JPH0711798A - Pallet holding device - Google Patents

Abstract

PURPOSE:To prevent a bending moment by a vehicle placed on a pallet from being applied to an endless chain, and also increase a pallet holding accuracy for each position. CONSTITUTION:A pallet holding device is provided with a pair of attachments 15 installed rotatably on a pair of endless chains 3. Also a recessed part 23 is installed in the upper surface of the attachments 15. A protruded part 25 is provided at a leg part 17 of a pallet 9 so that it faces the recessed part 23 in vertical direction. The protruded part 25 is detachably fitted closely to the recessed part 23 so that the pallet 9 and attachments 15 are integral with each other as a beam. The recessed part 23 is so formed that it is expanded from its bottom surface toward opening. Then the protruded part 25 is so formed that it is contracted from its base part to top end according to the shape of the recessed part 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pallet holding device, and more particularly to a pallet holding device for holding a pallet on a hanging member such as a chain or rope for vertically moving a pallet on which a vehicle is placed.

[0002]

2. Description of the Related Art Conventionally, for example, in a multilevel parking facility,
An elevating device is provided for transferring a pallet on which a vehicle is placed between a loading / unloading room having different heights and a parking portion. The lifting device is provided with a pair of endless chains that are wound around a pair of sprockets vertically spaced apart from each other at predetermined intervals and that cyclically move in a vertical plane. It is known to lift a pallet by supporting a pallet provided between endless chains.

The elevator device is usually provided with a pallet holding device for holding a pallet on each of the pair of endless chains. As shown in FIG.
The pallet holding device 101 includes an attachment 105 provided on an endless chain 103 so as to project outward, and a pallet is attached to an upper surface of the attachment 105 projecting horizontally in a vertically moving portion of the endless chain 103. 107 is placed and supported and transferred, and after the transfer is completed, the pallet 107 is delivered to the loading / unloading room or the parking section.

The attachment 105 includes a pallet 10
7 is provided with a guide pin 111 which is inserted into an engagement hole 109 provided on the lower surface of the pallet 7, and the pallet 107 is positioned by the engagement hole 109 and the guide pin 111.
This ensures the predetermined pallet 107 holding accuracy. The endless chain 103 is a pair of left and right brim members 11
It is provided in a guide rail 115 having 3, 113, and a pair of upper and lower rollers 117, 117 provided in the attachment 105 run along the guide rail 115.

[0005]

As shown in FIG. 8, in the pallet holding device 101, the pallet 107 is used.
Are simply placed and supported by the attachments 105 on both sides of the pallet 107 and the pallet 107 as separate bodies.
It receives a bending action due to the load of the vehicle above. One end of the attachment 105 is supported by the endless chain 103, while the other end receives the load of the vehicle via the pallet 107. A bending moment acts on one end of the attachment 105, and the pair of rollers 117 is rotated clockwise by the bending moment to press the brim members 113 on the left and right sides of the guide rail 115, respectively. On the guide rail 115, reaction forces r and r are generated against the pressing force due to this bending moment. Therefore, the guide rail 115 needs to support not only the vertical movement of the attachment 105 but also the attachment 105 from both the left and right sides, and must have a sturdy structure that can withstand the force received by the pair of rollers 117. There was a problem.

In addition, the positioning by the engagement hole 109 and the guide pin 111 has a problem that the pallet 107 cannot be accurately positioned because the holding accuracy of the pallet 107 is low.

The present invention has been made in view of the above point, and prevents a bending moment of a vehicle placed on a pallet from acting on a hanging member (endless chain) and holds the pallet at each location. The purpose is to improve accuracy.

[0008]

In order to achieve the above object, the present invention provides a concave portion on one of the lower surface of the pallet and the upper surface of the attachment, and a convex portion on the other, and the concave portion and the convex portion are provided. The pallet and the attachment are detachably fitted so as to be integrated like a beam.

