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. 27, 1978
Filed:
May. 20, 1977
Eric K Thorson, Seattle, WA (US);
Eldec Corporation, Lynnwood, WA (US);
Abstract
An electrical indicator is disclosed of the type including a housing with an elongated window therein, and an elongated scale and an adjacent, relatively-translatable index carried on an elongated tape loop, both viewable through the window. The indicator provides increased resolution over such indicators known to the prior art by placing the elongated scale also on a tape which is made translatable past the window but in a direction opposite to that of the tape carrying the index. Both tapes are driven by the same drum forming part of a DC torque motor, but are taken off a peripheral surface of that drum in opposite directions to achieve opposite translations of the tapes past the window. An electrical circuit for controlling the DC torque motor is disclosed, as are details of the DC torque motor and associated components of the electrical indicator.