JP2993633B2 - Fall prevention device for displacement body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for displacing up and down and for preventing a displacement body held at a predetermined height from falling from a holding position. The present invention provides, for example, a pallet on which a vehicle is placed as the displacement body, and the pallet is moved up and down or tilted so that the vehicle can be stored in a plurality of stages on and below the pallet. This is a suitable technique when applied to an apparatus.

[0002]

2. Description of the Related Art A parking device as described above (for example, Japanese Patent Publication No.
In Japanese Patent Application Laid-Open No. 2-40496, there is a risk that the pallet held at a predetermined height may drop unexpectedly.

In order to avoid such a situation,
Conventionally, there has been provided an apparatus for preventing the pallet from unexpectedly dropping from a holding position at a predetermined height as an abnormal situation.

Conventionally, the fall prevention device is generally provided with a pallet rotatably provided on a fixed portion slightly below a holding position of a predetermined height of the pallet so as to protrude into a displacement passage of the pallet and stop there. A receiving member is provided.
The receiving member waits below the pallet at the holding position at a predetermined height, and in a case of emergency, supports the pallet from below to prevent the pallet from falling.

When the pallet is normally displaced downward, the receiving member must be retracted from the displacement passage of the pallet so as not to hinder the downward displacement operation. Therefore, conventionally, a plunger connected to the receiving member and a solenoid for operating the plunger are provided, and these are electrically controlled to rotate the receiving member when the pallet is normally displaced downward. There has been proposed a device in which this is retracted from the displacement passage (for example, see Japanese Utility Model Publication No. 62-29546, etc., filed by the present applicant).

[0006]

However, in the above-described conventional configuration, a solenoid, which is an electric component, is used, and the downward movement of the pallet and the energization of the solenoid are controlled in conjunction with each other. Because of the need, the cost was inevitable.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a problem to be solved is to provide an apparatus for preventing a displacement body from falling, which can reduce cost without lowering safety. is there.

[0008]

In order to solve the above problems, the present invention uses the following means.

A device for displacing up and down and preventing a displacement body held at a predetermined height from dropping from a holding position, wherein the displacement body protrudes into a displacement passage of the displacement body and stops. A receiving member rotatably provided on the fixed portion side slightly below the holding position, a retracting operation member for rotating the receiving member to retreat from the displacement passage of the displacement body, A restricting member that engages with the receiving member retracted from the displacement passage and restricts the receiving member in a state of being retracted from the displacement passage of the displacement body, and one end of the restricting member enters and exits the displacement passage of the displacement body. A swing member provided vertically below the receiving member so as to be vertically swingable, and the swing member and the restraining member are operatively connected to each other, and one end of the swing member is swung by the displacement operation of the displacement body. Move A displacement body fall prevention apparatus comprising and a connecting member allowed to release the restraint of the receiving member by said restraining member to transmit the force to the restraining member when.

In a normal state, one end of the swinging member is displaced from the displacement passage of the displacement body as in a first embodiment described later, and the receiving member is restrained by the restraining member. Only when it is present, one end can be configured to be located in the displacement passage, and as in the second embodiment and the following embodiments, the one end is always kept except when it is rocked by the displacement body. May be arranged in the displacement passage.

The restraining member, the swinging member, and the connecting member may be configured such that when the displacement body is displaced downward, the restraining of the receiving member by the restraining member is released. In addition, it is also possible to configure so that the restraint of the receiving member by the restraint member is released when the displacement body is displaced upward.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings.

In this embodiment, a tilting multi-story parking device will be described as an example of a machine provided with the device for preventing a displacement body from falling according to the present invention. First, an outline of the tilting multi-story parking device will be briefly described. In the following description, for convenience, the front, rear, left, and right directions are based on the directionality of a vehicle entering in a forward operation and exiting in a reverse operation.

The parking device shown in FIGS. 1 to 3 includes a base member 1 arranged on the ground GL. A pallet support member 2 is attached to a front (rear) end 1a of the base member 1.
Is erected. The pallet support member 2 supports a front end 4a of a tilting pallet 4 for mounting on a vehicle at a predetermined height via a horizontal pivot shaft 3 in the left-right direction.

The tilting pallet 4 as a displacement body has a front-rear length and a left-right width enough to mount the vehicle C1.
The rear side is vertically movable around the horizontal pivot shaft 3, and is tiltable about the horizontal pivot shaft 3 as a whole. The tilting pallet 4 has a rear end 4b that is in contact with the ground GL and has a tilt angle with respect to the ground GL of 10.4 when the vehicle is in or out of the vehicle (at the position shown by a two-dot chain line in FIG. 1). , The inclination angle with respect to the ground GL is set to, for example, about 14.5 ° when the rear end 4b is lifted upward and the vehicle is in the stored state (the position shown by the solid line in FIG. 1), and the vehicle enters and leaves the vehicle. The vehicle tilts between a normal attitude and the stored attitude.

The tilting pallet 4 has a wheel stopper 5 on the front side of the upper surface.

As shown in FIG. 2, a driven column 6 and a driving column 7 are provided upright on both left and right sides on the rear side of the tilting pallet 4. Each of these posts 6, 7
The lower end is firmly fixed to the base member 1. The tilt pallet 4 tilts along these columns 6,7.

At least the driving-side column 7 of the columns 6 and 7 is formed of a steel material having a U-shaped cross section. The drive-side column 7 is arranged with its open part facing the right side of the tilting pallet 4. An electric motor 9 with a speed reducer that can rotate forward and reverse is arranged at the upper end of the drive-side support 7 as a motor that applies a tilting driving force to the tilting pallet 4 via a chain 8 as a flexible interlocking member. Have been. A drive sprocket 10 having a rotating shaft 10a parallel to the horizontal pivot shaft 3 is operatively connected to the electric motor 9, and the chain 8 is wound around an upper side of the drive sprocket 10.

