US2159498A - Ventilating apparatus - Google Patents

Description

atented May 23, 1939 v uNiTED STATES PATENT orrlCE VENTILATING APPARATUS f It 'ltichard G. Birkholz, Milwaukee. Wis., assignor.

by mesne assignments. to Midwest Manufacturl f Application Api-us'. 1931, serial N0.1s5,os7

a-.s claims. v A(ci. sas-11s) f The invention relates tofventilating apparatus, The'front plate has a large central air opening and has' for an object to provide an improved I3 of generally circular shape, and the outer face l Ventilating device having a fan 'and having movof the front plate has a pair of spaced forwardly able closure means whichis"a:tuated to open projecting flanges I9 and 20 near its margin '5 position whenever the lfan is running.' forming a channel 2i between them of generally 5 lAnotherr object of .theixfvention is to provide rectangular outline to receive a packing strip 22. improved `closure o f"fatii'ig:means for the ven- Caulking material 23 is inserted between the tilating device. l y f 'outer flange I9 and the front edge portions of the A further object is to provide a ventilating de- `casing to seal the joint between them and also 10.vice in whichrthe fan isplaced'between two movto seal the joint between the casing and a sur- 10 able closures to housethe fan, the closures being rounding trimming frame 24 of the building. f yco'njointly operable to open position. An outer door 25 has a marginal flange 26 A further object is' to provide a/ Ventilating dewhich seats in the channel 2i against the packvice which can readily be assembled and ining strip 22. The door is provided with lugs 21 l stalled, and which will vpermit easy access to the at its upper edge swingably supported on hinge 15 operating parts. pins 28 secured to forwardly projecting lugs 29 A further object ls to providea ventilatlng-deon the upper edge of the front plate i5.v A linvicewhich can` bel economically manufactured ing sheet 30 of heat-insulating material is suitand which is efficient in operation. ably fastened to the inner face of the door. The

2o vThe inventionfurther consists in the several door is operated as hereinafter described. 20 1 features hereinafter described and claimed'. The inner edge of the casing I0 is flush with In the accompanying drawing,`illustrating certhe surface of the plaster 3i at the inner building tain embodiments of the invention,` f wall,V the casing being preferably arranged near y Fig; 1 is a'sectional elevationy of a Ventilating the ceiling 32 of the room to be ventilated. A

device constructed in accordance with the invenrectangular door frame 33, preferably of sheet 25 tion, as the device appears when installed in a metal, is marginally flanged to bear against the building wall, doors of the device being shown plaster around the casing, and' has a flange 34 closed in full lines,and open positions of the doors which projects into the casing and defines a doorbeing indicated by dotted lines; way 35. The door frame 33 is secured in place y Fig. 2 is anl elevation of the device viewed from by screws 36 which are threaded into angle brack- 30 the intake side, parts being removed and broken ets 31 attached to the side walls of the casing by away and parts being shown in section; screws 38. A panelled door 39, preferably formed Fig. 3 is a sectional -View of the device taken of sheet metal, fits in the doorway 35 and has clip f along the line 3-3 of Fig. 1; angles 40 secured to its inner face and near its 35 Fig. 4 is a sectional view taken along the line upper edge. The door is swingably mounted on 35 4--4 of Fig. 2; hinge pins 4i which are secured to the flange Fig. 5 is a sectional view taken along the line 34 of the door frame and extend through the clip 5-5 of Fig. 2; angles 40.

Fig. 6 s a detail view of a door-operating mech- A pair of brackets 42 are mounted on the inner ansm, a d sidesof the upper and lower walls of the casing, 40.

