invention.

(11) FIG. 11 is a section view of a fourth embodiment illustrated with a fastener containing a geometric drive depression in an unloaded state.

(12) FIG. 12 is a section view of a fourth embodiment illustrated with a fastener containing a geometric drive depression in a loaded state, ready to be installed.

(13) FIG. 13 is a section view of a fourth embodiment with a fastener that has been installed to the point an optional clutch mechanism has disengaged torque transmission to the fastener.

(14) FIG. 14 is a section view of a fourth embodiment at the state illustrated in FIG. 12 illustrating the clutch mechanism in a torque transmitting state.

(15) FIG. 15 is a section view of a fourth embodiment at the state illustrated in FIG. 13 illustrating the clutch mechanism in a non-torque transmitting state.

DETAILED DESCRIPTION

List of Figure Numerals

(16) The following table lists a description of the numerals used to annotate figures in this application.

(17) TABLE-US-00001 10 A first embodiment of the present invention 11 Trigger shuttle 12 Driving bit 13 Distal face of bit 12 14 carrier sleeve 16 Cam sleeve 18 Trigger ball 20 Retention balls 21 Radial passages for retention balls 22 Trigger shuttle spring 24 Carrier sleeve spring 26 Cam sleeve spring 27 Bumper 28 Washer 30 Retaining device 31 Internal circumferential groove 32 Retaining device 33 Forward distal end 34 Fastener 35 Driven proximal end 36 Hexagonally shaped quick-change shank 37 Top washer surface of fastener 34 38 Intermediate section of driving bit 40 Front section of driving bit 42 Circumferential groove for retaining device 44 Shoulder formed between the front and intermediate sections 46 Radial passage for trigger detent ball 48 Formed geometrical profile for torsionally engaging a fastener head 54 Longitudinal bore of first diameter (in distal end of driving bit 12) 56 Longitudinal bore of a second smaller diameter 60 section of trigger shuttle of a first outer diameter 62 section of trigger shuttle of a second diameter, less than the diameter of 60 63 shoulder in trigger shuttle formed between sections 62 and 64. 64 section of trigger shuttle of a third diameter smaller than section 62 66 Shoulder formed between sections 60 and 62 70 Internal circumferential groove (in sleeve 14, for the triggering ball) 71 Internal collar of sleeve 14 72 shoulder (at proximal end of circumferential groove 70) 73 External collar of sleeve 14 74 Front section of jaw retaining sleeve 14 76 Internal collar of cam sleeve 16 78 Distal shoulder of internal collar 76 80 Groove in sleeve 16 to receive a scratch resisting bumper 82 Distal face of sleeve 16 100 Work Piece 1 102 Work Piece 2 104 Work surface 106 Power Drill 120 Trigger shuttle 121 Central bore in trigger shuttle 122 Drive bit 123 Radial passage for retaining jaws 124 Sleeve spring 126 Cam sleeve 128 Trigger balls 130 Radial passage for trigger balls 132 Nut 134 Bolt 136 Driver engaging depression 138 A second embodiment of the present invention 140 Washer 142 Retaining device 144 Internal circumferential groove in cam sleeve 126 146 Longitudinal threaded bore 148 Set screw 160 A fourth embodiment of the present invention 161 Fastener 162 Bit holder 164 Bit insert 166 Carrier sleeve 168 Cam sleeve 170 Spring retainer sleeve 172 Adjustable ring 174 Jam nut 176 Retention balls 178 Clutch balls 180 Spacer ball 182 Intermediate ball 184 Trigger balls 186 Retaining ring 188 Retaining ring 190 Set screw 192 Face (of sleeve 168) 194 Face (of sleeve 166) 196 Face (of sleeve 166) 198 Face (of spring retainer sleeve 170) 200 Internal groove (on carrier sleeve 166 for triggering) 202 Internal groove (on carrier sleeve 166 for clutch) 204 Shoulder 206 Bore face 208 Workpiece 210 Circumferential groove

(18) Now referring to the figures and to the associated descriptive text below, wherein like numbers refer to like matter throughout.

