Flexible or portable closure – partition – or panel – Roll type – With brake or stop
Patent
1987-07-02
1989-01-03
Britts, Ramon S.
Flexible or portable closure, partition, or panel
Roll type
With brake or stop
160 8, 160201, E06B 9208
Patent
active
047949732
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a safety bar for use on a door of the roll-up or sliding type.
The Applicant is aware of a number of different forms of safety reversal means used for reversing the motor of a motor actuated door of the roll-up or sliding type should such door encounter an obstruction, for example a child or animal, and reference is made to U.S. Pat. Nos. 3,891,909, 4,501,963; UK Patent No. 1,604,266; International Patent No. WO 85/01773; and Australian Patent Specification No. 532,820. In some instances, upon the door lowering onto an obstruction, the motor is arranged to send current or voltage and actuate a reversing relay in response to changes in current or voltage to thereby reverse the motor. Reversal means of this type is generally acceptable and can provide a door which functions satisfactorily from the point of view of safety, but notwithstanding this, there is always a danger of maladjustment or malfunction of such sensing means, and the main object of this invention is to provide safety improvements whereby a closing door, in the event of it encountering an obstruction or obstacle in the door opening, will brake almost instantly and will impart only a relatively small amount of force against the object.
It is a further object of the present invention to provide safety reversal means incorporating a safety bar for use on a door of the roll-up type which is effective not only to instantly brake the door upon the door encountering an obstruction, but also to quickly reverse the drive motor of the motor actuated door.
According to this invention therefore, a safety braking device for use in a door of the roller or sliding type comprises a door curtain or panel which is guided for movement along guide channels engaging its edges, said safety braking device comprising mounting means hingedly connected to the leading end of said door curtain or panel for tilting movement about a horizontal axis parallel to the plane of the door curtain or panel, and resistance means carried on said mounting means, and arranged, upon appreciable tilting movement of said mounting means, to coact with said door curtain guide channels for braking the movement of the door, the arrangement being such that when the door encounters an obstruction in its path during closing thereof, said mounting means will tilt about its said hinge axis which in turn results in the door movement being braked by virtue of the interengagement of said resistance means and the door curtain guide channels.
In a preferred embodiment of the invention, the safety braking device comprises an elongate safety bar or rail carried on the leading end of the door so as to be approximately co-extensive therewith, hinge means hingedly connecting said safety bar to said door leading end whereby the safety bar is able to tilt about a horizontal hinge axis, said safety bar carrying brake means engageable, upon appreciable tilting movement of the safety bar, against inner surfaces of the door curtain guide channels to thereby brake the movement of the door, the arrangement being such that upon the door encountering an obstruction, the safety bar is tilted about its hinge axis and the door movement is braked by virtue of the braking force applied by the brake means against the guide channels.
Preferably, the brake means comprises a pair of brake pads, one adjacent each end of said safety bar, each said brake pad being located in close proximity to said hinge axis, the lower or bottom surface of said safety bar being displaced relatively far away from said axis so that there is a mechanical advantage such as will reduce the amount of force imparted against the obstruction, and in any case add a separate braking force to the force offered by the obstruction itself.
In another preferred embodiment of this invention, the safety bar comprises an elongate metal extrusion which is approximately `V` shaped in cross-section and comprises a first leg portion sloping downwardly away from the hinge axis, an upwardly extending second leg portion having its upper free
REFERENCES:
patent: 1946920 (1934-02-01), Stahl
patent: 2661799 (1953-12-01), Wolf
Automatic Roller Doors Australia Pty. Ltd.
Britts Ramon S.
Johnson Blair M.
Lewen Bert J.
Sternberg Henry
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