WO1994008099A1 - Linkage arrangement - Google Patents
Linkage arrangement Download PDFInfo
- Publication number
- WO1994008099A1 WO1994008099A1 PCT/NZ1993/000089 NZ9300089W WO9408099A1 WO 1994008099 A1 WO1994008099 A1 WO 1994008099A1 NZ 9300089 W NZ9300089 W NZ 9300089W WO 9408099 A1 WO9408099 A1 WO 9408099A1
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- WO
- WIPO (PCT)
- Prior art keywords
- linkage
- arm
- limit
- mounting
- relative
- Prior art date
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
- E02F3/36—Component parts
- E02F3/38—Cantilever beams, i.e. booms;, e.g. manufacturing processes, forms, geometry or materials used for booms; Dipper-arms, e.g. manufacturing processes, forms, geometry or materials used for dipper-arms; Bucket-arms
- E02F3/382—Connections to the frame; Supports for booms or arms
- E02F3/384—Connections to the frame; Supports for booms or arms the boom being pivotable relative to the frame about a vertical axis
Definitions
- the present invention relates to a linkage arrangement suitable for mounting an implement to a structure.
- the invention relates to a linkage arrangement for mounting implements such as backhoes, verge mowers, shovels and the like to prime movers and will principally be described hereinafter with reference to this application. It should be appreciated, however, that the invention is not limited to this type of use.
- US Patent No. 3,313,431 Kelly discloses a similar double arm linkage arrangement for a backhoe wherein the articulated arm is mounted on a side shift attachment on a prime mover with pivotal movement of the arms about the pivots provided by rack and pinion actuators.
- the provision of a side shift attachment enables a lateral change in limits at the linkage mounting to the prime mover, however limits to movement and orientation of the backhoe relative to the linkage are fixed, so that there is a similar limitation to mobility of operation.
- US Patent No. 4,049,139 Stedman discloses a linkage arrangement for a backhoe comprising two linkage arms pivotally connected together, the linkage arrangement being pivotally connected to the prime mover. Pivotal movement between the two arms is provided by a hydraulic swing motor mounted therebetween.
- the hydraulic swing motor gives a high degree of mobility such that the linkages can be folded to enable an implement to be stowed close to the prime mover for transport.
- skilled operator control of swing motor rotation is required depending on the orientation of the linkage relative to the prime mover, to ensure that the implement does not strike the prime mover under normal operating conditions. Operability of the linkage arrangement is thus compromised.
- the present invention is thus addressed to methods and apparatus for supporting an implement such that the implement is movable relative to a support member which is also movable relative to a structure, movement of the implement and support member being limited by mechanical and/or mechanically operated limits, such methods and apparatus enabling an increase in the ability to move and orientate the implement within a limit envelope, or at least provide the public with a useful choice.
- such methods and apparatus may provide a linkage arrangement for the support and positioning of an implement, which enables an increase in the possible scope of operation of the implement mounted thereon compared to conventional support linkages, while still ensuring that the implement does not to contact the prime mover when supported close to the prime mover, and which enables the implement to be supported within weight distribution, and dimension requirements for road transportation.
- a linkage arrangement for mounting an implement to a structure said linkage arrangement comprising: a linkage arm having a first end and a second end distal from the first end and adapted to be pivotally mounted at its first end to the structure at a first pivot point and arranged to pivot relative to the structure about the first pivot point; a mounting head rotatably mounted to the second end of the linkage arm and arranged to rotate relative to the linkage arm and adapted to have said implement mounted directly or indirectly thereon; first actuating means for pivoting the linkage arm relative to the structure; second actuating means for rotating the mounting head relative to the linkage arm, limit means defining limits to the extent of rotational motion of the mounting head to either side of a central datum line about which the mounting head pivots relative to the linkage arm; and limit adjusting means for adjusting the limit means such that the limits to the extent of rotational motion of the mounting head are varied with pivotal movement of the linkage arm relative to the structure.
- said limit means comprises a limit support means on which are mounted mechanical limit means, said limit support means being mounted on said linkage arm so as to be movable relative thereto, and said limit adjusting means comprises mechanical means for adjusting a location of said limit support means relative to said linkage arm with pivotal movement of said linkage arm relative to said structure.
- said limit support means comprises an orientation member, and said mechanical limit means comprises two limit stops attached thereto, said orientation member being pivotally mounted on said linkage arm, and said limit adjusting means comprises mechanical means for changing an orientation of said central datum line relative to said linkage arm with pivotal movement of said linkage arm relative to said structure.
- said second actuating means for rotating said mounting head relative to said linkage arm comprises a rotary actuator having a shaft and vane rotatably mounted in a housing so as to be rotatable in said housing between limits provided on said housing and on opposite sides of said vane, and said orientation member comprises the casing or shaft of said rotary actuator.
- said second actuating means for rotating said mounting head relative to said linkage arm comprises a linear actuator having a rod member moving relative to a casing between limits provided on said rod member and said casing, and said orientation member comprises one of said rod member and said casing of said linear actuator.
- said limit support means comprises at least one cam member having a peripheral face for providing a mechanical limit to rotation of said mounting head, said cam member being mounted on said linkage arm so as to be rotatable relative thereto, thereby moving the position of said mechanical limit.
- said second actuating means for rotating said mounting head relative to said linkage arm comprises a rotary actuator having a shaft and vane rotatably mounted in a housing, said housing being mounted on said linkage arm, and said cam member being mounted inside said housing so as to be rotatable relative thereto, with said peripheral face arranged so as to provide limits to rotary motion of said vane.
- said limit adjusting means comprises linkage means connected between said limit support means and said structure.
- said linkage means comprises gearing and a drive shaft whereby rotational movement proportional to pivotal movement of said linkage arm about said first pivot is transmitted to said limit support means.
