JPH0620874Y2 - Overhead door fall prevention device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an overhead door for preventing a door that is opened and closed up and down when the door is dropped by cutting a hanging string such as a wire. Regarding fall prevention device.

[Prior Art] Conventionally, as a fall prevention device for vertically opening and closing a door of this type, Japanese Utility Model Publication No. 50-16422 and Japanese Utility Model Publication No. 57-2 are known.
It is known from Japanese Patent No. 969.

[Problems to be Solved by the Invention] In each of the fall prevention devices, a spring in the push-out direction is urged to the engaging piece or the protruding stopper, and the engaging piece,
When the stopper is received and suppressed by the hanging body and the hanging body is cut off, it springs out due to the repulsion of the spring, and the engaging piece projecting stopper is a hook hole provided on the trajectory of the guide rail or the engaging piece stopper on the body side. Alternatively, it is received by a fixed stopper to prevent falling. Therefore, it is troublesome to make holes on the rail or the track on the side of the body and to install a fixed stopper.Besides, the hook hole and the fixed stopper are provided on the track of the engaging piece, the protruding stopper, etc. There are inconveniences such as chipping and damage to the appearance.

[Embodiment] Next, an embodiment of a fall prevention device for an overhead door according to the present invention will be described with reference to the accompanying drawings.

1 is a door formed by connecting a plurality of panels, and this door 1 has a connecting portion of each panel and an upper and a lower bottom,
Rollers 2 are arranged respectively, and each of the rollers 2 and 2 is connected to a vertical rail 4a which is inclined with respect to the skeleton 3 so as to approach the skeleton 3 side from the upper part to the lower part, and the upper part of the vertical rail 4a. It is opened and closed by being fitted into the guide rail 4 formed of the lateral rail 4b.

The bottom 1a of the lower portion of the door 1 is provided with a bracket 5 that pivotally supports the roller 2 on the end surface, and the bracket 5 is provided with a fall prevention device A described later.

This device A is provided with a sector gear 6 at one end to rotatably pivot 8, and at the other end, a roller 7 is pivotally supported and a coil spring 14 for constantly biasing the roller 7 in the direction of the body 3 is provided. In addition, a locking plate 9 formed by bending is formed, and a claw portion 10a facing the sector gear 6 and engaging and disengaging from the sector gear is provided at one end, and the claw portion 10a is provided at the other end in the engaging direction. An engaging member 10 that pivotally supports a bending portion 10c that is bent and shaped into an L shape by providing a spring 11 that urges the spring 11 and a receiving portion 10b that is received by a pin 12 from the bracket 5.
And one end is connected to the receiving portion 10b side of the engaging member 10,
The other end is connected to a wire drum arranged at the upper part, and is composed of a hanging string 13 such as a wire for winding and rewinding the wire drum to open and close the door.

[Operation] As is apparent from the above-described structure of the present invention, the fall prevention device A provided on the bottom 1a of the door 1 has the receiving portion of the engaging member 10 by the tension of the hanging string 13 wound around the wire drum. 10b is received by the pin 12 and pulled against the spring 11, the claw portion 10a of the engaging member 10 is separated from the sector gear 6 of the locking plate 9, and the locking plate 9 of the coil spring 14 is provided. By the action, the roller 7 axially supported at the tip is brought into contact with the skeleton body 3, and the bottom of the door 1 is opened and closed in the vertical direction along the guide rail 4 and the skeleton body 3. When the suspending cord 13 is cut at the time of opening and closing and the tension of the suspending cord 13 is released, the spring 11 acting on the engaging member 10 immediately rotates the engaging member 10 around the pivotal portion in the direction of the sector gear 6. The pawl portion 10a engages with the sector gear 6 of the locking plate 9 that faces the pawl portion 10a. At this time, the roller 7 from the locking plate 9 is in contact with the skeleton 3, and the locking plate 9 is locked and fixed in that state, and when it is slightly lowered, the locking plate 9 is directed downward with respect to the skeleton 3. The guide rail 4 and the skeleton 3, which are arranged with a gentle slope so as to be sandwiched, are fitted in a wedge shape and locked to receive a drop.

[Effects] According to the present invention, as described above, the sector gear is provided and the retractable locking plate is configured such that the claw of the engaging member engages with the sector gear due to the tension loss of the suspension cord, and the locking plate is It is characterized by being held by the body and guide rails in the protruding state to prevent the door from falling.The engaging member always has the tension of the suspension cord, and the end of the engaging member's claw always protrudes. It is separated from the sector gear provided on the locking plate, and the pawl immediately engages with the sector gear of the locking plate due to the loss of tension due to the cutting of the hanging string, and the locking plate is fixed while protruding. The locking plate is clamped between the frame and the guide rail and locked, and the locking plate is fixed immediately after cutting so that the door can be securely prevented from falling. Furthermore, the locking plate uses the frame and the guide rail facing each other. Since it is locked by doing so, conventional hole processing, mounting of fixed stopper etc. There is an effect that there is no trouble of, and there is no inconvenience that spoils the appearance.

[Brief description of drawings]

The drawings show one embodiment of a fall prevention device for an overhead door according to the present invention. FIG. 1 is a side view of an overhead door provided with a fall prevention device, and FIG. FIG. 3 is an enlarged side view of the prevention device, and FIG. 3 is a front view of FIG. 1 ... door, 2 ... roller, 3 ... frame, 4 ... guide rail, 5 ... bracket, 6 ... sector gear, 7 ...
... Roller, 8 ... Pivot support, 9 ... Locking plate, 10 ... Engaging member, 10a ... Pawl, 10b ... Reception part, 11 ... Spring, 12 ... Pin, 13 ... Hanging String, A ... Fall prevention device

Claims (1)

[Scope of utility model registration request] 1. A guide rail arranged in a vertical direction with an inclination so as to approach a body toward a lower part, a door which can be guided up and down by the guide rail, one end of which is connected to the other end of which is an upper part. In an overhead door consisting of a hanging string such as a wire which is connected to a arranged wire drum and moves up and down to the door, the door has a sector gear at one end,
A roller is provided at the other end and a spring for urging in the body direction is provided, and a locking plate pivotally supported so as to project is provided, and a spring is provided in an engaging direction for engaging with the sector gear due to loss of tension in the suspension cord. A fall prevention device for an overhead door, characterized in that an engaging member for urging the lever is provided so as to face the sector gear.