JP2006335530A - Lift device for work - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lift device for work, capable of easily and safely performing conveyance and lifting/lowering of a mechanism component when performing work for attaching/detaching the mechanism components assembled to a machine body such as a vehicle in the erect state, and of contributing to reduction of maintenance work by a worker and safety of the work. <P>SOLUTION: In a front part of a liftable/lowerable and runnable lifter of a lift device main body, a clamper detachably holding the mechanism component assembled to the machine main body, such as a clutch cover and a flywheel, from an approximately horizontal direction in the assembled posture is provided. The clamper extends forwardly, changes its position from a position to clamp the mechanism component and a position to open the mechanism component, and has a plurality of clamp claws fixed in the clamp position. The lift device for work is provided with a posture adjustment member which adjusts an angle of the posture of the mechanism component clamped by the clamp claws by extending to the same direction as that of the clamp claws to press the surface of the mechanism component. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is mainly used for transporting and moving up and down mechanical parts having relatively heavy weight such as clutch covers and flywheels of large trucks from the automobile body. The present invention relates to a work lift device.

When maintaining a large lorry, the vehicle is lifted to a certain height with a jack device, and various mechanical parts are exchanged at the height. Among these various mechanical parts, for example, the clutch cover and the flywheel have a weight of about several tens of kg. Conventionally, there is no dedicated cargo handling machine that handles these heavy parts, and it is the actual situation that a clutch cover or flywheel having a weight of about several tens of kg is removed from the automobile body or assembled by two persons.
The replacement or maintenance work of such heavy mechanical parts enters the lower side of the vehicle or is performed at a predetermined height position, so that not only requires considerable labor from the mechanic, but also the mechanic's back and There is also a risk of damaging the spine. It is also extremely dangerous to inadvertently drop a part from a high position.

As a lifter for raising and lowering the mechanism parts of an ordinary vehicle, there is a technique described in Patent Document 1. This technology is for raising and lowering a subframe on which a vehicle engine is mounted. A pedestal is provided at the tip of a piston rod of a hydraulic cylinder, and the pedestal is provided with two piercing hook holes at the bottom of the subframe. A pointed pin is erected.
Moreover, there exists a technique described in patent document 2 or 3 in the lifter as a general general purpose cargo handling machine, for example. These all employ a pantograph-like lift mechanism, and a lifting platform is installed on top of the lift mechanism.
Japanese Patent Laid-Open No. 2003-246592 JP 10-211182 A JP 2003-20196 A

Although the technology described in Patent Document 1 is a dedicated lifting device for automobile mechanism parts, it is intended to simply raise and lower the mechanism parts in the vertical direction. In this respect, it is not essentially different from the lift mechanism of the techniques of Patent Documents 2 and 3.
The clutch cover and the flywheel are disk-like mechanical parts, and are assembled to the automobile body from the horizontal direction while standing in the radial direction, that is, in a standing state. Therefore, the techniques described in Patent Documents 1 to 3 cannot hold these parts, and are not suitable for maintenance work that requires raising and lowering and transporting mechanism parts.
Further, some of the mechanical parts of the vehicle are assembled with an angle with respect to the horizontal axis, and the conventional technology can hardly cope with the transportation and raising and lowering of the mechanical parts when they are removed and attached.

The present invention can easily and safely transport and elevate mechanical parts when attaching and removing mechanical parts assembled in a standing state on a machine body such as a vehicle. An object of the present invention is to provide a work lifter device that can contribute to reduction and work safety.
Another object of the present invention is to provide a work lifter device that can be easily and safely disassembled and reassembled even for mechanical parts assembled at an angle with respect to the horizontal axis of the machine body. It is to provide.
Furthermore, another object of the present invention is to provide a work lifter device that can reliably prevent the lifter from being lowered at an arbitrary lift position in addition to the above object.