(19) FIG. 1 is a cross-sectional view of a first embodiment with a fastener in the loaded position. For clarity, this figure focuses primarily on identifying the individual components of the assembly, not features of the components. The device for retaining and driving fasteners of a first embodiment is illustrated generally as 10. The assembly includes a trigger shuttle 11, a driving bit 12, a carrier sleeve 14, a cam sleeve 16, a trigger ball 18, a plurality of radially spaced retention balls 20, a trigger shuttle spring 22, a carrier sleeve spring 24, a cam sleeve spring 26, a washer 28, a retaining device 30, a retaining device 32 disposed in circumferential groove 31 and a fastener 34. The assembly has a forward distal end 33 and a driven proximal end 35. The driven end of drive bit 12 is formed with a shank 36 to be received by a common drive device, such as an impact driver, drill, screw gun, or screw driver. This shank 36 is shown as a standard quick change design. A scratch resistant bumper 27 is optionally included to reduce the likelihood of scratching a work surface receiving fastener 34. Bumper 27 is held in a circumferential groove 80 in sleeve 16.

(20) FIG. 2 is a cross-sectional view of a first embodiment illustrated generally as 10, configured in the unloaded position, ready for a fastener to be loaded. In this figure, previously shown shank 36 has been cropped off the proximal side of the device as it may take the form of many conventional shank styles, the specifics of which are not central to the function of this embodiment. The distal end of drive bit 12 has a bore 48 for receiving the external drive geometry of a fastener. The trigger shuttle 11 is slidably located in a longitudinal bore 54 within bit 12. The trigger shuttle 11 has a proximal section 60 of a first outer diameter which is slightly smaller than the diameter of bore 54 to allow relative sliding motion between trigger shuttle 11 and bit 12. Shuttle 11 includes a section 62 of a second diameter distal to section 60 and also of a smaller diameter than 60. A third section 64 is distal to section 62 and section 64 has a diameter which is smaller than section 62. Trigger shuttle 11 has a circumferential shoulder 66 between sections 60 and 62. A trigger detent ball 18 is located in a radial passage 46 within bit 12. A shuttle spring 22 located largely in bore 56 of bit 12 reacts between bit 12 and shuttle 11.

(21) In the unloaded configuration of device 10, generally depicted by this figure, the trigger detent ball 18 is restricted against radial travel towards the center axis of the device by shuttle 11. Detent ball 18 protrudes past the outer surface of the front section of the driving bit, 40 and protrudes into the internal groove 70 of sleeve 14. The proximal shoulder 72 of groove 70 will be in contact with trigger ball 18 due to spring 24 reacting between bit 12 and sleeve 14 with assistance from an internal collar 71 within sleeve 14, washer 28, and retaining device 30 installed in a circumferential groove 42 of bit 12. This configuration limits the forward position of sleeve 14 relative to bit 12. The forward position of shuttle 11 is limited by shoulder 66 bearing against ball 18. A plurality of balls 20, shown here as spherical members, are disposed in radial bores 21 and are limited from traveling radially inward towards the center axis of the tool by contact with the front section 40 of driving bit 12 so as to leave the device unobstructed for the loading of a fastener. Balls 20 protrude past the outer surface of the front section 74 of sleeve 14. By balls 20 protruding past the outer surface of section 74 and contacting a distal shoulder 78 of internal collar 76 in sleeve 16, the balls 20 will limit the forward position of sleeve 16 relative to sleeve 14 while spring 26 reacts between sleeve 14 and sleeve 16, thus urging sleeve 16 forward. Bit 12 has an intermediate section 38 of smaller diameter than the front section 40, thus forming a shoulder 44 between those sections. Further, the internal collar 71 within sleeve 14 has a bore slightly larger than the diameter of intermediate section 38 to allow relative longitudinal motion. In this configuration of device 10, there is a gap between shoulder 44 and internal collar 71.

(22) FIG. 3 is a cross-sectional view of a first embodiment where a fastener has been partially loaded into device 10 after it was in the state shown in FIG. 2. Arrows have been superimposed on various bodies to indicate the direction they have moved since the preceding state illustrated in FIG. 2, where for purpose of illustration bit 12 is assumed to be the fixed reference frame.

(23) At this stage, device 10 is near the point that it will trigger to the loaded position where fastener 34 will become retained in device 10. Fastener 34, which is depicted as a hex washer head screw, has been inserted into driver bit 12 and has pushed trigger shuttle 11 some distance toward the driven proximal end of the device, whereby spring 22 is further compressed. Ball 18 has traveled radially inward from its prior position due to contact with shoulder 72 on sleeve 14 under the force of spring 24. Ball 18 is no longer in contact with shoulder 66, and ball 18 has now started to travel radially inward past the surface of section 62 of trigger shuttle 11. Ball 18 is bearing against circumferential shoulder 63 to resolve the vertical forces exerted by sleeve 14 under the force of spring 24.

