Albert William Allan

US Patent:

44319517, Feb 14, 1984

Filed:

Jan 25, 1982

Appl. No.:

6/342527

Inventors:

Albert W. Allan - Raleigh NC

Assignee:

Westinghouse Electric Corp. - Pittsburgh PA

International Classification:

H02N 1000

US Classification:

318117

Abstract:

A resistance thermal unit for a thermal electric energy demand meter responsive to a variable electric quantity characterized by a dielectric housing having a pair of opposed chambers for accommodating a pair of thermal responsive bimetallic spiral springs wound on a common shaft, the springs being effective when heated to rotate the shaft in opposite directions, heating means including a heating element for each spring which element includes a flattened heat resistant dielectric core and an electric-resistant wire spirally wound on the core which wire is connected to spaced load terminals, and the assembly being disposed in a clearance space around each corresponding spring.