US 1524145 A
Description (OCR text may contain errors)
C. G. MITCHELL ET AL ADJUSTABLE FRAME FOR VENTILATORS AND THE- LIKE Filed Aug. 5, 1922 Patented Jan. 2'2, i925.
UNITED STATES ma ns Parent curios.
CHARLES connon MITCHELL sun ononsn nnnnsr wnnnna, or MONTREAL, annnno, CANADA.
ADJUSTABLE FRAME FOR VENTILATORS AND THE LIKE.
Application filed August 5, 1922.
To all. whom it may concern.
Be it known that we, CHARLES Gonnon MITCHELL and GEORGE ERNns'r l i nnnnn, both subjects of the King of Great Britain. and
residents of the city of Montreal, in the Province of Quebec and Dominion of Canada, hereby declare that we have invented certain new and useful Improvements in Adjustable Frames for Ventilators and the like, of which the following is a full, clear,
and exact description.
This invention relates to new and useful improvements in adjustable frames for ventilators and the like, and the object of the invention is to provide a frame which will be adjust-able to suit any defects in the wall finish.
Another object is to provide a frame which will be easily placed into the wall before or after the final wall finish has been applied without damaging same.
it further object is to provide a frame from which the grille and box can be ren'ioved without interfering with or damagi ng the wall finish.
The method of installing grilles and the like at the present time is toprovide ducts in the wall for the reception of boxes. The box frames are formed of angle iron around which the sides of the boxes are bent. The grilles or gratings are then attached to the box frames by set screws or studs, the holes for which have to be drilled on the site which is an expensive and unsatisfactory method of construction. Difliculty is also found in aligning the box frames with the fare of the wall and any attempt at rem edying this condition results in interfering with the plaster finish, or the like, of which the wall is composed. A. still further difiiculty is found in fitting the sides of the boxes square with vertical and horizontal lines of the building.
In our invention we provide a cast frame which is set in the wall and provided with slots for the reception of the box, and holes for the set screws or studs which hold the grille. The box is provided with straps extending from the sides of the box, said straps being positioned to pass through slots cut in the frame. Set screws are provided to set the box square and the straps when bent over the frame hold the box in position. The frame is provided with a re cess to receive the end of the straps and to Serial No. 579,893.
keep itflush with the inside of the frame, thus forming no obstruction to the passage of air through the box. The grille is provided with holes which coincide with the holes in the frame and isattached by screws or studs to the frame.
In the drawings:
Figure l is a perspective view looking on the front of the adjustable frame.
Figure 2 is a perspective view looking on the back of the adjustable frame.
Figure 3 is a fragmentary sectional view of the device.
Figure 4 is a fragmentary view of the corner of the frame showing the slots, recess for straps and holes for set screws.
Fig. 5 is a fragmentary perspective view, showing the construction of the box frame and the straps attached thereto.
Figure 6 is a perspective view of the box showing straps, set screws and fixing holes.
Referring more particularly to the drawings, 11 designates the adjustable frame which. is placed in the ducts cut in a wall 12. The frame is of rectangular construction having a short leg 13 and a long leg 14. The long leg 14: is slightly tapered to form a tight fiton the box 15 when placed in position. Slots 16 are provided in the angle of the frame to receive the straps 17 which are riveted or otherwise secured to the box'15. The set screws 18 are tapped into the face of the box and can be adjusted to suit any thickness, or variation of thickness, of the wall. The straps 17 are bent around the corner 19 of the frame and fit into recesses 20 cut in the inside of the long leg of the frame, thus forming no obstruction to the passage of air through the box, and also providing a means for attaching the box to the frame. To hold the frame in position a ridge 21 is cast in the short leg of the frame to form a key in the plaster of Paris, or the like material, of which the wall is constructed. The grille 22 is placed on the face of the frame and is held in position by bolts or set screws passing through the openings 23. To provide an air tight joint; between the grille and the frame a strip of felt 24, or the like, is placed between the engaging faces of the grille and the frame. Referring to Figure 6, this shows one modification of the constr ction of the box. In Figure 5 the box shown is constructed of thin galvanized iron and the face 25 is bent as shown to provide thickness for attaching the set screws 18 thereto.
The method of attaching the device is as follows: Ducts are cut in the wall for the reception of the frame 11 and the box is placed around the long leg 14 of the frame. The set screws 18 are adjusted to suit the wall thickness. The straps 17 are placed through the slots in the frame. The straps are then out to suit and bent around the cor ner of the frame and into the recesses 20. The grille is then placed in position with packing between the frame and the grille to form an airtight joint. As will be seen from the foregoing description the device can be fitted to the wall before or after the final wall finish is applied.
By adjusting the screws 18, the distance between the face of the box and the frame may be ad usted before bending over the straps. This construction is especially adapted to facilitate theleveling up of the outer surface of the face of the frame, so that when the grid is placed in position, it will butt conveniently against the outer face of the wall, or in the case of flush constructiori grids, the outer face of the grid will be flush with the face of the wall. In the case of the flush construction, the plaster may be placed onthe wall after the space between the face of the box and the frame is filled with concrete or the like. the frame against the heads of the adjusting screws and allow a certain amount of leveling up to accommodate the uneven surface of the wall.
Having thus described our invention, what we claim is:
1. Ina device of the class described, frame provided with slots, :1 box with a flanged end, straps attached to the sides of said box and passing through said flanged end, and adapted to engage with the slots The straps hold in the frame, and adjustable screws for adjusting the box, said screws abutting with the inside face of the frame.
2. In a device of the class described, a frame with a flange, a ridge around the said flange for keying the frame to the wall, said frame having slots cut therein, a flanged box adapted to engage with the sides of said frame, straps attached to said box positioned to engage with said frame slots, and passing through the flange of the box, said frame having recesses in the inside thereof to receive the ends of the straps, adjustable screws in the flange of the box adapted to abut with the inside face of the frame flange, a grille, and means for attaching the grille to the frame.
In a device of the character described. the combination of a frame and a box providedwith opposing wall-engaging portions. adjustable members carried by one of said wall-engaging portions and adapted to abut the other wall-engaging portions and providing a means for leveling up the outer surface of the frame with respect to the wall surface, and means for securing the box and frame in adjusted position.
4. In a device of the character described. the combination of a frame, a box, opposing wall engaging flanges carried by the frame and box, adjustable spacing means carried by one of said flanges and engageable with the other flange to provide for leveling of the frame with respect to the wall surface and means for securing the box and frame in adjusted position consisting of straps car-- ried by the box and adapted to be bent about portions of the frame In witness whereof, we have hereunto set our hands.
CHARLES GORDON MITCHELL. GEORGE ERNEST VVEBBER.