CA2069559C

CA2069559C - Shaft wall and horizontal metal stud therefor

Info

Publication number: CA2069559C
Application number: CA002069559A
Authority: CA
Inventors: Robert J. Menchetti
Original assignee: National Gypsum Co
Current assignee: National Gypsum Co
Priority date: 1992-03-27
Filing date: 1992-05-26
Publication date: 1998-04-28
Anticipated expiration: 2012-05-26
Also published as: IL103715A0; KR0151171B1; MX9205220A; KR930019953A; JP2711350B2; SG43790A1; EP0562779A1; TW278108B; NO930908D0; IL103715A; NO303026B1; CA2069559A1; AU663902B2; MY109407A; BR9301312A; JPH06341180A; AU2995792A; NO930908L

Abstract

A hollow shaft wall with horizontal studs held between vertical corner posts, with acutely angled webs forming a channel with the stud inner flanges, and bevelled edge core boards held by one edge in the angled channel and the other edge held by suitable means on an adjacent horizontal stud.

Description

SHAFT WALL AND HORIZONTAL METAL ~TU~ THEREFOR

This invention relates to sheet metal studs for supporting gypsum wallboard and to improved fire-resis-tant hollow shaft walls.

BACKGROUND OF THE INVENTION
Several patents have disclosed hollow shaft walls employing metal studs and gypsum wallboards; for example, U.~. Patent Nos. 3,740,912 and 4,353,192. These prior patents all employ metal studs between adjacent gypsum core boards, which metal studs are vertical studs.
These prior patents also have one-inch-thick core boards which have square edges abutting the webs of the vertical studs. The core boards commonly employed in these syste~s sometimes include slightly bevelled edges, strictly for ease of insertion into the channels formed between ~langes and tabs.
These prior structures have enjoyed consider-able commercial success; however, a shaft wall which can be more easily installed at lower cost and have improved performance is clearly desirable. These prior structures also required the studs to have greater flange-to-flange dimensions as walls were made progressively higher, resulting in increased steel usage and an increase in cost and labor.

SUMMARY OF THE INVENTION
In the present invention~ novel sheet metal studs are placed horizontally between adjacent, horizon-tally extending gypsum core boards~ typically in the four walls surrounding an elevator shaft and stairwells, and .

in area separation walls and the like. The metal studs include, essentially, an inner flange, an outer flange and an adjoining web with a core board abutting each side of the web. At least a narrow portion of the web which is closely adjacent the inner flange is in a plane which forms an acute angle with the inner flanqe creating a channel-like means for holding an edge of one of the two core boards against the inner ~lange. The web also includes means for holding an edge of the second core board aqainst the inner flange, on the opposite side of the web.
Two-foot wide and up to ten-foot long, one-inch-thick gypsum core boards are disposed, with their widths extending vertically and their lengths extending horizontally, between the horizontally extend-ing studs, said boards having bevelled lateral edges which abut the acutely angled webs of the studs.
The typical long side of a shaft enclosure is ten-feet long and consists essentially of alternating ten-foot long, horizontally extending core boards and ten-foot long, hori~ontally extending metal studs. The ends of the metal studs and the core boards are disposed within a channel in a suitable vertically extending corner stud or the like. Two layers of standard or special fire-retardant~ typically 4-foot wide gypsum wallboard (referred to herein as wide wallboard) are screw attached to the outer f langes of the metal studs.
The corner stud has two outwardly opening channels directed at right angles, and the core boards ~0 ~&~>~s~

and horizontal studs of two perpendicular walls ext~nd into the two respective channels.
It is an object of the present invention to provide a novel hori~ontal stud and a novel and improved wall construction utilizing such horizontal studs.
It is a further object of the invention to provide an improved, more economical shaft wall, suitable for erection from one side.
It is a still further object of the invention to provide a method of erecting walls which result in improved walls at a reduced cost.
It is a still further object of the invention to provide a method of erecting shaft walls which inherently includes the initial construction of a rela-tively low safety wall around the shaft opening that also provides ready access to the shaft for the installation o~ cants and the like.
It is a still ~urther object of the invention to provide a sha~t wall which is not substantially weakened by omission or removal of a narrow top portion for the installation of elevator rail supports/brackets.
It is still a further object of the invention to provide a shaft wall system that requires th~ stocking of fewer components for typical shaft wall installations.

