JPH1030352A - Pallet falling preventive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce noises at the time of operation by installing a spring member obstructing rotation by elastic force. SOLUTION: A lever 28 rotatably mounted on a shaft 27 is connected to a moving core 31 for an electromagnetic solenoid 32 through a rod 30. The lever 28 is held at the place of retraction because the moving core 31 is attracted when the electromagnetic solenoid 32 is excited, and the lever 28 is moved to a set place by its own weight when excitation is stopped. A coil spring 36, one end of which is fixed on a fixture 34 fastened to a side wall and the other end is fixed on the mounting lever 35 of the moving core 31, energizes the lever 28 in the direction opposite to the movement of the lever to the set place when it is shifted from the place of retraction to the set place by its own weight while stopping the lever 28 at a place, where the lever 28 is not brought into contact with a holding wall 38. Accordingly, when the lever 28 stops its movement, it does not collide with the holding wall 38, and no collision sound (noises) is generated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pallet fall prevention device which is attached to a multi-story parking machine for raising and lowering a pallet on which a car is mounted, and which prevents the pallet from falling.

[0002]

2. Description of the Related Art Conventionally, in order to secure a parking space for a car, a multi-story parking machine has been put to practical use in which a pallet on which the car is mounted is moved up and down by a chain driven by a motor. Here, in such a multi-story parking machine, when holding the pallet in the raised position,
A pallet is held by a chain, but a pallet fall prevention device is mounted to prevent the pallet from falling even if the chain is broken.

This type of pallet fall prevention device has a lever which can be taken in and out of a pallet elevating path. The pallet is supported by projecting the lever into the pallet elevating path. The pallet is configured so as not to hinder the lifting and lowering of the pallet.

[0004] As one of the mechanisms for projecting / retracting the lever, for example, the lever is rotatably mounted and abuts on the lower portion of the lever to project the lever into the pallet lifting path. A holding member for holding the movable iron core connected to the lever via the rod by energization, and an electromagnetic solenoid for rotating the lever from the set position to a retracted position which does not intersect with the pallet lifting path. Is known.

[0005] In the pallet fall prevention device having such a mechanism, the lever is held at the retracted position by energizing the electromagnetic solenoid, and is held at the set position by stopping energization.

[0006]

However, in such an apparatus, when the lever is moved from the retracted position to the set position, the lever is rotated by a spring which biases the lever toward its own weight or the set position, thereby holding the lever. Since the vehicle is stopped by colliding with the vehicle, there is a problem that loud noise is generated at the time of the collision.

Also, when the lever is moved from the set position to the retracted position, there is a problem that noise is generated from the electromagnetic solenoid with the operation of the movable iron core. That is, in this type of electromagnetic solenoid, in order to increase the attraction force acting on the movable iron core, a magnetic material also serving as a stopper for regulating the movement is provided at a position facing the end of the attracted movable iron core. The movable iron core that has been arranged and is attracted collides with the magnetic material to generate noise.

The present invention has been made in order to solve the above problems.
An object of the present invention is to provide a pallet fall prevention device capable of reducing noise during operation.

[0009]

Means for Solving the Problems and Effects of the Invention According to the first aspect of the present invention, there is provided a pallet which is rotatably mounted on a predetermined support shaft and on which an automobile is mounted. A pallet receiving portion formed to be protrudable in the elevating path, a holding member abutting on the pallet receiving portion and holding the pallet receiving portion in a set position protruding into the elevating path of the pallet, and an external command And an actuator for rotating the pallet receiving portion in a direction to separate the pallet from the holding member and holding the pallet receiving portion at a retracted position that does not intersect with the elevating path of the pallet. A spring member that urges the pallet receiving portion in a direction that prevents rotation by elastic force when the pallet receiving portion is rotated from the retracted position to the set position by its own weight. And wherein the digit.

In the pallet fall prevention device according to the present invention, the actuator rotates the pallet receiving portion in a direction to separate the pallet receiving portion from the supporting member in accordance with an external command. The pallet is moved from the settable position to a retracted position where the pallet can be raised and lowered, and is held at this retracted position.

