JPH0713898U - Forklift claws - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a forklift pawl that can be configured to be lightweight while ensuring sufficient strength and that can improve mounting strength on the forklift body side. A forklift claw 10 having a substantially L shape in a side view, which is supported on one side of the forklift main body 2 so as to be able to move up and down. A vertical portion 10a having a vertical groove 11 formed on the end face over substantially the entire length, and a vertical portion 10a.
and a horizontal portion 10b which extends forward from the lower end portion of a and is capable of supporting a conveyed article from below and has a horizontal groove 12 formed on the lower end surface over substantially the entire length.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a forklift pawl having a groove for weight reduction.

[0002]

[Prior art]

 Usually, a pair of forklift pawls provided on the front or side of a forklift is a vertically-oriented vertical part that is detachably fixed to a carriage bar supported by a mast via hook members. A horizontal portion extending forward from the lower end of the vertical portion and capable of supporting the conveyed article from below is formed in a substantially L shape in a side view. Conventionally, the forklift pawl has been manufactured by casting or the like, but recently, it has been manufactured by bending and forming a long metal plate material having a substantially rectangular cross section into a substantially L shape in a side view.

By the way, at the rear of the forklift, a counterweight corresponding to the weight of the conveyed article plus the weight of the forklift pawl is provided. Therefore, the weight of the forklift pawl on the forklift is the weight of the forklift pawl itself. The weight and the corresponding weight of the counterweight will act.

For this reason, a forklift pawl is formed by roll-forming a taper portion in which the lower end surface is formed in an inclined shape so that the lower end surface is inclined forward so as to be thinner on the front end side portion of the horizontal portion where a large load does not act. Forklift pawls, which are configured to reduce the weight of the forklift without reducing the strength of the forklift, are widely used. Further, in order to further reduce the weight of the forklift, in Japanese Utility Model Laid-Open No. 58-134397, an elongated groove is formed in the lower end surface of the tapered portion in the longitudinal direction to reduce the strength of the forklift. Forklift pawls are described that are configured to reduce the weight of the forklift without causing them.

[0005]

[Problems to be Solved by the Invention] By forming a groove on the lower end surface of the tapered portion as described in the above publication, it is possible to reduce the weight of the forklift pawl to some extent, but it is still sufficiently reduced. I can't say I did it. In other words, as the stress acting on the forklift pawl when a conveyed article is placed, tensile stress acts near the end surface side of the forklift pawl on the conveyed article side, and compressive stress near the opposite end surface. Since it works, it is possible to make the portion near the opposite end face lighter.

Further, the hook member for fixing the forklift claw to the carriage bar is attached to the forklift claw by welding or the like, but in addition to shear stress or tensile stress between the forklift claw and the hook member, it is twisted. Since the tensile stress acts, it is necessary to set the welding area of both to be sufficiently large to increase the mounting strength. An object of the present invention is to provide a forklift pawl that can be configured to be lightweight while ensuring sufficient strength and that can improve mounting strength on the forklift body side.

[0007]

[Means for Solving the Problems]

 The forklift pawl according to claim 1 is a forklift pawl that is supported by one side of the forklift body so as to be able to move up and down, and has a substantially L-shape in a side view. The forklift pawl extends vertically to one side of the forklift body. And a horizontal portion that extends forward from the lower end of the vertical portion, can support the conveyed article from below, and has a horizontal groove formed on the lower end surface over substantially the entire length. .

Here, as in claim 2, the vertical groove may be formed over a part or the entire length of the end face of the vertical portion on the forklift body side, and as in claim 3, the fork The lift pawl may be formed by bending a metal plate material having a predetermined length and having a groove formed in advance on one side, with the groove facing outward.

[0009]

[Action]

 In the forklift pawl according to claim 1, since a horizontal groove extending over substantially the entire length is formed on the lower end surface of the horizontal portion where tensile stress does not act, the strength / rigidity of the forklift pawl is not reduced. It is possible to significantly reduce the weight of the forklift pawl.

According to the second aspect of the present invention, since the vertical groove is formed over a part or the entire length of the end surface of the forklift body side of the vertical portion where no tensile stress acts, the strength / rigidity of the forklift pawl is increased. It is possible to further reduce the weight of the forklift pawl without reducing the weight. In addition, it is possible to fit a part of the hook member for fixing the forklift pawl to the forklift main body side to the vertical groove and weld it, so that the welding area between the forklift pawl and the hook member can be easily increased. It is possible to do. According to the third aspect of the present invention, by bending a metal plate material having a groove on one side in advance with the groove on the outside, it is possible to easily form a horizontal groove or a vertical groove. Become.