The parking device is provided with appropriate detecting means 11 and 12 for detecting that the tilting pallet 4 is in the storage position and the vehicle entry / exit position. The electric motor 9 includes, for example, the drive-side support 7.
When the driver operates the ascending operation switch SU and the descending operation switch SD (see FIG. 1 respectively) provided on the outer surface side of the motor, the engine is started in the normal rotation direction or the reverse rotation direction. In response to the signal, the chain 8 is controlled so as to automatically stop the winding or unwinding operation.

As the detecting means 11 and 12, for example, limit switches are employed. The illustrated parking device includes a limit switch 11 for stopping a chain winding operation as first detecting means and a limit switch 12 for stopping a chain winding operation as second detecting means.

In the limit switch 11 for stopping the chain winding operation, the switch body 11a is fixed to the upper part of the driving support post 7, and the switch lever 11b projects horizontally into the displacement passage R of the tilt pallet 4. (See FIG. 2). The switch lever 11b
When the tilting pallet 4 which is displaced upward is in the posture when retracted into the vehicle, the tilting pallet 4 comes into contact with the right side of the tilting pallet 4 to actuate the switch body 11a.

The limit switch 12 for stopping the chain unwinding operation will be described later.

The tilting pallet 4 has a driving support 7
(The right side in the illustrated example) is provided with a driven sprocket 13 as a rotating body. The rotating shaft 13a of the driven sprocket 13 is parallel to the rotating shaft 10a of the driving sprocket 10. The driven sprocket 13
Is located inside the drive-side support column 7 having a U-shaped cross section. The driven sprocket 13 is connected to the driving sprocket 10 via the chain 8.

As shown in FIG. 3, one end 8 of the chain 8 wound around the upper side of the drive sprocket 10
The a-side is fixed to an appropriate position of the driving-side support post 7, leaving a sufficient margin for the tilting pallet 4 to tilt. On the other hand, the other end 8b side of the chain 8 is wound around the lower side of the driven sprocket 13 and extended upward, and is connected to the upper part of the driving side support 7 as follows.

A small steel plate 24 as a support member is firmly fixed in a horizontal state on the upper part of the drive-side column 7. The steel plate 24 has a through hole 25 in the vertical direction substantially at the center. A rod member 26 having a head 26a is inserted into the through hole 25 from above. The area of the lower surface of the head 26a of the rod member 26 is larger than the area of the through hole 25. The head 26a of the rod member 26 functions as a stopper for preventing the rod member 26 from dropping out of the through hole 25, and also functions as a receiving portion for urging means described later.

The other end 8b of the chain 8 is connected to the lower end 26b of the rod member 26. The steel plate 24 and the bar member 26 cooperate with each other to hold the other end 8b of the chain 8 on the fixed portion (drive-side column 7) side against the load of the tilt pallet 4. Works.

The head 26a of the rod member 26 and the steel plate 2
4, a compression coil spring 27 is interposed. The compression coil spring 27 functions as an urging means for applying an urging force to the rod member 26 in an upward direction. As the compression coil spring 27, one having a biasing force smaller than the load on the tilt pallet 4 and larger than the load on the chain 8 is employed. Therefore, the chain 8
When the load on the tilt pallet 4 is applied to the vehicle (that is, when the tilt pallet 4 is tilting, and when the tilt pallet 4 is held in the vehicle storage position), The compression coil spring 27 is completely compressed by losing the load of the tilt pallet 4. On the other hand, after the tilting pallet 4 is in the vehicle loading / unloading posture and the load of the tilting pallet 8 is no longer applied to the chain 8, the compression coil spring 27 overcomes the load of the chain 8 and The member 26 is pushed up.

Above the rod member 26, the limit switch 12 for stopping the chain unwinding operation is provided. The limit switch 12 has a switch main body 12a fixed to the drive-side support post 7, and a switch lever 12b extending right above the rod member 26 from a lateral direction. The rod member 26 comes into contact with the switch lever 12b by being displaced upward. As a result, the switch body 12a stops the unwinding operation of the chain 8 by the electric motor 9.

As shown in FIG. 2, the tilt pallet 4
Has balance pulleys 14 and 15 having support shafts 14a and 15a in the front-rear direction on both left and right sides of the lower surface on the rear side. These pulleys 14 and 15 have
One balance wire 16 is wound. The balance wire 16 has its upper end 16a fixed to the upper end of the driven-side support 6 and extends downward, and is wound from below on a pulley 14a on the driven-side support 6 side (the left side in the illustrated example). After the tilting pallet 4
Is stretched in the width direction thereof, and is then wound around a pulley 15 on the side of the drive-side support column 7 from above, pulled down directly below, and in a tensioned state, the lower end 16 thereof.
b is fixed to the base member 1.

Note that sprockets and chains can be used instead of the pulleys 14 and 15 and the wire 16.

The parking device constructed as described above operates as follows.

When the vehicle C1 is stored on the tilting pallet 4, the vehicle C1 is driven forward and self-propelled on the tilting pallet 4 having the attitude at the time of loading and unloading the vehicle, and the driver (user) Get off.

When the driver gets off the vehicle, he turns on the lifting operation switch SU in order to raise the rear side of the tilting pallet 4. Then, the electric motor 9 operates to drive the drive sprocket 10, and one end of the chain 8 is wound. Thereby, the driven sprocket 13
While acting as a moving pulley, the rear side of the tilting pallet 4 is raised.

Here, the chain 8 lifts only the side of the driving column 7 out of the tilting pallet 4, but the tilting pallet 4 always tilts while maintaining the right and left balance. This is due to the action of the balance wire 16 and the balance pulleys 14, 15.

That is, when one end of the chain 8 is wound by the rotation of the driving sprocket 10,
The pulley 15 on the right side of the tilting pallet 4 is acted upon by a force for lifting the pulley 15 upward. The right pulley 15 is lifted upward while rotating clockwise as viewed in FIG. 2 and while extending the right portion of the balance wire 16 in a tensioned state upward. Then, the length of the balance wire 16 from the upper fixed end 16a to the right pulley 15 gradually decreases, so that the left pulley 14 rotates counterclockwise as viewed in FIG. It is forcibly pulled up at the same speed as the pulley 15 on the right side.

