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:
Sep. 24, 1991
Filed:
Jul. 16, 1990
David L Anderson, Muskegon, MI (US);
SPX Corporation, Muskegon, MI (US);
Abstract
An electromagnetic variable force motor circuit comprising a solenoid including a coil, a pole piece associated with the coil and a ball armature. A spring urges the ball armature toward a first seat and away from the pole piece. A first chamber is provided adjacent the first seat, the ball armature and the first seat define a first orifice extending between the ball armature and the first chamber. A first passage provides supply pressure to the first chamber. A second orifice is provided in the first passage. A valve including a movable member responsive to fluid pressure is provided in the first chamber. A second passage provides supply pressure to the valve. A third passage provides control flow from the valve device. A fourth passage provides exhaust flow from the first chamber when the ball armature is moved away from the first seat such that the ball armature controls flow through the first orifice to the fourth passage upon excitation of the coil. The valve is operable to variably restrict flow in the second and third passages.