US2225349A

US2225349A - Ventilating fan control

Info

Publication number: US2225349A
Application number: US254074A
Authority: US
Inventors: Harold F Morse
Original assignee: General Electric Co
Current assignee: General Electric Co
Priority date: 1939-02-01
Filing date: 1939-02-01
Publication date: 1940-12-17
Anticipated expiration: 1957-12-17

Description

Dec. 17, 1940. H. F. MORSE VENTILAIING FAN CONTROL Filed Feb. ,1 19:59

, Irv/ enter" Harold F IVIorse is Attovneg atented Dec. 17,. 1940 y ED STATES VATENT orrlca VENTILATING'FAN CONTROL 7 Harold F. Morse, Southport, Conn, assignmto General Electric Company, a corporation New York Application February 1, 1939, Serial 120.2543

2 Claims. (Cl. 98-116) tion attention is directed to the following de-' scription and the claims appended thereto.

In the accompanying drawing, Fig. 1 is a sectional side elevation of a. ventilating fan embodying my invention; Fig. 2 is a-front view of the fan partly broken away; Fig. 3 is a fragmentary view of the control, and Fig. 4 is a perspective view of the switch supporting bracket.

Referring to the drawing, there is shown an electric motor driven fan i mounted-in a circular opening or duct 2 in the outside wall 3 of a room. The motor of the fan is shown at la. The lining of the opening comprises inner and outer tele-,

wall. The inner end section is provided withan inwardly extending flange 8a to which are fixed supporting arms 8b fixed to a ring 9a. The ring 91; has-flexible arms 91) fixed thereto which resiliently supp rt the fan. Before mounting the fan, the sections 4 and 5 are secured together with the fan and-framemounted thereon, and the assembly is then inserted from the outside of the wall 3 to a position in which, ,the frame I rests against the wall surface.

At the upper end of the frame I is mounted a shaft Ill on which a door or shutter H is hinged. The shutter is biased to the open position shown in dotted lines in Fig. 1 by a coil spring l2 arranged around a rod l3 pivoted at M in-ears IS on the telescoping section 5. The upper end of a the coil spring bears against awasher IS on the rod, and the lower end of the-spring bears against a bracket I? through which the rod is slidable. Since the pivot point ll of the rod I3 is at the rear of the pivot III of rthe shutter, the spring always urges the shutter toward the open position. The movement of the shutter is limited by a washer l8 fixed on the rod l3.

The fan is controlled by a switch ls'lmounted on an arm 20 of a bracket 2| fixed-to the flange 8a., The switch is connected to the motor by suitable electrical conductors-not. shown. As shown more clearly in Fig. 3, the switch (here 55 shown diagrammatically) has an operating memher 22 which is biased by a spring 23 to the circuit closing position. In other words, when the operating member 22 is released, the switch is closed by-the biasing spring to start the operation of the fan.

5 The operation of the fan and the opening and 'closing of the shutter are controlled by a flexible pull member 24, such as a bead chain, connected at one end to the switch operating member 22 by means of a strain limiting tension spring 25 and extending therefrom through a guide 28 fixed to the inner telescoping section 4, over a pulley 21 carried in a bracket 28 on the inner side of the shutter H, and extending back through the guide 26 and through an opening 29 and a keyhole slot 30 in the bracket 2|. In effect the bead chain is looped over the pulley, one arm of the loop being connected to the switch operating member and the other arm of the loop'being extended to a position accessible to the operator. By pulling on the chain the operator shortens the loop and swings the shutter to the closed position. As shown in Fig. 1, the opening 29 may be provided with a, bushing 3|.

To close the shutter and stop the operation of the fan, the bead chain is moved into the enlargedportion of the keyhole slot 30 and is pulled downward until the shutter reaches the closed position. The bead chain is then moved into the narrow portion of the keyhole slot, which grips the bead chain between two of the beads and holds it in this position. Movement of the bead chain to this position closes the shutter and pulls the switch operating member 22 to the circuit opening position, stopping the fan.

To start the operation of the fan, the'bead chain is moved into the enlarged portion of the keyhole slot 30 and released. This releases the tension in the chain and permits movement of the switch operating member 22 to the closed position under its biasing spring 23, starting the operation of the fan. Since the shutter is on an outside wall of the building it may be held in the closed position by ice frozen around its edges which would prevent its movement to the open position under the action of the biasing spring l2. The starting of the fan will, however, blow warm air from the room against the shutter, melting the ice. As soon as the ice is melted the shutter moves to the open position under the faction of the biasing spring l2.

From the above description it is'apparent that the control of the switch and shutter is dependent I upon the tension in rather than the position of 5 may be used with varying wall thicknesses withthe bead chain and that the switch and shutter are capable of'independent operation.

The control has the further advantage that it out adjustment.

What I claim as new and desire to secure by Letters Patent of the United States is:

1. In a room ventilating fan, a duct, a shutter therefor biased to the open position, a part connected to and movable with the shutter, a fan for forcing air through the duct against the shutter,

a fan-controlling switch having an operating the force of the shutter biasing means to a pc. tion corresponding to the closed position'o! the shutter.

2. A room ventilator comprising, a duct ior conducting air through a wall, a shutter for closing the duct, means for biasing the shutter to an open position, a fan for blowing air through the duct against the shutter, a fan controlling switch, means biasing the switch to the position starting the fan, a flexible pull member for controllina' the shutter and switch, and operative connections between the pull member and the shutter and switchwhereby upon tensioning oi the pull member the switch is operated to shut oi! the fan and the shutter is closed and upon release of the tension in the pull member the switeh is operated to start the fan and the shutter is permitted to move to the open position under its biasing means.

HAROLD F. MORSE. ,3]