JPH0853300A - Push-pull attachment - Google Patents

Abstract

PURPOSE:To continuously change the retreat end position of a face plate. CONSTITUTION:This push-pull attachment 1 has a restriction member allowing the continuous adjustment of a position for preventing the shrinkage of a distance between the opposite sides of the parallelogram section H of a pantograph 20 at the time of the collapse thereof. The restriction member is formed, for example, out of an arm section (main lever 11) rotatably supported at two positions of the first joint 221 and the segregation side 241 thereof, and held on the first joint 221, a reciprocating section (collar 12) reciprocating along the arm section and rotatably supported on the segregation side 241, and a stopper section double nut 13).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a push-pull attachment, which is one of the attachments of a forklift used mainly for loading and unloading cargo such as boxes and bags placed on a sheet pallet, and more particularly to a face plate. The present invention relates to regulation of a retracted position of a pantograph that moves the front and back.

[0002]

2. Description of the Related Art As shown in FIGS. 4 and 5, a conventional general push-pull attachment has a platen 91 for loading luggage below a holder 90 mounted on the front side of a forklift (not shown). The face plate 92 moves in the front-rear direction above the platen 91.

That is, the holder 90 and the face plate 92
An expandable pantograph 93 is arranged between the and, and the pantograph 93 is expanded and contracted in the front-rear direction by driving a push-pull cylinder 94 provided inside the holder 90, whereby the face plate 92 is moved in the front-rear direction. Move to.

At the lower end of the face plate 92, there is installed a gripper device 95 for gripping the end of the sheet pallet S when the bag-like loads W are loaded (pulled in) on the platen 91. Therefore, when the face plate 92 is advanced to the most front position by the extension of the pantograph 93, the end portion of the sheet pallet S is gripped by the gripper device 95, and then the face plate 92 is retracted by retracting the pantograph 93,
It is possible to pull the luggage W together with the sheet pallet S and load it on the platen 91.

[0005]

By the way, in the conventional push-pull attachment, when the load W is loaded on the platen 91, the tip of the platen 91 comes into contact with another load W to load the other load W. There is a problem of damage. That is, as shown in FIG. 4, when the front-rear length of the luggage W that is drawn in by the backward movement of the face plate 92 and loaded on the platen 91 is shorter than the effective front-rear length of the platen 91, the luggage W is loaded. Not platen 91
There is a problem that the tip end of the bag and the other luggage W come into contact with each other and the other luggage W is damaged.

To solve these problems, there has been proposed a method of restricting the retracted position of the pantograph 93 by installing a push-pull cylinder 94 having an adjuster 96 as shown in FIG. That is, pantograph 9
The retracted position of 3 is the rod 94 of the push-pull cylinder 94.
The push-pull cylinder 94 is provided with an adjuster 96 for restricting the maximum reduction amount of the rod 94a in view of the fact that the retracted position of the face plate 92 is determined as a result of the reduction amount of a. .

The adjuster 96 has a cylindrical shape and is rotatably attached to the tip end portion of the cylinder body of the push-pull cylinder 94, and the rod 94a goes in and out inside the adjuster 96. A plurality of engaging grooves 97 (three in FIG. 6) having different depths d are provided at the end of the adjuster 96 on the rod 94a side, and the engaging groove 97 is provided near the tip of the rod 94a. Engagement protrusions 98 that can be fitted into the mating grooves 97 are provided.

Therefore, when the rod 94a is contracted, the engaging convex portion 98 is fitted into one of the plurality of engaging grooves 97, so that the maximum contraction amount of the rod 94a is regulated variously depending on the depth d of the engaging groove 97. Will be done. As a result, by rotating the adjuster 96 in the direction of the arrow in FIG. 6 and selecting the engaging groove 97 that fits with the engaging convex portion 98, the retracted position on the pantograph 93, that is, the retracted position on the face plate 92 is set. Can be changed.

