US2676530A - Exhaust fan - Google Patents

Description

P 27," 1954 s. M. BERNSTEIN 2,676,530

EXHAUST FAN Filed Dec. 1a, 1947 2 Sheets-Sheet 1 flI/lllll 17/5. Bel/ 145724192,

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s. M. BERNSTEIN EXHAUST FAN Apr-i127, 1954 2 Sheets-Sheet 2 Filed Dec. 18, 1947 Patented Apr. 27, 1954 UNITED STATES PATENT OFFICE EXHAUST FAN Samuel M. Bernstein, Chicago, Ill. Application December 18, 1947, Serial No. 792,562

1 Claim. 1

The invention relates to exhaust fans and more particularly to fans provided with a shutter.

In installing exhaust fans with shutters according to standard practice a double installation is necessary by first securing the blower in proper position and subsequently attaching the shutter.

According to my invention it is an object to provide an exhaust fan to which the shutter is already secured so that a simplified and expeditious method of installing the unit is afforded.

It is a further object to provide the frame of the fan with means for readily attaching the shutter to the frame so as to provide an operable unit.

It is also an object to provide certain features of construction and arrangement of parts tending to enhance the utility and efficiency of a device of the character specified.

With these and other objects in view which will become apparent from a disclosure of the invention, the latter comprises the means described in the following specification, particularly pointed out in the claim forming a part thereof, and illustrated in the accompanying drawings, in which Fig. 1 is the front view of an exhaust fan constructed in accordance with my invention,

Fig. 2 is a rear view thereof.

Fig. 3 is an enlarged section on the line 3-3 of Fig. 1.

Fig. 4 is an isometric view of the frame, only.

Fig. 5 is an enlarged section on the line '.i5 of Fig. 3. 4

Fig. 6 is a fragmentary isometric view of a corner of the frame.

Referring to the several views of the drawing [0 designates a wall in which an opening H is provided with a wooden frame l2.

A front plate I3 is secured to the wooden frame by screws M and is provided with a large circular opening l5, the edge of which is bent inwardly to form a circular flange I6.

To the front plate [3 is secured as at IT a horizontal arm l8 which is bent upwardly to form a support [9 for a platform 20.

Bracket arms 2! and 22 leading from the platform to the front plate further maintain the platform in functional position.

A motor 23 having a base 24 is secured by bolts 25 to the platform.

The motor shaft 26 carries at its free end a fan 21.

The parts thus far described do not per se form a part of the invention.

To the outer side of the front plate (Fig. 4) is secured a rectangular frame 23 made up of four angle irons 28A one leg 28B of each of which is welded to the front plate or secured in any other preferred or approved manner, so that the angles lie end to end in a rectangular array, while the remaining sides or legs of the several angles all project outwardly to define a square fiange to fit into the opening of the wall l0.

A Z-bar 29 is secured to the upper side 30 of the frame and a vertical channel member 3| (Fig. 6) is secured to each side member 32 by screws 33.

Each channel member is provided with a plurality of vertically spaced openings 34, and the pivot openings of both channel members are in horizontal registry.

Pivot rods 35 (Fig. 5) are journaled in appertaining pairs of openings 34 of the channel members and have rigidly secured thereto louvers or shutter plates 36 in overlapping relation to form a shutter 3! which closes when the fan is not running to shut out back fiow and weather.

A vertical link bar 38 is connected by diagonally and rectangularly offset arms 39 to each louver so that the opening and closing movements of said louvers are synchronized as will be readily understood by those versed in the art.

It is evident that the blower and shutter when assembled may be handled as a unit and thus facilitate installation and removal from the wall opening.

The method employed in assembling the blower and shutter eliminates labor in installing as compared with the present day practice of individually installing the blower and subsequently the shutter,

While the drawing shows one embodiment of the invention, numerous changes and alterations may be made without departing from the spirit of the invention.

I, therefore, wish to include all modifications, rearrangements and revisions constituting departures within the scope of the invention, as defined in the appended claim.

I claim:

In an exhaust fan structure, a rectangular plate adapted to fit over a wall opening and having a round central aperture; a mounting bracket for a motor fan secured on one side of said plate in alignment with said aperture; a rectangular flange defining a shallow frame on the opposite side of said plate from said mounting bracket and surrounding said aperture, said plate and frame flange defining a shallow compartment; and a set of pivoted louvers mounted in said shallow compartment to extend fully across the same, each louver having pintle means at opposite ends thereof, a channel member on the inside of each one of a pair of opposite portions of said rectangular flange and respectively having said pintle means seated therein; together with an annular baffle flange on said plate and surrounding said aperture and projecting into said shallow compartment but having its innermost margin terminated short of said louvers so as not to obstruct the free pivotal movement of the louvers.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,525,649 Ilg Feb. 10, 1925 1,532,635 Osbun Apr. 7, 1925 Number Number Name Date Nielsen Jan. 1, 1929 Nuttall June 4, 1929 Scott June 3, 1930 Frank May 1, 1934 Melin Jan. 19, 1937 Hueglin June 22, 1937 Hueglin Apr. 26, 1938 Benson Jan. 7, 1941 Denman June 29, 1943 Bird Aug. 8, 1944 Cooper Jan. 4, 1949 Lehman Apr. 29, 1952 FOREIGN PATENTS Country Date Germany Apr. 21, 1933 France May 20, 1935

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