Power ventilator

• US 3,934,494 A
• Filed: 03/22/1974
• Issued: 01/27/1976
• Est. Priority Date: 02/23/1973
• Status: Expired due to Term

• Current Assignee: Henry N. Butler
• Original Assignee: Henry N. Butler
• Inventors: Butler, Henry N.
• Primary Examiner(s): Wayner, William E.
• Application Number:
  US05/454,005
• Time in Patent Office: 676 Days
• Field of Search: 98/43, 98/61, 98/81, 98/42, 52/63, 52/200
• US Class Current: 454/356
• CPC Class Codes: F24F 11/0001 for ventilation F24F11/30 takes precedence
• CPC Class Codes: F24F 7/025 with forced air circulation by means of a built-in ventilator

Abstract

Disclosed is a power ventilator attached to a roof for ventilating an attic or the like. The power ventilator is provided with a base which attaches to the roof adjacent an opening in the roof. The base has a hollow cylindrical housing which forms an air duct. A plurality of wire supports are used to attach a generally dome-shaped cover and an electrically powered fan and motor to the cylindrical flange. Each wire support has a curved portion which conforms with and contacts an arcuate portion of the cover. Each wire bracket has a flange which extends into the interior of the cylindrical flanged portion to support the fan motor. A screen is attached across the opening between the cover and the cylindrical flanged portion. A thermostat means is connected to the exhaust fan to operate the fan when the temperature in the attic exceeds a first predetermined temperature and disengages the fan when the temperature falls below a second predetermined temperature. A fire prevention means is provided to disengage the fan when the temperature in the attic exceeds a third predetermined temperature and engages the fan when the temperature falls below a fourth predetermined temperature.

Claims

1. 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 fan attached to said fan support flanges of said bracket means and the interior of said cylindrical flange causing air to flow from said base through said ventilator; and

screen means extending across the opening between said cover and said base for preventing undesirable objects from entering said ventilator.