On the other hand, when the driving of the actuator is stopped and the movable portion of the actuator can freely operate,
The pallet receiver rotates from the retracted position to the set position by its own weight. At this time, since the spring member urges the pallet receiving portion in a direction for preventing rotation by the elastic force, the pallet receiving portion abuts on the holding member in a state where the pallet receiving portion is sufficiently decelerated.

Therefore, according to the pallet fall prevention device of the present invention, it is possible to reduce the collision noise generated when the pallet receiving portion and the holding member come into contact with each other. Next, claim 2
In the pallet fall prevention device according to the first aspect, the elastic force of the spring member is balanced with gravity applied to the pallet receiving portion in the vicinity of the holding member, and the holding member is mounted on the pallet. It is set so as to be held at a position away from the receiving portion.

Therefore, according to the pallet fall prevention device of the present invention, when the pallet receiving portion is moved from the retracted position to the set position, the pallet receiving portion stops without abutting on the holding member, and is stopped at that position. Since it is held, noise at the time of collision can be prevented. The holding member supports the pallet receiving portion only when the pallet is actually dropped and a large force greater than its own weight is applied to the pallet receiving portion.

Next, a third aspect of the present invention is directed to the first aspect.
Alternatively, in the pallet fall prevention device according to claim 2, the spring member generates an elastic force only when the pallet receiving portion is within a predetermined section near the holding member. That is, the spring member is only required to deform and generate an elastic force in a short section within a predetermined section near the holding member.

Therefore, according to the pallet fall prevention device of the present invention, since the amount of deformation of the spring member can be reduced, the accuracy and durability of the spring member, and the reliability of the device can be improved. It should be noted that, as the spring member, claim 4
As described in (5), an expansion / contraction spring that supports the movable portion of the pallet receiving portion or the actuator that operates together with the pallet receiving portion may be used. A torsion spring wound around the support shaft so as to bias it may be used.

Next, the invention according to claim 6 is the invention according to claim 1.
6. The pallet fall prevention device according to claim 5, wherein the actuator is slidably inserted into a magnetic coil wound in a ring shape, a hollow portion of the magnetic coil, and connected to one end. A movable iron core that drives the pallet receiving portion via a link member, wherein the movement of the movable iron core is not restricted.

That is, in the pallet fall prevention device of the present invention, when the electromagnetic coil is excited to suck the movable iron core, there is no member that collides with the movable iron core and restricts the movement of the movable iron core. No noise such as collision noise is generated when the movable iron core moves. Therefore, according to the pallet fall prevention device of the present invention, generation of noise can be prevented even when the pallet receiving portion is moved from the set position to the holding position.

In the electromagnetic solenoid according to the present invention, the magnetic material is not arranged at a position facing the end of the attracted movable iron core. Although the suction force acting on the movable iron core is weak, in the pallet fall prevention device of the present invention, the spring member applies a biasing force in the direction of rotating the pallet receiving portion from the set position to the retracted position. The pallet receiving portion can be rotated by the suction force. As a result, the device can be configured without increasing the size of the electromagnetic solenoid without disposing the magnetic material.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. 3A is a side view illustrating a schematic configuration of a multi-story parking machine to which the pallet fall prevention device of the first embodiment is applied, and FIG. 3B is a cross-sectional view taken along line AA.

As shown in FIG. 3, the multi-story parking machine 2 is constructed so that cars can be parked in upper and lower tiers, and a pallet 4 for placing an automobile to be parked in the upper tier and a pallet 4 are provided. It comprises an elevating mechanism 6 that moves up and down and holds it at an upper position or a lower position, a motor 8 that drives the elevating mechanism 6, and a control device 10 that controls operations of the elevating mechanism 6 and the motor 8.

The lifting mechanism 6 includes two pallets 4 on both sides of the pallet 4 in the longitudinal direction.
The pallet 4 includes two columns P provided on each side along the longitudinal direction of the pallet 4 and fixed to the two columns P, respectively. Further, a sprocket 12 is provided on an upper portion of each support P, and a chain 14 for raising and lowering the pallet 4 is hung on each sprocket 12. Each sprocket 12 is attached to a common drive shaft 16, 17 for each of the sprockets located at both ends in the longitudinal direction of the pallet 4.
Is directly driven to rotate by a motor 8 and the other drive shaft 1
7 is rotatably driven via a driving force transmitting sprocket 13 and a chain 15 attached to the driving shafts 16 and 17.

