JPH0316397Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a shutter fall prevention device that prevents 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 a device in which a sprocket attached to a winding shaft communicates with a speed governor housed in a case to prevent the shutter from falling.

[Problem that the invention attempts to solve]

In the conventional prevention device, when the chain that connects the opening/closing machine that drives the winding shaft and the winding shaft breaks, or when a mechanical failure occurs for some reason, the shutter falls under its own weight. Although the speed governor prevents the shutter from falling suddenly and gradually lowers it, the shutter cannot be stopped midway, which is dangerous and can result in injury. There are also various inconveniences such as damage to objects at the bottom of the fall.

[Means for solving problems]

In view of the above-mentioned circumstances, and in order to eliminate these drawbacks, the present invention provides a corner at one end of the winding shaft, and attaches it by loosely fitting the long hole of the actuating plate having a long hole into this corner. During normal shutter opening/closing operations, the actuating plate always falls downward due to its own weight, and when the shutter falls due to its own weight for some reason, the centrifugal force caused by the rotation of the take-up shaft causes the actuating plate to move outward and rotate. During this rotation, a micro switch placed opposite the orbit of the actuating plate is actuated, and this electric signal pulls the solenoid, which allows the tip of the actuating plate to be placed directly above the gap between the shafts arranged in parallel with the winding shaft. A downward wedge is forcibly wedged between the take-up shaft and the shaft to stop the rotation of the take-up shaft.It prevents the risk of the shutter falling and is inexpensive due to its simple structure. It is intended to.

〔Example〕

Reference numeral 1 denotes a shutter constructed by connecting a number of slats 2. The upper part of the shutter 1 is attached to a winding shaft 4 which is supported in a case 3, and guide rails 6 are installed vertically opposite an opening 5 on both sides. The shutter 1 is raised and lowered by the rotation of the winding shaft 4 driven by the opening/closing device 6', and the opening 5 is opened and closed.

One end of the winding shaft 4 is processed into a corner, and this corner 4'
The actuating plate 9 has an elongated hole 8 with its central portion deviated from the center thereof, and is movably fitted into the elongated hole 8 of the actuating plate 9.

During normal rotational operation of the winding shaft 4, the operating plate 9 moves through the elongated hole 8 due to its own weight and always maintains a fallen state.

A fixed shaft 10 is provided which is supported in parallel with the winding shaft 4, and directly above the fixed shaft 10 and the winding shaft 4, an actuating piece 12 with an intermediate portion supported by a shaft 11 is provided so as to face downward. wedge-shaped piece 13 made of rubber, etc.
The other end of the actuating piece 12 is connected to a solenoid 15 connected to a micro switch 14 (to be described later), and the suction of the solenoid 15 forces the biting piece 13 to move between the winding shaft 4 and the fixed shaft 10. The micro switch 14 is inserted between the winding shaft 4 and the winding shaft 4.
When the actuating plate 9 loosely fitted in the corner 4' of the winding shaft 4 moves outward due to the centrifugal force caused by the rapid rotation of the winding shaft 4 and rotates, the actuating plate 9 is provided at opposite positions so that it can be operated at the end of the actuating plate 9. There is.

[Effect]

As is clear from the above structure, the actuating plate 9, which is loosely fitted into the corner 4' provided at one end of the winding shaft 4, is inserted into the elongated hole 8 by its own weight during normal operation of the winding shaft 4. The shutter is opened and closed without hitting the micro switch 14, and when the winding shaft 4 becomes free for some reason, the weight of the shutter 1 acts on the winding shaft 4. When rapid rotation is applied, the actuating plate 9 provided on the winding shaft 4 moves outward due to the centrifugal force caused by the rotation of the winding shaft 4 and rotates together with the actuating plate 9, which is provided with an edge facing the rotating orbit. When the micro switch 14 is activated,
This electrical signal attracts the solenoid 15, which rotates the actuating piece 12 which pivotally supports the intermediate part, and forces the biting piece 13 on the tip side between the winding shaft 4 and the fixed shaft 10. The biting stops the rotation of the winding shaft 4 and the descent of the shutter 1 is stopped.

As mentioned above, using the centrifugal force caused by the rapid rotation of the winding shaft 4, the actuating plate 9, which does not operate during normal operation, moves outward due to the rapid rotation and rotates, activating the micro switch 14, thereby causing the solenoid 15 to actuate. In order to stop the rotation of the winding shaft 4 by biting a piece 13 having a large friction coefficient, such as rubber, between the winding shaft 4 and the fixed shaft 10, the biting piece 13 is automatically activated in case of an emergency. Since the rotation of the take-up shaft 4 is stopped, the fall of the shutter can be prevented, and danger of injury and damage to articles can be prevented.Moreover, the structure is simple, inexpensive, and reliable.

[Brief explanation of the drawing]

The drawings show an embodiment of the shutter drop prevention device according to the present invention. Figure 1 is a front view of a shutter using the drop prevention device, and Figure 2 is a view of the shutter taken along line X-X in Figure 1. FIG. 3 is an explanatory diagram showing the normal operating state, and FIG. 3 is an explanatory diagram showing the shutter fall prevention operating state in the X--X line. 1... Shutter, 2... Slut, 4... Winding shaft, 4'... Corner, 5... Opening, 6, 6'...
Guide rail, 7... Opening/closing machine, 8... Long hole, 9...
Actuation plate, 10... fixed shaft, 11... shaft support, 12
... Actuation piece, 13... Biting piece, 14... Micro switch, 15... Solenoid.

Claims (1)

[Scope of utility model registration request] A large number of slats are connected in a row, and the upper part is attached to a take-up shaft connected to the opening/closing machine. Both sides are fitted into guide rails installed vertically facing the opening, and the rotation of the take-up shaft raises and lowers the shutter to open the opening. In a shutter device that opens and closes, the winding shaft is provided with a corner at one end, and an elongated hole offset from the middle of the actuating plate is loosely fitted into the corner, and the winding of the actuating plate is attached to the corner. A wedge-shaped biting piece is provided with a micro switch facing the edge orbit of the actuating plate which rotates due to the centrifugal force generated by the rotation of the take-up shaft, and this micro switch is positioned directly above the fixed shafts arranged in line with the take-up shaft. A shutter drop prevention device that is connected to a solenoid connected to an operating piece provided with a solenoid, and a biting piece is bitten between a take-up shaft and a fixed shaft.