- said linkage means comprises a limit actuating arm whereby linear movement proportional to pivotal movement of said linkage arm about said first pivot is transmitted to said limit support means.
- said linkage means comprises a limit actuating arm whereby linear movement proportional to pivotal movement of said linkage arm about said first pivot is transmitted to said orientation member, wherein said limit actuating arm is pivotally mounted at one end to said structure adjacent the pivot point of said first end of said linkage arm and is pivotally mounted at another end to said orientation member; wherein location of the mounting of said limit actuating arm to the structure for predetermined extremes of pivotal rotation of said orientation member relative to said linkage arm for predetermined extremes of pivotal rotation of said linkage arm relative to said structure is determined by;
- said linkage means further comprises an auxiliary arm pivotally mounted at one end to said structure at a predetermined point adjacent the pivot point of said first end and on an opposite side to the pivotal mounting of said limit actuating arm, and is pivotally mounted at another end to said orientation member such that said rotatable mounting of said mounting head is disposed substantially centrally and symmetrically between the pivotal mountings of said auxiliary arm and said limit actuating arm when said linkage arm has been rotated to a position intermediate its positions in (a) and (b).
- said linkage arm comprises a plurality of members connected together such that the relative location between said first and second ends is variable.
- said linkage arm comprises a single member with said first and second ends fixedly located relative to each other.
- a linkage arrangement substantially as described above, said linkage arrangement comprising: a second linkage arm having a first end and a second end distal from the first end with the first end fixedly mounted on the mounting head of said linkage arm, a second mounting head rotatably mounted to the second end of the second linkage arm, and arranged to rotate relative to the second linkage arm, and adapted to have the implement mounted directly or indirectly thereon; third actuating means for pivoting the second linkage arm relative to the linkage arm; fourth actuating means for rotating the second mounting head relative to the second linkage arm; second limit means defining limits to the extent of rotational motion of the second mounting head to either side of a central datum line about which the second mounting head pivots relative to the second arm; and second limit adjusting means for adjusting the second limit means such that said limits to the extent of rotational motion of the second mounting head are varied with pivot
- said second limit means comprises a second limit support means on which are mounted mechanical limits, said second limit support means being mounted on said second linkage arm so as to be movable relative thereto, thereby moving said mechanical limits, and said second limit adjusting means comprises second mechanical means for moving said second limit support means relative to said second linkage arm with pivotal movement of said second linkage arm relative to said linkage arm.
- said second limit support means comprises a second orientation member, and said second limits comprise two limit stops attached thereto, said second orientation member being pivotally mounted on said second linkage arm such that an orientation of said limits stops relative to said second linkage arm is variable with pivotal movement of said second orientation member.
- said second actuating means for rotating said second mounting head relative to said fourth linkage arm comprises a rotary actuator having a shaft and vane rotatably mounted in a housing so as to be rotatable in said casing between limits provided on said casing and on opposite sides of said vane, and said second orientation member comprises the casing or shaft of said rotary actuator.
- said limit actuating arm serves additionally as a support member of said linkage arrangement, said limit actuating arm and said linkage arm being arranged in the form of a pantograph, formed by the structure, the orientation member and the arms themselves.
- said structure is a prime mover and said implement is a backhoe.
- a method of increasing the ability to move and orientate an implement movably supported relative to a structure by a linkage arrangement, and limited from movement relative to the linkage arrangement and the structure by limit means comprising the step of varying limits imposed by the limit means with movement of the implement relative to the structure.
- the present invention consists in a method of changing a limit to rotation of an arm of a linkage provided by limit means, said method comprising the steps of: mounting said limit means so as to be movable relative to said arm; and linking a movement of said arm to said limit means so that said limit to rotation is changed with movement of said arm.
- the present invention consists in a prime mover vehicle having an implement supported operatively therefrom by a linkage arrangement as hereinbefore described.
- the present invention consists in a linkage arrangement for mounting an implement to a structure comprising: a first linkage arm having a first end and a second end distal from said first end, pivotally mounted at its first end to the said structure at a first pivot point, and arranged to rotate relative to the structure about the said first pivot point; a first orientation member rotatably mounted to the said second end of the said first linkage arm and arranged to rotate thereon; a first linkage means pivotally mounted from said structure adjacent the first pivot point and extending to and pivotally mounted to the said first orientation member other than at rotation axis of said mounting of said first linkage arm and first orientation member; a second linkage arm having a first end and a second end remote from said first end, pivotally mounted at said first end to said first orientation means at a second pivot point, said second pivot point being displaced from said first pivot point so as to be capable of providing a moment about said second pivot point and arranged to pivot relative to said first orientation member about said second pivot point; a second orientation member
- first linkage means consists of at least two members.
- second linkage means consists of at least two members.
- means is provided to rotate first linkage arm about said structure.
- means for rotating consists in a hydraulic ram.
- structure consists of a prime mover.
- said implement consists of a hoe.
- the present invention consists in a linkage arrangement for mounting an implement to a structure
- first linkage arm and said second linkage arm in a cross over arrangement.
- said means to rotate consists in a hydraulic ram.
- said structure comprises a prime mover.
- said implement comprises a mower.
- said implement comprises a backhoe shovel.
- the structure is a prime mover such as the prime mover of a backhoe or verge mower, but may also be a stationary body.
- the linkage arm may be a single integral arm or may comprise a plurality of members connected together such that the relationship between said first and second ends is variable.
- the linkage arm may comprise two arms pivotally connected together and provided with a suitable actuator to pivot the arms relative to each other.
