JPH08260839A - Hoist type overhead door - Google Patents

Abstract

PURPOSE: To make it possible to lock the revolution of a winding shaft when the pulling operation of a hand-chain is quick, in a hoist type overhead door. CONSTITUTION: A lock device 12 is provided to one side of a chain hoist 7 interlocked and joined with a winding shaft. When a hoist shaft 8 is revolved on the basis of closing operation, the revolution of the hoist shaft 8 is locked at a stage slightly/before the closing operation of a door body 12 may run into an accelerated revolving state in which the operation can not followed a wind-off speed of a suspended body from a winding device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hoist type overhead door installed in an opening of a building such as a building, a house or a factory warehouse.

[0002]

BACKGROUND OF THE INVENTION Generally,
This kind of overhead door is constructed by connecting a lifting body extended from a winding machine arranged above the opening to the lower end of the door body which is guided to be opened and closed by a guide rail built in the opening of the body. The door body is opened and closed by unwinding and rewinding the body from the winding machine.In such an overhead door, a hoist is interlocked with the winding machine and pulled out from the hoist. There is a hoist type that opens and closes the door by pulling the operating chain.

By the way, in the case of this hoist type, in the case of the operating chain, the hoist shaft is rotated by the pulling operation of the operating chain, and the hoisting body is unwound by the rotation of the winding drum in the winding machine based on this. , Rewinding is performed, but for example, when pulling the operating chain to close the fully opened state, the lifting body will be fed out from the winding drum. If the speed is too fast, the closing operation of the door body does not follow the feeding amount of the lifting body, which causes the lifting body to entangle with each other due to the backlash phenomenon or come off from the winding drum. There is a fear.

On the other hand, some overhead doors are provided with a speed governing device (governor device) in the winding machine so that the rotation speed of the winding drum does not become too fast. It can be prepared not to be too fast. By the way, there are some overhead doors that are housed in a posture in which the door body is close to a horizontal state, and in such a thing, the closing speed of the door body at the beginning of the closing operation is slow, and if the speed governor is set accordingly, There is a problem that smoothness is impaired because only a slow closing operation is performed even when there is no problem even if the door body's own weight lowering force is increased and the closing speed is increased.

[0005]

SUMMARY OF THE INVENTION The present invention was devised with the object of providing a hoist type overhead door capable of eliminating these drawbacks in view of the above-mentioned circumstances, and a frame opening portion is provided. The lower end of the door body, which is guided to open and close by the guide rail built in, is connected to the tip of the suspension body that is wound around the winding machine installed above the opening to support the suspension of the door body. Then, in an overhead door configured to open and close the door body with unwinding and unwinding of the hanging body by a winding machine, a door body using a hoist interlocked with the winding machine is used. When the hoist is configured to be opened and closed, the hoist is provided with a lock means for locking the abnormal acceleration rotation of the hoist shaft.

According to the present invention, the closing operation can be performed safely and lightly without the feeding speed of the lifting body exceeding the closing operation speed.

[0007]

Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a door body of an overhead door which is built in a frame opening, and the door body 1 is formed by connecting a plurality of panel bodies 1a in a vertical direction in series via hinges 1b. Although it is a thing, each panel body 1a
Mounting members 2 are provided on both left and right edge portions of the guide roller 2a, and the guide roller 2a is supported while protruding outward. The door body 1 opens and closes in a state where the guide rollers 2a are fitted and guided by the guide rails 3 having a substantially L-shape built from the both sides of the opening of the frame to the ceiling, and the opening is closed. The closed posture and the stored posture stored in the ceiling guide rail 3 are transformed. On the other hand, a winding shaft 4 is supported above the opening, and a pair of winding machines 5 are integrally provided on both sides of the winding shaft 4. The tip end of the lifting body 6 whose one end is wound around the winding machine 5 is attached to the left and right edges of the lowermost panel body 1a.
The door body 1 is suspended and supported by the suspension body 6 by being connected to each other, and the suspension body 6 is unwound as the winding machine 5 rotates forward and backward based on the rotation of the winding shaft 4. The door body 1 is rewound so that the door body 1 can be opened and closed.

Reference numeral 7 denotes a chain hoist disposed on one end side of the winding shaft 4, and the chain hoist 7
Is integrally attached to a hoist shaft 8 that is rotatably supported by a hoist mount 7a that is integrally attached to the skeleton so as to rotate integrally with the hoist shaft 8, and is hung around the outer periphery of the chain hoist 7. The chain hoist 7 is set to rotate together with the hoist shaft 8 on the open or closed side by pulling the hand chain 9. Split pin 1 on the other side of this hoist shaft 8.
The first sprocket 10 attached via 0a is linked to the second sprocket 11 provided at one end of the winding shaft 4 via a chain 10b. The winding shaft 4 is set to rotate forward and backward based on the forward and reverse driving operation of the chain hoist 7.

On the other hand, on one side of the chain hoist 7,
Locking device 1 corresponding to the locking means of the present invention
2 is provided so that the rotation of the hoist shaft 8 is locked when the pulling operation of the hand chain 9 toward the closing side is suddenly performed and the chain hoist 7 is rapidly rotated during the closing operation of the door body 1. Is set to. That is, the lock shaft 13 constituting the lock device 12 is attached to one side of the hoist shaft 8 so as to integrally rotate via the split pin 13a, while the casing 12a of the lock device 12 is attached to one side surface of the hoist mount 7a. It is fastened. In the casing 12a, a latch plate 14 which is fitted onto the lock shaft 13 and rotates integrally with the lock shaft 13, and a first lock body 15 which is disengageably engaged with a latch tooth 14a formed on the latch plate 14. And latch teeth 1 on the inner peripheral edge
6a is formed and is provided so as to be freely rotatable with respect to the lock shaft 13, and the first lock body 15 is provided via the operating body 17.
A cylindrical latch cup 16 for actuating
A second lock body 19 which is fitted into the latch cup 16 and externally engages with a latch tooth 16a of the latch cup in a state where the cam surface is formed on a cam body 18 which rotates integrally with the lock shaft 13; A rotary plate 20 which is freely rotatably fitted onto the lock shaft 13 and a friction spring 21 which is interposed between the second lock body 19 and the rotary plate 20 are internally provided. Reference numeral 22 is a return bullet that urges the latch cup 16.