(24) FIG. 4 is a cross-sectional view of a first embodiment where a fastener has been fully loaded into device 10 and is ready to be installed in a workpiece. Arrows have been superimposed on various bodies to indicate the direction they have moved since the preceding state illustrated in FIG. 3, where, for purpose of illustration, bit 12 is assumed to be the fixed reference frame.

(25) Between FIG. 3 and FIG. 4, fastener 34 was pushed further rearward into bit 12, moving shuttle 11 rearward allowing ball 18 to fully bypass shoulder 63. With ball 18 in this position, it no longer protrudes past the outer surface of section 40 of bit 12 and therefore no longer limits the longitudinal position of sleeve 14, which thus has traveled forward under the force of spring 24 until shoulder 44 of bit 12 contacted internal collar 71 of sleeve 14. In this position, balls 20 are freely able to travel inward in their respective bores 21, said bores which are shaped so as to prevent the balls from fully passing inwards through and out of said bores should a device be manipulated to such a position without a fastener installed. Balls 20 will be forcefully pushed radially inwards in radially spaced bores 21 by sleeve 16 traveling forward during the triggering cycle given the force of spring 26 pushing sleeve 16 forward whereby circumferential shoulder 78 bears against balls 20 while sleeve 16 travels forward relative to sleeve 14. Once the internal collar 76 bypasses balls 20, the inner surface of collar 76 will prevent travel of balls 20 radially outward, thus mechanically locking fastener 34 into device 10. There is a minimal clearance between balls 20 and the fastener 34 to maintain alignment of device 10 and fastener 34 to be largely coaxial. The forward position of sleeve 16 is limited relative to sleeve 14 by contact between external collar 73 on sleeve 14 and a retaining device 32, which is held in an internal circumferential groove 31 in sleeve 16. It should be noted that an intermediate section 38 of driver bit 12 is sized to be longitudinally slidable within the central bore of internal collar 71 in sleeve 14.

(26) FIG. 5 is a cross-sectional view of a first embodiment where a fastener 34 is being installed using device 10. Arrows have been superimposed on various bodies to indicate the direction they have moved since the preceding state illustrated in FIG. 4, where for purpose of illustration bit 12 is assumed to be the fixed reference frame.

(27) In this diagram, fastener 34 is depicted as a self drilling hex washer head screw and a first workpiece 100 is shown containing a hole 106 prior to the installation of fastener 34. A second workpiece 102 is shown with the fastener 34 protruding through it after the drill point on fastener 34 drilled through it as is typical for screws of this nature. In this diagram, fastener 34 is only partially installed as can be seen from the distance between the exterior work surface 104 of workpiece 100 and the underside of the head on fastener 34. By thrust being applied to device 10 during the install process while fastener 34 progresses forward, bumper 27 has contacted work surface 104 and has been retracted proximally along with sleeve 16. Sleeve 14 is limited against further travel forward due to contact between collar 73 with an internal shoulder in sleeve 16. In this position of sleeve 16 relative to sleeve 14, sleeve 16 no longer limits the outward radial travel of balls 20 such that further the progression of fastener 34 forward relative to sleeve 14 has pushed balls 20 radially outward. From this state, further installation of fastener 34 will cause bit 12 to progress forward relative to sleeve 14 such that the gap between shoulder 44 and collar 71 continues to grow while further compressing spring 24 in the process until the point fastener 34 has been fully installed.

(28) FIG. 6 is a cross-sectional view of a first embodiment where a fastener has been entirely installed in a workpiece and device 10 has been partially retracted from the work surface 104. Arrows have been superimposed on various bodies to indicate the direction they have moved since the preceding state illustrated in FIG. 5, where for purpose of illustration bit 12 is assumed to be the fixed reference frame.

(29) A gap now exists between the top washer surface 37 of fastener 34 and the distal face 13 of bit 12. Trigger shuttle 11 is no longer in contact with the head of fastener 34 so that spring 22 has pushed shuttle 11 forward to the point that ball 18 has been pushed radially outward into internal groove 70 by section 62 of shuttle 11, and the forward position of shuttle 11 is limited by ball 18 bearing against shoulder 66.

(30) Further retraction of device 10 away from work surface 104 will cause sleeve 14 to slide further forward relative to bit 12 under the force of spring 24 until shoulder 72 contacts ball 18, which will then limit the forward position of sleeve 14 relative to bit 12. Still further retraction of device 10 from work surface 104 will cause sleeve 16 to slide forward relative to sleeve 14 under the force of spring 26 until shoulder 78 contacts balls 20, which thus will limit the forward position of sleeve 16 relative to sleeve 14.

