Drive-in device

Abstract

The invention relates to a drive-in device, comprising a hand-held housing having a piston element received therein for transmitting energy onto a fastening element to be driven in, an exchangeable propellant charge, a combustion chamber, arranged between the propellant charge and the piston element and extending about a center axis (A), and a control element by means of which a starting position of the piston element can be set to be modified in order to modify the energy transmitted by the propellant charge onto the piston element, the control element having an operating element that can be pivoted about the center axis (A).

Claims

1. A drive-in device comprising a hand-held housing with a piston element received therein for transmitting energy to a fastening element to be driven in, the piston element having a starting position; a propellant charge; a combustion chamber arranged between the propellant charge and the piston element and extending about a center axis (A), and a control element for adjustably changing the starting position of the piston element for changing energy being transmitted by the propellant charge to the piston element, the the control element having an operating element that can pivot about the center axis (A), wherein pivoting the operating element changes the energy being transmitted by the propellant charge to the piston element, and removal of the piston element is reversibly blocked by the operating element, wherein the operating element is coupled via a mechanical forced control to a stop element adjustable in the direction of the center axis (A), wherein the control element comprises a slider track and a slider running in the slider track.

2. The drive-in device according to claim 1, wherein the piston element is movably accommodated in a piston guide such that it is axially displaceable in relation to the hand-held housing of the drive-in device.

3. The drive-in device according to claim 1, wherein the starting position of the piston element is set relative to the piston guide in the course extending the piston guide forward in a drive-in direction.

4. The drive-in device according to claim 1, wherein the operating element comprises an annular sleeve, the sleeve encircling the center axis (A).

5. The drive-in device of claim 1, comprising a locking element blocking the piston element, wherein the locking element can be unlocked only in one of multiple positions of the operating element.

6. The drive-in device of claim 5, wherein the operating element has a recess, the locking element being movable in radial direction when the locking element is covered by the recess.

7. A drive-in device comprising a hand-held housing with a piston element received therein for transmitting energy to a fastening element to be driven in, the piston element having a starting position; a propellant charge; a combustion chamber arranged between the propellant charge and the piston element and extending about a center axis (A), and a control element for adjustably changing the starting position of the piston element for changing energy being transmitted by the propellant charge to the piston element, the the control element having an operating element that can pivot about the center axis (A), wherein pivoting the operating element changes the energy being transmitted by the propellant charge to the piston element, and removal of the piston element is reversibly blocked by the operating element, wherein the piston element is movably accommodated in a piston guide such that it is axially displaceable in relation to the hand-held housing of the drive-in device, wherein a distance (d) between a first stop element acting on the piston guide and a second stop element acting on the piston element can be adjustably set through the control element.

8. The drive-in device as claimed in claim 7, wherein the first and second stop elements act on the piston element and on the piston guide in the same direction.

9. The drive-in device according to claim 7, wherein the starting position of the piston element is set relative to the piston guide in the course extending the piston guide forward in a drive-in direction.

10. The drive-in device according to claim 8, wherein the operating element comprises an annular sleeve, the sleeve encircling the center axis (A).

11. The drive-in device according to claim 7, wherein the operating element comprises an annular sleeve, the sleeve encircling the center axis (A).

12. The drive-in device of claim 7, comprising a locking element blocking the piston element, wherein the locking element can be unlocked only in one of multiple positions of the operating element.

13. The drive-in device of claim 12, wherein the operating element has a recess, the locking element being movable in radial direction when the locking element is covered by the recess.

14. A drive-in device comprising a hand-held housing with a piston element received therein for transmitting energy to a fastening element to be driven in, the piston element having a starting position; a propellant charge; a combustion chamber arranged between the propellant charge and the piston element and extending about a center axis (A), and a control element for adjustably changing the starting position of the piston element for changing energy being transmitted by the propellant charge to the piston element, the the control element having an operating element that can pivot about the center axis (A), wherein pivoting the operating element changes the energy being transmitted by the propellant charge to the piston element, and removal of the piston element is reversibly blocked by the operating element, wherein the piston element is movably accommodated in a piston guide such that it is axially displaceable in relation to the hand-held housing of the drive-in device, wherein the starting position of the piston element is set relative to the piston guide in the course extending the piston guide forward in a drive-in direction.

15. The drive-in device according to claim 14, wherein the operating element comprises an annular sleeve, the sleeve encircling the center axis (A).

16. The drive-in device as claimed in claim 15, wherein the sleeve is held in at least one defined position by a catch element.

17. The drive-in device as claimed in claim 14, comprising a locking element blocking the piston element, wherein the locking element can be unlocked only in one of multiple positions of the operating element.

18. The drive-in device as claimed in claim 17, wherein the operating element has a recess, the locking element being movable in radial direction when the locking element is covered by the recess.

