US2808172A

US2808172A - Outlet box

Info

Publication number: US2808172A
Application number: US441134A
Authority: US
Inventors: Christopher C Buckels
Original assignee: Individual
Current assignee: Individual
Priority date: 1954-07-02
Filing date: 1954-07-02
Publication date: 1957-10-01
Anticipated expiration: 1974-10-01

Description

00L 1957 c. c. BUCKELS 2,808,172

OUTLET BOX Filed July 2, '1954 I I I l INVENTOR.

United States Patent OUTLET BOX Christopher C. Buckels, Chicago, 111.

Application July 2, 1954, Serial No. 441,134

7 Claims. (Cl. 2203.4)

The invention relates to the electrical wiring art and more particularly to a new and novel outlet box arrangement.

As is well known to those skilled in the art and particularly to those familiar with the electrical wiring of new building construction, conduit, outlet boxes and other electrical service facilities are installed in the building immediately after masonry work and rough partitioning are completed. Subsequent to the rough electrical installation, construction is continued with the lathing and plastering operations. Electrical service is not completed until some point near the finish of the building when the wires are pulled through the conduit, the circuits completed, and connection made to the main. It has been found through long experience that this order of work progression is in the interest of economy from the standpoint of overall construction costs. However, this order of work progression results in considerable difiiculty to the completing of the electrical wiring job. These difficulties can best be understood by a brief description of the practices of various building tradesmen.

When the electrician is completing his rough layout he locates his outlet boxes (said boxes being commonly known as 1900 boxes) and secures same to the roughly partitioned wall. Thereafter, the lather covers the studs usually by nailing rock lath thereto. In placing the outlet boxes on the studs, the electrician, if he is competent, will secure the box to the studs so that the box, when equipped with a mounted plaster cover, will fall just below the plane surface of the finish plaster when it is installed. Often however, the electrician errs and installs the box in such a manner that it is too deeply recessed in the finished wall. Even when the box has been correctly installed in the first instance, it is the standard lathing practice to locate the lath on the wall in correct position on the wall and strike the lath a firm blow which drives the inwardly facing surface of the lath against the open edges of the outlet box and plaster cover. In this manner an impression is left on the surface of the lath which serves as a quick guide to the lather in removing a piece of the lath to provide an opening for the box. More often than not the opening cut in the lath does not entirely clear the edges of the plaster cover, so that when the lath is finally nailed into position part of the force of the hammer blows are transmitted to the plaster cover and thence to the outlet box. Thus, in the usual lathing operation, there is at least one occasion and possibly two when direct hammer blows are available to drive the mounted box inwardly of the wall. In point of fact it has been found that the above practices result in driving the box inwardly of the wall to such a degree that they will no longer be correctly positioned relative to the finished plastered surface.

After lathing, the plastering operation is completed. It will be readily appreciated by those who understand present day plastering practice and the speed with which it is accomplished, that the open end of the recessed box 2,808,172 Patented Oct. 1, 1957 becomes partially filled with plaster and the edges of the plaster cover are overlapped with plaster which covers the lugs and the tapped holes which serve as mounting means for the subsequently installed switch. In some cases Where the box was deeply recessed in the wall, the entire box has been covered by plaster. It should be noted that this filling of the box with plaster and the covering of the lugs also frequently occurs in present practice even though the box is correctly positioned on the wall due to the speed and consequent carelessness with which the plaster is applied.

Considering the above set out practices, the difficulties relative to the subsequent wiring operation are thought to be obvious, but will nevertheless be briefly described.

The most important element from a cost standpoint is that the average electricians wage represents six cents per minute to the contractor and therefore to the home purchaser. With the outlet boxes filled or entirely hidden with plaster, the electrician must waste valuable time digging plaster before he is able to complete the job of pulling the wires and mounting the switches. Additionally, when the box is unreasonably recessed in the wall, the switch cannot be readily mounted in the correct position relative to the finished plaster surface. If the switch is mounted directly on the box the toggle thereof is too far recessed to be conveniently accessible to the user when the cover plate, which abuts the surface of the plaster, is installed. If an effort is made to mount the switch correctly, the electrician will be required to use screws longer than those normally associated with the switch in order to reach the recessed mounting holes. Furthermore, the box may be angled in any direction from the vertical plane of the wall due to the above set out practices, which renders proper switch mounting even more difi'icult. Obviously, valuable time is lost making these and other adjustments. I

Accordingly, it is a primary object of the invention to provide a novel outlet box arrangement designed to accommodate current lathing practice and to avoid the difliculties stemming therefrom relative to the plastering operation.

It is a specific object of the invention to provide an electrical outlet 'box arrangement meeting all code requirements and having means thereon to prevent the edges and open end thereof from becoming covered with plaster.

