US2772332A

US2772332A - Room ventilator

Info

Publication number: US2772332A
Application number: US443879A
Authority: US
Inventors: Viola M Carlson
Original assignee: Individual
Current assignee: Individual
Priority date: 1954-07-16
Filing date: 1954-07-16
Publication date: 1956-11-27
Anticipated expiration: 1973-11-27

Description

1956 v. M. CARLSON 2,772,332

ROOM VENTILATOR Filed July 16, 1954 VIOLA M. CAZLSON INVENTOR.

mm WOW United States Patent ROOM VENTILATOR Viola M. Carlson, Barrett, Minn.

Application July 16, 1954, Serial No. 443,879

' 1 Claim. (Cl. ZOO-88) This invention relates to a room ventilator and has for its primary object to exhaust air from the interior of a room and discharge it to the external atmosphere.

Another object is to automatically control the period of operation of the exhaust fan and to automatically disconnect it from the source of power after it has operated for a selected period of time.

The above and other objects may be attained by employing this invention which embodies among its features an electrically driven exhaust fan mounted in a window, a, source of electrical energy having one pole thereof connected to one pole of the exhaust fan, a con tact lever mounted to move in an arcuate path and electrically connected to the opposite pole of the fan, yielding means supported adjacent the contact lever and operatively connected thereto for holding said lever retracted in its arcuate path, a thermally distortable latch arm mounted adjacent the contact lever and extending into the path of movement thereof for engaging the lever and holding it advanced in the arcuate path against the effort of the yielding means, a heating coil mounted adjacent the latch arm and electrically connected to the latch arm and to the opposite pole of the source of electrical energy for heating the latch arm and causing it to distort and disengage the contact lever to interrupt the flow of electrical energy through the fan and the coil, and remote controlled means mounted adjacent the contact lever for moving it against the effort of the yielding means and into engagement with the latch arm.

Other features include electromagnetic means mounted adjacent the contact lever for moving it against the eifort of the spring and advancing it into latching engagement with the latch arm, one terminal of the electromagnet being connected to one pole of the source of electrical energy, and the opposite terminal of the electromagnet being connected to the opopsite pole of the source of electrical energy through a remotely located push button switch.

In the drawings:

Figure l is a view of a wall showing a window therein with this improved fan mounted in the window and connected to a source of electrical energy with the remote control means spaced from the window; and

Figure 2 is an enlarged sectional view through the switch box for controlling the fan.

Referring to the drawings in detail, a room wall is provided with a conventional window in which is mounted a conventional electrically driven fan 12 having conventional extensible side wings 14 for closing the space between the fan and the stiles of the window, it being understood that the unit is adapted to rest on the window sill and to be engaged at its top by the lower sash of the window. The wall in which the window 10 is located is equipped with a conventional electrical outlet 16 which may be located adjacent the base board of the room or in any other convenient location near the window so that the electrical connections with the fan may be connected to the outlet 16. The structure so far 2,772,332 Patented Nov. 2'7, 1956 "ice described is conventional and forms no part of this in-.

vention except in conjunction therewith.

Mounted at any suitable location adjacent the fan 12 is an electrical switch unit designated generally 18 comprising a housing 20 having an end wall provided with vertically spaced insulated openings 22. Mounted on the opposite end wall of the housing 24} within the interior thereof and electrically isolated therefrom by a suitable insulator 24 is a horizontal contact lever 26 which is adapted to move in an arcuate path within the housing. A retractile coil spring 28 is stretched between the contact lever 26 and the top wall of the housing for retracting said lever upwardly. The spring 28 is connected to an eye 30 carried by but electrically isolated from the housing 20 by a suitable nonconducting element 32. The contact lever 26 is electrically connected to one side of the fan motor 34 by a conductor 36, while the opposite side of the fan motor 34 is connected to one side of the electrical outlet 16 by means of a conductor 33.

Mounted on the bottom wall of the housing 29 adjacent the free end of the contact lever 26 and extending into the arcuate path of movement thereof is a vertical thermally distortable latch arm 42 which is insulated from the housing 20. A heating coil 44 is mounted around the thermally deformable latch arm 42 and is connected at one end to the latch arm, while the opposite end is connected to a conductor 46 which leads to the side of the outlet 16 remote from that connected to the conductor 38. It will thus be seen that when the contact lever 26 is depressed to engage the lateral projection on the upper end of latch arm 42, electrical energy will flow from the source to which the conductor 46 is connected, through the heating coil 44 and thence through the latch arm to the contact lever 26 through the conductor 36 to the fan motor 34 and thus complete an electrical circuit through said fan motor during the period that the latch arm 42 remains in engagement with the contact lever 26.

In order to move the contact lever against the efiort of the spring 28 and into engagement with the latch arm 42, a vertical electromagnet 48 is mounted on the bottom wall of the housing 20 beneath the contact lever 26 which has an armature 50 which is adapted to be attracted downwardly by the electromagnet 43 when the latter is energized. One terminal of the electromagnet is connected through a conductor 52 to the conductor 38, while the opposite terminal of the electromagnet 48 is connected through a conductor 54 with one terminal 56 of a push button switch 58, the opposite terminal of which is connected through a conductor to the conductor 46. It will thus be seen that when the push button switch 58 is closed, the electromagnet 48 will be energized to move the contact lever into engagement with the latch arm 42 beneath the projection 48 and thereby cause the fan motor 34 to be energized. The energization of the fan motor, of course, will cause the heating coil to be energized and after it has attained a predetermined temperature, the thermally distortable latch arm will move outwardly, as suggested in Figure 2, so as to disengage the latch arm projection 40 from the contact lever and permit the spring 28 to disengage the contact arm 26 from beneath the latch arm projection in) and thereby break the.circuit through the fan motor 34 and coil 44. Obviously, the breaking of the circuit through the coil 44 will cause it to cool and permit the thermally distortable latch arm 42 to return to its initial position in which the projection 40 extends into the arcuate path through which the contact lever 26 moves.

While in the foregoing there has been shown and described the preferred embodiment of this invention, it is to be understood that minor changes in the details of construction, combination and arrangement of parts may be resorted to without departing from the spirit and scope of the invention as claimed.

What is claimed is:

In a device of the character described, a support, a

vertical electroinagnet mounted on saidsupport, a vertical thermally distortable and insulated latch arm positioned alongside of said electromagnet, said latch arm having an upper end provided with a later-a l projection directed toward said electromagnetand a lower end secured to said support, an insulated horizontal contact lever overlying and spaced above said electroinagnet and having an armature thereon, said'contact lever having-an end pivoted on said support and providing for upward and downward swinging of said contact lever relative to the electromagnet and said latch arm, said contact lever having a free end normally securably and releasably e11- gaged under the latch arm projection in a depressed position of the contact lever, spring means acting between References Cited in the file of this patent UNITED STATES PATENTS 1,328,482, Baker Ian. '20, 1920 2,034,763 Landan Mar. 24, 1936 2,326,957 Maguire Aug. 17, 1943 FOREIGN PATENTS 106,323 Switzerland Sept. 16, 1924