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BRIEF DESCRIPTION OF THE DRAWINGS
These and other objects and advantages oE the invention will be more readi'ly apparent when considered in relation to the preferre,d embodiments as set forth in the specification and shown in the drawings in which:

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Fig. 1 is a perspective view o~ a portion of two perpendicular walls of an elevator shaft enclosure, constructed in accordance with the inventîon.
~ Fig. 2 is a cross-sectional plan view of the wall corner, taken on line 2-2 o~ Fig. 1.
Fig. 3 is a cross-sectional end view of the left wall of Fig. 1.
Fig. 4 is an isometric view of a horizontal stud of the walls of Fig. 1.
Fig. 5 is a cross-sectional end view of a modified wall embodying the invention.
Fig. 6 is an isometric view of an extra-long wall embodying the invention. ' Fig. 7 is an end view of a double-width board for forming two core boards.
Fig. 8 is an end view of a double-width board for forming two modified core boards.
Figs. 9-12 are isometric views of four modified horizontal studs wlth core boards in place, all in 2n accordance with the invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS
Re~erring to Fig. 1, there is shown part of a side wall 10 and part of a front wall 12 o~ a hollow shaft wall structure 14 surrounding an elevator shaft 16.
Elevator shaft 16 extends verticallv through a plurality of floor-ceillng platforms~ including the lower platform 18 and the upper plat~orm 20 of Fig. 1. The shaft wall structure 14 extends vertically from the lower platform 18 to the upper platform 20 along the edges 22 of these ~ J~

floor-ceiling platforms which surround and form the elevator shaft 16.
Side wall 10 consists of standard upwardly opening, channel-shaped floor track 24 (Fig. 3), having a horizontal we~ 26 and two vertical flanges 28, 30, a downwa~dly opening, channel shaped, ceilin~ track 32, having a horizontal web 34 and two vertical flanges 36, 38. Floor track 24 is mechanically a~fixed to t.he top of lower platform 18 and ceilinq track 32 is mechanically affixed to the bottom of upper platfGrm 20~ each adiacent the edges 22 of these floor-ceiling plat~orms. Ceiling track 32 preferably has a pluralit~ of spaced-apart vent openinqs 39 alony the top edge of flange 38, to improve the wall fire-resistance. Ceiling track 32 can also be used as a floor track.
At the corner of side wall 10 and front wall 12, as seen in Figs. l and 2, a vertical corner post ~0 is mounted with a bottom end ~2 disposed in a floor track 24 and a top end 44 disposed in a ceiling track 32, where the two floor tracks 24 and the two ceiling tracks 32 meet to form a 90~ corner 46 between side wall 10 and fxont wall 12. The corner post 40, which could be made by affixing two channels together back-to-side, is preferably a sin~le, elongate~ roll-formed sheet of metal having two outwardly opening channels 48, 50 fo~med of a single piece of 0.020-inch-thick steel, with the two channels 48 and 50 opening outwardly in directions at a 90~ angle ta one another and being directed toward, respectively, the side wall 10 and the front wall l?.

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Considering the side wall 10, Fig. 3 shows the arrangement of core boards 52, horizontal studs 54, and outwardly disposed gypsum wide wallboards 56, 58, which combin~e to form the side wall 10.
Typically the core boards 52 are paper-covered gypsum boards which are, in cross section, 2 feet by l inch, and will normally have a length equal to the extent of the wall 10. Of particular importance are the bevelled edges 60, 62 along the two long edges of each core board 52. Alternatively, non-bevelled board can be used. Preferably, the bevelled edges 60, 62 on each core board 52 have a bevel 64, 66 which is in a plane forming an angle of 12Q~ with one of the core board faces and 60~
with the opposite core board face, and preferably, when installed as shown in Fig. 3, the bevelled edges 60, 62 are parallel, one with the other, whereby the bevel 64 on edge 60 is at an angle of 120~ with core board face 68 and an angle of 60~ with core board face 70, whereas bevel 66 on edge 62 is at an angle of 120~ with core board face 70 and an angle of 60~ with core board face 68.
Preferably, the bevelled edges 60, 62 have a ~1at portion 72, of a width of about 3~8 inch, however, this could be varied considerably.
The first core board 52 to be installed in constructing wall 10 has a flat portion 72 resting on web 26 of floor track 24 and face 70 is held against flange 30 by a plurality of screws 74. The two ends 76 (one shown in Fig. 1) of core board 52 extend into corner posts 40 (one shown) but are not affixed thereto. On top .
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of the first core board 52 to be installed is the first horizontal stud 54 to be installed, and progressively, in constructing wall lO, additional core boards 52 and horizo~tal studs 54 alternately are put into place, each extending at each end thereof into the channel g8 of corner posts 90 (one shown~ but, preferably, neither core boards 52 nor studs 54 are affixed thereto.
The horizontal studs 54, shown in Figs. 3 and 4, are each a single, elongate, roll-formed sheet of metal, preferably 0.020-inch-thick steel, and include, essentially a Z-shaped cross section which includes an inner flange 78, a web 80 extending outwardly from inner flange 78 with an inwardly facing surface 84 which forms an angle of 60~ with inner flange 78, an outer flange 82 which is parallel to and preferably about 2-1/2 inches from inner flange 78 and a means 86 for holding a core board edge 62 against outwardly facing surface 88 of web 80. The stud 54 will be seen to form two opposed pockets for receiving the edges of two adjacent core boards 52.
In the form as shown in Fig. 4, the means 86, for holding core board edge 62 against the outwardly facing surface 88 of web 80, is a plurality of tabs 86 formed o~ ahout l-inch by about 3-inch sections o~ metal cut and bent out of web ao, located about every 12 inches. The inner flange 78 has a narrow, outwardly-turned hem 90. Inner flange 78 also has an outwardly depressed, elongate rib 92 with depth equal to the outward extent of hem 90. Rib 92 prevents twisting of the stud 54 when a builder rests a core board on the top of outer flange 82 during construction. Inner flange 78 ~3~

