JPH0533516Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention relates to a fork mounting structure for a forklift, in which the position and spacing of the forks can be adjusted by manually sliding the forks against the finger bar. .

BACKGROUND ART As shown in FIG. 8, a forklift 11 has a mast 13 in front of a driving section 12, and is guided by the mast 13 to move up and down. a pair of left and right forks 17 which are held in the direction and are engaged and held between the finger bars 15 and 16;
, each can be freely slid in the left and right directions. As shown in FIGS. 9 and 10, the fork 17 is integrally formed in an L shape by a rising portion 17a and a horizontal plate portion 17b, and has a downwardly directed upper engagement piece 18 at the upper end of the back surface of the rising portion 17a. , has an upwardly directed lower engagement piece 19 at the lower part of the back surface.

In the conventional format as above, finger bar 1
Since the upper engaging piece 18 is completely engaged with the fork 5, sliding (movement) of the fork 17 is heavy and cannot be performed simply and easily. Further, in the lower part, the engagement type is such that a gap 20 is created between the back surface of the rising portion 17a and the front surface of the lower finger bar 16, so that vibrations when the forklift 11 is traveling can cause the lower finger bar 16 to There was a problem in that the rising portion 17a collided, and the impact sound caused by this repetition was unexpectedly loud and noisy.

Therefore, in the past, for example,
No. 77170 and Japanese Unexamined Patent Publication No. 57-72597 propose countermeasures against impact noise. Additionally, Japanese Patent Laid-Open No. 52-69150 discloses a countermeasure against slides.

Problems that the invention aims to solve Although conventional measures against impact noise can be taken against rattling, there is a lack of consideration for sliding, and when installing an elastic body on the finger bar side as in the former case, the fork slide There was a problem in that it had to be installed over the entire width of the stroke and a lot of local wear occurred.

In addition, for slides, a cylinder device is used to automatically slide with a large push/pull force, and it is well known that such a sliding part is provided with a sliding body with a small friction coefficient, so that a large push/pull force cannot be obtained. It would have been difficult to adopt the manual method, which was not available.

The present invention solves the above problems, eliminates the need for local wear and extensive installation of elastic bodies, prevents the generation of impact noise, and allows the fork to slide easily even with a small manual push/pull force. The purpose is to provide a fork mounting structure for a forklift that is possible.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides an upper engaged part of a protrusion that projects upward, an upper finger bar that projects rearward and whose upper surface is formed as a receiving part, and a lower A lower finger bar having a lower engaged portion of a protrusion projecting from the upper finger bar is provided on the back crest, and an upper finger bar that slidably engages with the upper engaged portion of the upper finger bar is provided on the back of the rising portion of the proximal end of the fork. An upper engaging piece having a notch portion and a contact portion facing the receiving portion, and a lower engaging piece having a lower notch portion that slidably engages a lower engaged portion of the lower finger bar. In the fork attachment part, the upper elastic part is compressed by the load applied to the fork and deepens the biting of the upper notch part into the upper engaged part in the abutting part of the upper engaging piece that comes into contact with the receiving part of the upper finger bar. A lower elastic member is provided at a position opposite to the lower finger bar on the back side of the rising portion of the fork.

Effect In the above configuration, when the fork is unloaded, its own weight in the downward direction when standing up and a moment that rotates the fork tip downward using the upper part of the lower finger bar as a fulcrum are generated, and these loads and moments are combined with the upper engagement force. It works in the direction of biting the notch part of the piece into the upper engaged part of the upper finger bar. However, the elastic repulsive force of the upper elastic member pushes the upper engaging piece upward against the downward self-weight, and furthermore, the elastic repulsive force of the lower elastic member counteracts and cancels out the moment, so that the upper engaging piece of the notch This prevents the fork from being caught in the engaged portion, and allows the fork to easily slide along both finger bars even with a small manual force. Furthermore, since both elastic members are attached to the fork side, the attachment surface can be made small, and since the entire surface is always in contact, local wear does not occur. Furthermore, the lower elastic member can also prevent impact noise from occurring.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

