JP3232838B2 - Fork mounting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a fork mounting structure fastening engineering tool is provided which can be fixed to a working position to perform tightening operations such as bolts and nuts.

[0002]

2. Description of the Related Art Conventionally, a mast provided on a forklift is provided with a lift bracket that moves up and down along the mast. On the front of this lift bracket,
As shown in FIG. 9, a fork bar 51 is fixed. A fork 52 is detachably hooked to the front surface of the fork bar 51 via a substantially L-shaped upper hook (not shown) and a lower hook 53 formed on the rear surface of the vertical portion. At this time, a gap E is formed between the fork bar 51 and the lower hook 53.

Further, a stopper bolt 54 is screwed into the lower hook 53, and the tip of the stopper bolt 54 contacts the fork bar 51, thereby preventing rattling due to the gap E. At this time, a lock nut 55 is screwed into the stopper bolt 54, and the stopper bolt 54 is locked by tightening the lock nut 55.

However, in order to tighten the lock nut 55, a special tool (for example, a tightening handle) is required.
You need to use Therefore, there is a problem that a storage place for storing the fastening handle needs to be set in a vehicle or the like, and that the fastening handle needs to be taken in and out of the storage place every time fastening work is performed. Therefore, there is a problem that the tightening handle is lost when the tightening operation is performed, such as going to the storage place and the like, and the tightening handle is lost.

Therefore, as shown in FIG. 10, a tightening handle 56 is inserted into the stopper bolt 54 in advance and disposed between the lower hook 53 and the head 54a of the stopper bolt 54. When the operator tightens the lock nut 55, it is not necessary to go to the storage place to take the tightening handle 56, so that the tightening operation of the tightening handle 56 can be performed easily.

[0006]

However, since the forklift travels with the fastening handle 56 inserted through the stopper bolt 54, the fastening handle 56 swings between the stopper bolts 54. For this reason, the fastening handle 56 collides with the stopper bolt 54, the lock nut 55, and the like, generating an abnormal noise, and there is a problem that the user cannot concentrate on work such as driving.

Further, when there is an obstacle on the ground or the like when the fork 52 is raised or lowered, the grip portion 56a of the tightening handle 56 collides with the obstacle, and the grip portion 56a is bent or damaged. There is a problem of doing.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to securely fix a tightening tool for tightening a screw member to a work place where a tightening operation is performed. and to provide a mounting structure of that full forks.

[0009]

[0010]

Means for Solving the Problems To solve the above problems,
Therefore, the invention according to claim 1 is provided on the back of the vertical portion of the fork,
A lower hook for detachably hooking the fork to the fork bar is provided. The lower hook has a tip for abutting against a back surface of the fork bar to prevent rattling of the fork and a stopper bolt for locking the stopper bolt. In a fork mounting structure provided with a lock nut, an engaging portion is formed on the head of the stopper bolt, and a fixing member is attached to a grip portion of a tightening tool for tightening the lock nut, and the fixing member An engaging portion that can be engaged with the engaging portion of the stopper bolt is formed at the distal end portion, and the fastening tool can be fixed to the stopper bolt by engaging these fixing members and the engaging portions of the stopper bolt with each other. The gist is that what was done.

[0011]

[0012]

Therefore, according to the first aspect of the invention, tightening tool for tightening a lock nut provided on the stopper bolt is fixed by the engaging portion of the fixing member and the stopper bolt engaged with each other . Therefore, when the operator tightens the lock nut, the lock nut is tightened by the tightening tool by releasing the engagement. Then, in order to fix the tightening tool to the stopper bolt, the fixing tool is fixed by engaging an engaging portion between the fixing member and the stopper bolt.

Further, since the fastening tool is fixed to the stopper bolt, the shaking of the fastening tool during traveling of the forklift is prevented, and the forklift travels in a stable state.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will now be described with reference to FIGS.
This will be described with reference to FIG. As shown in FIG. 1, a mast 1 provided on a forklift is provided with a lift bracket 3 that moves up and down via a lift roller 2 that rolls along the mast 1. A pair of upper and lower fork bars 4 is fixed to the front surface of the lift bracket 3, and a pair of left and right forks 5 are formed on the vertical portion of the back surface of the fork bar 4.
And the lower hook 7 is detachably hooked.

