Fence post driving apparatus

Abstract

A non-impact fence post driver attachable to a front end loader or similar mobile machine for operation has a hydraulic driven sleeve assembly suspended from a U-joint so as to vertically self-align from the loader, and has a fence post holding shell assembly attached to the sleeve with retractable gate hinged locking assembly to hold the fence post securely near the bottom while driving the post.

Claims

1. An apparatus for driving fence posts into the ground and that is attachable to mobile means having a direction of travel and having a connectable power source for providing power to attachments to the mobile means, said mobile means having a front end and a rear end together aligned with the direction of travel, and two sides between the front end and rear end, said apparatus comprised of: a. rigid extension support member releasably attachable to the mobile means and having a first end and a second opposing end, said first end connected to said mobile means; b. fence post securing assembly suspended from the rigid extension support member for driving a fence post in a vertically self aligning manner, having a moveable drive sleeve, said drive sleeve having fence post latching means attachable thereto for securing a fence post to the moveable drive sleeve; c. nonimpact driving force means powered by said power source and having a fixed portion being fixed relative to the rigid extension support member, and a moving force element responsive to the power source, for driving the fence post secured to the moveable drive sleeve; d. rotation adjustment means between the fence post securing assembly and the rigid extension support member for rotating the fence post securing assembly so as to provide adjustment of the rotational direction of the fence post when a fence post is secured to the moveable drive sleeve.

2. The apparatus in claim 1 having means for automatically stopping the moving force element of the nonimpact driving force means when the post has been inserted to a predetermined level.

3. The apparatus in claim 1 or 2 wherein the nonimpact driving force means is a hydraulic driving force having moveable ram means responsive to the hydraulic power, and wherein the fence post securing assembly is comprised of an elongated internal rigid tube and an external elongated rigid moveable drive sleeve slidably connected to the rigid tube so as to allow vertical movement of the drive sleeve about the rigid tube engaged within the moveable drive sleeve in response to movement of the ram means.

4. An apparatus for driving fence posts that is attachable to a loader, said loader having a direction of travel and having a bucket and a connectable hydraulic power source means for providing power to attachments to the loader, said loader having a front end and a rear end together aligned with the direction of travel, and two sides between the front end and rear end, said apparatus comprised of: a. rigid extension support member releasably attachable to the bucket and having a first end and a second opposing end, said first end releasably attachable to the bucket; b. fence post securing assembly gravitationally suspended from the rigid extension support member for releasably securing a fence post, so as to allow for gravitationally guided vertical alignment of the fence post securing assembly and said fence post securing assembly having a moveable drive sleeve, said drive sleeve having fence post latching means for securing a fence post to the moveable drive sleeve; c. nonimpact driving force means powered by the hydraulic power source means and having a fixed portion being an encasement that is fixed relative to the rigid extension support member, and a moving force element comprising ram means moving in response to the hydraulic power source means, said ram means attached to the moveable drive sleeve, for driving a fence post essentially vertically into the ground in response to the hydraulic power source means; d. stop means for automatically stopping the moving force element when the fence post has been driven into the ground to a predetermined level; e. rotation adjustment means between the fence post securing assembly and the rigid extension support member for rotating the fence post securing assembly so as to provide adjustment of the rotational position of the fence post when a fence post is secured to the moveable drive sleeve.

5. The apparatus in claim 1, 2, or 4, wherein the fence post securing assembly is suspended towards a side of the mobile means such that the mobile means can travel essentially parallel to an intended fence line to enable repeated successive post placement without backing up, and wherein the moving force element is driven downward from an essentially fixed point relative to the ground where the fence post is inserted, and wherein the moveable drive sleeve driven by the moving force element has single action fence post latching means connected to the moveable drive sleeve so as to allow releasing of the latching of the fence post to the fence post securing assembly in one simultaneous movement of the latch means.

6. The apparatus in claim 1, 2, or 4 wherein the fence post securing assembly is suspended towards either side of the mobile means such that the mobile means can travel essentially parallel to an intended fence line to enable repeated successive post placement without backing up, and wherein the moving force element is driven downward from an essentially fixed point relative to the ground where the fence post is inserted, and wherein the drive sleeve driven by the moving force element has single action fence latching means connected thereto so as to allow retaining or releasing of the fence post to the fence post securing assembly in one simultaneous movement of the latch means using latching gate means hingedly attached to said drive sleeve and wherein said latching gate means has self locking means for releasably securing the post in a self-locking manner that resists any further movement of the gate in any direction once the gate means is moved past a predetermined position.

