JP2001227186A - Fall prevention device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fall prevention device which realizes positive prevention of fall of a pallet lifting body. SOLUTION: Each of the pallet lifting bodies 24, 25 is provided with a rocking member 59 and an engaging member 53 on both ends thereof. These members are connected by means of a linking member 54. Then, a fall preventive member 56 which abuts on the engaging member 53 when the pallet lifting bodies 24, 25 are moved upward and downward is provided. Further, a rotation restricting member 55 which restricts rotation of the rocking member 59 when the pallet lifting bodies 24, 25 assume an elevated position is provided. Still further, a spring 57 is arranged so as to always maintain the engaging member 53 in the horizontal state and to return to its original position only when rotated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pallet elevating body falling prevention apparatus applied to a multi-stage type multi-story parking facility having a pallet elevating body mounted on a vehicle and raised and lowered.

[0002]

[Problems to be solved by the prior art and the invention] (1)
Multi-level multi-story parking facility with pallet lift
Simply called "parking facilities." ) Is for mounting a vehicle on a pallet and moving it up and down. Therefore, a fall prevention device for a pallet elevating body is generally provided to ensure safety.
Various types of this fall prevention device have been conventionally provided, but there is a demand that the device must function reliably when the pallet elevating body falls down. In order to meet this demand, it is necessary to make the structure and mechanism of the fall prevention device as simple as possible, and to eliminate parts that may cause a failure or the like.

(2) As a conventional fall prevention device, there is the following (see Japanese Patent Application Laid-Open No. 7-189519).

FIG. 14 is a schematic view showing a mechanism of a conventional fall prevention device employed in a parking facility. Reference numerals 1, 2
Indicates a main pillar and a sub pillar of the parking facility, respectively. Reference numeral 3 denotes a pallet lifting body that is raised and lowered between the main pillar 1 and the sub pillar 2. In addition, the pallet elevating body 3 shown by the solid line shows the descending state, and the pallet elevating body 3 shown by the two-dot chain line shows the ascending state.

[0005] The pallet elevating body 3 is raised and lowered while maintaining a horizontal state by a chain driving mechanism 4 and a parallel mechanism 5 provided on the main column 1 side. Note that the parallel mechanism 5 is configured by hanging a balance chain 7 around sprockets 6 provided at both ends of the pallet elevating body 3 as shown in the figure. When it is raised and lowered by the drive mechanism 4,
The balance chain 7 keeps the posture of the pallet elevating body 3 horizontal.

(3) By the way, if the balance chain 7 is cut while the pallet elevating body 3 is being moved up and down, the end (left side in the figure) of the pallet elevating body 3 will fall. There is a need to. For this reason, conventionally, a fall prevention device 8 as shown in the figure is provided.

The fall prevention device 8 includes a first lever 9 and a second lever 10 attached to a rotating shaft of a sprocket 6, a connecting member 11 for connecting the first lever 9 and the second lever 10, and a first abutment attached to the main column 1. It has a member 12, a second contact member 13 attached to the sub-post 2, and a spring 14 that constantly biases the second lever 10 counterclockwise in the figure. Reference numeral 15 denotes a solenoid-type stopper attached to the main column 1. The stopper 15 prevents the pallet elevating body 3 from falling at the right end in the figure.

The first lever 9, the second lever 10, and the connecting member 11 are normally in a position shown by a solid line in FIG. When the chain drive mechanism 4 operates, the pallet hook 16 engages with the hook 17 fixed to the pallet elevating body 3 from below. As a result, the pallet lifting body 3 is raised while maintaining the horizontal position. When the pallet lifting body 3 rises to a predetermined position,
The contact member 12 comes into contact with the first lever 9, whereby the first lever 9 is rotated rightward in the drawing. At the same time as the second
The lever 10 is rotated rightward in the drawing at a position passing through the second contact member 13 against the urging force of the spring 14 via the connecting member 11. Thereby, the lower end of the second lever 10 protrudes toward the sub-post 2 (the position indicated by the two-dot chain line in the figure).

