JP4083535B2 - Loading platform lifting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a load receiving platform lifting device that is mounted on the rear or side of a truck and is used for loading and unloading loads.
[0002]
[Prior art]
A load receiving table lifting device mounted on a lorry performs loading and unloading of cargo in a packing box by a load receiving table that can be lifted and lowered by an arm to which power such as hydraulic pressure is applied. Such a cargo receiving platform lifting / lowering device is stored in the lower part of the vehicle body when not in use, and is deployed when in use.
The present applicant, as an arm structure for storing the arm in a compact manner while ensuring the length of the arm, includes a base link mechanism including a pair of base arms rotatable around a fulcrum provided on the vehicle body, and a base arm Proposed that includes a pair of tip arms pivotally attached to the pivot end side of each of them, and is foldable with respect to the base link mechanism, and has a tip link mechanism that supports the load receiving platform on the tip side. (See Patent Document 1).
According to this arm structure, the base arm and the distal end arm ensure the length of the predetermined arm as a whole in the unfolded state, and when retracted, the distal end link mechanism is folded with respect to the base link mechanism. The whole device becomes compact.
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 2002-274246
[Problems to be solved by the invention]
Further, the applicant of the present application in Japanese Patent Application No. 2001-310445 is provided to urge the tip arm in the standing direction in order to reduce the operation burden when the tip arm in the deployed state is raised in the folding direction. A biasing means (torsion spring) is disclosed.
The urging force of the urging means is set to be smaller than the force acting on the load receiving table to rotate the tip arm in the deployment direction, so that the tip arm deploys regardless of the urging force. It is designed to be held in position.
[0005]
However, when the urging force exceeds the force due to the weight of the load receiving stand or the like, the tip arm stands up with respect to the base arm.
In particular, when the load receiving platform is raised and lowered without a load being loaded, the urging force may overcome the weight of the load receiving platform in the middle of the lift, and the tip arm may stand up with respect to the base arm.
On the other hand, if the urging force is set very small so that the urging force does not overcome the weight of the load receiving platform, the degree of reduction of the operation burden when the tip arm is folded is reduced and the significance of providing the urging means is reduced. To do.
[0006]
Therefore, an object of the present invention is to provide a load receiving table lifting / lowering device that can reliably maintain the deployed state of the distal end arm even if a biasing means for rotating the distal end arm in the folding direction is provided.
[0007]
[Means for Solving the Problems]
The present invention is a load receiving platform lifting device in which a load receiving platform moves up and down via an arm provided on a vehicle body side, wherein the arm includes a base arm that is rotatable with respect to the vehicle body around a fulcrum, and the base A distal end arm that is pivotally provided on the pivot end side of the arm, is pivotable between an unfolded state and a folded state, and supports a load receiving base on the distal end side; A biasing portion that biases the distal end arm to rotate from the unfolded state to the folded state, and a rotation that can regulate the rotation of the distal end arm in the unfolded state toward the folded state. And a movement restricting portion, wherein the load receiving table is moved up and down in a state where the distal end arm in the unfolded state is restricted from rotating toward the folded state.
[0008]
According to the present invention, since the urging portion for urging the distal end arm toward the folded state is provided, the urging force of the urging portion becomes an assist force when folding the distal end arm, and the folding is facilitated.
In addition, the rotation restricting portion restricts the distal end arm in the unfolded state from rotating toward the folded state, so that the tip end arm rotates unnecessarily during lifting and lowering of the load receiving table even if the urging portion is provided. It is prevented from moving.
[0009]
Further, the rotation restricting portion includes an engagement member and an engaged member that can be engaged with the engagement member so as to prevent rotation of the distal end arm from the expanded state to the folded state. The engaged member includes an engagement position that engages with the engagement member, and a non-engagement position that allows rotation of the distal end arm without causing engagement with the engagement member. It is preferable that the gap is displaceable.
In this case, the rotation of the tip arm is restricted by setting the engaged member to the engaged position, and the restriction can be released by setting the engaged member to the non-engaged position.
[0010]
Furthermore, it is preferable that the engaged member is urged so that each position is held with a middle point between the engaging position and the non-engaging position as a dead point. In this case, the engagement position and the non-engagement position can be reliably held at the respective positions.