Further, two pallet fall prevention devices 20 of this embodiment are fixed to the lower part of each girder K by bolts. Here, FIG. 2 is a front view of the pallet fall prevention device 20, and FIG.
Indicates the state when the cover is removed. Also, FIG. 1 shows FIG.
FIG. 7 is a cross-sectional view taken along the line BB in FIG.
(B) shows the state when the lever is set.

As shown in FIGS. 1 and 2, the pallet fall prevention device 20 is provided with a mounting plate 22 having a screw hole 22 a for fixing the device 20 to the spar K, and is vertically provided from the mounting plate 22. A housing comprising a pair of side walls 24;
Resin covers 25 and 26 are attached to the front and rear surfaces, respectively. The cover 25 on the front side has an opening 25a through which a lever 28 described later is inserted and removed.

A lever 28 as a pallet receiving portion rotatably attached to a shaft 27 supported by both side walls 24 is provided inside the housing, and a lever 27 projects from a side wall of the lever 28 in parallel with the shaft 27. Mounting shaft 28a
A rod 30 swingably attached to the
, An electromagnetic solenoid 32 that attracts a movable iron core 31 to which one end of a rod 30 is swingably attached and lifts the rod 30 upward, and an L-shaped mounting bracket 34 fixed to the side wall 24 And a coil spring 36 fixed at one end to a mounting punch 35 formed of a screw screwed to the movable iron core 31 at the other end, and a lever 2
A micro switch (not shown) for detecting the movement of the lever 28 by contacting the mounting shaft 28a when the 8 moves to a predetermined position is provided.

A holding wall 38 as a holding member formed integrally with the side wall 24 is attached to a lower portion of the lever 28, and is adhered to a front surface of the holding wall 38 so as to slightly protrude from an upper portion of the holding wall 38. Rubber plate 40 is provided. Here, FIGS. 4A and 4B are explanatory diagrams showing the configuration of the electromagnetic solenoid 32, wherein FIG. 4A is a front view, and FIG. 4B is a side view including a partially broken surface.

As shown in FIG. 4, the electromagnetic solenoid 32
Is a magnetic coil 44 wound around a hollow bobbin 42,
The movable iron core 3 slidably inserted into the hollow portion of the bobbin 42
1, a ring-shaped flange 45 provided at each end of the hobbin 42, a case 46 for accommodating the bobbin 42, the magnetic coil 44, and the flange 45, and a mounting bracket 48 for fixing the case 46 to the side wall 24; And a lead wire 49 for energizing the magnetic coil 44.

An epoxy resin 50 is provided in the gap between the case 46 and the magnetic coil 44 in order to improve the heat radiation of the magnetic coil 44, secure the waterproof property, and prevent the magnetic coil 44 from rattling. Is filled. The case 46 and the flange 45 are made of the same magnetic material, and form a magnetic path for passing the magnetic flux generated by the magnetic coil 44 together with the movable iron core 31. Further, a screw hole 31a for fixing the rod 30 is provided at the tip of the movable iron core 31.
And a screw hole 31b for fixing the mounting punch 35 are formed.

In the electromagnetic solenoid 32 configured as described above, when the power is not supplied from the lead wire 49 and the magnetic coil 44 is not excited, the movable iron core 31
2 slides freely in the hollow part. On the other hand, when power is supplied from the lead wire 49 and the magnetic coil 44 is excited, the movable iron core 31 is attracted into the hollow portion of the bobbin 42, and FIG.
Is held in the position shown in FIG.

Next, the pallet fall prevention device 2 of this embodiment
The operation of 0 will be described. First, the electromagnetic solenoid 32
Is not excited, the movable iron core 31 is in a freely slidable state. For this reason, the lever 28 rotates by its own weight, and as shown in FIG. 1B, a position where the distal end of the lever 28 projects outside from the opening 25a of the cover 25 (hereinafter, referred to as a setting position). Is held.