When the tilting pallet 4 is in the storage position, the chain winding operation stop limit switch 11 is actuated to stop the electric motor 9 and stop the upward displacement operation of the tilting pallet 4. I do.
Another vehicle C2 is parked below the tilt pallet 4.

Conversely, when leaving the vehicle C1, after the vehicle C2 leaves the warehouse, the user of the vehicle C1 turns on the lowering operation switch SD. Then, the electric motor 9 rotates in the direction of unwinding the chain 8, and the rear side of the tilting pallet 4 is displaced downward around the horizontal pivot shaft 3 at the front end 4a.

When the tilting pallet 4 is in the retracted posture and the vehicle is being displaced vertically,
The load of the tilt pallet 4 is applied to the chain 8. For this reason, the bar member 26 to which the other end 8b side of the chain 8 is connected is pulled down by a force larger than the upward urging force of the compression coil spring 27, and is held by the steel plate 24.

When the chain 8 is unwound and the tilting pallet 4 reaches the vehicle loading / unloading posture, the load of the tilting pallet 4 on the chain 8 becomes zero. Thereafter, since the chain 8 is unwound, the bar member 26 is pushed upward by the urging force of the compression coil spring 27. The head 26a of the rod member 26 comes into contact with the switch lever 12b of the limit switch 12 for stopping the operation of unwinding the chain. Then, the limit switch 12 is operated, and the operation of unwinding the chain of the electric motor 9 is stopped.

Note that a wire rope can be used instead of the chain 8. In this case, the driving sprocket 10 is changed to a drum and the driven sprocket 13 is changed to a pulley.

Next, the structure of the device for preventing the displacement body from falling according to the first embodiment will be described with reference to FIGS. 4 is a partially cutaway perspective view of the fall prevention device according to the first embodiment, FIG. 5 is a partially cutaway front view of FIG. 4, and FIG. It is the front view with a part broken which showed the part clearly.

As shown in these figures, the fall prevention device according to the first embodiment includes an arm 17 as a receiving member. The arm 17 functions to support the tilting pallet 4 in the vehicle storage position from below and prevent the tilting pallet 4 from dropping, for example, when the chain 8 is broken.

The arm 17 is provided on the inner surface side of the drive-side column 7 as a fixed portion. The upper limit stop position of the tilting pallet 4 shown in FIGS. ) (See FIG. 1). The arm 17 is freely rotatable between predetermined angles so that it can protrude into the displacement passage R of the tilting pallet 4 and can retreat therefrom.

The arm 17 has an arm support shaft 18 in the front-rear direction (a direction perpendicular to the paper surface in FIGS. 5 and 6) serving as a center of rotation, and two plate-like supports for both ends of the support shaft 18. The support bracket 19 (one of the two is not shown) is attached to the inner surface side of the U-shaped drive-side support column 7. The bracket 1
There is an appropriate gap between the pieces 9 and the arm 17 is located within this gap.

In the normal state, the end 17a of the arm 17 projects into the displacement passage R. For example, in the illustrated example, the center of gravity G of the arm 17 is positioned closer to the displacement passage R of the tilting pallet 4 than the arm support shaft 18 (see FIG. 6). For this reason, the arm 17
In a normal state, the tip portion 17a is rotated by an own weight so as to descend in an arc and protrudes into the displacement passage R. An arm stopper 20 is fixedly provided on the bracket 19 to abut on the arm 17 rotating downward and stop the arm 17 at a fixed position. When the arm 17 stops and comes into contact with the arm stopper 20, the tilt pallet receiving surface 17b on the tip portion 17a side of the arm 17 faces upward and is located in the displacement passage R of the tilt pallet 4.

When the arm 17 is in a stopped state in contact with the arm stopper 20, the arm 17 has a slope 17c extending upward smoothly from the outside to the inside of the displacement passage R of the tilt pallet 4. Have. FIG.
As shown in (2), when the tilt pallet 4 is displaced upward, the tilt pallet 4 comes into contact with the inclined surface 17c from below. Then, the tilting pallet 4 displaced upwardly lifts the arm 17 so as to rub the inclined surface 17c.
Is rotated upward to release the arm 17 from the displacement passage R of the tilting pallet 4. After passing through the tilting pallet 4, the arm 17 projects again into the displacement passage R and stops.

As a means for projecting the distal end portion 17a side of the arm into the displacement passage R in a normal state, a biasing means such as a suitable spring (not shown) may be used. In this case, the center of gravity G of the arm 17
There is no restriction on the position of.

When the tilting pallet 4 in the vehicle storage position is normally displaced downward, it is necessary to retract the arm 17 from the displacement passage R of the tilting pallet 4. Therefore, the fall prevention device according to the first embodiment is provided with a retreat operation member for manually rotating the arm 17 to retreat from the displacement passage R of the tilt pallet 4.

Various examples of the retreating operation member are conceivable. In the illustrated example, the lower projecting portion 17d formed at the lower portion of the arm 17 is pressed to turn the tip portion 17a side of the arm 17 upward. A push rod 21 to be moved is employed.

The push rod 21 has a horizontal axis perpendicular to the axis of the arm support shaft 18, and is provided so as to penetrate the driving support column 7 in the left-right direction. At the outer end of the push rod 21, there is a head 21a. When the head 21a is pressed by a finger, the tip 2a of the push rod 21 is advanced in the axial direction.
1b pushes the lower projecting portion 17d of the arm 17.
In this manner, the arm 17 is forcibly rotated in the direction to withdraw from the displacement passage R.

The push rod 2 inserted between the push rod 21 and the driving support
A return spring 22 for pushing back the arm 1 can be provided. Also, when the arm 17 returns to its stop position by its own weight or a spring force without taking such a means, the return force causes the push-back operation. The rod 21 may be pushed back.

The fall prevention device engages with the arm 17 retreated from the displacement passage R of the tilting pallet 4 by operating the push rod 21 and
7 is provided with a restraining member for restraining 7 from being retracted from the displacement passage R of the tilting pallet 4. In the illustrated example, a hook 23 is employed as the restraining member.

