Roger H Sandvik

US Patent:

40709469, Jan 31, 1978

Filed:

May 3, 1976

Appl. No.:

5/682192

Inventors:

Roger H. Sandvik - Eastlake OH
Richard G. Huebscher - Cleveland OH

Assignee:

Design & Manufacturing Corporation - Willoughby OH

International Classification:

F15B 1522
F01B 1904
F16J 302

US Classification:

91 25

Abstract:

The actuator piston has a generally cylindrical central projection about the exterior of which a similarly formed rolling diaphragm is closely fitted. The piston rod can turn freely, to avoid any twisting of the piston and diaphragm, and can also be axially withdrawn from its engagement with the piston. Return spring means extends into the diaphragm enclosed part of the piston.