US2926837A

US2926837A - Power roof ventilator

Info

Publication number: US2926837A
Application number: US671164A
Authority: US
Inventors: Robert B Coe
Original assignee: Trane Co
Current assignee: Trane Co
Priority date: 1957-07-11
Filing date: 1957-07-11
Publication date: 1960-03-01
Anticipated expiration: 1977-03-01

Description

March 1, 1960 R. B. coE 2, 26,837

POWER ROOF VENTILATOR Filed July 11, 1957 2 Sheets-Sheet. 1

Fig.1.

INVENTOR. ROBE R T B. CO E ATTO R N E YS March 1, 1960 R. B. coE

POWER ROOF VENTILATOR 2 Sheets-Sheet 2 Filed July 11, 1957 INVENTOR. ROBERT B. COE BY 2 Z AT TORN YS United States Patent Application July 11, .1957,= Serial *No: 671,164 4 Claims. ct. 230 -117? This'invention relates generally? topower ventilators and more particularly to roofventilators employing a centrifugal fan for drawing'air out'ofa'buildingL Itis" important that suehventilato'rs operate with a minimum amountof'vibration andnoise; It is also important that the framework-shall offer a minimum of! resistance to air flow. The unit should be so constructedtliat it maybe easily taken. apart for servicing, of the motor and the fan.

It is, therefore, an'object of this invention to provide.

a frame whichwill isolate the noise and vibration of the fan and motor from the base of theunit.

it is another object of the invention to provide a frame which offers little resistance to air How.

It is also an objectof this invention toprovide a'constructionwhich is inexpensive and easy to assemble and which is easily accessible for servicing and cleaning.

An illustrative embodiment of thisinvention is-shown in the accompanying drawings,.where in:

Figure l is an elevational view of a power roof ventil'ator with portions of'the hood, the wire framerand the bird screen removed to show the interior construction;

Fig. 2 is a plan view of the power roofventilatorwith the hood removed:

Figure 3 is an elevational view of the wire frame.

Figure 4 is a plan view of the wire frame.

. Figure 5 is a partial sectional view showing the mounting of the motor on the wire frame.

Figure 6 is a partial sectional view showing the mounting of the hood on the wire frame.

Figure 7 is a partial sectional view showing the mounting of the wire frame on the base.

A rectangular base member 10 is adapted to be mounted over an opening inthe roof of a building. A wire frame 12 is secured by bolts 14 to the base member 10. A motor support 16 is secured to the wire frame 12 by bolts 18 and the motor support 16 has the motor 20 secured thereto by thru bolts 22. A centrifugal fan impeller 24 is mounted on a shaft 26 of the motor 20 with the inlet of the impeller 24 in fluid communication with an orifice 28 onthe base member 10. The hood 30 is secured to the wire frame 12 by bolts 32.

Referring now more specifically to the wire frame 12, there are four leg members 34 having outwardly extending eyes 36 at their lower ends and inwardly extending portions 37 terminating in eyes 38 at their upper ends. More or less than four leg members may be used if desired. Horizontal

circular wire members

40 and 42 are welded to the members 34. A circular wire member 44 is welded to the eyes 38 of the leg members 34. Another circular wire member 46 is welded to the outer end of the portions 37 of the members 34.

Diagonal wire braces 48 are welded to members 34 and members 46 at their points of intersection, to the members 42, and to

members

40 and 34 at their points of intersection. Angularly between the leg members 34 are U shaped wire members 50 which are welded to the

members

44 and 46.

. late vibration and noise in the motor 20 from the wire The means for securing wire frame 12 on the base10 wil l now be described with reference to Fig. 7. A nut 52 is secured to the base 10 by riveting. A flangedhole low rubber'grommet 54 surrounds the nut 52 and supports the eye 36 of the wire. frame 12. A rubberwasher 56 is supported-on the nut 52 and bears against the eye 36 of the wire frame 12. A rigid washer 58 preferably.

of metal bears against the rubber washer 56. The bolt 14, which isinthreaded engagement with the nut 52,

may. beadjusted to compress the washer 56 and the grommet 54 antamount whichiwill isolate the noise and vibration inthe wire frame. 12 from the base 10. r

The mounting of the motor support 16 on thewire frame 12'will now be. described with reference toFig. 5.

The. bolt 18 hasa washer 60 and a washer 62 bearing against the eye 38. of the wire frame 12. Motor support 16'has holes 63 for receivnig grooved rubber grommets- 64 which. are mounted on bolts 18. A nut 68 is in threaded engagementrwith the bolt 18 and has the usual washer 70. Thenut 68 may be adjusted on the bolt 18' to compress the grommet 64 an amount sufficient to iso- Bolts-.32 extend through the U-shaped members 50 and have mounted thereon push-on nuts 72. Hood 30 has holes. 74 for receiving grooved rubber grommets 75. Nuts 76 are-in threaded engagement with bolts 32 and bear against the rubber grommets to compress the rubber grommets 75 an amount sufiicient to isolate the hood 30 from the noiseand vibration of the Wire frame 12. A screen. 78 in annular shape rests upon the base 10 and extends upwardly to-the inwardly extending portions37 of the leg members 34. The leg members 34 prevent the screen 78 from moving substantially out of concentricity with the shaft. 26. This screen 78 prevents birds or rodents from entering the building through the roof ventilator.

