JP7003618B2 - Forklift cargo handling equipment - Google Patents

Description

The present invention relates to a cargo handling device for a forklift.

In a forklift, cargo handling work is performed by raising and lowering the lift bracket to which the fork is attached. A lift chain attached to the lift bracket is used to raise and lower the lift bracket. One end of the lift chain is attached to the lift bracket and the other end is attached to the chain anchor member provided on the mast. Further, the lift chain is suspended on a chain wheel attached to the inner mast provided on the mast. The lift bracket attached to one end of the lift chain moves up and down by raising and lowering one end of the lift chain by raising and lowering the inner mast.

The lift chain is attached to the chain anchor member of the outer mast. The lift chain needs to be firmly attached to the outer mast after the tension is adjusted during installation so that it can withstand cargo handling work. Therefore, conventionally, the lift chain is attached to the chain anchor member by fastening the lift chain while adjusting the tension of the chain using three nuts.
When the lift chain is hung around the chain wheel, it is desirable that the lift chain and the chain wheel are in uniform contact. Therefore, it is necessary to attach the lift chain to the chain anchor member so that the lift chain is not twisted in the longitudinal direction of the lift chain.
Therefore, in the work of attaching the lift chain, it is necessary to perform both the work of adjusting the tension of the lift chain and the work of preventing the lift chain from twisting, which is difficult to perform and requires a lot of man-hours.

Therefore, for example, Patent Document 1 discloses a configuration including a bolt portion that can rotate in the longitudinal direction of the lift chain. This bolt portion prevents the lift chain from being fixed to the mast in a twisted state.

Japanese Patent Application Laid-Open No. 2003-81589

However, in the configuration of Patent Document 1, since three nuts arranged above and below the chain anchor member are used for fixing the lift chain, the number of parts used for attaching the lift chain is still large. Therefore, there still remains a problem that it is difficult to adjust the tension of the lift chain and to attach the lift chain.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a cargo handling device for a forklift, which has a smaller number of parts than the conventional one, and can easily adjust the tension of the lift chain and attach the lift chain. be.

In order to solve the above problems, the forklift cargo handling device of the present invention includes a chain anchor member formed on the outer mast of the mast mechanism, a lift chain having one end attached to a lift bracket, and the other end of the lift chain. A forklift cargo handling device including a mounting member provided in the chain anchor member and fixed to the chain anchor member. The chain anchor member is provided with a female screw hole, and the mounting member is attached to the other end of the lift chain. Anchor bolts having a holder member provided, a bolt head connected to the holder member, and an anchor bolt having a male screw portion screwed into the female screw hole, and the male screw portion screwed into the female screw hole are used as the chain anchor member. With a nut that is fixed and abuts against the chain anchor member, the holder member is attached to the other end of the lift chain and has an insertion space into which the bolt head is inserted. The bolt head is provided with a ring that holds the bolt head inserted into the insertion space and is welded to the holder with a welded portion, and the bolt head is provided with an annular groove for loosely fitting the ring, and the anchor bolt is provided. Is rotatable about the axis of the anchor bolt with respect to the holder member.

According to the present invention, the lift chain is attached to the mast by screwing an anchor bolt supported by the lift chain and rotatable about the axis into the chain anchor member. That is, the work of attaching the lift chain to the mast can be easily performed by screwing the attachment member into the chain anchor member, and the tension of the lift chain can be easily adjusted. Further, by screwing the anchor bolt into the chain anchor member, the roles of the two nuts conventionally arranged under the chain anchor member can be integrated into one nut. This reduces the number of parts of the mounting member.

Further, in the cargo handling device of the forklift, the holder member is attached to the other end of the lift chain, and has a holder main body having an insertion space into which the bolt head is inserted, and the holder body inserted into the insertion space. A ring for holding the bolt head may be provided, and the bolt head may be provided with an annular groove for loosely fitting the ring.

Further , the anchor bolt has a simple structure and can be rotatably supported at the end of the lift chain about the axis.

Further, in the cargo handling device of the forklift, a flat surface for locking a tool parallel to the axis of the anchor bolt may be formed on the outer peripheral surface of the bolt head.

By providing flat surfaces parallel to each other around the axis of the anchor bolt, the mounting operator can use the tool for screwing the anchor bolt. Therefore, it is easy to screw the anchor bolt into the chain anchor member.

According to the present invention, it is possible to provide a cargo handling device for a forklift, which has a smaller number of parts than the conventional one and can easily adjust the tension of the lift chain and attach the lift chain.

It is a side view of the forklift which concerns on embodiment. It is a perspective view which shows the main part of the cargo handling apparatus of the forklift which concerns on embodiment. It is a perspective view of the chain anchor plate of the cargo handling apparatus of the forklift which concerns on embodiment. It is a vertical sectional view of the chain anchor bolt which concerns on embodiment. It is an exploded perspective view which shows the main part of the holder and the anchor bolt which concerns on embodiment.

