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:
Dec. 02, 1986
Filed:
Mar. 21, 1985
Casimir Z Cwirzen, Arlington Heights, IL (US);
Northern Telecom Limited, Montreal, CA;
Abstract
A three electrode gas tube protector has a central electrode and a line electrode positioned on each side, with a gap between each line electrode and the central electrode, the gaps being at a subatmospheric pressure. Connecting to each line electrode, in an axial arrangement, is a ground assembly having two coaxial conductive cups, their bottom ends spaced by a fusible member. A contact member is positioned within the inner cup and has a head and a stem. Around the stem is a compression spring, the stem passing through the bottoms of the cups and the fusible member. The end of the stem extends over the outer surface of the outer cup bottom, as by riveting. The spring is constrained between the bottom of the inner cup and the head of the contact member. On melting of the fusible member, the inner cup moves axially in the outer cup and a radially extending member, such as a flange or other, moves into contact with a ground member in a support structure.