However, in the case where the maximum reduction amount of the rod 94a is regulated by the adjuster 96 as described above, the maximum reduction amount of the rod 94a is adjusted by the adjuster 9.
There is an inconvenience that the maximum reduction amount of the rod 94a, that is, the retracted position of the pantograph 93 cannot be continuously adjusted due to only the stepwise change depending on the depth d of the engaging groove 97 provided in FIG.

Moreover, the number of the engaging grooves 97 must be limited to the end of the adjuster 96 on the side of the rod 94a, so that the number of engaging grooves 97 is limited by itself.
Further, when the adjuster 96 slightly rotates in the direction of the arrow in FIG. 6 due to the operation vibration of the push-pull attachment or the like, the engagement protrusion 98 of the rod 94a and the engagement groove 97 cannot be fitted to each other, which is set. There is also a problem that the maximum reduction amount of the rod 94a, that is, the retracted position of the pantograph 93 cannot be obtained.

The present invention has been made in view of the above problems, and an object of the present invention is to make it possible to continuously change the restriction to the retracted position of the pantograph that moves the face plate in the front-rear direction, so that the platen can be changed. It is intended to provide a push-pull attachment which is effective in preventing damage to a load by the tip portion.

[0012]

According to a first aspect of the present invention, in a push-pull attachment that moves a face plate above and below a platen in a front-rear direction by expanding and contracting a pantograph, a parallelogram portion of the pantograph when the pantograph retracts. Is provided in the parallelogram portion of the pantograph, which is capable of preventing the distance between the two sides separated from each other from being reduced and preventing the reduction of the distance between the two sides at continuous positions. And

In the invention described in claim 1, the most remarkable thing is to provide a restricting member for preventing the distance between two separated sides (opposite sides) of the parallelogram portion of the pantograph from being reduced when the pantograph is degenerated. In addition, the restriction member is provided so that it is possible to prevent the distance between two separated sides of the parallelogram portion from being reduced at continuous positions.

According to the second aspect of the invention, the platen held by the holder, the face plate that moves in the front-rear direction above the platen, and one end of the face plate are connected to the holder. In a push-pull attachment having a pantograph whose other end is connected and expands and contracts, the pantograph is provided with a restricting member for restricting the maximum retracted position of the pantograph, and the restricting member is a parallelogram of the pantograph. A first node, which is one of the four nodes forming the part, and one of the two sides of the parallelogram part that does not contact the first node, 2
It is rotatably supported at a place, and further, the regulating member is
An arm portion rotatably supported at the first node, and a reciprocating movement along the arm portion, and a rotatably supported one of two sides of the parallelogram portion not in contact with the first node. And the return part that is fixed to the arm part,
And a stopper portion that abuts on the return portion and prevents the return portion from moving away from or closer to the first node, and the fixed position of the stopper portion with respect to the arm portion can be continuously adjusted. And

In the invention of claim 2, what is most noticeable is that the restricting member for restricting the maximum retracted position of the pantograph is the first node which is one of the four nodes forming the parallelogram portion of the pantograph, It is arranged such that it is rotatably supported at any one of two sides of the parallelogram portion which is not in contact with the first node and at two places.

The restricting member reciprocates along the arm portion rotatably supported at the first nodal point and the parallelogram part not contacting the first nodal point. And a return part rotatably supported on any one of the sides, and is fixed to the arm part and abuts on the return part to prevent the return part from moving away from or close to the first node. It is composed of a stopper portion. Further, the stopper portion of the regulating member is capable of continuously adjusting the fixed position with respect to the arm portion.

[0017]

According to the first aspect of the present invention, when the pantograph degenerates, the distance between the two separated sides of the parallelogram portion of the pantograph decreases as the pantograph degenerates. When the distance between the two sides is reduced to a certain position, the restricting member arranged in the parallelogram portion of the pantograph prevents the distance between the two sides from being reduced. As a result, the retracted position of the pantograph is regulated, and the final retracted position of the face plate is determined.

Moreover, since the regulating member can prevent the distance between the two sides of the parallelogram portion from being reduced at a continuous position, the blocking position for reducing the distance between the two sides is adjusted to an arbitrary position. It becomes possible. As a result, the retracted position of the pantograph can be regulated at an arbitrary position, and the final retracted position of the face plate can be arbitrarily changed.

