Gregory A Perkins

US Patent:

7413163, Aug 19, 2008

Filed:

Apr 30, 2004

Appl. No.:

10/709377

Inventors:

Ronald K. Maxwell - Irving TX, US
David F. McGrath - New Braunfels TX, US
Gregory Allyn Perkins - Bulverde TX, US

Assignee:

Senior Investments AG - Schaffhausen

International Classification:

F16K 31/44
F16K 3/00
F16H 1/04

US Classification:

251250, 251326, 454334, 74422

Abstract:

This invention discloses improvements to a damper of the type used in industrial applications to open and close ducts carrying noxious or corrosive materials, such as combustion by-products. The improvements include a linear rack and wheeled pinion system to raise and lower a damper blade plate and improvements to the seal cartridge to prolong the life of the seal membrane and to prevent galling between the blade plate and the seal cartridge or damper frame.

US Patent:

47461489, May 24, 1988

Filed:

Feb 27, 1987

Appl. No.:

7/019647

Inventors:

Gregory A. Perkins - San Antonio TX

Assignee:

Flexonics Inc. - Bartlett IL

International Classification:

F16L 2700

US Classification:

285114

Abstract:

A structure for restraining pressure thrust loads of a bellows joint while allowing angular rotation between two pipe ends is provided with a pair of toroidal limiting rings having a circular cross-section and stop rings on their inner circumference. The limiting rings are secured at an axial spacing and encircle the pipe ends. Shear lugs are fixed around each pipe end. The stop rings are engaged by the shear lugs to limit the axial expansion of the joint. The limiting rings are secured together by either two hinge arms or a gimbal ring. The gimbal ring uses two pairs of hinge arms, each at 180. degree. spacing and one pair offset 90. degree. relative to the other, with one pair of hinge arms securing the gimbal ring to one limiting ring, and the other pair of hinge arms securing the gimbal ring to the other limiting ring.