- the mounting head may comprise any means whereby a tool or implement may be mounted directly or indirectly on the linkage arm. In the case of indirect mounting this may involve additional linkage arms fixedly connected to or formed integral with the mounting head. The additional linkage arms may also be provided with mounting heads for directly or indirectly mounting the implement.
- the linkage arrangement may comprise one or more such linkage arms with one or more such mounting heads.
- a first one of the two or more arms may have a first mounting head provided at a second end thereof and may be pivotally mounted to the prime mover at its first end
- a second of the two or more arms may have a second mounting head provided at a second end thereof and may be pivotally mounted at its first end to the second end of the first arm by means of the first mounting head, and so forth.
- the actuating means may comprise any suitable means whereby the linkage arm may be pivoted about its pivotal mounting on the structure, and the mounting head may be rotated relative to the linkage arm.
- this may comprise electrically or hydraulically powered actuators.
- a hydraulic ram may be connected between the prime mover and the linkage arm, and another ram or swing motor may be connected between the mounting head and the linkage arm.
- the limit means may comprise any suitable means whereby the rotational motion of the mounting head relative to the linkage arm may be limited.
- this may comprise devices such as switches/valves for controlling electric/hydraulic power for operation of the mounting head actuator.
- the limit adjusting means may comprise a control system whereby the operation of the switches/valves may be varied in some predetermined ratio with respect to pivotal movement of the linkage arm.
- sensors may be used for determining the location of the linkage arm, and the switches/valves operated on the basis of signals from the sensors.
- the limit means may comprise a limit support means on which are mounted mechanical limits, the limit support means being mounted on the linkage arm so as to be movable relative thereto, thereby moving the mechanical limits.
- the limit adjusting means may comprise mechanical means for moving the limit support means relative to the linkage arm with pivotal movement of the linkage arm relative to the structure.
- the limit support means may be in the form of an orientation member with two limit stops attached thereto, the orientation member being pivotally mounted on the linkage arm such that an orientation of the limits stops relative to the linkage arm is variable with pivotal movement of the orientation member.
- the orientation member may comprise any suitable member that is able to be rotatably mounted.
- the orientation member may comprise the housing or shaft of the rotary actuator, with -li ⁇ the limits being those for limiting rotation of the shaft relative to the housing.
- the limits may comprise two limit stops un the housing which abut with opposite sides of the vane.
- the orientation member may comprise a support plate pivotally mounted to the linkage arm with the rod member or casing of the actuator is connected between the support plate and the linkage arm, the orientation member including the rod member or casing with its limit stops.
- the limit support means may comprise a mechanical stop which may be supported so as to be movable relative to the linkage arm.
- this may be in the form of a cam member having a peripheral face for providing a mechanical limit to rotation of the mounting head.
- the cam member may comprise a pivot shaft for rotatable mounting on the linkage arm such that the position of the mechanical limit whereby rotation of the mounting head is limited, is moved when the cam is rotated.
- the cam member may be mounted inside the housing so as to be rotatable relative thereto, with the peripheral face of the cam member arranged so as to provide limits to rotary motion of the vane.
- the limit adjusting means may comprise linkage means connected either directly or indirectly between the limit support means and the structure.
- Any suitable linkage means may be possible providing it enables adjustment of the position of the limit support means and hence the limits, relative to the linkage arm.
- this may comprise any one of or a combination of an electric/hydraulic actuator, gearing, or link arms.
- gearing this may comprise gears and a drive shaft extending to the limit support means, whereby rotational movement proportional to pivotal movement of the arm about the first pivot may be transmitted to the limit support means to cause movement thereof.
- the linkage means may comprise a limit actuating arm whereby linear movement proportional to pivotal movement of the linkage arm about the first pivot may be transmitted to the limit support means to cause movement thereof.
- limit support means such as a cam member rotatably mounted by means of a pivot pin
- the linkage means may be connected to the cam member so as to cause rotation thereof.
- the cam member may be provided with a crank arm connected to the pivot pin and the linkage means connected to the crank arm.
- the linkage means in this case may comprise a limit actuating arm.
- This may be pivotally mounted at one end to the structure adjacent the pivot point of the first end of the linkage arm, and pivotally mounted at another end to the crank arm, so that linear movement proportional to the pivotal movement of the linkage arm about the first pivot may be transmitted to the cam by way of the linkage arm.
- a second cam member having a second crank arm may also be provided to give a second movable limit stop for limiting the rotational motion of the mounting head in another direction, instead of having a fixed limit stop for this purpose.
- a second limit actuating arm may be pivotally mounted at one end to the structure adjacent the pivot point and on an opposite side to the pivotal mounting of the other limit actuating arm, and pivotally mounted at another end to the second crank arm, so that linear movement proportional to the pivotal movement of the linkage arm about the first pivot may also be transmitted to the second cam by way of the second linkage arm.
- this arm may be pivotally mounted at one end to the structure adjacent the pivot point of the first end of the linkage arm, and pivotally mounted at another end to the orientation member, so that linear movement proportional to the pivotal movement of the linkage arm about the first pivot may be transmitted to the orientation member by way of the linkage arm.
- the location of the mounting of the limit actuating arm to the structure for predetermined extremes of pivotal rotation of the orientation member relative to the linkage arm for predetermined extremes of pivotal rotation of the linkage arm relative to the structure may be determined by:
- the linkage means may further comprise an auxiliary arm in conjunction with the limit actuating arm to ensure that maximum moment may be applied to the orientation member at all positions of the linkage arm.
- the auxiliary arm may be pivotally mounted at one end to the structure at a predetermined point adjacent the pivot point of the first end and on an opposite side to the pivotal mounting of the limit actuating arm, and may be pivotally mounted at another end to the orientation member such that the rotatable mounting of the mounting head is disposed substantially centrally and symmetrically between the pivotal mountings of the auxiliary arm and the limit actuating arm when the linkage arm has been rotated to a position intermediate its extreme limit positions.