Hereinafter, the cargo handling device of the forklift according to the embodiment of the present invention will be described with reference to FIGS. 1 to 5.

As shown in FIG. 1, the forklift 1 as an industrial vehicle is provided with a cargo handling device 4 at the front portion of the vehicle body 2. A driver's seat 3 is provided near the center of the vehicle body 2. A drive wheel 5 as a front wheel is provided on the front portion of the vehicle body 2, and a steering wheel 6 as a rear wheel is provided on the rear portion of the vehicle body 2. A counterweight 7 is provided at the rear of the vehicle body 2, and the counterweight 7 is for adjusting the weight of the vehicle and balancing the weight of the vehicle body 2.

The cargo handling device 4 includes a lift bracket 15 including a mast mechanism 10 and a fork 13. As shown in FIG. 2, the mast mechanism 10 includes a pair of left and right outer masts 11, a pair of left and right inner masts 12, and an upper beam 17.

The outer mast 11 is attached to the front portion of the vehicle body 2 of the forklift 1. As shown in FIG. 2, the upper ends of the pair of left and right outer masts 11 are connected by the upper beam 17. Inside the pair of left and right outer masts 11 in the vehicle width direction, a pair of left and right inner masts 12 that can be raised and lowered with respect to the outer mast 11 are provided. As shown in FIG. 3, the outer mast 11 includes a chain anchor plate 18 as a chain anchor member. The chain anchor plate 18 is attached by welding near the upper end of the outer mast 11. The chain anchor plate 18 is made of a plate material. Further, the chain anchor plate 18 is provided with a female screw hole 19 that penetrates the chain anchor plate 18. The female screw hole 19 is formed inside the chain anchor plate 18 in the vehicle width direction. The female screw hole 19 includes a female screw portion 19A. The chain anchor plate 18 is connected to the upper beam 17 by a connecting bracket 20.

As shown in FIG. 2, the inner mast 12 can be raised and lowered along the outer mast 11 by the lift cylinder 16. The upper end portion 12A of the inner mast 12 includes a chain wheel 21. The chain wheel 21 has a central shaft 22 extending in the vehicle width direction, and is adapted to freely rotate around the central shaft 22. A lift chain 24 is hung around the chain wheel 21.

The lift bracket 15 is attached so as to be able to move up and down along the inner mast 12. One end 24A as a moving end of the lift chain 24 is connected to the lift bracket 15. One end 24A as a moving end of the lift chain 24 includes a bracket mounting member (not shown) for mounting on the lift bracket 15. The other end 24B as a fixed end of the lift chain 24 is connected to the chain anchor plate 18 via a mounting member 26 described later. By raising and lowering the inner mast 12, the chain wheel 21 attached to the upper end of the inner mast 12 moves up and down, and the lift chain 24 hung on the chain wheel 21 moves up and down. Therefore, one end 24A of the lift chain 24 functions as a moving end, and the other end 24B of the lift chain 24 functions as a fixed end, so that the lift bracket 15 moves up and down. Therefore, the fork 13 attached to the lift bracket 15 can be raised and lowered by raising and lowering the inner mast 12.

As shown in FIG. 2, the lift chain 24 is attached to the mast mechanism 10 by being turned by the chain wheel 21 near the upper end of the inner mast 12. As shown in FIG. 5, the lift chain 24 includes a chain plate 39 and a pin 40. Plate holes (not shown) are formed near both ends of the chain plate 39 in the longitudinal direction so that the pins 40 can be inserted. The plurality of chain plates 39 are arranged so that the plate holes provided in the chain plate 39 are alternately overlapped with each other. The chain plates 39 that overlap each other are connected by the pins 40, so that the chain plates 39 rotate around the pins 40. The other end 24B of the lift chain 24 as a fixed end is provided with a mounting member 26 for mounting the lift chain 24 to the chain anchor plate 18. As shown in FIG. 4, the mounting member 26 includes an anchor bolt 27 having a male screw portion 28 and a head 29, and a holder 36 as a holder main body portion.

As shown in FIGS. 4 and 5, the bottomed cylindrical holder 36 includes a hollow portion 37 as an insertion space. The diameter of the hollow portion 37 is formed to be larger than that of the head 29. Further, the holder 36 includes a stay 38 provided with a stay hole 38A into which the pin 40 can be inserted, and the holder 36 is arranged so that the plate hole of the lift chain 24 and the stay hole 38A overlap with each other, and then the pin 40 is provided. Is passed through the overlapping stay holes 38A and plate holes. As a result, the holder 36 is not only attached to the other end 24B of the lift chain 24, but is also rotatably supported around the pin 40 inserted through the stay hole 38A.