has a short, downwardly extending, elongate lip 94 formed by a reverse bend ~f the sheet metal and web 80 is adjoined to inner flange 78 at the top of lip 94. The inner flange 78 can be strengthened to some degree by forming the flange with the double thickness extending upwardly and the single thickness extending downwardly, with a hem at the bottom, as illustrated in Figs. 9-12.
An elongate, outermost portion 96 of web 80 i5 perpendicular to the outer flange 82, and outer ~1ange 82 has a narrow, inwardly turned hem 98.
In the embodiment shown in Fig. 3, all the horizontal studs 59 are disposed with the inner flange 78 extending primarily upwardly from web 80 and the outer flange 82 and tabs 86 extending downwardly from web 80.
It will be readily understood how gravity assists in the installation of the upper core board engaged in each stud 59. Two layers of gypsum wide wallboard 56, 58, prefera-bly 4-~oot wide and 1/2-inch or 5/8-inch thick, are screw attached to the outer flange 82 of each horizontal stud 2~ 54 and to corner posts 40.
In alternative embodiments, not shown, the horizontal studs 54 could be reversed with inner flanges 78 extending downwardly and the outer flanges 82 and tabs 86 extending upwardly, necessitating a reversal of the ~aces of the core boards 52. In this embodiment, tabs could interfere with the installation of the upper board, making construction a little more difficult. In a still further alternative embodiment, alternate horizontal studs 54 could be reversed, necessitating the use of core hoards with bevels on the s~me side on each core board ~ 3 ~ 2') and with core board faces alternating on adjacent core boards. This alternating embodiment will be clearly understood from the alternative embodiment of Fig. 5.
In Fig. 5, a different embodiment of the invention, employing modified horizontal studs 100, is shown, with the horizontal studs 100 arranged to show an alternating stud arrangement. The embodiment Gf Fig. 5 also has non-aligned core boards 102, which permit the inclusion oE vent holes 104 in the webs 106.
The elongate hori~ontal studs 100 have inner flanges 108 and outer flanges 110 which are parallel and extend in the same direction from the web 106. The web 106 includes three elongate elements, a diagonal section 112 extending outwardly at 60~ from one edge of inner flange 108, a mid-wall 11~ extending from the opposite edge of diagonal section 112 in the opposite direction as and parallel to the inner flange 108, and an outermost portion 116 which is perpendicular to the outer flange 110 and to mid-wall 114.
In order to improve the fire-resistant charac-ter of the wall 118, the mid-wall 114 is spaced outwardly of the lnner ~lange 108, a distance greater than the thickness of the core boards 102~ preferably a 1-1/4-inch spacing with l-inch-thick core board 102. Core board 102 having a flat portion 123 and a bevelled portion 12~, has edges 122, 122 with the bevel 124 o~ each edge adjacent the same face 126. The core boards 102 and the studs 100 are both erected in an alternatiny manner, with adiacent core boards 102 having faces 126 facing oppositely and adjacent horizontal studs having upper and lower sides g reversed. Consequently, every othe~ core board 102 is disposed outwardly l/9 inch, leaving an inner 1/4-inch strip 128 of web 106 exposed. A plurality of vent openings 104 are formed at spaced locations along this inner 1/4-inch strip 128. When a wall 118 is exposed to a fire, air is able to move through vent openings 104, cooling the wall 118.
Referring now to front wall 12 of Fig. 1, an elevator doorway 132 is shown, formed by two vertical roll-formed, sheet metal elongate door-frame posts 134 (one vertical post not shown), (similar door frame posts are shown in Fig. 6). As shown in a broken-away portion in Fig. 1, the door frame posts 134 include a web 136, two perpendicular flanges 138 and an inwardly protruding lip 140. A short section of re~ular formed sheet metal elongate channel 135 is affixed back-to-back with the portion of vertical door frame post 134 extending from the top of doorway 132 to the ceiling track 32, and anothsr section of channel 135 extends across the top of doorway 132.
Front wall 12 has short sections of core board 52 alternating with short sections of horizontal stud 54 along the side of doorway 132, with boards 52 and studs 54 extending into the channel 50 o~ corner post 40 and into the door frame post 134. Other short sections o~
horizontal studs 54 and core boards 52 extend horizon-tally over doorway 132 and into the short sections of channel 135. Two layers of gypsum wide wallboard 56, 58 are screw attached to the outer flanges of horizontal 30 studs 54 and to posts 40 and 139.

