JP2596105B2 - Forklift handling equipment - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cargo handling device for a forklift provided with an attachment that is operated in a complex manner by a plurality of hydraulic actuators, and more particularly to hydraulic equipment for driving a hydraulic actuator. It relates to an improved deployment configuration.

[Prior Art] FIG. 2 shows a hydraulic piping system in a conventional forklift provided with a content spreader as an attachment. However, the container spreader 104 and the lift bracket 103 as attachments are schematically illustrated.

In general, an attachment such as a container spreader is provided with a large number of hydraulic actuators that respond to multifunctional operations required for accurately grasping and transporting several types of containers. That is, twist lock cylinder, spreader telescopic cylinder, side shift cylinder, angle shift cylinder (all not shown)
Such is the case with hydraulic actuators. A control valve (not shown) which is directly switched by an operation unit disposed on the driver's seat side (vehicle body side) and each of the above actuators are usually connected by a hydraulic pipe 120. In this case, the hydraulic piping 120 is arranged inside or outside the mast 102 using a pulley 119 (or a hose reel).

However, in such a piping method, a control valve arranged on the vehicle body side and a hydraulic actuator on the attachment side are piped through between the masts 102.
As the number of hydraulic actuators increases, the mast
The number of pipes along 102 will necessarily increase (usually,
This increases the number of actuators by two per actuator), resulting in the disadvantage that the front view from the driver's seat is significantly impaired.

Therefore, the present applicant has already proposed a forklift cargo handling device in which a control valve is provided on the lift bracket side and the control valve is connected to operating means on the driver's seat side (Japanese Patent Application Laid-Open No. 61-81393). Thus, the number of hydraulic pipes for the hydraulic actuator disposed along the mast can be reduced, and the front view from the driver's seat can be improved.

[Problems to be Solved by the Invention] In addition, the hydraulic piping for connecting the control valve provided on the lift bracket side to the tank and the hydraulic pump provided on the driver's seat side is still arranged along the mast. Therefore, the obstruction of the view caused by the hydraulic piping remains without being solved, and it cannot be said that the view is improved in terms of improving the view.

The present invention has been devised in view of the above circumstances, and a solution to be solved is to completely improve the front view from the driver's seat by completely eliminating the hydraulic piping arranged along the mast. It is in.

Means for Solving the Problems In order to solve the above problems, the present invention arranges a hydraulic unit for driving a hydraulic actuator on a lift bracket or an attachment side, and electrically or hydraulically connects the hydraulic unit and an operation unit on a driver's seat side. It employs a new mechanically linked configuration.

Embodiment An embodiment of the present invention will be specifically described below with reference to FIG.

FIG. 1 is a perspective view of a front portion of a forklift, in which 1 is a vehicle body, 2 is a mast mounted on the front portion of the vehicle body 1 so as to be able to tilt forward and backward, and 3 is a lift bracket that moves up and down along the mast 2. The lift bracket 3 is provided with a container spreader 4 as an attachment. However, in the figure, for convenience of explanation, each of the above-mentioned members is shown separated from each other.

The hydraulic unit for driving the hydraulic actuator mounted on the container spreader 4 includes a hydraulic source device including a tank 5, a hydraulic pump 6, and the like, and an electromagnetic control valve 8 for controlling the hydraulic actuator.
The tank 5, the hydraulic pump 6, and the control valve 8 are installed at a position close to the upper surface of the container spreader 4 or one side of the lift bracket 3. One side of the control valve 8 is connected to the tank 5 by two hydraulic pipings 10 and 11, and one hydraulic piping 10 passes through a hydraulic pump 6. The other side of the control valve 8 is
Two pairs of hydraulic pipes 12, 13, 14, 15 are connected to the twist lock cylinder 16, the spreader telescopic cylinder 17, which is a hydraulic actuator on the container spreader 4 side, the side shift cylinder, the angle shift cylinder and the like (not shown). I have. Each of the above hydraulic lines 10-15
Hose is used in places where movement is required, and pipes are used in other places.

Each of the solenoids incorporated in the control pulp 8 and the hydraulic pump 6 are electrically connected by remote control switches 18 and wire harnesses 20 and 21 provided in a driver's seat corresponding to the hydraulic actuators. It is connected. The wire harnesses 20, 21 are arranged along the mast using a pulley 19 provided at the upper end of the mast.

When the container spreader 4 configured as described above is operated on the driver's seat, the switch 18 corresponding to the hydraulic actuator is operated to operate the solenoid of the control valve 8 and the hydraulic pump 6 to switch between them. Thus, the high-pressure oil sent from the tank 5 to the control valve 8 via the hydraulic pump 6 is sent to a desired hydraulic actuator via actuator hydraulic pipes 12 to 15 and is operated.

As described above, the forklift loading and unloading device according to the present embodiment has the tank 5 and the hydraulic pump 6 arranged on the upper surface side of the container spreader 4 and the control valve 8.
Are arranged on the lift bracket 3 side, and these are connected to the switch 18 on the driver's seat side by wire harnesses 20 and 21. As a result, since the wire harnesses 20 and 21 disposed along the mast 2 are extremely thin compared to the hydraulic piping and have a significantly smaller projected area, the front view from the driver's seat side can be further improved. .

Further, since the control valve 8 and the hydraulic pump 6 that emit noise are arranged away from the driver's seat, noise at the driver's ear can be reduced.

Further, since the switch 18 disposed in the driver's seat has an electrical configuration, it can be easily changed in design, and an optimal drive position can be provided to the driver.

In the above embodiment, the hydraulic pump 5 and the control pulp 8 and the switch 18 are electrically connected by the wire harnesses 20 and 21, but may be mechanically configured using a push-pull cable or the like.

Further, the hydraulic unit for driving the hydraulic actuator may be arranged on the lift bracket or the attachment side.

[Effects of the Invention] In the forklift cargo handling device of the present invention, a hydraulic unit for driving a hydraulic actuator is arranged on a lift bracket or an attachment side, and the hydraulic unit is electrically or mechanically connected to an operation unit on a driver's seat side. Therefore, there is no need to arrange a hydraulic pipe for the hydraulic actuator along the mast, and the front view from the driver's seat can be further improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of a forklift according to an embodiment of the present invention. FIG. 2 is a perspective view of a main part of a conventional forklift. DESCRIPTION OF SYMBOLS 1 ... Body, 2 ... Mast 3 ... Lift bracket 4 ... Container spreader 5 ... Tank, 6 ... Hydraulic pump 8 ... Control valve 10-15 ... Hydraulic piping 18 ... Switch, 19 ... Pulley 20, 21 …… Wire harness

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location B66F 9/22 B66F 9/22 Z

Claims (1)

(57) [Claims] 1. A forklift loading / unloading device in which an attachment that moves up and down together with a lift bracket includes a plurality of hydraulic actuators, wherein a hydraulic unit for driving the hydraulic actuator is disposed on the lift bracket or the attachment side, and the hydraulic unit is operated with the hydraulic unit. A forklift loading and unloading device, wherein an operation unit on a seat side is electrically or mechanically connected to the operation unit.