Stopper block retaining structure, stopper block and block

Abstract

To provide a stopper block locking structure higher in work efficiency than conventionally.SOLUTION: A stopper block locking structure S comprises: a block 2; a stopper block 3; a swing member 4; and a shaft member 5. The block 2 includes a stopper block insertion hole 22a and a stopper 23. The stopper block 3 includes a second slide limit part 32. The swing member 4 includes a second lock 42, and connected through the shaft member 5 to the stopper block 3 so as to be vertically swingable. After the second slide limit part 32 is inserted into the stopper block insertion part 22, the swing member 4 is swung downward and a part of the second lock 42 is disposed below the stopper 23, thus preventing removal of the stopper block 3.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a stopper block retaining structure for use in a forklift attachment, and to a stopper block and a block used in the stopper block retaining structure. [Background technology]

[0002] As disclosed in Patent Document 1, there is a large forklift equipped with a ram-type attachment and a shift cylinder that slides the attachment in the left-right direction. This type of forklift is equipped with upper and lower finger bars, and as disclosed in Patent Document 2, some forklifts are configured so that the attachment can be attached to and detached from the upper and lower finger bars.

[0003] 8A and 8B show a ram-type attachment 1 and a fork-type attachment 1, respectively. The fork-type attachment 1 is mounted on a forklift as a pair of left and right attachments 1. As shown in FIG. 8A and FIG. 8B, each attachment 1 has a vertical portion 10, an upper hook 11, a lower hook 12, a cylinder bracket 13, and a support portion 14. The ram-type attachment 1 has left and right vertical portions 10, and the upper hook 11, the lower hook 12, the cylinder bracket 13, and the support portion 14 are provided on each vertical portion 10. In the case of the fork-type attachment 1, the left and right attachments 1 are each provided with the vertical portion 10, the upper hook 11, the lower hook 12, the cylinder bracket 13, and the support portion 14. The upper hook 11 is provided at the upper end of the vertical portion 10, the lower hook 12 is provided at the vertical center of the back surface of the vertical portion 10, and the support portion 14 protrudes from the lower portion of the back surface of the vertical portion 10.

[0004] A, B, and C in Figure 9 are side views showing a conventional method of arranging a fork-type attachment 1 and block 2, and D is an enlarged side view of the area around block 2 in C. When this attachment 1 is mounted on a forklift, first the upper and lower hooks are engaged from above the upper and lower finger bars as shown in Figure 9A, and then the block 2 is inserted into the gap between the lower finger bar LF and the support part 14 as shown in Figure 10. This restricts the vertical movement of the attachment 1, so that the attachment 1 will not come off the forklift.

[0005] 9 to 11, the block 2 includes a block body 20, a first slide limiting portion 21, and a stopper block insertion portion 22. When the block 2 is inserted into the gap between the lower finger bar LF and the support portion 14, the first slide limiting portion 21 is disposed adjacent to the support portion 14, thereby limiting the movement of the block 2 in the left-right direction (to the right in this example).

[0006] When the attachment 1 is fixed to the forklift, the shift cylinder is passed through the cylinder bracket 13 and fixed by the cylinder bracket stopper BS as shown in FIG. 9B and FIG. 9C. Also, as shown in FIG. 10, the stopper block 3 is inserted into the stopper block insertion portion 22 of the block 2. The stopper block 3 has a first locking portion 30 and a second slide limiting portion 32. The first locking portion 30 is locked to the stopper block insertion portion 22, and the second slide limiting portion 32 is arranged so that a portion protruding from the bottom of the stopper block insertion portion 22 is adjacent to the support portion 14, thereby limiting the left-right movement of the block 2. The stopper block insertion portion 22 has a hole penetrating in the front-rear direction, and after the stopper block 3 is inserted, a fixing pin FP is inserted into the hole. This prevents the stopper block 3 from coming off.

[0007] Fig. 12 is a diagram showing the reversed block 2 inserted from the opposite direction and other configurations. As shown in Fig. 12, the stopper block insertion portion 22 has two more holes penetrating in the left-right direction, and a spring plunger SP is inserted into each of the holes. The tip of the spring plunger SP abuts against the stopper block 3 and the fixing pin FP, and the biasing force of the spring plunger SP prevents the stopper block 3 and the fixing pin FP from coming off.