If the balance chain 7 breaks in this state, the left end of the pallet elevating body 3 falls. However, since the first lever 9 contacts the first contact member 12, the first lever 9 Is restricted from turning counterclockwise in the figure. Therefore, the second lever 10 cannot rotate, so that the second lever 10
The lower end of the lever 10 abuts on the second abutting member 13 and its downward movement (fall) is regulated.

(4) The conventional fall prevention device prevents the pallet 3 from falling by such a mechanism.

However, in such a conventional structure, the second lever 10 must be held in the position shown by the solid line in the figure at all times (that is, in a normal operation state in which the balance chain 7 is not cut or the like). Therefore, it is necessary that the spring 13 always applies a predetermined tensile force to the second lever 10. If the elastic force of the spring 13 is reduced due to deterioration of the spring 13 or the like, the second lever 10 is not held in a predetermined posture (the posture indicated by a solid line in FIG. 10 is the second contact member 13
This causes a trouble that the smooth lifting operation of the pallet lifting body 3 is hindered by the collision.

It is an object of the present invention to provide a new and improved fall prevention device which eliminates the elements causing such a failure as much as possible and realizes the reliable prevention of the pallet elevating body from falling. It is.

[0013]

Means for Solving the Problems (1) In order to achieve the above object, a fall prevention device according to the present application has a pallet lifting body mounted on a vehicle between a pair of base members arranged in parallel,
The present invention is applied to a multi-stage type multi-story parking facility in which one base member side of a pallet elevating body is moved up and down between a lowering position and an ascending position while the pallet elevating body is held horizontally via a pallet parallel mechanism. A pallet elevating body falling prevention device, comprising: a swing member rotatably provided at one end of a base member side of the pallet elevating body toward the pallet elevating body side and one base member side; An engaging member rotatably provided to the pallet elevating body side and the other base member side in conjunction with the swing member at the other base member side end, and the other base member at the ascending position. The pallet elevating body is fixed at a position corresponding to the pallet elevating body, and the pallet elevating body is moved up and down by the fall prevention member with which the engaging member abuts. A rotation restricting member that restricts the rotation of the swing member when the lifting member is at the raised position, and a direction in which the rotation displacement is restored by a predetermined urging force when the engagement member rotates. And a biasing means for rotationally biasing the engaging member.

According to this configuration, the following operation is performed in the normal operation state of the parking facility. First, one base member side end of the pallet elevating body (hereinafter referred to as "one end side end" as appropriate)
That. When) is raised, the pallet parallel mechanism operates to raise the pallet elevating body in a horizontal state. By the way, the engaging member provided at one end of the pallet lifting body is
When the pallet is rotated toward the pallet elevating body or one of the base members, the rotational displacement is restored by the urging means.
That is, the engaging member is in an intermediate position in which the engaging member does not normally rotate toward the pallet elevating body or the other base member. Therefore, when the pallet elevating body moves up and down, the engaging member and the swinging member move as follows.

When the pallet elevating body is lifted, the engaging member provided at the other end of the pallet elevating body on the side of the other base member (hereinafter, appropriately referred to as "the other end") serves as a fall prevention member. collide. At this time, even if the engaging member collides with the fall prevention member, the pallet lifting body is further raised, so that the engagement member is relatively pressed by the fall prevention member and rotated. That is, when the engagement member comes into contact with the fall prevention member, the engagement member rotates in a direction to avoid the contact state. The urging means is actuated for the first time by the rotation of the engagement member, and the engagement member is urged in a direction in which the rotational displacement is restored. Therefore, at the time when the engaging member rotates and passes through the fall prevention member, the urging means causes the engaging member to return to the original state (an intermediate position in which the engaging member does not rotate toward the pallet lifting body or the other base member). (State of posture). Then, in this state, the pallet lifting body is arranged at the lifting position.

When the one end of the pallet elevating body is lowered, the pallet parallel mechanism operates to lower the pallet elevating body in a horizontal state. The engaging member collides with the fall prevention member also during the lowering, but as described above, even when such collision occurs, the pallet elevating body is further lowered. It is relatively pressed by the fall prevention member and is rotated and displaced. Then, when the engagement member passes through the fall prevention member, the engagement member returns to the original state by the urging means.

As described above, the interference between the engaging member and the drop prevention member does not hinder the raising or lowering operation of the pallet lifting body.