The set position is defined by the gravity applied to the lever 28, the rod 30, and the movable iron core 31, and the movable iron core 31.
The position where the elastic force of the coil spring 36 stretched with the movement of the coil spring 36 is balanced.
8 and the rubber plate 40.

As described above, when the electromagnetic solenoid 32 is excited when the lever 28 is at the set position, the movable iron core 31 is attracted into the electromagnetic solenoid 32, and the rod 30 is pulled upward. As a result, lever 2
1 rotates as shown in FIG. 1A to a position where the whole is stored in the housing (hereinafter referred to as a retreat position).

At this time, the lever 28 (and the rod 30,
Since the movable iron core 31) is urged by the coil spring 36 in a direction to assist the rotation, the electromagnetic solenoid 32
The lever 28 can be rotated with a relatively small suction force. When the excitation of the electromagnetic solenoid 32 is stopped when the lever 28 is at the retracted position, the movable iron core 31 is again in a state in which it can freely slide. Therefore, the lever 28 includes the lever 28, the rod 30, and the movable iron core. It rotates by the gravity applied to 31 and returns to the set position.

At this time, the lever 28 (and the rod 30,
The movable iron core 31) is urged by the coil spring 36 in a direction opposite to the rotation, and thus slowly rotates to the set position. Then, it is finally held at the set position while vibrating in the vicinity of the set position. However, even if it vibrates in the vicinity of the set position, it only comes into contact with the rubber plate 40 but not with the holding wall 38,
The rotation stops without generating noise.

The pallet fall prevention device 20 is provided with a lever 28 held at a set position in the multi-story parking machine 2.
Are arranged so as to intersect with the ascent / descent route of the pallet 4,
When the chain 14 supporting the pallet 4 is broken, the pallet 4 is supported by the lever 28. At this time, the lever 28 pivots from the set position due to the weight of the pallet 4, but the holding wall 38 abuts on the lower portion of the lever 28 and the rotation of the lever 28 is stopped.
It is reliably supported without falling from the position.

When the pallet 4 is moved up and down, if the electromagnetic solenoid 32 is excited, the lever 28 can be retracted from the pallet 4 elevating path, so that the pallet 4 is not obstructed. As described above, in the pallet fall prevention device 20 of the present embodiment, the coil spring 36 that urges the lever 28 in the direction of rotating the lever 28 from the set position to the retracted position is provided, and the lever 28 moves from the retracted position to the set position. The moving speed at the time of moving is reduced, and the elastic force of the coil spring 36 and the gravitational force applied to the lever 28 (and the rod 30 and the movable iron core 31) correspond to the lever 28.
And the holding wall 38 at a set position where they do not come into contact with each other.

Therefore, according to the pallet fall prevention device 20 of this embodiment, when the lever 28 is rotated from the retracted position to the set position, the lever 28 is stopped at the set position without colliding with the holding wall 38. And as a result,
Generation of noise due to collision between the lever 28 and the holding wall 38 can be prevented.

In addition, the pallet fall prevention device 2 of this embodiment
According to No. 0, the movable iron core 31 can slide freely without providing a magnetic body or the like for improving the attraction force in the hollow portion of the electromagnetic solenoid 32 (bobbin 42). When the solenoid 32 is excited to suck the movable iron core 31, the movable iron core 31 does not generate a collision sound.

Although the electromagnetic solenoid 32 used in the present embodiment has a lower attractive force than an electromagnetic solenoid of a type in which a magnetic material is provided in the hollow portion of the bobbin 42, in the present embodiment, the coil spring 36 is attached. Since the lever 28 can be moved with a relatively small suction force by the force, the device can be configured without increasing the size of the electromagnetic solenoid 32 to generate the necessary suction force.

Further, the pallet fall prevention device 2 of the present embodiment
According to No. 0, since the covers 25 and 26 for covering the front and rear of the housing are made of resin, the device 20 can be reduced in weight, and moreover, the resin covers 25 and 26 can be used.
Since 26 does not resonate with the noise generated inside the housing, the noise can be reduced to the maximum.

