Door closure
First Claim
Patent Images
1. A closure device for a door which is hingedly mounted to a door jamb comprising:
- a torsion bar connected at one end at a first location to the door jamb and at its other end, at a second location, to an adjacent portion of the door;
the distance between said first and second locations, when the door is closed, being less than the length of the torsion bar whereby said bar will be attached in a manner such that when the door is open the bar will extend along a straight line from said first to said second locations, whereby when the door swings toward its closed position, the bar will bow in a direction which will generate a force tending to bias the door toward an open position;
the bar being installed in a pre-loaded torsion condition which will tend to maintain the door in its closed position when the door is closed,said torsional force of the bar and force from the bowing of the bar being directed opposite each other whereby as the door approaches its closed configuration, the progressive bowing of the bar will progressively tend to decelerate the door.
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Abstract
A self-closing door device includes a torsion bar which is connected at its ends between the hinged side of the door and the door jamb. The torsion bar is arranged to twist about as well as bend along its longitudinal axis and in a manner which tends to decelerate the door as the door approaches its closed position.
20 Citations
6 Claims
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1. A closure device for a door which is hingedly mounted to a door jamb comprising:
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a torsion bar connected at one end at a first location to the door jamb and at its other end, at a second location, to an adjacent portion of the door; the distance between said first and second locations, when the door is closed, being less than the length of the torsion bar whereby said bar will be attached in a manner such that when the door is open the bar will extend along a straight line from said first to said second locations, whereby when the door swings toward its closed position, the bar will bow in a direction which will generate a force tending to bias the door toward an open position; the bar being installed in a pre-loaded torsion condition which will tend to maintain the door in its closed position when the door is closed, said torsional force of the bar and force from the bowing of the bar being directed opposite each other whereby as the door approaches its closed configuration, the progressive bowing of the bar will progressively tend to decelerate the door. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification