JPH1053060A - Locking device of caster stopper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To guarantee certain stopper operation and eliminate complicated manipulation at loading. SOLUTION: At the rear edge of a platform 3, a caster stopper 1 is furnished in such a way as capable of protruding and retreating from the oversurface. A lock device 2 is equipped with a stopper lever 23, which revolves and advances onto the retreating locus of a pin element 12 of the caster stopper 1 to cause a engaging recess 232 to engage the pin element 12, and thereby the retreating motion of the caster stopper 1 is restricted. The stopper lever 23 is energized to advance by a coil spring 27 and its one end 231 contacts with the ground when the platform 3 sinks to near the ground to take refuge from upon the retreating locus of the pin element 12 against the energizing force of the coil spring 27.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lock device for a caster stopper, and more particularly to an improved lock device for a caster stopper for restricting the return movement of a caster such as a box pallet mounted on a platform of a vehicle lifter device. .

[0002]

2. Description of the Related Art As a caster stopper of a vehicle lifter device, for example, the one described in Japanese Utility Model Laid-Open Publication No. 58-50026 is known. This is a platform
A rear caster is provided with a plate-shaped caster stopper rotatable in a vertical plane, and the caster stopper is normally configured such that its front edge protrudes upward from the platform surface by the urging force of an attached torsion bar. . When the platform descends near the ground, the trailing edge of the caster stopper contacts the ground and rotates against the biasing force of the torsion bar, and descends and retreats until the front edge of the caster stopper is flush with the platform surface. . The caster stopper is provided with a lock device for preventing unexpected rotation and ensuring a reliable stopper operation. The lock device projects a spring-biased stopper rod to the side surface of the caster stopper. It is engaged to prevent its rotation.

[0003]

However, the lock device in the conventional caster stopper described above does not operate in conjunction with the raising and lowering of the platform. There is a problem in that an operation of disengaging or disengaging is required, which complicates the operation.

Therefore, the present invention solves such a problem and can ensure a reliable stopper action,
An object of the present invention is to provide a lock device for a caster stopper that does not require a complicated operation at the time of loading or the like.

[0005]

According to a first aspect of the present invention, a caster is provided on a rear edge of a platform (3) of a vehicle lifter device so as to protrude or retreat from the upper surface of the platform (3). The locking device of the stopper (1) advances on the retreat trajectory of the caster stopper (1) that is urged and protruded, and engages with a part (12) of the caster stopper (1) to retreat. And an urging means (27) for advancing the engaging body (23) so that the engaging body (23) moves when the platform (3) descends near the ground. Part (231)
Abuts against the ground and is retracted from the retreat locus of the caster stopper (1) against the urging force of the urging means (27).

In the first aspect of the present invention, when the platform descends near the ground, a part of the engaging body comes into contact with the ground and is retracted from the retreat locus of the caster stopper. This makes it possible to retract the caster stopper, load a box pallet or the like on the platform, or lower the box pallet from the platform. When the platform rises and moves away from the vicinity of the ground, the engaging body is advanced by the urging means onto the retreat trajectory of the caster stopper. As a result, even if the caster stopper is touched by mistake, the caster stopper is prevented from retreating, and a reliable stopper action is guaranteed. Since the retracting and advancing of the engaging body are performed in conjunction with the raising and lowering of the platform, even when loading and unloading a large number of box pallets, it is not necessary to operate the engaging body each time. Is eliminated.

In the second invention, the caster stopper (1)
Has one end pivotally supported by the trailing edge of the platform (3), and pivots between a projecting position and a retracted position.
Reference numeral 3) denotes a lever body whose center is pivotally supported and is rotationally biased to an advanced position by a biasing means (27). The engaging body (23) has one end (231) in contact with the ground and the other. At the end, an engaging projection (1) formed on the side surface of the caster stopper (1)
An engagement recess (232) that engages with 2) is formed.

According to the second aspect of the present invention, the caster stopper and the locking device thereof can be realized compactly.

[0009]

FIG. 1 shows an example of a vehicle lifter device having a caster stopper. In the figure, columns 5A and 5
B is provided. Runners 6A and 6B are provided in the columns 5A and 5B so as to be vertically movable.
B is raised or lowered by a drive mechanism (not shown). A cross beam 61 is provided between the lower ends of the left and right runners 6A and 6B. A front edge (left edge in the figure) of the rectangular platform 3 is placed on the cross beam 61, and the cross beam is formed by a mechanism not shown. 61. The leading edge of a wire 62 extending from the top of each of the left and right runners 6A and 6B is connected to the rear edge of the platform 3, and the platform 3 is held in a horizontal posture. The platform 3 has metal plates 35 and 36 mounted on the frame members 31, 32 and 34 except for the rear edges.
A caster stopper 1 having a constant width and extending in the left-right direction is provided.