It is an additional specific object of the invention. to provide an arrangement as above described with extensible, fixable elements which will accommodate switch installation in the correct position relative to the finished plaster surface regardless of the relative position of the outlet box. I

It is another specific object of the invention with a novel plaster cover arrangement which may be conveniently associated with the outlet box.

It is a further specific object of the invention to provide a unique box arrangement as above described wherein upstanding lugs are arranged to prevent plaster from being swept into the box.

It is still another specific object of the invention to provide a unique box arrangement as above described wherein themeans thereon to accomplish the desired objects are so arranged as to avoid the possibility of wire insulation rupture or fraying during the final wiring operation whereby the possibility of short circuit is greatly reduced.

These and other objects of the invention will become apparent in the course of the following description and from an examination of the attached drawings, wherein: Figure 1 is a perspective view of the novel arrangement, Figure 2 is a fragmentary sectional view taken along line 22 of Figure 1,

- Figure 3 is a fragmentary sectional view taken along line 3-3 of Figure 2, and

element us edfin the invention.

In thepreferred embodiment of theinvention trated in the drawings, a standard outlet box commonly known as a 1900 box is indicated generally at 2.. "It will be noted that the box is. of rectangular form and hasone end thereof open, the closed sides of the box being provided with a plurality of circular knockouts 6 which accommodate installation of conduit as is well understood by those skilled'in the art Additionally, the box is provided with lugs 4, said lugs being bent into a plane defined by the edges of the open end'of the box'and provided with tapped holes (not shown) which receive screws 9 which 'in'turn are received in the apertures 10 of a'-plast'er cover 12, whereby the cover is securelymounted to the box 2.

The plastercover 12 comprises a substantially planer base plate14, said plate, 14 having the mentioned apertures ltl formed therein. Preferably centrally of the plate 14 a hole 16 is provided, said hole offering access to the inside of the box 2. hole 16 is illustrated in the preferred embodiment to be of rectangular form but this is by way of illustration only audit will be understood that any geometric form may reasonably fall within the purview of the invention. The cover12 is also provided with an upstanding ledge 18, said ledge being preferably disposed around the perimeter of the hole 16.

It should be noted that conventional plaster covers are provided with an upstanding ledge. However, as noted above, this ledge is covered in the plastering operation and the plaster deposited in the box. To avoid this I have provided a plurality of upstanding plaster guard lugs on the outer edge of the ledge 18. Thus in the plastering operation the plasterers trowel will strike the guard lugs preventing the depositing of plaster in the box. Additionally, these guard lugs act as knife edges to mark the rock lath when the lather strikes it thus preventing the full force of the blowfrom being transmitted to the box and aiding in the prevention of box recessing. Additionally, extensible elements 32 may bepositi'oned in the receiving slots, as hereinafter described, to serve as additional plaster guard lugs. After the plastering operation the elements 32 may be re positioned to serve their original intended function.

It should be noted that the mounting lugs 24 are attached to the edge of the ledge 18 and are disposed inwardly to fall substantially in the plane defined by the upper edge of the ledge 18. The lugs 24 present tapped holes 26, said holes serving as securing means for the subsequently mounted switch (not shown). The guard lugs 20 are preferably scored atthe base thereof, as at 27, in alignment with the edge of the ledge 18, whereby the guard lugs may be grasped with pliers and easily broken from the ledge should they interfere with switch installation after the plastering is completed.

Directing attention to Figures 1' and 3 it will be seen that the lugs 24 have a horizontal slot 28 formed therein adjacent the area of connection to the ledge 18. As is best shown in Figures 2 and 3, the plate 14 also comprises a plurality of spaced segments 30 which extend into the hole 16 and have the ends thereof bent outwardly, as at 33, toward the edge of the ledge 18. The two central segments 30 are separated and have apertures formed in their bases so that when viewed together (Figure 2) they form a T-slot 31, the upper or horizontal segment of the1 T-slot being aligned with the slot 28 formed' in the adjacent'mounting lug 24 (Figure 3). Slots 31a separate the outer segments 30 from the center segments 30, said slots 31a being designed to accommodate the insertion of abending tool such as a screw driver for the purpose hereinafter explained.

It should also be noted that anaddition'al reason'for Figure 4 is a perspective view of the novel extensible asiillus- It will be noted that the bending the segments 33 outwardly is to present smooth rounded edges adjacent the hole 16, thereby avoiding the possibility of cutting the wire insulation when the wire is subsequently pulled through the box and attached conduit.

Directing attention to Figure 4 it will be seen that the extensible element 32 comprises a base portion 34 having an end or mounting portion 36 angularly related thereto. The end portion has a drilled and tapped hole 38 formed therein whereby it may serve as a switch mounting as hereinafter described. The base portion 34 presents apiurality of transverse score marks 40 whereby said base portion may be grasped with pliers and broken off. to any desired length and thus avoid interference between the element and any wires in the box 2.