7. The apparatus in claim 1, 2, or 4 wherein the fence post securing assembly is comprised of a drive sleeve and rigid tube, wherein the drive sleeve is connected to the moving force element and is slidably connected to the rigid tube such that the drive sleeve slides downward towards the ground with respect to the rigid tube in response to movement of the moving force element when driving the fence post, and such that the drive sleeve has attached to it fence post securing means for releasably securing the fence post to the drive sleeve.

8. The apparatus in claim 1, 2, or 4 wherein the fence post securing assembly is comprised of a drive sleeve and rigid tube, wherein the drive sleeve is connected to the moving force element and is slidably connected to the rigid tube such that the drive sleeve slides downward with respect to the rigid tube in response to movement of the moving force element when driving the fence post, and such that the drive sleeve has attached to it fence post securing means comprised of a rigid elongated member having latching gate means hingedly attached thereto for releasably securing the post thereto with a single movement of the fence post securing means.

9. The apparatus in claim 1, 2, or 4 wherein the fence post securing assembly is comprised of a drive sleeve and rigid tube, wherein the drive sleeve is connected to the moving force element and is slidably connected to the rigid tube such that the drive sleeve slides downward with respect to the rigid tube in response to movement of the moving force element when driving the fence post, and such that the drive sleeve has attached to it fence post latching means comprised of a rigid elongated member having gate means hingedly attached thereto for releasably securing the post thereto with one movement of the gate means, and wherein the gate has self-locking means to resist movement of the gate when the gate is moved past a predetermined position to retain the fence post.

10. The apparatus in claim 1, 2, or 4 wherein the fence post securing assembly is comprised of a drive sleeve and rigid tube, wherein the drive sleeve is connected to the moving force element and is slidably connected to the rigid tube such that the drive sleeve slides downward with respect to the slide tube in response to movement of the moving force element when driving the fence post, and such that the drive sleeve has releasably attached to it a removable shell assembly comprised of a rigid shell member releasably engageable with the moveable drive sleeve, and releasable fence post latching means attached to the releasably engageable rigid shell member.

11. The apparatus in claim 1, 2, or 4 wherein the fence post securing assembly is comprised of a drive sleeve and tube, wherein the drive sleeve is connected to the moving force element and is slidably connected to the rigid tube such that the drive sleeve slides downward with respect to the rigid tube in response to movement of the moving forcing element when driving the fence post, and such that the drive sleeve has attached to it a removable shell assembly having a rigid shell member and having fence post latching means attached to the rigid shell member, and wherein the fence post securing assembly has rotation locking means for releasably locking the fence post securing assembly in place to a desired rotational position.

12. The apparatus in claim 1, 2, or 4 wherein the moving force element is driven by hydraulic pressure and wherein the fence post securing assembly is comprised of a drive sleeve and rigid tube, wherein the drive sleeve is connected to the moving force element and is slidably connected to the rigid tube such that the drive sleeve slides downward with respect to the rigid tube in response to movement of the moving force element when driving the fence post, and such that the drive sleeve has attached to it a removable shell assembly comprised of a rigid shell member and having fence post latching means attached to the rigid shell member, and where the fence post securing assembly has rotation locking means for releasably locking the fence post securing assembly in place to a desired rotational position, and wherein the moving force element is driven downward from an essentially fixed point relative to the ground where the fence post is inserted, and having hydraulic pressure release means to automatically release the hydraulic pressure to a nominal amount when a fence post is driven into the ground to a predetermined level so as to allow safe disengaging of the fence post latching means.

