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:
Feb. 14, 1978
Filed:
Sep. 16, 1976
Robert L Erwin, Farmington, NM (US);
Other;
Abstract
A tapered rotary valve plug fits into a tapered valve chamber and is rotated by an operating head or cap. Cam means are provided to automatically shift the operating head and valve plug axially as the head is rotated. A pin-and-slot connection between the operating head and valve plug is provided whereby rotation of the plug is delayed until the plug has been lifted from its seat, after which rotation of the plug takes place as rotation of the head is continued. Spring means, tensioned during the initial relative rotation of the operating head and plug, are provided for restoring head and plug to their original position relative to each other as soon as the valve plug has been loosened from its seat. Means are also provided for positively stopping rotation of the plug at full open or closed positions.