Thermally operated propeller assembly

Details Thermally operated propeller assembly Thermally operated propeller assembly

1983-10-19

1984-12-11

Yeung, James C.

Stoves and furnaces

Stoves

Heating

446 57, 374135, 374187, 116216, 416128, D21 93, F24C 100

Patent

active

044871937

ABSTRACT:
A temperature indicating propeller assembly comprises first and second propellers freely suspended one above the other on a common suspension wire for rotation by rising air currents. One propeller is of larger diameter than the other so that it commences rotation by air currents generated at lower temperatures than the other propeller. The assembly can be suspended over a domestic stove, for example, to indicate when the stove is operating at normal temperature by rotation of the one propeller, or when the stove is operating at an excessive temperature by rotation of both propellers.

REFERENCES:
patent: 137406 (1873-04-01), Belknap
patent: D268053 (1983-02-01), Kozlowski
patent: 549897 (1895-11-01), Carroll
patent: 671181 (1901-04-01), Cardella
patent: 994057 (1911-05-01), Claycomb
patent: 2235461 (1941-03-01), Miller

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