Fig. 7 sis a view of the device modified for use and have detachably secured thereto by screws with an intake duct.l 43 the forked outer ends of a pair: of respective In the drawing. i0 designates a square casing. vertical motor-supporting arms u. The inner preferably formed 0f heavy-sage Sheet metal and ends of the arms are of semi-cylindrical, concave i5 of a size to t in a building wall between studs i i shape to i; about a fan motor 45; the arms being 45 of the wall, as indicated in 1 and 2.r The clamped about the motor by screws 46. The Casing iS here Shown t0 b@ SllDpOfGd by and bemotor shaft extends horizontally and carries a tween upper and lower headers i2 and i3 to fan 4l at its outer end disposed centrally in the which the upper and lower walls of the casing circular opening i8 of the front plate i5. When are respectively secured by suitable means, such the doors 25 and 39 are open, 'as hereinafter de- 50 as nails i4. f scribed, the fan exhausts the air from the room A cast metal front plate i5 ts within the to the outside atmosphere. front or outer end of thc casingand is provided A duplex wiring receptacle 48 is secured in the with corner lugs I6 and attaching lugs i1, the casing at one of the lower corner portions therelatter being riveted to the walls of the casing. of by screws 49. 'I'he fan motor has a cord 50 55 l the receptacle.

"knockouts52 (one being shown in Fig. 1) to with a plugl for detachable connection with The casing is provided with permit an armored cable 53 to be attached thereto at either the bottom Wall or the side wall thereof for conducting current to the receptacle. The cable is also -connected to a suitable wall switch 54 for controlling the motor.

The outer door 25 is urged to closed position by a coiled spring 55 which is anchored at its inner end on a bracket arm 56 secured to a sidewall of the casing, the other end of the spring passing through an opening 51 in the front plate l5 rand being secured to a rod-like connector 58, Fig. 5, which slidably fits in an opening 59 formed in the door. Theouter end of the connector is pivotally secured to anv arm or blade 80 which normally extends transversely of the connector and bears on the outer face of the door, being prevented from rotation by a stop 8I secured to the door. When access is'desired to the fan motor and other parts within the casing, the spring tension may be released by swinging'the arm 60 to horizontal position so that it may extend `into 25 the opening 59. The inner door 39 ls urged to its closed position by gravity.

The outer and inner doors are urged to open position by a door-operating mechanism now to be described. A housing 62 isse'curedby screws 30 63 to the lower portion of' the side wall of the shaft 1I carries a pinion 12 outside the housing meshing with a rack 13, the rack being held in mesh with the pinion by a headed screw 14 carrying a rack-engaging roller 15. The several lpinions and gears form a reversible speed-reducing transmission. 'I'he rack passes through a notched partof the opening I8 in the front plate I5, and one end of the rack is pivotally secured to a bracket 18 detachably secured by a screw 11 to the outerdoor I5. The other end of the rack carries a stop pin 18 to limit the outward movement of the rack and`door. A cord 519 is connected to the motor 84 and carries a plug 80 which is detachably plugged into the receptan cie 48. i v

A lever 8| is journalled on a bracket arm 82- secured to the side wall of the casing above the receptace 48. The short upper arm of the lever is connected to one end of a link 83, the link passing through an opening 84 in the front plate l5,

and the other end ofthe link being pivotally connected to a lug 85 on the outer door 25. The long lower arm of the lever 8l carries a roller 86 bearing on the inner face of the inner door 39. By this linkage the outer and inner'doorsl will be opened simultaneously. i

In the modified form of the invention shown in Fig, 7, the inner doorA and door frame of the device are omitted, and the fan casing I0 is mounted between floorjoists 81 of a building and adjacent the outer Wall of the building. A duct 88 between the joists has an end fitting within the fan casing, th'e outer'- end of the duct having an intake register 89 opening in the ceiling 90 of the room to be ventilated. The construction of the device is otherwisel the same as that of Figs.- 1 to 6.

. 15, whereupon the motor 64 stops. acter of the motor permits the motor to remain When the fan of the device of Figs. 1 to 6 is not operating, the doors 25 and 39 are both closed, the outer door being spring-urged against its seat 22 of packing material to exclude the Weather, and to prevent the entrance of foreign matterl and insects. The insulation 30 on the outer door minimizes heat transfer. The inner door also has an insulating effect and minimizes any condensation within the casing.

