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. 13, 1989
Filed:
Jun. 02, 1987
Hans-Christof Klein, Hattersheim, DE;
Peter Drott, Frankfurt am Main, DE;
Alfred Teves GmbH, Frankfurt am Main, DE;
Abstract
A power steering device for parking for automotive vehicles has a left-turn switch (11) and a right-turn switch (12) which are associated with the steering column (13) which, in case of the steering wheel's (14) not being operated, adopt a first position and which, in case of a left or a right turn of the steering wheel (14), adopt a second position and act on associated left and right turning angle valves (17, 18) via an AND-gate (15, 16) associated with each. Upon actuation of the left-turn switch or of the right-turn switch (11, 12) a hydraulic pressure source is connected correspondingly to a hydraulic energy-generating device (34) assisting the steering system and acting on the steering linkage (37). The steering-column (13)-and-steering-wheel (14) arrangement consists of two parts (13, 14) twistable relative to each other in a limited manner upon a turn of the steering wheel (14). A linking element (20) adjustable between two positions permits the two parts (13, 14) to be coupled nonrotatably in the mid-position by means of a positive connection. The speed-AND-gate (21) actuates a coupling relay (22), which acts on the linking element (20) in such a manner as to ensure that, in case of the release switches (19, 23) being actuated, the parts (13, 14) will be uncoupled. The left-turn and right-turn switches (11, 12) are only actuatable when the parts (13, 14) are uncoupled and when there is a relative torsion by an amount lying within the narrowly limited range.