JPH0348159Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a safety device for a backrest. The present invention relates to a safety device for ensuring the safety of workers working on the workbench in a forklift of the type located at a certain location.

Prior Art Conventionally, as shown in FIG. 5, a flat pallet-shaped workbench 2 is fixed to a pair of left and right forks 1 by a clamp device 3, and a worker stands on the workbench 2 and presses the backrest 4. The lift is operated remotely by a remote control lever 5 placed at a predetermined position, and in order to prevent the worker from falling, a safety belt 6 attached to the worker's torso and the backrest as a safety fence are used to prevent the worker from falling. A pair of horizontally protruding support arms 7 that can be stored at 4 and a chain 8 are stretched between both ends of the support arms 7.

Problems to be solved by the invention As mentioned above, in order to ensure the safety of workers, the pair of retractable support arms installed on the backrest allows work to be done without extending forward.
Workers sometimes forget to set up a safety fence by extending the support arm, or they intentionally do not install one due to the inconvenience. There were cases where the duty to install safety fences was neglected during work.

The object of the present invention is to solve the above-mentioned problems and provide a battery forklift that can be operated safely by remote control.

Means for Solving the Problem A remote control lever for remotely operating a lift on a workbench that moves up and down along the mast is placed at a predetermined position on the backrest, and a pair of support arms are attached to the left and right sides of the backrest. Opening/closing operations of the support arm and operation of a pump motor for raising and lowering the fork by remote control in a batten forklift disposed movably between a storage position where the fork is stored in the butt crest and an operating position where the fork extends horizontally in front of the butt crest. A safety device for a lift truck that is linked with the above is a means to solve the problem.

Function: By extending the pair of support arms located on the left and right sides of the back crest forward, the work platform can be raised and lowered using the remote control lever. The support arms open and close and the hydraulic motor turns on and off. This works in such a way that workers cannot perform remote control without always setting up a safety fence.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In FIG. 1 showing a forklift from the side, 11 is a vehicle body, 12 is a driver's seat, and 13 is a mast. A backrest 17 and a pair of left and right forks 18 are attached to the front side of a lift bracket 14 which moves up and down along the mast 13 by a lift operation via lower and upper finger bars 15 and 16.

As shown in FIG. 2, the backrest 17 is formed by vertical and horizontal frame members arranged in a lattice pattern, and at the center in the left and right direction is a lift operating lever (not shown) located near the driver's seat. A separate lever 20 for remote lift operation is provided.

Horizontal frame members 21 and 2 are vertically opposed to each other with a predetermined gap at approximately the center of the backrest 17 in the height direction.
A pair of support arms 23 are attached to the bases of the horizontal frame members 21 and 22 so as to be rotatable about vertical pins 24. A locking pin 40 is attached to the backrest 17 to fix the movement. Furthermore, a chain 2 for protecting the worker is provided between the tips of the pair of support arms 23.
5 is removably installed. Further, a hanger 29 for a latch 28 at the tip of a connecting cable 27 of a safety belt 26 worn around the worker's torso is attached to a predetermined position on the horizontal frame member 21 of the backrest 17. A horizontal grip bar 30 is disposed between the upper frame member and the upper frame member. Furthermore, a storage box 31 for the safety belt 26 is installed on the lower frame member of the backrest 17.

On the other hand, as shown in FIG.
Small holes 41 and 42 for fixing are bored in the upper surface, and a pair of limit switches 32 for stopping remote control operation are fixed on the horizontal frame member 22 at the rear of the storage position of the left and right support arms 23. ing. still,
The normally closed contact of the limit switch 32 is turned on by the extension of the support arm 23.

Next, the electric control circuit of the present invention will be explained based on FIG. 4.

In Fig. 4, B indicates the battery 33 for the pump motor, and 34 for the pump motor operating switch 34a.
Magnetic switch for ON-OFF operation, 3
Reference numeral 5 denotes a remote control switching switch that is linked to a remote control hydraulic switching lever (not shown) attached to the machine base, and when performing remote control, the remote control switching switch 35 opens to the left side in the figure, and is normally opened to the driver's seat side. In case of operation from , it opens on the right side of the figure. Further, 36, 37, and 38 are a lift lift switch, a tail operation switch, and a reach operation switch, which are turned on and off as appropriate in conjunction with the lift lever, tail lever, and reach lever attached to the machine base, respectively.

Further, 32L and 32R are a left limit switch and a right limit switch installed at the rear of the support arm 23, and are turned on and off as both support arms 23 are opened and closed. Further, a remote control switch 20a is connected in series with the right limit switch 32R.
0a performs ON-OFF operation in conjunction with the lever 20.

In the above configuration, when performing remote control, the operator stands on the workbench 39 and holds the pair of left and right support arms 23 in the retracted position relative to the backrest 17.
By opening the limit switches 32L and 32R in the control circuit, the remote control switch 20a is opened and closed by operating the remote control lever 20, so the magnetic switch 34 is opened.
Since the pump operating switch 34a opens and closes along with the ON-OFF operation, the pump motor 33 can be operated and stopped. The support arm 23 is fixed by a small hole 42 and a lock pin 40, and a chain 25 is stretched between the ends of the support arm 23 and a safety belt 26 is attached.
The safety belt 26 is attached to the worker's waist, and the connecting rope 27 of the safety belt 26 is attached to the hanger 29.

In the work space surrounded by the support arm 23 and the chain 25, the worker lifts the workbench 39 by grasping the grip bar 30 of the backrest 17 with one hand and operating the lever 20 with the other hand. An action is taken. When remote control is not performed, both support arms 23 are housed in the backrest 17 and fixed by fitting the lock pin 40 into the small hole 41.

In the above embodiment, the limit switch 32 is installed at the rear of the pair of support arms 23, but the timing of the opening of the support arm 23 and the ON/OFF operation of the limit switch 32 is shifted using a cam surface. Good too.

Effects of the invention As mentioned above, with this invention, remote control is not possible unless the support arm housed in the backrest is extended, so the worker always has a safety fence, so the worker can work within a safe working space on the workbench. In addition, there is no need to use a basket or the like as a safety fence, and sufficient safety can be obtained through lightweight and simple work.

[Brief explanation of the drawing]

Fig. 1 is a side view of a battery forklift showing an embodiment of the present invention, Fig. 2 is a perspective view of its safety device, Fig. 3 is a perspective view of its main parts, and Fig. 4 is an electrical control circuit diagram of the embodiment. , FIG. 5 is a perspective view showing a conventional device. 17...Batcrest, 18...Fork, 2
0... Lever, 23... Support arm, 30... Pump motor, 32... Limit switch, 39...
…Workbench.

Claims (1)

[Scope of utility model registration request] A remote control lever for remotely operating a lift on a workbench that moves up and down along the mast is arranged at a predetermined position on the back crest, and a pair of support arms are installed on the left and right sides of the back crest. A vertical forklift that is disposed so as to be displaceable between an operating position that extends horizontally forward, and in which the opening and closing operations of the support arm are linked with the operation of a pump motor for raising and lowering the fork by remote control. safety equipment.