[0011]
Further, when the distal end arm is rotated toward the folded state in a state where the engaged member is in the non-engaged position, the engaged member exceeds the dead point by the turning force. It is preferable to return to the engaged position. In this case, by folding the distal end arm, the engaged member automatically returns to the engagement position and is regulated, and there is no need to perform another regulation operation.
[0012]
The rotation restricting portion is provided corresponding to each of the left and right arms provided on the vehicle body, and includes an interlocking operation portion that can commonly perform the position displacement operation of each engaged member of both the rotation restricting portions. It is preferable. In this case, the operation of the left and right rotation restricting portions can be performed in common by the interlocking operation portion.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a load receiving table lifting apparatus according to an embodiment of the present invention will be described with reference to the drawings. FIGS. 1 and 2 are a rear view and a side view, respectively, showing the load receiving platform lifting / lowering device 1 attached to the lower part of the cargo box 102 at the rear part of the body 101 of the truck. In FIG. 2, brackets 2A are attached to both side surfaces of the chassis 104 behind the rear wheel 103, and a support member 2B is attached thereto. The load receiving table lifting / lowering device 1 is attached to the vehicle body 101 via the support member 2B. 2 is in a traveling state stored in the lower part of the vehicle body 101. As shown in FIG. In use, the vehicle is pulled out from the state of FIG. 2 to the rear of the vehicle body 101 as shown in the order of FIG. 3, FIG. 4, FIG. 5, and FIG.
[0014]
Next, the structure of the arm of the load receiving platform lifting / lowering apparatus 1 will be described with reference to FIG. 7 which is an enlarged view of the arm of FIG. 6 in the unfolded state and FIG. 8 which is an arm plan view. 7 and 8 show only the port side (left side as viewed from the rear of the vehicle body), the starboard side also includes an arm having a symmetrical structure.
[0015]
The load receiving platform lifting / lowering device 1 basically includes a two-stage arm including a base arm (base lower arm 4 and base upper arm 8) and a tip arm (tip lower arm 13 and tip upper arm 16). Have.
The base lower arm 4 is configured by two long plate members 4a and 4b facing each other in parallel in the left-right direction at a predetermined interval, and a pin 5 provided at a left end portion which is a rotation base end portion. The pin 5 is supported through a pin support member 2C provided on the support member 2B. The pin support member 2C is integral with the vehicle body 101 via the support member 2B, and the base lower arm 4 rotates with respect to the vehicle body 101 with the pin 5 as a fulcrum. Further, the right end portion which is the rotation end portion of the base lower arm 4 is connected to the base connecting member 7 via a pin 6 as an action point.
[0016]
The base upper arm 8 is configured by two long plate members 8a and 8b facing each other in parallel in the left-right direction at a predetermined interval, and a pin 9 provided at a left end portion which is a rotation base end portion. The pin 9 is supported by the support member 2B. The support member 2 </ b> B is integral with the vehicle body 101, and the base upper arm 8 also rotates with respect to the vehicle body 101. Further, the right end portion, which is the rotation end portion of the base upper arm 8, is connected to the base connecting member 7 via a pin 10 as an action point. Here, if the pins 9 and 5 are a pair of upper and lower fulcrums A and B, and the pins 10 and 6 are operating points C and D corresponding to the fulcrums A and B, respectively, the base lower arm 4, the base connecting member 7, The base arm comprising the base upper arm 8 constitutes a base link mechanism having A, B, C and D as four vertices.
[0017]
The base lower arm 4 is provided with a hydraulic cylinder (not shown) as a drive device. The hydraulic cylinder is connected between the support member 2B and the base lower arm 4 and is driven to rotate up and down with respect to the support member 2B about the fulcrum B by expansion and contraction. When the base lower arm 4 is rotated by the supply of hydraulic pressure, the base upper arm 8 is also rotated accordingly. The hydraulic cylinder may be provided on the base upper arm 8 side.
[0018]
In FIG. 7, the tip lower arm 13 is in the most unfolded state (the state shown in FIG. 6) with respect to the base arms 4 and 8, and is pivotally attached to the base lower arm 4 by the pin 6 and counterclockwise from the position shown in FIG. It is attached so as to be rotatable within a predetermined range in the direction. The lower arm 13 of the distal end portion is constituted by two long plate members 13a and 13b facing each other in parallel in the left-right direction at a predetermined interval. The right end portion, which is the distal end portion of the distal end lower arm 13, is connected to the distal end connecting member 15 via a pin 14 as an action point. The distal end upper arm 16 is pivotally attached to the base upper arm 8 by a pin 10 and can be rotated counterclockwise within a predetermined range. The right end portion, which is the distal end portion of the distal end upper arm 16, is connected to the distal end connection member 15 via a pin 17 as an action point. Here, assuming that the pins 17 and 14 are acting points E and F, respectively, the distal end arm composed of the distal end lower arm 13, the distal end connecting member 15, and the distal end upper arm 16 is represented by C, D, E, and F. A tip link mechanism composed of a parallelogram with four vertices is formed.
