GB2474758A

GB2474758A - Attachment apparatus for a post driver

Info

Publication number: GB2474758A
Application number: GB1017262A
Authority: GB
Inventors: John Mowatt Bryce
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-10-20
Filing date: 2010-10-13
Publication date: 2011-04-27
Anticipated expiration: 2030-10-13
Also published as: GB2474758B; GB201017262D0; GB0918320D0; IE20100664A1

Abstract

An attachment apparatus or connection means200for attaching a post driver (100) to an agricultural vehicle, e.g. a tractor300, is capable of allowing arcuate motion of the post driver in a plane which is substantially horizontal and/or substantially parallel to a ground surface. The connection means 200 comprises first271, second272and third273attachment means for attaching respectively first, second and third373portions of the tractor300respectively to first (171), second (172) and third (173) attachment portions of the post driver. The first271and/or second272attachment means comprises a movable or pivotable member216,226and/or an extendable attachment member. The first and second attachment portions may comprise first and second balls provided within first and second receiving portions. The extendable members maybe hydraulic rams. Also disclosed is a method of positioning a post driver.

Description

ATTACHMENT APPARATUS FOR POST DRIVER

FIELD OF INVENTION

The present invention relates generally to agricultural machines or apparatus, and more specifically to post drivers, for example, for driving posts such as fence posts into the ground. The invention particularly, though not exclusively, relates to an attachment apparatus for attaching a post driver to an agricultural vehicle, e.g. a tractor, and capable of allowing arcuate motion of the post driver in a plane which is substantially horizontal and/or substantially parallel to a ground surface. The invention also relates to a post driver and/or a vehicle such as a tractor fitted with such an attachment apparatus. The invention further relates to a method of positioning a post driver relative to a vehicle to which it is attached, e.g. a tractor, comprising actuating arcuate motion of the post driver in a plane which is substantially horizontal and/or substantially parallel to a ground surface.

BACKGROUND OF INVENTION

Post drivers usually consist of a vertical pillar or column guiding a falling weight that is lifted by hydraulic power from, for example, a tractor on which the post driver is mounted. A small ram, working through a lifting mechanism, may pull a rope over a pulley at the top of the pillar or column so as to lift the weight in order that it may then be dropped onto a post.

However, existing post drivers suffer from a number of disadvantages. For example, existing post drivers have difficulty in driving posts in difficult ground conditions. In addition, to properly align existing post drivers, a connected tractor needs to be moved backwards and forwards to correctly position the post driver. Such movement of the tractor can lead to excessive clutch wear. In swinging arm type mechanisms, the side shift needs to be used every time the arm is moved forwards or backwards. It is also difficult to obtain small movements of the tractor on uneven ground.

GB 2 423 549 A, also by the same Applicant, discloses an improved post driver. The post driver comprises: a frame supported on a plurality of legs; a mast adapted to allow a weighted member to travel substantially up and down; wherein there are positioning means provided to enable the position of the mast to be optimised and adapted for alignment with a post to be driven; wherein the mast is telescopic; and the post driver comprises a plurality of pulleys allowing the post driver to be adapted to be used with different heights of post.

GB 2 423 549 A discloses telescopic members for a back shift and for a side shift of the post driver. The present Inventor has identified that this may give rise to problems.

GB 2 420 367 A (BRENNAN and BRENNAN) discloses a post driver comprising: a three point linkage mounting means for securing the support frame to the three point linkage of a tractor; a main mast mounted on the support frame; a support mast slidably mounted on the main mast; a pile driving hammer slidably mounted on a hammer guide rail on the support mast; a pulley adjacent the upper free end of the support mast; a flexible connector connected to the hammer and to the main mast via the pulley; a hydraulic ram connected between the support mast and the pulley for raising the mast; and a post holder comprising a flat plate carrying a depending post engaging spike, the plate fast on a support member, slidably mounted on the main mast.

A post driver is typically transported to a desired location by means of a suitable agricultural vehicle such as a tractor. The post driver is typically attached to the rear of the tractor using conventional attachment systems such as a three point linkage'. A conventional three point linkage typically comprises two low attachment points forming a line substantially parallel to the ground and located near a bottom portion of the rear of the tractor, and a top attachment point located at an elevated portion of the rear of the tractor, the three linkage points defining a substantially isosceles triangle.

This robust and secure type of attachment has been widely used to secure various agricultural machines to the rear of a tractor for a considerable period of time.

However, it also presents some problems. Typically, each of the two low attachment points consists of a lower lift arm securely attached in a non-movable manner to a chassis portion of the tractor. An agricultural machine is then attached to the lower lift arms extending from the rear of the tractor using suitable conventional machinery fixtures such as metal perforated plates and pins.

Although this provides a strong and effective attachment mechanism, it does not provide any flexibility of movement in a plane which is substantially horizontal or substantially parallel to a ground surface. This means that the positioning of the post driver is entirely carried out by movement of the tractor to which it is attached.

In the case of a post driver requiring to be placed in, e.g. a corner area of, e.g. a field, a user typically reverses the tractor along one edge of the area of the field until the post driver is placed in the corner area.

While this operation is usually possible in corners displaying an angle of 90° or more, difficulties may arise in the case of corners displaying an acute angle, i.e. less than 90°. This is because, reversing the tractor into position along one edge of the field corner, the size of the machinery involved may not allow a user to reverse fully into the corner area and position the post driver as required. Similar difficulties may arise when a post driver is required to be positioned in other locations with limited accessibility.