On the other hand, when a problem occurs in the pallet parallel mechanism when the pallet elevating body is in the ascending position and the other end of the pallet elevating body falls, the following operation is achieved. First, the ascending position of the pallet elevating body can be defined as a predetermined position at which the pallet elevating body must be prevented from falling, and can be set to a required position as appropriate in the hoistway of the pallet elevating body. It is possible.

When the other end of the pallet elevating body falls, the engaging member collides with the fall prevention member, and as described above, the engaging member tries to rotate to avoid this contact state. The swinging member tries to rotate in conjunction with the engaging member. However, at this time, since the rotation restricting member restricts the rotation of the rocking member, the rocking member cannot rotate. As a result, the rotation of the engagement member is restricted, and the engagement member is held in a state of contact with the fall prevention member.
The pallet lifting body is prevented from falling at the other end.

(2) Further, in the fall prevention device according to the present application, the urging means is constituted by a tension coil spring, and the tension coil spring is configured such that the engaging member is on the pallet elevating body side and on one base member side. And the pallet elevating body is connected to the engaging member and the pallet elevating body in a state where no tensile force is applied so that the engaging member does not receive a rotating torque in a state in which the engaging member is in a middle position between the engaging member and the pallet elevating body. Things.

According to this structure, since the urging means is constituted by a coil spring, the structure is extremely simple. In addition, since the coil spring is normally connected in a state where no tensile force acts between the engaging member and the pallet elevating body, normally, the tension coil spring is not displaced.

[0022]

Embodiments of the present invention will be described below.

FIG. 1 is a front view showing a configuration of a parking facility 20 according to one embodiment of the present invention. FIG. 2 is a diagram schematically illustrating a drive system of the parking facility 20.

(1) Schematic Configuration and Points of the Present Embodiment The schematic configuration of the parking facility 20 will be described with reference to FIG. 1 and FIG.

The parking facility 20 is a two-stage type multi-story parking facility, and is installed in a pit 22 formed below a floor surface 21. The floor surface 21 forms a vehicle entry surface for a vehicle to enter, and the vehicle can enter in a direction perpendicular to the paper surface.

This parking facility 20 is provided with two pallet lifting bodies 24 and 25. Each pallet lifting body 24, 2
5 is provided with two pallets for vehicle mounting (hereinafter, simply referred to as "pallets") 26 and 27, respectively, and the vehicle is put on the pallets 26 and 27 and is raised and lowered. I have. Each pallet lifting body 24, 2
5 is a main pillar 28 (one base member) erected at the center of the pit 22 and a sub pillar 29 erected at an end of the pit 22.
(The other base member) to ascend and descend along these.

The lifting operation of the pallet lifting members 24 and 25 is as follows.
This is performed by a lifting drive device 30 described later, and a parallel mechanism 3 described later is used to raise and lower these while maintaining a horizontal state.
1 (pallet parallel mechanism) is provided. Further, the pallet lift 2 and the pallet lift 2
As a safety device for reliably preventing the fall of the 4, 25, a fall prevention device 32 (not shown in FIGS. 1 and 2) described later is provided. The main column 28 is provided with a lock device (not shown in FIGS. 1 and 2) as another safety device for preventing the pallet elevating bodies 24 and 25 from falling.

A safety fence 23 is provided around the pit 22. Reference numeral 33 denotes an operation panel for operating the parking facility 20. By operating the operation panel 33, the operation of lifting and lowering the pallet lifting bodies 24 and 25 can be controlled.

The feature of the parking equipment 20 according to the present embodiment lies in the structure of the fall prevention device 32, and the occurrence of a failure can be minimized with a very simple structure. It is. Below, parking facilities 2
0 will be described in detail.

(2) Pallet Lifting Body The pallet lifting body 24 has the upper and lower pallets 26 and a support frame 34 for supporting the pallets 26.

Each pallet 26 has a pallet receiving beam 35 at the bottom thereof, and a pair of pallet receiving beams 35 are provided in the front-rear direction of the pallet 26 (the direction perpendicular to the plane of FIG. 1). Main pillar 28 of this pallet receiving beam 35
At the end on the side, a locking plate 49 is provided. The locking plate 49 is adapted to engage with the lifting / lowering drive device 30, and the pallet lifting / lowering body 24 moves up and down when the lifting / lowering drive device 30 operates.