(31) Further retraction of device 10 will cause bumper 27 to lose contact with work surface 104. At that point, device 10 will be ready for loading of a subsequent fastener without requiring any direct manipulation. Bumper 27 is designed to prevent contact between face 82 of sleeve 16 or the distal face of sleeve 14 with work surface 104 to minimize marring concerns that may otherwise be present. Bumper 27 may be a soft polymer, elastomer, or rubber. It may also be replaced by a thrust bearing which could take many conventional forms including, but not limited to, a plain thrust bearing of low-friction plastic or a thrust bearing assembly containing roller elements, such as spherical balls with a soft material being applied on the distal external face of such a bearing assembly.

(32) FIG. 7 is an isometric view of a first embodiment with a fastener 34 loaded into device 10. Note that this is the same mechanical state or configuration as detailed in FIG. 1 and FIG. 4.

(33) Note that while a hex washer head fastener is shown in these figures, this design was chosen as a particularly challenging type of application. The present invention may be utilized for fasteners of other external drive geometries including, but not limited to, square, hexagon or six-lobular with or without a washer head by making simple modifications to the shape of current components. For example, a separate hexagonal nut and a flat round washer could be retained together into device 10 with the mechanisms as illustrated. Loading of such individual fasteners may benefit from utilizing a fixture to stage a nut and washer pair prior to loading for productivity.

(34) FIG. 8 is an isometric view of a first embodiment installed in a power drill. Device 10 is shown installed into the chuck of a power drill 106. A fastener 34 has been installed in device 10 where device 10 would be in the state illustrated by FIG. 4.

(35) It should be understood that the power drill 106 is only one example of a source of rotary power. Other examples are a ratcheted or non-ratcheted screw driver handle, configured to be grasped and turned by a human hand, and having an interface for receiving and retaining a drill bit, screw driver tip insert or other shaft. Still another example of a source of rotary power could be a ratcheted or non-ratcheted wrench or the like or any suitable substitute.

(36) FIG. 9 is an exploded isometric view of a first embodiment. The device for retaining and driving fasteners of the first embodiment is illustrated generally as 10. The assembly includes a trigger shuttle 11, a driving bit 12, a carrier sleeve 14, a cam sleeve 16, a trigger ball 18, a plurality of radially spaced retention balls 20, a trigger shuttle spring 22, a carrier sleeve spring 24, a cam sleeve spring 26, a washer 28, a retaining device 30, and a retaining device 32. A scratch resistant bumper 27 is optionally included.

(37) Following the illustrations of FIGS. 2 through 9, the following describes the method of installing two fasteners utilizing the illustrated embodiment. For purpose of this illustrative sequence, the entire device 10 is assumed to be installed in a powered drill via shank 36. The device will generally be configured in the state shown in FIG. 2, where it is ready for a fastener to be loaded. A user may hold a powered driver in one hand with device 10 installed and then pick up a fastener 34 with a second hand, grasping it near the end opposite of the head. The user can then push the fastener 34 into device 10, using tactile feedback to assist with aligning the drive geometry on fastener 34 with the drive geometry of the bit 12. FIG. 3 shows a fastener 34 pushed part way into device 10 where trigger shuttle 11 has been pushed somewhat rearward, device 10 being on the verge of releasing stored spring energy with slightly further rearward travel of shuttle 11, which will serve to slide a carrier sleeve 14 forward.

(38) FIG. 4 shows the device just a moment later after fastener 34 was pushed in slightly further, pushing shuttle 11 rearward which in turn allows ball 18 to move radially inward thus beginning the triggering action of the device to position the carrier sleeve 14 forward, subsequently allowing outer cam sleeve 16 to push retention balls 20 radially inward while cam sleeve 16 moves forward relative to carrier sleeve 14, thereby establishing a secure retention of the fastener. The user never needed to touch device 10 directly throughout the loading process, they only needed to push the fastener in.

(39) At this point, device 10 can then be used to install fastener 34 into a work surface while holding the fastener with significant retention force, which is an object of the present invention. A user will begin to install the fastener and after the amount of the fastener shown protruding out of the device in FIG. 4 has been installed, device 10 will contact the work surface and cam sleeve 16 will begin to retract relative to fastener 34. FIG. 5 shows device 10 and fastener 34 in a state where fastener 34 has been partially installed into a workpiece. Cam sleeve 16 has been retracted due to contact with a work surface. The current position of cam sleeve 16, in turn, allows retention balls 20 to move radially outward if so urged. No further restrictions will impede forward motion of fastener 34 or bit 12 to fully complete the installation of the fastener. After the fastener is fully installed, a user may freely pull the powered drill and thus device 10 away from the work surface. FIG. 6 shows device 10 after the user has pulled slightly away from the work surface.