The present invention has the following configuration in order to achieve the above-described object.
That is, according to the first aspect of the present invention, mechanical parts such as a clutch cover and a flywheel that are assembled to the machine main body can be attached and detached from the front of the lifter of the lift device main body that can move up and down and can be detached from the substantially horizontal direction. It is provided with a clamper to be held. The clamper has a plurality of clamp claws that extend forward, are displaced to a position for clamping the mechanical component, and a position to be released, and are fixed at the clamp position.
According to a second aspect of the present invention, in addition to the clamp pawl described in the first aspect, the clamper extends in the same direction as the clamp pawl and presses the surface of the mechanical part, whereby the posture of the mechanical component clamped by the clamp pawl is angled. A posture adjusting member to be adjusted.
According to a third aspect of the present invention, in the working lift device according to the first or second aspect, the lift device body has the following configuration. The lift device main body includes a base that can travel, a lifter that is on the base and is lifted and lowered by the lift mechanism, and a stopper mechanism that prevents the lifter from descending. The stopper mechanism includes a stopper lever that is pivotally supported on the side surface of the lifter and has a fixed tooth at the lower end, and a rack that is provided on the base and can mesh with the fixed tooth of the stopper lever. The stopper lever and the rack are engaged with each other at positions where the rack and the fixed teeth are different according to the lift position of the lifter to prevent the lifter from being lowered.

The clamp claw of the clamper is appropriately designed to have a structure that can be clamped according to the structure of the mechanical component to be held. Depending on the type and structure of the mechanical component, the clamping claw may be displaced inwardly from the expanded state to the inward direction, instead of being expanded and clamped from the inside to the outside. .
The posture adjusting member is optimally a member that extends forward from the lifter in parallel with the clamp pawl and presses the surface of the mechanical component, for example, an adjusting bolt having a rotatable washer at the tip. The posture adjustment member presses the upper and lower surfaces of the mechanical part clamped by the clamping claws, for example, by a non-uniform length by the required inclination angle of the mechanical part, thereby tilting the mechanical part to a predetermined forward or backward inclination. Hold in posture.

The invention according to claims 1 and 2 does not limit the specific structure or mechanism of the lifter. When the lifter having the configuration according to claim 3 is used, the stopper lever has a fixing means that is detachably fixed to the side surface of the lifter when the fixed lever is rotated to a position where the fixed tooth is not engaged with the rack. good.
As a means for fixing the stopper lever, there can be considered one in which the tip of the plunger protruding from the back surface of the stopper lever is fitted into a recess provided on the side surface of the lifter by the biasing force of a spring.

According to the present invention, the mechanical parts are held from the substantially horizontal direction in the assembled posture by the plurality of clamp claws of the clamper provided at the front part of the lifter that can be moved up and down, so that the clutch cover, the flywheel, etc. When disassembling and assembling the mechanical parts, this kind of mechanical parts can be transported and lifted up and down as they are, and it is no longer necessary for workers to move, lift and lower with the mechanical parts. It can be done relatively easily and safely.

According to the second aspect of the present invention, since the clamper has not only the clamp claw but also the posture adjusting member that adjusts the posture of the clamped mechanical component, the angle of the machine body is added to the above effect. As for the mechanical parts assembled by attaching, the posture correction can be easily performed, and disassembly and reassembly can be easily and safely performed.

According to the invention of claim 3, as a stopper mechanism for preventing the lifter from descending, a stopper lever having a fixed tooth at the lower end and a rack that can be engaged with the fixed tooth are provided, and the lifter is moved up and down. Accordingly, since the rack and the fixed teeth are engaged at different positions to prevent the lifter from descending, in addition to the effects described above, the lifter does not descend unexpectedly, and the lifter can be securely moved at any lifting position. Can prevent the descent.

According to the fourth aspect of the invention, the stopper mechanism is released because the stopper lever is detachably fixed to the side surface of the lifter when the fixed tooth is rotated to a position where it does not mesh with the rack. Occasionally, the fixed gear at the tip of the stopper lever is not engaged with the rack unexpectedly, preventing the lifter 2 from being lowered.