- Determination of the predetermined point for the pivotal mounting of the auxiliary arm on the structure may be determined such that movement of the auxiliary arm and the limit adjusting arm, with movement of the linkage arm is symmetrical about a central axis datum coincident with a central axis between the two extremes of movement of the linkage arm.
- the linkage means comprises two arms pivotally mounted on the orientation member, there may be positions of the linkage arm on either side of the central axis where binding may occur at any of the connection points. This binding may be due to a slight difference in trajectory of the pivot point for pivotal connection to the linkage arm and located on the orientation member which is supported by the auxiliary and limit actuating arms, and the pivot point located on the linkage arm for pivotal connection to the orientation member.
- the points where the auxiliary and limit actuating arms are connected to the orientation member would be chosen so that this binding was zero at the extreme limits of movement of the linkage arm, and when the position of the linkage arm corresponded with the central axis datum.
- This binding may be minimized at other positional locations of the linkage arm by suitable positioning of the auxiliary and limit actuating arm pivot points on the orientation member and on the structure, relative to the linkage arm pivot point on the orientation member and on the structure respectively.
- the linkage means may comprise one or two hydraulic rams in place of the arm or arms respectively.
- a linkage arrangement with a limit actuating arm which serves additionally as a support member of the linkage arrangement in conjunction with the linkage arm.
- the limit actuating arm may be pivotally mounted to the structure and to the limit support member such that it supports the limit support member while pivoting.
- the limit actuating arm and the linkage arm may be arranged in the form of a pantograph, formed by the structure, the limit support member and the arms themselves. Alternatively the arms may be connected to the limit support member so as to cross over intermediate the structure and the limit support member.
- the limit actuating arm or arms may be connected to the housing/shaft so that rotation of the housing/shaft relative to the linkage arm will move the mechanical stops relative to the linkage arm resulting in a change in the range of pivotal movement of the mounting head relative to the linkage arm.
- the limit adjusting arms may be either a single arm member per each linkage arm or a pair of arm members per each linkage arm.
- the limit actuating arm for the second arm may be pivotally mounted to the limit support member at the second end of the first arm, and may extend to a second limit support member rotatably mounted to the second end of the second arm.
- the mounting head may be rotatably mounted to the second end of the second arm and/or to the second limit support member.
- the implement is a backhoe or a verge mower.
- Figure 1 shows a plan view of a first embodiment of a linkage arrangement according to the invention
- Figure 2 shows various positions of the linkage arrangement of Figure 1;
- Figure 3 details a preferred mounting head suitable for use with various embodiments of the present invention;
- Figure 4 shows a schematic plan view of a linkage arrangement accordingly to the present invention, and the possible scope of operation of an implement when mounted on the linkage arrangement;
- Figure 5 shows a plan view of a second preferred embodiment of a linkage arrangement according to the present invention.
- Figure 6 shows a plan view of a third preferred embodiment of a linkage arrangement according to the present invention.
- Figure 7 shows a plan view of a fourth preferred embodiment of a linkage arrangement according to the present invention.
- Figure 8 shows the linkage arrangement of Figure 5 mounted to a prime mover, with a backhoe mounted on the mounting head;
- Figure 9 shows schematically, a method by which a point of mounting of a limit actuating arm to a structure can be determined; and Figure 10 shows a linkage arrangement according to a fifth preferred embodiment of the present invention.
- a linkage arrangement 10 for mounting on a structure such as a prime mover 12 is shown in the neutral (non-rotated) position.
- the linkage arrangement 10 includes a first linkage arm 14 pivotally mounted to the prime mover 12 at a first pivot point 16.
- a second linkage arm 18 is pivotally mounted to the first linkage arm 14 by way of a first rotary actuator 19.
- the second linkage arm 18 is fixedly attached to the housing of the actuator 19, and the shaft of the actuator is rotatably mounted on the first linkage arm 14 at a second pivot point 20.
- a mounting head in the form of a rotating head 22 is rotatably mounted to the second linkage arm 18 by way of a second rotary actuator 23.
- the rotating head 22 is fixedly attached to the housing of the actuator
- a pair of hydraulic rams 26,26' are pivotally mounted to and extend from the prime mover 12 and act on the first linkage arm 14 to cause it to pivot about the first pivot point 16. (This pivotal movement is depicted, for example, in Figures 2G and 2H).
- a first limit support member in the form of a first orientation base 28 is fixedly attached to the shaft of the first rotary actuator 19 so as to be rotatably mounted to the first linkage arm 14 at the second pivot point 20.
- the first orientation base 28 is connected to the prime mover by a first limit actuating arm 30, and a first auxiliary arm 30' which extend from respective pivot points 31, 31' adjacent the first pivot point 16 and to either side thereof, to pivot points 32, 32' on the first orientation base 28, located so that the second pivot point 20 is disposed substantially centrally and symmetrically therebetween.
- a second limit support member in the form of a second orientation base 33 is fixedly attached to the shaft of the second rotary actuator 23 so as to be rotatably mounted to the second linkage arm 18 at the third pivot point 24.
- the second orientation base 33 is connected to the first orientation base by a second limit actuating arm 35, and a second auxiliary arm 35' which extend from respective points of pivot 37, 37' on the first orientation base 28 adjacent the second pivot point 20 and to either side thereof, to respective pivot points 36, 36' located so that the third pivot point 24 is disposed substantially centrally and symmetrically therebetween.
- the first orientation base 28 is provided with rotational delimiters in the form of vanes 40.
- the second orientation base is provided with rotational delimiters on either side of a vane 44 of the rotary actuator 23 rotating within a ring sector 46 of the actuator 23 housing which is fixedly attached to the rotating head 22.