[0008] As explained above, the conventional stopper block retaining structure for fixing the stopper block 3 uses a total of three parts, the fixing pin FP and the spring plunger SP, to prevent the stopper block 3 from coming off, which is inefficient. In addition, the fixing pin FP and the spring plunger SP are small and easy to lose. Moreover, the spring plunger SP can become stuck due to mud or other stains, making it difficult to remove the stopper block 3. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] JP 2021-178693 A [Patent Document 2] Japanese Patent Application Publication No. 8-108999 Summary of the Invention [Problem to be solved by the invention]

[0010] SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to provide a stopper block retaining structure which is more efficient to work with than conventional structures. [Means for solving the problem]

[0011] In order to solve the above problems, the stopper block removal prevention structure according to the present invention comprises: A stopper block removal prevention structure for an attachment fixing structure for fixing an attachment to a forklift, the attachment having a vertical portion, upper and lower hooks provided on the vertical portion and engaged with an upper finger bar and a lower finger bar of the forklift, and a support portion protruding from a back surface of the vertical portion, a block, a stopper block, a swing member, and a shaft member, The block is a block body having upper and lower surfaces extending horizontally and inserted from the left and right into a gap between the lower finger bar and the support portion; a first slide limiting portion that is fixed to either the left or right side surface of the block body, extends downward from the block body, and is adjacent to the support portion, thereby limiting the movement of the block body to either the left or right; a stopper block insertion portion having an insertion hole extending vertically and fixed to a side surface of the block body on the opposite side to the first slide limiting portion; a stopper fixed to both or either of a front surface and a rear surface of the stopper block insertion portion; The stopper block is a first locking portion having a first hole through which the shaft member passes in the front-rear direction and locked to the stopper block insertion portion; a second slide limiting portion extending continuously from the first engaging portion in the vertical direction, being inserted into the stopper block insertion portion, and being adjacent to the support portion to limit the movement of the block to either the left or right; The swing member is a connecting portion having a second hole at a base end through which the shaft member passes in the front-rear direction and connected to the stopper block via the shaft member so as to be swingable in the up-down direction; a second locking portion that is continuous with the tip of the connecting portion and that is partially disposed below the stopper when the second locking portion is swung downward together with the connecting portion; After the stopper block is inserted into the stopper block insertion portion from above, the swinging member is swung downward so that a part of the second engaging portion is positioned below the stopper, thereby preventing the stopper block from coming off.

[0012] The stopper block retaining structure is preferably The tip of the stopper protrudes in the left-right direction beyond the block body.

[0013] The stopper block retaining structure is preferably The rocking member is formed substantially in an L-shape or an inverted L-shape.

[0014] The stopper block retaining structure is preferably Stoppers are disposed on both the front and rear surfaces of the stopper block insertion portion, and the rocker member is formed substantially in an inverted T-shape.

[0015] In order to solve the above problems, the stopper block according to the present invention comprises: A stopper block used in a stopper block slip-out prevention structure in an attachment fixing structure for fixing an attachment to a forklift, the attachment having a vertical portion, upper and lower hooks provided on the vertical portion and engaged with an upper finger bar and a lower finger bar of the forklift, and a support portion protruding from a back surface of the vertical portion, The stopper block retaining structure includes a block, The block is a block body having upper and lower surfaces extending horizontally and inserted from the left and right into a gap between the lower finger bar and the support portion; a first slide limiting portion that is fixed to either the left or right side surface of the block body, extends downward from the block body, and is adjacent to the support portion, thereby limiting the movement of the block body to either the left or right; a stopper block insertion portion having an insertion hole extending vertically and fixed to a side surface of the block body on the opposite side to the first slide limiting portion; a stopper fixed to both or either of a front surface and a rear surface of the stopper block insertion portion; The stopper block is The stopper block has a main body, a swing member, and a shaft member. The stopper block body is a first locking portion having a first hole through which the shaft member passes in the front-rear direction and locked to the stopper block insertion portion; a second slide limiting portion extending continuously from the first engaging portion in the vertical direction, being inserted into the stopper block insertion portion, and being adjacent to the support portion to limit the movement of the block to either the left or right; The swing member is a connecting portion having a second hole at a base end through which the shaft member passes in the front-rear direction and connected to the stopper block body via the shaft member so as to be swingable in the up-down direction; a second locking portion that is continuous with the tip of the connecting portion and that is partly disposed below the stopper when the second locking portion is swung downward together with the swinging member; After the stopper block body is inserted into the stopper block insertion portion from above, the swinging member is swung downward so that a part of the second locking portion is positioned below the stopper, thereby preventing the stopper block body from coming loose.

