A lift linkage assembly for a work machine having a work tool. The lift linkage assembly includes a frame, a boom arm, an upper link, a lower link, and a hydraulic actuator. The boom arm is configured to be pivotally coupled to the work tool and has a surface that defines a longitudinal axis. The up
A lift linkage assembly for a work machine having a work tool. The lift linkage assembly includes a frame, a boom arm, an upper link, a lower link, and a hydraulic actuator. The boom arm is configured to be pivotally coupled to the work tool and has a surface that defines a longitudinal axis. The upper link has a first end pivotally coupled to the frame and a second end pivotally coupled to the boom arm. The lower link has a first end pivotally coupled to the frame and a second end pivotally coupled to the boom arm. The hydraulic actuator has a rod that is pivotally coupled to the boom arm and moves between a retracted position and an extended position. The upper link, lower link, and hydraulic actuator are each spaced from the longitudinal axis.
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1. A lift linkage assembly for a work machine having a work tool, comprising: a frame;a centerline longitudinally defined along an interior of the work machine;a boom arm configured to be pivotally coupled to the work tool, the boom arm defining an inner surface and a longitudinal axis and being con
1. A lift linkage assembly for a work machine having a work tool, comprising: a frame;a centerline longitudinally defined along an interior of the work machine;a boom arm configured to be pivotally coupled to the work tool, the boom arm defining an inner surface and a longitudinal axis and being configured to move the work tool from a first position to a second position along a lift path;an upper link pivotally coupled at one end to the frame and at an opposite end to the boom arm, where the upper link is pivotally coupled to the boom arm at a first location;a lower link pivotally coupled at one end to the frame and at an opposite end to the boom arm, where the lower link is pivotally coupled to the boom arm at a second location; anda hydraulic actuator pivotally coupled at one end to the frame and at an opposite end to the boom arm, where the hydraulic actuator is pivotally coupled to the boom arm at a third location;wherein the upper link comprises a transverse bend away from the inner surface towards the centerline and defined between the first end and the second end;wherein, the upper link, lower link, and hydraulic actuator are spaced from the longitudinal axis;further wherein: the first location and second location are spaced from one another by a first distance, the second location and third location are spaced from one another by a second distance, and the first location and third location are spaced from one another by a third distance;the first distance is at least twice the third distance; andthe second distance is at least twice the third distance. 2. The lift linkage assembly of claim 1, wherein the upper link is offset from the longitudinal axis by a first offset distance and the hydraulic actuator is offset from the longitudinal axis by a second offset distance, where the first offset distance is greater than the second offset distance. 3. The lift linkage assembly of claim 2, wherein the lower link is offset from the longitudinal axis by a third offset distance, where the third offset distance is less than the first offset distance. 4. The lift linkage assembly of claim 1, wherein: the upper link comprises a rear coupling point defined between a first end of the upper link and a second end thereof; andthe transverse bend is defined between the second end and the rear coupling point. 5. The lift linkage assembly of claim 1, wherein the first distance and second distance are at least three times the third distance. 6. The lift linkage assembly of claim 1, further comprising a second hydraulic actuator pivotally coupled at one end to the boom arm, wherein the first and second hydraulic actuators include a rod that extends between a retracted position and an extended position; wherein, movement of each rod between the retracted position and extended position and pivotal movement of the upper link, lower link and first hydraulic actuator relative to the boom arm is adapted to induce movement of the work tool along the lift path between the first position and the second position. 7. The lift linkage assembly of claim 1, wherein the movement of the work tool along the lift path defines a lift curve relative to a hinge pin connection coupling the work tool and boom arm to one another, the lift curve having at least a first region corresponding to the first position, a second region corresponding to the second position, and a third region corresponding to a position defined between the first position and second position, where the lift curve has a first defined slope in the first region, a second defined slope in the second region, and a third defined slope in the third region such that the first slope and second slope are greater than the third slope. 8. A linkage assembly for a work machine, comprising: a frame;a centerline longitudinally defined along an interior of the work machine;a work tool coupled to the frame, the work tool operably controlled to perform a work function;a boom arm defining an inner surface pivotally coupled to the work tool and configured to move the work tool from a first position to a second position along a lift path;a first link having a first end pivotally coupled to the frame and a second end pivotally coupled to the boom arm, the first link being pivotally coupled to the boom arm at a first location;a second link having a first end pivotally coupled to the frame and a second end pivotally coupled to the boom arm, the second link being pivotally coupled to the boom arm at a second location, where the second link includes a transverse bend away from the inner surface toward the centerline and defined therein between the first end and the second end; anda hydraulic actuator having a rod that extends between a retracted position and an extended position, where the hydraulic actuator is pivotally coupled to the frame and the rod is pivotally coupled to the boom arm at a third location;wherein, the first location and second location are spaced from one another by a first distance, the second location and third location are spaced from one another by a second distance, and the first location and third location are spaced from one another by a third distance;wherein, the first distance is at least twice the third distance; andthe second distance is at least twice the third distance;wherein, the first link, second link, and hydraulic actuator are spaced from a longitudinal axis defined by the boom arm. 9. The linkage assembly of claim 8, wherein the second link is offset from the longitudinal axis towards the centerline by a first offset distance and the hydraulic actuator is offset from the longitudinal axis towards the centerline by a second offset distance, where the first offset distance is greater than the second offset distance. 10. The linkage assembly of claim 9, wherein the first link is offset from the longitudinal axis towards the centerline by a third offset distance, where the third offset distance is less than the first offset distance. 11. The linkage assembly of claim 8, wherein the first distance and second distance are at least three times the third distance. 12. The linkage assembly of claim 8, further comprising a second hydraulic actuator pivotally coupled at one end to the boom arm, wherein the second hydraulic actuator includes a rod that extends between a retracted position and an extended position; wherein, movement of each rod of the first and second hydraulic actuators between the retracted position and extended position and pivotal movement of the first link, second link and first hydraulic actuator relative to the boom arm is adapted to induce movement of the work tool along the lift path between the first position and the second position. 13. The linkage assembly of claim 12, wherein the movement of the work tool along the lift path defines a lift curve relative to a hinge pin connection coupling the work tool and boom arm to one another, the lift curve having at least a first region corresponding to the first position, a second region corresponding to the second position, and a third region corresponding to a position defined between the first position and second position, where the lift curve has a first defined slope in the first region, a second defined slope in the second region, and a third defined slope in the third region such that the first slope and second slope are greater than the third slope. 14. The linkage assembly of claim 1, wherein the hydraulic actuator comprises a rod that extends between a retracted position and an extended position, where the rod is pivotally coupled to the boom arm at the third location. 15. The lift linkage assembly of claim 14, wherein the upper link comprises a transverse bend defined therein between the first end and the second end.
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이 특허에 인용된 특허 (9)
Hurlburt Joseph C. (Leola PA), Anti-lowering device for a boom loader.
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