Vacuum motor

Details Vacuum motor Vacuum motor

1994-01-18

1995-06-27

Look, Edward K.

Expansible chamber devices

Bellows type expansible chamber

With separate biasing means

F01B 1900

Patent

active

054270138

ABSTRACT:
An improved vacuum motor for actuating heat, ventilating and air conditioning control systems (HVAC), which uses a conical spiral spring and a bonded connection between the housing and cap to reduce weight, size, cost and noise. The motor includes a bellows which forms an airtight compartment inside the motor housing with the cap and a plunger connected to the bellows. The conical spring biases the bellows to a fully expanded position. A negative pressure or vacuum in the air line connected to the housing causes the bellows to collapse and compress the spring. As the bellows collapses, the attached plunger is pulled axially into the motor housing. The movement of the plunger actuates the connected HVAC device.

REFERENCES:
patent: 2561957 (1951-07-01), Teague
patent: 3073348 (1963-01-01), Allen
patent: 3166658 (1965-01-01), Jennings
patent: 3613513 (1971-10-01), Johnson
patent: 3999449 (1976-12-01), Chana et al.
patent: 4056043 (1977-11-01), Sriramamurty
patent: 5249508 (1993-10-01), Hasgawa et al.

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