When it has been found that the box is too far recessed into the wall to accommodate convenient switch installation the base portion 34 of the elements 32 may be positioned in the upper and lower pairs of

slots

28 and 31. The depth of this positioning may be regulated by the electrician so that the end portion 36 is correctly located relative to the finished plaster surface to properly accommodate switch mounting. When the elements are properly located, the electrician merely inserts his screwdriver in theslots 31a and, by twisting the screwdriver, bends the central segments 30 toward each other whereby the element is wedged or locked between the upper edges of the T-slot 31 and the inner periphery of the ledge 18. Thus a 'new or auxiliary switch mounting means is afforded correctly located relative to the finished plaster surface. It should also be noted that the arrangement readily accommodates further adjustment, if necessary. That is, a screwdriver may be inserted in the central slot 31 and twisted urging the central segments 30 to disengage the element 32, whereby the element may be repositioned and again locked in the above described.

manner. p

t It will also be understood that the element receiving slots 28 and 3]. may be made somewhat larger than the width of the element 32, whereby the element may be limitedly pivotal about a vertical axis as is shown in phantom in the upper portion of Figure 1 (see pivoted element 3122, 22). Additionally, it will be readily apparent that the extended element may be bent vertically to any desired position. These features make possible easy switch installation even though the box is angled from the vertical plane of the wall about a vertical axis. If, on the other hand, the box is angled from the vertical planeof the wall about a horizontal axis, merely varying the length of the elements 32 and bending same if necessary, will provide easy switch installation. It will also be readily appreciated that virtually any odd angling of the box fromthe vertical plane of the wall can be accommodated by combining the utility of the above mentioned features and easy switchiinstallation will result.

From the foregoing it will be understood that I have provided a new and novel electrical outlet box arrangement which reduces installation time and resulting costs, solves the heretofore mentioned difiiculties and problems of theart, and answers nee'ds long felt in the art.

It will .alsobe understood that the above described preferred embodiment is by way of illustration and not limitation and. that many and varied modifications of the hereindiscl-osed invention may be made without departing from the spirit of the invention or the scope of the appended claims.

' Whatis claimed is:

1. In an arrangement of the type described, a box, a cover securable thereto, an aperture in the cover affording access to the'box, a ledge extending outwardly from the cover and approximately surrounding the aperture, mounting lugs attached to the ledge having threaded holes therein' whereby a switch may be mounted in the box, extensible elements, said elements having auxiliary mount: ing lugsthe'reon, slots in said first-mentioned mounting lugs, openings in said cover aligned with said first-mentioned slots, said extensible elements being receivable in said slots and openings, and bendable means on the cover engageable with said elements to fixedly lock said elements in selectable positions relative to said cover.

2. An arrangement according to claim 1, wherein said openings and slots are somewhat larger than the elements received therein.

3. An arrangement according to claim 1, wherein said last mentioned means comprises segments on the cover defining the openings aligned with said slots, said segments being bendable to engage said elements and wedge the elements against the ledge.

4. In an electrical outlet box arrangement for mounting in association with a wall to-be plastered to a determined depth, a box, a cover fixedly positioned relative to the box, an opening in the cover aifording access to the box, a plaster guard ledge extending outwardly from the cover and surrounding the opening, a plurality of plaster guard lugs extending from the outward edge of the ledge whereby the combined depth of said ledge and lugs is greater than said determined depth, mounting lugs hav ing threaded holes therein whereby a unit may be mounted in the box adjacent the opening, extensible elements associated with the cover having auxiliary mounting lugs thereon with threaded holes therein, and means to fixedly secure the elements to the cover in any of plurality of selectible positions comprising slots in the first mentioned mounting lugs, segments on the cover adjacent the edge of said opening and defining other slots aligned with the first mentioned slots, said slots receiving said elements,

and means on the cover engageable with the elements to fixedly secure the elements relative to the cover.

5. An electrical outlet box arrangement according to claim 4, wherein said last mentioned means comprises bendable portions on the segments operative to engage the elements and wedge same against the ledge.

6. An electrical outlet box arrangement according to claim 5, and including abutment means adjacent said bendable portions and defining therewith apertures to conveniently receive a bending tool.

7. In an arrangement of the type described, a box, a cover securable to the box, an opening in the cover affording access to the box, mounting lugs on opposite sides of the opening and having slots defined therein, bendable segments in spaced relation to the mounting lugs and defining other slots in determined alignment to the first-mentioned slots, abutments in spaced relation to the segments and defining therewith apertures arranged to conveniently receive a bending tool therebetween, said segments being bendable to engage and wedge said elements in a deter mined relation to the cover.

References Cited in the file of this patent UNITED STATES PATENTS Seist May 2, 1950