(40) After additional motion away from the work surface, the jaw sleeve 14 and cam sleeve 16 will both be able to travel forward an additional amount until they reach the state which is shown in FIG. 2. Note that the user did not need to directly touch device 10 at any point when installing fastener 34. At that point, with device 10 again in the state shown by FIG. 2, it is configured to freely receive another fastener. Without setting the drill down, a user may pick up a subsequent fastener and push it into device 10, whereby the state of FIG. 3 will quickly be passed through and the device will rest at the state of FIG. 4 ready to install a fastener. The user can then install the second fastener 34 into a work surface at which the point of partial installation shown by FIG. 5 will be passed through on the way to full installation of the fastener. The user can then pull the drill and thus device 10 away from the work surface, during which the device will pass through the state shown in FIG. 6, then reaching the state of FIG. 2 as the device loses contact with the work surface. Thus the sequence of fastener installation into device 10, installation of a fastener 34, and retraction from the work surface may happen in multiple repeated cycles without requiring a user to directly manipulate device 10.

(41) FIG. 10 is a section view of a second embodiment of the present invention illustrated generally as 138. Device 138 includes a drive bit 122 having a plurality of radial passages 123 which contain retention balls 20. This approach is in contrast to the first embodiment where the balls were included in ball carrier sleeve (14 in prior figures) which is not contained in the second embodiment illustrated here. Passages 123 are shaped so as to prevent the complete passage of balls 20 fully through and past the inner surface of bit 122. A stack of three trigger balls 128 communicate with radial bore 130 in bit 122.

(42) In this case, a plurality of balls allows for a more sensitive triggering position and reduced longitudinal size of the assembly as compared to using one much larger ball. Trigger balls 128 communicate with trigger shuttle 120 in a similar manner as the first embodiment, however shuttle 120 now includes a central bore 121 for clearance of a mating fastener 134. Compression spring 22 reacts between trigger shuttle 120 and drive bit 122. Spring 124 reacts between an outer cam sleeve 126 and drive bit 122 with assistance from washer 140 and retaining device 142.

(43) The interaction by a user or mechanism to utilize device 138 will utilize similar steps as the operation of device 10 as previously described. In this figure, a nut 132 shown here as a hex nut has been loaded into device 138, which is illustrated in the loaded configuration. Balls 20 are sized such that in the loaded configuration, they will closely approach the shank of fastener 134 which is to be assembled to nut 132. The close proximity of balls 20 and the shank of fastener 134 will assist in aligning said shank with device 138 and thus fastener 132. If the shank of fastener 134 is centered between balls 20, when the distal tip of said shank is engaged with nut 132, the axis of the two fasteners will be largely parallel and coaxial, thus the assembly sequence can proceed rapidly without a concern for cross threading between fasteners 134 and 132.

(44) Fastener 134 is shown protruding through workpieces 100, including a work surface 104 closest to device 138. While not shown, it is assumed that appropriate tools are used to maintain the position and resist rotation of fastener 134 while fastener 132 is installed. During operation of device 138, sleeve 126 will contact work surface 104 and the fastener 132 will be released by balls 20 to allow full and complete installation without direct manipulation of device 138. Device 138 will be automatically configured into an open position after installation of a first fastener 132 by the outer most of trigger detent balls 128 protruding into the internal circumferential groove 144 in sleeve 126. A subsequent fastener 132 can then be loaded without direct manipulation upon device 138 from a user or outside mechanism. Balls 20 float freely and thus will be pushed radially outward by said fastener during loading. Device 138 includes a bore 136 on its proximal end for engagement with a driving device or tool (not shown), bore 136 in this case being illustrated as a square depression though a myriad of engagement methods could be used. Device 138 includes a longitudinal threaded bore 146, which receives a set screw 148, which is used to adjust and limit the rearward extreme position of trigger shuttle 120, thereby allowing device 138 to be adjusted for a fastener 132 that may have a range of lengths, yet still maintaining fastener 132 very close to, or in contact with, balls 20 and the mechanical retaining properties of that arrangement.