Also, four support frames 34 are provided in the front, rear, left and right directions (see FIG. 2), whereby the upper and lower pallets 26 are integrated with the pallet receiving beam 35 and the support frame 34. The pallet lifter 25 has the same configuration.

(3) Elevating Driving Device Next, the elevating driving device 30 will be described.

Referring to FIG. 2, the lifting drive device 30 includes a drive motor 37, a main shaft 38 driven by the drive motor 37,
And a chain drive mechanism 39 connected to the main shaft 38. Here, FIG. 3 illustrates the raising / lowering operation of the pallet lifting bodies 24, 25. FIG. 4 is a cross-sectional view taken along line A- in FIG. 3 and shows a state where the main shaft 28 supports the main shaft 38. FIG. 5 is a cross-sectional view taken along the line B in FIG. 3 and shows a main part of the chain drive mechanism 39.

First, referring to FIG.
Is fixed to the main column 28 via a predetermined bracket (not shown). The drive shaft of the drive motor 37 is provided with a sprocket 40, and the main shaft 38 is provided with a corresponding sprocket 41. And a chain 42 is hung on these sprockets 40 and 41,
When the drive motor 37 is driven, the main shaft 38 is driven to rotate.

The main shaft 38 is supported by the main column 28 as shown in FIG. The main pillar 28 is provided as a pair facing the pit 22 in the front-rear direction. As shown in FIG.
No. 8 is configured by arranging a pair of C-shaped steels 43 with their openings facing each other (only one end is shown in FIG. 4). Then, both ends of the main shaft 38 are supported by the pair of main columns 28 in a state of penetrating the C-shaped steel 43. Reference numeral 44 indicates a sprocket of the chain drive mechanism 39.

Referring to FIGS. 2 and 3, chain drive mechanism 39 includes sprockets 44 provided at both ends of main shaft 38 and sprockets 45 provided rotatably below both main columns 28, respectively. And a drive chain 46 hung on the sprockets 44 and 45, and a locking piece 47 (see FIG. 3) provided on a part of the drive chain 46.

A pair of sprockets 44 and 45 are provided. In addition, the sprocket 44 and the corresponding sprocket 45 are vertically opposed in the figure. In addition, as shown in FIG.
It is fixed so as to bridge over a pair of drive chains 46. This fixing is performed by connecting the pin 48 to the pair of drive chains 4.
6 and the pin 48 supports the locking piece 47.

Therefore, when the drive motor 37 is driven, the main shaft 38 rotates and the drive chain 46 is fed along the rotation direction (see FIG. 2). As a result, the locking piece 47 is moved upward or downward to engage with the locking plate 49. As a result, the pallet lifting members 24 and 25 are raised and lowered, and as shown in FIG.
) And the lowering position (the position of the pallet lifter 25).

(4) Parallel mechanism Referring to FIG. 3, the parallel mechanism 31 includes a pallet lift 2
This is for raising and lowering the 4, 4 while keeping it horizontal. The parallel mechanism 31 has guide sprockets 36 provided on each pallet receiving beam 35, a balance chain 50 wrapped around these, and anchors 51, 52 for fixing both ends of the balance chain 50.

As shown in FIG. 2, the guide sprocket 36 is rotatably supported on the left and right ends of each pallet receiving beam 35 via a rotation center shaft 58. The anchor 51 is shown in FIG.
The anchor 52 is fixed to the bottom of the pit 22 as shown in FIG.
Is fixed to the upper end of the sub pillar 29. As shown in the figure, the balance chain 50 has one end fixed to the anchor 51 and the other end fixed to the anchor 52 as shown in the drawing. The balance chain 50 is connected to the guide sprocket 36 on the right side in the drawing from one end.
And the left guide sprocket 3
6 and is fixed to the anchor 52 at the other end.

Therefore, when the locking piece 47 is raised and engaged with the locking plate 49, the pallet lifting body 24
Of the main column 28 (right side in FIG. 3) is raised. At this time, since both ends of the balance chain 50 are fixed, the balance chain 50 is pulled by raising the right guide sprocket 36. As a result, the left side of the pallet elevating body 24 is lifted upward, and as a result, the pallet elevating body 24 is kept horizontal. The same applies to the pallet lifting body 25.