Here, in the above embodiment, the coil spring 36
Is fixed to the mounting punch 35, and when the lever 28 is rotated from the retracted position to the set position, an urging force in a direction opposite to the rotation is applied to the lever 28 from the beginning of the movement. As shown in FIG. 5 (a), when the lever 28 is at the retracted position, the coil spring 36 and the mounting punch 35 are separated from each other, and the lever 28 rotates to move the movable iron core 31 to a predetermined length. 5B, the end of the coil spring 36 and the mounting punch 35 engage with each other, and thereafter the coil spring 36 generates an urging force in the direction opposite to the rotation, as shown in FIG. 5B. May be configured.

In this case, since the amount of deformation of the coil spring 36 is small, the durability of the coil spring 36 and the accuracy of the set position can be improved, and the reliability of the device 20 can be improved. it can. In the above embodiment,
Although the coil spring 36 is used, a zigzag spring 37 formed by bending a rod-shaped metal material two-dimensionally into a lightning bolt as shown in FIG. 6 may be used. One end of the zigzag spring 37 is fixed to the mounting bracket 34, and the other end where the elongated ring 37 a is formed is configured to loosely fit the mounting punch 35.

Then, as shown in FIG. 6 (a) (and the solid line in FIG. 6 (c)), the electromagnetic solenoid 32 is excited and the movable iron core 31 is attracted, whereby the lever (not shown here) is turned on. Is rotated to the retracted position, the zigzag spring 37 compressed by the mounting punch 35 engaged with the upper end of the ring 37a generates a biasing force in the direction of pushing down the movable iron core 31, and the lever pivots more than necessary. To prevent them from getting lost. That is, if the lever is rotated too much from the predetermined retracted position, the lever may rotate in the opposite direction when the excitation of the electromagnetic solenoid 32 is stopped, or may not be able to rotate and may remain stopped. Therefore, such a situation is prevented from occurring.

On the other hand, as shown in FIG. 6B (and the dotted line in FIG. 6C), when the excitation of the electromagnetic solenoid 32 is stopped, the lever rotates and the movable iron core 31 is moved from the electromagnetic solenoid 32. When pulled out by a predetermined length, the ring 3
The zigzag spring 37 stretched by the mounting punch 35 engaged with the lower end of the lever 7a generates an urging force in a direction in which the movable iron core 31 is pulled up, that is, in a direction opposite to the rotation of the lever.

As shown in FIG. 5, a ring 37a is formed at one end, and the zigzag spring 37 is used to loosely fit the mounting punch 35 with the ring 37a.
In addition to obtaining the same effect as when the coil spring 36 shown in (1) is used, the lever does not rotate more than necessary when the electromagnetic solenoid 32 is excited. Can be turned to the set position, and the reliability of the device can be improved.

The zigzag spring 37 is bent two-dimensionally, and has an extremely thin shape as shown in FIG. 6C when viewed from the side. The arrangement can be suitably performed, and the size of the apparatus can be reduced. Next, a second embodiment will be described.

The pallet fall prevention device 20a of the present embodiment.
Is a coil spring 36 (and the attachment 3 attached thereto).
4, except that a torsion spring 52 is used instead of using the mounting punch 35).
Is exactly the same as That is, as shown in FIGS. 7 and 8, the pallet fall prevention device 20a of this embodiment
A torsion spring 52 is wound around the torsion spring 52. One end of the torsion spring 52 is fixed to a fixing hole 24a formed in the side wall 24 so that the torsion spring 52 does not rotate. 28a.

In FIG. 8, the holding wall 38 and the rubber plate 40 are omitted in order to make the structure of the torsion spring 52, which is a feature of the present embodiment, easy to see. The torsion spring 52 is in a relaxed state when the lever 28 is at the retracted position shown in FIG. 7A, and when the lever 28 is turned toward the set position shown in FIG. Is generated, and the lever 28 is urged in a direction opposite to the rotation. In addition, when the electromagnetic solenoid 32 is not excited, the lever 28 moves due to gravity applied to the lever 28, the rod 30, and the movable iron core 31;
Position where the elastic force of the torsion spring 52 is balanced (set position)
The setting position is the holding wall 38 and the rubber plate 4
It is set so as not to touch 0.

