JPS6333913Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a hydraulic piping that connects an attachment drive actuator installed in a lift bracket and a hydraulic unit on the truck body side in a forklift.

FIG. 1 shows conventional hydraulic piping for a pulley type attachment. As shown in the figure, a fixed pipe 8 extending from a control valve is attached to the outer mast 1, and a hose 4 connected to this fixed pipe 8 is attached to the inner mast 2. Hose pulley 3 attached to the upper end of the
The other end of the hose 4 passes through the front surface of the tire 15 and is connected to a connector pipe 16 attached to the lower front end of the lift bracket 5 or the lower rear surface of the finger bar 13. In this piping, as shown in Fig. 2, the connector pipe 1
6 cannot rise above the hose pulley 3, and in order to maximize the maximum lifting height, it is necessary to attach the connector pipe 16 to the lower end of the lift bracket 5 or the finger bar 13. The piping must pass through the front of the tire 15. Therefore, the finger bar 13 is displaced further forward to avoid interference between the hose 4 and the tire 15, and as a result, the center of load moves forward compared to a standard vehicle, resulting in a reduction in the carrying load. Become.

Additionally, although not shown, hose reel type piping is not only expensive, but also has a much larger diameter than a hose pulley, so there is a risk of interference with the head guard when the mast is tilted backwards. There is a problem that the angle is restricted.

The present invention was developed in view of the above-mentioned conventional problems, and provides hydraulic piping for pulley-type attachments in forklifts that can prevent the center of load from shifting forward and stabilize the vehicle. This is what I am trying to do.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 3 and 4. In the figure, 1 is an outer mast that is attached to the front end of the vehicle so that it can be tilted forward and backward, and 2 is an inner mast that is attached to the outer mast 1 so that it can be moved up and down.A hose pulley 3 is attached to the upper end of the outer surface of the inner mast 2. It is rotatably mounted via a pulley bracket 17 so that the front end is rearward of the front surface of the mast.

One end of the hose 4 hung on the hose pulley 3 is attached via a rotary joint set plate 6 to the front upper end of the lift bracket 5 that moves up and down along the inner mast 2 or to the rear upper end of the finger bar 13. It is connected to a rotatable rotary joint 7, and a pipe or hose (not shown) on the side of an attachment actuator attached to the lift bracket is connected to the other side of the rotary joint 7. Further, the other end of the hose 4 is connected to a fixed pipe 8 attached to the outer mast 1 in a substantially U-shaped curved state. Two return springs 11 are stretched between a split hose clamp 9 attached to the other end of the hose 4 and a spring set plate 10 attached to the outer mast 1 so as to sandwich the hose 4. Appropriate tension is applied to the hose 4 so that its slack can be absorbed. Further, a hose guide 12 made of rollers or the like is rotatably attached to the spring set plate 10, and guides the hose 4 so that the hose 4 moves smoothly.

This embodiment is configured as described above,
Therefore, when the fork 14 is located at the lower end as shown in FIG. 3, the hose 4 does not pass in front of the tire 15, so there is no need to consider the interference of the hose 4 with the tire 15 as in the conventional case, and the fin The Gerber 13 can be mounted rearward by the length of the hose with respect to the lift bracket 5, that is, closer to the vehicle body side. This will help increase the carrying load by shifting the load center of the cargo handling device closer to the vehicle body.

Furthermore, in the state shown in FIG. 4 in which the fork 14 is located at the rising end, the rotary joint 7, which is the connection part of the hose 4, rises beyond the hose pulley 3 as shown in the figure, and therefore a large maximum lifting height is obtained. However, at this time, the rotary joint 7 rotates in conjunction with the upward movement, thereby preventing the hose connection portion from bending or bending as shown in the figure and keeping it in a substantially straight state. The same is true when descending. In addition, when the fork 14 is at the rising end, the required length of the hose 4 is longer than the required hose length when the fork is at its lowest position, so the hose 4 moves upward by that amount against the tensile force of the return spring 11. The amount by which the hose 4 is pulled up is determined by the U-shaped loop portion formed on the connection side with the fixed pipe 8, as described above. Then, when the fork 14 descends from the ascending end, the hose 4 that was pulled up during its descent is returned to its original state by the return spring 11.

In addition, in this embodiment, a return spring 11 is installed to prevent the hose 4 from sagging.
can be used as a spring for absorbing the semi-free amount by appropriately selecting its working length or mounting position.

As detailed above, the present invention connects the hose arranged along the mast and the attachment actuator side piping via a rotary joint, and connects this rotary joint to the lower end of the lift bracket. The hose is attached to the upper end of the lift bracket or finger bar so that the hose is not restricted by the tire even when the hose is in the position. Therefore, according to the present invention, in pulley-type piping, the hose can be connected to the actuator side piping. It is possible to raise the connection part above the pulley without bending the hose, and a large lift height of the attachment can be obtained, and it is also necessary to move the front end position of the lift bracket, that is, the mounting position of the finger bar forward. It is possible to increase the carrying load of the vehicle and ensure vehicle stability by using the same lift bracket as in the case of a standard vehicle.

Furthermore, according to the present invention, the rotary joint moves up and down while rotating in response to the up and down movement of the lift bracket, thereby actively preventing bending or bending of the hose connection portion to the rotary joint, and Since the connection part can always be maintained in a substantially straight state, it is extremely effective in extending the life of the hose connection part.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an example of piping in a conventional forklift, Fig. 2 is a side view showing the state when the forklift is at its highest point, Fig. 3 is a side view showing an embodiment of the present invention, and Fig. 4 is a side view showing an example of piping in a conventional forklift. Similarly, FIG. 5 is a side view showing the state when the fork is raised to its highest position, and FIG. 5 is a front view showing the state in which the hose pulley is attached. 1...Outer mast, 2...Inner mast, 3...Hose pulley, 4...Hose, 5...Lift bracket, 7...Rotary joint, 9...Hose clamp, 11...Return spring.

Claims (1)

[Scope of utility model registration request] A hose pulley is attached to the upper end of the inner mast that moves up and down along the outer mast so that its front end is behind the front of the mast, and one end of the hose hung from this hose pulley is attached to the upper end of a lift bracket or finger bar. The rotary joint is connected to a possible rotary joint so that when the lift bracket is at the rising end, the rotary joint is displaced above the hose pulley. The bending or bending of the hose connection end to the rotary joint can be absorbed, and a hose clamp is attached to the other end of the hose, and a return spring is tensioned between the hose clamp and the outer mast to absorb the slack of the hose. Hydraulic piping for a pulley type attachment on the installed forklift.