Vacuum motor
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United States of America Patent
Stats
-
Jun 27, 1995
Grant Date -
N/A
app pub date -
Jan 18, 1994
filing date -
Jan 18, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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