An auxiliary plate 37 having a fixed width is rotatably attached to the frame member 33 at the rear end of the platform 3, and the auxiliary plate 37 is moved rearward with the platform 3 lowered near the ground as shown in the figure. To form an inclined surface with the ground. The platform 3 raises the runners 6A and 6B and positions the runners 6A and 6B at the same height as the storage section 42 opening at the lower edge of the vehicle rear opening 41, and then rotates the auxiliary plate 37 onto the platform 3 as described later. Then, it is pushed into the storage section 42 and stored. At this time, the slack portion of the wire 62 is drawn into the tops of the runners 6A and 6B by a drawing mechanism (not shown).

FIG. 2 is an enlarged view of a portion A in FIG. 1. A lock device 2 is provided at a side end of a caster stopper 1 provided on a platform 3. FIG. 3 is a side view of the caster stopper 1 and the lock device 2, and FIG. 4 is an enlarged plan view thereof. The caster stopper 1 has a flat and substantially triangular shape in a side view (FIG. 3), and its rear end (the right end in FIG. 3) is connected to a frame member 33 arranged on the rear edge of the platform 3 by a hinge 11. Are rotationally urged clockwise in the figure around the center of the hinge 11 by a spring member (not shown) attached thereto, and are in a standing state. On the side surface of the caster stopper 1, a pin body 12 as an engaging projection is provided substantially at the center.
Is protruding. That is, as shown in FIG. 4, the side plate 13 of the caster stopper 1 has a cylindrical collar body 14 at the center.
The pin body 12 is inserted into the collar body 14 from the inside of the caster stopper 1 (upper side in the figure), and its tip protrudes out of the collar body 14 so that the elongated hole 211 of the guide lever 21 ( 3). The pin body 12 is positioned by the rear end large-diameter portion 121 (FIG. 4) abutting against the inner end surface of the collar body 14 and is prevented from falling off by the washer plate 122 and the cushion ring 123 fitted to the intermediate small-diameter portion. Further, the tip end of the pin body 12 extends outward (downward in the drawing) of the caster stopper 1 and extends to a length that can be engaged with the engaging body 23.

A cylindrical collar body 22 is joined to one end surface of the guide lever 21, and the collar body 22 is rotatably fitted to a shaft 25. The shaft body 25 is erected on a bracket plate 24 (FIG. 5) provided on a frame member 31 (see FIG. 2) on the side edge of the platform 3. Pin body 12
Moves in the elongated hole 211 of the guide lever 21 and is locked at one end thereof, so that the caster stopper 1 is positioned by being rotated upward by a predetermined angle by a spring force as shown in FIG. Its front end protrudes upward by a predetermined amount from the surface of the metal plate 35 of the platform 3.

In FIG. 3, a stopper lever 23 as an engaging body is provided below the guide lever 21. The stopper lever 23 has a shaft body substantially at the center of the plate surface and standing upright on a bracket plate 24 (FIG. 5). 26 is rotatably fitted. A coil spring 27 (FIG. 4) as urging means is disposed between the bracket plate 24 and the stopper lever 23 around the shaft body 26. The spring force of the coil spring 27 causes the stopper lever 23 to move counterclockwise in FIG. 3. It is urged to rotate. In the state of FIG. 3 in which the platform 3 is near the ground, one end 231 of the stopper lever 23 is rotated clockwise against the above-mentioned spring force with the one end 231 in contact with the ground E, and its posture is nearly horizontal. It is in the evacuation position. An engagement recess 232 is formed at the other end of the stopper lever 23, and an operation pin 233 protrudes toward the side (FIG. 4).

When a box pallet with casters is mounted on the platform 3, the box pallet is connected to the platform 3 via an inclined auxiliary plate 37.
Push up. When the caster of the box pallet reaches the caster stopper 1, the caster stopper 1
The pin body 12 rotates around the hinge 11 in the counterclockwise direction of FIG. 3 (in the direction of the arrow in FIG. 3) while moving in the elongated hole 211 of the guide lever 21 without interfering with other members. The top surface is in a retracted state in which the top surface is flush with the metal plate 35. This allows the casters to pass over the caster stopper 1 without resistance. When the rear caster of the box pallet passes, the caster stopper 1 rotates clockwise again by the spring force and returns to the protruding state as shown in FIG.
The box pallet mounted on the platform 3 abuts on the rear caster W of the box pallet to prevent its return movement.