- These rotational delimiters provided by vane 44 define limits to the extent of rotational motion of the rotating arm 22 to either side of a central datum line L2 (coinciding with a central axis CA in the symmetrical configuration of Figure 1) about which the rotating head 22 pivots relative to the second arm 18.
- the ring portion 42 of the hydraulic actuator 19 is provided with vanes 48, 48' which extend inwardly from the ring portion 42 towards the second pivot point 20.
- the ring sector 46 of the hydraulic actuator 23 is provided with slew cams 50, 50' (to be described later with reference to Fig. 3) which extend inwardly from the walls of the ring sector 46 and are pivotally mounted to the housing of the actuator 23. Normally the slew cams 50,50' are rotated to butt against the casing 51 (wall of ring sector 46), to provide for maximum rotation of the rotating head 22.
- the rotating head 22 is provided with projecting arms 52, 52' for receiving an implement such as a back-hoe, verge mower or the like.
- an implement such as a back-hoe, verge mower or the like.
- the boom of the backhoe would be mounted between the arms 52, 52' (as shown in Figure 8).
- FIG. 2 various positions of the linkage arrangement are depicted.
- a central axis extending through the prime mover, first pivot point 16, (and the second and third pivot points 20, 24 when the linkage arrangement is in the neutral position) is shown and depicted as CA
- the various positions of the linkage arrangement on one side of the central axis CA can be mirrored (reproduced identically) on the other side of the axis, as shown for example by Figure 2F which is a mirror of the position shown in Figure 2D.
- Figure 2F is a mirror of the position shown in Figure 2D.
- FIGs 2A to 2E show views in which the rotating head 22 has been rotated to a position in which slew cam 50' engages rotational delimiter 44 to stop rotational travel of the rotating head 22.
- the rotational travel can be effected by operating the hydraulic actuator 23 to turn the actuator 23 housing relative to the vane 44 in either clockwise or anti-clockwise directions.
- the second arm 18 is shown pivoting about the second pivot point 20. This pivotal movement can be effected by operation of the hydraulic actuator 19 to cause the second arm 18 to pivot until vanes 48, 48' engage rotational delimiters 40', 40 respectively, arresting the movement of the second arm 18.
- pivoting of the second arm 18 about the second pivot point 20 causes pivotal motion of second limit actuating arm 35 and second auxiliary arm 35' about their respective points of pivot 37, 37'.
- the pivotal motion of the second arm 18 about the second pivot point 20 causes a change in orientation of the central datum line L2 between the limits of the second orientation base 33, with respect to the second linkage arm's longitudinal axis (denoted in Figure 2C by L2').
- L2' longitudinal axis
- FIG. 2E a view is shown in which the first linkage arm 14 has been pivoted about the first pivot point 16.
- this is achieved by extending the piston rod of hydraulic ram 26 and retracting the piston rod of hydraulic ram 26'(see Figure 1).
- the extent of pivotal motion of the first linkage arm 14 about the first pivot point 16 is limited by the extent of travel of the piston rods within their respective hydraulic rams 26, 26'.
- first linkage arm 14 As the first linkage arm 14 is pivoted about the first pivot point 16, the first limit actuating arm 30 and first auxiliary arm 30' are caused to pivot about their respective pivot points 31, 31'. Since the ends of these arms are pivotally connected at pivot points 32, 32' on the first orientation base 28, pivoting of the first linkage arm 14 about the first pivot point 16 causes a change in orientation of the central datum line LI between the limits of the first orientation base 32, with respect to the longitudinal axis of the first arm 14 (denoted in Figure 2E by LI'). Referring to Figures 2E and 2F it can be seen that the new orientation of the first orientation base 28 indicated by central datum line LI causes a changed in the extent of sweep of the second arm 18 with respect to the first arm 14 on either side of axis LI'.
- the linkage arrangement can be designed to suit a variety of applications.
- Figure 4 When an implement such as a backhoe is mounted to the rotating head 22, a variety of different sized areas (bounded by envelopes which denote the limit to which a backhoe may reach from the third pivot point 24) can be reached by a backhoe shovel, and these 5 are shown schematically in Figure 4 and Figure 8.
- Figure 4 also illustrates the potential to utilize automatic orientation of the orientation base as the linkage mechanism is turned about its respective pivots.
- arrowed lines indicate movement due to a rotary actuator, or a mechanism providing a similar function.
- Figure 4a shows a cross over linkage arrangement whereby the second arm 18 is turned relative to the first linkage arm 10 14 as the first linkage arm 14 is turned about the first pivot point 16.
- the orientation base 28 on which the rotating head 22 is mounted by means of the second arm 18 is turned relative to the first linkage arm 14 by a limit actuating arm 30 and auxiliary arm 30' which cross over intermediate the prime mover 12 and the orientation base 28 to attach to pivot points on opposite sides of the first pivot point 16.
- the first linkage arm 14 is rotated about the first pivot point 16 to one extreme. In this position the rotating head 22 may be rotated so that at either extreme, an implement attached to the rotating head 22 does not contact the prime mover 12.
- Figure 4b shows a similar linkage mechanism to that of Figure 4a with the attachment points of the limit actuating arm 30 and the auxiliary arm 30' on the prime 0 mover 12 positioned closer to the first pivot point 16.
- the rotating head 22 in this configuration has a greater range of rotation about its pivot point, and hence, to prevent an implement attached to the rotating head 22 from contacting the prime mover 12 , the limit of rotation of the first linkage arm 14 is reduced.
- Figure 4c show an arrangement with the pivot points for the limit actuating arm 30 5 and the auxiliary arm 30' positioned relative to the first pivot point 16 so that they do not cross over.