As shown in FIGS. 4 and 5, the anchor bolt 27 includes a male screw portion 28 that can be screwed into the female screw hole 19 and a head 29 as a bolt head.
The male threaded portion 28 matches the shape of the female threaded portion 19A of the female threaded hole 19 formed in the chain anchor plate 18. Further, a nut 41 is screwed into the anchor bolt 27 in order to firmly fix the anchor bolt 27 to the chain anchor plate 18.
The head 29 includes a handle portion 29A on the male screw portion 28 side and a support portion 29B on the tip end side. The outer peripheral diameter of the head 29 is larger than the outer peripheral diameter of the male screw portion 28. The outer peripheral surface of the handle portion 29A includes at least one pair of parallel two-sided portions (two pairs in FIGS. 4 and 5). The parallel two-sided portion is formed of two flat surfaces 34 parallel to each other so as to sandwich the central shaft 22, and is used as a place for hanging a spanner as a tool used when screwing the male screw portion 28.

As shown in FIG. 4, the support portion 29B of the anchor bolt 27 is surrounded by the holder 36. The outer peripheral diameter of the support portion 29B is substantially the same as the outer peripheral diameter of the handle portion 29A.
Further, a groove portion 31 as an annular groove is formed between the handle portion 29A and the support portion 29B, and a C-ring-shaped annular plate 32 as a ring is fitted in the groove portion 31. The inner peripheral diameter of the annular plate 32 is larger than the outer peripheral diameter of the groove portion 31 and smaller than the outer peripheral diameter of the support portion 29B of the head 29. Further, the outer peripheral diameter of the annular plate 32 is larger than the outer peripheral diameter of the support portion 29B. Therefore, the annular plate 32 is loosely fitted in the groove portion 31. As shown in FIG. 4, the anchor bolt 27 is supported with respect to the holder 36 by an annular plate 32 welded to the end face of the holder 36 on the opening side with a welded portion (bead) W. Specifically, as shown in FIG. 5, when the support portion 29B is flexed with respect to the holder 36 attached to the other end 24B of the lift chain 24, the annular plate 32 fitted in the groove portion 31 of the anchor bolt 27 is formed. It is arranged at a position where it comes into contact with the end face of the holder 36 on the opening side. By welding the annular plate 32 to the holder 36, the support portion 29B of the anchor bolt 27 does not come off. The annular plate 32 and the holder 36 correspond to the holder member.

Next, the work of attaching the lift chain 24 to the chain anchor plate 18 via the attachment member 26 will be described.
First, the operator attaches one end 24A of the lift chain 24 to the lift bracket 15 arranged in front of the mast mechanism 10 by a bracket mounting member. Next, the operator hangs the lift chain 24 on the chain wheel 21 of the inner mast 12 like a suspension pulley. Then, the operator attaches the other end 24B of the lift chain 24 hung on the chain wheel 21 to the chain anchor plate 18. Here, the mounting member 26 is used for mounting the other end 24B of the lift chain 24. The operator screwes the anchor bolt 27 of the mounting member 26 into the female screw hole 19 of the chain anchor plate 18. The anchor bolt 27 constituting the mounting member 26 is rotatable about the axis of the anchor bolt 27 with respect to the holder 36. Therefore, even if the operator screwes the anchor bolt 27 into the female screw hole 19 of the chain anchor plate 18, the lift chain 24 can be attached without twisting. The tension of the lift chain 24 is adjusted by screwing in the anchor bolt 27. When the lift chain 24 reaches the specified tension, the screwing of the anchor bolt 27 is stopped. Then, the nut 41 is attached to the male threaded portion 28 of the anchor bolt 27 screwed into the chain anchor plate 18, and is brought into contact with the chain anchor plate 18 and fastened. This completes the work of attaching the lift chain 24.

The cargo handling device 4 of the forklift 1 according to the present embodiment has the following effects.
(1) The mounting member 26 formed at the end of the lift chain 24 mounted on the chain anchor plate 18 is an anchor bolt that can rotate about the axis of the anchor bolt 27 with respect to the holder 36 of the lift chain 24. 27 is provided, and the chain anchor plate 18 is provided with a female screw hole 19. Anchor bolts 27 are screwed into the female screw holes 19 of the chain anchor plate 18, and after adjusting the tension of the lift chain 24, the nut 41 is attached to the anchor bolts 27 and fastened to the lift chain 24 to the chain anchor plate 18. Installation work is completed. Since the number of parts to be adjusted is small, the operator who installs the lift chain 24 can reduce the man-hours required for the installation and can easily adjust the tension of the lift chain 24. Further, it is possible to prevent the lift chain 24 from being twisted during the mounting work of the lift chain 24.