Reference numeral 1 designates an upper finger bar disposed on the back crest, the upper edge of which forms an upper engaging portion 1a of a protrusion that projects upward, and the intermediate portion of the back side of which protrudes rearward so that the upper surface serves as an upper receiving portion 1b. It is formed into a step-like shape. Reference numeral 2 denotes a lower finger bar disposed on the back crest, the lower edge of which forms a protruding lower engaging portion 2a that projects downward, and the intermediate portion of the back side that projects rearward, with the lower surface forming a lower receiving portion 2b.
It is formed in a step-like manner. 3 is a fork formed into an L shape by a rising part 3a and a horizontal plate part 3b,
An upper engaged piece 4 is provided at the upper end of the back surface of the rising portion 3a, and a lower engaging piece 5 is provided at the lower portion of the back surface of the rising portion 3a. The upper engagement piece 4 has an upper notch 4b formed on the rising portion 3a side, into which the upper engaged portion 1a of the upper finger bar 1 is slidably engaged, and a backrest side that contacts the upper receiving portion 1b. An upper elastic member 6, which is an example of an elastic member and is made of resin and has elasticity and low slip resistance, is attached to the upper abutting portion 4a on the lower surface. This attachment is done by gluing, bolting, etc. Further, the lower engaging piece 5 has a lower notch 5b formed on the rising portion 3a side, into which the lower engaged portion 2a of the lower finger bar 2 is slidably engaged, and comes into contact with the lower receiving portion 2b. Lower abutment part 5 on the lower surface of the backrest side
a is formed. 7 is a portion to be transported.

Reference numeral 8 denotes a rectangular plate-shaped elastic member 8 attached to the rear side of the rising portion 3a and at a position opposite to the lower finger bar 2. The elastic member 8 is made of hard rubber, resin, etc., and is highly wear-resistant and hard. Ru. The elastic member 8 is fitted into a recess 9 formed in the rising portion 3a and fixed by adhesive or the like, and is designed to protrude slightly from the back surface of the rising portion 3a.

In the above embodiment, the upper cutout portion 4 of the upper engaging piece 4 is provided in the upper engaged portion 1a of the upper finger bar 1.
a, and then insert the lower notch 5b of the lower engaging piece 5 into the lower engaged portion 2a of the lower finger bar 2.
When the conveyed object 7 is not supported in the state of use in which the upper elastic member 6 is engaged, the upper engaging piece 1a is moved toward the upper engaged portion 1a by the bulge caused by the elastic repulsion of the upper elastic member 6, as shown in FIG. 4 Upper notch 4
b can be loosened. Further, the fork 3 is lifted by the amount of bulge (looseness), and as a result, the lower engaging piece 5 is tightly fitted into the lower engaged portion 2a with a loose touch, and the lower finger bar 2 and No gap is generated between the lower engagement piece 5 and the lower engagement piece 5. The fork 3 can be lightly and easily slid in the lateral direction by the above-mentioned loose bite on the upper side and gentle touch on the lower side. Furthermore, since there are no gaps, collisions and noise caused by vibrations during driving do not occur. Furthermore, the bulge due to the elastic repulsion of the lower elastic member 8 can absorb the gap generated between the rising portion 3a and the lower finger bar 2, and also provides a buffering effect, thereby preventing the gap between the rising portion 3a and the lower finger bar 2. No collision occurs. Furthermore, due to the bulge, the fork 3 is lifted up a little, and the upper engaged portion 1a
The engagement of the upper engaging piece 4 against the upper engaging piece 4 can be further loosened.

That is, as shown in FIG. 4, the center of gravity G of the fork 3 is on the side of the rising portion 3a of the horizontal plate portion 3b, and the entire weight W of the fork 3 generates a moment M with the fulcrum near the upper part of the lower engagement piece 5. As a result of this M and the downward weight W ₁ of the rising portion 3a, the upper engaging piece 4 bites into the upper finger bar 1, and the moment M presses the rising portion 3a against the lower finger bar 2. There is.

(In the past, manual sliding was extremely difficult due to the moment M, and as a countermeasure, the tip of the fork 3 was lifted F to cancel out the moment M, and then slid.) In the above embodiment, the lower elastic member 8 elastic repulsive force of
While resisting the moment M by E ₂ ,
The elastic repulsive force E ₁ of the upper elastic member 6 counteracts the own weight W ₁ and exerts the same effect as the force F that lifts the tip of the fork 3. Thereby, the fork 3 can be easily slid along the upper and lower finger bars 1 and 2.