(5) Fall Prevention Device The fall prevention device 32 is for preventing the pallet elevating bodies 24 and 25 from falling when the balance chain 50 is cut. FIG. 6 shows a configuration of the fall prevention device 32. In order to simplify the explanation, FIG.
Although only the prevention of the fall of the pallet elevating body 24 is shown in the figure, the same applies to the pallet elevating body 25.

Referring to FIG. 5, a fall prevention device 32 includes a swinging member 59 provided at an end portion on the right side (main column 28 side) of pallet elevating body 24 and a left side of pallet elevating body 24 (sub column 2).
9) an engagement member 53 provided at the end, a coupling member 54 for interlocking the swing member 59 and the engagement member 53, a rotation regulating member 55 fixed to a predetermined position of the main column 28, A fall prevention member 56 fixed to a predetermined position of the sub-pillar 29 and a tension coil spring (hereinafter, referred to as “spring”) 57 (biasing means) for holding the engagement member 53 in a fixed posture are provided. are doing.

The swing member 59 is formed of a flat plate-like member and is formed in a substantially trapezoidal shape. The oscillating member 59 is rotatable about the rotation center shaft 58 while the pallet receiving beam 3
5 is supported. That is, the swing member 59 is provided coaxially with the guide sprocket 36 (right side) of the parallel mechanism 31. The connecting member 54 is located below the swing member 59.
Constitute a mounting portion 64 for mounting.

The engagement member 53 is formed of a flat plate-like member, and is rotatably supported by a rotation center shaft 58 of the guide sprocket 36. The engaging member 53 is provided concentrically with the guide sprocket 36 (left side) similarly to the swing member 59.

The engaging member 53 is moved from the center of rotation to the
9, a contact escape portion 61 that is curved downward from the engagement claw portion 60 and is notched, and a spring that protrudes from the rotation center toward the main column 28. Mounting part 62
And The lower end of the contact escape portion 61 constitutes a mounting portion 65 for mounting the connecting member 54. Further, the spring mounting portion 62 is a portion to which one end of the spring 57 is mounted, and for this purpose, a small hole 63 is provided. The functions of the engagement claw portion 60 and the contact escape portion 61 will be described later.

The connecting member 54 is constituted by an elongated flat plate member. Both ends of the connecting member 54 are
And the mounting portion 65 of the engaging member 53 are connected to the mounting portion 64. This connecting structure uses a connecting pin 66, and the swing member 59, the engaging member 53, and the connecting member 54 are in a rotatable state. Therefore, when one of the swinging member 59 and the engaging member 53 rotates, the two members rotate in the same direction by the connecting member 54. Specifically, as shown in FIGS. 9 to 13, the swinging member 59 and the engaging member 53 rotate, and this point will be described in detail later.

The rotation regulating member 55 is made of a block-shaped steel material. This rotation restricting member 55 is
The pallet lifting member 24 of the pallet elevating body 24 at the ascending position is attached to the predetermined position.
Is a position corresponding to the position of. This rotation restricting member 55
Protrudes from the main column 28 toward the pallet elevating body 24, and is arranged so as to be close to the swinging member 59 when the pallet elevating body 24 is at the ascending position. Therefore, when the pallet lifter 24 is in the raised position, even if the swinging member 59 tries to rotate clockwise in the drawing, the swinging member 59 comes into contact with the rotation regulating member 55, so that the swinging member 59 is rotated.
Is restricted. On the other hand, even when the pallet elevating body 24 is at an arbitrary position other than the ascending position, the swing member 59 is set so as not to come into contact with the rotation restricting member 55 even if it rotates counterclockwise in the drawing. ing.

The fall prevention member 56 can be made of a steel material and is fixed to the sub-post 29. The position at which the fall prevention member 56 is fixed is the position of the engagement claw 6 of the engagement member 53 when the pallet lifting body 24 is at the raised position.
It is just below 0.