It is an object of at least one embodiment of at least one aspect of the present invention to obviate or at least mitigate at least one or more of the aforementioned problems.

It is an object of at least one embodiment of at least one aspect of the present invention to provide an attachment apparatus for attaching a post driver to a vehicle, e.g. a tractor, the attachment apparatus providing a plurality of attachment points between the post driver and the vehicle, wherein the attachment apparatus is capable of allowing arcuate motion of the post driver in a plane substantially parallel to a ground surface.

It is an object of at least one embodiment of at least one aspect of the present invention to provide an attachment apparatus for attaching a post driver to a vehicle, e.g. a tractor, the attachment apparatus providing a plurality of attachment points between the post driver and the vehicle, wherein the attachment apparatus is capable of allowing arcuate motion of the post driver in a substantially horizontal plane.

It is an object of at least one embodiment of at least one aspect of the present invention to provide a post driver fitted with such an attachment apparatus.

It is an object of at least one embodiment of at least one aspect of the present invention to provide an agricultural vehicle, e.g. a tractor, fitted with such an attachment apparatus.

It is an object of at least one embodiment of at least one aspect of the present invention to provide an agricultural assembly for driving a post into the ground, comprising a vehicle such as a tractor, and a post driver, the vehicle and the post driver being connected to each other by such an attachment apparatus.

It is an object of at least one embodiment of at least one aspect of the present invention to provide a method of positioning a post driver relative to a vehicle to which it is attached, e.g. a tractor, comprising actuating arcuate motion of the post driver in a plane substantially parallel to a ground surface.

StThRY OF INVENTION According to a first aspect of the present invention there is provided an attachment apparatus or connection means for attaching a post driver to an agricultural vehicle, wherein the attachment apparatus or connection means comprises means for allowing arcuate motion of the post driver in a plane substantially parallel to a ground surface and/or a substantially horizontal plane.

The attachment apparatus or connection means may provide a plurality of attachment points between the post driver and the vehicle.

Conveniently, the ground surface may be substantially horizontal.

Typically, the agricultural vehicle may be a tractor.

The arcuate motion may be relative to at least one side of the agricultural vehicle, e.g. at or adjacent one of the plurality of attachment points.

Typically, the attachment apparatus or connection means may comprise first, second and third attachment means for attaching first, second, and third attachment portions of the tractor respectively to first, second and third attachment portions of the post driver.

The first and/or second attachment means may be located near a bottom portion of a rear chassis of the tractor.

The third attachment means may be located near a rear chassis portion of the tractor in an elevated position relative to the first and/or second attachment means.

Typically, the first attachment means may comprise a first support arm extending from and/or secured to a bottom portion of the rear chassis of the tractor, and typically also a first attachment member for attaching the first support arm to the first attachment portion of the post driver.

Typically, the second attachment means may comprise a second support arm extending from and/or secured to a bottom portion of the rear chassis of the tractor, and typically also a second attachment member for attaching the second support arm to the second attachment portion of the post driver.

Conveniently, the first and second attachment members may form an imaginary line substantially parallel to a ground surface.

Conveniently, the ground surface may be substantially horizontal.

Typically, the third attachment means may comprise a top or third extendable attachment member between the third attachment portion of the tractor and the third attachment portion of the post driver. By such provision the post driver may be pivoted relative to an imaginary axis extending between the first and second attachment members.

The top or third extendable attachment member may comprise, e.g., a hydraulic arm, or a mechanically extendable member.

Typically, the third extendable attachment member may be secured to the third attachment portion of the tractor and/or the third attachment portion of the post driver by fixing means such as a knuckle link, perforated plates and pins or the like.

Preferably and advantageously, the first attachment member may comprise a first movable or pivotable member to allow for arcuate movement of the post driver in a plane substantially parallel to a ground surface.

Preferably and advantageously, the second attachment member may comprise a second movable or pivotable member to allow for arcuate movement of the post driver in a plane substantially parallel to a ground surface.

More preferably, the first attachment member may comprise a first pivotable member.

More preferably also, the second attachment member may comprise a second pivotable member.

In such instance, the third extendable attachment member may be capable of moving relative to the third attachment portion of the tractor and/or to the third attachment portion of the post driver to allow for arcuate motion of the post driver in a plane substantially parallel to a ground surface and/or a substantially horizontal plane arcuate motion of the post driver in a plane substantially parallel to a ground surface.

In one embodiment, the third extendable attachment member may be pivotable relative to the third attachment portion of the tractor and/or to the third attachment portion of the post driver to allow for such arcuate motion. Typically, the third extendable attachment member may be secured to the third attachment portion of the tractor and/or to the third attachment portion of the post driver by at least one third pivotable member.

In another embodiment, the attachment of the third extendable attachment member to the third attachment portion of the tractor and/or to the third attachment portion of the post driver may comprise e.g. a bracket provided with e.g. guiding grooves to allow for such arcuate motion.

In another embodiment, the attachment of the third extendable attachment member to the third attachment portion of the tractor and/or to the third attachment portion of the post driver may exhibit a degree of looseness sufficient to allow for such arcuate motion.

Preferably, the first pivotable member may comprise a first ball provided within a first receiving portion of the first support arm.

