JPH0615976Y2 - Forklift bucket equipment - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a bucket device attached to a fork portion in a forklift in order to load an irregularly shaped object such as gravel.

[Prior Art] In a forklift equipped with a hinged device, a means for attaching a bucket to a fork part is widely used for loading and unloading irregular shaped objects such as gravel.

The structure of a conventionally known bucket mounting portion is shown in FIGS. 6 and 7.

In the figure, 1 is a fork, 2 is a bracket, 3 is a bucket, 4 is a fixing pin, and 5 is a sheath portion provided on the left and right bottom portions of the bucket 3. The fork 1 is inserted into the sheath portion 5, and the sheath portion 5 is inserted. The bucket 3 is fixed so as not to come off from the fork 1 by the fixing pin 4 via the brackets 2 provided on both right and left sides of the bucket, and the bucket is dumped by using the vertical tilting of the hinged device. ing.

By the way, since the bucket 3 has a large manufacturing tolerance because it is a welded structure and the mounting tolerance of the fork 1 in the lateral setting position is also large, when the bucket 3 is mounted on the fork 1, the fixing pin 4 is located on the rear surface of the fork 1. It is necessary to make the gaps S ₁ and S ₂ large so as not to interfere with the lower hook 1a, and to make the gaps S ₃ and S ₄ large so that the fork 1 does not interfere with the sheath 5.

As described above, due to the manufacturing tolerance of the bucket 3 and the mounting tolerance of the fork 1, the gaps S ₁ , S ₂ , S ₃ , and S _{4 have} to be large, but the bucket 3 is required during the cargo handling work.
There is a problem in that, when the head rotates upward and downward, this gap becomes loose and a tapping sound (noise) is generated, and this tendency is particularly strong when there is no load.

In order to solve this problem, the gaps S ₁ , S ₂ , S ₃ , S
_In order to reduce the size of No. ₄ , there is no choice but to use means such as welding each mounting part after mounting the bucket to match the actual product, which not only makes the manufacturability extremely bad, but also causes the bucket to be generated by the impact during the bucket work. Due to the permanent deformation of the bucket 3, a new problem (manufacturability and removable) of the bucket 3 becomes difficult.

Further, as shown in FIG. 8, it has been proposed to attach an elastic body 6 such as rubber to the upper surface of the fork 1 (or the back surface of the bucket 3), but let's skillfully suppress the vertical and horizontal movements of the bucket 3. In that case, it is still necessary to minimize the gap, and it is unavoidable that problems in manufacturability and detachability remain.

[Problems to be Solved by the Invention] The present invention aims to solve the above-mentioned problems, and does not impair the manufacturability and the detachability of the bucket 3, and further, the rattling of the bucket 3 during the cargo handling work. An object of the present invention is to provide a bucket attachment device capable of preventing noise caused by the noise.

[Means for Solving the Problem] The present invention provides means for solving the above-mentioned problems, and the invention of claim 1) is directed to a sheath portion 5 provided on the left and right bottom portions of the bucket 3. In a bucket attachment device in which the fork 1 is inserted and the bucket 3 is fitted into the fork 1, an elastic vibration isolator 7 is inserted at the inner tip of the sheath 5 and a support member 9 for the fork 1 and A forklift bucket mounting characterized in that a bracket 11 protruding from the back surface of the bucket 3 is provided with pin holes respectively, and the pins 12 are inserted through the elastic vibration isolator 10 to fix the both. the apparatus was a gist devise of claim 2) may, when attached to the fork 1 bucket 3, the maximum compressive displacement following the clearance S of the elastic vibration-proof material 10 between the back and front of the fork 1 bucket 3 It is an gist become as occurs claim 1) bucket attachment device for a forklift according.

[Embodiment] The construction of the present invention will be described with reference to an embodiment shown in the drawings.

In the figure, 1 is a fork, 3 is a bucket, and the fork 1 is inserted into the sheath portions 5 provided on the left and right bottom portions of the bucket 3, and the bucket 3 is fitted to the fork 1. As is well known, a vibration isolator 7 made of an elastic material such as synthetic resin is inserted at the inner tip of the sheath 5. In addition, pin holes are formed at two left and right locations 9a (or 9b) of the fork support member 9 of the finger bar portion 8 of the hinged device that supports the fork 1, while the bracket 11 projects at the two left and right locations on the back surface of the bucket 3. The bracket 11 is also provided with pin holes, and the pins 12 are inserted into both pin holes via a vibration-damping material 10 made of an elastic material such as synthetic resin.
Both the support member 9 and the bracket 11 are joined and fixed by inserting.

The vibration isolator 10 has a cylindrical shape with a flange portion as shown in FIG. 5, the flange portion 10a receives a vertical (or horizontal) load, and the cylindrical portion 10b has a horizontal (or vertical) direction. Each of them receives a load and has an anti-vibration function.

The protruding length of the bracket 11 is such that no load is applied to the fork 1
When the horizontal state, the is set to occur maximum compressive displacement following the clearance S ₅ of the elastic vibration-proof material 10 between the back and front of the fork 1 bucket 3, preferably,
The amount of the clearance S ₅ can be set to be equal to the amount of compressive displacement of the vibration isolator 10 when the bucket 3 is about to move downward in the forward direction F.

The difference between the embodiment shown in FIGS. 1 and 2 and the embodiment shown in FIGS. 3 and 4 is that the mounting directions of the vibration isolator 10 and the pin 12 are different, and the purpose, action, and effect thereof are different. Are exactly the same.