One end of the spring 57 is connected to the engaging member 53.
And the other end of the pallet support 35
It is connected to. As shown in FIG. 6, the spring 57 is always in a horizontal state, and is arranged so that no tensile force acts (without extension of the spring 57). For this reason,
When the engaging member 53 rotates clockwise or counterclockwise from the state shown in FIG. 6, the spring 57 is pulled only by this pulling force.
To return to the state. That is, the engagement member 53 is always kept in a fixed posture shown in FIG. (6) Locking device The locking device is mounted on the main pillar 28 as described above, and the fall prevention device 32 operates when the balance chain 50 is cut off. This is for surely preventing the pallet elevating bodies 24 and 25 from falling even when the pallet is cut (see FIGS. 1 and 2).

The locking device is designated by the reference numeral 70 in FIG.
Indicated by 7 is a sectional view taken along a line C- in FIG. 6, and FIG. 8 is a view taken along a line D- in FIG. 7.

Referring to FIG. 7 and FIG.
Numeral 0 includes a solenoid main body 72 and a stopper 71 which is moved right and left in the figure by this.

The stopper 71 is a U-shaped member as shown in the figure, and can be made of, for example, a steel material. The stopper 71 is accommodated in the C-shaped steel 43 of the main column 28, and can be displaced between an accommodation posture shown by a solid line and a lock posture shown by a two-dot chain line. The lock posture is a posture that protrudes from the C-shaped steel 43 toward the center of the main column 28 (the direction indicated by the white arrow 73 in FIG. 8), and by displacing this posture, the arrow 74 in FIG. Pallet elevating body 24, 2 that moves up and down along the direction
5 is brought into contact with the locking plate 49.

The lock device 70 is installed such that the stopper 71 is at the position shown in FIG. That is, when the pallet elevating bodies 24 and 25 are at the ascending position, the stoppers 71 are installed so as to be located immediately below the lower surface of the locking plate 49.

The parking facility 20 is provided with a control device (not shown) for controlling the operation of the lock device 70. When the pallet lifting members 24 and 25 are at the raised position, the stopper 71 is moved. The stopper 71 is displaced from the locked posture to the accommodated posture immediately before moving from the raised position to the lowered position. (7) Operation and Effect of Parking Facility Next, the operation of the parking facility 20 will be described together with the operation and effect of each unit.

First, the following operation is performed in a normal operation state. The drive motor 37 of the lifting drive device 30 shown in FIG.
Operates, the main shaft 38 rotates, and the chain drive mechanism 3
The locking piece 47 (see FIG. 3) moves via 9. When attention is paid to the pallet elevating body 24 for simplicity of description, the locking piece 47 is raised and engages with the locking plate 49 of the pallet elevating body 24. Thereby, the main column 28 of the pallet elevating body 24 is
The side end (right side) is lifted, but the pallet lifting body 24 is raised by the parallel mechanism 31 while maintaining the horizontal position.

Referring to FIG. 6, when the pallet elevating body 24 is raised, the engaging member 53 and the fall prevention member 56 come into contact with each other. However, the contact state of the engagement member 53 with the fall prevention member 56 is avoided as follows, and the pallet lifting body 24 is allowed to move up. 9 to 1
1 shows the movement of the fall prevention device 32 when the pallet lifting body 24 moves up in order. 11 to 13 show the movement of the fall prevention device 32 when the pallet lifting body 24 descends in order. In these figures, the spring 57 is not shown.

