PNEUMATIC DOOR CLOSER

• US 3,593,367 A
• Filed: 08/15/1969
• Issued: 07/20/1971
• Est. Priority Date: 08/15/1969
• Status: Expired due to Term

• Current Assignee: Stanley Works Limited (Stanley Black & Decker, Inc.)
• Original Assignee: Russell W. Waldo
• Inventors: Waldo, Russell W.
• Application Number:
  US04/850,578
• Time in Patent Office: 704 Days
• US Class Current: 16/66
• CPC Class Codes: E05F 3/02 with pneumatic piston brakes rotary type E05F3/14
• CPC Class Codes: E05Y 2900/132 Doors

Abstract

Piston means in a pneumatic door closer and including a body structure defining a radially outwardly opening annular channel having axially spaced sidewalls, a sealing ring movable axially toward and away from one of the sidewalls, and a porous lubricating ring disposed between the other of the sidewalls and the sealing ring. Both rings frictionally engage the cylindrical surface of an elongated casing in which the piston means is axially movable. The piston means includes a pair of cooperating elements welded together and to the inner end of a plunger rod which extends axially outwardly of one end of the casing.

Claims

1. A pneumatic door closer comprising:

a. an elongated casing having an inner cylindrical wall surface, a closure member at one end, and an axial opening at its other end;

b. a plunger rod extending axially through said axial opening for movements axially of said casing and having inner and outer ends respectively within and axially outwardly of said casing;

c. means on said plunger rod outer end and said closure member for connection one to a doorframe and the other to a door hingedly mounted in the doorframe;

d. piston means on the inner end of said plunger rod comprising;

1. body structure including a disclike washer element having a flat radial wall portion and air passage means extending in a direction axially therethrough, and a generally cup-shaped valve seat element having a conical wall portion diverging radially outwardly with respect to said flat radial wall portion and defining therewith a radially outwardly opening annular channel, the body structure having radially outer marginal portions inwardly spaced from said cylindrical wall surface, said washer element being disposed between said valve seat element and said closure member;

2. a sealinG ring in said channel concentric with and in close fitting sliding engagement with said inner cylindrical wall surface and movable toward and away from sealing engagement with said conical wall portion;

3. and a porous lubricating ring in said channel in closely fitting sliding engagement with said cylindrical wall surface axially adjacent said sealing ring and positioned to engage said flat radial wall portion;

4. said channel having an axial dimension greater than the combined axial dimension of said sealing and lubricating rings to permit limited axial movement of said body structure relative to said rings e. and yielding means in said casing urging said piston means and plunger rod in a door-closing direction toward said closure member;

f. said valve element being formed to provide an axial hollow boss defining a recess for reception of the inner end of valve seat plunger rod, said inner end of the plunger rod and said washer being welded to said boss. 2. The door closer defined in claim 1 in which said washer element includes axially projecting flange means telescopically received over said boss to axially align said washer element with said valve seat element.

2. a sealing ring disposed in said channel in closely fitting sliding engagement with said inner cylindrical wall surface and foR axial movements relative to said body structure toward and away from axial abutment with said generally conical wall;

3. and a porous lubricating ring in said channel in closely fitting sliding engagement with said inner cylindrical wall surface, said lubricating ring being disposed for axial movements between axially abutting relation with said sealing ring and said flat radial wall;

4. said channel having an axial dimension greater than the combined axial dimension of said sealing and lubricating rings to permit limited axial movement of said body structure relative to said rings e. and yielding means in said casing urging said piston means and plunger rod in a door-closing direction toward said closure member;

f. said valve element being formed to provide an axial hollow boss defining a recess for reception of the inner end of valve seat plunger rod, said inner end of the plunger rod and said washer being welded to said boss. 2. The door closer defined in claim 1 in which said washer element includes axially projecting flange means telescopically received over said boss to axially align said washer element with said valve seat element.

5. The door closer defined in claim 4 which said convex dimple surface has a radius of curvature less than that of the adjacent concave surface of said boss end wall to provide a substantially point contact therebetween.

6. The door closure defined in claim 3 in which said washer element is formed from sheet metal, said flange means comprising a plurality of circumferentially spaced tabs sheared and bent from said washer element in one direction axially thereof to provide portions of said air passage means, said stop lug means comprising a plurality of circumferentially spaced tabs sheared and bent from said washer element in the opposite direction axially thereof each alternately with a different one of said first-mentioned tabs to provide other portions of said air passage means.

7. A pneumatic door closer comprising:

a. an elongated casing having an inner cylindrical wall surface, a closure member at one end, and an axial opening at its other end;