[0019]
The load receiving base 18 supported by the base link mechanism (ABCD), the tip end link mechanism (CDEF) and the tip end link mechanism has a solid line in FIG. The upper position of 18 is the uppermost lift. In addition, the lower position of the load receiving platform 18 indicated by a two-dot chain line is an intermediate position.
Further, the distal end link mechanism (CDEF) is rotated in the counterclockwise direction with respect to the base link mechanism (ABCD), and is shown in the order of FIGS. 5, 4, and 3 from the developed state of FIG. It can be folded as shown. Then, when the base arms 4 and 8 are driven up from the state shown in FIG.
[0020]
In addition, the load receiving stand 18 is also a foldable structure, and includes a main plate 19 and a sub plate 20. The sub plate 20 can be rotated in the counterclockwise direction from the position shown in FIG. 6 with respect to the main plate 19 (see FIG. 5). The main plate 19 is attached so as to be able to turn counterclockwise from the illustrated position with the pin 17 as a support point. Further, the stopper 21 attached to the main plate 19 is in contact with the right end surface of the tip end connecting member 15. The guide plate 22 formed integrally with the left end of the main plate 19 serves to fill a gap between the floor surface of the load box 102 and the load receiving platform 18 when loading and unloading the load.
[0021]
The raising / lowering mechanism of the load receiving stand 18 will be briefly described. When the base lower arm 4 and the base upper arm 8 rotate within the range shown in FIG. 6 by the operation of the hydraulic cylinder, they are connected to the rotating end side and rotate clockwise with respect to the base upper arm 8. The distal end upper arm 16, which is stopped, rotates integrally, and the distal end lower arm 13 also rotates following this. Since the load receiving platform 18 is prevented from rotating in the clockwise direction by the stopper 21, the load receiving platform 18 moves up and down while maintaining its horizontal posture with the rotation of the upper arm 16.
[0022]
Returning to FIG. 8, the urging portion 44 of the tip arm 13, 16 omitted in the above description, and the rotation restricting portion 50 for restricting the rotation of the tip arm 13, 16 by the urging portion. Will be explained.
In FIG. 8, a spring 44 is disposed as an urging portion on the inner side surface of the tip end lower arm 13. The spring 44 includes a first spring support pin 45 that protrudes inward from the vicinity of the base side of the tip end lower arm 13, and a second spring support that is supported by the tip end connecting member 15 and disposed inside the tip end lower arm 13. A spring 44 is provided so as to connect the two pins.
[0023]
The spring force of the spring 44 is applied between the distal end lower arm 13 and the distal end connecting member 15 and is applied in the direction of widening the angle DFE from the state of FIG. 6 or FIG. 13 is in a stored state in a deployed state. The urging force of the spring 44 in the deployed state of the distal end lower arm 13 is set to be smaller than the force that the gravity acting on the load receiving base 18 rotates the distal end arm in the deployed direction.
When a force is applied in the direction of expanding the angle DFE, a force for rotating the distal end upper arm 16 and the distal end lower arm 13 of FIG. 6 or 7 in the counterclockwise direction is applied to the distal end link mechanism. The That is, deformation biasing is performed on the parallelogram CDEF so as to push E and F upward. At this time, the urging force of the stored spring 44 acts as a force for rotating the distal end arms 13 and 16 in the folding direction with respect to the base arms 4 and 8. Further, when the tip end lower arm 13 rotates in the folding direction, the spring 44 is released along with it, and it becomes free during the rotation (position in FIG. 4).
[0024]
As shown in FIG. 6, the loading platform 18 is raised and lowered with the distal end arms 13 and 16 being deployed. Rotation of the tip end arms 13 and 16 is prevented so that the tip end arms 13 and 16 turn unnecessarily toward the folded state by the urging force of the spring 44 that is the urging portion during the ascending and descending. A rotation restricting portion 50 for restricting is provided (see FIG. 8).
