JPH04361998A - Lifting equipment of fork lift truck - Google Patents

Abstract

PURPOSE:To provide a lifting equipment of a fork lift truck to which working tools can be mounted easily. CONSTITUTION:An upper fork bar 2 is fixed to the upper part of the front face of the lift roller brackets 1 and 1 which are able to climb along a mast. A lower fork bar 3 is held climbably by the lift roller bracket 1. The upper and lower fork bars 2 and 3 are connected with each other by means of a hydraulic cylinder 4. The lower fork bar 3 moves vertically because of the operation of the hydraulic cylinder 4, and the distance between the fork bars 2 and 3 varies. After the upper hook of the working tool has been engaged with the upper fork bar 2 in the state that the lower fork bar 3 is at the upper position, the lower fork bar 3 is moved downwards for engaging it with the lower hook of the working tool.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting device for a forklift.

0002

[Prior Art] A conventional forklift lifting device is
As shown in FIG. 6, there is a lift roller bracket 10 that can be raised and lowered along the mast 5, and an upper hook 61 that is fixed to the upper front surface of the lift roller bracket 10 and that supports an upper hook 61 that projects from the back surface of the actuator 6. a fork bar 20; a lower fork bar 30 fixed to the lift roller bracket 10 at a predetermined distance from the upper fork bar 20 and mooring a lower hook 62 attached to the back surface of the operating tool 6;
It is equipped with.

0003

[Problems to be Solved by the Invention] When attaching the operating tool 6 to the conventional lifting device described above, when the operating tool 6 is placed on the ground, the upper fork bar 20 is attached with the lifting device in the lowest position. Since it is located higher than the upper hook 61 of the actuator 6, the driver must first operate the tilt mechanism to lower the mast 5.
In this state, the forklift is moved forward and the upper hook 61 of the actuator 6 is engaged with the upper fork bar 20, and then the driver gets off the forklift and manually lowers the lower hook 62 of the actuator 6. This is done by engaging the fork bar 30. Note that the lower hook 62 of the actuating tool 6 is rotatably supported on a support base 63 protruding from the back surface of the actuating tool 6, and this lower hook 62 is connected to the stop pin 6.
4 etc., the downward rotation is prevented and the lower fork bar 30
It has a structure that is engaged with. Therefore, as described above, in order to engage the lower hook 62 with the lower fork bar 30, the driver must get off the forklift and do it manually, making it troublesome to attach the actuator 6 to the lifting device. This was an inconvenience.

The present invention has been made in view of the above circumstances, and a technical problem to be solved is to provide a forklift lifting device to which an operating tool can be easily attached.

[0005]

[Means for Solving the Problems] A forklift lifting device of the present invention includes a lift roller bracket that can be raised and lowered along a mast, and a pair of upper and lower fork bars horizontally suspended in front of the lift roller bracket, The lower fork bar is configured to be movable up and down by a hydraulic cylinder.

[0006]

[Operation] The forklift lifting device of the present invention is capable of varying the distance between the upper and lower fork bars by vertically moving the lower fork bar suspended horizontally on the lift roller bracket using a hydraulic cylinder. An actuator is attached to this lifting device, which has an upper hook supported by the upper fork bar and a lower hook moored to the lower fork bar. To attach the actuator to the lifting device, hook the upper hook of the actuator to the lifting device with the lower fork bar moved upward, that is, with the distance between the fork bars narrower than the distance between the upper and lower hooks on the actuator side. After that, the lower fork bar is moved downward by actuation of a hydraulic cylinder, that is, the interval between the fork bars is widened, and the lower fork bar is engaged with the lower hook of the actuating tool.

[0007]

Embodiments Hereinafter, embodiments of the present invention will be explained based on the drawings. Note that FIG. 1 shows a rear view of the main parts of the lifting device of this embodiment as seen from the rear side, and FIG. 2 shows a plan view of the main parts of the lifting device of this embodiment. The forklift lifting device of this embodiment includes a pair of plate-shaped lift roller brackets 1, 1 that are arranged opposite to each other at a predetermined interval, and an upper fork bar 2 that is fixed to the front surface of both lift roller brackets 1, 1. , a lower fork bar 3 which is arranged with a required spacing from the upper fork bar 2 and is held movably up and down in front of both lift roller brackets 1, 1; an upper fork bar 2 and a lower fork bar 3; and a hydraulic cylinder 4 connected to.

[0008] Both lift roller brackets 1, 1 are connected to a forklift mast 5 (
(shown in FIG. 5). 12 is a chain anchor, and a chain (not shown) for hoisting the lift roller bracket 1 is attached thereto. Further, both lift roller brackets 1, 1 have a pair of holding parts 1 each having a guide groove 131 extending vertically in a keyhole shape and opening on the front side on the lower side of the opposing inner surfaces.
3 (see FIG. 4) are integrally formed by welding.

