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:
Dec. 14, 1999
Filed:
Nov. 20, 1997
Harry Gene Rickard, Phoenix, AZ (US);
Ryobi North America, Inc., , US;
Abstract
A compression release mechanism for a combustion chamber in an internal combustion engine comprises a pressure relief valve assembly and a control member. The valve assembly includes a valve body and a plunger cooperating with a vent passageway through the valve body to selectively allow pressure relief through the vent passageway. The control member cooperates with the plunger and is movable between an engaged position in which the control member urges the plunger toward the open position, and a disengaged position in which the plunger is held in the closed position. When the control member is engaged, the plunger oscillates between the open and closed positions in response to combustion chamber pressures during a combustion cycle which facilitates engine start-up while the compression release mechanism is engaged.