Hydraulic door closer with fluid overflow chamber
AssigneeLarson Manufacturing Company of South Dakota, Inc.
InventorMichael W. Kondratuk
Life of this patent
Estimating the term…
Abstract
This disclosure is generally directed to a hydraulic door closer, and more specifically is directed to a hydraulic storm or screen door closer that has a fluid overflow chamber providing fluid volume and pressure control for both expanded and contracted fluid at different temperatures. The disclosed hydraulic door closer comprises a fluid overflow chamber adapted to hold sufficient fluid to maintain required operating fluid or oil levels at different temperatures, and to ensure proper closer performance under both extreme high and low temperature conditions.
Claims13
A hydraulic door closer comprising a housing filled with fluid fitted with i) a biasing spring attached to a piston having geared teeth and a check valve, ii) a geared pinion, iii) a speed control chamber, and iv) a fluid overflow chamber adapted to hold sufficient fluid when the fluid is in both an expanded and contracted state, the fluid overflow chamber comprising an overflow chamber piston, an overflow chamber piston seal, and an overflow chamber spring.
A hydraulic door closer comprising a housing filled with fluid fitted with i) a biasing spring attached to a piston having geared teeth and a check valve, ii) a geared pinion, iii) a speed control chamber, iv) a fluid overflow chamber having a predetermined volume sufficient to hold an expanded fluid at an elevated temperature, the fluid overflow chamber comprising an overflow chamber piston, an overflow chamber piston seal, and an overflow chamber spring.
A hydraulic door closer comprising a housing filled with fluid fitted with i) a biasing spring attached to a piston having geared teeth and a check valve, ii) a geared pinion, iii) a speed control chamber, and iv) a fluid overflow chamber, wherein the fluid overflow chamber comprises an overflow chamber piston, an overflow chamber piston seal, and an overflow chamber spring, and wherein the fluid overflow chamber maintains an amount of the fluid so that when the fluid contracts there is sufficient fluid in the closer.
Dependencies are inferred from the claim text.