In this state, when the platform 3 rises and moves away from the vicinity of the ground, the stopper lever 23 rotates counterclockwise due to the spring force, and its posture becomes an almost upright advance posture (FIG. 6). In this state, the stopper lever 23
The engagement concave portion 232 is located on the locus of movement of the pin body 12 when the caster stopper 1 retreats and rotates counterclockwise. Therefore, for example, even if a worker riding on the platform 3 together with the box pallet accidentally steps on the caster stopper 1, the retreating rotation in the counterclockwise direction is performed by the engagement of the pin body 12 with the engagement recess 232. Be regulated. In this manner, when the platform 3 is separated from the ground, the caster stopper 1 is locked in a protruding state, so that a reliable stopper action on the rear wheel casters W of the box pallet is guaranteed.

After the box pallet is transferred from the raised platform 3 into the vehicle luggage compartment and the next box pallet is to be loaded, the platform 3 is again lowered close to the ground, as shown in FIG. Is rotated clockwise in the retracted position with one end 231 abutting against the ground E. As a result, the caster stopper 1 can be retracted, and a new box pallet can be loaded. When lowering the box pallet from the platform 3 that has descended near the ground, step on the caster stopper 1 and retreat it to a horizontal state.
Pass through casters.

When the platform 3 is stored in the storage portion 42 (FIG. 1) at the rear end of the vehicle, the operating pin 233 is gripped in the state shown in FIG. The recess 232 is retracted from the retreat path of the pin body 12 of the caster stopper 1. Thereafter, as shown in FIG. 7, when the auxiliary plate 37 is rotated on the platform 3, the load of the auxiliary plate 37 causes the caster stopper 1 to rotate to the horizontal retreat posture (arrow in the figure).
In this state, the platform 3 is pushed into the storage section 42 and stored.

As described above, according to the lock device of the present embodiment, when the platform 3 is descending near the ground, one end 231 of the stopper lever 23 comes into contact with the ground E and is turned to the retracted posture. As a result, the caster stopper 1 can be turned back and forth, and the loading and unloading of a box pallet or the like on the platform 3 can be performed freely. On the other hand, when the platform 3 is lifted and separated from the ground, the stopper lever 23 is advanced and rotated by the spring force, and the engaging recess 232 is advanced on the movement locus of the pin body 12 of the caster stopper 1. This prevents the caster stopper 1 from retreating. Therefore, even if the caster stopper 1 is depressed by mistake, the caster stopper 1 does not retreat and rotate, and a reliable stopper action on the caster W is guaranteed. Since the retracting and the advance of the stopper lever 23 are automatically performed in accordance with the vertical movement of the platform 3, a complicated operation such as a conventional stopper device is not required.

In the above embodiment, the case where the rotating stopper lever 23 is attached to the rotating caster stopper 1 has been described. However, the caster stopper 1 and the stopper lever 23 need not be rotated. ,
For example, the vehicle may go straight. Further, when the advance amount of the caster stopper 1 is limited to a certain amount by the deformation of the attached spring member, the guide lever 21 does not need to be provided.

[0020]

As described above, according to the caster stopper locking device of the present invention, a reliable stopper action is ensured, and complicated operations such as during loading are not required.

[Brief description of the drawings]

FIG. 1 is a rear perspective view of a box-type luggage vehicle provided with a lifter device.

FIG. 2 is an enlarged perspective view of a portion A in FIG.

FIG. 3 is a partial cross-sectional side view of a lock device provided on a platform, and is a cross-sectional view taken along line III-III of FIG. 4;

FIG. 4 is an enlarged plan view of the lock device.

FIG. 5 is a perspective view of a bracket plate.

FIG. 6 is a partial cross-sectional side view showing the operation of the lock device.

FIG. 7 is a partial cross-sectional side view showing the operation of the lock device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Caster stopper, 12 ... Pin body, 2 ... Locking device, 23 ... Stopper lever, 231 ... One end, 232 ... Engaging recess, 27 ... Coil spring, 3 ... Platform.

Claims (2)

[Claims] 1. A locking device for a caster stopper (1) provided on a trailing edge of a platform (3) of a vehicle lifter device so as to protrude or retreat from a top surface of the platform (3), wherein the projection is biased. The caster stopper (1) advances on the retreat trajectory, and a part (1
(2) an engaging body (23) for restricting the retreating movement by engaging the engaging body (23); and an urging means (27) for advancing and urging the engaging body (23). Is a part (23) of the engaging body (23) when the platform (3) descends near the ground.
The caster stopper lock is characterized in that the caster stopper is retracted from the retreat locus of the caster stopper against the biasing force of the biasing means. apparatus. 2. The caster stopper (1) has one end pivotally supported by the trailing edge of the platform (3) and pivots between a protruding position and a retracted position. One end (231) of the engaging body (23) is in contact with the ground, and the other end of the caster stopper (23) is supported by the lever body which is supported and is rotationally biased to the advanced position by the biasing means (27). The engagement protrusion (1) formed on the side surface of (1).
The lock device for a caster stopper according to claim 1, wherein an engagement recess (232) that engages with (2) is formed.