JPH068155Y2 - Safety device for sinking forklift - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a sinking type forklift mainly used for raising and lowering a motor boat on a quay, and particularly to a safety device for preventing contact between the sinking mast and the quay. is there.

[Prior Art] A conventional general sinking forklift truck has, as shown in FIG. 3, for example, a sinking mast 3 whose upper end is fixed to a lift bracket 2 which is guided by the mast 1 and moves up and down. A lift bracket 5 having an attachment such as a fork 4 is moved up and down along the sinking mast 3. The subsidence mast 3 can be arranged below the machine base 6 by lowering the lift bracket 2, but in this case, the subsidence mast 3 is inclined in advance so that the subsidence mast 3 is parallel to the wall surface of the quay 7. Generally, the lift bracket 2 is lowered.

[Problems to be Solved by the Invention] However, in the conventional sinking-type forklift as described above, the cargo handling operation is performed while confirming the positional relationship between the wall surface of the quay 7 and the lower end of the sinking mast 3 from the driver's seat. Therefore, if the inclination angle of the mast 1 is set incorrectly, the lower end of the sinking mast 3 may come into contact with the wall surface as shown in FIG. In this case, not only is the subsidence mast 3 damaged, but also the fork 4
Alternatively, cargo materials may be damaged.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a safety device that issues an alarm and informs the driver if there is a risk that the sinking mast will contact the wall surface.

[Means for Solving the Problems] In order to achieve the above object, the present invention has a sinking mast that is fixed to a lift bracket that is guided by the mast and that extends vertically, and that has an attachment attached thereto. In the subsidence type forklift truck, the detection means for detecting the distance from the lower end of the subsidence mast to the wall surface located behind the lower end, and the distance detected by the detection means is less than or equal to a set value. It is characterized by a safety device consisting of an alarm device for issuing an alarm to.

[Operation] In such a configuration, when the distance between the lower end of the subsidence mast and the wall surface of the quay becomes extremely narrow, an alarm is issued and the driver can be alerted.

[Embodiment] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings. In the drawings, the same reference numerals will be used for the same or corresponding portions.

As shown in FIGS. 1 and 2, in a sinking forklift to which the present invention is applied, a pair of left and right masts 1 are erected on a front portion of a machine base 6. The mast 1 includes an outer mast 8 attached to the machine base so as to be tiltable forward and backward, and each outer mast 8
And an inner mast 9 which is attached to the inside of the so as to be moved up and down by a lift cylinder (not shown). The lift bracket 2 is guided to the inner mast 9, and is moved up and down as the inner mast 9 moves up and down. An upper end of the sinking mast 3 is fixed to each of the lift brackets 2 and extends downward. A lift bracket 5 for attaching an attachment is attached to the sinking mast 3 so as to be vertically movable along the sinking mast 3. ing. The lift bracket 5 is vertically moved by a hydraulic cylinder (not shown) provided upright between the sinking masts 3. The left and right lift brackets 5 are connected to each other by two upper and lower finger bars 10, and a fork 4 as an attachment is attached to the finger bars 10.

As shown in FIG. 2, one end of a dogleg-shaped arm 11 is pivotally supported by a pin 12 on the outer side surface of one sink mast 3, and a roller 13 is rotatably supported at its free end. ing. Further, the arm 11 is arranged so that its free end is extremely close to the lower end of the sinking mast 3.

An arm stopper 14 is welded to the outer side surface of the sinking mast 3, and the arm 11 can be swung backward until it comes into contact with the arm stopper 14. Further subsidence mast 3
A spring bracket 15 is welded to a side surface of the arm 11 at a position on the opposite side of the arm stopper 14 with the arm 11 as a boundary. The spring 16 provided between the spring bracket 15 and the arm 11 causes the arm 11 to move. It is always urged to come into contact with the arm stopper 14. Arm 11 like this
The roller 13 projects a considerable amount rearward from the rear surface of the sinking mast 3 when the roller 13 is in contact with the arm stopper 14.

Push-type switch 17 is further provided on the outer side surface of the sinking mast 3.
Is attached. The push switch 17 is mounted at a position where the push button 18 is pushed by the arm 11 to be turned on when the arm 11 is swung forward and the protrusion amount of the roller 13 is equal to or less than a preset value d. Is. This protrusion amount d is a distance between the settlement mast and the quay, which may cause contact between the wall surface of the quay 7 and the lower end of the settlement mast 3 when the settlement mast 3 is further lowered. Must be large enough to avoid. The switch 17 is preferably a waterproof type because a sinking forklift is mainly used on the waterside for raising and lowering the motor boat. Further, the switch 17 is connected to a horn 20 and a power source 21 by a harness 19, and the horn 20 is attached at a proper position so as to ring in a driver's seat 22.

A case where the subsidence mast 3 is lowered in such a configuration so as to come into contact with the wall surface of the quay 7 will be described.

When the subsidence mast 3 is lowered along the wall surface of the quay 7,
The distance between the wall surface and the lower end of the subsidence mast 3 gradually narrows,
First, the roller 13 contacts the wall surface. At this time, a relatively strong impact will be applied to the roller 13, but this impact is absorbed by the spring 16. When the sinking mast 3 is further lowered, the roller 13 rolls and is pushed forward by the wall surface, and the arm 11 is swung forward against the spring force of the spring 16. Then, when the amount of protrusion of the roller 13 is reduced to the set value d, the push button 18 of the switch 17 is pushed by the arm 11 and turned on, and a current flows through the horn 20 to cause the driver's seat 22
Gives an alarm sound. Thus, the driver knows that the subsidence mast 3 is in danger of colliding with the wall surface, and the subsidence mast 3
It is possible to take appropriate measures such as stopping the descending operation of No. 1 and changing the inclination angle of the mast 1.

In the present embodiment, the arm 11 with rollers is used as a means for detecting the distance between the wall surface of the quay 7 and the sinking mast 3, but various other types may be considered. Further, the alarm device may be of a type that appeals to the driver's visual sense instead of a type that emits an alarm sound.

As shown in FIG. 1, when the lift bracket 5 is lowered most, the fork 4 is located below the lower end of the sink mast 3, so that the fork 4 may first come into contact with the quay 7. Therefore, in order to prevent such contact between the fork 4 and the quay 7, it is desirable to provide the above-mentioned safety device not only on the sink mast 3 but also on the fork 4 or the finger bar 10.

[Effects of the Invention] As described above, according to the present invention, it is possible to prevent a contact accident between the subsidence mast and the quay, so that the subsidence mast, an attachment such as a fork, or a cargo handling article is damaged or dropped. Can be prevented and safety can be improved. Also,
Since the driver can work with peace of mind, the work efficiency is improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall view of a sinking forklift equipped with a safety device of the present invention, FIG. 2 is an enlarged view showing the safety device of the present invention, and FIG. 3 is a conventional sinking forklift. FIG. In the figure, 3 ... sinking mast, 4 ... fork 7 ... quay, 11 ... arm 13 ... roller, 16 ... spring 17 ... switch, 20 ... horn

Claims (1)

[Scope of utility model registration request] 1. A sinking forklift having a sinking mast, which is fixed to a lift bracket which is guided by a mast to move up and down and extends downward, and which has a sinking mast to which an attachment is attached, from the lower end of the sinking mast. A safety device for a sinking forklift truck, comprising: detection means for detecting a distance to a wall surface located behind the lower end portion; and an alarm device for issuing an alarm when the distance detected by the detection means is below a set value.