- the second linkage arm 18 is also able to rotate about the orientation base 28.
- the limits of rotation of the first linkage arm 14 and the second linkage arm 18, and the rotating head 22 are set so that when the first linkage arm 14 is at one extreme (to the left in Figure 4), an implement mounted to the rotating head 22 cannot contact the prime mover 12 throughout its range of movement.
- the orientation base 28 turns anti-clockwise as the first linkage arm 14 turns clockwise about the first pivot point 16 so that the central axis of movement of the second linkage arm 18 (central datum line) is turned relative to the axis of the first linkage arm 14 and positioned so that in the right side extreme position, an implement mounted on the rotating head 22 will not contact the prime mover 12.
- Figure 4d shows a configuration with a second orientation base 33. With this arrangement, the rotational range of the rotating head 22 may be increased whilst still ensuring that an implement mounted to the rotating head 22 will not contact the side of the prime mover 12 throughout the whole range of travel of the linkage arrangement.
- the linkage arrangement is mounted to a prime mover 12 with for example, large rear wheels (denoted as W).
- the delimiters are arranged so that full anti-clockwise travel of the rotating head 22 first linkage arm 14 and second linkage arm 18 about their respective pivot points 16, 20 and 24 results in the projecting arms 52, 52' being parallel to one side of the prime mover 12.
- an implement mounted on the rotating head 22 of the linkage arrangement can operated to either side of and adjacent the prime mover 12 without contacting the prime mover 12 (as can be seen by the mirrored arrangement in Figures 2D and 2F).
- the slew cams 50, 50' are pivotally mounted to the rotating head 22 at pivot points 60, 60' respectively.
- Each cam 50,50' is provided with a number of notches 62,62' respectively which are shaped to engage a knobs 64,64' formed on either side of the rotation delimiter 44 (shown in dotted outline in one position) which is fixedly connected to the second orientation base 36 (not shown in Figure 3).
- slew cam 50' is shown in its normal operating position, ie. butted up against the casing 51 with slew cam 50 pivoted away from the casing 51, thereby reducing the extent of rotational sweep of the rotating head 22.
- This configuration may be used for example, when a different implement is mounted on the rotating head.
- One of the notches 62,62' is selected to engage the knob 64,64' (as shown in Figure 3) and thus rotational sweep of the rotating head 22 about the second orientation base 36 can be varied to suit the type of implement mounted on the linkage arrangement.
- the slew cam configuration could be modified to include a number of operating configurations (not shown). These might include a safe, "in-use” configuration wherein the backhoe is restrained from contacting the prime mover, by limiting rotating head 22 rotational sweep, and a transporting configuration (ie.
- Figure 5 shows a second embodiment of the linkage mechanism according to the present invention in which the first limit actuating arms 30 is replaced by a single hydraulic ram 68 pivotally mounted on the prime mover 12 adjacent the first pivot point
- the piston rod of the hydraulic ram 68 is pivotally connected to the first orientation base 28 at a side pivot point 70.
- the rotary actuator 32 of the embodiment of Figure 1 is replaced by a pair of respective hydraulic rams 72, 72'.
- Each ram 72, 72' is pivotally mounted between an attachment member 65 formed integral with the second linkage arm 18 and the first orientation base 28 at respective pivot points 73, 73' and 74, 74'.
- the rams 72,72' thus provide a similar function to that of the rotary actuator 32, to cause the second linkage arm 18 to pivot about the second pivot point 20.
- Figure 5 would allow for a greater variation in the position of the second orientation base with respect to the second arm due to the use of the hydraulic ram 68 instead of a fixed length limit actuating arm.
- the position of the first orientation base 28 in Figure 5 can be varied independently of the first linkage arm 14 (ie. the position of the orientation base 28 can be changed by either pivoting the first linkage arm 14 or by operation of the ram 68).
- FIG. 6 a third embodiment of the linkage arrangement according to the present invention is depicted, in which the arrangement of the first linkage arm 14 is similar to that shown in Figure 5.
- the first orientation base 28 is made integral with the second arm 18 to form an L-shaped member 74, and variation in orientation of the central datum line LI relative to the central axis LI' of the first linkage arm 14 is varied by turning the L-shaped member 74 about the second pivot point 20.
- extension of the hydraulic ram 68 causes the L-shaped member 74 to rotate about the second pivot point 20 in a clockwise direction.
- Retraction of the ram 68 causes the L-shaped member 74 to rotate about the second pivot point 20 in an anti-clockwise direction.
- the hydraulic ram 68 also functions as a limit actuating arm.
- a change in position of the L-shaped member 74 with respect to the first arm 14 occurs (ie. the L-shaped member 74 pivots about the second pivot point 20).
- the length of the hydraulic ram 68 (as shown in Figures 6B,6C) before and or during motion of the first arm 14 about pivot point 16, a variety of positions of the rotating head 22 can be achieved during and/or at the termination of motion of the first arm 14.
- rotating head 22 can be mounted at the third pivot point 24 and its rotational sweep can be controlled such that any implement mounted to the rotating head
- an orientation base 80 is pivotally mounted to the prime mover by crossover (interwoven) linkage arms 82 and 82'.
- the linkage arms 82, 82' are pivotally mounted to the prime mover 12 at pivot points 83 and 83' respectively, and to respective opposite ends of the orientation base 80 at pivot points 84, 84'.
- one of the linkage arms (82' in the following) can be considered as a limit actuating arm which is also adapted to function as a support arm for the linkage arrangement.
- Hydraulic rams 85 and 85' are pivotally mounted to the prime mover 12 and extend to and are pivotally mounted to respective opposite ends of the orientation base 80 at the pivot points 84, 84'.
