Thermal measuring and testing – Temperature measurement – Nonelectrical – nonmagnetic – or nonmechanical temperature...
Patent
1993-10-07
1995-01-10
Gutierrez, Diego F. F.
Thermal measuring and testing
Temperature measurement
Nonelectrical, nonmagnetic, or nonmechanical temperature...
374141, 374148, 116217, G01K 1106, G01K 114, G01K 1302
Patent
active
053800923
ABSTRACT:
An apparatus is provided for indicating if the temperature of a fluid within a machine has surpassed a critical temperature. An integrally formed support of a rigid material able to withstand the critical temperature includes a head and a cavity formed within the head. The head provides a hexagonal nut such that a standard socket wrench or other wrench may be used to engage and rotationally drive the head of the device. An engagement shaft extends from the head and provides an external machine screw thread that enables engagement of the shaft within a complimentary threaded hole in the machine. The shaft further includes an axial bore that extends from a distal end of the shaft, through the shaft, and terminates adjacent to the cavity within the head. A temperature indicator is made of a material having a melting temperature equal to the critical temperature and is bonded within the cavity such that the support means and the indicator means are in good thermal contact. As such, when fitted into the machine, the indicator is maintained at the temperature of the fluid. If the fluid temperature exceeds the critical temperature, the indicator will melt, thereby indicating to a person looking into the cavity that the fluid in the machine had surpassed at least the critical temperature.
REFERENCES:
patent: 1357302 (1920-11-01), Schiefer
patent: 1374857 (1921-04-01), Linebarger
patent: 2829185 (1958-04-01), Macatician et al.
patent: 4016762 (1977-04-01), Payne
patent: 4325254 (1982-04-01), Svacina et al.
patent: 4818119 (1989-04-01), Busch et al.
patent: 4904091 (1990-02-01), Ward
"Heat Tabs" Product No. 1193, Hastings Catalog #320, p. 81 (no date).
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