As shown in FIG. 9, when the pallet elevating body 24 rises, the slope of the engaging claw portion 60 of the engaging member 53 comes into contact with the fall prevention member 56. Is further raised, the engaging member 53 is relatively pressed by the drop prevention member 53, and rotates in a direction (counterclockwise in the drawing) to avoid the contact state (FIG. 10).
reference). Accordingly, the swing member 59 is also rotated by the connecting member 54 in the same direction as the engaging member 53, and the spring 5
7 (not shown) is pulled for the first time,
An urging force is applied in a direction in which the rotational displacement is restored.
When the engaging member 53 rotated so as to avoid the contact state with the fall prevention member 56 passes through the fall prevention member 56, at this time, the engagement member 53 is returned by the urging force of the spring 57. And the rocking member 59 returns to the original state (see FIG. 11). Then, at this time, the pallet elevating body 24 is arranged at the ascending position (see FIG. 6). At this point, the swinging member 59 is disposed close to the rotation regulating member 55, but does not come into contact with each other. Further, in this state, the swinging member 59 is in a state in which it can rotate counterclockwise, and in the state in which clockwise rotation can be prevented by the rotation restricting member 55. On the other hand, the same applies when the pallet lifter 24 at the raised position is lowered. Pallet lift 2 from the position shown in FIG.
As the pallet lifting member 24 is further lowered, the engaging member 53 is relatively pressed by the drop preventing member 53 when the pallet elevating body 24 is further lowered. Then, it rotates in a direction (clockwise in the figure) to avoid the contact state (see FIG. 12). Thus, the swing member 59 is also connected to the engaging member 53 by the connecting member 54.
And the spring 57 is pulled for the first time, and the engaging member 53 is applied with a biasing force in a direction in which the rotational displacement is restored. Then, when the engaging member 53 passes through the fall prevention member 56, at that time, the engaging member 53 returns to the original state by the urging force of the spring 57, and the rocking member 59 returns to the original state. (See FIG. 13). Then, at this time, the pallet elevating body 24 is arranged at the lowered position (see FIG. 6). in this way,
The interference between the engaging member 53 and the fall prevention member 56 does not hinder the raising or lowering operation of the pallet lifting body 24 at all.

Next, when the balance chain 50 is cut when the pallet lifter 24 is at the raised position, the fall prevention device 32 has the following operational effects.

FIG. 11 shows a state in which the pallet elevating body 24 is in the ascending position. When the balance chain 50 is cut off at this time, the end of the pallet elevating body 24 on the side of the sub column 29 falls, The engagement member 60 collides with the fall prevention member 56. At this time, as described above, the engagement member 60
At this time, the swinging member 59 tries to rotate in conjunction with the engaging member 60 while avoiding the contact state. However, at this time, since the rotation restricting member 55 provided on the main pillar 28 contacts the rocking member 59 to restrict the rotation, the rocking member 59 cannot rotate. That is, the rotation of the engagement member 60 is restricted, and the engagement member 60
Is held in contact with the fall prevention member 56. As a result, the pallet lifting body 24 is prevented from falling.

As described above, according to the fall prevention device 32 according to the present embodiment, even when the balance chain 50 is cut, the engagement member 60 and the fall prevention member 56 are brought into contact with each other. The pallet elevating body 24 is prevented from dropping, and the swing member 59, the rotation restricting member 55, the spring 57 and the Accordingly, the relative displacement between the engagement member 60 and the fall prevention member 56 is allowed, and the pallet lifting body 24 is smoothly lifted and lowered. In addition, at the time of standby, the required mechanical elements are not operated to maintain the standby state as in the case of the conventional fall prevention device.
Since the engagement member 60 is merely rotated so as to avoid the contact state for the first time when the fall prevention member 56 comes into contact with the zero prevention member 56, the mechanical elements of the fall prevention device 32 The possibility of deterioration is extremely low.

That is, the fall prevention device 32 according to the present embodiment has a very simple structure, and can eliminate the inconvenience that a failure occurs during standby in preparation for an accident. Lifting body 24
Can be reliably prevented over a long period of time.

In particular, in the present embodiment, the spring 57 is employed as the urging means, and is installed in a state where the initial displacement of the spring 57 is eliminated so that the engaging member 60 does not receive the rotating torque at all times. I have. Thereby, it is possible to more effectively eliminate the occurrence of failure of the fall prevention device 32 due to the deterioration of the spring 57.

In the present embodiment, the pallet lift 2
Although the position shown in FIG. 1 has been described as the ascending position of 4, the position ascended even slightly from the descending position can be defined as the ascending position. In this case, there are a plurality of raised positions, but a fall prevention member 56 and a rotation restricting member 55 can be provided corresponding to each raised position. In addition, the above description is the same for the pallet elevating body 25, and thus the description of the pallet elevating body 25 is omitted.