[0009] Specifically, the solving means devised by the invention according to claim 1 is a pair of vertically movable hanging members provided at predetermined intervals so as to extend in the vertical direction, and the pair of hanging members. And a pallet to put the vehicle between
One of a pair of attachments projecting toward the pallet from each of the pair of hanging members and rotatably provided with respect to the pair of hanging members, and one of a lower surface of the pallet and an upper surface of the pair of attachments. Is provided on the other side of the lower surface of the pallet and the upper surface of the pair of attachments so as to face the recessed portion in the vertical direction so that the pallet and the attachment are integrated like a beam. And a convex portion that is detachably fitted in the concave portion.

Further, a solution means taken by the invention according to claim 2 is the pallet holding device according to claim 1, wherein the recess is formed so that the recess expands from the bottom surface toward the opening. The convex portion is formed so that the convex portion becomes thinner as it goes from the base portion to the tip end in accordance with the shape of the concave portion.

[0011]

With the above construction, in the invention according to claim 1,
One of the lower surface of the pallet and the upper surface of the attachment is provided with a concave portion and the other is provided with a convex portion, and by fitting the concave portion and the convex portion, the pallet and the attachment are integrated like a beam. Moreover, since each attachment is rotatably supported by the hanging member, the pallet and each attachment function as if they were both support beams whose both ends can freely rotate. Therefore, the bending moment due to the load of the vehicle does not act on the support points of the attachments, which correspond to both ends of the beam.

Further, since the positioning by the concave-convex fitting is more accurate than the positioning by the conventional engagement hole and the guide pin, the pallet holding accuracy per location is improved.

Further, in the invention according to claim 2, the concave portion is formed so that the concave portion expands from the bottom surface to the opening, while the convex portion corresponds to the shape of the concave portion and the base portion. Since it is formed so as to become thinner from the end to the tip, it is easy to attach and detach the protrusion to the recess.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an elevating device to which a pallet holding device according to an embodiment of the present invention is applied, FIG. 2 is an enlarged view of a main part near the pallet holding device in the elevating device, and FIG. 3 is a plan view of FIG. The figure is shown. As shown in FIGS. 1 to 3, the lifting device 1 includes endless chains 3 and 3 as left and right two rows of hanging members, one pair each on the left and right, at predetermined intervals. Each of the pair of front and rear endless chains 3 is wound around a pair of sprockets 5, 5, ... A pallet 9 on which a vehicle 7 is placed is provided between a pair of endless chains 3 arranged in two rows in the front and rear.

A pallet 9 is attached to the front and rear 2 of the lifting device 1.
A pallet holding device 11 for holding a pair of endless chains 3 in a row is provided. The pallet holding device 11 is
Each endless chain 3 projects outward and has a connecting pin 13a,
A plurality of attachments 15, 15, ... Are provided so as to be rotatable with respect to each endless chain 3 by 13b. Each of the pair of attachments 15 projects toward the pallet 9 at a vertically moving portion of the endless chain 3 that extends in the up-down direction. The leg portions 17 of the respective are mounted. The elevating device 1 is configured to vertically hold the pallet 9 by vertically moving the vertically moving portion of the endless chain 3.

As shown in FIGS. 4 and 5, the bases of the attachments 15 are provided with two pairs of upper and lower rows of rollers 19 and 19 pivotally supported by connecting pins 13a and 13b, respectively. The pair of rollers 19 are guided by guide rails 21 extending in the vertical direction along the endless chain 3 to travel. Attachment 1
A concave portion 23 is provided on the upper surface of the front end portion of the member 5 between the front and rear ends.

Further, the pallet holding device 11 is provided with a convex portion 25 provided on the leg portion 17 of the pallet 9 so as to face the concave portion 23 in the vertical direction. The convex portion 25 is
The pallet 9 and the attachment 15 are detachably fitted into the recess 23 so as to be integrated like a beam.

