JPH0247760Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a device that automatically stops an electric shutter at the upper and lower limits.

Conventionally, as this type of automatic stop device, there is one shown in, for example, Japanese Utility Model Publication No. 48-32533. This conventional example has no problem with the stopping mechanism at the upper limit (see Figure 3 of the same publication), but at the lower limit (see Figure 4 of the same publication).
(see figure), the loosened part of the shutter slat was used to operate the micro switch. Therefore, there is no problem if the shutter slat has slack only on one side, that is, on the inside of the winding in FIG. 4, but some slats have slack on both sides. If the winding loosens toward the outside, the above-mentioned conventional example cannot stop the winding, which has the drawback of causing accidents such as burnout of the motor and damage to the shutter.

In addition, a method has been proposed in which the lower limit position is detected using a stopper provided on the slat, as shown in Japanese Utility Model Publication No. 16386/1986, but in this case,
Not only does the position of the stopper have to be adjusted, but even after the adjustment is made, the slats stretch after the shutter is installed, resulting in a larger dimension from the stopper to the lower end of the shutter, and there is always some slack when the shutter is closed. Ta. Therefore, in order to stop the stopper at a particularly preferable lower limit position, it may be necessary to fix the stopper to the enclosing portion of the slat, which poses the problem of requiring extremely troublesome installation work.

Therefore, the present invention is designed to operate a micro switch to stop the descent of the shutter even if the shutter slat is loosened on either side.
Another object of the present invention is to provide an automatic shutter stop device that does not require limit adjustment.

Next, drawings showing embodiments of the present invention will be described.

First, in the switch box shown in FIGS. 1 to 3, reference numeral 1 in the drawings denotes a coil spring, and supports 2a and 2b fixed to both ends of the coil spring 1 are pivotally supported by a switch frame 3.

4 is a shaft inserted inside the coil spring 1 and both supports 2a, 2b; 5a, 5;
b is a micro switch fixed to the switch frame 3; the push buttons 6a, 6b of the micro switches 5a, 5b are opposed to the projecting plates 7a, 7b provided on the supports 2a, 2b; Push buttons 6a and 6b are pressed via buttons 7a and 7b.

8a and 8b are actuators that are inserted into the outer parts of the supports 2a and 2b and are in contact with the slats of the relaxed part formed on the outer side of the winding, and actuators that are in contact with the slats of the relaxed part formed on the inner side of the winding, the lower end of one of the actuators 8a. The upper limit stopper part 9 is formed by protruding downward.

The upper parts of both actuators 8a and 8b are sequentially opened on both sides, and the actuator 8b is formed in an L shape and protrudes toward the other actuator 8a.

The effect when the switch box configured as described above is attached to the shutter set is described in the fourth section.
Regarding Figures 1 to 6, the shutter 11
If the electric motor (not shown) continues to rotate and does not stop in a normal state even after the shutter 13 is hoisted, the water cutter 12 of the shutter 11 shown in FIG. The stopper part 9 contacts the lower end of the stopper part 9, and the stopper part 9 rotates the support 2a as shown in FIG. 5 against the coil spring 1, and this rotation causes the support 2a to rotate.
The projecting plate 7a moves away from the push button 6a of the micro switch 5a, the contact of the micro switch 5a opens the self-holding circuit of the electromagnetic contactor, and the power to the motor is turned off.
The rotation of the winding drum 14 is stopped.

Next, if the motor does not stop even though the shutter 11 is completely closed, the shutter slat 15 becomes loose between the drum 14 and the magsa 13, as shown in FIG. 5 or 6. The slat 15 of the relaxed part is the actuator 8
By pressing the tip of a or 8b, this pressing force rotates the support 2a or 2b via the actuator 8a or 8b against the tension of the coil spring 1, and this rotation causes the support 2a or 2b to rotate. The projecting plate 7a or 7b moves away from the push button 6a or 6b of the micro switch 5a or 5b, the contact of the micro switch 5a or 5b opens the self-time keeping circuit of the electromagnetic contactor, the power to the motor is turned off, and the winding drum 14 rotates. It is intended to stop.

As described above, in the automatic shutter stop device of the present invention, the supports 2a and 2b fixed to both ends of the coil spring 1 are pivotally supported on the switch frame 3, and the push buttons of the micro switches 5a and 5b fixed to the switch frame 3 are activated. At 6a and 6b, the projecting plates 7a and 7b provided on the supports 2a and 2b are pressed by the restoring force of the coil spring 1, and are further brought into contact with the slats of the loosened portion formed on the outside of the winding provided on the supports 2a and 2b. actuator 8
a and the actuator 8b that is in contact with the slat of the loosened part formed on the inside are expanded, and one of the actuators 8a is provided with an upper limit stopper part 9 that projects downward, and the drain part 12 of the shutter 11 presses against the stopper part 9. Since the shutter slat 15 is configured to prevent the shutter 11 from being over-wound when the actuator is rotated, and to prevent the shutter 11 from being lowered too much when the actuator 8a or 8b is rotated, the shutter slat 15 is Even if slack occurs on either the inner or outer side of the winding, the outer actuator 8a and the inner actuator 8b can reliably operate the micro switch 5a or 5b to stop the shutter 11 from descending. This eliminates accidents such as burnout of the electric motor and damage to the shutter, which conventionally occur, and can withstand long-term use.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a front view thereof, FIG. 2 is a sectional view taken along line A-A in FIG. 1, FIG. 3 is a simplified perspective view thereof, and FIGS. 4 to 6.
The figure is a simplified side view showing the state of use. 1...Coil spring, 2a, 2b...Support, 3...Switch frame, 5a, 5b...
Micro switch, 6a, 6b...Push button, 7a,
7b... Projection plate, 8a, 8b... Actuator, 9
... Upper limit stopper part, 11 ... Shutter, 1
2...Drainer section, 15...Shutter slat.

Claims (1)

[Scope of utility model registration request] Supports 2a and 2b fixed to both ends of the coil spring 1 are pivoted to a switch frame 3, and the supports 2 are attached to push buttons 6a and 6b of micro switches 5a and 5b fixed to this switch frame 3.
The restoring force of the coil spring 1 presses the projecting plates 7a and 7b provided on the supports 2a and 2b, and the actuator 8a contacts the slats of the loosened portion on the outside of the winding provided on the supports 2a and 2b. The actuators 8b in contact with the slats of the parts are expanded, and the actuators 8a on one side are expanded.
An upper limit stopper portion 9 is provided that projects downward to prevent the shutter 11 from being overwound when the stopper portion 9 is pressed against the drain portion 12 of the shutter 11, and the shutter slat 15 rotates the actuator 8a or 8b. Shutter 1 when
1. An automatic shutter stop device characterized in that the shutter is configured to prevent the shutter from being lowered too much.