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:
Mar. 07, 1989
Filed:
Oct. 02, 1987
Rod Smith, Seymour, TN (US);
Timothy L Oliphant, Federal Way, WA (US);
Charles E Stephens, Kent, WA (US);
National Seating Company, Vonore, TN (US);
Abstract
An air spring seat principally for buses, trucks, boats or other vehicles includes a manual air pump for inflating and deflating the air spring. The manual air pump includes a piston having a rearward air intake stroke, a forward compression stroke to deliver pressurized air through a check valve delivery and venting system to the air spring, a pressure stablized at rest position at the end of the compression stroke and a forward venting stroke from the at rest position mechanically to release air from the air spring through the check valve delivery and venting system. A floating seal carried by the piston provides a fluid tight seal between the piston and pump body during the piston compression stroke but permits air to move from the intake side of the piston to the compression side of the piston during the piston intake stroke. The piston movements are all controlled by a manual lever handle readily accessible to the seat occupant. The lever handle is nested adjacent the seat cushion in the at rest position of the piston, is pulled upwardly from the at rest position to effect the piston intake stroke, is pushed downwardly to the at rest position to effect the piston compression stroke, and is pushed further downwardly from the at rest position to effect the piston venting stroke. The manual air pump includes a check valve relief system to release pressurized air from the pump housing during the piston compression stroke when the air spring pressure equals a preselected maximum operating pressure.