Further, the recess 23 of the attachment 15 has a recess-side vertical surface 27 formed on the left side surface of FIG.
The recessed-side inclined surface 2 formed on the right side surface of FIG.
9 and are provided.

On the other hand, in the convex portion 25, the convex portion-side vertical surface 3 which is formed on the left side surface of FIG. 4 and contacts the concave portion-side vertical surface 27.
1 and the concave-side inclined surface 29 formed on the right side surface of FIG.
And a convex-side inclined surface 33 that is in contact with the concave-side inclined surface 29 and that is formed with the same inclination angle θ as the above. ing.

Next, the function of holding the pallet 9 on which the vehicle 7 is placed in the pallet holding device 11 will be described. A pair of attachments 15 of the pallet holding device 11
When the pallet 9 and the pallet 9 are brought close to each other, the concave portions 23 of the pair of attachments 15 in the front and rear rows and the four convex portions 2 of the pallet 9
5 and 5 fit together, and pallet 9 and attachment 1
5 is integrated like a beam. Furthermore, the endless chain 3
Each of the attachments 15 suspended in the end is rotatable around the upper connecting pin 13a, and the endless chain 3
Since the portion of the lower side of the attachment 15 is loosened and does not hinder the rotation of the attachment 15, the attachment 15 can freely rotate with respect to the endless chain 3. Therefore, the pallet 9 and the attachments 15 are, so to speak, both support beams in which both ends are pin-joined so as to freely rotate. The bending moment caused by the load of the vehicle 7 is supported by the endless chains 3 of the attachments 15 corresponding to both ends of the beam.
(See FIG. 6) does not work.

A concrete description will be given with reference to FIG. Figure 6
In, the bending moment is positive when the beam is bent upward, and negative when the beam is opposite. As shown in FIG. 6A, the load 2W of the vehicle 7 is assumed to act centrally on the beam in order to simplify the action of the bending moment. In the case of both support beams in which both ends are freely pinned, the supporting reaction forces P, P at the supporting points S at both ends of the beam are W, which is half the load 2W of the vehicle 7, while the bending moment is 0. Becomes In addition, a bending moment M having a magnitude of −Wg acts on the concave and convex fitting position located at a distance g from the left support point S. Bending moments acting on the pallet 9 and the attachments 15 on both sides thereof are as shown in FIG. 6 (b).

The bending moment M of the magnitude -Wg acting on the concave and convex fitting position acts to firmly fit the concave portion 23 and the convex portion 25. As shown in FIG. 7, the bending moment M causes the concave portion 23 and the convex portion 25 to have a vertical height h.
Are contacted at two contact points a, a different from each other. Due to the bending moment M, forces are applied to the pallet 9 at two contact points a, which are in opposite directions to each other and have the same magnitude R. A reaction force -R having a direction opposite to that of the acting force R and having the same magnitude acts. In addition, in FIG.
The directions of the two forces acting on the pallet 9 at the two contact points a are distributed in the horizontal direction, but one of innumerable possible force directions is illustrated.

Then, R × with respect to the pallet 9 by the bending moment M of the magnitude −Wg (see FIG. 6B).
The moment of h (see FIG. 7) acts. Therefore,
The leg portions 17 of the pallet 9 and the tip end portions of the attachments 15 have strength enough to withstand the bending moment M having a magnitude of -Wg.

Further, the concave side vertical surface 2 of the concave side inclined surface 29.
The inclination angle θ with respect to 7 increases as the angle increases.
While the attachment and detachment of the convex portion 25 and the convex portion 25 becomes easy, the force R acting on the pallet 9 increases due to the decrease in the distance h between the two contact points a, which facilitates the attachment and detachment and acts on the pallet 9. It is set to a predetermined value balanced with the increase in the force R.

