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:
Jul. 22, 2008
Filed:
Sep. 08, 2004
Stéphane Gerbier, Occagnes, FR;
Ernst-peter Magens, Ammersbek, DE;
Frank Maenken, Henstedt-Ulzburg, DE;
Nis-georg Nissen, Brokstedt, DE;
Martin Von Werder, Ammersbek, DE;
Stéphane Gerbier, Occagnes, FR;
Ernst-Peter Magens, Ammersbek, DE;
Frank Maenken, Henstedt-Ulzburg, DE;
Nis-Georg Nissen, Brokstedt, DE;
Martin von Werder, Ammersbek, DE;
Jungheinrich Aktiengesellschaft, Hamburg, DE;
Abstract
Pump assembly for the lift cylinder of a hand fork-lift truck includes a piston pump activated by a bar of a hand fork-lift truck and has a piston chamber and an annulus collector. A three stage control valve connects the lift cylinder with a tank in the lowered setting and connects the piston chamber with the tank in a neutral setting and in a pump setting, connects the piston chamber with the lift cylinder through a first check-valve, with the tank through a second check-valve, a third check-valve between the piston chamber and the annulus collector open to the piston chamber, and a reversing valve between the piston chamber and the annulus collector.