JPS6316711Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reverse winding prevention device for an electric winch, particularly a small electric winch that is suspended at a desired position by a hook or the like.

Generally, this type of winch uses a motor to rotate a drum forward and backward, and winds or lets out a wire around the drum to raise and lower objects.

However, in conventional winches of this type,
If you unwind the wire with random winding when winding it around the drum, or if you overspeed the motor in the unwinding direction even after the wire has finished unwinding, the wire will wind around the drum in the opposite direction, resulting in the so-called reverse winding phenomenon. This caused the problem of the machine becoming inoperable or malfunctioning.

Therefore, the present application is an improvement to eliminate the above-mentioned drawbacks of the conventional wire, and aims to provide a reverse winding prevention device with a simple structure that senses the movement of the wire during reverse winding and stops the drive of the motor.

Hereinafter, one embodiment of the present invention will be described based on the drawings. A is a drum around which a wire is wound, which is connected to the drive shaft of a motor B via a drive transmission means C such as a gear train, and is connected to a side wall D of the winch body. It is fixed to a rotatably supported pinion shaft E, and is rotatable following the forward and reverse rotation drive of the motor B.

The reverse winding prevention device F according to the present invention is provided with a sensing means, a detecting means, and an elastic means on a side wall 1 formed on the main body so as to face the main body side wall D with the drum A in between. The means consists of a limit plate 3 having a bar 2 fixed to its tip in a cantilevered manner, the base end of which is pivoted around a shaft 7, and when the wire moves in reverse, the wire comes into contact with the bar 2 and the limit plate 3 is provided so as to be able to swing in the radial direction of the drum A, and the detection means consists of a micro switch 4 fixed within the swing range of the limit plate 3, and its contact arm 4' is attached to the limit plate. 3 is actuated to stop the driving of the motor, and the elastic means includes a tension coil spring 6 whose one end is latched to the limit plate 3, and the other end of which is fixed to the side wall 1 or a latching portion fixed thereto. 11, and holds the limit plate 3 in the non-operating position of the contact arm 4' of the micro switch 4.

In the above description, the reverse winding prevention device F is provided on the side wall 1, but its mounting position is not limited to this position, and it may be provided on the main body side wall D.

Therefore, since the present invention is constructed as described above, the third
As shown in Figure A, when the winch normally winds up the wire 5 and is unwinding it, the limit plate 3 is held in the non-operating position of the contact arm 4 of the micro switch 4 by the tension coil spring 6, and its tip is It is further away than wire 5. If a reverse winding phenomenon occurs when the wire 5 is fed out as shown in FIG. 3B, the wire 5
In order to move the limit plate 3 from the position shown in Figure A to the position shown in Figure 3 B and swing it in the direction of the arrow X against the elasticity of the tension coil spring 6, the limit plate 3 is connected to the contact arm of the micro switch 4. 4' is activated to stop the feeding rotation of the motor, thereby preventing the wire from winding backwards.

As explained above, according to the reverse winding prevention device for a winch according to the present invention, the sensing means held in a predetermined position by the elastic means swings as the wire 5 moves during reverse winding, actuating the sensing means and driving the motor. Since the motor is stopped, the motor is stopped at the same time as the reverse winding occurs, and the wire 5 is prevented from being reversely rotated by the drum A. This not only eliminates troubles and malfunctions caused by this, but also prevents the winch from operating normally. In some cases, as shown in Fig. 3C, the reverse winding prevention device does not operate unless the center of gravity of the winch moves significantly and tilts, so not only is there almost no malfunction, but the structure of the present invention is extremely simple, so it can be manufactured at low cost. Furthermore, it has practical effects such as being able to be easily attached to conventional winches without any special processing.

[Brief explanation of the drawing]

Fig. 1 is a front cross-sectional view of a winch equipped with a reverse winding prevention device according to the present invention, Fig. 2 is a side view of its essential parts, Fig. 3 A is a normal operating state diagram, and Fig. 3 B is a reverse winding special state diagram. , FIG. 3C is a malfunction state diagram. A...Drum, B...Motor, F...Reverse winding prevention device, 3...Limit plate, 4...Micro switch, 5...Wire, 6...Tension coil spring.

Claims (1)

[Scope of utility model registration request] A winch that winds or unwinds a wire by rotating a drum in forward and reverse directions using a motor, and a sensing means having a base end pivoted to either side wall of the drum so that the tip abuts the wire and swings;
a detection means fixed within a swinging range of the sensing means so as to be actuated by the swinging of the sensing means and stop driving the motor; and further to maintain the sensing means in a non-operating position A reverse winding prevention device for an electric winch, characterized in that one end of an elastic means is hooked to a sensing means and the other end of an elastic means is hooked to a sensing means.