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:
Aug. 15, 2000
Filed:
Apr. 08, 1998
Peter Leonhardt, Altenstadt, DE;
Hygrama AG, Rotkreuz, CH;
Abstract
A pneumatic or hydraulic cylinder (1) includes a cylinder tube (3) consisting of a non-ferromagnetic material in which a piston moves. At least one longitudinal channel (9) is recessed in the outer surface of the cylinder tube in which a signal transmitter (8) is secured to scan the piston location without physical contact. A permanent magnet is located on the piston which activates the signal transmitter (8) by its magnetic field. A leaf spring (17) is provided to secure the signal transmitter (8) in the longitudinal channel (9) and is attached to the housing of the signal transmitter by means of a screw (12) and a nut (19) with an inclined surface (20) that moves outward against the wall of the longitudinal channel (9) when the screw is tightened and thus tightly clamps the signal transmitter (8). The attaching device, consisting of the screw (12) with nut (18) and leaf spring (17), and the signal lead (10) are positioned on the same end of the signal transmitter (8).