Referrin~ now to Fig. 6, an extra-lony wall 142 is shown, constructed in accordance with the invention.
The horizontal studs 54 preferably will not be more than 10-feet long for most elevator shaft walls, particularly with only 2-1/2-inch-wide studs. For walls having a length greater than 10 feet, an intermediate vertical post 144 is positioned at spacings o~ 10 feet or less. A
suitable intermediate vertical post 144 is shown formed o~ two door frame posts 134, back-to-back, preferably mechanically affixed together, however other configura-tions can also be used. Core boards 52 and hori~ontal studs 54 are shown extending from within corner posts 40 to within intermediate vertical post 144. Wide wall-boards 56, 58 are affixed to the outer flanges 82 of the horizontal studs 54.
Figs. 9 thru 12 show four additional modifica-tions of the invention.
Fig. 9 shows horizontal stud 170 with two core boards 172, in a manner similar to the structures of ~0 Figs. 1, 2 and 60 Horizontal studs 170 and core boards 172 are assembled into vertical corner posts 40, intermediate posts 149 and door frame posts 134 similar to core boards 102.
Horizontal stud 170 is an elongate, roll-formed sheet of metal with a cross section which includes an inner flange 174, a web 176 extending perpendicularly outwardly from the middle of inner flange 174 for about 9J16 inch to a 30~ upward bend 178, then extends upwardly and outwardly to a 30~ downward bend 180 and then extends outwardly to downwardly extending outer flanqe 18~.

'3 Bends 178 and 180 thus divide web 176 into an inner flat portion 184, a central diagonal portion 186 and an outer flat portion 188. In the several disclosed embodiments of this invention it is important that a portion of the web be at an acute angle to the inner flange at a portion which is spaced outwardly from the inner flange. This angled portion may extend inwardly and be ad~oined to the inner flange or the angled portion may be adioined to the inner ~lange by a narrow portion perpendicular to the inner flange.
Horizontal stud 170 also includes a plurality of downwardly extending tabs 190 formed of l-inch by ~-inch seGtions of metal cut and bent out of central diagonal portion 186. Tabs 190 are adjoined to central diagonal portion 186 adjacent to bend 178, and include a downwardly and outwardly extending angled portion 192 and a downwardly extending portion 194 terminating in a downwardly and outwardly angled lip 196 for ease of insertion of a core board 17~.
Inner ~lange 174 includes an upper double-thickness portion 198 and a lower single-thickness portion 200 which includes a lower hem 202 and a midway rib 204. Hem 202 and rib 204 both extend outwardly from the balance of lower port1on 200.
Horizontal stud 170 is mounted ~top an upper edge portion 206 of one of the two core boards 172 in Fig. 9, and a lower edge portion 207 of the other core board 172 is disposed atop stud 170.
The upper edge portion 206 of the one core 30 board 172 is held firmly between tabs 190 and the hem 202 .

and Lib ~04 of single-thickne~s portion 200 of inner flange 174. Upper edge portion 206 has a flat top portion 208 and a bevelled portion 210. Flat portion 208 abuts inner flat portion 184 of web 176 and bevelled portion 210 is parallel to and closely spaced from angled portion 192 of tab 190.
The lower edge portion 207 of the other core board 172 has a flat bottom portion 212, similar to flat top portion 208~ and a bevelled portion 214, similar to bevelled portion 210. Bevelled portion 214 rests on central diagonal portion 186 of web 176 and flat bottom portion ~12 is parallel to and closely spaced from inner flat portion 184 of web 176.
The very heavy, normally about ten-foot-long core boards 172 are relatively easily inserted onto each previously mounted horizontal stud 170 by merely sliding the bevelled portion 214 down the central diagonal portion 186 until the lower edge 207 abuts the double-thick portion 198 of inner flange 174. Lower edge 20 portion 207 is held firmly between inner flange 174 and diagonal portion 186 by the weight of the core board 172, plus the weight of all core boards 172 and horizontal studs 170 which are thereabove a part of the wall.
The horizontal studs 170 fit tightly onto the upper edge 206 of core boards 172~ but being much lighter and easier to manipulate than the core boards 172, very little problem is involved in this step. Gypsum wide wallboard (not shown) is screw attached against the outer surfaces 216 of the outer flanges 182 and to posts 40, 30 134 and 144.