Note that by using resin or the like with a small coefficient of friction for the lower elastic member 8, sliding can be performed more easily.

On the other hand, when the conveyed object 7 is supported as shown in FIG. 3, the upper elastic member 6 is compressively deformed by the load, and the upper engaging piece 4 is completely moved against the resin engaged portion 1a. Moreover, since the fork 3 is sufficiently bitten and the rising portion 3a comes into pressure contact with the front surface of the lower finger bar 2 due to the load, the fork 3 can be stably supported and conveyed without wobbling. Further, the lower elastic member 8 is compressively deformed, and the rising portion 3a
The back surface of the fork 3 comes into direct contact with the front surface of the lower finger bar 2, and the fork 3 can be stably supported and conveyed without wobbling.

The lower elastic member 8 may have a protrusion 10 for preventing falling off as shown in FIG.
Various shapes can be adopted, such as a round shape as shown in the figure, and a round shape with protrusions 10 as shown in FIG.

Effects of the invention As described above, according to the invention, the upper engaging piece, which is directly subjected to the load on the fork, is compressed by the load applied to the fork in the receiving part that does not directly engage with the upper engaged part. By providing an upper elastic member that deepens the engagement of the upper notch with the upper engaged portion, when the fork is unloaded (empty), the upper engagement of the fork is caused by the bulge caused by the elastic repulsion of the upper elastic member. By pushing up the piece, the upper notch of the upper engaging piece is loosened from biting into the upper engaged part, and combined with the effect of the lower elastic member, it is extremely easy to move the fork along the finger bar even manually. It can be slid (interval adjustment). Further, the lower elastic member can absorb the gap between the rising portion of the fork and the lower finger bar, and can prevent noise caused by collision between the two. Furthermore, when the object to be transported is supported, the upper elastic member is compressed, the notch of the upper engaging piece fully engages the upper engaged part, and the rising part is pressed against the front surface of the lower finger bar, resulting in a stable state. Transportation becomes possible. Furthermore, since both elastic members are provided on the rising part of the fork side and the contact part of the upper engagement piece, a smaller mounting surface is required compared to mounting on the finger bar side, and since the entire surface is always in contact, uneven wear occurs. do not.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the present invention, in which FIG. 1 is a perspective view, FIGS. 2 and 3 are side views of the installed state, and FIG. 4 is a side view illustrating load application. Fifth
7 to 7 are perspective views of modified examples of the lower elastic member, FIG. 8 is a perspective view showing a conventional example, and FIGS. 9 and 10 are side views of the same. 1...Upper finger bar, 1a...Upper engaged part, 1b...Upper receiving part, 2...Lower finger bar, 2a...Lower engaged part, 2b...Lower receiving part, 3...Fork , 3a...rising portion, 3b
...Horizontal plate part, 4...Upper engagement piece, 4a...Upper contact part, 4b...Upper notch, 5...Lower engagement piece,
5a... lower abutment part, 5b... lower notch part, 6...
. . . Upper elastic member, 7. Object to be transported, 8. Lower elastic member, 9. Recess, 10. Projection.

Claims (1)

[Scope of utility model registration request] A back crest includes an upper finger bar having an upper engaged portion of a protrusion that protrudes upward, an upper finger bar that protrudes backward and whose upper surface is formed as a receiving portion, and a lower finger bar that has a lower engaged portion of a protrusion that protrudes downward. an upper engaging piece provided on the rear surface of the rising portion of the fork base end, having an upper notch portion that slidably engages with the upper engaged portion of the upper finger bar and an abutment portion that faces the receiving portion; , an upper engaging piece that comes into contact with the receiving part of the upper finger bar in the fork mounting part, which is provided with a lower engaging piece having a lower notch that slidably engages the lower engaged part of the lower finger bar; An upper elastic member is provided in the abutment portion of the fork, and a lower elastic member is provided at a position opposite to the lower finger bar on the rear surface of the rising portion of the fork, and is compressed by the load applied to the fork to deepen the biting of the upper notch into the upper engaged portion. A fork mounting structure for a forklift, characterized by the provision of.