[0011]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present embodiment, the present invention is applied to a forklift pawl of a counterbalance forklift. As shown in FIG. 1, the forklift 1 is basically provided at the front part of the forklift main body 2 and a forklift main body 2 of four wheels or three wheels movable by a driving means such as an engine or an electric motor. The lifter means 4 is provided to support the conveyed article 3 from below and can be moved up and down, and the counterweight 5 provided at the rear portion of the forklift body 2. Since the forklift body 2 has a general structure, its detailed description is omitted.

The lifter means 4 will be described. As shown in FIGS. 1 to 3, a pair of left and right inner masts 6 in a substantially vertical direction are provided at a front end of the forklift body 2 with a predetermined distance therebetween. Outer masts 7 are provided on the left and right inner masts 6 so as to be vertically movable, and a carriage bar 8 is fixed between the front end faces of the left and right outer masts 7 by welding or bolts. A pair of left and right forklift pawls 10 are provided on the front side of the fork 8, and the forklift pawls 10 can be moved in the left-right direction to the carriage bar 8 via a pair of upper and lower hook members 9 fixed to the vertical portion 10a. The forklift pawl 10 is attached to the inner mast 6 via a chain arranged in the inner mast 6 by a lift cylinder (not shown) together with the carriage bar 8. It goes up and down along.

As shown in FIGS. 2 to 4, the forklift pawl 10 extends in the front direction from a vertical portion 10 a arranged in the front side of the carriage bar 8 in a substantially vertical direction and a lower end portion of the vertical portion 10 a. It is formed in a substantially L shape in a side view from the horizontal portion 10b, a vertical groove 11 is formed on the rear end surface of the vertical portion 10a over substantially the entire length, and a horizontal groove 11 is formed on the lower end surface of the horizontal portion 10b over the entire length. 12 are formed, and the vertical groove 11 and the horizontal groove 12 are each constituted by a continuous curved surface whose central portion in the width direction is depressed toward the central portions of the vertical portion 10a and the horizontal portion 10b. A reinforcing portion 13 for partitioning the vertical groove 11 and the horizontal groove 12 is formed in the bent portion 10c of the horizontal portion 10. The lower end surface of the horizontal portion 10b is inclined forwardly upward and the tapered portion 14 is thinner toward the front end side. Are formed. As shown in FIG. 5, the vertical groove 11 and the horizontal groove 12 may be formed so that only the corners are arcuate or curved. Further, the vertical groove 11 and the horizontal groove 12 may be provided in plural. Further, the horizontal groove 12 may be omitted.

The hook member 9 is formed with a projecting portion 9 a that fits into the horizontal groove 12, and the hook member 9 has the projecting portion 9 a in order to increase the bonding strength between the hook member 9 and the forklift pawl 10. It is welded to the vertical portion 10 a of the forklift pawl 10 while being fitted in the horizontal groove 12.

Here, a brief description will be made on a method for manufacturing the forklift pawl 10. First, as shown in FIG. 6, a metal plate material having a rectangular cross section is rolled by a rolling device so as to be substantially centered in the width direction. A groove 20 is formed in the portion and is cut to a predetermined length to produce a metal plate material 21 with a groove. Next, as shown in FIG. 7, one end side portion of the metal plate material with groove 21 is rolled to form a tapered portion 14 having an inclined end surface on the groove 20 side, and as shown in FIG. A bulging portion 13A is formed in the approximately central portion in the length direction of the metal sheet material 21 with grooves by upsetting. However, when the horizontal groove 12 is not provided, the groove 20 is formed in a substantially half portion in the length direction.

Next, as shown by phantom lines in FIG. 8, the metal plate material 21 with grooves is bent about 90 ° around the bulging portion 13 A with the grooves 20 on the outside, and the vertical grooves are bent by the grooves 20. The groove 11 and the horizontal groove 12 are formed, and the reinforcing portion 13 is formed by the bulging portion 13A to obtain the forklift claw 10.

Next, the operation of the forklift pawl 10 will be described. As shown in FIG. 9, when the conveyed article 3 is placed on the horizontal portion 10b of the forklift pawl 10, tensile stress acts on the portion of the forklift pawl 10 on the conveyed article 3 side, and compressive stress acts on the opposite side. Will work.