Fig. lO shows horizontal stud 220 with two core boards 222, similar to core boards 52. Horizontal studs 220 and core boards 222 are assembled into vertical corner posts 40, intermediate posts 144 and door frame channels 134 in a manner similar to the structures of Figs. 1, 2 and 6.
Horizontal stud 220 is an elongate, roll-formed sheet of metal with a cross section which includes an inner flange 224, a web 226 extending outwardly and upwardly from the middle o~ inner ~lange 224 to a downward bend 22B and then extends outwardly to down-wardly extending outer flange 230. Bend 228 thus divides web 226 into an inner diagonal portion 232 and an outer flat portion 234.
Horizontal stud 220 also includes a plurality of downwardly extending tabs 236 formed of 1-inch by 3-inch sections of metal cut and bent out of inner diagonal portion 232~ Tabs 236 are adioined to the inner diagonal portion 232 of web 226 at about the middle of diagonal portion 232 and includes a downwardly and outwardly extending portion 238, a downwardly extending portion 240, and a downwardly and outwardly anqled lip 242 for ease of insertion of a core board 222.
Inner flange 224 includes an upper double-thickness portion 244 and a lower single-thickness portion 246 which includes a lower hem 248 and a midway rib 249, both extending outwardly.
Horizontal stud 220 is mounted atop an upper edge portion 250 of one of the two core boards 222 in Fig. lO, and a lower edge portion 252 of the other core board 222 is disposed atop stud 220.
The upper edge portion 250 of the one core board 222 is held firmly between tabs 236 and the hem 248 and rib 249 of single-thickness portion 246 of inner ~lange 224. Upper edge portion 250 has a flat top portion 254 and a bevelled portion 256 with an elongate corner 258 therebetween of about 150~.
The lower edge portion 252 of the other core board 222 has a flat bottom portion 260, similar to ~lat top portion 254 with the exception that it is on the opposite side of the core board 222, a bevelled portion 262, similar to bevelled portion 256 but also on the opposite side of core board 222, and an elongate corner 264 therebetween of about 150~.
The inner diagonal portion 232 of web 226 ~orms an angle 266 of 70~ with upper double-thickness portion 244 of inner flange 224. Since the corners 258 and 264 are both about 150~, the bevelled portions 256 and 262 extend at an angle 268 of about 60~ relative to the upper double-thickness portion 244. Conseguently, the upper edge portion 250 and the lower edge portion 252 of the core boards 222 both abut the web diagonal portion 232 at the corners 258 and 264.
The core boards 222 are easily lnserted onto each previously mounted horizontal stud 220, and the lower edge portion 252 is held ~irmly between înner flange 224 and web diagonal portion 232 by the ~eight o~
the core board 222, plu~ the weight oE all core boards 222 and horizontal studs 220 which are thereabove a part of the wall. Ho~izontal studs 220, being much lighter than the core boards 222, can be reasonably easily forced down onto the upper edge portions ~50 o~ the core boards 222. Gypsum wide wallboard (not shown) is screw attached against the outer surfaces 270 of the outer flanges 230 and to posts 40, 134 and 144.
Fig. 11 shows horizontal stud 272 with two core boards 274, similar to core boards 102. Horizontal studs 272 and core boards 274 are assembled into vertical corner posts 40, intermediate posts 144 and door fra~e channels 134 in a manner similar to the structures of Figs. 1, 2 and 6. Horizontal stud 272 is an elongate roll-formed sheet of metal with a cross section which includes an inner flange 276, a web 278 extending perpendicularly outwardly from the middle of inner flange 276 about 5/8 inch to 30~ downward bend 280, then extends downwardly and outwardly to an upwardly extending outer flange 282. Bend 280 thus divides web 278 into an inner flat portion 284~ and an outer diagonal portion 286.
Horizontal stud 272 also includes, at spaced apart locations along web 278, a plurality of upwardly extending tabs 288 and a plurality of downwardly extend-ing tabs 290, each forrned of, respectivel.y, l-inch by 3-inch sections and 1/2-inch by 3-inch sections o~ metal cut and bent out o~ outer diagonal portion 286. Tabs 288 are adjoined to outer diagonal portion 286 adjacent to bend 280~ and inc].ude an upwardly and outwardly extending angled portion 292 and an upwardly extending portion 294 terminating in an upwardly and outwardly angled lip 2967 30 for ease of insertion of a core board 274. Tabs 290 are adjoined to outer diagonal portion 286 about 1/2 inch outwardly ~rom bend 2~0, and include a downwardly extend-ing portion 298 and a downwardly and outwardly extending lip 300.
Inner flange 276 includes an upper double-thickness portion 302 and a lower single-thickness portion 304 which includes a lower hem 306 and a midway rib 308, both extending outwardly from the other parts of lower portion 304.
Hori~ontal stud 272 is mounted atop an upper edge portion 310 of one of the two core boards 274 in Fig. 11, and a lower edge portion 312 of the other core board 274 i5 disposed atop stud 272.
The upper edge portion 310 o~ the one core board 274 is held Eirmly between tabs 290 and the hem 306 and rib 308 of single-thickness portion 304 of inner flange 276. Upper edge portion 310 has a ~lat top portion 314 and a bevelled portion 316. Flat portion 319 abuts inner flat portion 284 of web 278 and bevelled portion 316 is parallel to and closely spaced from outer diagonal portion 286 o~ web 278.
The lower edge portion 312 of the other core board 274 has a ~lat bottom portion 318, similar to flat top portion 314, and a bevelled portion 320, similar to bevelled portion 316. Flat bottom portion 31B is parallel to and closel~ spaced from inner flat portion 284 of web 278 and bevelled portion 320 rests on a~gled por~ion 292 of tabs 288.
The core boards 274 are relatively easily inserted between the tabs 288 and 290 and the inner flange ~76 because of the bevelled portions 316 and 320, which engage and slide on the respective tab lips 296 and 300. Gypsum wide wallboard (not shown) is screw attached against the outer surface~ 322 of outer flanges 282 and to posts 40, 134 and 194.
In a preferred embodiment, Fi~ shows horizontal studs 324 with two core boards 326, similar to core boards 52. Horizontal studs 324 and core ~oards 326 are assembled into corner posts 40, intermediate posts 144 and door frame channels 134 in a manner similar to the structures of Figs. 1, 2 and 6. Horizontal stud 324 is an elongate roll-formed sheet of metal with a cross section which includes an inner flange 328; a web 330 extending perpendicularly outwardly from the middle of inner flange 328 about 5/8 inch, forming a flat portion 332, whereat a major portion 334 of web 330 extends upwardly and outwardly about 5/8 inch to bend 336 and thence downwardly and outward]y to an upwardly extending outer flange 338. A minor portion 340 of web 330, about a 3-inch length of each foot of web, extends down~ardly and outwardly about 5/8 inch to bend 342, thence down-wardly to bend 394 and thence outwardly to upwardly extending outer flange 338. Slits 34G were ~ut crosswise of web 330, during forming of horizontal stud 324, from the flat portion 332 to the outer flange 338. The slits 346 are preferably angled slightly to form minor portions 340 which have a shorter dimension along the outer flange bend 348 than along the bend 349, whereat the minor portion 340 is adjoined to the flat portion 332. By angling the slits 3469 heat trans~er through the stud, .

