Claims
- 1. A pneumatic door closer comprising
- (a) a cylinder element having a movable internal piston equipped with a rod element extending through an opening in one end of said cylinder for extension and retraction, the opposite end of said cylinder having an air bleed opening;
- (b) a spring mounted in said cylinder urging said piston into a retracted position,
- (c) means adjacent the piston rod exiting end of the cylinder for pivotably attaching said cylinder to a door at a point on said door which is adjacent to said rod exiting end when said door is in the closed position, said attaching means comprising a mounting bracket attached to the door and an attaching bracket integrally connected to one side of the cylinder, said mounting bracket being pivotably connected to said attaching bracket,
- (d) means at end of said piston rod element for pivotably attaching the same to a door frame by means of a door jam bracket having a length less than about 11/2 inches, and
- (e) a resilient means extending from said means for pivotal attachment to the air bleed end of said cylinder which resilient means is adapted to push the air bleed end of said cylinder away from the door.
- 2. A device according to claim 1 wherein said resilient means is a leaf type spring.
- 3. A pneumatic door closer comprising
- (a) a rigid cylinder having a central opening in one end of said cylinder for passage of a rod that is adapted for extension and retraction, the opposite end of said cylinder having an adjustable air bleed opening,
- (b) a piston located within said cylinder having a seal, said piston being attached to said rod which extends through said opening in the cylinder,
- (c) a spring mounted within said cylinder around said rod urging said piston into a position wherein said rod is retracted,
- (d) means adjacent the end of said cylinder through which said rod extends for pivotably attaching said cylinder to a door at a point on said door which is adjacent to said rod exiting end of said cylinder in the closed position, said attaching means comprising a mounting bracket attached to the door and an attaching bracket integrally connected to one side of the cylinder, said mounting bracket being pivotably connected to said attaching bracket, a leaf spring attached to the mounting bracket and being positioned between the door and the cylinder to thereby exert a bending moment against the air bleed end of the cylinder, said leaf spring having a first end attached to the mounting bracket and a second free end which is in abutment with the air bleed end of the cylinder.
Parent Case Info
This is a continuation-in-part of copending application Ser. No 190,404 filed on May 5, 1988, now abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
628916 |
Bitne |
Jul 1899 |
|
1916571 |
Hoffman |
Jul 1933 |
|
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
190404 |
May 1988 |
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