A positioning stopper pin 8 urged downward by a spring (not shown) on the upper hook 6 engages with an engagement notch 9 formed along the upper edge of the upper fork bar 4. The movement of the fork 5 in the left-right direction is restricted. Therefore, with the stopper pin 8 pulled out upward, the fork 5 is moved in the left-right direction according to the size of the luggage to be handled, and the interval between the forks 5 is adjusted. or,
A gap E is formed between the engagement surfaces of the lower fork bar 4 and the lower hook 7.

As shown in FIGS. 2, 6 (a) and 6 (b),
A screw hole 10 in which a female screw is formed is formed in the lower hook 7. The screw hole 10 has a stopper bolt 11
Is screwed.

The stopper bolt 11 has a substantially circular head 12 at the base end thereof. The outer peripheral surface of the head 12 is provided with a knurl 12a and a pair of notched surfaces 12b formed by notching both sides thereof. An annular engagement recess 1 is provided on the outer surface of the head 12.
3 are formed, and the cross-sectional shape of the engaging recess 13 is a semicircle. Further, a hexagonal square shaft portion 14 is formed inside the head portion 12. The stopper bolt 11 is formed with a screw shaft portion 15 extending from the square shaft portion 14 in the distal direction. A pin 1 is attached to the tip of the screw shaft 15.
6 are formed.

That is, the stopper bolt 11 is tightened by turning the head 12 with fingers while the screw shaft 15 is screwed into the screw hole 10. At this time, the pin portion 16 is in contact with the back slope 4a of the fork bar 4 at a right angle, and the gap E between the lower hook 3 and the fork bar 4 is substantially zero. Therefore, rattling between the fork bar 4 and the lower hook 7 caused by the gap E is prevented.

Furthermore, the screw shaft 15 of the stopper bolt 11
, A lock nut 17 having a hexagonal outer shape is screwed into the lower hook 7. Then, by tightening the lock nut 17 to the lower hook 7, the stopper bolt 11 is locked, and the contact state between the stopper bolt 11 and the back slope 4a is reliably maintained.

As shown in FIGS. 2, 4 (a) and 4 (b),
A tightening handle 18 for tightening the lock nut 17 is provided between the head 12 of the stopper bolt 11 and the lower hook 7. This fastening handle 18
Is provided with a resin fixing plate 19 for fixing the tightening handle 18 to the stopper bolt 11.

The tightening handle 18 is formed of a flat plate bent in the longitudinal direction, and has a substantially circular engagement hole 20 formed at the tip thereof. Twelve identically-shaped engagement corner portions 20a are formed on the inner peripheral surface of the engagement hole 20 at equal intervals.

The clamping handle 18 has a grip 21 extending linearly toward the base end. The grip 21 has a rectangular cross section. Further, an engagement portion 22 is formed at a base end of the grip portion 21.

The engaging portion 22 has a rectangular cross section and is tapered toward the base end. The width of the most tapered portion located at the base end is formed smaller than the width of the grip 21.
The width of the thickest portion on the tip end side of the engaging portion 22 is formed to be larger than the width of the grip portion 21 to form the engaging step portion 22a.

As shown in FIGS. 4 and 5, the fixing plate 19 is composed of a fixing portion 23 and a substantially U-shaped mounting portion 24. A substantially rectangular insertion hole 25 is formed by the portion 24. The attachment portion 24 is formed with a substantially U-shaped notch groove 24a.

The fixing portion 23 has a base portion 26 on which the attachment portion 24 is formed, an intermediate portion 27 bent from the base portion 26 to the front side, and a distal end slightly bent from the intermediate portion 27 to the back side. And a section 28. A reinforcing rib 29 is formed on the surface of the fixed portion 23 from the distal end portion 28 to the base end portion 26 via the intermediate portion 27. Furthermore, an elongated slit 30 extending in the longitudinal direction is formed at a substantially central portion of the base end portion 26. A substantially semicircular engaging projection 31 is formed on the back surface of the tip portion 28.

The fixing plate 19 is attached to the tightening handle 18 by inserting the engaging portion 22 of the tightening handle 18 from the distal end side of the insertion hole 25. That is, the engaging portion 22 is formed so that its width gradually increases from the base end side to the distal end side.
5, the engaging portion 22 gradually presses the inner peripheral surface of the insertion hole 25 in the width direction. At this time,
The base end side of the attachment portion 24 and the base end portion 26 is gradually expanded by the notch groove 24 a and the slit 30 based on the pressing. When the engaging portion 22 passes through the insertion hole 25, the fixing plate 19 is
And the attachment portion 24 and the base end portion 26 are closed.