That is, the operation of the pallet fall prevention device 20a is exactly the same as that of the first embodiment, except that the type of spring used and the mounting position of the spring are different from those of the first embodiment. Therefore, the pallet fall prevention device 20 of the present embodiment is
In the case of a, the same effect as in the first embodiment can be obtained.

In this embodiment, the torsion spring 5
When the lever 28 rotates by a predetermined amount instead of fixing one end of the mounting shaft 28a to the mounting shaft 28a, the torsion spring 52 and the mounting shaft 28a engage, and the urging by the torsion spring 52 is started from that position. You may comprise so that it may be.

Next, a third embodiment will be described. The pallet fall prevention device 20b of the present embodiment differs from the pallet fall prevention device 20a of the second embodiment only in part of the shape of the torsion spring and the configuration of the lever. Therefore, only the different portions will be described.

As shown in FIG. 9, in the pallet fall prevention device 20b of this embodiment, the lever 28 is
A regulating shaft 28b protruding in parallel with the mounting shaft 28a is provided on an upper portion of a surface facing the upper end of the mounting shaft 28a. And the regulation axis 2
A rubber ring 29 is attached to one end of 8b. When the lever 28 is freely rotated, the rubber ring 29 comes into contact with the upper end of the holding wall 38 before the lever 28.

On the other hand, the torsion spring 53 projects between the main body 53a disposed around the shaft, a fixing portion 53b having a long hole capable of being screwed, and the mounting shaft 28a and the rubber ring 29. Contact portion 53c. The tip of the contact portion 53c is coated with a resin so as to absorb a shock when the mounting shaft 28a comes into contact.

The torsion spring 53 is fixed to the fixing portion 53b.
Is fixed to the side wall 24 by a screw 54 which is screwed into a screw hole 24b formed in the side wall 24 by passing through. 9A, similarly to FIG. 8, in order to make the configuration of the torsion spring 52, which is a characteristic part of the present embodiment, easy to see,
The holding wall 38 is omitted.

In the pallet fall prevention device 20b configured as described above, when the electromagnetic solenoid 32 is not excited, the lever 28 rotates by its own weight to a set position where the tip of the lever 28 projects from the housing. At this time, as shown in FIG. 9C, the torsion spring 53 comes into contact with the mounting shaft 28a to generate an urging force in the direction opposite to the rotation, and
The lower end of the lever 28 and the rubber ring 29
8 so as not to come into contact therewith.

On the other hand, when the electromagnetic solenoid 32 is excited, the movable iron core 31 is attracted, and the lever 28 is turned off.
Pivots to a retracted position where its tip is retracted into the housing. At this time, as shown in FIG. 9B, the torsion spring 53 contacts the rubber ring 29 to prevent the lever 28 from rotating more than necessary.

As described above, according to the pallet fall prevention device 20b of this embodiment, when the lever 28 rotates from the retracted position to the set position, the mounting shaft 28a comes into contact with the torsion spring 53, and And the lever 28 is held at a position where the lever 28 and the holding wall 38 do not come into contact with each other. Can be prevented.

The pallet fall prevention device 2 of this embodiment
0, the electromagnetic solenoid 32 is excited and the lever 2
8 rotates from the set position to the retracted position,
8b is a rubber ring 29 attached to the torsion spring 53.
And the lever 28 is prevented from pivoting more than necessary. When the excitation of the electromagnetic solenoid 32 is stopped, the lever 28 can be pivotally moved to the set position without fail. Reliability can be improved.

Further, in this embodiment, the resin coated on the tip of the contact portion 53c absorbs the impact at the time of collision between the contact portion 53c and the mounting portion 28a, and the rubber ring attached to the regulating shaft 28b. 29 absorbs an impact at the time of collision between the contact portion 53c and the rubber ring 29, so that noise during operation can be further reduced.

