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US 4,542,815 AGranted
Air brake and retarder for gravity conveyors
AssigneeLear Siegler, Inc.
InventorHendrik Leemkuil
Life of this patent
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AssigneeLear Siegler, Inc.
InventorHendrik Leemkuil
Estimating the term…
A brake mechanism for controlling the velocity of articles on a gravity conveyor has a pneumatically operated actuator. During each cycle of operation of the brake a charge of air of limited volume is supplied to the actuator. The actuator is equipped with an air bleed which limits the actuator's period of action during each cycle. The charge of air is supplied by an accumulator, which is normally connected to a source of compressed air. An article actuated sensor and connected valve, upon being tripped by an article, isolates the accumulator from its air supply and connects it to the actuator activating the actuator but limiting its air supply to the charge stored in the accumulator before the valve was shifted by the sensor. The charge, once exhausted, is not replenished until the sensor is released by the article.
A pneumatic retarder for gravity conveyor, said retarder having a frame, an article engaging brake plate having a free end and pivotally mounted at its other end to the frame;
A pneumatic retarder for gravity conveyor having a plurality of rotatable article support elements, said retarder comprising:
A pneumatic retarder for gravity conveyor having a frame, a movable brake element, a pneumatic actuator for moving said brake element and means for sensing the presence of an article on the conveyor adjacent said brake element, said retarder characterized in that a pneumatic accumulator and a valve are mounted on said frame and engaged by said sensor, means connecting said valve to a source of compressed air and to said accumulator and said actuator;
Dependencies are inferred from the claim text.