The rotation restricting portion 50 is configured by a combination of an engaging member 51 provided on the base side of the distal end lower arm 13 and an engaged member 52 provided on the distal end side of the base lower arm 4. When the members 51 and 52 are engaged, the rotation is restricted.
[0025]
The engaging member 51 is provided so as to rotate integrally with the tip end lower arm 13 around the pin 6 between the plate members 13 a and 13 b constituting the tip end lower arm 13.
The engaged member 52 is disposed between the plate members 4 a and 4 b constituting the base lower arms 4 and 4. As shown in FIG. 9, the left and right base lower arms 4, 4 are integrally connected to the left and right by a lower arm connecting member 54, and an engaged member 52 is a bracket provided on the lower arm connecting member 54. 55 is provided so as to be rotatable by a pin 56.
[0026]
The left and right engaged members 52 are connected by an operating rod 57, and a lever portion 58 is provided at an intermediate portion in the longitudinal direction of the operating rod 57 as an interlocking operating portion for rotating the operating rod 57. ing. The operating rod 57 and the pin 56 are coaxially arranged, and the engaged member 52 rotates around the pin 56 by manually operating the lever portion 58 and rotating the operating rod 57.
Further, the engaged member 52 has an engaging contact portion 52a for contacting and engaging with the engaging member 51, and a rotating member for rotating the engaged member 52 by contacting the engaging member 51. A contact portion 52b.
[0027]
Between the engaged member 52 and the bracket 55, a spring 59 for biasing the rotation of the engaged member 52 is provided. The spring 59 is disposed between the position of the engagement contact portion 52 a and the bracket 55.
In the spring (engaged member urging portion) 59, the engaged member 52 is moved in the direction shown in FIG. 10A (extension position; engagement position) and in the direction shown in FIG. It is urged to take one of the following positions. The engaged member 52 has a rotation range restricted between an extended position and a retracted position by a stopper (not shown). The spring 59 has a dead point (the position of the engaged member 52 indicated by the two-dot chain line in FIG. 10C) that is in the maximum extension state at an intermediate position between the extended position and the retracted position and is stored. However, if the engaged member 52 is slightly rotated from the dead point D to the extended position side, it is forcibly rotated to the extended position by the spring force, and conversely, the engaged member 52 is retracted from the dead point D. If it is slightly rotated to the position side, it is forcibly rotated to the retracted position by the spring force.
[0028]
FIG. 10A shows the tip end lower arm 13 in a folded state with respect to the base lower arm 4. In this state, the engaging member 51 is below the engaged member 52. The engagement member 51 is formed to have an engagement contact surface 51a and a relief contact surface 51b. The engagement contact surface 51a is formed so as to be engageable with the engaged member 52 when the distal end lower arm 13 is rotated in the folding direction, and the release contact surface 51b is configured to be the distal end lower arm. It is formed so as to allow rotation while allowing the engaged member 52 to escape so as not to restrict rotation when 13 is rotated in the deployment direction.
[0029]
When the tip lower arm 13 is rotated clockwise toward the unfolded state as shown in FIG. 10 (b) in order to use the load receiving platform 18, the engaging member 51 is also rotated clockwise and released. The contact surface 51 b contacts the engagement contact portion 52 a of the engaged member 52. The relief contact surface 51b pushes up the engaged member 52 against the urging force of the spring 59 and rotates it counterclockwise, so that the engaging member 51 is in the extended position (engaged position). It can rotate beyond the member 52 (see FIG. 10C).
[0030]
As shown in FIG. 10 (c), the engaged member 52 is set so that the position where it is most released by the escape contact surface 51 b is closer to the overhanging position than the dead point D. Therefore, as shown in FIG. 10D, when the rotation of the engaging member 51 exceeds the engaged member 52, the engaged member 52 pushed back to the retracted position side is naturally moved by the urging force of the spring 59. Return to the overhang position.
In the state shown in FIG. 10D, the spring 44 is urged so as to rotate the tip end lower arm 13 in the folding direction (counterclockwise). The mating contact surface 51a is regulated by being in contact with and engaging with the engagement contact portion 52a of the engaged member 52 in the extended position. Thus, the engaged member 52 in the extended position is configured as a one-way lock device that permits rotation of the distal end arm in the deployment direction but does not allow rotation in the folding direction.