13. The apparatus in claim 1, 2 or 4 or wherein the moving force element is driven by hydraulic pressure and wherein the fence post securing assembly is comprised of a drive sleeve and rigid tube, wherein the drive sleeve is connected to the moving force element and is slidably connected to the rigid tube such that the drive sleeve slides downward with respect to the rigid tube in response to movement of the moving force element when driving the fence post, and such that the drive sleeve has attached to it a removable shell assembly comprised of a rigid shell member and having fence post latching means attached to the rigid shell member, and where the fence post securing assembly has rotation locking means for releasably locking the fence post securing assembly in place to a desired rotational position, wherein the moving force element is driven downward from an essentially fixed point relative to the ground where the fence post is inserted, and having pressure release means to release the hydraulic pressure to a nominal amount to allow safe disconnect of the attachment from the fence post where the pressure release means is comprised of a hydraulic bypass valve in combination with a hydraulic float valve to allow equalizing hydraulic forces to transition when a fence post is driven to a predetermined level.

14. The apparatus in claim 1, 2, or 4 wherein the fence post securing assembly is comprised of a drive sleeve and rigid tube, wherein the drive sleeve is connected to the moving force element and is slidably connected to the rigid tube such that the drive sleeve slides downward with respect to the rigid tube in response to movement of the moving force element when driving the fence post, and such that the drive sleeve has attached to it a removable shell assembly comprised of a rigid shell member and having fence post latching means attached to the rigid shell member, and wherein the fence post securing assembly has rotation locking means for releasably locking the fence post securing assembly in place to a desired rotational position, and said apparatus further having height guide means for inserting the post in the fence post securing means so as to achieve a uniform height of fence posts.

15. The apparatus in claim 1, 2, or 4 wherein the fence post securing assembly is comprised of a drive sleeve and rigid tube, wherein the drive sleeve is connected to the moving force element and is slidably connected to the rigid tube such that the drive sleeve slides downward with respect to the rigid tube in response to movement of the moving force means when driving the fence post, and such that the drive sleeve has attached to it a removable shell assembly comprised of a rigid shell member attached to the drive sleeve, and releasable fence post latching means attached to the rigid shell member, and where the driving force on the fence post from the moving force element is in the lower half of the fence post.

16. The apparatus in claim 1, 2 or 4 wherein the fence post latching means for retaining and releasing the fence posts has self locking means for locking the latching means in place upon sufficient movement of the latching means wherein, the self locking means is comprised of toggle past center locking means.

17. The apparatus in claim 1, 2 or 4 having fence post latching means having open and closed positions for releasably securing the fence post to the moveable drive sleeve, said latching means comprised of a rigid holding bar pivotally engaged with a series of rigid links pivotally interconnected, wherein the series of links has a first end connected to the holding bar and an opposing end connected to a rigid latch hingedly connected to the holding bar, and defining two positions of links for an open and one for a closed position, and wherein at least one link has link stop means adjacent to it for resisting further movement of the links to either open or closed positions once the holding bar moves past a predetermined position.

18. The apparatus in claim 1, 2 or 4 having latching means for releasably securing the fence post to the fence post securing assembly, said latching means comprised of a rigid holding bar, two sets of rigid pivotally connected links, each set spaced apart, and wherein said two sets are operationally interconnected such that operating one set operates the other, and wherein each set has a first end and a second end, wherein the first end has a latch hingedly connected to the holding bar, and the second end is attached to the holding bar.

Description

DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is an overall perspective of the invention.

(2) FIG. 2 is a view upper portion of the invention, including the U-joint and rotation yoke

(3) FIG. 3 is a view of the hydraulic assembly with the drive sleeve

(4) FIG. 4 is a view of the shell assembly from above

(5) FIG. 5 is a view lower part of the device with a post latched in place

(6) FIG. 6a is a close up view of the device with the gate open at the lower section

(7) FIG. 6b is a close up view with post in place and latch gate closed

(8) FIG. 7 is a close up view of the latching mechanism looking down

(9) FIG. 8 is a close up view of the upper latch assembly

(10) FIG. 9 is a close up view of the top stop assembly

(11) FIG. 10 is a close-up view of the hydraulics

(12) FIG. 11a is a close view of the reverse shell in use

(13) FIG. 11b is a close up view of the reverse shell with latch assembly in use, from above

(14) FIG. 12 is a front view of the loader with bucket showing how the invention is attached to the bucket

(15) FIG. 13 is a schematic of the hydraulics in the described mode

SUMMARY OF THE INVENTION

(16) The invention is a non-impact continuous force fence post driver attachable to a front end loader or similar mobile machine for operation. In the preferred mode it utilizes the hydraulics of the front end loader and has a hydraulic driven sleeve assembly suspended from a U-joint so as to vertically self-align from an extension support member attached to the front end loader. A fence post holding shell assembly attached to the sleeve has retractable hinge locking assembly to hold the fence post securely near the bottom while driving the post.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

