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:
Oct. 11, 1988
Filed:
Jul. 16, 1987
Alfred Affa, Stein, DE;
Dr. Johannes Heidenhain GmbH, Traunreut, DE;
Abstract
An encased position measuring instrument for measuring the relative position of two objects comprises a housing, a measuring scale and a scanning unit. The measuring scale is scanned by the scanning unit which is connected to a fastening member by means of a connecting rod. The connecting rod moves through a frontal opening in the housing which is hermetically sealed by a sealing unit. To avoid undesirable constraining forces exerted on the connecting rod when the housing changes position, the sealing unit is fastened to the housing by means of rods or wires. These rods run parallel to the connecting rod and are rigid in the measuring direction but allow movement of the sealing unit at right angles to the measuring direction.