The hook 23 is located between the brackets 19 like the arm 17 and is connected to the arm 1.
7. The hook 23 is a hook support shaft 24 parallel to the arm support shaft 18 and is rotatably attached to the bracket 19 at one end thereof.

The rotating end 2 at the other end of the hook 23
A downward force is applied to 3a by its own weight or an appropriate spring. This downward force is transmitted to a swing member 28 described later via a connecting member 30 described later. Accordingly, one end 28a of the swing member 28 is swung upward and abuts on the driving-side support column 7. As a result, in the normal state, the hook 23 holds the predetermined arm restraining standby posture shown in FIGS.

Here, the predetermined arm restraint standby posture is
When the arm 17 is forcibly retracted from the displacement passage R of the tilting pallet 4 by pushing the push rod 21, the arm 17 can automatically engage with the arm 17.

The hook 23 has a claw 27 at a lower portion on the side of the rotating end 23a, and the hook 23 has
a has an engagement guide surface 23c that is smoothly continuous from the distal end surface 23b to the claw portion 27. On the other hand, on the hook 23 side of the distal end portion 17a of the arm 17, an engaged portion 17f that engages with the claw portion 27 is formed. The engaged portion 17f has, at an upper portion thereof, an engagement guide surface 17e that matches the engagement guide surface 23c of the hook 23.

When the push rod 21 is pushed, the arm 17 is forcibly rotated, and the engaged portion 17f of the arm 17 is pressed toward the hook 23. At this time, the engagement guide surface 17e of the engaged portion 17f rubs the engagement guide surface 23c of the hook 23, and the rotation end 23a side of the hook 23 is rotated upward.
As a result, the claw portion 27 of the hook 23 is
Automatically engages with the engaged portion 17f. Thus, the arm 17 is restrained while being retracted from the displacement passage R.

A swing member 28 is provided below the arm 17. The swing member 28 is supported at the lower portion of the bracket 19. One end 28a of the swing member 28 is swingable up and down with its support shaft 29 as a center. The swing member 28 is arranged so that the one end 28a draws an arc centered on the support shaft 29 by entering and exiting the displacement passage R by swinging up and down.

The swing member support shaft 29 is provided on the swing member 2.
8 are located at portions other than both ends. Therefore, the one end 28a and the other end 28b of the swing member 28 swing vertically around the support shaft 29 in the opposite direction. A downward force is applied to one end 28a of the swing member 28 by its own weight or an appropriate spring.

The other end 28b of the swing member 28 is connected to the pivoting end 23a of the hook 23 by a connecting member 30.
And operatively connected. When a downward external force acts on one end 28a of the swinging member 28, the connecting member 30 transmits an upward force generated on the other end 28b side to the hook 23, and the connecting member 30 It functions to release the restraint of the arm 17.

In the illustrated example, the connecting member 30 is formed of an outer tube 31 and an inner tube 32 which are fitted in a stretchable manner. The upper end of the outer tube 31 is rotatably connected to a turning end 23a of the hook 23 by an upper connecting shaft 33, and the lower end of the inner tube 32 is connected to the other end 28b of the swing member 28 by a lower end. It is rotatably connected by a shaft 34. The outer cylinder 31
Is provided with an inner cylinder stopper 35 which forms a receiving limit of the inner cylinder 32 in the upper part thereof. When the upper end of the inner cylinder 32 is in contact with the inner cylinder stopper 35, the connecting member 30 is in the shortest state.

The specific example of the inner cylinder stopper 35 may be any configuration, but in the illustrated example, from the viewpoint of simplification of the configuration, the upper connecting shaft 33 is passed through the upper end of the outer cylinder 31 and A part of the upper connecting shaft 33 is used as the inner cylinder stopper 35.

The predetermined arm restraining standby posture of the hook 23 is maintained by the one end 28a of the swinging member 28 abutting on the driving support 7 and the swinging thereof is regulated.

That is, as shown in FIGS. 5 and 6, the downward moment F1 acting on the upper connecting shaft 33 is given by M1 around the hook support shaft 24,
The moment about the swing member support shaft 29 of the downward force F2 acting on one end 28a of the shaft 8 is M2, and the upward force F3 of the swing member support shaft 29 acting on the lower connection shaft 34 is M2.
Assuming that the moment around is M3, M2 = M
3. Therefore, the magnitudes of the forces F1 and F2 and the arm lengths of the moments are set so that M1> M3 (= M2) is always satisfied.

As a result, the difference between the moment M1 and the moment M2 (= M3) causes the swing member 2
The state in which one end 28a of 8 is in contact with the driving-side support post 7 is maintained, and the predetermined arm restraining standby posture of the hook 23 is maintained.

When the hook 23 is in the arm restraining standby posture, the entire swing member 28 is outside the displacement passage R of the tilt pallet 4.

On the other hand, when the hook 23 restrains the arm 17, one end 28 a of the swing member 28
It is located inside the displacement passage R and stopped. This is because the engaged portion 17f of the arm 17 is
When the hook 23 is engaged with the claw portion 27, the hook 23 is forcibly rotated upward. The upward rotation of the hook 23 allows the one end 28a of the swing member 28 to rotate downward. Thereby, the swing member 2
The one end 28a of 8 descends in an arc centered on the swing member support shaft 29. When the hook 23 is in the arm restraining position, one end 28a of the swing member 28
Are stopped in the displacement passage R.

The operation of the fall prevention device according to the first embodiment configured as described above will be described.

First, as shown in FIGS. 4 to 6, when the tilting pallet 4 is held in the storage position, the arm 17 protrudes into the displacement passage R of the tilting pallet 4. Stopped at. Therefore, even in the event of an unexpected event such as the chain 8 being broken, the worst case is avoided because the arm 17 prevents the tilting pallet 4 from falling.

At this time, the one end 28a of the swinging member 28 abuts on the driving-side support post 7, so that the hook 23 maintains the predetermined arm restraining standby posture.