This fixing plate 19 serves as a fastening handle 18.
In the state where the fixing plate 19 is attached to the
, But cannot be removed from the fastening handle 18 by the engaging step 22a of the engaging portion 22.

The fastening handle 18 to which the fixing plate 19 has been attached as described above, together with the lock nut 17 in advance, has its engaging hole 20 inserted into the screw shaft portion 1 of the stopper bolt 11.
5, the stopper bolt 11 is attached by screwing the stopper bolt 11 into the lower hook 6.

In this state, the worker turns the head 12 to bring the pin 16 into contact. Then, the engaging corner 20a of the engaging hole 20 of the tightening handle 18 is
7, the tightening handle 18 is rotated, the lock nut 17 is tightened to the lower hook 6, and the stopper bolt 11 is locked. After completion of the tightening operation, the engaging hole 20 of the tightening handle 18 is inserted into the square shaft portion 14 of the stopper bolt 11, and the engaging corner portion 20a is engaged with the corner portion.

Then, as shown in FIG. 2, the engaging projection 31 of the fixing plate 19 is
3 to be engaged with the tightening handle 18.
Is fixed. In FIG. 2, the fastening handle 18 is fixed such that the grip portion 21 faces downward.

Also, the tightening handle 18 is provided with the stopper bolt 1
1 is not fixed to the tightening handle 1
8 can be rotated about the stopper bolt 11. Therefore, the fastening handle 18 can be appropriately rotated to fix the grip 21 toward a desired rotation position (horizontal direction, upward, etc.). For example, as shown in FIG. 3, by fixing the tightening handle 18 so that the grip portion 21 faces in the horizontal direction, when the fork 5 moves up and down, interference between the obstacle on the ground or the like and the grip portion 21 is prevented. Can be prevented. The same is true for the case of facing upward.

Therefore, according to the present embodiment, the fastening handle 18 is fixed to the stopper bolt 11 using the fixing plate 19.
, The fastening handle 18 can be installed at a place where the fastening operation is performed in a stable state without swinging to the stopper bolt 11.

Furthermore, since the shaking of the tightening handle 18 is prevented, abnormal noise generated when the tightening handle 18 collides with the stopper bolt 11, the lock nut 17, or the like during traveling of the forklift can be prevented. .

The tightening handle 18 has a grip 21
Can be fixed while being positioned at a desired angle around the stopper bolt 11. In this case, by fixing the grip portion 21 of the tightening handle 18 in a horizontal, upward or obliquely upward direction, interference between the grip portion 21 and an obstacle on the ground, for example, when the fork 5 moves up and down is prevented. can do. Therefore, it is possible to prevent the grip portion 21 from being bent or damaged.

Further, a fixing plate 19 is provided slidably with respect to the tightening handle 18. Accordingly, the fixing plate 19 can be easily engaged with or released from the stopper bolt 11 simply by moving the fixing plate 19 with respect to the tightening handle 18 without particularly moving the position of the clamping handle 18. It is possible to do.
For this reason, the workability of the operation of fixing the fastening handle 18 to the fixing plate 19 can be improved.

The fixing plate 19 is formed of resin and has a slit 30 and a cutout groove 24a formed at the base end thereof, so that the base end has elasticity. Therefore, the fixing plate 19 can be easily attached to the tightening handle 18 simply by inserting the engaging portion 20 of the tightening handle 18 into the insertion hole 25 from the distal end side.

In addition, since the outer peripheral surface of the stopper bolt 11 is provided with the knurl 12a, the stopper bolt 11 can be easily rotated by a finger or the like. Furthermore, since the notch surface 12b is formed on the outer peripheral surface of the stopper bolt 11, assembly by an impact wrench can be performed.

The present invention is not limited to the above-described embodiment, and can be implemented as follows, with a part of the configuration appropriately changed without departing from the spirit of the invention. (1) In the above embodiment, the fastening handle 18 is fixed to the stopper bolt 11, but may be fixed to the lock nut 17. That is, similarly to the case where the lock nut 17 is fixed to the stopper bolt 11, an engagement recess is provided in the lock nut 17, and the engagement recess of the lock nut 17 and the engagement protrusion 31 of the fixing plate 19 are provided.
The fastening handle 18 is fixed to the lock nut 17 by engaging.

(2) In the above embodiment, the stopper bolt 1
1 is provided with an engaging concave portion 13 and a fixing plate 19 is provided with an engaging convex portion 31.
However, the engaging protrusion may be formed on the stopper bolt 11 and the engaging recess may be formed on the fixing plate 19.