Hereinafter, the best mode for carrying out the present invention will be described in detail together with the illustrated embodiments.
FIG. 1 is a schematic side view showing an embodiment of a working lift device according to the present invention, and shows a state where a lifter 2 is raised and a stopper mechanism 4 is operated.
2 is an enlarged view of part A in FIG. 1, FIG. 3 is a side view of the lifter 2 in a lower position than FIG. 1 and the stopper mechanism 4 is released, and FIG. 4 is an enlarged view of part B in FIG. 5 is an enlarged sectional view taken along the line CC of FIG.

The working lift device is configured by mounting a lifter 2 and a clamper 5 on a base 1.
The base 1 has free casters 7 and 7 at four places, front, rear, left and right, and can move and move in an arbitrary direction.

The lifter 2 is disposed on the base 1, and the lifting platform 2 a is moved up and down by the lift mechanism 3.
The lift mechanism 3 includes two sets of links, a lower link 8 and an upper link 9 that are connected to each other. Each of the links 8 and 9 is composed of two links (8a, 8b, 9a, 9b) connected in an X shape on the left and right (in the figure, only the link on the front side is shown).

  The lower end of one link (right inclined link 8a in the figure) of the lower link 8 is rotatably connected to a shaft of a roller capable of traveling along a guide rail 36 disposed on the base. The lower end of the other link 8 b of the lower link 8 is pivotally supported by a shaft fixed near the rear end of the base 1.

  In the upper link 9 whose lower end is pivotally supported by the upper end of the lower link, the upper end of one link 9a is rotatably connected to the shaft of the roller. The roller can run in the length direction of the lifting platform 2a. The upper end of the other link 9b is pivotally supported by a shaft fixed near the rear end of the lifting platform.

Reference numeral 10 in the figure is a hydraulic cylinder as an actuator for driving the lift mechanism 3, and the tip of the plunger 12 that moves forward and backward is pivotally supported in the vicinity of the center of the other link (left inclined link in the figure) of the lower link. The bottom portion of the hydraulic cylinder 10 is pivotally supported by the lower portion of the one link (the right tilt link in the figure) of the lower link via the bracket 11.
13 is a hydraulic pump attached to the rear part of the base, and by reciprocating the lever 14, oil is pumped from an oil tank (not shown) to the hydraulic cylinder 10 to extend the plunger 12. Further, by opening the relief valve of the hydraulic pump with the operation handle 15, the oil returns to the oil tank and the plunger 12 is drawn into the hydraulic cylinder 10. As the plunger of the hydraulic cylinder 11 moves back and forth, the two links 8a and 8b of the lower link change the X-shaped crossing angle with the central pivot as a fulcrum. In conjunction with this, the upper platform 2a is also moved up and down by changing the crossing angle of the upper link in the same manner.

Reference numeral 4 denotes a stopper mechanism for preventing the lifter from unexpectedly descending due to, for example, oil leakage from the hydraulic circuit.
The stopper mechanism 4 has a stopper lever 18 rotatably connected to the pivot 8 c of the lower link 8. A fan-shaped fixed tooth 19 is attached to the lower end of the stopper lever 18. Further, as shown in the cross-sectional view of FIG. 5, the upper end portion of the stopper lever 18 is provided with a handle 22 on the front surface side and a spacer pin 31 on the rear surface side. The spacer pin 31 maintains a required distance between the stopper lever 18 and the surface of the one link 8a.

Referring to FIG. 5, reference numeral 21 is a stopper holder attached so as to penetrate from the front surface side to the back surface side of the stopper lever 18, and a spring 33 is attached to a plunger 32 having a knob 34, and the biasing force of this spring Thus, the front end of the plunger 32 protrudes from the back surface of the stopper lever 18.
On the other hand, a concave portion 30 into which the plunger tip is fitted is formed on the surface of the one link 8a of the upper link facing the plunger tip of the stopper holder 21.

Therefore, the stopper lever 18 is held at a position along the surface of the link 8a by rotating the stopper lever 18 to a position where the tip of the plunger can be fitted into the recess 30 of the link 8a. To release the holding state, the knob 34 of the plunger 32 is pulled forward against the urging force of the spring 33, the plunger tip is detached from the recess 18, and the stopper lever 18 is rotated by the handle 22 to shift the position. That's fine.
A handle 17 is provided at the rear of the base 1 so that a person can push and pull the base 1.