Referring to FIG. When the tilting pallet 4 is displaced downward to the vehicle loading / unloading posture in order to take out the vehicle C1 on the tilting pallet 4 or the like, the push rod 2 protruding outside the driving side support 7 is
The user presses 1 with a finger. Then, the downward projecting portion 17d of the arm 17 is pushed by the distal end portion 21b of the push rod 21, and the distal end portion 17d of the arm 17 is pushed.
The “a” side rotates upward in a circular arc centered on the arm support shaft 18 and retreats from the displacement passage R of the tilting pallet 4.

At this time, the engagement guide surface 17e of the engaged portion 17f formed on the arm 17 rubs the engagement guide surface 23c of the hook 23 in the arm restraining standby posture, so that the hook 23 Is rotated upward. Eventually,
As shown in FIG. 8, the claw portion 27 of the hook 23 automatically engages with the engaged portion 17f of the arm 17, whereby the arm 17 is restrained in a state of being retracted from the displacement passage R. You.

In response to the upward rotation of the hook 23 accompanying the engagement operation with the arm 17, the swing member 28
End 28a descends in an arc. This swing member 2
When the hook 23 is in the arm restraining posture, the one end 28a of the hook 8 is stopped in the displacement passage R of the tilting pallet 4.

Next, the user turns on the lowering operation switch SD and rotates the electric motor 9 in the unwinding direction of the chain 8. Thereby, the tilt pallet 4 is displaced downward.

When the tilt pallet 4 is displaced downward from the storage position of the vehicle, if the user accidentally turns on the lowering switch SD without pushing the push rod 21, the arm 17 And the downward displacement operation of the tilting pallet 4 is forcibly interrupted. As a result, as in the case where the tilting pallet 4 is in the posture at the time of entering and leaving the vehicle, the compression coil spring 27
By the action of the above, the rod member 26 is displaced upward, and the chain unwinding operation stop limit switch 12 works,
The operation of the electric motor 9 stops. In this case, the user only has to turn on the raising operation switch SU, return the tilting pallet 4 to the posture at the time of storing the vehicle once, and then perform an appropriate lowering operation again.

Referring to FIG. The tilt pallet 4
After passing down the side of the arm 17, it comes into contact with one end 28 a of the swing member 28. One end 28a of the swing member 28 is pushed down by the tilt pallet 4 and swings downward to escape. At the same time, the other end 28b of the swinging member 28 swings upward, and the inner cylinder 3
Push 2 upward. At this time, since the upper end of the inner cylinder 32 is in contact with the inner cylinder stopper 35 inside the outer cylinder 32, the outer cylinder 32 is also pushed up. Then
The hook 23 is forcibly rotated upward through the upper connection shaft 33, and the engagement between the claw portion 27 of the hook 23 and the engaged portion 17f of the arm 17 is released. The arm 17 rotates, and the displacement path R of the tilt pallet 4 is moved.
To return to the stopped state.

When the tilt pallet 4 passes through the swing member 28, the action of the external force on the swing member 28 is stopped. Therefore, the hook 23 is moved until one end 28a of the swing member 28 rotates upward and comes into contact with the driving-side support 7.
Pivots downward and returns to the arm restraining standby posture (FIG. 6).
reference).

Referring to FIG. The tilting pallet 4
When it is displaced upward, it contacts the inclined surface 17c of the arm 17 after passing upward on the side of the swing member 28. The tilting pallet 4 is rotated so as to rub the inclined surface 17c of the arm 17, and passes upward while allowing the arm 17 to escape from the displacement passage R.

When the upward movement of the tilt pallet 4 is completed, the arm 17 projects again into the displacement passage R and stops. The tilting pallet 4 stops in the posture when the vehicle is stored.

The arm 17 is not restrained by the hook 23 when the arm 17 is released from the displacement passage R by the tilting pallet 4 displaced upward. This is because the rotation angle of the arm 17 is not as large as when the arm 17 is forcibly rotated by the operation of the push rod 21.

In the first embodiment, the connecting member 30 is formed to be extendable and contractable for the following reasons.

That is, it is assumed that the push rod 21 is erroneously pushed when the tilting pallet 4 is in the posture for entering / leaving the vehicle, for example. Then, the hook 23
As a result, the arm 17 is restrained, and one end 28a of the swing member 28 projects into the displacement passage R of the tilt pallet 4 (see FIG. 8).

When the tilt pallet 4 is raised in this state, one end 28a of the rocking member 28 is rocked upward by the tilt pallet 4. In this case, if the connecting member 30 is not elastic, the swing member 28, the connecting member, the hook 23, and the like will be damaged. In order to prevent such a danger, the connecting member 30 is made expandable and contractible.

Next, the structure of the device for preventing the displacement body from falling according to the second embodiment will be described with reference to FIGS. 11 and 12. FIG. Note that the same or equivalent members or elements as those of the first embodiment are denoted by the same reference numerals as those described above, and redundant description will be omitted.

The fall prevention device according to the second embodiment includes a hook indicated by reference numeral 60.

The hook 60 is connected to the push rod 2
1 engages with the arm 17 retreated from the displacement passage R of the tilting pallet 4
Acts as a restraining member that restrains the tilted pallet 4 from the displacement passage R of the tilting pallet 4.

The hook 60 is located between the brackets 19 as in the case of the arm 17.
It is located above. The hook 60 is a hook support shaft 24 parallel to the arm support shaft 18, and is connected to the bracket 1.
9 is rotatably mounted at one end thereof.

The pivoting end 6 on the other end of the hook 60
A downward force is applied to 0a by its own weight or an appropriate spring. Since the downward force is blocked by the stopper 25, the hook 60 holds a predetermined arm restraining standby posture (the posture indicated by a solid line in FIG. 12). Here, the predetermined arm restraint standby posture means that when the arm 17 retreats from the displacement passage R of the tilt pallet 4,
A posture that can automatically engage with the arm 17. The illustrated hook 60 has an arc-shaped long hole 26 centered on the hook support shaft 23. A small shaft-shaped hook stopper 25 is inserted into the elongated hole 26, and the hook stopper 25 is fixed to the bracket 19.