19. The drive-in device according to claim 17, wherein the operating element comprises an annular sleeve, the sleeve encircling the center axis (A).

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING(S)

(1) FIG. 1 Perspective full view of a drive-in device according to the invention

(2) FIG. 2 Perspective detailed view of a drive-in device shown in FIG. 1

(3) FIG. 3 A further perspective detailed view of a drive-in device shown in FIG. 1 with an operating element in a servicing position

(4) FIG. 4 A different perspective detailed view of a drive-in device shown in FIG. 1 with an operating element in maximum drive-in energy setting, an external covering of the operating element having been omitted

(5) FIG. 5 A partial cutaway view through the drive-in-device shown in FIG. 1 in maximum drive-in energy setting

(6) FIG. 6 The cutaway view from FIG. 5 at minimum drive-in energy setting

(7) FIG. 7 The cutaway view from FIG. 5 with the operating element in a servicing position with a released locking element and removed piston element

(8) FIG. 8 A perspective detailed view of a further exemplary embodiment of the invention

(9) FIG. 9 The exemplary embodiment from FIG. 8 with an operating element in a servicing position

DETAILED DESCRIPTION OF THE INVENTION

(10) A drive-in device according to the invention comprises a hand-held housing 1 in which a piston element in the form a piston 2 is accommodated. A surface 2a of the piston 2 defines a combustion chamber 3 in which the combustion gases of a pyrotechnic charge expand for the purpose of accelerating the piston 2.

(11) The piston 2 acted on in this manner by kinetic energy strikes a tappet at the end of a fastening element (not shown), which is thereby driven into a workpiece.

(12) In this example, the charge is accommodated in a sheet metal cartridge. The cartridge has a piercing fuse and, prior to ignition, is inserted into a cartridge holder 4 via an appropriate loading mechanism. The cartridge and the cartridge holder 4 are realized rotationally symmetrically about a center axis A. In the present examples, the center axis A is at the same time a center axis of the combustion chamber 3 and the piston element 2.

(13) The combustion chamber 3 is arranged between a circular opening 4a of the cartridge holder 4 and the surface 2a of the piston 2. In this case a depression 2b is realized in the piston 2, which contributes to better swirling of the combustion gases and constitutes part of the defining of the combustion chamber 3.

(14) The combustion chamber 3 with the cartridge holder 4 is part of a piston guide 5. The piston guide 5 is a component that can be displaced linearly along the axis in the housing 1 of the drive-in device. The piston element 2 for its part can be displaced linearly along the central axis A in the piston guide 5.

(15) In its front area, the piston guide is shaped essentially as a hollow cylindrical element, a slit 6 being provided in the wall of the piston guide 5 starting from the end of the combustion chamber 3 area.

(16) A front end of the piston guide 5 is releasably attached to a receiver for the fastening means (not shown). This receiver can be realized as a different module according to use. The receiver can be connected to the piston guide via a clamp, which engages a recess 7 at a front end of the piston guide 5.

(17) A first stop element 8 protrudes into the slit 6 in radial direction. The stop element 8 functions, on one hand, as a front stop for the piston element 2 in the course of manual piston resetting or a two-stage repeater motion. On the other hand, the stop element 8 functions as a locking element, the removal of the piston element 2 and piston guide 5 being prevented when the locking element is in closed state.

(18) A second stop element 9 protrudes likewise in radial direction from the housing 1 inward, a beveling 5a acting together with the second stop element 9 as a stop on the piston guide. The second stop element 9 also functions at the same time as a releasable locking element, which, in closed state, prevents the piston guide 5 from being removed from the housing 1.

(19) A manual piston return design as presented here makes it possible for stop elements to have a dual function, allowing them to also serve as releasable locking elements for device disassembly. In other drive-in device designs these functions can also each be provided by different components.

(20) The distance d between the stop elements 8,9 can be adjustably changed by means of an operating element 10, where the starting position of the piston element 2 relative to the piston guide 5 or combustion chamber 3 can be changed by adjusting the size of the distance d.

(21) Furthermore, when the operating element 10 is in a servicing position, the stop elements 8,9 can be released for a radial movement outward and thus an unlocking, whereas they are locked in radial direction in other positions of the operating element 10. For this purpose, the operating element 10 also has recesses 10a, 10b in which the locking elements or stop elements 8,9 engage when the operating element 10 is in the appropriate position. This can be illustrated by comparing the servicing position in FIG. 7 with a normal operating position in FIG. 5 or FIG. 6.

(22) The operating element 10 is realized in this case as a rotatable, annular sleeve, which is arranged in essence concentrically around the center axis A in a forward area of the housing 1 of the drive-in device.