According to this embodiment, the pair of attachments 15 are rotatably provided with respect to the endless chain 3, and the recesses 2 provided in the pair of attachments 15 are provided.
3 and the convex portion 25 provided on the pallet 9 are fitted together, so that the pallet 9 and each attachment 15 become, so to speak, two support beams in which both ends are pin-joined so as to freely rotate. It is possible to prevent a bending moment from acting on the support point S of the attachment 15. Therefore, a large bending moment M from the vehicle 7 does not act on the guide rail 21 via the attachment 15, and the guide rail 21 can have a relatively small strength to guide the attachment 15.

Further, since the pallet 9 and the pair of attachments 15 are integrated by fitting the concave portion 23 and the convex portion 25, the positioning accuracy is dramatically improved as compared with the conventional positioning by the engaging hole and the guide pin. However, the predetermined positioning accuracy can be obtained only by fitting the concavities and convexities.

Further, since the concave portion 23 is formed by the concave portion side inclined surface 29 so as to expand from the bottom surface toward the opening, and the convex portion 25 is formed by the convex portion inclined surface 33 in a tapered shape, the concave portion is formed. Convex portion 2 with respect to 23
5 can be easily attached and detached.

The concave portion and the convex portion according to the present invention may be provided in the pallet 9 and the attachment 15, respectively, contrary to the above-mentioned embodiment.

[0029]

As described above, according to the first aspect of the present invention, the pallet and the attachment are integrated like a beam by fitting the concave portion and the convex portion together, and each attachment is a hanging member. Since it is rotatably supported with respect to the pallet, the pallet and each attachment can be made to function like both support beams in which both ends can freely rotate, and a bending moment can be applied to the attachment support point. You can turn it off. With this, when a guide rail for guiding the attachment is provided, it is possible to prevent a large bending moment from the vehicle from acting on the guide rail via the attachment, and the guide rail can be guided to a relatively large extent. It can be stopped to a small strength.

Further, since the pallet and the attachment are integrated by fitting the concave portion and the convex portion, the positioning accuracy is dramatically improved as compared with the conventional positioning using the engaging hole and the guide pin.

According to the invention of claim 2, the concave portion is formed so that the concave portion expands from the bottom surface toward the opening, while the convex portion corresponds to the shape of the concave portion. Since it is formed so as to become thinner as it goes from the base portion to the tip end, it is possible to easily attach and detach the convex portion to the concave portion.

[Brief description of drawings]

FIG. 1 is a front view of a lifting device to which a pallet holding device according to an embodiment of the present invention is applied.

FIG. 2 is an enlarged front view of an essential part of the lifting device near the pallet holding device.

FIG. 3 is a plan view of FIG.

FIG. 4 is a front view of the pallet holding device.

FIG. 5 is a plan view of FIG.

FIG. 6A is a diagram showing a load applied to the pallet holding device, and FIG. 6B is a bending moment diagram.

FIG. 7 is a diagram showing a state in which a bending moment acts on a concave portion of an attachment and a convex portion of a pallet.

FIG. 8 is a front view of a conventional pallet holding device.

[Explanation of symbols]

 3 Endless chain (hanging member) 7 Vehicle 9 Pallet 11 Pallet holding device 15 Attachment 23 Recessed portion 25 Convex portion

Claims (2)

[Claims] 1. A pair of vertically movable hanging members provided at predetermined intervals so as to extend in the vertical direction, a pallet for mounting a vehicle provided between the pair of hanging members, and the pair of A pair of attachments that project toward the pallet on each of the hanging members and are rotatably provided with respect to the pair of hanging members, and are provided on one of a lower surface of the pallet and an upper surface of the pair of attachments. And the recess on the other of the lower surface of the pallet and the upper surface of the pair of attachments so as to face the recess in the vertical direction, and the recess is formed so that the pallet and the attachment are integrated like a beam. A pallet holding device, characterized in that the pallet holding device is provided with: 2. The concave portion is formed so as to expand as the concave portion expands from the bottom surface to the opening, while the convex portion is such that the convex portion goes from the base portion to the distal end in accordance with the shape of the concave portion. The pallet holding device according to claim 1, wherein the pallet holding device is formed to be thin.