A pair of guide rods 31 that fit into the guide grooves 131 of the holding portion 13 are integrally formed on the back surface of the lower fork bar 3 by welding. The guide rod 31 is fitted into the guide groove 131 of the holding portion 13 and guided, so that the lower fork bar 3 is held by both lift roller brackets 1, 1 so as to be movable up and down. Note that this lower fork bar 3 has a lower hook 62 of the operating tool 6.
are engaged to ensure the stability of the attachment of the actuator 6 to the lifting device.

The hydraulic cylinder 4 includes a cylinder 41 that is held via a pin 412 to a receiver 411 fixed to the center of the back surface of the upper fork bar 2, and a cylinder 41 that extends below the cylinder 41 and extends from the back surface of the lower fork bar 3. The piston rod 42 is held via a pin 422 in a receiver 421 fixed to the center of the lower fork bar (see FIG. 3), and the lower fork bar is moved in response to the relative expansion and contraction movement of the piston rod 42 with respect to the cylinder 41. 3 is designed to move up and down. Then, when the lower fork bar 3 moves upward to the highest position and the interval between the upper and lower fork bars becomes the narrowest, the interval between the upper and lower fork bars becomes smaller than the interval between the upper and lower hooks of the actuator 6 attached to the lifting device of this embodiment. The amount of retraction of the piston rod 42 relative to the cylinder 41 is set as follows. Further, when the lower fork bar 3 moves down to the lowest position and the fork bar interval is widest, the piston rod 42 is compressed relative to the cylinder 41 so that the fork bar interval is equal to the hook interval. The amount of movement is set. Note that this hydraulic cylinder 4 is operated by operating a switch (not shown) mounted on the driver's seat.

In order to attach the actuating tool 6 to the lifting device of this embodiment having the above-mentioned configuration, first operate the hydraulic cylinder 4 by operating a switch on the driver's seat, and make sure that the fork bar spacing is smaller than the hook spacing of the actuating tool 6 to be attached. Move the lower fork bar 3 up so that As shown in FIG. 5, when the operating tool 6 is placed on the ground, the upper fork bar 2 of the lifting device that has been lowered to the lowest position is at a higher position than the upper hook 61 of the operating tool 6, so that the driver can A tilt mechanism (not shown) is operated to tilt the mast 5 forward, and in this state, the forklift is moved forward and the upper hook 61 of the operating tool 6 is engaged with the upper fork bar 2. Then, by operating the hydraulic cylinder 4 by operating a switch and moving the lower fork bar 3 downward, the lower hook 6 of the actuating tool 6 is
2 to engage the lower fork bar 3. This completes the attachment of the operating tool 6 to the lift roller bracket of this embodiment.

As described above, according to the lifting device of this embodiment, the lower fork bar 3 can be moved up and down by operating a switch from the driver's seat to change the fork bar spacing. can be easily installed by operating the switch from the driver's seat as described above. Furthermore, it is possible to attach an actuator having a structure in which the lower hook 62 simply projects from the back surface of the actuator 6.

Note that in the above embodiment, the upper fork bar 2
Although a configuration has been described in which the lift roller brackets 1, 1 and the lower fork bar 3 are connected by a hydraulic cylinder 4 at the center thereof, a configuration in which both lift roller brackets 1, 1 and the lower fork bar 3 are connected by a pair of hydraulic cylinders 4, 4 has been described. You can also do that. It is also possible to fix the lower fork bar and to make the upper fork bar movable, and it is also possible to arrange the hydraulic cylinders upside down.

[0014]

[Effects of the Invention] As detailed above, in the forklift lifting device of the present invention, the fork bar spacing can be varied by operating a switch from the driver's seat, so the lower hook is fixed to the back of the operating tool. Even an actuator with a simple structure can be easily attached.

[Brief explanation of the drawing]

FIG. 1 is a rear view of essential parts of a lifting device according to the present embodiment.

FIG. 2 is a plan view of essential parts of the lifting device.

FIG. 3 is a sectional view taken along line AA in FIG. 1;

FIG. 4 is a sectional view taken along line BB in FIG. 1.

FIG. 5 is a side view illustrating a state in which an operating tool is attached to the lifting device.

FIG. 6 is a side view illustrating a state in which an operating tool is attached to a conventional lifting device.

[Explanation of symbols]

1 is the lift roller bracket, 2 is the upper fork bar, 3
is a lower fork bar, 4 is a hydraulic cylinder, and 5 is a mast.

Claims (1)

[Claims] Claim 1: A lift roller bracket that can be raised and lowered along a mast, and a pair of upper and lower fork bars that are suspended horizontally in front of the lift roller bracket, and the lower fork bar is configured to be movable up and down by a hydraulic cylinder. A forklift lifting device characterized by: