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:
Jun. 11, 2013
Filed:
Jul. 08, 2008
Avinash R. Manubolu, Edwards, IL (US);
Shriprasad G. Lakhapati, Peoria, IL (US);
Stephen Lewis, Chillicothe, IL (US);
Christopher D. Hanson, Washington, IL (US);
Avinash R. Manubolu, Edwards, IL (US);
Shriprasad G. Lakhapati, Peoria, IL (US);
Stephen Lewis, Chillicothe, IL (US);
Christopher D. Hanson, Washington, IL (US);
Caterpillar Inc., Peoria, IL (US);
Abstract
A valve assembly including an armature and a valve member that are coupled when the solenoid coil is de-energized but are decoupled after the solenoid coil is energized. A first spring biases the armature and the valve member to a closed valve seat position while a second spring having a smaller preload than the first spring biases the valve member to an open valve seat position. When the solenoid coil is energized, the magnetic force of the coil overcomes the force exerted by the first spring pulling the armature away from the valve member. The valve member moves to the open valve seat position by the force exerted by the second spring. When the coil is de-energized, the magnetic force decays, thereby allowing the armature and the valve member to re-couple.