Conveniently, the first receiving portion may be arranged to allow for rotational and/or pivotal motion of the first ball, and may be arranged to prevent disconnection of the first ball from the first support arm.

Preferably, the second pivotable member may comprise a second ball provided within a second receiving portion of the second support arm.

Conveniently, the second receiving portion may be arranged to allow for rotational and/or pivotal motion of the second ball, and may be arranged to prevent disconnection of the second ball from the second support arm.

Advantageously, the first and/or second ball may be configured to receive means, e.g. a pin or spindle, for attachment to the respective first or second attachment portion of the post driver.

Preferably, the at least one third pivotable member may comprise a third ball provided within a receiving portion of the third extendable member at or near an end nearest the third attachment portion of the tractor and/or the third attachment portion of the post driver.

Conveniently, the receiving portion may be arranged to allow for rotational and/or pivotal motion of the third ball, and may be arranged to prevent disconnection of the third ball from the third extendable member.

Advantageously, the third ball may be configured to receive means, e.g. a pin or spindle, for attachment to the third attachment portion of the tractor or to the third attachment portion of the post driver.

Preferably and advantageously, the first attachment means may comprise a first extendable attachment member.

In use, the first extendable attachment member may extend so as to actuate arcuate motion of the post driver in a plane substantially parallel to a ground surface and/or a substantially horizontal plane.

Preferably and advantageously, the second attachment means may comprise a second extendable attachment member.

In use, the second extendable attachment member may extend so as to actuate arcuate motion of the post driver in a plane substantially parallel to a ground surface and/or a substantially horizontal plane.

In use, extension of the first and/or second extendable attachment member may be complemented with extension of the third extendable member so as to allow for arcuate motion of the post driver in a plane substantially parallel to a ground surface and/or a substantially horizontal plane.

Preferably, first and/or second extendable attachment member may comprise a telescopic member comprising an inner telescopic member and an outer telescopic member, the inner telescopic member being slidable within the outer telescopic member.

Conveniently, the/each telescopic member may further comprise a hydraulic arm arranged to move the inner te]escopic member re]ative to the outer te]escopic member.

Typically, a first end of the hydraulic arm is permanently connected to the inner telescopic member and a second end of the hydraulic arm is permanently connected to the outer telescopic member.

Preferably, the telescopic member may be provided respectively between the first and/or second support arm and the first and/or second attachment portion of the post driver.

In such instance the outer or inner telescopic member may be welded to the first or second attachment portion of the post driver.

Alternatively, the outer or inner telescopic member may be welded to any suitable portion of the post driver, e.g. part of the main frame of the post driver.

Alternatively, the telescopic member may be provided on or form part of the first and/or second support arm.

Alternatively, the telescopic member may be provided between a rear portion of the tractor chassis and the first and/or second support arm.

Preferably, the second attachment means may comprise the second support arm extending from and/or secured to a bottom portion of the rear chassis of the tractor; and the telescopic member between the second support arm and the second attachment portion of the post driver.

Preferably also, the first attachment means may comprise the first support arm extending from and/or secured to a bottom portion of the rear chassis of the tractor, and the first pivotable attachment member connecting the first support arm to the first attachment portion of the post driver. By such provision the attachment apparatus may be capable of actuating arcuate motion of the post driver around the first pivotable attachment member and in a plane substantially parallel to a ground surface.

In one embodiment, the second attachment portion of the post driver may be located at a side of the post driver nearest a mast and hitting hammer of the post driver, and the first attachment portion of the post driver is located at a side of the post driver opposite the mast and hitting hammer of the post driver. By such provision, the mast and hitting hammer of the post driver may be made to move on an arc relative to the first pivotable attachment member and in a plane substantially parallel to a ground surface.

According to a second aspect of the present invention there is provided an attachment apparatus or connection means for attaching a post driver to an agricultural vehicle, wherein the attachment apparatus or connection means is capable of allowing arcuate motion of the post driver in a plane substantially parallel to a ground surface and/or a substantially horizontal plane.

Optional features of the second aspect may be the same as these of the first aspect hereinbefore disclosed, and are not repeated herein again merely for reason of brevity.

According to a third aspect of the present invention there is provided a post driver, the post driver comprising or being fitted with an attachment apparatus or connection means according to the first or second aspects of the invention.

Preferably, the post driver may further comprise means for positioning a mast of the post driver and adapted for alignment with a post to be driven.

Preferably, the means for positioning the mast of the post driver may comprise a back shift and a side shift. By such provision, the post driver may be capable of displaying at least three degrees of motion comprising back shift, side shift and arcuate motion.

Typically, the post driver may comprise: a frame supported on a plurality of legs; a mast adapted to allow a weighted member to travel up and down; wherein there are positioning means provided to enable the position of the mast to be optimised and adapted for alignment with a post to be driven.

Preferably, the positioning means allowing the position of the mast to be optimised and adapted may comprise a back shift and a side shift.

Typically, the back shift and side shift may be at substantially 90° to one another.

Conveniently, the back shift and side shift may be hydraulically operated thereby allowing easy and accurate adjustments of the position of the mast to be made.

Preferably, the mast is telescopic, and the post driver comprises a plurality of pulleys allowing the post driver to be adapted to be used with different heights of post.

Advantageously, the legs may be independently hydraulically operable.