[0016] In order to solve the above problems, the block according to the present invention comprises: A block used in a stopper block slip-out prevention structure in an attachment fixing structure for fixing an attachment to a forklift, the attachment having a vertical portion, upper and lower hooks provided on the vertical portion and engaged with an upper finger bar and a lower finger bar of the forklift, and a support portion protruding from the back surface of the vertical portion, The stopper block retaining structure is provided with a stopper block, The block is a block body having upper and lower surfaces extending horizontally and inserted from the left and right into a gap between the lower finger bar and the support portion; a first slide limiting portion that is fixed to either the left or right side surface of the block body, extends downward from the block body, and is adjacent to the support portion, thereby limiting the movement of the block body to either the left or right; a stopper block insertion portion having an insertion hole extending vertically and fixed to a side surface of the block body on the opposite side to the first slide limiting portion; a stopper fixed to both or either of a front surface and a rear surface of the stopper block insertion portion; The stopper block has a stopper block body, a swing member, and a shaft member, The stopper block body is a first locking portion having a first hole through which the shaft member passes in the front-rear direction and locked to the stopper block insertion portion; a second slide limiting portion extending continuously from the first engaging portion in the vertical direction, being inserted into the stopper block insertion portion, and being adjacent to the support portion to limit the movement of the block to either the left or right; The swing member is a connecting portion having a second hole at a base end through which the shaft member passes in the front-rear direction and connected to the stopper block via the shaft member so as to be swingable in the up-down direction; a second locking portion that is continuous with the tip of the connecting portion and that is partly disposed below the stopper when the second locking portion is swung downward together with the swinging member; After the stopper block is inserted into the stopper block insertion portion from above, the swinging member is swung downward so that a part of the second engaging portion is positioned below the stopper, thereby preventing the stopper block from coming off. Effect of the Invention

[0017] The stopper block retaining structure according to the present invention provides greater work efficiency than the prior art. [Brief description of the drawings]

[0018] [Figure 1] 1 is a perspective view showing a stopper block removal prevention structure according to an embodiment of the present invention; [Diagram 2] 11 is a rear view of the stopper block removal prevention structure showing the stopper block inserted. FIG. [Diagram 3] 1 is a side view of the stopper block removal prevention structure showing the stopper block being inserted. FIG. [Figure 4] 1 is a perspective view of the stopper block removal prevention structure showing the state where the stopper block is inserted. FIG. [Diagram 5]13 is a side view showing a modified example of the stopper block removal prevention structure of the present invention. FIG. [Figure 6] 13 is a side view showing another modified example of the stopper block removal prevention structure of the present invention. FIG. [Figure 7] 7 is a perspective view of the stopper block retaining structure shown in FIG. 6. FIG. [Figure 8] FIG. 1 is a side view showing conventional attachments, where A is a ram-type attachment and B is a fork-type attachment. [Figure 9] 1A, 1B, and 1C are side views showing the flow of conventional attachment and block arrangement, and 1D is an enlarged side view of the periphery of the block of 1C. [Figure 10] FIG. 11 is a perspective view showing a conventional stopper block retaining structure. [Figure 11] FIG. 11 is a perspective view of a conventional block and a stopper block as viewed from the right. [Figure 12] FIG. 13 is a perspective view showing a conventional stopper block retaining structure in the right fork-type attachment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a stopper block removal prevention structure of the present invention will be described with reference to the accompanying drawings.

