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:
Apr. 12, 2011
Filed:
Feb. 01, 2008
Nikolaus Martin Erlmann, Düsseldorf, DE;
Nikolaus Martin Erlmann, Düsseldorf, DE;
Spicer Gelenkwellenbau GmbH, Westendhof, DE;
Abstract
A longitudinal displacement unit includes a first shaft element including an outer face having a plurality of first grooves and a second shaft element having a through-bore that receives the first shaft element. The second shaft element has a plurality of second grooves opposite the first plurality of grooves. A sleeve-shaped cage is disposed between the first shaft element and the second shaft element for guiding rolling contact members that engage the first plurality of grooves and the second plurality of grooves. The cage is provided with through-apertures that are circumferentially distributed, extend parallel to the longitudinal axis, and include longitudinal ends. Pressure springs are disposed within the through-apertures and are loaded between the longitudinal ends thereof. At least one stop is associated with one of the shaft elements, against which the pressure springs abut after having passed through a free displacement path of the cage between the two shaft elements, which free displacement path is not loaded by the pressure springs.