(17) The invention is shown in FIG. 1 in the preferred mode attached to a loader bucket, although it can be suspended from any excavation machinery with hydraulic or other connectable power means for powering an attachment means. It is also any suspension means including a mobile machinery or standalone frame with means for suspending an attachment and having a connectable power source or access to a connectable power source (such as hydraulic power source) to power the attachment. For purposes of this disclosure, loader will refer to all of the foregoing, as will the term suspension means. In the preferred mode disclosed herein, the suspension means is a loader with bucket attachment having attachment means for other attachments to attach to the bucket. Power means refers in the preferred mode to the connectable hydraulic system of the loader that can drive an attachment, where the necessary auxiliary hydraulic lines can be accessed and connected to with minor adjustments.

(18) While some buckets are known to be used to themselves force a post downward from the top, this invention has the bucket remaining at an essentially fixed point to allow the objectives of driving the post in a truer vertical motion and from the lower end of the fence post rather than the top, so there are no bending forces applied to the post.

(19) It has several principal portions described that in the preferred mode suspends from offset beam 31 via a universal joint 3. Fence post securing means that releasably secure the fence post during driving are shown suspended from the beam using the universal joint to achieve a natural self alignment via gravitational force on the suspended attachment. The hydraulic drive assembly has ram means 45 driven by cylinder 49 in response to the hydraulic pressure, attached to drive sleeve 17 via drive sleeve lug19. Shell assembly 28 is attached to the drive sleeve 17 as discussed further herein with reference to FIG. 3. Shell assembly 28 is shown as removable and has shell 29 that encompasses the sleeve 17 as will be discussed. The sleeve has slide tube 11 slideably attached therein so as to allow the sleeve, and thus entire shell assembly with post secured thereto, to slide up and down the slide tube as the hydraulic ram 45 moves up and down in accordance with the hydraulic force on the ram. Fence post securing means, shown here having upper securing means 61 and lower securing means 62, are fixed to the shell assembly 28. In this mode, the post is secured at upper post locking assembly 61 and at lower locking assembly 62, which are operated in conjunction utilizing retractable and hingeably connected operating handle 30 connected to both. These each will be discussed in more detail.

(20) The drive stick 58 is attached to the hydraulic system via U-joint 54, and has its free motion limited by retaining lop 55. The drive stick provides the control for driving the hydraulic ram up and down. Pressure is released at the desired time via float valve control 33, with extension 35.

(21) Removable GPS rigid antenna arm mount 14 allows for GPS attachment arm 41 (to which is attached the GPS antenna 40) although such mount means could be placed in other places in other ways. GPS antenna means 40 allows precise location of the post and more precision in line, and for legal boundary compliance as needed, or other desired location criteria. Consequently, the placement of the GPS positioning device should be placed in a known point in relation to where the fence post is being driven, if it is not placed directly above the fence post.

(22) FIG. 2 shows the suspension U-joint 3 attached to offset beam 31 via extension 10 having center rigid pin means 4 to allow rotational movement about one direction, and center transverse rigid pin means 5 to allow movement in a transverse direction 90 degrees rotated. Pin locking means 8 allows removal of the entire assembly when not in use or for maintenance.

(23) The entire unit is thus suspended so as to allow it to self-align vertically, plumb to the ground. This allows the device to be vertical and allows more importantly the post driving means to be and remain essentially vertical during the entire drive process. Thus, there is a fixed vertical point during the driving process where it is suspended and the bucket to which it is attached doesn't move. If the bucket were to provide the downward force, as some prior art suggests, a downward arc is created as the point of connection moves with the bucket, thus the post is not driven truly vertical into the ground. In this invention there is no moving point with relation to the bucket.