When lthe .switch 54 is closed, the fan motor starts in operation and simultaneously the dooroperating motor also starts in operation and drives the rack 13 through the speed-reducing transmission. The rack 13 is thereby impelled outwardly, opening the outer door 25 against the action of its spring 55 and also opening the inner door 39 by the linkage connecting the doors. The open positions of the doors are indicated in Fig. 4. The outward movement of the outer door` is limited by the rack stop pin 18 engaging the roller The charsafely in stalled condition for an indefinitely long period `and without excessive power consumption. The fan exhausts the vitiated or odorous air froml the kitchen or other room being ventilated, and the air c'urrent through the casing prevents the entrance of insects and also cools the fan motor and door-operating motor. When the switch 54 is opened the fan motor shuts down, andthe door-operating motor 64 is deenergized. The spring 55 then returns the outer door 25 to its closed position, and the inner door 39 returns to its closed position by gravity. The reversible transmission and motor E4 act to retard or brake the closing movement of the doors. In both opening and closing, the doors operate smoothly and slowly, and without jarring or jerking, so as to minimize wear and noise and to prevent crystallization and breakage of parts.

'Ihe operation of the apparatus of Fig. 7 is gen- 'erally the same as that of Fig. 1. The inner door, however, is ordinarily omitted from an installation`of the type shown in Fig. '1. Y

In assembling the device, the door-operating lmotor and its housing and attached cord are handled as one sub-assembly, and the fan motor andits supporting arms and cord are handled as another sub-assembly.l After mounting these sub-assemblies in the casing the cords are plugged into the duplex receptacle 48. Either-of these sub-assemblies can readily be removed for inspection, cleaning, or repairs. To remove the fan sub-assembly it is only necessary to loosen or detach the screws 43 and'pull out the plug 5| from' the receptacle. In cases where it is desirable or necessary to effect inspection or serv-'- icing from the outside, as in the installation illustrated in Fig. 7, it is preferable to release the spring tension at the connector 58, as hereinbefore described, and to release the screw 11 so as topermit wide opening of the outer door 25. Both the fan and door-operating mechanism can be removed from the outside.

What I claim as new and desire to secure by Leters Patent is: l

f In a Ventilating device, the combination of a casing, a door for said casing, door-opening mechanism including an electric motor and a speed-reducing transmission, a fan in said casing, an electric motor for said fan, means for conjointly controlling said electric motors, and yielding pressure means for closing said door when said first-named electric motor is deenergized, said transmission and first-named motor forming a retarder for limiting the rate of closing movement of said door by said yielding pressure means.

2. Ina Ventilating device, the combination of a casing, a plate secured in an end of said casf ing and having an air opening, said plate having an outwardly projecting flange adjacent its periphery to form a caulking channel with the edge of the casing, and said plate having a channel the outer wall of which is formed by said flange, packing material in said-last named channel to form a closure seat around said opening, and a r movably mounted closure engageable with said seat.

3. In a Ventilating device, the combination oi a casing, closure means for said casing, a fan in said casing, mechanismfior4 operating 'said closure means including a rotary electric motor and a speed-reducing,transmission, said motor moving said closure means to open vposition and remaining in energized but stalled condition while said closure means is in open position, and yielding pressure means for closing said door when said motor is deenergized, said transmission and motor forming a retarder for limiting the rate of closing movement of said door by said yielding pressure means.

4. In a Ventilating device, the combination of a casing, a pivotally mounted door forysaid casing, said door having an aperture, a spring for urging said door to closed position, and a spring connector slidable in said door aperture and longitudinally adjustable in said aperture from the exter spring ension from the exterior of said door.

5. In a Ventilating device, the combination of a casing, a pivotally mounted door for said casing, said door having an aperture, a door-closing spring, a spring connector slidable in said aper ture and having a slidable inner section secured to said spring and a pivotally joined outer section adapted to extend transversely of said inner section to engage the outer face oi' said door for `resisting spring tension, said outer section being alignable with said inner section and slidable in said aperture to release and reestablish the spring tension from the exterior of said door.

RICHARD G. BIRKHOLZ.A

of the door to release and reestablish thel`

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