(45) An illustrative sequential operation of this second embodiment shown in FIG. 10 could proceed as follows. A user would connect device 138 to a driving tool, perhaps a powered drill with a square socket adapter in the chuck as an illustrative example. The user can then ensure the device is in the proper state to receive a fastener by pressing outer sleeve 126 against their hand perhaps. If not already in a state to receive a fastener, this action will configure device 138 into such a state which is akin to the state of the first embodiment illustrated in FIG. 2. The user, then holding the drill in one hand will load a fastener 132 with a second hand by first aligning fastener 132 with a geometric shape, such as a hex cut into the central bore of device 138. Once aligned, the user can push the fastener, here shown as a nut rearward into the device, perhaps pushing the fastener down into the device with a finger tip.

(46) During this loading sequence, fastener 132 will contact trigger shuttle 120 and push it rearward in device 138, at some rearward position allowing trigger balls 128 to travel radially inward thus allowing stored energy in spring 124 to be released to push sleeve 126 forward relative to drive bit 122. The user may then install a mating fastener, such as bolt 134 through holes in two work pieces 100 and hold that fastener with conventional means such as a box end wrench (not shown). The user could then approach fastener 134 with device 138 which is holding fastener 132 and then turn on the rotation of the drill. Even without precise alignment, balls 20 will serve to align device 138 and fastener 132 with fastener 134 such that the risk of cross threading engagement between fasteners 132 and 134 is greatly reduced.

(47) By proceeding forward with the drill spinning, the threads of fasteners 132 and 134 will engage and thread upon each other, pulling device 138 toward work surface 104. As the front face of sleeve 126 contacts surface 104, further progression of the tool forward while progressing the fasteners together will retract sleeve 126 relative to drive bit 122, thus allowing balls 20 to travel radially outward, removing mechanical obstructions upon fastener 132. Fastener 132 will be drawn fully out of drive bit 122 for a continuous and complete installation of the fastener since the front bore of bit 122 has substantially the geometric profile to accommodate torque transmission to fastener 132 all the way to its front face. After the user installs fastener 132 upon fastener 134, they can retract device 138 away from surface 104 and device 138 will be left in an open state to receive a subsequent fastener 132, without needing to directly manipulate or even contact device 138 in any fashion. The user will simply align and push in another fastener 132 and install it upon a subsequent fastener 134. This cycle can continue in subsequent cycles of loading, installation, and retraction of the tool from the work surface without requiring that the operator directly touch device 138 to directly manipulate any components.

(48) The process of fastener installation and retraction of tool 138 from surface 104 are generally akin to the stages illustrated in FIGS. 5 and 6 for the first embodiment.

(49) A third embodiment of the invention could modify the mechanics of device 138 shown in FIG. 10 to utilize smaller balls 20 thereby reducing the length and diameter of such a device whereby significantly increasing radial clearance between the shank of mating fastener 134 and balls 20. This will reduce somewhat the ability of device 138 to engage and align the two mating fasteners 134 and 132, but the many previously mentioned advantages to the current invention would be retained.

(50) FIG. 11 is a section view of a fourth embodiment for fasteners containing geometric drive depressions, generally illustrated as device 160, which is shown here in an unloaded state. Device 160 includes a fastener 161, a bit holder 162, and a bit insert 164 which will include drive geometry to interface with a fastener such as a cruciform, straight blade, hexagon, hex-lobular, or square drive. Bit insert 164 has a circumferential groove in which a retaining ring 188 will retain the bit insert 164 within bit holder 162 under normal operating conditions, but will also allow removal to change to an alternate bit insert 164. Located within bit holder 162 is a spacer ball 180, intermediate ball 182 and a plurality of trigger balls 184. A compression spring (not shown) will react between bore face 206 and ball 182 to urge ball 182 and subsequently ball 180 and bit insert 164 forward towards the fastener receiving end of device 160. Sleeve 166 contains an internal groove 200 for interacting with trigger balls 184 for controlling the operational states and the triggering of device 160 between those states.

(51) A retaining ring 186 can limit the forward travel of spacer ball 180 and thus retain ball 180 even if bit insert 164 is removed. A spring (not shown) will react between face 196 of sleeve 166 and face 198 of spring retaining sleeve 170 to urge sleeve 166 forward relative to bit holder 162. A third spring (not shown) will react between faces 192 and 194 to urge cam sleeve 168 forward relative to sleeve 166. A plurality of clutch balls 178 are disposed in radial bores in bit holder 162 to control the transmission of torque between bit holder 162 and bit insert 164. In this figure, fastener retention balls 176 are retracted radially outward so a fastener 161 can be loaded without obstruction.