(23) A slide track 11 is molded in the sleeve 10. A slider 12 is mounted such that it is movable only in axial direction and engages the slide track 11 from below by means of a stud 12a. Pivoting or, in this case, rotating the sleeve 10 about the center axis A changes the axial position of the slider in a positively driven manner.

(24) The second stop element 9 is connected to the slider 12 and is shifted correspondingly with the slider in axial direction. The slider track 11 and the slider 12 thus collectively constitute a mechanical forced control for axial displacement of the stop element 9.

(25) The stop elements 8,9 collectively form with the operating element 10 and the forced control 11, 12 a control element for changing the starting position of the piston element 2, thereby facilitating an adjustable reduction of the drive-in energy of the piston element compared to a maximal rear starting position of the piston element in the combustion chamber 3. This adjustment proceeds as follows:

(26) Following an energy action, the piston element is located in a partly undefined, yet primarily forward-shifted position. The piston guide 5 is in a maximally rearward-shifted position in the drive-in device. In this document, the terms forward and rearward are always in relation to the to the drive-in direction.

(27) Thereafter, in preparation for the next energy action, the desired drive-in energy is adjusted as energy level labeled on the operating element by rotating the sleeve 10. This leads to a selected axial positioning of the second stop element 9 by means of the forced control described above. In this exemplary embodiment, the first stop element 8 cannot be adjusted in axial direction.

(28) Subsequently, the piston guide is extended forward out of the housing as the first stage of a repeater motion. In this process the piston element 2 is moved along until it strikes the first stop element 8. From this point in time, the piston guide is also moved relative to the piston element 2 until it strikes the second stop element 9 in the same stop direction. The setting of distance d carried out prior now provides a defined prescribed (or also the maximum pushed back) starting position of the piston element 2 in the combustion chamber 3.

(29) The piston guide 5 is then inserted back into the device in the opposite direction until reaching a starting position for the next drive-in action. During this second stage of the repeater motion, the piston element is no longer moved relative to the piston guide. By means of a further, in principle already known, mechanism, a propellant charge is introduced into the cartridge holder 4 and the device is ready for the next drive-in action.

(30) Irrespective of this defining of the starting position of the piston element, a further function can additionally be provided by the operating element 10. In this case it involves the servicing position of the sleeve 10 shown in FIG. 3 and FIG. 7. In this servicing position, piston element 2 and piston guide 5 can be removed from the housing 1 for checking, replacing or cleaning parts.

(31) For this purpose, the sleeve-shaped operating element 10 has the first recess 10a, which is shaped as a through hole and the second recess 10b, which is realized as a hollow space. A ramp can be attached laterally to the hollow space, thereby allowing the second stop element 9 to be pressed radially inward again following assembly.

(32) In the corresponding servicing setting, the stop elements or locking elements 8, 9 are no longer prevented from moving radially, but rather can be pressed radially outward through bevelings in the course of piston element 2 and piston guide 5 being pulled out (see FIG. 3, FIG. 7). The locking elements 8, 9 are unlocked in these positions.

(33) The second locking element 9 is further secured from falling out by the sleeve 10. The first locking element 9 exerts a greater stroke in radial direction and is secured by an open spring washer 13 which clamps down on a slit 8a in the locking element 8.

(34) In the second exemplary embodiment shown in FIG. 8, provided on the operating element 10 realized as a sleeve is a locking element 14 by means of which the sleeve 10 is held in a locking manner in various defined rotational positions. Overcoming the locking force allows the sleeve to be adjusted out of these positions.

(35) As a catch mechanism, the locking member has a flexible tongue 15, which engages, by means of a projection, a marginal detent plate 16 on the sleeve 10. The spring force of the flexible tongue 15 acts in axial direction in this case.

(36) In another embodiment not illustrated, a radially acting catch spring can also engage a radially oriented detent plate of the sleeve 10. Such catch mechanisms are known, for example, in sleeves for adjusting torque on drills.

(37) The variant shown in FIG. 8 and FIG. 9 constitutes a simplified version that envisions no adjustment of drive-in energy. The sleeve therefore has only two catch positions, namely a servicing position (FIG. 9) and an operating position (FIG. 8). In the servicing position as shown in FIG. 9, the released locking element 8 is shoved radially outward analogous to the first example in FIG. 3. This occurs in the course of piston element 2 and piston guide 5 being removed through the interaction of the components with the locking element 8 via the particular beveled surfaces 5a.

(38) In an embodiment according to the invention, provided beneath the rotatable sleeve 10 as operating element as in the first exemplary embodiment is a slide track 11 and a slider 12, by means of which the second stop element 9 is adjusted in axial direction. Accordingly, a variant according to the invention expediently has further catch positions, which can correspond to, in particular, discrete, pre-selectable energy settings.