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from one Elange to the opposite flange is reduced, and, also, the studs are more easily stacked for warehousing and shipping.
The bend 336 divides the major portion 334 of web 330 into a ramp portion 350 and a connecting portion 352. The bends 342 and 344 divide the minor portion 340 into a bevel portion 354, a board holding portion 356 and a connecting portion 358.
Both ends of web maior portion 33~ and of web minor portion 340 are integrally connected to the stud;
they have no free or dangling ends. Thus, as shown in Fig. 12, web 330 has no tabs or any other part with a dangling or free end, all of which enhances the structural integrity of the web.
Inner flange 328 includes an upper double-thickness portion 360 and a lower single-thickness portion 362 which includes a lower hem 364 and a midway rib 366, both extending outwardly.
Horizontal stud 324 is mounted atop an upper 20 edge portion 368 of one of the two core boards 326 in Fig. 12, and a lower edge portion 370 of the other core board 326 is disposed atop stud 324.
The upper edge portion 363 of the one core board 326 is held firmly between board holding portion 356 o~ web minor portion 3~0 and the hem 36~ and rib 366 of single-thickness portion 362 of inner flange 328.
Upper edge portion 368 has a Elat top portion 372 and a bevelled portion 374 with an elongate corner therebetween of about 150~. Flat portion 372 abuts flat portion 332 2 ~

of web 330. Bevelled portion 374 is parallel to and closely spaced from minor portion, bevel portion 354.
The lower edge portion 370 of the other core board 326 has a flat bottom portion 376, similar to flat top portion 372, and a bevelled portion 378 similar to bevelled portion 374. Flat bottom portion 376 is parallel to and closely spaced Erom flat portion 332 of web 330, and the junction of flat bottom portion 376 and bevelled portion 378 rests on ramp portion 350.
The core boards 326 are inserted onto each previously mounted hori~ontal stud 324 by merely sliding the bevelled portion 378 of lower edge portion 370 down the ramp portion 350 of the web 330 until the lower edge portion 370 abuts the double-thick portion 360 of inner ~lange 328. The lower edge portion 370 is held between the ramp portion 350 and inner flange 328 by the weight o~ the core board 326, plus the weight of all core boards 326 and horizontal studs 324 which are thereabove a part of the wall.
The horizontal studs 324 are forced onto the upper edge 368 o~ each core board 326, with the core board bevelled portion 374 guiding the stud web minor portion 340 into the space between the inner ~lange 328 and the board holding portion 356.
Gypsum wide wallboard ~not shown) is screw attached against the outer surfaces 380 of the outer flanges 338 and to posts 40, 134 and 144.
In the preferred forms of the invention, narrow, elongate slots 382 are arranged at spaced locations along the webs 80, 106, 176, 226, 278 and 330, - 20 ~