(52) FIG. 12 is a section view of a fourth embodiment illustrated with a fastener containing a geometric drive depression in a loaded state, ready to be installed. Arrows have been superimposed to various bodies to indicate the direction they have moved since being in the state illustrated in FIG. 11, where for purpose of illustration bit 162 is assumed to be the fixed reference frame. By fastener 161 being pushed into device 160, the train of bit insert 164, ball 180, and ball 182, have moved rearward and balls 184 have moved radially inward to clear internal groove 200 and allow sleeve 166 to travel forward, the forward position of which is limited by a set screw 190 contacting shoulder 204 of bit holder 162. Note that the tapered point of set screw 190 allows for adjustment of the forwardmost position of sleeve 166 relative to bit holder 162, which will allow for device 160 to be adjusted to accommodate a range of fastener head geometries (head diameter, shape, thickness etc.) for appropriate fastener holding. With balls 176 then being able to move radially inward, sleeve 168 has caused such movement while being pushed forward by the spring acting on it. Fastener 161 is thus retained by balls 176 and is ready to be installed.

(53) FIG. 13 is a section view of a fourth embodiment with a fastener that has been installed to the point an optional clutch mechanism has disengaged torque transmission to the fastener. Arrows have been superimposed to various bodies to indicate the direction they have moved since being in the state illustrated in FIG. 12, where for purpose of illustration, bit holder 162 is assumed to be the fixed reference frame. It can be seen that adjustable ring 172 is in contact with the face of a workpiece 208 to where sleeve 168 has been retracted to its extreme rearward position relative to sleeve 166 given a stepped diameter inside sleeve 168 contacting the outer collar of sleeve 166, thus allowing balls 176 to be displaced radially outward by fastener 161 and bit holder 162. Sleeve 166 has in turn been retracted rearward relative to bit holder 162 until the point where a plurality of clutch balls 178 are able to move radially outward into internal groove 202 in sleeve 166. At this point, bit insert 164 with a largely hexagonal cross section is able to rotate freely relative to bit holder 162.

(54) This disengagement of torque transmission means serves to control the driving depth of fastener 161 to a desired and repeatable depth. The depth of installation for fastener 161 may be adjusted by moving adjustable ring 172 forward or rearward on sleeve 168. A jam nut 174 is provided for locking the position of ring 172. When device 160 is retracted from workpiece 208, it will be configured so as to receive a subsequent fastener without direct manipulation. Adjustable ring 172 has a circumferential groove 210 for receipt of an optional scratch resistant bumper as discussed previously.

(55) FIGS. 14 and 15 are section views of device 160 illustrating the states shown in FIG. 12 (clutch mechanism transmitting torque) and FIG. 13 (clutch not transmitting torque) respectively. The longitudinal position of sleeve 166 relative to clutch balls 178 will control the transmission of torque between bit holder 162 and bit insert 164. This is due to internal groove 202 allowing clutch balls 178 to travel radially outward to eliminate the obstruction they cause for bit insert 164 which otherwise prevents free relative rotation by engaging with the hexagonal cross section of bit insert 164.

(56) An illustrative sequential operation of the fourth embodiment shown in FIGS. 11 through 15 could proceed as follows. A user will install device 160 into a power drill (not shown) by tightening shank 162 into the drill of said drill. The user can then ensure the device is in the proper state to receive a fastener by pressing the fastener receiving end of device 160 against their hand. If not already in a state to receive a fastener, this action will configure device 160 into such a state, as is shown in FIG. 11. Then, while holding the drill in one hand they will grab a screw 161 with their second hand and twirl screw 161 slightly while screw 161 is applying light pressure upon bit insert 164 in order to align the drive geometry of screw 161 and bit insert 164.

(57) Once the drive geometry is aligned, the user can then push the screw rearward, in turn pushing bit insert 164 rearward and eventually triggering a release of stored energy as has been described previously in multiple embodiments. This release of energy will position sleeve 166 forward, carrying with it retention balls 176 which will then serve to retain the head of screw 161 into device 160 by mechanically obstructing the removal of screw 161 from device 160. The state of screw 161 being captured in device 160 is illustrated in FIG. 12. Screw 161 can then be fully installed into a work piece without any direct contact with or manipulation of device 160 by a user. A unique feature of the fourth embodiment, which is not present in the prior embodiments, is an automatic clutch mechanism which will disengage torque transmission from the drill to the screw to limit the depth at which it is countersunk. Therefore a user is not required to precisely time when they need to stop the drill from spinning.