[Operation] Since the present invention has the above-mentioned configuration, when the bucket 3 is attached to the fork 1 and the cargo handling work of an irregular shape such as gravel is performed, the front and rear and left and right movements of the bucket 3 are controlled by the vibration isolator 10. It is possible to suppress and absorb the shock, and also to suppress the vertical movement by the vibration damping material 10 and the vibration damping material 7 to absorb the shock.

In addition, a gap S is formed between the front surface of the fork 1 and the back surface of the bucket 3.
By providing ₅ , it is possible to prevent the generation of tapping sound. The reason is as follows.

Now, assuming that the bucket 3 is mounted without providing the gap S ₅ , the bucket 3 tends to move forward F when the bucket 3 is moved downward by operating the hinged device. Alternatively, when the forklift is traveling, the vehicle may similarly move forward F due to vibration or impact.

This force is applied to the vibration isolator 1 via the bracket 11 and the pin 12.
The vibration damping material 10 is compressed and deformed in the F direction.
Therefore, a gap ΔS is formed between the front surface of the fork 1 and the back surface of the bucket 3, which is equal to the amount of the vibration damping material 10 compressed and displaced.

If the bucket 3 is turned upward in this state or the direction of vibration or impact is reversed, the direction of the force acting on the vibration isolator 10 is also F.
Since it is reversed from (frontward) to R (rearward),
0 returns to the neutral state, and energy for compressing in the R direction still remains, but when the vibration isolator 10 returns to the neutral state, the back surface of the bucket 3 and the front surface of the fork 1 are already in contact with each other and the vibration isolation is performed. The action of compressing the material 10 does not occur, and a part of the above-mentioned residual energy is converted into tap sound.

As described above, when the gap S ₅ does not exist, a tapping sound is generated and noise is generated, but by providing the gap S ₅ between the back surface of the bucket 3 and the front surface of the fork 1 in advance, the vibration isolation is performed as described above. The force acting on the material 10 is reversed from F to R and the vibration damping material 10
Is returned to the neutral state, the residual energy that is still trying to compress in the R direction is equal to the displacement amount of the gap S _{5 and} the vibration damping material 10
Can be absorbed, and at least that amount of energy converted into a tapping sound disappears, so that the occurrence of tapping sound can be reduced.

In this case, it can be considered that the compression displacement amount of the vibration isolator 10 when the bucket 3 is inverted from the F direction to the R direction is substantially equal to or less than the compression displacement amount in the F direction.
The gap S ₅ may be equal to or less than the maximum compression displacement amount of the vibration isolator 10, and if it is preferably equal to the compression displacement amount in the F direction, the back surface of the bucket 3 and the front surface of the fork 1 do not come into contact with each other. Since the residual energy in the direction can be absorbed, it is possible to almost eliminate the generation of the tapping sound due to the contact of two persons.

[Effect] According to the present invention, the elastic vibration damping material 7 is inserted at the inner tip of the sheath portion 5 provided on the left and right bottom portions of the bucket 3, and
By supporting the support member 9 of the fork 1 and the bracket 11 protruding on the back surface of the bucket 3 by pin holes respectively, and inserting the pin 12 through the elastic vibration isolator 10, both are fixed. It is possible to prevent noise caused by looseness of the bucket 3 during the cargo handling work without impairing the manufacturability and the detachability of the bucket 3.

Furthermore, by providing a gap S ₅ between the back surface of the bucket 3 and the front surface of the fork 1 that is equal to or less than the maximum compression displacement amount of the elastic vibration isolator 10, the tapping sound caused by the contact between the back surface of the bucket 3 and the front surface of the fork 1 is generated. There are some practical effects that can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of the bucket attaching device of the present invention, and FIG.
The drawing is a partially cut-away rear view, FIG. 3 is a vertical sectional side view of another embodiment, FIG. 4 is a partially cut-away rear view thereof, FIG. 5 is a perspective view of an elastic vibration isolator, and FIG. FIG. 7 is a partially cutaway rear view of the conventional example, and FIG. 8 is a longitudinal side view of another conventional example. 1: Fork 2: Bracket (conventional example) 3: Bucket 4: Fixing pin (conventional example) 5: Sheath part 6: Elastic body (conventional example) 7: Elastic anti-vibration material 8: Finger bar part of hinged device 9: Fork support 9a, 9b: pin hole bored portion 10: elastic proof material 10a: flange portion, 10b: cylindrical portion 11: bracket 12: pin S ₁ to S _5: clearance

Claims (2)

[Scope of utility model registration request] 1. A sheath portion provided on the left and right bottom portions of the bucket (3)
Insert the fork (1) into (5) and insert the bucket (3) into the fork (1)
In the bucket attaching device adapted to be attached to the, the elastic vibration isolator (7) is inserted at the inner tip of the sheath (5), and the supporting member (9) of the fork (1) and the bucket (3) are also attached. It is characterized in that the bracket (11) protruding from the back is provided with pin holes respectively, and the pin (12) is inserted through the elastic vibration isolator (10) to fix the both. Bucket mounting device for forklifts. 2. When the bucket (3) is attached to the fork (1),
The forklift according to claim 1), wherein a gap (S ₅ ) less than the maximum compression displacement amount of the elastic vibration isolator (10) is formed between the back surface of the bucket (3) and the front surface of the fork (1). Bucket mounting device.