Door lowering mechanism and method
AssigneeOverhead Door Corporation
InventorRobert C. Jones
Life of this patent
Estimating the term…
Abstract
An adjustable door braking system including a shaft, a brake pad configured to be mounted to the shaft, a plate configured to be mounted on the shaft adjacent to the brake pad, a spring, and a threaded adjustment piece. The spring is configured to be coiled around the shaft to urge the plate toward the brake pad. The adjustment piece is dimensioned and sized to be threaded on the shaft on a first side of the plate and is configured to adjust an amount of force with which the spring urges the plate against the brake pad disposed on a second side of the plate as the shaft rotates with respect to the adjustment piece.
Claims13
An adjustable door braking system comprising:
- a shaft;
- a brake pad configured to be mounted to the shaft;
- a plate configured to be mounted on the shaft adjacent to the brake pad;
- a spring configured to be coiled around the shaft to urge the plate toward the brake pad;
- a threaded adjustment piece dimensioned and sized to be threaded on the shaft on a first side of the plate and configured to adjust an amount of force with which the spring urges the plate against the brake pad disposed on a second side of the plate as the shaft rotates with respect to the adjustment piece;
- and
- a stationary seat configured to allow the adjustment piece to move axially along the shaft and to prevent the adjustment piece from rotating with the shaft.
An adjustable door braking system comprising:
- a shaft;
- a brake pad configured to be mounted to the shaft;
- a plate configured to be mounted on the shaft adjacent to the brake pad;
- a spring configured to be coiled around the shaft to urge the plate toward the brake pad;
- a threaded adjustment piece dimensioned and sized to be threaded on the shaft on a first side of the plate and configured to adjust an amount of force with which the spring urges the plate against the brake pad disposed on a second side of the plate as the shaft rotates with respect to the adjustment piece;
- a limiter for limiting the amount of force with which the spring urges the plate against the brake pad;
- and
- a second spring configured to urge the limiter against a bracket.
A method of applying a variable amount of braking force to a door based upon a speed of the door or a position of the door, the method comprising:
- attaching a brake plate and a brake pad disposed on a first side of the brake plate to a shaft;
- configuring a spring coiled around the shaft to urge the brake plate against the brake pad;
- threading an adjustment piece to the shaft on a second side of the brake plate;
- and
- configuring a stationary seat to allow the adjustment piece to move axially on the shaft as the shaft rotates with respect to the adjustment piece and prevent the adjustment piece from rotating with the shaft to thereby vary a force with which the spring urges against the brake plate.
Dependencies are inferred from the claim text.