Method for making a hydraulic door closer having a one-piece mol

Details Method for making a hydraulic door closer having a one-piece mol Method for making a hydraulic door closer having a one-piece mol

1994-08-11

1996-07-16

Bray, W. Donald

Metal working

Method of mechanical manufacture

Prime mover or fluid pump making

16 62, 29428, 295271, 188285, 18832215, 18832219, 251 58, E05F 300, H01R 4300

Patent

active

055355145

ABSTRACT:
A method for making a hydraulic door closer includes the steps of molding material to form an elongated single-piece housing having a longitudinal cylindrical bore extending from a first open end thereof to a closed second end, a transverse intersecting bore, and mounting feet; installing a spring within the cylindrical bore at the closed end of the housing; installing a piston within the cylindrical bore in contact with the spring, the piston having a toothed rack thereon and an opening in each end to permit passage of fluid therethrough; installing a pinion gear in the transverse intersecting bore in meshed engagement with the toothed rack; installing an endplug with a port in the first end of the longitudinal cylindrical bore; and inserting a valve device through the port, for controlling flow of fluid through the piston, and for thereby controlling closing speed of the door. The single-piece housing as well as other components may be molded from metal or polymeric materials. Polymeric materials are preferred for their flexibility, lubricity, and moldability.

REFERENCES:
patent: 1178688 (1916-04-01), Stronach
patent: 3054136 (1962-09-01), Schlage et al.
patent: 3426383 (1969-02-01), Lasier et al.
patent: 3546734 (1970-12-01), Pollack et al.
patent: 3822438 (1974-07-01), Takenaka
patent: 4234996 (1980-11-01), Jentsch
patent: 4285094 (1981-08-01), Levings, Jr.
patent: 4386446 (1983-06-01), Zunkel et al.
patent: 4665583 (1987-05-01), Frolov et al.
patent: 5121686 (1992-06-01), Schonlau et al.

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