David A Mcgrath

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:

20050242318, Nov 3, 2005

Filed:

Apr 30, 2004

Appl. No.:

10/709378

Inventors:

Ronald Maxwell - Irving TX, US
David McGrath - New Braunfels TX, US

Assignee:

SENIOR INVESTMENTS AG - 8200 Schaffhausen

International Classification:

F16K001/16

US Classification:

251361000

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 liner 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.