[0020] Fig. 1 is a perspective view showing a stopper block retaining structure S according to one embodiment of the present invention. Fig. 2 is a rear view of the stopper block retaining structure S showing a state where a stopper block 3 is inserted, Fig. 3 is a side view thereof, and Fig. 4 is a perspective view thereof. As shown in Figs. 1 to 4, the stopper block retaining structure S includes a block 2, a stopper block 3, a swinging member 4, and a shaft member 5. Note that the stopper block retaining structure S described in this embodiment is structured on the assumption that the block 2 is inserted from left to right into the gap between the attachment 1 and the lower finger bar LF, so that in the case of a structure in which the block 2 is inserted from right to left into the gap, the left and right configuration is reversed.

[0021] The block 2 has a block body 20, a first slide limiting portion 21, a stopper block insertion portion 22, and a stopper 23.

[0022] The block body 20 is formed in a generally inverted L-shape when viewed from the right, and has an upper stage and a lower stage. The upper and lower surfaces of the lower stage extend horizontally. When the block body 20 is inserted into the gap between the vertical part 10 of the attachment, the lower finger bar LF, and the support part 14, like the conventional block body 20 shown in Fig. 10, the upper stage side is disposed between the back surface of the vertical part 10 of the attachment and the front surface of the lower finger bar LF, and the lower stage side is disposed between the lower finger bar LF and the support part 14.

[0023] The first slide limiting part 21 is fixed to the left side surface of the block body 20 and extends downward from the block body 20. When the block body 20 is inserted into the gap between the attachment and the lower finger bar LF, the lower part of the first slide limiting part 21 abuts against the left side surface of the support part 14, thereby restricting the movement of the block body 20 to the right.

[0024] 1, the stopper block insertion portion 22 has an insertion hole 22a that is U-shaped in a plan view and extends vertically. The stopper block insertion portion 22 is fixed to a side surface of the block body 20 on the opposite side to the first slide limiting portion 21 (the right side in this embodiment).

[0025] The stopper 23 is formed in a rectangular parallelepiped extending in the left-right direction, and is fixed to the front surface of the stopper block insertion portion 22. The tip of the stopper 23 protrudes to the right beyond the block body 20. The shape of the stopper 23 is merely an example, and is not limited thereto. In addition, the method of fixing the stopper 23 is not particularly limited and may be welding.

[0026] The stopper block 3 has a first locking portion 30 and a second slide limiting portion 32. The stopper block 3 corresponds to the "stopper block main body" of the present invention.

[0027] The first locking portion 30 extends from its base end to the right of the stopper block insertion portion 22 and has a first hole 30a at its tip. In this embodiment, the first locking portion 30 is formed in a U-shape when viewed from above, but this is merely an example and is not limited to this. The first locking portion 30 is configured to be locked to the upper surface of the stopper block insertion portion 22 when a second slide limiting portion 32, which will be described next, is inserted into the insertion hole 22a.

[0028] As shown in Fig. 1, the second slide limiting portion 32 is formed in a rectangular parallelepiped extending continuously downward from the base end of the first locking portion 30. As shown in Figs. 2 to 4, when the second slide limiting portion 32 is inserted into the stopper block insertion portion 22, its tip is disposed below the block main body 20 and adjacent to the right side surface of the support portion 14, thereby restricting the leftward movement of the block main body 20. The shape of the second slide limiting portion 32 is not particularly limited.

[0029] The swing member 4 has a connecting portion 40 and a second locking portion 42.

[0030] As shown in FIG. 1, the connecting portion 40 extends in the left-right direction and has a second hole 40a (see FIG. 2) at its tip. The tip of the connecting portion 40 is disposed between the U-shaped first locking portions 30 and is swingably connected to the first locking portions 30 via a shaft member 5 that passes through the first hole 30a and the second hole 40a. The shape of the connecting portion 40 is merely an example, and may be formed in a U-shape and connected to the tip of the first locking portion 30. In this case, the first locking portion 30 may be formed in a rectangular parallelepiped rather than a U-shape, disposed between the connecting portions 40 formed in a U-shape, and connected by the shaft member 5.

[0031] The second locking portion 42 is formed in a substantially rectangular parallelepiped shape that continues from the base end of the connecting portion 40 and extends forward of the stopper block 3 .

