Power ventilator

Claim 2

A ventilator for a space or the like comprising: selectively operable means for moving air from the interior of said space; and temperature responsive means operatively associated with said air moving means for sensing the temperature in said space and for: a. operating said air moving means when the temperature in said space exceeds a first set temperature, b. continuing to operate said air moving means until the temperature in said space falls below a second set temperature; and, c. preventing operation of said fan when the temperature in said space exceeds a a third set temperature and continuing to prevent operation of said fan until the temperature in said space falls below a fourth set temperature, said third set temperature being higher than said first set temperature, said fourth set temperature being substantially lower than said third set temperature.

Claim 3

A ventilator as defined in claim 1 wherein said second set temperature is less than said first set temperature.

Claim 4

A ventilator as defined in claim 1 wherein said fourth set temperature is less than said third set temperature.

Claim 5

A ventilator as defined in claim 3 wherein said fourth set temperature is greater than said first set temperature.

Claim 6

A ventilator as defined in claim 1 wherein said first set temperature is approximately 100*F. and wherein said second set temperature is approximately 96*F., and wherein said third set temperature is approximately 250*F. and wherein said fourth set temperature is approximately 125*F.

Claim 7

A ventilator for installation on horizontal and inclined surfaces of roofs having an opening connecting with the space to be ventilated, comprising: cover means for protecting said opening; fan means for moving air Out of said space to be ventilated; thermostat means operatively associated with said fan means for sensing the temperature in said space operating said fan when the temperature in said space exceeds a first set temperature and for disengaging said fan when the temperature in said space falls below a second set temperature; and fire protection means operatively associated with said fan for sensing the temperature in said space and preventing said fan from operating when the temperature in said space exceeds a third set temperature and for continuing to prevent operation of said fan until the temperature in said space falls below a fourth set temperature said fourth set temperature being substantially lower than said third set temperature.

Claim 8

A ventilator for installation on horizontal and inclined surfaces of roofs having an opening connecting with the space to be ventilated, comprising: cover means for protecting said opening; fan means for moving air Out of said space to be ventilated; thermostat means operatively associated with said fan means for sensing the temperature in said space operating said fan when the temperature in said space exceeds a first set temperature and for disengaging said fan when the temperature in said space falls below a second set temperature; and fire protection means operatively associated with said fan for sensing the temperature in said space and preventing said fan from operating when the temperature in said space exceeds a third set temperature and for continuing to prevent operation of said fan until the temperature in said space falls below a fourth set temperature said fourth set temperature being substantially lower than said third set temperature.

Claim 9

A ventilator as defined in claim 6 wherein said second set temperature is less than said first set temperature.

Claim 10

A ventilator as defined in claim 6 wherein said fourth set temperature is less than said third set temperature.

Claim 11

A ventilator as defined in claim 8 wherein said fourth set temperature is greater than said first set temperature.

Claim 12

A ventilator as defined in claim 6 wherein said first set temperature is approximately 100*F. and wherein said second set temperature is approximately 96*F., and wherein said third set temperature is approximately 250*F. and wherein said fourth set temperature is approximately 125*F.

Claim 15

A ventilator for installation on horizontal and inclined surfaces of roofs having an opening connected with a space to be ventilated, comprising: a hollow support base with the interior of said base communicating with said opening, said support base having a first square-shaped flanged portion resting on the surface of said roof, a second cylindrical flanged portion extending transverse to the plane of said first flange, said first and second flanges being constructed from flexible material, a rigid frame reinforcing said first and second flange, a plurality of rigid feet extending from said frame, said rigid feet being attached to said roof; a generally dome-shaped cover for said support base, said dome-shaped cover having arcuate portions adjacent the periphery thereof, said cover being formed from a flexible material and a rigid frame; a plurality of bracket means for attaching said cover to said support base, said bracket means having an arcuate portion for contacting the arcuate portion of said cover, said bracket means being attached to the rigid frame of said cover and the rigid frame of said base, rigid feet extending from said bracket means, said rigid feet being attached to the roof, a fan support flange extending from one end of each of said bracket means into the interior of said cylindrical flange of said base; a selectively operable electrically powered fan attached to said fan support flanges of said bracket means in the interior of said cylindrical flange for causing air to flow from said base through said ventilator; screen means extending across the opening between said cover and said base for preventing undesirable objects from entering said ventilator; temperature responsive thermostat switch means for sensing the temperature in said space, said switch means being operatively associated with said fan for operating said fan when the air in said space exceeds a first temperaturE and for continuing to operate said fan until the temperature in said space falls below a second lower temperature; and temperature responsive fire-sensing switch means for sensing the temperature in said space and disengaging said fan when the temperature in said space exceeds 250* F. and for continuing to keep said fan disengaged until the temperature in said space again falls below 125* F., said thermostat switch means and said fire-sensing switch means being connected in series with said fan and a source of electrical power.

Claim 16

A ventilator for installation on horizontal and inclined surfaces of roofs having an opening connected with a space to be ventilated, comprising: a hollow support base with the interior of said base communicating with said opening, said support base having a first square-shaped flanged portion resting on the surface of said roof, a second cylindrical flanged portion extending transverse to the plane of said first flange, said first and second flanges being constructed from flexible material, a rigid frame reinforcing said first and second flange, a plurality of rigid feet extending from said frame, said rigid feet being attached to said roof; a generally dome-shaped cover for said support base, said dome-shaped cover having arcuate portions adjacent the periphery thereof, said cover being formed from a flexible material and a rigid frame; a plurality of bracket means for attaching said cover to said support base, said bracket means having an arcuate portion for contacting the arcuate portion of said cover, said bracket means being attached to the rigid frame of said cover and the rigid frame of said base, rigid feet extending from said bracket means, said rigid feet being attached to the roof, a fan support flange extending from one end of each of said bracket means into the interior of said cylindrical flange of said base; a selectively operable electrically powered fan attached to said fan support flanges of said bracket means in the interior of said cylindrical flange for causing air to flow from said base through said ventilator; screen means extending across the opening between said cover and said base for preventing undesirable objects from entering said ventilator; temperature responsive thermostat switch means for sensing the temperature in said space, said switch means being operatively associated with said fan for operating said fan when the air in said space exceeds a first temperaturE and for continuing to operate said fan until the temperature in said space falls below a second lower temperature; and temperature responsive fire-sensing switch means for sensing the temperature in said space and disengaging said fan when the temperature in said space exceeds 250* F. and for continuing to keep said fan disengaged until the temperature in said space again falls below 125* F., said thermostat switch means and said fire-sensing switch means being connected in series with said fan and a source of electrical power.

Claim 17

The ventilator of claim 1 wherein said selectively operable means comprises an electrically powered fan connected to a source of electrical power; and wherein said temperature responsive means comprises a first and second temperature responsive switches connected in series between said fan and said source of electrical power.

Claim 18

The ventilator of claim 6 wherein said fan means is electrically powered and is connected to a source of electrical power, and wherein said thermostat means and said fire-protector means are temperature responsive switches connected in series between said fan means and the source of electrical power.

Claim 19

The ventilator of claim 1 wherein said fan means is electrically powered and is connected to a source of electrical power, and wherein said thermostat means and said fire-sensing means are temperature responsive switches connected in series between said fan means and the source of electrical power.