Although the

grommets

54, 64, and 75 and the washer 56 have been described as being made of rubber, it should be understood that they can be made of other resilient materials such as neoprene, felt, etc.

The grommet 64 prevents most of the vibrations generated by the motor and fan impeller from reaching the Wire frame 12. The wire frame 12 because of its resilient construction is efiective in dampening out vibrations transmitted to it by the motor support 16, so that such vibrations are not transmitted to the base 10. The grommet 54 and washer 56 provide additional means for preventing vibrations from reaching the base 10.

I claim:

1. A power roof ventilator comprising a base adapted to be mounted on a roof over a roof opening, said base having an orifice for the passage of air, upright wire leg about the orifice of said base, horizontal annular wire members welded to said upright Wire leg members at spaced intervals along said upright wire leg members, diagonal wire members each having one end welded to one of said upright wire leg members at its joint with one of said horizontal annular wire members and having its other end welded to another of said upright wire leg members at its joint with another of said horizontal annular wire members, a motor secured to the upper ends of said upright wire leg members, a motor shaft extending downwardly from said motor, a centrifugal fan impeller secured to said motor shaft in fluid communication with the orifice of said base, a hood secured to said upright wire leg members and extending downwardly over said motor and having its lower end open and spaced from said base to provide an outlet for the air discharged by said centrifugal fan impeller.

2. A power roof ventilator comprising a base adapted to be mounted on a roof over a roof opening, said base having an orifice for the passage of air, upright wire leg members secured to said base and being angularly spaced about the orifice of said base, horizontal annular wire members welded to said upright Wire leg members at spaced intervals along said upright wire leg members, diagonal wire members each having one end welded to one of said upright wire leg members at its joint with one of said horizontal annular wire members and having its other end welded to another of said upright wire leg members at its joint with another of said horizontal annular wire members, a motor secured to the upper endsof said upright wire leg members, a motor shaft extending downwardly from said motor, a centrifugal fan impeller secured to said motor shaft in fluid communication with the orifice of said base, a hood secured to one of said horizontal annular wire members and extending downwardly over said motor and having its lower end open and spaced from said base to provide an outlet for the air discharged by said centrifugal fan impeller.

3. A power roof ventilator comprising a base adapted to be mounted on a roof over a roof opening, said base having an orifice for the passage of air, upright wire leg members secured to said base and being angularly spaced about the orifice of said base, said upright wire leg members converging upwardly from said base; horizontal annular Wire members welded to said upright wire leg members at spaced intervals along said upright wire leg members, diagonal wire members each having one end welded to one of said upright wire leg members at its joint with one of said horizontal annular wire members and having its other end welded to another of said upright wire leg members at its joint with another of said horizontal annular wire members, a motor secured to the upper ends of said upright wire leg members, a motor shaft extending downwardly from said motor, a centrifugal fan impeller secured to said motor shaft in fluid communicationwith the orifice of said base, a hood secured to one of said horizontal annular wire members and extending downwardly over said motor and having its lower end open and spaced from said base to provide an outlet for the air discharged by said centrifugal fan impeller.

4. A power roof ventilator comprising a base adapted to be mounted on a roof over a roof opening, said base having an orifice for the passage of air, upright wire leg members secured to said base and being angularly spaced about the orifice of said base, horizontal annular wire members welded to said upright wire leg members at spaced intervals along said upright wire leg members, diagonal wire members each having one end welded to one of said horizontal annular wire members at its joint with one of said upright wire leg members and having its other end welded to, another of said horizontal annular wire members at its joint with another of said upright wire leg members, a motor secured to the upper ends of said upright wire leg, members, a motor shaft extending downwardly from said motor, a centrifugal fan impeller secured to said motor shaft in fiuid communication with the orifice of said base, a hood secured to one of said horizontal annular wire members and extending downwardly over said motor and having its lower end open and spaced from said base to provide an outlet for the air discharged by said centrifugal fan impeller.

References Cited in the'file of this patent UNITED STATES PATENTS 1,863,043 Johnson June 14, 1932 2,096,621 Skolfield Oct. 19, 1937 2,258,325 Hess et al. Oct. 7, 1941 2,332,552 Belanger Oct. 26, 1943 2,571,513 Ammerman Oct. 16, 1951 2,666,378 Ammerman Jan. 19, 1954 2,774,293 Jenn Dec. 18, 1956 2,795,388 Myers June 11, 1957 2,823,598 Jenn Feb. 18, 1958