(24) The entire device may be rotated to adjust the position of the fence post as needed to allow the fence post teeth to all face the desired direction. Rotation sector/yoke 7 is rotatably connected to pin 12, and locked in place using rotation selector pin 13 interconnecting with rigid teeth on rigid sprocket 9. Rotation selector 13 is a tension loaded pin, here shown as spring loaded with selector spring 15, which when pulled down with control handle 16 and spring loaded release cable 21, allows the rotation of the device. Thus the U-joint 3 has rigid rotation yoke with sprocket 9 having a face opposing the rigid planar face 10 of the device attached to slide tube 11, and allows for the rotation of the entire device in relation to adjacent sprocket 9 and hydraulic cylinder assembly 47 is removably attached via cylinder handle mount pin 25. Although only one pin 13 is shown, more pins are allowable. Additional pins placed in offsets (rather than in equidistant locations matching the sprocket teeth separation) allow for more precise rotational movements as desired. Drive sleeve 17 slides about slide tube 11 and has shell mount collar 20 to receive the top of the removable shell assembly 28.

(25) FIG. 3 shows the drive sleeve assembly having a drive sleeve 17 in the up position, thus the slide tube 11 about which it slides is inside and not shown. The hydraulic cylinder provides the force for driving the drive sleeve 11 in an essentially vertical direction, although other force means such as pneumatic means are envisioned. The drive sleeve will receive the shell 29 shown in FIG. 4, which shell is removably attachable to the drive sleeve and held in place in two places in this mode, at the top of the drive sleeve where the top of the shell 29 slides under the shell mount collar 20, and at the bottom of the drive sleeve at holes 60 which align with holes in assembly lugs 51 in shell 29 in FIG. 4, through which removable pin 51a is inserted and secured. Hydraulic drive assembly 47 is shown with typical hydraulic cylinder 49 with cylinder ram 45 releasably connected to the drive sleeve 17 at drive sleeve lug mounts 19a and 19b via cylinder ram pin 48. Drive sleeve mounts are rigidly connected to the drive sleeve. Hydraulic hoses 200a and 200b feed the hydraulic fluid to and from the hydraulic cylinder 49. Control handle 16 is secured to the cylinder 49 with clamp 44 with rigid spacer 32 therebetween to comprise a hydraulic assembly 47. Shell pin holes correspond to shell assembly lugs to releasably secure the shell assembly 28. Rotation cable release 21 is shown attached so as to allow extended control of the rotation by the operator.

(26) FIG. 4 shows the shell assembly 28, which is removably attached to the drive sleeve 17. An alternative shell assembly is shown elsewhere herein as essentially a reverse shell, used where setting posts from the opposite side is desired or needed. Thus drive sleeve 17 accepts changeable shell assemblies.

(27) It should be noted that the shell assembly, although removable, is not required to be removable for the invention. The shell assembly and/or its parts can be affixed directly to the drive sleeve.

(28) In the preferred mode, the top 29b of the shell 29 fits relatively snugly in the shell mount collar 20 in FIG. 2 and FIG. 3, and the bottom is attached via mount lugs 51 shown in FIG. 4. Ground foot 70 is a planar rigid member that meets the ground when in use. Although shown as planar, it can be any means for sensing when the post has entered the ground at the required depth sufficient to stop further driving. It is also a visual means for where the post will be at ground level when inserting the post into the device. As a planar rigid member, it provides the means for stopping the downward movement of the hydraulic ram when it meets the ground in that it causes increased force and more pressure on the hydraulics so as to activate the release valve when the hydraulic pressure reaches a certain predetermined pressure, discussed more hereafter. Top stop bar 130 is part of the guide assembly with top stop safety means, and is slidably attached in shell ring 131a fixed to the shell 29 and is adjustable up and down via adjust eye bolt 153a. Post size adjustment screw 88 allows for different size posts.

(29) The upper latch means 61 in FIG. 1 is shown in more detail here in FIG. 4. It has upper latch gate 113 that is hingedly connected to the shell 29 and driven by a series of rigid link members 114, 117 (comprised in the preferred mode of link pair 117a and 117b) and 119 (comprised of link pair 119a and 119b). In the preferred mode, link 114 at one end is sandwiched between one end of the link pair 117 at 116, and the other end of the link pair 117 is sandwiched between link pair 119a and 119b at 118. Link 122 is fixed to the shell 29. The links and handle 30 are connected as shown in the preferred mode so as to grip and secure the post when the handle 30 is brought into place, and actually lock the post into place in a self-locking (latching) manner. Upper latch gate 113 is shaped as shown, having a first approximately 90 degree bend in the preferred mode, although any bend is envisioned to function to hold the post. It has a second bend in the opposite direction, and is hingedly connected at 129 to the shell 29. Rigid upper drive latch 114 is connected to gate 113 to the first bend as shown so as to drive the gate as shown, although any means to drive the gate is envisioned. Upper drive link 117 is affixed to the upper handle 110 and has a first end with holes that correspondingly are hingedly connected at 116 to link 114 (which link 114 has a corresponding hole at its end opposite 115) and at a second opposing end 118 to intermediary links 119a and 119b. Link 119b is attached to synchronizing tube 53.

