The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 18, 2000
Filed:
Dec. 18, 1998
Thomas J Hajek, Jr, Lockport, IL (US);
Srikrishnan T Tolappa, Aurora, IL (US);
Caterpillar Inc., Peoria, IL (US);
Abstract
A control for a poppet valve providing improved load drift control is disclosed. The control includes a valve member operably moveable between a closed position and a range of open positions for allowing flow from an associated poppet control chamber, and a sealing element disposed between a first cavity portion in communication with the control chamber and a second cavity portion for preventing leakage around the valve member therebetween. The sealing element is supported by structure which maintains the sealing element in close alignment with a bore in which the valve member is supported, the sealing element in several embodiments being integrally formed with the bore and in other embodiments being self aligning with the bore.