- the rotating head 22 is rotatably mounted to the orientation base 80 in a similar manner to the aforementioned embodiments and is pivotal about a central datum line LI.
- Figures 7A to 7D also show how a change of ratio in the rotation of the orientation base 80 with respect to the total slew of the linkage arms 82, 82' about the prime mover can be achieved. This is achieved by changing the position of mounting of the crossover linkage arms 82, 82' and hydraulic rams 85,85' to the orientation base 80 at various mounting points 86 ( Figure 7E). This alteration of orientation ratio also changes the rotation of the orientation base 80 and therefore mounting head 22 with respect to the prime mover.
- the rotating head 22 can be positioned such that the projecting arms 52, 52' of the rotating head 22 remain parallel to the side of the prime mover 12.
- This positioning might be employed during transportation of the prime mover 12, and could be obtained by employing the slew cam configuration as described earlier; (ie the positioning could correspond with a configuration in which the slew cams abutted against the casing 51). Also, when certain implements are operating on the linkage arrangement with this particular positioning, it may not necessarily be dangerous to the prime mover 12.
- FIG 8 the linkage arrangement of Figure 5 is shown with a backhoe mounted thereon.
- the boom 90 of the backhoe is rotatably mounted on the rotating head 22 to slew in the vertical plane.
- Figure 8A depicts a rear view of the prime mover 12, wherein a backhoe is shown digging adjacent to and laterally of the prime mover 12 and dumping at some distance from the prime mover 12.
- Figure 8B shows the extent of digging achievable with the linkage arrangement of the present invention when a backhoe is mounted thereon. This is depicted as area 92 bounded by envelope 92A.
- the first orientation base 28 is pivotally mounted at the other end of the first linkage arm 14 at the second pivot point 20.
- the limit actuating arm 30 (a plurality of actuating arms are shown in Figure 9 A, each of which would correspond to various orientation base extreme positions) is pivotally mounted to the prime mover 12 and extends to the orientation base 28 to be mounted at reference point 100.
- the ratio of rotation of the orientation base about the first linkage arm 14, to rotation of the first linkage arm 14 relative to the prime mover 12 is predetermined, and varying ratios are depicted schematically as a, b, c, d, etc in Figure 9A
- a different point of mounting of the limit actuating arm 30 to the prime mover 12 is required.
- the corresponding points of mounting are shown more clearly in Figure 9B.
- Step A - Linkage arm 14 is pivoted in a clockwise direction about pivot point 16 to position A as shown.
- a preselected extent of rotation of the orientation member 28 about the second pivot point 20 is determined and shown as reference point 100 taking position x.
- Position x is recorded.
- Step B - Linkage arm 14 is rotated, until it extends perpendicularly from the back of the prime mover 12, to position B corresponding with the central axis CA
- the limit actuating arm 30 rotates about second pivot point 20 until it assumes the positions shown.
- the position of reference point 100 is recorded (and is shown as y).
- Step C Linkage arm 14 is pivoted about the first pivot point 16 in an anti-clockwise direction until it reaches position C.
- the extent of pivotal motion of linkage arm 14 in the anti-clockwise direction from position B to position C corresponds with the extend of pivotal motion in the clockwise direction from position B to position A.
- the orientation member 28 rotates about the second pivot point 20 until it assumes the position as shown (a mirror image of the orientation at A).
- the position of reference point 100 is recorded (and is shown as z).
- Step D Once the positions x, y and z have been established, an arc of a circle is drawn to pass through these three positions. The centre of the circle is determined and its point of correspondence with the prime mover 12 is located. This point becomes the location for mounting of the limit actuating arm 30 to the prime mover 12 and is depicted in Figure 9C as L.
- the orientation base 28 is not mounted to the linkage arm 14 at the point at which a straight line extending between its ends crosses (or intersects) linkage arm 14. Instead, the mounting to the linkage arm 14 is off-set to the second pivot point 20. Thus, in the case where a limit actuating arm and an auxiliary arm are mounted to respective ends of the orientation base, the off-set mounting of the orientation base 28 minimizes binding at the pivotal connections of the limit actuating arm and the auxiliary arm to the orientation base 28 during pivotal motion of the linkage arm 14 about the first pivot point 16.
- the limit support means in this embodiment comprises a pair of cams 93, 93' of a similar design and function to the slew cams 50, 50' illustrated in Figure 3.
- the cams 93, 93' are rotatably mounted by means of pivot shafts 95, 95' inside a housing 94 of a rotary actuator 96 which is fixedly attached to the first linkage arm 14, and the second linkage arm 18 is fixedly attached to the shaft 97 of the rotary actuator 96.
- Peripheral faces of the cams 93, 93' are arranged so as to provide limits to the rotary motion of a vane 98 formed integral with the shaft 97.
- the cams 93, 93' are provided with crank arms 99, 99' connected to the pivot pins 95, 95', and limit actuating arms 102, 102' are pivotally connected at their respective first ends to the crank arms 99, 99', and at their respective second ends to the structure at pivot points 104, 104' adjacent to and on either side of the first pivot point 16 of the linkage arm 14. With this arrangement linear movement proportional to the pivotal movement of the linkage arm 14 about the first pivot 16 is transmitted to the cams 93, 93' by way of the limit actuating arms 102, 102'.
- cams 93, 93' are rotated relative to the housing 94 so that the extent of rotational motion of the second linkage arm 18 to either side of a central datum line LI about which the second linkage arm 18 pivots is varied, depending on the profile of the cams 93, 93', the location of the various pivot points and the lengths of the limit actuating arms 102, 102' and the crank arms 99, 99'. Since in this embodiment two cams 93, 93' are used instead of one, these variables may be set so that the orientation of the central datum line LI with respect to the orientation of the central axis LI' remains constant, and only the extent of rotational motion of the second linkage arm 18 is varied. However it is generally envisaged that in most applications the orientation of the central datum line LI would also vary with respect to the orientation of the central axis LI'.