Reference numeral 20 in the figure is a rack provided along the length direction of the base 1, and has teeth that can mesh with the fixed teeth 19 at the tip of the stopper lever.
In FIG. 1 and FIG. 2, the stopper lever 18 is released from the stopper holder 21, and the fixed tooth 19 at the tip is engaged with the rack 20. In this state, the stopper lever 18 supports the lower link 8 from below, and the lifter 2 does not unexpectedly descend even if oil leakage occurs in the hydraulic circuit including the hydraulic pump 13 and the hydraulic cylinder 10. The meshing of the fixed teeth 19 and the rack 20 can be performed at an arbitrary height position of the lifter 2 by changing the inclination angle of the stopper lever 18. That is, the stopper lever and the rack are engaged at positions where the rack and the fixed teeth are different according to the lift position of the lifter to prevent the lifter from being lowered.

  3 and 4 show a state in which the mesh between the fixed tooth 19 at the tip of the stopper lever and the rack 20 is released, and the stopper lever 18 is held on the side surface of the link 8a by the stopper holder 21. FIG. When the lifter 2 is moved up and down by driving the hydraulic pump 13 or opening the release valve, it is performed in this state. The fitting relationship between the plunger tip of the stopper holder 21 and the recess of the link 8a is as described above.

  As shown in FIGS. 1, 3, and 6, a mechanical part “a” such as a clutch cover or a flywheel of a large lorry is held at the front end of the lifter 2 so as to be detachable from a substantially horizontal direction while being assembled. A clamper 5 is attached via a bracket 24.

The clamper 5 includes a pair of left and right clamp claws 26 and 26 extending horizontally toward the front. The clamp claw 26 has an outward hook at the tip, and the claw drive unit 25 fixed to the bracket 24 opens the mechanism part a close to the position where the mechanism part a is clamped apart from each other. Displace to position.
The claw drive unit 25 is configured to rotatably support a screw shaft (not shown) along the longitudinal direction (vertical direction in FIG. 6) in the housing. The screw shaft is threaded with the same lead and pitch in opposite directions from the center to both ends. Both ends of the screw shaft protrude from both ends of the housing of the claw drive unit 25, and the portions are the wrench hooks 28 and 28. The clamp claws 26, 26 are formed with female screws at the base end portions, and these female screws are respectively screwed into both side ends of the screw shaft. Therefore, the clamp claws 26 and 26 are moved in equal amounts in the opposite directions by rotating the wrench hooks 28 and 28 with the wrench.

The clamp pawl hooks a hook at the tip at the clamp position on the inner peripheral portion of the boss portion surface side of a mechanical part a such as a clutch cover or a flywheel of a large truck, and holds them.

Reference numerals 29 in the figure are posture correction bolts, and are provided in a pair vertically in a direction orthogonal to the direction in which the clamp claws 26 and 26 face each other. The posture correcting bolt 29 is formed of a long butterfly bolt, screwed into each end of a bracket 27 with a reinforcing rib protruding from the housing of the claw drive unit 25 on both sides, and rotating the butterfly-shaped head at hand, The protrusion length with respect to 27 can be adjusted. A rotatable washer 29 a is attached to the tip of the attitude correction bolt 29. The washer 29a presses the surface of the mechanism component a to adjust the angle of the posture of the mechanism component a.
For example, even if the mechanical component a is held by the pair of clamp claws 26, 26, the mechanical component a is easily tilted depending on the structure of the clamp because it is supported at two locations. In that case, if the surface of the mechanism part a is pushed equally by the washers 29a of the pair of posture correction bolts 29 and 29 arranged facing each other in a direction orthogonal to the pair of clamp claws, the clamped mechanism part a is supported substantially vertically. it can.
Further, in the case of a mechanical component that is assembled with an angle with respect to the horizontal axis of the machine body, the original posture of the mechanical component a is inclined by the angle. By projecting one of the posture correction bolts 29 by a required amount from the other, the mechanical component a can be held in its original posture, and this type of mechanical component can be assembled and removed accurately. it can.

