Improvements in snap-action electric switches

640,097. Thermal switches; press-button retractive switches. SIMPLEX ELECTRIC CO., Ltd. Oct. 7, 1947, No. 26880. [Class 38(v)] [Also in Group XXXII] The blade-spring of a dead-centre, snapaction switch comprises a flexible plate 15 and an S-shaped spring 16 secured together at each end, so that a fi...

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Bibliographic Details
Main Author DALZIEL THOMAS
Format Patent
LanguageEnglish
Published 12.07.1950
Subjects
BASIC ELECTRIC ELEMENTS
ELECTRIC SWITCHES
ELECTRICITY
EMERGENCY PROTECTIVE DEVICES
RELAYS
SELECTORS
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Summary:640,097. Thermal switches; press-button retractive switches. SIMPLEX ELECTRIC CO., Ltd. Oct. 7, 1947, No. 26880. [Class 38(v)] [Also in Group XXXII] The blade-spring of a dead-centre, snapaction switch comprises a flexible plate 15 and an S-shaped spring 16 secured together at each end, so that a fixed contact 23 and a contact 21 carried by the composite spring are normally in engagement. Depression of a button 39 acting on a bend 37 of the spring 16, initially urges the contacts together and then causes the spring 16 to snap over-centre against an adjustable stop 40, the contacts reclosing when the button is released. The stop 40 may be replaced by a second fixed contact. The spring 16 and plate 15 may take several forms (Figs. 4 to 9, not shown), (see Group XXXII). The fixed contact may be screwed into the upper limb of a terminal strip bent into " U " form, the lower limb having a clearance hole through which the contact passes. The terminal strip may also be in two parts, the contact being mounted on one part and the electrical connection being made to the other, resilient, part. The spring may be of bimetallic material or acted upon by a bimetal strip.
Bibliography:Application Number: GB19470026880