[0031]
The lifting / lowering of the load receiving table 18 as shown in FIG. 6 can be performed in a state where the rotation restriction is performed, and the tip end lower arm 13 rotates and stands in the folding direction while the load receiving table 18 is lifted / lowered. Is surely prevented.
In the present embodiment, since the rotation restricting portion 50 is configured as a one-way locking device, the engaged member 52 is in the extended position (engagement position) when the distal end arm in the folded state is in the unfolded state. The unfolding operation may be performed in a state where the rotation is restricted, and the rotation restriction in the unfolded and unfolded state can be performed without performing the operation on the rotation restriction unit 50.
On the other hand, in order to release the rotation restriction, the lever member 58 is operated to rotate the engaged member 52 counterclockwise as shown by a two-dot chain line in FIG. The member 52 is changed and held at the retracted position (non-engagement position) (see also FIG. 11A). When the engaged member 52 is in the retracted position, the engaging member 51 can rotate in the folding direction (counterclockwise) without contacting the engaging contact portion 52a. Further, since the operating rod 57 that is rotated by the operation of the lever portion 58 rotates both the engaged members 52 of the left and right rotation restricting portions 50, the restriction of both the rotation restricting portions 50 is controlled by a single operation. Can be released.
[0032]
In order to fold the front end arms 13 and 16 in order to store the load receiving stand 18, the rotation restricting portion 50 is set in a deregulated state, and the front end arms 13 and 16 are rotated counterclockwise. At this time, the urging force of the spring 44, which is the urging portion, becomes an assist force when folding the tip end arms 13 and 16, and the folding is facilitated. In addition, in the present embodiment, the urging force of the urging portion 44 can be made larger than that described above, and the assist force for the folding operation of the distal end arms 13 and 15 can be increased. That is, even if the urging force of the urging unit 44 is increased, the assist force by the urging unit 44 acts only when the restriction is released, and the tip end arms 13 and 16 do not rotate even when there is an assist force when the rotation is restricted. . Therefore, unnecessary rotation of the tip arms 13 and 16 can be reliably prevented while increasing the urging force and increasing the assist force.
[0033]
When the distal end arm is folded, when the engaging member 51 is rotated to the position of FIG. 11 (b) as the distal end lower arm 13 is rotated, the contact surface 51a of the engaging member 51 becomes the engaged member. 52 abuts on the pivot contact 52b. By this contact, the engaging member 51 rotates the engaged member 52 in the retracted position clockwise (downward), and further rotates until the dead point D is exceeded (see FIG. 11C). The engaged member 52 is changed to the overhang position (see FIG. 11D). Further, the tip end lower arm 13 is further rotated to finally be in a folded state as shown in FIG.
[0034]
Thus, in the folded state of the distal end arm, it is guaranteed that the engaged member 52 is in the extended position, and if the distal end arm is expanded again from this state, the rotation is restricted at the deployed position. It can be carried out. That is, in this embodiment, only the rotation restriction release operation is necessary, and the rotation of the distal end arm itself also serves as the rotation restriction operation, and it is not necessary to separately perform the rotation restriction operation. Simple.
[0035]
The present invention is not limited to the above embodiment. For example, in the above-described embodiment, the engaging member 51 is provided so that a member different from the distal end lower arm 13 rotates integrally with the distal end lower arm 13, but a part of the distal end lower arm 13 is used as the engaging member 51. You may make it engage with the to-be-engaged member 52. FIG.
In the above embodiment, the engaging member 51 is disposed on the distal end lower arm 13 side, and the engaged member 52 that can be displaced to the engaging position and the non-engaging position is disposed on the base lower arm 4. It may be. In the above embodiment, the rotation restricting portion 50 is disposed on the lower arms 4 and 13, but may be disposed on the upper arms 8 and 16.
[0036]
【The invention's effect】
According to the present invention, the rotation restricting portion restricts the distal end arm in the unfolded state from rotating toward the folded state. Therefore, the biasing portion biases the distal end arm toward the folded state. Even if it is provided, it is possible to prevent the tip arm from rotating unnecessarily during raising and lowering of the load receiving table.
Further, when the rotation restricting portion is composed of an engaging member and an engaged member, and the engaged member is displaceable between the engaging position and the non-engaging position, the engaged member The restriction can be easily released by setting the position to the non-engagement position.