Therefore, a vertical groove 11 and a horizontal groove 12 are formed on the rear end surface of the vertical portion 10a and the lower end surface of the horizontal portion 10b, which are portions on the side opposite to the conveyed article 3, respectively, for a forklift. Even if the weight of the claw 10 is significantly reduced, its strength and rigidity are hardly reduced. Moreover, in the forklift 1, since a pair of left and right forklift pawls 10 are provided and a weight corresponding to the forklift pawls 10 is added to the counterweight 5, the forklift 1 as a whole has one. The weight is reduced by four times the weight reduction amount for the forklift pawl 10. In the present invention, specifically, it is possible to easily reduce the weight by 20 to 30% with respect to one forklift pawl 10.

Further, since the protrusion 9a is fitted into the vertical groove 11 and the vertical portion 10a and the hook member 9 are welded to each other, the welding area between the hook member 9 and the vertical portion 10a is increased, and It is possible to easily improve the bonding strength of. Further, since the vertical groove 11 and the horizontal groove 12 are formed by a smooth curved surface, stress concentration is prevented from occurring on the surface forming the vertical groove 11 and the horizontal groove 12, and for a forklift truck. The strength and rigidity of the claw 10 can be improved. Furthermore, the reinforcing portion 13 can reinforce the bent portion 10c of the forklift pawl 10. However, since the reinforcing portion 13 is formed on the portion of the forklift pawl 10 opposite to the side of the conveyed article 3, the strength of the forklift pawl 10 does not significantly decrease even if omitted.

Although the present invention is applied to the counterbalance forklift 1 in the present embodiment, the present invention can also be applied to other types of forklifts such as reach forklifts and side forklifts.

[0021]

[Effect of device]

 As described in detail in the section of the action, the following effects can be obtained. According to the forklift pawl according to claim 1, the weight of the forklift pawl is sufficient to ensure sufficient strength and rigidity of the forklift pawl with a simple configuration in which the horizontal groove is formed on the lower end surface of the horizontal portion. Can be significantly reduced, and the entire forklift can be configured to be significantly lighter.

According to the second aspect, since the vertical groove is formed over a part or the entire length of the end surface of the vertical portion on the forklift body side, the strength and rigidity of the forklift pawl is not reduced. By reducing the weight of the forklift claws, the entire forklift can be made even lighter. By fitting a part of the hook member into the vertical groove, the joint area between the vertical part and the hook member can be increased. This makes it possible to significantly improve the mounting strength of the forklift pawls, and the like. According to claim 3, a horizontal groove or a vertical groove can be easily formed by forming a groove on the metal plate material by rolling or the like and bending the groove with the groove being an outer side. Therefore, the manufacturing cost of the forklift pawl can be reduced.

[Brief description of drawings]

FIG. 1 Side view of a forklift

FIG. 2 is a perspective view of a lifter means.

FIG. 3 is a side view of the lifter means.

FIG. 4 is a sectional view of a forklift pawl.

FIG. 5 is a cross-sectional view of a forklift pawl according to a modification.

FIG. 6 is a perspective view of a grooved metal plate material.

FIG. 7 is a perspective view of a grooved metal plate material having a tapered portion.

FIG. 8 is a perspective view of an upset grooved metal plate material.

FIG. 9 is a diagram showing the relationship between the depth from the surface of the conveyed article and the stress.

[Explanation of symbols]

 2 Forklift main body 3 Transported goods 10 Forklift claws 10a Vertical part 10b Horizontal part 11 Horizontal groove 12 Vertical groove 20 groove 21 Metal plate material

Claims (3)

[Scope of utility model registration request] 1. A forklift claw that is supported by one side of a forklift body so as to be able to move up and down and is substantially L-shaped in a side view, and a vertical part that is vertically disposed on one side of the forklift body. A forklift pawl, comprising: a horizontal portion that extends forward from the lower end of the vertical portion, can support the conveyed article from below, and has a horizontal groove formed on the lower end surface over substantially the entire length. 2. The forklift pawl according to claim 1, wherein a vertical groove is formed over part or the entire length of the forklift body side end surface of the vertical portion. 3. The forklift pawl is formed by bending a metal plate material having a predetermined length with a groove formed in advance on one side thereof with the groove outward. The forklift pawl according to claim 2 or 3.