(3) In the above embodiment, as shown in FIG. 7, the attachment portion 24 of the fixing plate 19 may be provided so as to be openable and closable. In this case, the fastening handle 18 is disposed in the open state shown in FIG. 7, and the mounting portion 24 is turned to the closed state by rotating, and the projection 32 of the mounting portion 24 and the groove 33 are engaged. , The fixing plate 19 is the fastening handle 1
Attach to 8.

(4) In the above embodiment, instead of the circular engaging hole 20, a semicircular engaging hole having an open end may be formed in the tightening handle 18. An engagement corner 20a is formed on the inner surface of the engagement hole as in the case of the engagement hole 20.

(5) In the above embodiment, the fastening handle 18 is engaged with the square shaft portion 14 of the stopper bolt 11 to
The stopper bolt 11 may be tightened by rotating the square shaft portion 14 with the tightening handle 18. Alternatively, a stopper bolt having a hexagonal head portion 12 of the stopper bolt 11 may be used.

Further, the present invention may be applied to a tightening handle 18 having an appropriate shape according to the shape of the screw member. For example, the fastening handle 18 for fastening a square screw member may be applied to a fastening handle 18 having a square shape of the engagement hole 20. Similarly, the present invention may be applied to a tightening handle 18 having engagement holes 20 of various polygonal shapes depending on the shape of the screw member.

(6) In the above embodiment, it is not necessary to provide the stopper bolt 11 particularly with the square shaft portion 14. (7) In the above embodiment, as shown in FIGS. 8A and 8B, a plurality of hemispherical engaging recesses 34 may be formed at a predetermined pitch in the head 12 of the stopper bolt 11. In this case, a hemispherical engaging projection 35 is formed on the fixing plate 19. Then, the engaging plate 34 is fixed to the stopper bolt 11 by engaging the engaging concave portion 34 with the engaging convex portion 35.

[0045]

As described above, according to the first aspect of the present invention, since the tightening tool is fixed to the stopper bolt, the shaking of the tightening tool during traveling of the forklift can be prevented. It is possible to prevent noise or the like caused by shaking of the tool.

[Brief description of the drawings]

FIG. 1 is a side view showing a mounting structure of a fork in a forklift according to an embodiment of the present invention.

FIG. 2 is a side view showing a state in which a tightening handle is fixed to a stopper bolt attached to a lower hook using a fixing plate in one embodiment.

FIG. 3 is a rear view showing a state in which a tightening handle is fixed to a stopper bolt attached to a lower hook using a fixing plate in one embodiment.

FIG. 4A is a side view showing a fastening handle to which a fixing plate is attached, and FIG. 4B is a front view thereof.

FIG. 5A is a rear view showing a fixing plate,
(B) is a bottom view.

FIG. 6A is a perspective view showing a stopper bolt, and FIG. 6B is a partially cutaway sectional view showing the vicinity of a head thereof.

FIG. 7 is a perspective view showing a fixing plate in another example.

8A is a rear view showing a fixing plate in another example, and FIG. 8B is a plan view showing a head of a stopper bolt.

FIG. 9 is a side view showing a fork mounting structure in a conventional example.

FIG. 10 is a side view showing a fork mounting structure in a conventional example.

[Explanation of symbols]

4 ... fork bar, 5 ... fork, 7 ... lower hook, 1
1 ... stopper bolt as screw member, 12 ... head, 1
Reference numerals 3, 34: engaging recesses as engaging portions, 17: lock nuts as screw members, 18: tightening handles as tightening tools, 19: fixing plates as fixing members, 21: gripping portions, 28: fixing Tip portions of the plate, 31, 35... Engagement protrusions as engagement portions.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B66F 9/12 B25B 23/10

Claims (1)

(57) [Claims] A fork is provided on the back of a vertical portion of the fork.
Hook for detachably hooking the to the fork bar
The lower hook has a tip on the back of the fork bar.
To prevent rattling of the fork by contacting the
To lock the topper bolt and the stopper bolt
In the fork mounting structure provided with a lock nut, an engaging portion is formed on a head of the stopper bolt,
Fixed part on the gripping part of the tightening tool to tighten the nut
Attach the material and strike the end of the fixing member.
Forming an engaging portion engageable with the engaging portion of the pad bolt;
Lock member and stopper bolt engage each other
To secure the tightening tool to the stopper bolt.
Fork mounting structure made possible.