[0032] 2 to 4, when the stopper block 3 is inserted into the stopper block insertion portion 22, the swinging member 4 is swung downward so that the tip of the second locking portion 42 is positioned adjacent to and below the tip of the stopper 23. In this way, the swinging member 4 restricts the upward movement of the stopper block 3 and prevents the stopper block 3 from coming off. Furthermore, when the stopper block 3 is pulled out, the swinging member 4 is swung upward to release the stopper block 3 from coming off.

[0033] As described above, the stopper block retaining structure S can prevent the stopper block 3 from falling off simply by swinging the swing member 4 downward, and can release the retention of the stopper block 3 simply by swinging the swing member 4 upward. Therefore, the stopper block retaining structure S has better work efficiency than conventional products. In addition, the stopper block retaining structure S does not require the spring plunger SP and the fixing pin FP, so there is no risk of losing them, and not using the spring plunger SP reduces the risk of failure or sticking. Furthermore, the stopper block retaining structure S can reuse the conventional block 2 by attaching the stopper 23 to the conventional block 2, and there is no need to modify the attachment, the lower finger bar LF, etc.

[0034] Although one embodiment of the stopper block retaining structure of the present invention has been described above, the present invention is not limited to the above embodiment. For example, the stopper block retaining structure of the present invention may be implemented by appropriately combining the following modified examples.

[0035] <Modification>

[0036] As shown in FIG. 5, the stopper block anti-slip structure S may be configured such that two stoppers 23 are fixed to the front and rear surfaces of the block body 20, and the second engagement portion 42 is formed in an inverted T-shape in side view with both ends positioned on the undersides of the two stoppers 23, respectively.

[0037] 6 and 7, the stopper 23 may be configured to be shorter in the left-right direction than in the above-described embodiment, and the second locking portion 42 may be provided with a portion at its tip that further extends in the left-right direction, thereby locking the portion to the stopper 23 and preventing the stopper block 3 from coming off. In other words, the shapes of the second locking portion 42 and the stopper 23 are not particularly limited in the stopper block fall-off prevention structure S, as long as the swing member 4 swings downward to position the second locking portion 42 below the stopper 23 or the second locking portion 42 is locked to the stopper 23 to prevent the stopper block 3 from coming off. [Explanation of symbols]

[0038] S Stopper block retaining structure UF Upper Finger Bar LF Lower Finger Bar FP fixed pin SP Spring Plunger BS Cylinder bracket stopper 1 Attachment 10 Vertical section 11 Top Hook 12 Bottom Hook 13 Cylinder bracket 14 Support part 2 Blocks 20 Block body 21 First slide limiting section 22 Stopper block insertion part 22a Insertion hole 23 Stopper 3 Stopper block (stopper block body) 30 First locking portion 30a 1st hole 32 Second slide limiting section 4 Swinging member 40 Connection part 40a 2nd hole 42 Second locking portion 5 Shaft member

Claims

1. A stopper block retaining structure for an attachment fixing structure for fixing an attachment to a forklift, the attachment having a vertical portion, upper and lower hooks provided on the vertical portion and engaged with an upper finger bar and a lower finger bar of the forklift, and a support portion protruding from a back surface of the vertical portion, a block, a stopper block, a swing member, and a shaft member, The block comprises: a block body having upper and lower surfaces extending horizontally, the block body being inserted from the left and right into a gap between the lower finger bar and the support portion; a first slide limiting portion that is fixed to either a left or right side surface of the block body, extends downward from the block body, and is adjacent to the support portion, thereby limiting the movement of the block body to either the left or right; a stopper block insertion portion having an insertion hole extending vertically and fixed to a side surface of the block body on the opposite side to the first slide limiting portion; a stopper fixed to both or either of a front surface and a rear surface of the stopper block insertion portion; The stopper block is a first locking portion having a first hole through which the shaft member passes in a front-rear direction and locked to the stopper block insertion portion; a second slide limiting portion extending continuously from the first engaging portion in the up-down direction, being inserted into the stopper block inserting portion, and being adjacent to the support portion to limit the movement of the block to either the left or right, The rocking member is a connecting portion having a second hole at a base end through which the shaft member passes in a front-rear direction and connected to the stopper block via the shaft member so as to be swingable in a vertical direction; a second engaging portion that is continuous with the tip of the connecting portion and that is partly disposed below the stopper when the second engaging portion is swung downward together with the connecting portion, A stopper block anti-slip structure in which, after the stopper block is inserted into the stopper block insertion portion from above, the oscillating member is swung downward and a portion of the second engaging portion is positioned below the stopper, thereby preventing the stopper block from coming off.