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typically about 3 inches by l/2 inch, spaced an inch apart, for reducing the heat conductivity through a walI, in case of fire on one or the other sides o~ the wall.
Also, horizontal studs 54, 170, 220, 272 and 324 could have 3/16-inch by 2-1~4-inch vent holes 384 added, with 3/4-inch spacing, similar to the vent holes 109 in stud 100 .
With regard to the application of two layers of gypsum wide wallboard 56, 58, on any of the horizontal stud embodiments, these 1/2-inch or 5/8-inch wallboards may be screw applied with their long dimension horizontal or vertical or with one layex horizontal and one layer vertical. All-vertical application is normally pre-ferred, with joint locations staggered. With regard to the installation of all-horizontal studs 54, 170 and 220 in side wall 10 with tabs 86, 190 and 236 extending downward, although this is the pre~erred construction, the walls could be constructed with tabs 86, 190 and 236 extending upward; that is, by reversing the horizontal 20 studs 54, 170 and 220 and reversing the core boards 52 and 222.
Figs. 7 and 8 show how two 2-foot-wide core boards 52 and 222 or 102 can be manufactured as a substitute for the more common standard 2-foot-wide core board. In Fig. 7, a 4-fGot wide~ l-inch~thick, paper-covered gypsum board 146 is shown with a jagged break line 148 in the center of board 146. By forming board 146 with two bevelled edges 150 adjacent the top face 152 and a V-groove 154 in the center o~ the back face 155, the wide board 146 can be broken in half to form two core boards 52 or 222.
In Fi~. 8, a 4-fnot-wide, 1-inch-thick, payer-covered gypsum board 158 is shown with a jagged break line 160 in the center of board 158. By ~orming board 158 with two bevelled edges 162 adiacent the top face 164 and V-groove 166 in the center of the top face 164, the wide core board 158 can be broken in half to for~ two core boards 102. The present invention has an added advantage in that the rough, jagged edges formed by breaking wide gypsum boards 146, 158, extend into a 60~
channel in either of the horizontal studs 5, lO0 or 220 where the jagged edges present no problem.
Another very lmportant advantage of the present invention is in the fact that the construction of a wall in accordance with the invention, such as side wall 10, involves constructing, essentially, a two-foot wall with the lowest core board 52, then a four-foot wall with the second lowest core board 52~ etc. Construction of these walls can be stopped at any two-foot multiple height.
Accordingly, a desired four-foot wall can be erected with no extra trouble for use as a temporary safety wall around an elevator shaft prior to the time when a com-plete elevator shaft wall is desired, leaving access to the shaft, over the four-foot wall, during early phases of construction, ~or easy installation of cants or the like. Also, accordingly, core boards can be omitted or removed from ~etween the top horizontal stud and the ceiling track without weakening substantially the resul-tant wall, as occurs in prior vertical stud structures, ~ 3 wherein portions of vertical studs must be cut away.
This omission is sometimes necessary to install elevator rail supports~brackets.
Of greatest significance, is the fact that with horizontal studs carrying the weight of core boards, the horizontal studs are effectively rnade stronger propor-tional to the weight on them, which is not true of vertical studs, which o~viously do not carry the weight of core boards between them. With core board edges bevelled and horizontal stud webs or tabs at correspond-ing acute angles, a substantial increase in strength and stiffness is provided in the resultant wall. As a result, horizontal studs which are only about 2-1/2 inches, flange-to-flange, are adequate regardless of the height of the wall.
It should also be noted that the construction of walls in accordance with the invention is easier and faster than prior shaft walls, and is suitable for construction from one side, the side opposite the shaft.
Contributing most to the ease of erection is the use of the horizontal stud with a wide, angled-bottom channel into which the bottom edge of each core board is fed.
More particularly, the web of the stud includes structure for g~liding the bottom edge of the core board laterally toward the stud's inner flange, under the urging of gravity. For example, in the embodiment of Fig. 9, the guide structure comprises web diayonal portion 186; in Fig. 10, it comprises web diagonal portion 232; in Fig.
11, it comprises upwardly and outwardly extending lip 30 portion 296 and angled portion 292~ and in Fig. 12~ the ': ' ~ ~3 ~