(30) The other end of link pair 119 connects to link 122 at 121 via elongated slotted hole 121a in link 122 that works in conjunction with the lower locking mechanism to assist in providing the self-locking feature. The upper and lower linkage toggles over center and locks the post in place when properly adjusted to fit the selected post. This self-locking is achieved via the hinged (pivotal) connections at 116, 118, 121 in combination with the upper arm bar 110 being connected to the upper drive link pair 117. By driving link pair 117 forward against member 114, the gate 113 is hingedly rotated at 129 and secures the post (not shown, but held in place at the interior 113a) against the post mount bar 68 (FIG. 8) at the side of the shell 29 at 29a. Link pair 119 hinges and slides its furthest hinge connection 121 at the opposite end in the slotted hole 121a, and acting together brings the assembly into a locked position when the gate 113 is brought sufficiently forward past a toggle point. Moving the link pair 119 in the slot 121a changes the direction of force of link pair 119 so as to force the other links to remain in place. Self-locking here refers to means for holding the bar in place once the operator takes his hands off the handle 30, in this case without the operator even engaging a separate locking means, and is done here simply by moving the handle far enough such that the force of the links keeps the handle in the locked (latched) position. It is also commonly known as toggle past center latching, where once the locking mechanism reaches at or near a center point in motion, it tends to toggle back and stay in place. The apparatus for this toggle past center feature is new.

(31) The links and related members that they are attached or linked to just described comprise the upper locking means 61. This similar self-locking means, as will be shown, occurs in the lower locking means 62 simultaneously via synchronizing tube 53 operating together with the handle 30, upper operating arm 110 and lower operating arm 91.

(32) FIG. 5 shows this lower locking mechanism 62 and the lower portion of the shell assembly 28. The drive ram 45 attached to and driving the lower end of the shell 29 at 48 provides one key to this invention, i.e. driving the post near the bottom half of the post, in this case near the bottom.

(33) The lower securing (locking) means 62 has a linkage of links similar in function to the upper securing means 61. Lower arm bar 91 has lower drive link 78 attached at a first end. Link 78 has at its first end an upper and lower portion, 83a and 83b respectively spaced apart and both hingedly connected with pin through holes at 82 to lower drive lug link 90 between them (which lug link is attached to lower latch gate 85) so as to allow the end 78 to drive the lower latch gate 85 against the post 2 via hinged connection 82. Lower latch gate 85 is hinged to the shell 29 via hinge means 73 and pin 74.

(34) The opposing second end of lower drive link 78 similarly has upper portion and lower portion 81a and 81b respectively, spaced apart. That space, in this mode, allows for link 76 to move in between during gate opening. Upper portion 81a is hingedly connected at 84 to lower intermediary link 79a at its first end via holes and pin at 84. Link 79a is attached to the synchronizing tube 53 and thus moves in conjunction with its counterpart upper intermediary link 119b in FIG. 4 via said tube 53. Spaced apart from link 79a and corresponding thereto as shown, is link 79b, having holes at its respective first and second ends at 84 and 35 to allow a common pin to penetrate all holes at 84 such that link 79a and link 79b, at 84, hingedly (pivotally) connect to operate together in hinged relation to ends 81a and 81b.