2. 2. The stopper block removal prevention structure according to claim 1, wherein a tip of the stopper protrudes in the left-right direction beyond the block body.

3. 3. The stopper block removal prevention structure according to claim 2, wherein the pivoting member is substantially L-shaped or inverted L-shaped.

4. The stoppers are disposed on both the front and rear surfaces of the stopper block insertion portion, 3. The stopper block retaining structure according to claim 2, wherein said pivot member is formed substantially in an inverted T-shape.

5. A stopper block used in a stopper block slip-out prevention structure in an attachment fixing structure for fixing an attachment to a forklift, the attachment having a vertical portion, upper and lower hooks that are provided on the vertical portion and are engaged with an upper finger bar and a lower finger bar of the forklift, and a support portion that protrudes from a back surface of the vertical portion, The stopper block retaining structure includes a block, The block comprises: a block body having upper and lower surfaces extending horizontally, the block body being inserted from the left and right into a gap between the lower finger bar and the support portion; a first slide limiting portion that is fixed to either a left or right side surface of the block body, extends downward from the block body, and is adjacent to the support portion, thereby limiting the movement of the block body to either the left or right; a stopper block insertion portion having an insertion hole extending vertically and fixed to a side surface of the block body on the opposite side to the first slide limiting portion; a stopper fixed to both or either of a front surface and a rear surface of the stopper block insertion portion; The stopper block includes a stopper block body, a swing member, and a shaft member. The stopper block body is a first locking portion having a first hole through which the shaft member passes in a front-rear direction and locked to the stopper block insertion portion; a second slide limiting portion extending continuously from the first engaging portion in the up-down direction, being inserted into the stopper block inserting portion, and being adjacent to the support portion to limit the movement of the block to either the left or right, The rocking member is a connecting portion having a second hole at a base end through which the shaft member passes in a front-rear direction and connected to the stopper block body via the shaft member so as to be swingable in a vertical direction; a second engaging portion that is continuous with the tip of the connecting portion and that is partly disposed below the stopper when the second engaging portion is swung downward together with the swinging member, A stopper block in which after the stopper block body is inserted from above into the stopper block insertion portion, the oscillating member is swung downward and a portion of the second engaging portion is positioned below the stopper, thereby preventing the stopper block body from coming loose.

6. A block used in a stopper block slip-out prevention structure in an attachment fixing structure for fixing an attachment to a forklift, the attachment having a vertical portion, upper and lower hooks provided on the vertical portion and engaged with an upper finger bar and a lower finger bar of the forklift, and a support portion protruding from a back surface of the vertical portion, The stopper block retaining structure includes a stopper block, The block comprises: a block body having upper and lower surfaces extending horizontally, the block body being inserted from the left and right into a gap between the lower finger bar and the support portion; a first slide limiting portion that is fixed to either a left or right side surface of the block body, extends downward from the block body, and is adjacent to the support portion, thereby limiting the movement of the block body to either the left or right; a stopper block insertion portion having an insertion hole extending vertically and fixed to a side surface of the block body on the opposite side to the first slide limiting portion; a stopper fixed to both or either of a front surface and a rear surface of the stopper block insertion portion; The stopper block includes a stopper block body, a swing member, and a shaft member. The stopper block body is a first locking portion having a first hole through which the shaft member passes in a front-rear direction and locked to the stopper block insertion portion; a second slide limiting portion extending continuously from the first engaging portion in the up-down direction, being inserted into the stopper block inserting portion, and being adjacent to the support portion to limit the movement of the block to either the left or right, The rocking member is a connecting portion having a second hole at a base end through which the shaft member passes in a front-rear direction and connected to the stopper block via the shaft member so as to be swingable in a vertical direction; a second engaging portion that is continuous with the tip of the connecting portion and that is partly disposed below the stopper when the second engaging portion is swung downward together with the swinging member, After the stopper block is inserted from above into the stopper block insertion portion, the swinging member is swung downward and a portion of the second engaging portion is positioned below the stopper, thereby preventing the stopper block from coming loose.

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