Mechanism for detecting an obstacle preventing the proper operation of a roller-type door with sectional shutters
First Claim
1. A detection mechanism for terminating the lowering of a sectional shutter of a warehouse-type roller door in response to an obstacle engaging the sectional shutter as it is being unwound from about a horizontal shaft driven by a motor, the detection mechanism comprising;
- a switch means operatively connected to the motor, at least one strap member operatively connected to said switch means, said at least one strap member extending adjacent to the horizontal shaft and being normally spaced from the sectional shutter wound about the horizontal shaft and being positioned so as to be engaged by a slack portion of the sectional shutter created by the engagement of an obstacle with the sectional shutter as the sectional shutter is being lowered to thereby activate said switch means to control the motor and prevent further lowering of the sectional shutter by the motor.
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Accused Products
Abstract
A mechanism for detecting an obstacle preventing the proper operation of a sectional shutter of a warehouse-type door which includes a detection member mounted in the vicinity of a horizontal shaft around which the sectional shutter is wound by the operation of a motor. The detection mechanism is connected to a switch for controlling the motor and thus the rotation of the horizontal shaft about which the sectional shutter is wound. The detection member consists of at least one member which extends adjacent to but spaced from the horizontal shaft and which is engageable by a slack portion of the sectional shutter caused by the engagement of an obstacle with the sectional shutter as it is being lowered.
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Citations
13 Claims
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1. A detection mechanism for terminating the lowering of a sectional shutter of a warehouse-type roller door in response to an obstacle engaging the sectional shutter as it is being unwound from about a horizontal shaft driven by a motor, the detection mechanism comprising;
- a switch means operatively connected to the motor, at least one strap member operatively connected to said switch means, said at least one strap member extending adjacent to the horizontal shaft and being normally spaced from the sectional shutter wound about the horizontal shaft and being positioned so as to be engaged by a slack portion of the sectional shutter created by the engagement of an obstacle with the sectional shutter as the sectional shutter is being lowered to thereby activate said switch means to control the motor and prevent further lowering of the sectional shutter by the motor.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
Specification