The mechanical part a held by the clamper 5 moves horizontally by running the base 1 of the working lift device, and moves up and down by raising and lowering the lifter.
It should be noted that other mechanical components can be placed on the lifting platform and moved or lifted.

The above-described embodiments of the present invention show examples of the present invention and are not limited to these configurations. For example, various other configurations can be adopted as long as the shape of the clamp claw, the structure of the clamp, or the posture correcting member can exhibit the above-described action of the invention.
Further, an electric hydraulic pump instead of a manual hydraulic pump can be used as an actuator for driving the lift mechanism, or the actuator itself can be replaced with a screw mechanism.
The mechanical parts to handle are not limited to clutch covers and flywheels of large trucks, but are effective for various mechanical body mechanical parts that can be attached and detached from the horizontal direction.

The side view of the state which shows one Example of the working lift apparatus by this invention, and the lifter went up and the stopper mechanism worked. The A section enlarged view of FIG. FIG. 2 is a side view of the lift device of FIG. 1 in a state where the lifter is at a lower position and the stopper mechanism is released. It is the B section enlarged view of FIG. FIG. 5 is an enlarged cross-sectional view taken along the line CC in FIG. 4. It is a top view which shows the principal part of this invention, and is an enlarged view of the lifter and clamper of the lift apparatus of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base 3 Lift mechanism 2 Lifter a Mechanism part 5 Clamper 4 Stopper mechanism 8 Upper link 9 Lower link 18 Stopper lever 19 Fixing tooth 20 Rack 21 Stopper holder 25 Claw drive part 26 Clamp claw 29 Posture adjustment bolt

Claims (7)

A clamper is provided at the front of the lifter of the lift device main body that can be moved up and down and holds the mechanical parts such as the clutch cover and the flywheel assembled to the machine main body such as a vehicle in an assembled posture so as to be detachable from the substantially horizontal direction. Consisting of
The clamper has a plurality of clamp claws that extend forward and are displaced between a position for clamping the mechanical component and a position for releasing the mechanical component, and are fixed at the clamp position.
Lifting device for work. A clamper is provided at the front of the lifter of the lift device main body that can be moved up and down and holds mechanical parts such as a clutch cover and a flywheel that are assembled to the machine body from the horizontal direction while being removably held from the horizontal direction in the assembled posture. Consisting of
The clamper extends forward and is displaceable between a clamping position and a releasing position of the mechanical part, and is fixed in the clamping position, and extends in the same direction as the clamping claw to press the mechanical part surface. A posture adjusting member that adjusts the angle of the posture of the mechanical component clamped by the clamp claw,
Lifting device for work. The working lift device according to claim 1 or 2,
The lift device body includes a travelable base, a lifter on the base that is lifted and lowered by a lift mechanism, and a stopper mechanism that prevents the lifter from descending,
The stopper mechanism has a stopper lever that is pivotally supported on the side surface of the lifter and has a fixed tooth at the lower end, and a rack that is provided on the base and can mesh with the fixed tooth of the stopper lever.
The stopper lever and the rack are engaged with each other at positions where the rack and the fixed tooth are different according to the lift position of the lifter to prevent the lifter from being lowered.
Lifting device for work. The working lift device according to claim 3,
The stopper lever has a fixing means that is detachably fixed to the side surface of the lifter when the fixed tooth is rotated to a position where it does not mesh with the rack.
Lifting device for work. The posture adjustment member is an adjustment bolt that extends in parallel with the clamp pawl and includes a rotatable washer at the tip.
The work lift device according to any one of claims 1 to 4. The posture adjusting member presses the upper and lower surfaces of the mechanical part clamped by the clamping claws for an uneven length by an inclination angle necessary for assembling the mechanical part, thereby causing the mechanical part to be tilted forward or backward by a predetermined amount. Hold in a tilted position,
The work lift device according to any one of claims 1 to 4. The fixing means is for fitting the tip of the plunger protruded from the back surface of the stopper lever into a recess provided on the side surface of the lifter by the biasing force of the spring.
The working lift device according to claim 4.