[0066]

As described above, according to the present invention, the fall prevention device realizes the prevention of the fall of the pallet elevating body by bringing the engaging member and the fall prevention member into contact with each other, and always shakes the pallet. The moving member, the rotation restricting member, and the biasing means allow a relative displacement between the engaging member and the fall prevention member to realize a smooth lifting and lowering of the pallet lifting body.

In addition, during normal operation, that is, during standby of the fall prevention device in preparation for the accident of falling of the pallet elevating body, required machine elements are operated to maintain the standby state like a conventional fall prevention device. is not. That is, when the engaging member and the fall prevention member come into contact with each other when the pallet elevating body is moved up and down, the engaging member is only once rotated so as to avoid the contacting state, and the members and the elements are in the standby state. Is not always activated.

Therefore, the fall prevention device according to the present invention has a very simple structure, and can eliminate the inconvenience that the mechanical elements are degraded at the time of standby in preparation for an accident. The pallet can be reliably prevented from falling over a long period of time.

[Brief description of the drawings]

FIG. 1 is a front view showing a configuration of a parking facility according to an embodiment of the present invention.

FIG. 2 is a diagram schematically showing a drive system of a parking facility according to one embodiment of the present invention.

FIG. 3 is a view showing a lifting operation of a pallet lifting body according to one embodiment of the present invention.

FIG. 4 is a sectional view taken along the line A in FIG. 3;

FIG. 5 is a sectional view taken along line B in FIG.

FIG. 6 is a diagram showing a configuration of a fall prevention device according to an embodiment of the present invention.

7 is a sectional view taken along the arrow C-part of FIG.

FIG. 8 is a view taken in the direction of arrow D in FIG. 7;

FIG. 9 is a view showing a part of the movement of the fall prevention device when the pallet lift is raised.

FIG. 10 is a view showing a part of the movement of the fall prevention device when the pallet lift is raised.

FIG. 11 is a view showing a part of the movement of the fall prevention device when the pallet lift is raised.

FIG. 12 is a view showing a part of the movement of the fall prevention device when the pallet elevating body descends.

FIG. 13 is a view showing a part of the movement of the fall prevention device when the pallet elevating body descends.

FIG. 14 is a schematic view showing a mechanism of a conventional fall prevention device.

[Explanation of symbols]

 Reference Signs List 20 parking equipment 24 pallet elevating body 25 pallet elevating body 26 pallet 27 pallet 28 main column (one base member) 29 sub column (the other base member) 30 lifting drive device 31 parallel mechanism (pallet parallel mechanism) 32 fall prevention device 39 Chain drive mechanism 49 Locking plate 50 Balance chain 53 Engaging member 54 Connecting member 55 Rotation restricting member 56 Fall prevention member 57 Spring (biasing means) 59 Swinging member 60 Engaging claw portion 61 Contact escape portion

Claims (2)

[Claims] A pallet elevating body for mounting on a vehicle is arranged between a pair of base members arranged side by side, and one of the base member sides of the pallet elevating body is moved up and down so that the pallet elevating body is moved via a pallet parallel mechanism. A fall prevention device for a pallet elevating body applied to a multi-level multi-story parking facility for raising and lowering between a lowering position and an ascending position while being held horizontally, wherein the pallet elevating body has one base member side end, A swing member rotatably provided to the pallet elevating body side and one base member side; and a pallet elevating body side and the other base at an end of the other base member side of the pallet elevating body in conjunction with the swing member. An engaging member rotatably provided to the member side and a position of the other base member corresponding to the pallet elevating body at the ascending position are fixed, and the pallet elevating body moves up and down. A fall prevention member against which the engaging member abuts, a rotation restricting member fixed to one base member, and restricting the rotation of the swinging member when the pallet elevating body is at the raised position; And a biasing means for rotating and biasing the engaging member in a direction for restoring the rotational displacement with a predetermined biasing force when the engaging member rotates. . 2. The fall prevention device according to claim 1, wherein the urging means is constituted by a tension coil spring, and the tension coil spring is configured such that the engagement member has a pallet lifting body side and one base member side. And the pallet elevating body is connected to the engaging member and the pallet elevating body in a state where no tensile force is applied so that the engaging member does not receive a rotating torque in a state in which the engaging member is in a middle position between the engaging member and the pallet elevating body. Fall prevention device.