(58) The process of this clutch disengagement is illustrated in the preceding discussion of FIGS. 12-15. A cross section of device 160, screw 161, and a work surface 208 at the point where the clutch mechanism has disengaged to stop torque transmission from the drill to the screw is illustrated in FIG. 13. At the point the user has driven a screw to the point that the clutch has disengaged torque transmission between the drill and screw 161, they are able to pull device 160 away from work piece 208 and device 160 will be configured to receive a subsequent screw 161 without requiring the user to directly touch or manipulate device 160. The user can then pick up a subsequent screw 161 and twirl it slightly to align the drive geometries of screw 161 and bit insert 164 and then pushing screw 161 rearward into the device such that device 160 will trigger the release of stored energy where components are repositioned to retain screw 161 with mechanical obstruction to prevent unintentional dropping of the screw while installing.

(59) The user can keep the power switch of the drill pressed in until the clutch mechanism within device 160 disengages torque transmission between the drill and screw 161. At that point, they can again pull device 160 away from work piece 208 and load a subsequent screw 161 with this cycle continuing as much as needed.

(60) Further analyzing FIG. 4, while there are benefits achieved by having internal collar 76 pass over the retention balls 20 such that the collar 76 contacts the top center of balls 20 outward radial forces applied to said balls by a fastener do not impart longitudinal positioning force onto sleeve 16, collar 76 need not pass fully past the balls 20 but rather shoulder 78 alone may push on balls 20, perhaps multiplying the force applied by spring 26 through a mechanical advantage of such an orientation would not deviate from the scope and spirit of the present invention. Modifications to the profile of shoulder 78 as illustrated can be made to alter the mechanical advantage realized by the spring to retain fasteners, such as modifying the slope tangent of the profile of shoulder 78 at various points to be disposed at a smaller angle from the tool's central axis. Some of these modifications are illustrated in FIGS. 11 through 13. Note that such modifications can allow for greater variations in fastener geometry to be tolerated while holding a fastener in a specific position at the cost of potentially reduced retention force.

(61) FIGS. 11-13 illustrate adjustability between sleeve 166 and a bit holder 162 utilizing a set screw with a tapered point, but various options could achieve a similar result. As a couple examples, on the figures detailing device 10, adjustment mechanisms could be added to provide adjustability for the forward extreme position of sleeve 14 relative to bit 12, such as internal collar 71 being separate from yet threadably adjustable within the bore of sleeve 14. A resilient member may be disposed between bit 12 and sleeve 14 to provide some urging force would serve a similar purpose.

(62) The present invention can be characterized as a system for advancing a fastener which includes a means for engaging a fastener head and causing the fastener head to be subjected to forces which cause the fastener head to rotate; a means for storing energy by installing a fastener into a workpiece; a means for mechanically obstructing disengagement of the fastener from the means for engaging, by releasing stored energy from said means for storing energy; and a means for interfacing a source of rotary power, so as to provide for an ability to rotate said means for engaging. It should be understood that the means for interfacing a source of rotary power may include an integral clutch mechanism to disengage transmission of rotary power from the source of rotary power to the fastener thereby controlling the driven depth of fastener into the work piece.

(63) As one illustrative example of alternative constructions, the details of the fastener retaining elements are illustrated as spherical elements in the figures of this application, however they could be replaced by elements of other shapes without departing from the scope of the device and method claimed. The pinching fingers discussed above in the fourth category of prior art could be integrated into the device as claimed to replace the ball bearings illustrated in the figures of the present invention without departing from the spirit of the invention.

(64) As an example, elements similar to those labeled 150 and 151 in U.S. Pat. No. 6,244,141 could be integrated into an alternative embodiment of the devices illustrated in the present invention where, for example, these alternative components would be positioned by a sleeve of structure similar to 14 in the detailed description of the present invention and they would be urged radially inward by a cam sleeve of structure similar to 16 in this same description.

(65) Another alternate embodiment could integrate the collet arrangement illustrated in U.S. Pat. No. 6,497,166 into similar structures as said carrier sleeve 14, and urged inward by similar structures as said cam sleeve 16 where 14 and 16 are illustrated in the figures of the present invention.

(66) It is thought that the method and apparatus of the present invention will be understood from the foregoing description, and that it will be apparent that various changes may be made in the form, construct steps, and arrangement of the parts and steps thereof, without departing from the spirit and scope of the invention, or sacrificing all of their material advantages. The form herein described is merely a preferred exemplary embodiment thereof.