Typically, the positioning means may comprise telescopic means and at least one wear means or resilient means.

Adjustment means may be provided for adjusting or moving the wear means.

The at least one wear means or resilient means may be disposed or adapted to cooperate or interact with the telescopic means, in use.

The/each at least one wear means or resilient means may comprise a wear pad.

The post driver may further comprise a device comprising a body connectable to a post cap of a post driver, and a device post cap rotatably connected to the body.

The device of the first aspect of the present invention may be suitable for retro-fitting to a post driver so as to provide a post rotation capability to the post cap of the post driver.

The body may comprise a first side that is formed so as to receive a spike(s) and/or protrusion(s) that may extend from the post cap.

The post driver may further comprise a device such as a storage or retention device adapted for use with a post driver, the device comprising means for moving a drivable member between a first position and a second position.

The device may comprise a holder or retention means for holding or retaining the drivable member.

The post driver may further comprise at least one first section and at least one second section, wherein at least one of the first section and second section is movable relative to the other of the first or second section and the first section is provided with at least one lubrication or greasing port and the second section is provided with at least one lubricating or greasing aperture.

The at least one lubrication or greasing aperture and the at least one lubrication port may be movable relative to one another so as at least in one disposition to be in communication with one another.

Preferably and advantageously, the at least one lubrication or greasing aperture is alignable with the at least one lubrication or greasing port so as to receive grease therefrom.

According to a fourth aspect of the present invention there is provided an agricultural vehicle, the vehicle comprising or being fitted with an attachment apparatus or connection means according to the first or second aspects of the invention.

Typically, the agricultural vehicle may be a tractor.

According to a fifth aspect of the present invention there is provided an assembly for driving a post into the ground, comprising an agricultural vehicle, a post driver, and means for allowing arcuate motion of the post driver in a plane substantially parallel to a ground surface and/or a substantially horizontal plane.

Preferably, the means for allowing arcuate motion comprises an attachment apparatus or connection means according to the first or second aspects of the present invention.

Typically, the agricultural vehicle may be a tractor.

According to a sixth aspect of the present invention there is provided a method of positioning a post driver relative to an agricultural vehicle to which the post driver is attached, comprising actuating arcuate motion of the post driver in a plane substantially parallel to a ground surface and/or a substantially horizontal plane.

Conveniently, the ground surface may be substantially horizontal.

Typically, the agricultural vehicle may be a tractor.

Preferably, the method may comprise actuating arcuate motion of the post driver in a plane substantially parallel to a ground surface by using the attachment apparatus according to the first aspect of the invention.

Alternatively, the method may comprise actuating arcuate motion of the post driver in a substantially horizontal plane by using the attachment apparatus according to the second aspect of the invention.

Preferably, the method comprises the steps of: driving the vehicle to position the post driver in a desired location; actuating arcuate motion of the post driver in a plane substantially parallel to a ground surface to further position the post driver; and inducing contact of the post driver onto a ground surface.

Conveniently, the ground surface may be substantially horizontal.

Preferably, the post driver may be a post driver according to the third aspect of the present invention.

The step of inducing contact of the post driver with the ground surface may comprise operating a plurality of independent hydraulic legs provided on the post driver.

The method may further comprise adjusting and optimising the position of a mast of the post driver by operating positioning means provided on the post driver.

Preferably, the positioning means allowing the position of the mast to be adjusted and optimised may comprise a back shift and a side shift.

BRIEF DESCRIPTION OF DRAWINGS

Embodiments of the present invention will now be described by way of example only, and with reference to the accompanying drawings, which are: Figure 1 a view from one side of a post driver

according to the prior art;

Figure 2 a view from another side of the post driver of Figure 1; Figure 3 a rear view of the post driver of Figure 1; Figure 4 a front view of the post driver of Figure 1; Figure 5 a top view of the post driver of Figure 1; Figure 6 a partial front view of the post driver of Figure 1 in operation; Figure 7 a partial side view of the post driver of Figure 1; Figure 8 the post driver of Figure 1 in a first position connected to a tractor; Figure 9 the post driver of Figure 1 in a second position connected to a tractor; Figure 10 a simplified side view of a side shift of the post driver of Figure 1; Figure 11 a partial view of the post driver of Figure 1 showing a third or top attachment means; Figure 12 a rear view of a tractor showing first and second attachment means of an attachment apparatus or connection means according to an embodiment of the present invention; Figure 13 an enlarged view of an end portion of a support arm of the first or second attachment means of the attachment apparatus of Figure 12, showing a pivotable ball within a receiving portion of the support arm; Figure 14 an enlarged view from above of the end portion of Figure 13 showing an attachment pin provided through the

pivotable ball; and

Figure 15 a side view of an extendable attachment member provided between a support arm and an attachment portion of the post driver of Figure 12.

Figure 16(a) a schematic view from above showing a conventional three point linkage attachment, in use.

Figure 16(b) a schematic view from above showing the attachment apparatus of Figure 12, in use.

DETAILED DESCRIPTION OF DRAWINGS

Referring initially to Figures 1 to 5, there is shown a post driver, generally designated 100, according to the prior art. The post driver 100 comprises three legs 102, 104, 106. Leg 104 is a parking leg, and is used to stabilise the post driver 100 when parked, i.e. not attached to a tractor. As shown in Figure 1, the legs 102, 104, 106 also comprise skid pads 108, 110, 112 which provide a stable platform for the post driver 100 to operate on. The skids 108, 110, 112 help to prevent the post driver 100 from becoming bogged down' in damp conditions. The legs 102, 104, 106 are hydraulically operated and may be adjusted to any required level.

