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. 07, 1979
Filed:
Jun. 14, 1977
Hans Sauer, 8024 Deisenhofen, DE;
Matsushita Electric Works, Ltd., Osaka, JP;
Other;
Abstract
An electromagnetic relay comprises a coil bobbin of plastic material defining a protective tube, a contact chamber and a magnet chamber which together form a space that extends the entire length of the bobbin and is initially open at both ends. A permanent magnet is disposed in the magnet chamber, serving to seal one end of the space. This magnet has a surface exposed to the contact chamber and is made of a material activatable as a getter. A contact actuator is mounted to extend along the protective tube with a free end extending into the contact chamber. A pair of pole shoes each have a first end in proximity to the permanent magnet and a second end extending into the contact chamber. These second ends form fixed contacts for cooperating with the free end of the contact actuator. After assembly of these parts the space is subjected to a vacuum and an elevated temperature to drive off moisture and activate the getter. The vacuum is then replaced with an atmosphere of a protective gas, and the other end of the space is sealed with a closure.