(35) The opposing ends 77a and 77b of intermediary link 79a and 79b is hingedly connected via pin 35, together, to shell lower lug link 76 there between, at the lug link's first end. In this mode, there is not needed, nor shown, a slotted hole in link 76 at 35. Link 76 is essentially, in this mode, an L shaped rigid member hingedly attached at its second end via pin 86 to bracket 89 that is attached to the shell 29. An adjustment bolt 88 screwing through the bracket 89 has its end touching the lug 76 such that rotation of the bolt 88 tightens or loosens at 88a, thus restricting the movement of said L shaped rigid member at that side, forcing or allowing lug 76 in or out, to allow more or less movement in lug 76. Bolt 88 is locked in place with locking nut 87. Thus the mechanism is allowed greater or lesser movement during self-latching which allows for means for adjusting for various post sizes to be latched or locked in by the upper and lower gates.

(36) It should be noted that unless otherwise indicated, hinged connections also includes pivotal connections for purposes of this invention.

(37) The post 2 is set and locked in place up against the lower post mount bar 75 that is attached to the shell 29. The edge of the post 2 fits in notch 93. Angle edge 71 of ground foot 70 allows for easier retraction of the device away from the driven post once the post is inserted and the latch is released.

(38) FIG. 6a shows a closer view of the bottom portion of the shell assembly in an open position. Post contour notches 63, in conjunction with notch 93, help secure the fence post when lower latch gate 85 is closed so as to allow the post to be secured firmly during driving, particularly at this lower area. Drive lug 56 from lower latch gate 85 fits between the post teeth to provide further stability in this regard. It is from this lower area that the post is driven by the hydraulic drive means, an object of the invention. By driving from the bottom half or below (of the post) no bending moment is created that would otherwise tend to bend the post while undergoing the significant forces present during driving of the post.

(39) FIG. 6b is a close up similar to 6a but in the closed position. Fence post foot blade 59 can be seen as can the fence teeth 57. Gate 85 locks the post into place with drive lug extension 56 fitting between the post teeth.

(40) FIG. 7 shows the height guide looking down on it. Post guide mount bracket 104 slides within post mount bar 75. Post mount bar 75 has a hollow interior for that purpose. Eye bolt 103 extends to the interior of the post mount bar 75 to hold the bracket in the desired position so as to have the spring-loaded guide shoe 96 fit between the teeth at the desired location on the post 2. Height guide arm 104 has spring loaded (via spring 101). The lower latch gate is shown in the closed, latched, position, showing where fence post 2 would mount secured against the lower post mount bar 75 with notch 93 holding one edge of the fence post.

(41) FIG. 8 is a close up view of the upper latch assembly 61. Upper latch gate 113 is shown open, but upon pulling the operating handle 30 (FIG. 5) forward in a condensed C motion, looking down from above in the preferred mode, according to the position of the operating handle 30 with respect to link pair 117 and lower link pair 78 (a motion that is typical with a toggle past center mechanism), the upper latch gate 113 closes and releasably locks and secures the post to upper post mount bar 68.

(42) FIG. 9 shows the height adjustment with top stop assembly. The top stop mount bar, shown here as 157, is releasably secured and hingedly secured to the shell 29 via pin means at 156. Spring means 159 attached to the shell 29 provide tension means to hold the top stop mount bar against rigid bracket 160 attached to the shell 29. Thus, a mechanical stress release is provided in this mode, where the post mount bar is allowed to move for any sudden small movements when working with the device. Instead of bending, it swings out, and springs back. Post guide with top stop is shown that is adjustable. Bar 130 slides within rings 131a and 131b and is secured and adjustable via eyebolts 153a and 153b used as set screws. Top stop 150 is hingedly attached to top stop bar 130 via bump spring means 152, so as to allow slight movement (shown as arrows 161) when bumping or the top against the offset beam 31.

(43) FIG. 10 is shows the hydraulic arrangement that sits, in the preferred mode, high up hidden in the offset beam 31. Hydraulic lines 430a and 430b from the loader feed the invention hydraulics as shown. A key in the smooth operation is the use of a float valve 250 operated by lever 220 connected as shown. For example, the release valve 260 may activate at around 1500 psi, thus downward pressure is maintained at 1500 until the float valve is activated manually to release most pressure. The float valve 250, when released by pulling the release line 35 in FIG. 1, equalizes the pressure between the two cylinder hydraulic lines and the return lines, thus releasing nearly all pressure that might have even been sufficient to raise the loader offset beam a few inches. With that pressure released however via the float valve activated by the lever 220, the operator can now safely disengage the post securing assembly (operating arm 30) to disengage the device from the post. The operator can now raise the assembly, ready to move forward to place the next post. Without such a pressure releasing mechanism, sudden disengaging with pressure still at 1500 psi can cause significant significant frictionware on the drive lug 56 in FIG. 6b. Float valve 250 is a typical valve used for other purposes such as ground tracking movement of loaders. One such float valve is Prince brand model SS3B1D.

