Flexible or portable closure – partition – or panel – Roll type – With fabric leading edge fastening means
Patent
1996-05-03
1998-02-24
Johnson, Blair
Flexible or portable closure, partition, or panel
Roll type
With fabric leading edge fastening means
160310, 292DIG36, E06B 956
Patent
active
057203334
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
THIS INVENTION relates to a locking assembly and in particular, but not limited to a locking assembly for a roller shutter or door.
BACKGROUND ART
Roller shutters of the type employing a curtain travelling in a pair of opposed guides are known. The curtain is arranged to move between an open rolled up position and a lowered closed rolled down position. These shutters are commonly used on industrial and commercial buildings, garages, shop fronts and windows.
These shutters are usually positioned so the curtain travels vertically, the curtain having a leading edge which moves up and down as the curtain travels so that the leading edge is in a lowermost position when the shutter is closed. These shutters can be arranged to operate under remote control using appropriate drive and control arrangements.
The shutters usually employ a lock to prevent access. Some locks are manually controlled while others are automatic or remote controlled. The current automatic locks used do not prevent an intruder from placing a bar under the leading edge of the shutter and using the bar as a lever to lift the shutter to gain access.
OUTLINE OF THE INVENTION
It is an object of the present invention to alleviate at least to some degree the aforementioned problems of the prior art.
With the above and other objects in mind, the present invention resides in one aspect in a roller shutter or door having a curtain including a leading edge moveable between a raised open position and a lowered closed position, a locking assembly having an electrically driven retractable blocking means engageable with the shutter to inhibit the leading edge being levered away from the lowered closed position, and control circuit means for operating the locking assembly.
The roller shutter can be any of the aforementioned types including those used as doors, on industrial and commercial buildings, garages, shop fronts, windows or the like.
In another aspect, the present invention resides in a locking assembly for a roller shutter including an electrically driven retractable blocking means moveable between a retracted position allowing movement of the shutter away from a lowered closed position and an extended position blocking movement of the shutter away from the lowered closed position and control circuit means for controlling operation of the locking assembly.
The blocking means typically comprises a retractable foot having a pivot located above an eccentrically mounted weight so that the foot normally hangs in the extended position thereby blocking movement of the shutter. Typically, a releasable shutter actuated catch is employed to hold the foot in the retracted position but releases the foot when the shutter is in the lowered closed position.
The locking assembly can be operated manually or automatically using any suitable drive means. The locking assembly is under electrical control employing a solenoid or equivalent to retract the foot when it is desirable to raise the shutter. The electrically driven means typically comprises a circuit and an actuator, the circuit including a solenoid or equivalent operable to retract the blocking means in response to the actuator initiating a shutter raising action. As a safety precaution, the locking assembly is preferably equipped with means enabling manual retraction of the blocking means.
Where the roller shutter is motor driven, the locking assembly preferably employs a motor override switch so that the motor does not operate unless the blocking means is retracted. The locking assembly typically includes means responsive to retraction of said blocking means to close the override switch and thereby enable the shutter to be raised.
The locking assembly is typically housed in a narrow housing securable in a fixed location adjacent the lowered closed position of the shutter and is typically coupled to channels in which the shutter travels. In another embodiment, the housing is secured directly to flooring or to an adjacent wall or to the flooring or wall via a suitable bracket. Ty
REFERENCES:
patent: 3751088 (1973-08-01), Schlage et al.
patent: 4237711 (1980-12-01), Kambic
patent: 4782674 (1988-11-01), Johnson
patent: 5533561 (1996-07-01), Forehand, IV
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