The hook 60 has a claw 27 at a lower portion on the side of the rotating end 60a. When the arm 17 is forcibly retracted from the displacement passage R of the tilting pallet 4 by the operation of the push rod 21, the claw portion 27 is engaged with the engaged portion formed on the distal end portion 17 a side of the arm 17. It automatically engages with the portion 17f. For this reason, once the push rod 21 is pushed in by a predetermined amount to rotate the arm 17 upward, the arm 17 is held in a state of being retracted from the displacement passage R by the action of the hook 60.

Next, a mechanism for automatically releasing the engagement between the hook 60 and the arm 17 will be described.

A swing member 28 is provided below the arm 17. The swing member 28 is supported at the lower portion of the bracket 19. One end 28a of the swing member 28 is swingable up and down with its support shaft 29 as a center. In the normal state, one end of the swinging member 28 is located in the displacement passage R. However, the swinging member 28 swings up and down so that the one end 28a draws an arc centered on the support shaft 29 and is displaced. It is arranged so as to deviate from the passage R.

In the second embodiment, the swing member support shaft 2
Numerals 9 are located at portions other than both ends of the swing member 28. For this reason, the swing member 28 has one end 28a
And the other end 28b swing up and down around the support shaft 29. A downward force is applied to one end 28a of the swing member 28 by its own weight or an appropriate spring.

The other end 28b of the swing member 28 is connected to the pivoting end 60a of the hook 60 by a connecting member 30.
And operatively connected. When a downward external force acts on one end 28a of the swing member 28, the connecting member 30 transmits an upward force generated on the other end 28b side to the hook 60, and the connecting member 30 It functions to release the restraint of the arm 17.

In the illustrated example, the connecting member 30 is formed of an outer cylinder 31 and an inner cylinder 32 which are fitted in a stretchable manner. The upper end of the outer cylinder 31 is rotatably connected to a rotation end 60a of the hook 60 by an upper connection shaft 33, and the lower end of the inner cylinder 32 is connected to the other end 28b of the swing member 28 by a lower connection. It is rotatably connected by a shaft 34. The outer cylinder 31
Is provided with an inner cylinder stopper 35 which forms a receiving limit of the inner cylinder 32 in the upper part thereof. When the upper end of the inner cylinder 32 is in contact with the inner cylinder stopper 35, the connecting member 30 is in the shortest state.

Although the specific example of the inner cylinder stopper 35 may be any configuration, in the illustrated example, from the viewpoint of simplification of the configuration, the upper connecting shaft 33 is passed through the upper end of the outer cylinder 31 and A part of the upper connecting shaft 33 is used as the inner cylinder stopper 35.

The hook 60 is connected to the hook stopper 25
When a predetermined arm restraining standby posture is held, the connecting member 30 is in the shortest state, and at this time, the swinging member 28 is in a substantially horizontal state, and one end 28a is in the displacement passage R. positioned. The state shown by the solid line in FIG. 12 is the normal posture of the hook 60, the connecting member 30, and the swing member 28. This normal posture is maintained as long as no external force acts by the following configuration.

As shown in FIG. 13A, the moment of the downward force F4 acting on the upper connecting shaft 33 around the hook support shaft 24 is represented by M4. The moment of the downward force F5 acting on the one end 28a around the pivot member supporting shaft 29 is M5, and the moment of the upward force F6 acting on the lower connecting shaft 34 around the pivot member supporting shaft 29 is M6. Then, M5 = M6 is inevitable. Therefore, the magnitudes of the forces F4 and F5 and the arm lengths of the moments are set so that M4> M6 (= M5) is always satisfied.

As a result, the moment M5 (= M6)
Is transmitted to the hook 60 via the connecting member 30, but since the moment M4 acting on the hook 60 is larger, the hook 60 maintains the arm restraining standby posture unless an external force is applied. . At this time, the difference between the moment M4 and the moment M5 (= M6) is applied to the hook stopper 25, and the hook 60,
The normal posture of the connecting member 30 and the swing member 28 is maintained.

The operation of the fall prevention device according to the first embodiment configured as described above will be described with reference to FIGS. FIG. 13 shows a state in which the tilting pallet 4 in the vehicle storage position is displaced downward in the order of (a), (b), and (c). On the other hand, FIG.
(B) and (c) show the state when the tilting pallet 4 is displaced upward.

Referring to FIG. When the tilting pallet 4 is held in the posture at the time of storage in the vehicle, the arm 17 is stopped while protruding into the displacement passage R of the tilting pallet 4. Therefore, even in the event of an unexpected event such as the chain 8 being broken, the worst case is avoided because the arm 17 prevents the tilting pallet 4 from falling.

At this time, the hook 60, the connecting member 30, and the swinging member 28 are in the normal posture.

Referring to FIG. When the tilting pallet 4 is displaced downward to the vehicle loading / unloading posture in order to take out the vehicle C1 on the tilting pallet 4 or the like, the push rod 21 protruding outside the driving side support 7 is moved. The user pushes with his finger. Then, the distal end portion 21b of the push rod 21 causes the arm 1
7, the downward projecting portion 17d is pushed, and the tip portion 17a side of the arm 17 turns upward in an arc centered on the arm support shaft 18 and retreats from the displacement passage R of the tilting pallet 4.

At this time, the claw 27 of the hook 60 in the arm restraining standby posture is automatically engaged with the engaged portion 17f of the arm 17, and the arm 17 is retracted from the displacement passage R. To be restrained.

Then, if the user turns on the lowering operation switch SD and rotates the electric motor 9 in the unwinding direction of the chain 8, the tilting pallet 4 is displaced downward.