(44) Drive stick 58 (FIG. 1) operates the wood splitter valve 441 to provide lock in dtente so that one push up locks in the flow and thus movement of the cylinder until the cylinder reaches the end and the valve internal pressure trips and releases to stop the movement. Wood splitter valves are common and have internal mechanisms for sensing pressure. Check valve 440 operates as backflow preventer for the proper direction of flow (so that only outflow occurs at 430a, a female connection, and inflow at 430b, a male connection).

(45) The schematic for the hydraulics is show in FIG. 13. Double bypass 460, wood splitter valve 464, float valve 467 and check valve 471 are interconnected in the preferred mode as shown. Wood splitter has valve control 465. A spring holds the float valve control lever 468 in a normally closed position for all ports. All ports to the valve 467 are open when the lever is in the open position, i.e. when activated. This purges hydraulic pressure before opening the drive gate, as discussed. Adjustments 460a and 460b are pressure limiting adjustments to adjust the maximum pressure for each line.

(46) A reverse shell assembly is shown in FIG. 11a. This is a separate attachable shell that allows for placing posts from an opposite direction. This requires slightly different structure, as shown, for the shell assembly. Thus in such a situation, one removes one shell assembly attached to the drive sleeve, and quickly attaches the other. Because the fence post teeth are being approached from a different direction, the parts are as shown. The parts are numbered as they were with the shell assembly in FIG. 6a, with a 3 added. Thus 363 corresponds to 63. An extension 380 is added to attach to guide bar 386 (shown here attached via plate 386 for perspective, inasmuch as the 386 and 380 could be one piece). Extension 357 is shown on the other side of the notch 93 as the post is rotated 180 degrees. Contours 363 are slightly different as well to match the T-post facing a reverse direction.

(47) Similarly, FIG. 11b is slightly altered as shown, with the parts numbered by adding a 3 to the corresponding parts in FIG. 7.

(48) FIG. 12 shows how the invention is attached to the loader bucket. Offset beam 31 has mounting lugs 404 and 405 corresponding to typically available holes at that location on the bucket 410. Installation is simple, by simply attaching pins 401 and 402 through the holes on the bucket and the mounting lug holes. Hose protector 400 is an elongated metal or other protective material extending along the top to protect the hydraulic hoses. Hydraulic lines 430a and 430b attach to the loader hydraulics and feed the invention hydraulics in FIG. 10. They sit in the offset beam 31, protected by it. A post holding bucket attached to the tractor allows for holding a supply of posts.

(49) In use, the operator lines up the tractor adjacent to, and essentially parallel to, the intended fence line where posts are to be placed. At the first location, a post is inserted against the post mount bar, raised to the top stop that has been preset to a setting so as to obtain uniform depth of post driving) then align with the guide shoe in the post holding assembly so as to set it between post teeth, and secured in place in reference to the guide foot 40, to provide for the intended depth. It is latched in place with the handle. When secure, the operator also checks the rotational position and adjusts it if necessary. When ready, the operator operates the hydraulic controls via drive stick 58 to continuously drive the post vertically until the guide foot touches the ground. The hydraulic downward pressure is released via activating stick 35 that operates float valve release 250. The latch is released, releasing the post that is now in the ground vertical and at the desired level, raises the ram 45 (and along with it the shell assembly 28) and the operator drives forward to the next position in accordance with GPS or other measurement means on the tractor, and repeats the process.

(50) It will be seen that the self-locking means (upper and/or lower), if built sufficiently sturdy, can secure posts without the guide shoe 96 and post guide mount bracket assembly, and thus an alternative mode excludes these elements. Thus, posts similar to T-posts but without teeth or nubs, can be driven using such a mode of the invention.

(51) Thus, what is shown is a nonimpact driving attachment for driving T-posts and other fence posts into the ground in a truer vertical, uniform and consistent manner, accurately, and without risking damage to the posts. Other features and objects are apparent in this specification and to those skilled in the art.