JPS6113519Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a push-pull attachment that pushes out a load on the fork of a forklift or pulls the load onto the fork, and particularly relates to a gripper device that grips a sheet pallet when pulling in a load. It is about improvement.

As shown in Fig. 1, the push-pull attachment of a forklift includes a face plate 2 that moves forward on the fork 1 and pushes out the load on the fork 1, and a face plate 2 that is attached to the lower part of the face plate 2 and is attached to the edge of the sheet pallet. and a grip channel channel 3 for receiving the part. Furthermore, as a gripper device for gripping a sheet pallet, the gripper device shown in FIG. 2 or 3 has conventionally been used.

That is, FIG. 2 is a sectional view showing an example of a conventional device, in which 4 indicates a gripper cylinder that generates a gripping force;
5 is a piston rod that communicates with a piston (not shown) in the cylinder and transmits the gripping force; 6 is a pivot support at the upper end of the cylinder 4; 7 is a gripper that grips the sheet pallet between it and the gripper channel 3; 8; 9 is a pivot support between the piston rod 5 and the gripper 7, and 9 is a pivot support that connects the gripper channel 3 and the gripper 7. This type uses pivot bearings 6, 8, and 9, so even if the face plate 2 and grip channel 3, which are the basis for installation, are deformed by the force of moving the load, unreasonable force will not be applied to each part. However, the gripping force is l1/l2 of the force generated by the cylinder 4, which is small considering the strength of each part.

Further, FIG. 3 is a sectional view showing another example of the conventional device, and in this type, the force generated in the cylinders 4 is directly transmitted to the gripper 7a via the guide 5a connected to each cylinder 4. Ru. In this type, the force generated by the gripper cylinder 4 is not reduced, and sufficient gripping is possible, but there are problems such as abrasion caused by dust between the guide 5a and the guide 10, and bending moment caused when the sheet pallet is pulled in, causing deformation. There are drawbacks to durability. Further, the guide 5a has a rectangular cross section. Therefore, manufacturing the guide 10 is not easy.

In addition, unless the rigidity of the greasy channel 3 is increased, there is a risk that the parallelism between the channel 3 and the greeper 7a may not be maintained on the sheet pressing surface, and the channel 3 needs to be strengthened more than necessary.

The present invention aims to eliminate these drawbacks and provide a gripper device that provides sufficient gripping force and is durable.

An embodiment of the present invention will be described below with reference to FIG. Note that the same reference numerals are used for the same or equivalent members as in the conventional device.

In the figure, 2 is a face plate, 3 is a gripper channel having a U-shaped cross section, and the gripper channel 3 is a bolt 1 attached to the lower part of the back surface of the face plate 2.
1 is fixed to the bottom of the back of the gripper channel 3. 12 is a bracket fixed to the bottom of the back of the gripper channel 3.
The base end of a swing lever 13 is rotatably connected to the bracket 12 via a first pin 14, and a gripper 1 having a rectangular cross section is attached to the tip end of the swing lever 13.
The gripper cylinder 4 has a base end connected to the back surface of the face plate 2 through a third pin 16.
The piston rod 5 is pivotally supported via the second pin 16, and the tip of the piston rod 5 is pivotally connected to the second pin 16.
A spring holder 18 is fixed to the side of the gripper 15 at a specified interval, and 19 is a spring receiving member fixed to the upper part of the gripper 15, and coil springs 20 are interposed between the spring holders 18 and the spring receiving member 19 so as to be located in the middle of the spring holders 18 as shown in the figure. (A torsion spring may be used in place of the coil springs 20.) Numerals 21 and 21 denote bolts for holding the coil springs 20 to the spring holders 18, and are screwed into the spring holders 18 so that their tips protrude a specified amount toward the spring receiving member 19.

In the device of the present invention configured as described above, when the piston rod 5 of the gripper cylinder 4 is contracted, the gripper 15 is located at the solid line position shown in the figure, and the sheet receiving surface 3A of the gripper channel 3 and the gripping surface 15A of the gripper 15 are The space between them has been greatly released, and from this state,
By extending the piston rod 5 of the gripper cylinder 4, the gripper 15 is moved to the swing lever 13.
The gripping surface 15 of the gripper 15 rotates about the first pin 14, which is the rotation center of the gripper 15.
When A collides with the sheet receiving surface 3A of the grip channel channel 3, it rotates about the second pin 16 against the biasing force of one of the coil springs 14, and the two-dot chain line in the figure rotates. As shown, the sheet S is gripped between the gripping surface 15A of the gripper 15 and the sheet receiving surface 3A of the gripper channel 3.

In the device of the present invention, which is constructed and operates as described above, the gripping force generated by the gripper cylinder 4 acts directly on the gripper 15, and has the effect of obtaining sufficient gripping force. 3 is deformed, each part remains durable regardless of excessive force, and the gripping surface 15A of the gripper 15 always faces parallel to the sheet receiving surface 3A of the gripper channel 3. , it is possible to reliably grip the sheet S without damaging the gripping portion.

In addition, when drawing the sheet S onto the fork 1, the contact area with the sheet S is large, and sufficient frictional force can be obtained.
When a force is applied to rotate the gripper 15 counterclockwise around the second pin 16, the gripper 15
The rear end will move in the direction closer to the sheet receiving surface 3A of the grip channel channel 3, and the gripping force of the sheet S will be automatically strengthened, so the sheet S will be pulled onto the fork 1. sometimes seat S
never escapes from the gripper device.

In the past, in order to ensure the gripping force of the gripper device, it was necessary to constantly supply pressure oil to the gripper cylinder 4, but in the device of the present invention, the gripper 15 is rotated around the second pin 16. can rotate to automatically generate gripping force, there is no need to constantly supply pressurized oil to the gripper cylinder 4, and it is sufficient to simply prevent contraction of the piston rod 5 in the circuit, and the hydraulic pump It also has the effect of saving driving energy, which is difficult to overlook in practical terms.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a push-pull attachment, Fig. 2 is a vertical sectional view showing an example of a conventional gripper device, Fig. 3 is a vertical sectional view showing another example of a conventional gripper device, and Fig. 4 is a vertical sectional view showing another example of a conventional gripper device. The figure is a vertical cross-sectional view of the gripper device of the present invention. 1...Fork, 2...Face plate, 3
... Grip channel channel, 3A ... Seat receiving surface, 4 ... Grip cylinder, 12 ... Bracket, 13 ... Swing lever, 14 ... First pin,
15...Gritzpa, 16...Second pin, 17...
...Third pin, 18...Spring holder, 19
... Spring receiving member, 20 ... Coil spring.

Claims (1)

[Scope of utility model registration request] a face plate that is movable in the front-rear direction on the fork, a grit channel channel that is located between the bottom surface of the plate and the top surface of the fork and is fixed to the plate, and a sheet pallet in contact with the sheet receiving surface of the channel. In a push-pull attachment having a gripper for gripping and a gripper cylinder for applying gripping force to the gripper, a bracket is fixed to the back surface of the gripper channel, and the base end of the swing lever is attached to the bracket. The gripper is rotatably connected via a first pin, and the gripper is rotatably supported on the distal end of the swing lever via a second pin, and the proximal end thereof is supported on the back surface of the face plate. The piston rod tip of the gripper cylinder, which is rotatably connected by a third pin, is rotatably connected to the second pin, and a spring holder is fixed to the side surface of the swing lever, and an upper part of the gripper is rotatably connected to the second pin. A push-pull attachment for a forklift, characterized in that a spring receiving member is fixed to the spring receiving member, and a spring is interposed between the spring receiving member and the spring holder.