Cylinder head bolt with temperature and contaminant indicator

1,086,445. Thermal switches; conducting liquid switches. GENERAL MOTORS CORPORATION. Sept. 15, 1966 [Sept. 27, 1965], No. 41285/66. Heading H2B. A cup-shaped part 20 of a metal switch housing 18 is welded in a cup-shaped recess 16 in a head bolt 10 secured in an I.C. engine cylinder head 12 and bloc...

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Bibliographic Details
Main Authors SHAW WILLARD C, BROWN WILLIAM E
Format Patent
LanguageEnglish
Published 05.12.1967
Subjects
BASIC ELECTRIC ELEMENTS
ELECTRIC SWITCHES
ELECTRICITY
EMERGENCY PROTECTIVE DEVICES
RELAYS
SELECTORS
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Summary:1,086,445. Thermal switches; conducting liquid switches. GENERAL MOTORS CORPORATION. Sept. 15, 1966 [Sept. 27, 1965], No. 41285/66. Heading H2B. A cup-shaped part 20 of a metal switch housing 18 is welded in a cup-shaped recess 16 in a head bolt 10 secured in an I.C. engine cylinder head 12 and block 14, and has secured therein by a washer 24 a bimetallic disc 22 that on overheating of parts 14, 12, 10, 22, is deflected into contact with a contact 36 carried by an insulator member 30 secured to the housing 18 by a peened-over portion 26 of the latter, and in circuit with an indicator lamp 40. In one form (Fig. 1) the housing has a resilient sealing ring (28). In Fig. 3, the housing 18 and member 30 have aligned apertures 52, 50 for the passage of engine lubrication oil to the disc 22 from the space 48 in the valve cover. Should the oil become contaminated with electrically conductive particles, the lamp 40 will operate intermittently as the particles complete a circuit between the disc 22 and contact 36, or housing 18 and a terminal 32.
Bibliography:Application Number: US19650490481