David O Shumate

US Patent:

D636409, Apr 19, 2011

Filed:

Jul 21, 2009

Appl. No.:

29/340536

Inventors:

Darrin W. Wilmes - Cincinnati OH, US
Berlie E. Parks - Lawrenceburg IN, US
David O. Shumate - Lawrenceburg IN, US
Douglas R. Harper - Harrison OH, US

Assignee:

Campbell Hausfeld/Scott Fetzer Company - Harrison OH

International Classification:

1502

US Classification:

D15 9

US Patent:

8267666, Sep 18, 2012

Filed:

Mar 9, 2010

Appl. No.:

12/719898

Inventors:

Christopher Gruber - Cincinnati OH, US
David O. Shumate - Lawrenceburg IN, US
Steven R. Salmons - Saint Louis MO, US
Jeffrey P. VanHorn - Saint Louis MO, US

Assignee:

Campbell Hausfeld/Scott Fetzer Company - Harrison OH

International Classification:

F04B 49/00

US Classification:

417 26, 137223, 137227, 13763022, 1375122, 13711806, 137107, 417 442, 417303

Abstract:

An apparatus includes a valve housing having an inlet port, a first chamber with a first outlet port, and a second chamber with a second outlet port. A first valve opens between the inlet port and the first chamber under a first level of pneumatic pressure at the inlet port. A second valve opens between the first chamber and the second chamber under a second, greater level of pneumatic pressure in the first chamber. A third valve opens between the second chamber and the first chamber under a third level of pneumatic pressure in the second chamber, with the third level being less than the first level.