Figure 1 also shows that the post driver 100 comprises a counterbalance 114 which helps to stabilise the post driver 100 during use. Of a similar size to the counterbalance 114, and as shown in Figure 1, there is a hitting hammer 116 which moves up and down along a mast 117. The hitting hammer 116 is connected to a pulley 119 via a rope 121. The rope 121 is connected to driving means in the post driver 100 which provides the driving force for the post driver 100.

Figure 2 which is a view of the other side of the post driver 100 shown in Figure 1, clearly shows that there are two receiving members 118 within which pallet forks from a forklift truck may be inserted allowing the post driver 100 to be easily lifted.

Figure 2 also shows first 171, second 172 and third 173 attachment portions of the post driver 100 for attaching the post driver 100 to a tractor. In this embodiment the first 171, second 172 and third 173 attachment portions consist of first 171, second 172 and third 173 hitch brackets. A top hydraulic arm 150 is connected at one end to the third hitch bracket 173 of the post driver 100.

Figure 6 shows operation of a back shift of the post driver 100. The back shift controls movement of the post driver 100 fore and aft. Figure 6 shows the hitting hammer 116 positioned slightly above a post cap 126. The back shift comprises telescopic means which comprises two back shift inner sliding members 122 which are moveable in and out of back shift (receiving) members 123. A hydraulic cylinder 124 operates the back shift. Figure 6 also shows the hydraulic controls 120 which are used to obtain the necessary adjustment in the positioning of the mast 117.

Figure 6 shows a post 125 out of alignment with the mast 117. The post 125 will not be properly driven in using this incorrect alignment. To obtain a correct alignment of the post 125 with the mast 117 the back shift of the post driver 100 is operated with the effect that the back shift inner sliding members 122 are moved slightly into the receiving members 123. Additionally, the top hydraulic arm 150 may be operated which causes the whole post driver 100 to be pivoted backwards or forwards and in so doing adjusts the vertical alignment of the mast 117 with the post 125. Once the back shift and/or top hydraulic arm has been operated, the post 125 is in substantial alignment with the mast 117, thereby allowing the post driver 100 to operate in a required manner. This is an important function of the post driver as this allows the post 125 to be correctly aligned with the mast 117 without the need to move a tractor -e.g. to which the post driver 100 is mounted or hitched.

Small movements of a tractor can be extremely difficult -especially so on uneven ground -and can also lead to excessive clutch wear.

A side shift (not shown) of the post driver 100 is of a similar telescopic nature to the back shift. The side shift controls movement of the post driver side to side.

The side shift comprises inner (sliding) members 128 and outer members 129. The side shift allows the mast 117 to be pulled out to a position where a post 125 is to be driven in. The side shift is activated by another hydraulic cylinder.

By using the back shift and the side shift, it is possible to obtain complete movement of the mast 117 to thereby allow the mast 117 to be correctly positioned with a post 125 without the need for moving a tractor.

Referring to Figure 10, the side shift comprises at least one, and in this embodiment, a pair of telescopic members. The telescopic members each comprise an outer member 129 and an inner member 128, the inner member being slidable in and out relative to the outer member 129. One of the inner members 128 is attached to a tilt ram support bracket 136. The inner members 128 are connected together at ends thereof by a cross member 128'.

The outer member(s) 129 is/are tubular, and in this embodiment of rectilinear (box) cross-section. The inner members 128 fits within the inner bore of the outer member 129 and are slidable therewithin. The inner member(s) 128 are in this embodiment of rectilinear (box) cross-section, and are also beneficially tubular.

Figure 11 shows the top hydraulic arm 150 attached to a tractor 300. One end of the top hydraulic arm 150 is connected to the third hitch bracket 173 of the post driver 100, and the other end of the top hydraulic arm is connected to the third attachment bracket 373 of the tractor 300. Figure 11 also shows the main frame 140 of the post driver 100.

Figure 12 shows a rear view of a tractor 300 showing part of an attachment apparatus or connection means 200 according to a first embodiment of the present invention.

In this embodiment the attachment apparatus 200 provides three attachment points between the post driver 100 and the tractor 300.

Typically, the attachment apparatus comprises first 271, second 272 and third 273 attachment means for attaching first 371, second 372, and third 373 portions of the tractor 300 respectively to first 171, second 172 and third 173 attachment portions of the post driver 100.

In this embodiment, the first 271 and second 272 attachment means are located near a bottom portion of a rear chassis of the tractor 300. The third attachment means 273 is located near a rear chassis portion of the tractor 300 in an elevated position relative to the first 271 and second 272 attachment means.

The first attachment means 271 comprises a first 210 support arm extending from and secured to a bottom portion of the rear chassis of the tractor 100, and a first attachment member 215 for attaching the first support arm 210 to the first attachment portion 171 of the post driver 100.

The second attachment means 272 comprises a second support arm 220 extending from and secured to a bottom portion of the rear chassis of the tractor 100, and a second attachment member 225 for attaching the second support arm 220 to the second attachment portion 172 of the post driver 100.