Referring to FIG. The tilting pallet 4 contacts one end 28a of the swinging member 28 after passing the arm 17 downward. One end 28a of the swing member 28 is pushed down by the tilt pallet 4 and swings downward to escape. At the same time, the other end 28b of the swing member 28 swings upward, and pushes the inner cylinder 32 upward through the lower connecting shaft 34. At this time, the inner cylinder 3
2 has an inner cylinder stopper 35 inside the outer cylinder 32.
, The outer cylinder 32 is also pushed up.
Then, the hook 60 is forcibly rotated upward through the upper connection shaft 33, and the claw portion 27 of the hook 60 is rotated.
And the engaged portion 17f of the arm 17 is disengaged. The arm 17 rotates and returns to the stopped state after projecting again into the displacement passage R of the tilting pallet 4.

When the tilting pallet 4 passes through the swinging member 28, the action of the external force on the swinging member 28 is stopped. Then, the hook 60 returns to the arm restraining standby posture again, and the connecting member 30 and the swinging member 28 also return to the normal posture.

Referring to FIGS. 14A and 14B. When the tilting pallet 4 is displaced upward, the tilting pallet 4
8 contacts one end 28a. One end 2 of the swing member 28
8a is pushed by the tilting pallet 4 and swings upward to escape. At the same time, the other end 28b of the swing member 28 swings downward, and pulls the inner cylinder 32 downward through the lower connecting shaft 34. At this time, there is no change in the vertical position of the outer cylinder 31, so that the hook 60 does not move.

When the tilting pallet 4 passes upward through the swinging member 28, the swinging member 28 is moved to its one end 28a.
The connection member 30 returns to the normal posture again due to its own weight or spring.

Referring to FIG. After the tilting pallet 4 has passed upward by the side of the swing member 28,
It contacts the inclined surface 17c of the arm 17. The tilting pallet 4 is rotated so as to rub the inclined surface 17c of the arm 17, and passes upward while allowing the arm 17 to escape from the displacement passage R.

When the tilt pallet 4 has passed upward, the arm 17 projects again into the displacement passage R and stops. The tilting pallet 4 stops in the vehicle retracted posture (see FIG. 13A).

When the arm 17 is released from the displacement passage R by the tilt pallet 4, it is not restrained by the hook 60. This is because the turning angle of the arm 17 is not so large as when the arm is forcibly turned by the operation of the push rod 21.

FIG. 15 shows a third embodiment which is a modification of the second embodiment. The same or equivalent members or elements as those of the second embodiment are denoted by the same reference numerals as those described above, and redundant description will be omitted.

The fall prevention device according to the third embodiment includes a hook denoted by reference numeral 40, a swinging member denoted by reference numeral 41, and a connecting member denoted by reference numeral. These configurations are different from those of the second embodiment.

The hook 40 has the same shape as the hook 60 in the second embodiment, and is arranged upside down, and is rotatably supported by the hook support shaft 24. The hook 40 is constantly urged upward by a tension spring 45 as an example of an urging means, and is stopped at a fixed position (arm restraining standby posture) by a hook stopper 46.

The swinging member 41 has one end 41a located in the displacement passage R of the tilting pallet 4 and is pivotally supported at the other end 41b. The swing member 4
1, a force F8 for rotating the one end 41a downward around the support shaft 47 is exerted by the own weight of the one end 41a or an appropriate spring.

The connecting member 42 is composed of an outer cylinder 43 and an inner cylinder 44 which are fitted to each other so as to be able to expand and contract. The upper end of the outer cylinder 43 is connected to an upper connecting shaft 48 by a rotating end 40 a of the hook 40.
Are connected rotatably. The lower end of the inner cylinder 44 is
A lower connecting shaft 49 is rotatably connected to a swinging portion of the swinging member 41. The outer cylinder 43 includes the inner cylinder 4
An inner cylinder stopper 50 that forms an extension limit of 4 is provided at a lower portion thereof. The inner cylinder stopper 50 is attached to the inner cylinder 4.
When the upper end of 4 is in contact, the connecting member 42 is in the longest state.

When the hook 40 holds a predetermined arm restraining standby posture by the tension spring 45 and the hook stopper 46, the connecting member 42 is in the longest state. Is in a substantially horizontal state, and one end 41a thereof is located in the displacement passage R. Such a state shown by a solid line in FIG.
The hook 40, the connecting member 42, and the swing member 4
1 is a normal posture. This normal posture is maintained as long as no external force acts by the following configuration.

Now, the moment around the hook support shaft 24 of the upward force F7 acting on the upper connecting shaft 48 by the action of the tension spring 45 is M7, and the swing member 41
Of the downward force F8 acting on the one end 41a of the pivot shaft 47 around the pivot member support shaft 47, and the lower connecting shaft 4
Assuming that the moment of the downward force F9 acting on 9 around the swing member support shaft 47 is M9, M8 = M9
It is. Therefore, the magnitudes of the forces F7 and F8 and the arm lengths of the moments are set so that M7> M9 (= M8) is always satisfied.

As a result, the moment M8 (= M9)
Is transmitted to the hook 40 via the connecting member 42, but since the moment M7 acting on the hook 40 is larger, the hook 40 holds the arm restraining standby posture unless an external force is applied. . At this time, a difference between the moment M7 and the moment M8 (= M9) is applied upward to the hook stopper 46, and the normal state of the hook 40, the connecting member 42, and the swing member 41 is maintained.

An operation unique to the third embodiment will be described.

When the tilting pallet 4 displaced downward contacts one end 41a of the rocking member 41, the rocking member 41 rocks downward. Thereby, the lower connecting shaft 4
9, the inner cylinder 44 is pulled down, and at the same time, the outer cylinder 43 is also pulled down by the action of the inner cylinder stopper 50. Then, the hook 40 is forcibly rotated downward through the upper connecting shaft 48, and the hook 40
Is released from the arm 17.

When the tilting pallet 4 displaced upward contacts one end 41a of the rocking member 41, the rocking member 41 rocks upward. Thereby, the lower connecting shaft 4
9, the inner cylinder 44 is pushed up.
There is no change in the vertical position of. Therefore, the hook 40 does not move.

The operation of the other members is the same as the operation of the second embodiment.