[0037]
Further, when the engaged member is biased so that each position is held with an intermediate point between the engaged position and the disengaged position as a dead point, the engaged position is disengaged from the engaged position. The combined position can be reliably held at each position.
In addition, when the tip end arm is rotated toward the folded state with the engaged member in the non-engaged position, the engaged member exceeds the dead point by the rotational force and the When configured to return to the combined position, the engaged member is automatically returned to the engaged position by folding the distal end arm, and regulation is not required, and there is no need to perform another regulation operation. .
[0038]
The rotation restricting portion is provided corresponding to each of the left and right arms provided on the vehicle body, and includes an interlocking operation portion that can commonly perform the position displacement operation of each engaged member of both the rotation restricting portions. In this case, the left and right rotation restricting portions can be operated in common by the interlocking operation portion.
[Brief description of the drawings]
FIG. 1 is a rear view of a state in which a load receiving platform lifting apparatus according to an embodiment of the present invention is attached to a lower part of a cargo box at a rear part of a body of a truck.
FIG. 2 is a side view of the load receiving table lifting device, showing a state of being stored in a vehicle body.
FIG. 3 is a side view of the load receiving platform lifting device, in a state in which the base arm is lowered with the front end arm folded into the base arm (or a folded state in which the front end arm is further rotated from the state of FIG. 4; ).
4 is a side view of the load receiving platform lifting device, in which the tip arm rotates from the state of FIG. 3 toward the deployed state (or the tip arm rotates from the state of FIG. 5 toward the folded state). And the tip arm is upright.
5 is a side view of the load receiving table lifting device, in which the tip arm is further rotated from the state shown in FIG. 4 toward the unfolded state (or the load receiving stand is folded from the state shown in FIG. 6; FIG. Shows a state of rotating toward the folded state).
FIG. 6 is a side view of the load receiving table lifting device, showing a state where the tip arm and the load receiving platform are deployed and the load receiving table is moved up and down.
7 is a side view showing an arm corresponding to FIG. 6; FIG.
FIG. 8 is a plan view of an arm.
FIG. 9 is a rear view of the apparatus mainly showing an engaged member and an operating rod of a rotation restricting portion.
FIG. 10 is a side view showing an arm expanding operation.
FIG. 11 is a side view showing an arm folding operation.
[Explanation of symbols]
1 Loading platform lifting device 4 Base lower arm (base arm)
5 pin (fulcrum)
8 Base upper arm (base arm)
9 pin (fulcrum)
13 Tip Lower Arm (Tip Arm)
16 Tip arm (tip arm)
18 Cargo stand 44 Spring (Biasing part)
50 Rotation restriction part 51 Engaging member 52 Engaged member 58 Lever part (interlocking operation part)
101 body

Claims (5)

A load receiving table lifting device in which the load receiving table moves up and down via an arm provided on the vehicle body side,
The arm is provided with a base arm that is rotatable with respect to the vehicle body around a fulcrum, and is pivotally provided on a rotating end side of the base arm so that the arm can be rotated between an expanded state and a folded state. A tip arm that supports the cradle on the tip side, and
The arm further includes a biasing portion that urges the tip end arm to rotate from the unfolded state toward the folded state, and the unfolded tip end arm to rotate toward the folded state. A controllable rotation restricting section;
A cargo receiving platform elevating device characterized by comprising: The rotation restricting portion includes an engagement member and an engaged member that can be engaged with the engagement member so as to prevent the rotation of the distal end arm from the expanded state to the folded state.
The engaged member is between an engagement position that engages with the engagement member and a non-engagement position that allows rotation of the distal end arm without causing engagement with the engagement member. The load receiving platform elevating device according to claim 1, wherein the device is displaceable. The load receiving base according to claim 2, wherein the engaged member is biased so that each position is held with a middle point between the engaging position and the non-engaging position as a dead point. lift device. When the distal end arm is rotated toward the folded state with the engaged member in the non-engaged position, the engaged member exceeds the dead point by the turning force and is engaged. 4. The load receiving platform lifting device according to claim 3, wherein the device is returned to a position. The rotation restricting portion is provided corresponding to each of the left and right arms provided on the vehicle body,
The load receiving table lifting device according to any one of claims 2 to 4, further comprising an interlocking operation unit that can commonly perform a position displacement operation of each engaged member of both rotation restricting units.

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