Conveniently, the first 215 and second 225 attachment members form an imaginary line substantially parallel to a ground surface.

In this embodiment, the ground surface is substantially horizontal. In the context of the invention, the term substantially horizontal is understood to mean at an angle suitable for the operation of a post driver attached to a tractor. Thus, the term substantially horizontal is understood to mean at an angle in the region of 00 to approximately 40°.

Typically, the third attachment means 273 comprises a top hydraulic arm 150, between the third attachment portion 373 of the tractor 300 and the third attachment portion 173 of the post driver 100. By such provision the post driver may be pivoted relative to an imaginary axis extending between the first 215 and second 225 attachment members.

In this embodiment, the top hydraulic arm 150 is secured to the third attachment portion 373 of the tractor 300 and to the third attachment portion 173 of the post driver 100 by means of a bracket and pin or knuckle link.

Preferably and advantageously, the first attachment member 215 comprises a first movable or pivotable member 216 to allow for arcuate movement of the post driver in a plane substantially parallel to a ground surface.

Preferably and advantageously, the second attachment member 225 comprises a second movable or pivotable member 226 to allow for arcuate movement of the post driver in a plane substantially parallel to a ground surface.

In such instance, the top hydraulic arm 150 is capable of moving relative to the third attachment portion 373 of the tractor 300 and/or to the third attachment portion 173 of the post driver 100 to allow for arcuate motion of the post driver in a plane substantially parallel to a ground surface.

In this embodiment, the attachment of the top hydraulic arm 150 to the third attachment portion 373 of the tractor and/or to the third attachment portion 173 of the post driver 100 exhibits a degree of looseness sufficient to allow for such arcuate motion of the post driver.

In a preferred embodiment, the attachment of the top hydraulic arm 150 to the third attachment portion 373 of the tractor and/or to the third attachment portion 173 of the post driver 100 comprises (not shown) third attachment member (not shown) comprising third movable or pivotable member (not shown) to allow for arcuate movement of the post driver in a plane substantially parallel to a ground surface.

As shown in Figure 12, the first pivotable member 216 comprises a first ball 217 provided within a first receiving portion 211 of the first support arm 210. The second pivotable member 226 comprises a second ball 227 provided within a second receiving portion 221 of the second support arm 220.

As shown in Figures 13 and 14, the first 211 and second 221 receiving portions are arranged to allow for rotational and/or pivotal motion of the first 217 and second 227 balls, and are also configured to prevent disconnection of the first 217 and second 227 balls from the first 210 and second 220 support arms.

As shown in Figures 12 and 14, the first 217 and/or second 227 ball is configured to receive means, e.g. a pin or spindle, for attachment to the respective first 171 or second 172 attachment portion of the post driver 100.

Figure 14 shows an enlarged view of the first ball 217 within the first receiving portion 211 of the first support arm 210. A rod 212 is provided through the first ball 217 for attachment to the first attachment portion 171 of the post driver 100. The rod 212 is secured to the first ball 217 by provision of a handle 213 and a pin 214.

Preferably and advantageously, the second attachment means 272 comprises an extendable attachment member 280 as shown in Figure 15.

In use, the extendable attachment member 280 extends so as to actuate arcuate motion of the post driver 100 in a plane substantially parallel to the ground and/or a substantially horizontal plane.

In use, extension of the extendable attachment member 280 is complemented with similar simultaneous extension (lengthwise) of the top hydraulic arm 150 so as to allow for arcuate motion of the post driver 100 in a plane substantially parallel to the ground and/or a substantially horizontal plane.

The hydraulic arm 150 is typically a piston and cylinder arrangement.

Preferably, the extendable attachment member 280 comprises a telescopic member 281 comprising an inner telescopic member 282 and an outer telescopic member 283, the inner telescopic member 282 being slidable within the outer telescopic member 283.

Conveniently, the telescopic member 281 comprises a hydraulic arm 285 arranged to move the inner telescopic member 282 relative to the outer telescopic member 283.

Typically, a first end 286 of the hydraulic arm 285 is permanently connected to the inner telescopic member 282 and a second end 287 of the hydraulic arm 285 is permanently connected to the outer telescopic member 283.

In this embodiment, the telescopic member 281 is provided between the second support arm 220 and the second attachment portion 172 of the post driver 100.

The inner telescopic member 282 is connected to the second support arm 220 via the second pivotable ball 227.

The outer telescopic member 283 is preferably welded to the second attachment portion 172 of the post driver 100.

In this embodiment, the first attachment means 271 comprises the first support arm 210 extending from and/or secured to a bottom portion of the rear chassis of the tractor 300, and the first pivotable ball 217 connecting the first support arm 210 to the first attachment portion 171 of the post driver 100. By such provision the attachment apparatus 200 is capable of actuating arcuate motion of the post driver 100 around the first pivotable ball 217 and in a plane substantially parallel to the ground and/or substantially horizontal.

The arc of motion is shown on Figure 12 as arc (a)- (a), and the radius of arcuate motion around the first pivotable ball 217 is depicted as line (i)-(i) In this embodiment, the second attachment portion 172 of the post driver 100 is located at a side of the post driver nearest a mast 117 and hitting hammer 116 of the post driver 100, and the first attachment portion 171 of the post driver 100 is located at a side of the post driver opposite the mast 117 and hitting hammer 116 of the post driver 100. By such provision, the mast 117 and hitting hammer 116 of the post driver 100 may be made to move on an arc relative to the first pivotable ball 217 and in a plane substantially parallel to the ground and/or substantially horizontal.