In the normal closing operation, the lock shaft 1
Following the rotation of 3, the respective members integrally rotate and a smooth closing operation is performed. However, when the speed change in which the rotational acceleration is applied to the lock shaft 13 changes, the rotating plate 20 that freely rotates with respect to the lock shaft 13 is rotated. The relative speed becomes slower, and a rotation difference occurs between the rotary plate 20 and the second lock body 19, and the two tend to shift. Then, the force that tends to deviate is the rotating plate 20.
If it is within a range smaller than the friction resistance between the friction plate 21 and the rotary plate 20 interposed between the second lock body 19 and the second lock body 19, the rotary plate 20 is allowed to rotate integrally with the lock shaft 13. As a result, the rotation of the lock shaft 13 is not stopped. On the other hand, when the force to shift is larger than the frictional resistance of the friction spring 21, the second lock body 19 receives the fast rotational force from the cam body 18 and moves in the arrow A direction, As a result, the engagement blade 19a provided on the second lock body 19 engages with the latch tooth 16a of the latch cup. Then, the latch cup 16
Rotates with the lock shaft 13 while being integrated with the second lock body 19, and the rotation of the latch cup 16 causes the actuation body 17 to oscillate, which causes the first lock body 15 to move to the latch teeth 14a of the latch plate. Mesh with the lock shaft 13
Is set to stop rotating. Here, the magnitude of the frictional resistance between the friction spring 21 and the rotary plate 20 is determined by the speed at which the lock shaft 13 extends the lifting body 6 from the winding machine 5 based on the closing operation of the chain hoist 7. On the other hand, it is set to a size that allows the second lock body 19 to move a little before reaching the abnormal acceleration rotation state, which is a speed state in which the closing operation of the door body 1 does not follow, whereby the hoist shaft 8 has an abnormal acceleration. The rotation of the hoist shaft 8 is stopped just before the rotating state.

In the embodiment of the present invention constructed as described above, the overhead door is opened and closed by pulling the hand chain 9 and rotating the chain hoist 7 to either one of the opening and closing sides. When the closing operation of the hand chain 9 is performed, the chain hoist 7 changes abruptly due to the pulling operation of the hand chain 9 to close the door body 1 with respect to the feeding speed of the lifting body 6 from the winding machine 5. If an abnormal acceleration rotation, which is a speed change state in which the operation does not follow, is about to occur, as described above, the locking device 1
The second lock arm 15 meshes with the latch teeth 14a, the rotation of the lock shaft 13 is stopped, and the rotation of the hoist shaft 8 is stopped accordingly, so that the closing operation of the door body 1 is stopped. As a result, the winding operation of the winding machine 5 is prevented from being brought into the abnormal acceleration rotation state due to the quick pulling operation of the hand chain 9, which causes a backlash phenomenon or the lifting body 6 is detached from the winding machine 5. Can be prevented.

Moreover, in this one, the chain hoist 7
Since the rotation of the hoist shaft 8 toward the closing side is stopped based on the abnormal acceleration rotation, the weight of the door body 1 is added or the hand chain 9 is gently pulled. The descent while accelerating with a normal acceleration change is allowed without being obstructed, so that there is no restriction on the descent speed unlike the one using a speed governor, and it is smooth. There is no loss of sex.

[0013]

In summary, since the present invention is constructed as described above, the door body rotates the hoist interlockingly connected to the winding machine around which the hanging body supporting the door body is wound. The hoist is equipped with a lock mechanism that locks the hoist shaft from abnormal acceleration rotation. By being locked, the backlash phenomenon does not occur and the lifting body does not come off from the winding machine.

[Brief description of drawings]

FIG. 1 is an overall front view of an overhead door.

FIG. 2 is a partially sectional front view of the chain hoist.

FIG. 3 is a side view of the chain hoist.

FIG. 4 is an exploded perspective view of a lock device.

FIG. 5 is a side view with a part of the locking device removed.

FIG. 6 is an explanatory view of the operation of the lock device.

[Explanation of symbols]

 1 Door body 2a Guide roller 4 Winding shaft 5 Winding machine 6 Lifting body 7 Chain hoist 7a Hoist mount 8 Hoist shaft 9 Hand chain 12 Lock device 13 Lock shaft

Claims (2)

[Claims] 1. A tip end of a suspension body wound by a winding machine disposed above the opening is connected to a lower end of a door body which is opened and closed by a guide rail built in the opening of the body. In an overhead door configured to support a door body by hanging and to open and close the door body by unwinding and rewinding the hanging body by a winding machine, the overhead door is interlockingly connected to the winding machine. A hoist type overhead door characterized in that, when the door body is configured to be opened and closed using a hoist, the hoist is provided with locking means for locking abnormal acceleration rotation of the hoist shaft. 2. The lock means according to claim 1, wherein the locking means locks the acceleration rotation as an abnormality in a state in which the closing operation of the door body does not follow the feeding speed of the lifting body from the winding machine based on the closing operation of the hoist. The hoist type overhead door is characterized by being set to.