As described above, according to the displacement preventing devices according to the first to third embodiments, unlike the conventional device, electric means such as a solenoid is used as means for operating the arm 17. Absent. Therefore, the material cost can be reduced, and no special control circuit is required. Therefore, the production cost can be reduced without sacrificing the safety of the parking device at all.

In order to displace the tilting pallet 4 downward from the storage position, the push rod 21 must be operated. This means
Before displacing the tilting pallet 4 downward, the user is forced to confirm the safety under the tilting pallet 4. Therefore,
Higher safety.

The concept of the present invention is not limited to those of the first and second embodiments, and various other modifications are possible. In particular, the combination of the restraining members (60, 40), the connecting members (30, 42) and the swinging members (28, 41) can be modified, for example, as follows.

FIG. 16 shows a hook 40 of the third embodiment as the restraining member, a connecting member 42 comprising the outer cylinder 43 and the inner cylinder 44 of the third embodiment as the connecting member, and a second member as the rocking member. This is an example in which the swing members 28 according to the embodiment are combined (for simplicity of illustration, the arm 17
Etc. are omitted). In this embodiment, contrary to the second embodiment, when the tilt pallet 4 is displaced upward, the swing member 28 and the connecting member 42
Through this, the restraint of the arm 17 by the hook 40 is released. When the tilting pallet 4 is displaced downward, even if the swinging member 28 swings, the force is interrupted at the portion of the connecting member 42, so that the hook 40 does not move.

However, in the embodiment shown in FIG. 16, an appropriate elastic member 51 such as a spring for holding the swinging member 28 in a substantially horizontal normal posture is required.

FIG. 17 shows the hook 60 of the second embodiment as the restraining member, the connecting member 30 composed of the outer cylinder 31 and the inner cylinder 32 of the second embodiment as the connecting member, and the third member as the swinging member. This is an example in which the swing members 41 of the embodiment are combined (the arm 17 and the like are omitted for simplification of the drawing). In this embodiment as well, contrary to the second and third embodiments, when the tilting pallet 4 is displaced upward, the hook 60 is provided via the swinging member 41 and the connecting member 30. The constraint of the arm 17 is released. When the tilting pallet 4 is displaced downward, even if the swinging member 41 swings, the force is interrupted at the connecting member 30 and the hook 60
Is immovable.

In the embodiment shown in FIG.
Similar to the sixth embodiment, an appropriate elastic member 52 such as a spring for holding the swinging member 41 in a substantially horizontal normal posture is required.

The device for preventing the displacement body from falling according to the present invention can be applied not only to the tilting type parking device as described in the present embodiment but also to a type of parking device in which the pallet is moved up and down in a horizontal state. In addition, the present invention can be widely applied to a machine having a displacement body that is vertically displaced and is held at a predetermined height.

[0132]

According to the present invention, unlike the conventional one,
As a means for retracting the receiving member from the displacement passage at the time of the normal downward displacement operation of the displacement body, an electric component such as a solenoid is not used. Therefore, since the material cost is low and complicated control is not required, the manufacturing cost can be reduced.

Further, when the displacement body is displaced downward from the holding position at a predetermined height, the retracting operation member must be operated without fail. This leads to forcing the user to confirm the safety under the displacement body before displacing the displacement body downward. Therefore, safety is higher.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing a parking device as an example of an application target of the present invention.

FIG. 2 is a diagram showing the parking device of FIG. 1 from the direction of arrow A, and shows a tilting mechanism of a tilting pallet.

FIG. 3 is a schematic explanatory view showing a tilt drive mechanism of a tilt pallet of the parking device of FIG. 1;

FIG. 4 is a partially broken perspective view showing the entire configuration of the fall prevention device according to the first embodiment of the present invention.

FIG. 5 is a partially cutaway front view of FIG. 4;

FIG. 6 is a front view in which a part of FIG. 5 is omitted.

FIG. 7 is a front view showing the operation of the fall prevention device according to the first embodiment.

FIG. 8 is a front view showing the operation of the fall prevention device according to the first embodiment.

FIG. 9 is a front view illustrating the operation of the fall prevention device according to the first embodiment.

FIG. 10 is a front view showing the operation of the fall prevention device according to the first embodiment.

FIG. 11 is a partially cutaway perspective view showing the entire configuration of a fall prevention device according to a second embodiment of the present invention.

FIG. 12 is a partially cutaway front view of FIG. 11;

FIG. 13 is a schematic front view illustrating the operation of the fall prevention device according to the second embodiment.

FIG. 14 is a schematic front view showing the operation of the fall prevention device according to the second embodiment.

FIG. 15 is a partially cutaway front view showing the entire configuration and operation of a fall prevention device according to a third embodiment of the present invention.

FIG. 16 is a schematic view showing another embodiment.

FIG. 17 is a schematic view showing still another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 4 Displacement body 7 Fixed part 17 Receiving member 21 Evacuation operation member 23 Restriction member 28 Swing member 28a One end of swing member 30 Connecting member R Displacement passage

Claims (1)

(57) [Claims] An apparatus for preventing a displacement body (4), which is displaced up and down and held at a predetermined height, from dropping from its holding position, wherein a displacement passage (R) of said displacement body (4) is provided. ), A receiving member (17) rotatably provided on the fixed part (7) side slightly below the holding position of the displacement body (4) so as to protrude and stop.
A retreating operation member (21) for rotating the receiving member (17) to retreat from the displacement passage (R) of the displacement body (4); and a displacement passage (R) of the displacement body (4). A restraining member (23) which engages with the receiving member (17) retracted from the housing to restrain the receiving member (17) from being retracted from the displacement passage (R) of the displacement body (4); Swinging provided so as to be able to swing up and down on the fixed part (7) below the receiving member (17) such that one end (28a) enters and exits the displacement passage (R) of the displacement body (4). A member (28), the swing member (28) and the restraining member (23) are operatively connected, and one end (28a) of the swing member (28) is moved by the displacement operation of the displacement body (4). When swinging, the force is transmitted to the restraining member (23), (23)
And a connecting member (30) for releasing the restraint of the receiving member (17) due to the above.