JPH0316396Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a shutter fall prevention device for preventing the shutter from falling due to its own weight due to some reason when the shutter is in an open state in a shutter device.

[Conventional technology]

Conventional shutter devices include devices in which a sprocket attached to a winding shaft and a governor housed in a case are connected through a chain or the like to prevent the shutter from falling.

[Problem that the invention attempts to solve]

In the conventional prevention device, when the chain connected to the opening/closing machine that drives the winding shaft breaks or some mechanical failure occurs, the governor prevents the shutter from falling suddenly due to its own weight. However, the falling speed is suppressed and it gradually descends.
It was not possible to stop the shutter, which was dangerous and resulted in injury. Additionally, there are various inconveniences such as damage to items located at the bottom.

[Means for solving problems]

In view of the above-mentioned practical application, in order to eliminate these drawbacks, the present invention has been developed by machining a corner at one end of the winding shaft, and attaching it by loosely fitting the long hole of a moving plate with a long hole bored into this corner, and then operating the winding shaft during normal operation. The inside always falls downward due to the weight of the movable plate, and when the shutter falls for some reason, the centrifugal force causes the movable plate to move outward and rotate, causing the locking claws provided on the movable plate to face each other. It is designed to prevent the shutter from falling by being hooked to a fixed restraining member provided therein, and is intended to prevent danger when the shutter falls, and to do so at low cost with a simple structure.

〔Example〕

Reference numeral 1 denotes a shutter constructed by connecting a large number of slats 2, the upper part of which is attached to a winding shaft 4 which is supported in a shutter case 3, and guide rails 6, 6 arranged vertically opposite an opening 5 on both sides. ' and is raised and lowered by the rotation of the winding shaft 4 driven by the opening/closing device 7 to open and close the opening 5. One end of the winding shaft 4 is machined into a corner, and the long hole 8 of a movable plate 9, which has a long hole 8 offset from the center, is fitted into the corner 4' so that it can move freely. . The movable plate 9 is formed in an inverted Z shape by protruding latching claws 10, 10' in opposite directions upward and downward, and normally when the winding shaft 4 rotates, the movable plate 9 moves through the long hole 8 due to its own weight and always falls. It remains in good condition. Reference numeral 11 denotes a stopper member formed into a wedge shape, and this stopper member 11 is placed on the trajectory drawn by the hook of the moving plate 9 when the moving plate 9 is moved outward by centrifugal force due to the rapid rotation of the winding shaft 4. It is positioned and fixed to a bearing, etc.

[Effect]

As is clear from the above configuration, the present invention has a winding shaft 4.
The movable plate 9, which is loosely fitted into the corner 4' provided at one end, prevents the latch claw 10 or 10' from hitting the stop member 11 due to the weight of the movable plate 9 during normal operation of the winding shaft 4. The shutter is opened and closed while always being kept in a downward position, and when the take-up shaft becomes free for some reason, the weight of the shutter 1 acts on the take-up shaft 4, causing it to rotate rapidly. Then, the movable plate 9 attached to the winding shaft 4 moves outward due to the centrifugal force caused by the rotation of the winding shaft 4, and rotates together.
The latching pawl is hooked on a stopping member 11 provided on the rotational track of the latching pawl, and the rotation of the winding shaft 4 is stopped via the moving plate 9, thereby stopping the shutter from descending. Moreover, as mentioned above, the movable plate 9 uses the centrifugal force caused by the rotation of the winding shaft 4 and does not operate during normal operation.
Since the movable plate 9 acts on and is stopped by the fixed restraining member 11, there is no danger of injury due to falling as the movable plate 9 acts automatically in the event of an emergency.Furthermore, the structure is simple with two parts, the movable plate and the restraining member. It is inexpensive and reliable.

[Brief explanation of the drawing]

The drawings show an embodiment of the shutter drop prevention device according to the present invention, and Fig. 1 is a front view of the shutter, Fig. 2 is an enlarged view taken along line X-X in Fig. 1, and Fig. 3 is an essential view. FIG. 1... Shutter, 2... Slat, 3... Case, 4... Winding shaft, 4'... Corner, 5... Opening, 6, 6'... Guide rail, 7... Switcher, 8
... Long hole, 9 ... Moving plate, 10, 10' ... Latching claw, 11 ... Stopping member.

Claims (1)

[Scope of utility model registration request] A large number of slats are connected in series and attached to a take-up shaft connected to the opening/closing machine at the top, and both sides fit into guide rails facing the opening and are raised and lowered by the rotation of the take-up shaft to open and close the opening. In the shutter device, one end of the shutter take-up shaft has a corner portion which is machined with a corner, and a length is provided at the corner portion offset from the middle portion of a movable plate provided with a latch claw at the end portion. A shutter drop prevention device comprising a hole loosely fitted into a hole, and a stopping member fixed on a locus of a latching pawl that rotates due to centrifugal force caused by rotation of a take-up shaft of a movable plate.