(2) Since the anchor bolt 27 is rotatable with respect to the holder 36, it is also rotatable in the longitudinal direction of the lift chain 24 to which the holder 36 is attached. Therefore, it is possible to prevent the lift chain 24 from being twisted during cargo handling.

(3) The lift chain 24 is fastened by attaching the nut 41 to the male screw portion 28 of the anchor bolt 27 after adjusting the tension of the lift chain 24 by screwing the female screw hole 19 of the anchor bolt 27. It is attached to the chain anchor plate 18. As a result, the axial force of the anchor bolt 27 acts between the chain anchor plate 18 and the nut 41. Therefore, the effect of preventing the anchor bolt 27 from loosening with respect to the chain anchor plate 18 is produced, and the lift chain 24 can be firmly attached to the chain anchor plate 18.

(4) The holder 36 of the mounting member 26 is provided with a stay 38, and the lift chain 24 is mounted on the stay 38 by connecting the pins 40. As a result, the anchor bolt 27 of the mounting member 26 is rotatable with respect to the lift chain 24, and the other end 24B of the lift chain 24 can be prevented from being deformed or twisted.

(5) In the anchor bolt 27, a groove portion 31 as an annular groove is formed between the handle portion 29A and the support portion 29B, and the annular plate 32 as a ring is fitted in the groove portion 31. The annular plate 32 is welded to the end surface of the holder 36 on the opening side with a welded portion W, and supports the anchor bolt 27 with respect to the holder 36. With this configuration, the anchor bolt 27 does not fall off from the support portion 29B with a simple structure, and the anchor bolt 27 can be rotatably supported on the other end 24B of the lift chain 24 around the central shaft 22.

(6) The handle portion 29A of the anchor bolt 27 includes at least one pair of parallel two-sided portions formed from two parallel flat surfaces 34 so as to sandwich the central axis 22. As a result, the operator can rotate the anchor bolt 27 by locking a tool such as a spanner to the flat surface 34 in the screwing operation of the anchor bolt 27. Therefore, it is easy to screw the anchor bolt 27 into the chain anchor plate 18.

The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the gist of the invention. For example, the present invention may be modified as follows.

○ In the above embodiment, the fork 13 is attached to the lift bracket 15, but this is not the case. The lift bracket 15 is not limited to the fork 13, and for example, a roll clamp device, a push-pull mechanism, or the like may be attached as an attachment for cargo handling work.

○ In the above embodiment, the flat surface 34 is formed on the head 29 as a means for facilitating the rotation of the anchor bolt 27, but the means for facilitating the rotation of the anchor bolt 27 is not limited to the flat surface 34. For example, an insertion hole may be formed in the head 29 of the anchor bolt 27, a rod material may be inserted into the insertion hole, and the anchor bolt 27 may be rotated using the rod material. In that case, the anchor bolt 27 can be screwed into the chain anchor plate 18 by inserting a handle that can be inserted into the insertion hole into the insertion hole and turning the handle. The insertion hole may be a bottomed hole or a penetrating hole.

10 ... Mast mechanism, 11 ... Outer mast, 12 ... Inner mast, 18 ... Chain anchor plate as chain anchor member, 19 ... Female screw hole, 24 ... Lift chain, 26 ... Mounting member, 27 ... Anchor bolt, 28 ... Male thread part, 29 ... Head as bolt head, 30 ... Support, 31 ... Groove as annular groove, 32 ... Annular plate as ring, 34 ... Flat surface, 36 ... Holder as holder body, 37 ... As insertion space Hollow part, 41 ... nut.

Claims (2)

The chain anchor member formed on the outer mast of the mast mechanism,
A lift chain with one end attached to the lift bracket,
A forklift cargo handling device provided with a mounting member provided at the other end of the lift chain and fixed to the chain anchor member.
The chain anchor member has a female screw hole and has a female screw hole.
The mounting member is
A holder member provided at the other end of the lift chain and
Anchor bolts having a bolt head connected to the holder member and a male screw portion that can be screwed into the female screw hole,
The male screw portion screwed into the female screw hole is fixed to the chain anchor member, and has a nut that comes into contact with the chain anchor member .
The holder member is
A holder body that is attached to the other end of the lift chain and has an insertion space into which the bolt head is inserted.
A ring that holds the bolt head inserted into the insertion space and is welded to the holder body portion with a welded portion is provided.
The bolt head comprises an annular groove for loosely fitting the ring.
The anchor bolt is a cargo handling device for a forklift, characterized in that the anchor bolt can rotate about the axis of the anchor bolt with respect to the holder member. The cargo handling device for a forklift according to claim 1 , wherein a flat surface for locking a tool parallel to each other is formed on the outer peripheral surface of the bolt head. ..

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