Therefore, according to the invention of claim 1,
By restricting the retracted position of the pantograph at an arbitrary position, it is possible to change the final retracted position of the face plate arbitrarily. The position can be adjusted. As a result, it is difficult for the tip of the platen and the load to come into contact with each other, and the load is less likely to be damaged.

According to the second aspect of the invention, when the pantograph retracts, the restricting member provided on the pantograph restricts the maximum retracted position of the pantograph. That is, when the first node among the four nodes of the parallelogram part in the pantograph and one of the two sides of the parallelogram part that are not in contact with the first node come close to each other, they are supported by the first node. The return part, which is supported on any one of the two sides that is not in contact with the first node, moves in the direction away from or closer to the first node along the existing arm.

When the returning portion moves to a certain position in the direction away from the first node or in the direction in which it approaches, it comes into contact with the stopper portion fixed to the arm portion. as a result,
It is impossible to move the returning part, and the first node among the four nodes of the parallelogram part of the pantograph and one of the two sides not in contact with the first node are prevented from approaching each other. That is, the maximum retracted position of the pantograph is restricted by the restricting member, and the final retracted position of the face plate is determined.

Furthermore, since the fixing position of the stopper portion with respect to the arm portion of the regulating member can be continuously adjusted, the first node among the four nodes of the parallelogram portion of the pantograph and the first node One of the two sides that do not touch
It is possible to prevent the approach to the side at continuous positions. As a result, the maximum retracted position of the pantograph can be regulated at an arbitrary position, and the final retracted position of the face plate can be arbitrarily changed.

Therefore, according to the invention of claim 2,
As an embodiment of the invention described in claim 1, it is possible to achieve the same effect as the invention. That is, by limiting the maximum degenerate position of the pantograph at any position,
Since it is possible to arbitrarily change the final retracted position of the face plate, it is possible to adjust the final retracted position of the face plate so that the load is loaded even on the tip portion of the platen. As a result, it is difficult for the tip of the platen and the load to come into contact with each other, and the load is less likely to be damaged.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment embodying the push-pull attachment of the present invention will be described below with reference to FIGS. Push-pull attachment 1 in this example
Has a platen 31 for placing a sheet pallet S (see FIG. 4) below a holder 32 mounted on the front side of a cargo handling vehicle such as a forklift (not shown). The face plate 33 is adapted to move in the front-rear direction.

Then, the holder 32 and the face plate 3
An expandable pantograph 20 having one end connected to the holder 32 and the other end connected to the face plate 33 is provided between the pantograph 20 and the holder 3. That is, in the pantograph 20, the two link plates 20a and 20b are flexibly combined and are expandable. When the pantograph 20 is expanded and contracted in the front-rear direction by driving a push-pull cylinder (not shown), the face plate 33 is moved in the front-rear direction.

Further, a gripper device (not shown) is installed at the lower end portion of the face plate 33 as in the conventional case. The gripper device grips the end portion of the sheet pallet S and retracts the face plate 33. As a result, the luggage W (see FIG. 4) can be pulled together with the sheet pallet S and stacked on the platen 31.

An arm stopper 10 as a regulating member is provided on the side of the parallelogram portion H formed by the combination of the link arm 20a and the link arm 20b in the pantograph 20. This arm stopper 10 is, as shown in FIGS. 3 and 4,
Four nodes forming the parallelogram portion H in the pantograph 20, that is, the link arm 20a and the link arm 2
Four nodes 221, 222, 223, which intersect with 0b
, 224, and one of the two separating sides 241 and 242 of the parallelogram part H that is not in contact with the first connecting point 221. Each is rotatably supported and attached.

As shown in FIGS. 1 and 2, the arm stopper 10 has a main lever 11 as an arm portion whose base end is pivotally supported at the first node 221. A short cylindrical boss 111 (FIG. 2) is formed at the base end of the main lever 11, and the inside of the boss 111 is axially fixed at the intersection of the link arm 20a and the link arm 20b. The main lever 11 is rotatably attached to the first node 221 by inserting a shaft member for doing so.