Further, in this embodiment, the torsion spring 53 is used.
Is fixed to the side wall 24 by attaching the screw 54 to the long hole of the fixing portion 53b, so that the attachment position of the torsion spring 53 can be adjusted. For this reason, even if the elasticity of the torsion spring 53 is deteriorated by repeated use, and the lever 28 comes into contact with the holding wall 38 to generate noise, the mounting position of the torsion spring 53 is adjusted. Thus, the lever 28 and the holding wall 38 can be reset so that they do not come into contact with each other, and can be used for a long period of time without exchanging parts (torsion springs 53).

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating the configuration and operation of a pallet fall prevention device according to a first embodiment.

FIG. 2 is a front view of the pallet fall prevention device of the first embodiment.

FIG. 3 is an explanatory diagram showing an outline of a multi-story parking machine to which a pallet fall prevention device is applied.

FIG. 4 is a front view and a side view including a partially broken cross section of the electromagnetic solenoid.

FIG. 5 is an explanatory diagram showing another mounting state and operation of the coil spring.

FIG. 6 is an explanatory diagram showing an attached state and operation when a zigzag spring is used instead of a coil spring.

FIG. 7 is a sectional view illustrating the configuration and operation of a pallet fall prevention device according to a second embodiment.

FIG. 8 is a front view of a pallet fall prevention device according to a second embodiment.

FIG. 9 is an explanatory diagram illustrating a configuration and an operation of a pallet fall prevention device according to a third embodiment.

[Explanation of symbols]

2: Multi-level parking machine 4: Pallet 6: Elevating mechanism 8: Motor 10: Control device 12, 1
3: Sprocket 14, 15: Chain 16, 17: Drive shaft 20, 20a, 20b: Pallet fall prevention device 2
2. Mounting plate 24 ... Side wall 25, 26 ... Cover 27 ...
Shaft 28 ... Lever 28a ... Mounting shaft 28b
... Regulatory shaft 29 ... Rubber ring 30 ... Rod 31 ...
Movable iron core 32 ... Electromagnetic solenoid 34 ... Mounting bracket 35 ...
Mounting punch 36 ... Coil spring 37 ... Zigzag spring 38 ...
Holding wall 40 rubber plate 42 bobbin 44
Magnetic coil 45 ... Flange 46 ... Case 48 ...
Mounting bracket 49: lead wire 50: epoxy resin 52,
53 ... Torsion spring

Claims (6)

[Claims] A pallet receiving portion rotatably attached to a predetermined support shaft and formed so as to be able to protrude into an elevating path of a pallet on which an automobile is mounted; and a pallet receiving portion abutting on the pallet receiving portion. A holding member for holding the unit at a set position protruded from the pallet lifting path, and in accordance with an external command, rotating the pallet receiving unit in a direction to separate the pallet from the holding member. An actuator for holding the pallet at a retreat position that does not intersect, wherein when the pallet receiving portion is rotated from the retreat position to the set position by its own weight, the pallet receiving portion is
A pallet fall prevention device provided with a spring member for urging in a direction for preventing rotation by an elastic force. 2. The elastic force of the spring member is balanced with gravity applied to the pallet receiving portion near the holding member,
2. The apparatus according to claim 1, wherein the holding member is set to be held at a position away from the pallet receiving portion.
A pallet fall prevention device according to the item. 3. The pallet drop according to claim 1, wherein the spring member generates an elastic force only when the pallet receiving portion is within a predetermined section near the holding member. Prevention device. 4. The apparatus according to claim 1, wherein the spring member is a telescopic spring supporting the pallet receiving portion or a movable portion of the actuator that operates together with the pallet receiving portion. A pallet fall prevention device according to any one of the above. 5. The pallet fall prevention device according to claim 1, wherein the spring member is a torsion spring wound around the support shaft. 6. The above-mentioned actuator drives the pallet receiving portion via a magnetic coil wound in a ring shape and a link member slidably inserted into a hollow portion of the magnetic coil and connected to one end. The pallet fall prevention device according to any one of claims 1 to 5, further comprising: a movable iron core, wherein the movement of the movable iron core is not restricted. .