- an additional rotating head 22 may be provided at the end of the second linkage arm 18, and fitted with either cam or orientation base limit mounting means which are linked back to the prime mover 12.
- the cams 93, 93' fixed to the shafts 95, 95' may be eliminated so that the limits to rotation of the actuator 96 are not varied with pivotal movement of the first linkage arm 14, the limits to rotational motion of the mounting head 22 being varied only by cams or an orientation base provided at its mounting to the second linkage arm 18.
- the linkage arrangement of the present invention a number of advantages become apparent, when for example, the linkage arrangement is mounted to a prime mover.
- a backhoe is mounted on the linkage arrangement it is possible to excavate almost entirely around a prime mover, without the need for moving and repositioning the prime mover.
- the prime mover and a human operator of the backhoe are not endangered.
- This ability is available with a variation of for example 45 degrees in orientation, with 22.5 degrees of freedom to each side, for cleaning off hanging shoulders or for correction after the prime mover had been pulled from its stationary position (unless the work requires the linkage to be positioned against the limits on one side).
- the arrangement makes it possible to extend the length and shape of trenches, holes, excavation pits, etc.
- the linkage mechanism of the present invention could be appropriately controlled so that the mower could readily operate to the side and above of both sides of the prime mover, and for example, in the case of hedge trimming, the mechanism movement could be controlled where hedge cuttings of various shapes were desired.
- Verge mowers could be mounted to the front and rear of a prime mover, to be operated one on either side of the prime mover when traveling. An operator could be positioned so that the rear-mounted verge mower could be operating forward of the operator in the direction of the prime-mover travel, thereby enabling two sides or passes of, for example, a roadway to be mowed simultaneously.
- the operator would have a simultaneous view of the direction of travel, the approaching terrain and implements mounted on the prime mover, and this would facilitate controlled arrangement of implements.
- the arrangement of the present invention provides the added advantage of operator protection from both sides.
- the linkage arrangement of the present invention can facilitate an implement breakaway system.
- an implement such as a verge mower
- the arrangement breaks away from its forward position about the pivot point and swings back parallel to the side of the prime mover to prevent damage to the implement arm, cabin or prime mover generally.
- a prime mover could also be fitted with linkage mechanisms according to the present invention at both the front and rear, accommodating for example a backhoe at the rear and a shovel at the front of the prime mover.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6508927A JPH08501848A (en) | 1992-10-02 | 1993-10-01 | Link mechanism |
EP93922083A EP0663033A4 (en) | 1992-10-02 | 1993-10-01 | Linkage arrangement. |
AU51199/93A AU687757B2 (en) | 1992-10-02 | 1993-10-01 | Linkage arrangement |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NZ24461092 | 1992-10-02 | ||
NZ244610 | 1992-10-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1994008099A1 true WO1994008099A1 (en) | 1994-04-14 |
Family
ID=19924127
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/NZ1993/000089 WO1994008099A1 (en) | 1992-10-02 | 1993-10-01 | Linkage arrangement |
Country Status (4)
Country | Link |
---|---|
EP (2) | EP0663033A4 (en) |
JP (1) | JPH08501848A (en) |
AU (2) | AU687757B2 (en) |
WO (1) | WO1994008099A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU2006248196B2 (en) | 2005-05-16 | 2011-06-30 | Terminator Ip Sa | Improved breaking machine |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU1494183A (en) * | 1982-05-25 | 1983-12-01 | Andrew W. Millwood | Excavator bucket coupling adaptor |
US4958981A (en) * | 1988-12-20 | 1990-09-25 | Masatoshi Uchihashi | Attachment connector assembly for hydraulic shovel type excavator |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL258631A (en) | 1960-02-12 | |||
GB1054382A (en) | 1964-08-19 | |||
DE1784347A1 (en) * | 1968-05-30 | 1971-02-25 | Lars Huellert | Excavation and loading device |
US4049139A (en) | 1976-02-25 | 1977-09-20 | Caterpillar Tractor Co. | Backhoe with multi-movement capabilities |
IT1129367B (en) | 1980-11-04 | 1986-06-04 | Vema Spa | ARTICULATED ARM FOR EXCAVATOR MACHINES |
-
1993
- 1993-10-01 AU AU51199/93A patent/AU687757B2/en not_active Ceased
- 1993-10-01 JP JP6508927A patent/JPH08501848A/en active Pending
- 1993-10-01 EP EP93922083A patent/EP0663033A4/en not_active Withdrawn
- 1993-10-01 WO PCT/NZ1993/000089 patent/WO1994008099A1/en not_active Application Discontinuation
- 1993-10-01 EP EP00107943A patent/EP1013835A2/en not_active Withdrawn
-
1997
- 1997-12-02 AU AU46832/97A patent/AU4683297A/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU1494183A (en) * | 1982-05-25 | 1983-12-01 | Andrew W. Millwood | Excavator bucket coupling adaptor |
US4958981A (en) * | 1988-12-20 | 1990-09-25 | Masatoshi Uchihashi | Attachment connector assembly for hydraulic shovel type excavator |
Non-Patent Citations (1)
Title |
---|
See also references of EP0663033A4 * |
Also Published As
Publication number | Publication date |
---|---|
JPH08501848A (en) | 1996-02-27 |
EP0663033A1 (en) | 1995-07-19 |
EP1013835A2 (en) | 2000-06-28 |
AU4683297A (en) | 1998-02-26 |
AU687757B2 (en) | 1998-03-05 |
EP0663033A4 (en) | 1996-12-04 |
AU5119993A (en) | 1994-04-26 |
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