Shaft Wall Cavity Extension

This invention relates to hollow or cavity shaft walls constructed of metal studs and gypsum boards, and more particularly to increasing the cavity depth at utility boxes, particularly in horizontal stud walls.

Hollow, gypsum board walls surrounding elevator shafts have heretofore been constructed generally with vertical studs, typically as shown in Pearson, et al. U.S. Pat. No. 4,364,212. Suppliers of the metal I-stud for the Pearson, et al. wall found it necessary to provide I-studs of varying flange-to-flange dimensions, larger studs being essential when walls were to be taller than about ten feet.

The smallest and most common I-stud was 21/2 inches, flange-to-flange, whereby the depth of utility boxes used therewith could be no greater than 21/2 inches. If deeper boxes were ever needed, a larger stud would be used for that particular wall, normally the corridor-side wall.

A new and improved wall has been developed wherein horizontal studs are employed, one big advantage being that the horizontal studs can be 21/2 inches, flange-to-flange, regardless of the height of the wall. Accordingly, only 21/2 inch studs are manufactured for these walls. As a result, larger studs are not available for those occasions when a utility box deeper than 21/2 inches is needed.

A hollow, gypsum board wall is provided by the present invention which includes limited sections of increased depth of the wall cavity, the limited sections being only where it is desired to place a utility box, such as for elevator call buttons, elevator floor indicating lights, fireman switches, etc.

This additional depth is provided by omitting a short, full-width section of 1-inch-thick shaftliner or core board and installing preferably two layers of shaftliner or core board on the shaft side, overlapping this open area, creating 1-inch additional wall cavity.

It is an object of the present invention to provide a hollow wall structure wherein relatively deeper utility boxes can be installed.

It is a further object of the invention to provide a horizontal stud wall system wherein only one minimum size stud can be employed while still permitting modification of limited sections to permit installation of relatively deeper utility boxes.

These and other objects and advantages will be clearly understood in considering the preferred embodiments as set forth in the specification and shown in the drawings in which:

FIG. 1 is a vertical sectional end view of a hollow, horizontal stud shaft wall, having an expanded depth section with a 31/4-inch-deep utility box installed onto the corridor side of the wall.

FIG. 2 is a vertical sectional face view of the wall of FIG. 1, taken along line 2--2.

FIG. 3 is a horizontal sectional top view of the wall of FIG. 1, taken along line 3--3.

FIG. 4 is a horizontal sectional top view of a modified form of expanded depth section of a hollow, horizontal stud shaft wall.

FIG. 5 is a vertical sectional face view of the wall of FIG. 4, taken on line 5--5.

Referring to FIGS. 1-3, there is shown a small section of a hollow wall 10 whereat a relatively deep utility box 12 is installed in the wall 10. The wall 10, other than at this limited section, is constructed in accordance with the description set forth in copending application Ser. No. 07/858,797, filed Mar. 27, 1992, which application is incorporated herein by reference.

Wall 10 is basically constructed of alternating horizontal studs 14 and horizontally extending, 1-inch-thick, 2-foot-wide, gypsum primary core boards 16. As seen in FIGS. 2 and 3, a short, full-width section of core board 16 is omitted in a limited section 18 of wall 10.

Two layers of 1/2-inch-thick, 4-foot-wide wallboard 20 is screw attached to the outer flanges 22 of horizontal studs 14. The web 24 of each stud 14 is supported on a core board 16 disposed immediately therebelow, and another core board 16, disposed immediately thereabove, is supported on the web 24. The core boards 16 are disposed against the inner flanges 26 of the studs 14, and are thus spaced inwardly from the outer flanges 22 and the wallboards 20, forming the hollow, or the cavity 28 of wall 10.

In accordance with the invention, a pair of short, elongate clips 30 is affixed to the inner flanges 26 of the two studs 14 which form the top and the bottom of the limited section 18. Clips 30 hold, respectively, the top edge 32 and the bottom edge 34 of a pair of core board short sections 36 which overlap the open limited section 18, forming a hollow cavity 38, at the limited section 18, which is 1-inch wider than the cavity 28 in the other areas of wall 10.

The short, elongate clips 30 each include a narrow outer wall 40 connected by a reverse bend 42 to a somewhat wider middle wall 44, which form a channel 46 which is affixed over an inner flange 26 of a stud 14. Extending inwardly from the middle wall 44 is a horizontal wall 48, and then extending perpendicularly to horizontal wall 48, is an innermost, wide wall 50, forming a channel 52 which holds a top edge 32 or a bottom edge 34 of the pair of core board sections 36. Horizontal wall 48 and wide wall 50 can be made as long as the core board sections 36 held therein. Clips 30 may also include a narrow leg 54 extending outwardly from outer wall 40, for screw attachment of clip 30 to stud web 24, by screws 56. The core board sections 36 are preferably screw attached to innermost walls 50 by screws 58.

Utility box 12 includes a face plate 60 which is affixed against the outer face 61 of wallboards 20. Utility box 12 may contain any device, such as elevator call buttons, elevator floor indicating lights, fireman switches, etc.

Referring to FIGS. 4 and 5, another embodiment of the invention is shown, wherein similar elements are identified by numerals similar to those used in FIGS. 1-3. In this embodiment, the pair of core board sections 36 are held in an overlapping relation over the open limited section 18 by short, elongate clips 62, which are affixed to the ends 64 of the primary core boards 16 which form the sides of the limited section 18. Clips 62 hold the side edges 66 of the pair of core board sections 36 which overlap the open limited section 18, forming a hollow cavity 38, at the limited section 18, which is 1-inch wider than the cavity 28 in the other areas of wall 10.

The short, elongate clips 62 each include a narrow outer wall 68 connected by a narrow base wall 70 to a somewhat wider middle wall 72 which form a channel 74 which is affixed over an end 64 of a primary core board 16. Extending inwardly from the middle wall 72 is a wide base wall 76 and then extending perpendicularly from wide base wall 76 is an innermost wide wall 78 forming a channel 80 which holds a side edge 66 of the pair of core board sections 36. Base wall 76 and wide wall 78 can be as long as the core board sections 36 held therein.

The clips 62 are preferably screw attached to core board ends 64 by screws 82 which are each screwed through an outer wall 68, a core board end 64 and a middle wall 72. The pair of core board sections 36 are screw attached to clips 62 by screws 84 which are each screwed through a side edge 66 and an innermost wide wall 78.

Having completed a detailed disclosure of the preferred embodiments of my invention, so that others may practice the same, I contemplate that variations may be made without departing from the essence of the invention.