In another embodiment, the telescopic member 281 may be provided on or form part of the first 210 and/or second 220 support arm.

In yet another embodiment, the telescopic member 281 may be provided between a rear portion of the tractor chassis and the first 210 and/or second 220 support arm.

Figure 16(a) shows a post driver 100 which is connected to a tractor 300 via a three point linkage attachment 400. In use, a user typically reverses the tractor 100 along one edge 511 of a field 510. This allows the user to position the mast 117 and hitting hammer 116 of the post driver 100 into a corner area 512

of the field 510.

Figure 16(b) shows a post driver 100 which is connected to a tractor 300 via the attachment apparatus or connection means 200. As shown on Figure 16(b), the corner area 522 of field 520 displays an acute angle. In use, a user typically reverses the tractor 100 along or near one edge 521 of the field 520. When the post driver is moved near the corner area 522 of the field 520, the user operates the extendable attachment member 280 or telescopic member 281 provided between the second support arm 220 and the second attachment portion 172 of the post driver 100. The user simultaneously operates the top hydraulic arm 150. This causes the post driver 100 to move arcuatelLy around first movable or pivotabiLe member 216 or first pivotable ball 217 in a plane substantially parallel to the ground or a substantially horizontal plane. This, in turn, enables the user to position the mast 117 and hitting hammer 116 of the post driver 100 into the corner area 522 of the field 520, which corner displays an acute angle.

It will be appreciated that the embodiments of the present invention are given by way of example only, and are not meant to be limiting to the scope thereof in any way. For example, whereas in the above example the telescopic member is provided at side of the post driver nearest its mast and hitting hammer, the telescopic member could alternatively be provided at a side of the post driver opposite its mast and hitting hammer.

Alternatively, a telescopic member could be provided on both sides of the post driver, the telescopic members being attached to respectively first 210 and second 220 support arms via first 217 and second 227 pivotable balls.