A substantially cylindrical collar 12 is reciprocally inserted into the arm stopper 10 as a return portion rotatably attached to the separated side 241 with respect to the main lever 11. . As shown in FIG. 2, a short columnar projection 122 is formed on a side portion of the collar 12, and the projection 122 is preliminarily drilled in a separation side 241 which is a part of the link arm 20b. The pin hole 12 which is inserted into the provided insertion hole 249 and is formed in the projection 122.
The collar 12 is rotatably attached to the separation side 241 by driving and fixing a pin (not shown) into the collar 3.

Further, a male screw 119 is formed at the tip of the main lever 11 of the arm stopper 10, and a double nut 13 consisting of a pair of nuts 131 and 132 having female screw holes is screwed on the male screw 119 as a stopper. Have been combined. Therefore, by rotating the double nut 13, the fixing position of the double nut 13 with respect to the main lever 11 can be adjusted steplessly, that is, continuously.

The operation and effect of the push-pull attachment 1 of the present example configured as above will be described below. When the pantograph 20 degenerates, the pantograph 2
The arm stopper 10 arranged at 0 regulates the maximum retracted position of the pantograph 20.

That is, when the pantograph 20 is degenerated, the four nodes 22 of the parallelogram portion H in the pantograph 20 are reduced.
First node 221 among 1, 222, 223 and 224
And the separation side 241 not in contact with the first node 221 approach each other, and the collar 12 supported by the separation side 241.
Moves in a direction away from the first node 221 along the main lever 11 whose base end is supported by the first node 221.

The color 12 remains as it is at the first node 2
As it moves away from 21, it comes into contact with the double nut 13 fixed to the tip of the main lever 11. As a result, it becomes impossible for the collar 12 to move along the main lever 11, and the first node 221 of the parallelogram portion H of the pantograph 20 and the separation side 241 not in contact with the first node 221 are separated. Access is blocked.

Therefore, the maximum retracted position of the pantograph 20 is restricted by the arm stopper 10, and the final retracted position of the face plate 33 is determined.
That is, the pantograph 20 can be expanded and contracted within a range in which the collar 12 of the arm stopper 10 can move along the main lever 11, and the maximum retracted position of the pantograph 20 is determined by the position where the collar 12 contacts the double nut 13. Then, the final retreat position of the face plate 33 is determined.

Further, the fixing position of the double nut 13 with respect to the main lever 11 in the arm stopper 10 is
Nut 131 and nut 1 that compose the double nut 13.
It can be continuously adjusted by rotating 32.
Therefore, it is possible to prevent the first node 221 of the parallelogram portion H of the pantograph 20 from approaching the spaced edge 241 that is not in contact with the first node 221 at continuous positions, and the maximum degeneracy of the pantograph 20. It is possible to regulate the position at any position.

As a result, the last retracted position of the face plate 33 can be arbitrarily changed. Therefore, according to the push-pull attachment 1 of this example, the last retracted position of the face plate 33 can be arbitrarily changed, so that the last retracted position of the face plate 33 is adjusted to the front-rear length of the luggage W on the sheet pallet S. Can be set.

That is, in order to load the luggage W on the platen 31, when the face plate 33 is most retracted, the last retracted position of the face plate 33 is set to the platen 31.
It is possible to adjust the position such that the luggage W is loaded up to the tip of the and no space is created on the upper surface thereof. as a result,
When the luggage W is loaded, it is possible to extremely reduce the contact of the tip portion of the platen 31 with the other luggage W placed on the platen 31, which is extremely effective in preventing the luggage W from being damaged. It becomes effective.

Further, the arm stopper 10 of this embodiment is simply composed of the main lever 11, the collar 12, and the double nut 13, which are extremely easy to process and manufacture, and raises the price of the push-pull attachment 1 itself. It is possible to provide without.

Further, since the arm stopper 10 is attached to the side portion of the pantograph 20 as described above, the assembling operator can easily attach the arm stopper 10 without being hindered by other parts and members. Moreover, by mounting the pantograph 20 on the side portion, the function of reinforcing the strength of the pantograph 20 in the left-right direction (direction orthogonal to the expansion / contraction direction) is provided.

