Temperature limiting system for a spring loaded torque...

Details Temperature limiting system for a spring loaded torque... Temperature limiting system for a spring loaded torque...

A - Human Necessities

47

L

15/53.1

A47L 9/04 (2006.01)

Patent

CA 1273164

ABSTRACT A temperature responsive fuse is provided for use in a vacuum cleaner brush dowel drive clutch mechanism to prevent overheating of the clutch mechanism upon a continued rotation of the drive belt after the brush dowel has stalled due to jamming or similar occurances. The friction clutch is provided to prevent damage to the cog drive belt if the brush dowel becomes stalled and the fuse, which is a meltable spacer positioned between a loading spring and the engaging friction drive surfaces, is provided to prevent excessive heat build-up in the clutch mechanism in case a safety circuit, which normally detects stoppage of the brush dowel and deenergizes the dowel drive motor, should fail. The fuse spacer will melt at a temperature in the range of 300°F to 400°F to unload the spring thereby reducing friction between the engaging surfaces of the clutch mechanism and thus lowering the amount of heat generated.

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