Claims

CLAIMS1. An attachment apparatus or connection means for attaching a post driver to an agricultural vehicle, wherein the attachment apparatus or connection means comprises means for allowing arcuate motion of the post driver in a plane substantially parallel to a ground surface and/or a substantially horizontal plane.
2. An attachment apparatus or connection means according to claim 1, comprising a plurality of attachment points between the post driver and the vehicle.
3. An attachment apparatus or connection means according to claim 1 or claim 2, wherein the agricultural vehicle comprises a tractor.
4. An attachment apparatus or connection means according to any preceding claim, wherein the arcuate motion is relative to at least one side of the agricultural vehicle, e.g. at or adjacent one of the plurality of attachment points.
5. An attachment apparatus or connection means according to any preceding claim, wherein the attachment apparatus or connection means comprises first, second and third attachment means for attaching first, second and third attachment portions of the agricultural vehicle respectively to first, second and third attachment portions of the post driver.
6. An attachment apparatus or connection means according to claim 5, wherein the first and/or second attachment means is/are located near a bottom portion of a rear chassis of the agricultural vehicle.
7. An attachment apparatus or connection means according to claim 5, wherein the third attachment means is located near a rear chassis portion of the agricultural vehicle in an elevated position relative to the first and/or second attachment means.
8. An attachment apparatus or connection means according to any of claims 5 to 7, wherein the first attachment means comprises a first support arm extending from and/or secured to a bottom portion of the rear chassis of the agricultural vehicle, and a first attachment member for attaching the first support arm to the first attachment portion of the post driver.
9. An attachment apparatus or connection means according to any of claims 5 to 8, wherein the second attachment means comprises a second support arm extending from and/or secured to a bottom portion of the rear chassis of the agricultural vehicle, and a second attachment member for attaching the second support arm to the second attachment portion of the post driver.
10. An attachment apparatus or connection means according to any of claims 5 to 9, wherein the third attachment means comprises a top or third extendable attachment member between the third attachment portion of the agricultural vehicle and the third attachment portion of the post driver.
11. An attachment apparatus or connection means according to claim 10, wherein the top or third extendable attachment member comprises a hydraulic arm or a mechanically extendable member.
12. An attachment apparatus or connection means according to claim 8, wherein the first attachment member comprises a first movable or pivotable member to allow for arcuate movement of the post driver in a plane substantially parallel to a ground surface.
13. An attachment apparatus or connection means according to c]aim 12, wherein the first attachment member comprises a first pivotable member.
14. An attachment apparatus or connection means according to claim 13, wherein the first pivotable member comprises a first ball provided within a first receiving portion of the first support arm.
15. An attachment apparatus or connection means according to claim 14, wherein the first receiving portion is arranged to allow for rotational and/or pivotal motion of the first ball, and to prevent disconnection of the first ball from the first support arm.
16. An attachment apparatus or connection means according to claim 9, wherein the second attachment member comprises a second movable or pivotable member to allow for arcuate movement of the post driver in a plane substantially parallel to a ground surface.
17. An attachment apparatus or connection means according to claim 16, wherein the second attachment member comprises a second pivotable member.
18. An attachment apparatus or connection means according to claim 17, wherein the second pivotabiLe member comprises a second ball provided within a second receiving portion of the second support arm.
19. An attachment apparatus or connection means according to claim 18, wherein the second receiving portion is arranged to allow for rotational and/or pivotal motion of the second ball, and to prevent disconnection of the second ball from the second support arm.
20. An attachment apparatus or connection means according to claim 14 or claim 18, wherein the first and/or second ball may be configured to receive means, e.g. a pin or spindle, for attachment to the respective first or second attachment portion of the post driver.
21. An attachment apparatus or connection means according to any of claims 10 to 20, wherein the third extendable attachment member is capable of moving relative to the third attachment portion of the agricultural vehicle and/or to the third attachment portion of the post driver to allow for arcuate motion of the post driver in a plane substantially parallel to a ground surface and/or a substantially horizontal plane.
22. An attachment apparatus or connection means according to any of claims 5 to 21, wherein the first attachment means comprises a first extendable attachment member.
23. An attachment apparatus or connection means according to any of claims 5 to 22, wherein the second attachment means comprises a second extendable attachment member.
24. An attachment apparatus or connection means according to claim 22 or claim 23, wherein the first and/or second extendable attachment member comprises a telescopic member comprising an inner telescopic member and an outer telescopic member, the inner telescopic member being slidable within the outer telescopic member.
25. An attachment apparatus or connection means according to claim 24, wherein the/each telescopic member further comprises a hydraulic arm arranged to move the inner telescopic member relative to the outer telescopic member.
26. An attachment apparatus or connection means according to claim 24, wherein the telescopic member is provided respectively between the first and/or second support arm and the first and/or second attachment portion of the post driver.
27. An attachment apparatus or connection means according to any of claims 5 to 26, wherein the first attachment means comprises a first support arm extending from and/or secured to a bottom portion of the rear chassis of a tractor, and a first pivotable attachment member connecting the first support arm to a first attachment portion of the post driver.
28. An attachment apparatus or connection means according to any of claims 5 to 27, wherein the second attachment means comprises a second support arm extending from and/or secured to a bottom portion of the rear chassis of a tractor; and a telescopic member between the second support arm and a second attachment portion of the post driver.
29. An attachment apparatus or connection means according to any of claims 5 to 28, wherein the second attachment portion of the post driver is located at a side of the post driver nearest a mast and hitting hammer of the post driver, and the first attachment portion of the post driver is located at a side of the post driver opposite the mast and hitting hammer of the post driver.
30. An attachment apparatus or connection means for attaching a post driver to an agricultural vehicle, wherein the attachment apparatus or connection means is capable of allowing arcuate motion of the post driver in a plane substantially parallel to a ground surface and/or a substantially horizontal plane.
31. An attachment apparatus or connection means according to claim 30, comprising an attachment apparatus or connection means according to any of claims 1 to 29.
32. A post driver comprising or being fitted with an attachment apparatus or connection means according to any of claims 1 to 31.
33. A post driver according to claim 32, further comprising means for positioning a mast of the post driver and configured for alignment with a post to be driven.
34. A post driver according to claim 33, comprising a back shift and a side shift.
35. An agricultural vehicle comprising or being fitted with an attachment apparatus or connection means according to any of claims 1 to 31.
36. An agricultural vehicle according to claim 35, wherein the agricultural vehicle comprises a tractor.
37. An assembly for driving a post into the ground, comprising an agricultural vehicle, a post driver, and means for allowing arcuate motion of the post driver in a plane substantially parallel to a ground surface and/or a substantially horizontal plane.
38. An assembly according to claim 37, wherein the means for allowing arcuate motion comprises an attachment apparatus or connection means according to any of claims 1 to 31.
39. A method of positioning a post driver relative to an agricultural vehicle to which the post driver is attached, comprising actuating arcuate motion of the post driver in a plane substantially parallel to a ground surface and/or a substantially horizontal plane.
40. A method according to claim 39, wherein the agricultural vehicle comprises a tractor.
41. A method according to claim 39 or claim 40, comprising using an attachment apparatus or connection means according to any of claims 1 to 31.
42. A method according to any of claims 39 to 41, comprising the steps of: driving the agricultural vehicle to position the post driver in a desired location; actuating arcuate motion of the post driver in a plane substantially parallel to a ground surface and/or a substantially horizontal plane to further position the post driver; and inducing contact of the post driver onto a ground surface.
43. A method according to any of claims 39 to 42, wherein the post driver comprises a post driver according to any of claims 32 to 34.
44. A method according to claim 42, wherein the step of inducing contact of the post driver onto a ground surface comprises operating a plurality of independent hydraulic legs provided on the post driver.
45. A method according to any of claims 39 to 44, further comprising adjusting and optimising the position of a mast of the post driver by operating positioning means provided on the post driver.
46. A method according to claim 45, wherein the positioning means allowing the position of the mast to be adjusted and optimised comprises a back shift and a side shift.
47. An attachment apparatus or connection means as hereinbefore described with reference to the accompanying drawings.
48. A post driver as hereinbefore described with reference to the accompanying drawings.
49. An agricultural vehicle as hereinbefore described with reference to the accompanying drawings.
50. An assembly for driving a post into the ground as hereinbefore described with reference to the accompanying drawings.
51. A method of positioning a post driver relative to an agricultural vehicle as hereinbefore described with reference to the accompanying drawings.