Furthermore, in the case where the arm stopper 10 of this example is provided on the front side of a cargo handling vehicle such as a forklift,
Since the fixed position of the double nut 13 with respect to the main lever 11 is at a position where it can be easily visually recognized from the driver's seat of a cargo handling vehicle such as a forklift, the position of the double nut 13 with respect to the main lever 11 is appropriate while being in the driver's seat. You can also judge whether or not.

Although the push-pull attachment 1 of this embodiment is provided with the double nut 13 as the stopper portion of the arm stopper 10, the present invention is not limited to this. For example, a cylindrical piece having a substantially same shape as the collar 12 and having a slit and having an outer diameter that can be tightened with a ring-shaped ring may be used. By using this cylindrical piece, the male screw 11 is attached to the tip of the main lever 11 of the arm stopper 10.
A new effect is derived that it is not necessary to form 0.

Further, in the push-pull attachment 1 of this example, the first node 221 of the parallelogram portion H in the pantograph 20 and the separated side 241 not in contact with the first node 221 are attached at two positions. ， It is not limited to this. That is, the four nodes 221, 222, 223 and 22 of the parallelogram portion H in the pantograph 20.
One of the three nodes other than the first node 221 of 4 and the parallelogram portion H that does not touch the node
Even if it is attached at two locations such as the remote side, the same effect as the push-pull attachment 1 of this example can be obtained.

When arm stoppers are attached to the second and fourth nodes 222 and 224, the pantograph 20
When retracted, the collar 12 moves in a direction approaching the nodes 222 and 224, so the double nut 13 must be arranged between the collar 12 and the nodes 222 and 224.

[Brief description of drawings]

FIG. 1 is a schematic side view of a push-pull attachment 1 embodying the present invention.

FIG. 2 is an exploded perspective view of an arm stopper 10 as a regulation member according to the embodiment of the present invention.

FIG. 3 is a principle explanatory diagram of an arm stopper 10 as a restricting member according to an embodiment of the present invention.

FIG. 4 is a side view of a conventional push-pull attachment.

FIG. 5 is a side view of the conventional push-pull attachment.

FIG. 6 is a side view of a push-pull cylinder included in a conventional push-pull attachment.

[Explanation of symbols]

 1. ． ． Push-pull attachment, 10. ． ． Arm stopper, 11. ． ． Main lever, 12. ． ． Color, 13. ． ． Double nuts, 20. ． ． Pantograph, 221. ． ． First node, 241. ． ． Separation edge, 31. ． ． Platen, 32. ． ． Holder, 33. ． ． Face plate,

Claims (2)

[Claims] 1. A push-pull attachment for moving a face plate above and below a platen in a front-back direction by expanding and contracting a pantograph, which prevents the distance between two separated sides of a parallelogram part of the pantograph from being reduced when the pantograph is retracted. In addition, the push-pull attachment is characterized in that a regulating member capable of preventing the reduction of the distance between the two sides at a continuous position is arranged in the parallelogram portion of the pantograph. 2. A platen held by a holder, a face plate that moves in the front-rear direction above the platen, and a pantograph that has one end connected to the holder and the other end connected to the face plate to expand and contract. In the push-pull attachment provided with, the pantograph is provided with a restricting member for restricting the maximum retracted position of the pantograph, and the restricting member is one of four nodes forming the parallelogram portion of the pantograph. First
The node is rotatably supported at two points, one of the two sides of the parallelogram portion that is not in contact with the first node, and the regulating member is rotatably attached to the first node. An arm part to be supported, a reciprocating part which is reciprocally moved along the arm part, and is rotatably supported on any one of two sides of the parallelogram part which is not in contact with the first node; The first part of the returning part is fixed to the arm part and abuts against the returning part.
A push-pull attachment, comprising: a stopper portion that blocks a distance from or close to a node, and a fixed position of the stopper portion with respect to the arm portion can be continuously adjusted.