guide structure comprises web ramp portion 350. This type of guide structure facilitates positio~ing of the core board at the desired location on the stud by an assembler whose vision of that location can be impeded by the core board during assembly. In all such embodiments the guiding function results from the presence of web structure which is engageable with the lower edge of the core board and which is inclined downwardly and inwardly toward the innex flange oE the stud which, in the pre-ferred embodiments, includes an upper portion having adouble thickness of sheet metal. That part of the core board adjacent its lower edge is positioned adjacent the double thickness of sheet metal on the inner flange, and that feature functions to retain the core board in place, during a fire, for a relatively long period of time compared to an inner flange having a single thickness of sheet metal at that ]ocation.
Although the invention has been described as a shaft wall for construction around elevator shafts, its advantages will be egually available when the wall is constructed anywhere else~ such as around stairwells or as area separation walls of the type commonly constructed between adjoining condominiums and townhouses. It is presently contemplated that the walls of the present invention can be successfully constructed with heights of up to about 36 feet, compared to about 12 feet for a similar sized vertical stud of prior shaft walls. If core boards can be made with greater resistance to crushing than presently normal, there would be no reason-able height limitation. Conversely, prior shaft walls - 2~ -. .

~3 ~ fi ~

required vertical studs with dimensions oE more than 2-1/2 inches Elange-to-flange when the wall exceeded the normal hei~hts. For example, 4-inch and 6-inch flange-to-flange vertical studs were required for constructions when heights increased above about 14 ~eet. The present invention provides a system wherein the 2-1/2-inch flange-to-flange dimension is adequate regardless of wall height. Still ~urther, the horizontal stud of the present invention requires the same or less metal than any prior shaft wall stud.
It will be appreciated that a solid wall configuration built in accordance with the present invention will also provide a number of benefits of the preferred embodiments of the invention.
Having completed a detailed description of the preferred embodiments of my invention so that those skilled in the art may practice the same, I contemplate that variations may be made without departing from the essence of the invention.

Claims

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. A hollow wall, extending vertically upwardly from a floor, readily assembleable from a first outer side and suitable for construction where the second inner side is relatively inaccessible, comprising:
a) a plurality of horizontally disposed, elongate, formed sheet metal studs, said studs being vertically spaced apart and each stud being formed from sheet metal and having an inner flange, a central web and an outer flange;
b) a plurality of core boards between said studs, each said board having an upper edge and a lower edge, said lower edge of at least one of said core boards being supported on a central web of said stud immediately therebelow and said upper edge of a second said core board being disposed against and supporting said central web of said stud immediately therea-bove, said boards being in contact with said studs throughout substantially the full length of each said stud, means on said stud holding said core board edges spaced inwardly from said outer flange of said stud and adjacent said inner flange;
c) attachment means at each end of said hollow wall for connecting ends of said studs and maintaining the positions of said studs and providing vertically aligned ends of said studs; and d) wallboard affixed to an outer face of said outer flange of said horizontal stud.

2. A hollow wall as defined in claim 1, wherein said horizontal stud web includes a portion closely adjacent said inner flange extending outwardly and upwardly at an acute angle to said inner flange, said lower edge of said one of said core boards is supported at least in part on said outwardly and upwardly angled portion of said web of said stud immediately therebelow and said upper edge of said second core board supports said web immediately thereabove.

3. A hollow wall as defined in claim 1 or 2, wherein said horizontal stud web includes a mid-wall portion parallel to said inner flange and said means on said stud holding such core boards spaced inwardly from said outer flanges comprises said acutely angled portion of said web as to one edge of one of said core boards and said mid-wall portion as to one edge of a second of said core boards.

4. A hollow wall as defined in claim 2, wherein said means on said stud for holding said core boards spaced inwardly from said outer flange comprises alternating portions of said web, said web having a plurality of spaced laterally extending slits separating said alternating portions, said alternating portions being upwardly bent web portions and downwardly bent portions, said outwardly and upwardly extending portion of said web being a part of said upwardly bent web portion, said downwardly bent portions including means for holding said core board upper edge spaced from said outer flange.

5. A hollow wall as defined in any preceding claim, further comprising an upwardly opening channel-like floor track affixed to a floor having a vertical inner flange and a vertical outer flange, a downwardly opening channel-like ceiling track affixed to a ceiling having a vertical inner flange and a vertical outer flange, and attachment means having bottom ends affixed within said floor track and top ends affixed within said ceiling track, a lowermost of said core boards having a lower side edge affixed to an inner side of said floor track inner vertical flange, an uppermost of said core boards having an upper side edge affixed to an inner side of said ceiling track inner vertical flange, and said wallboard having bottom and top edges affixed to an outer side of said floor and ceiling tracks' outer vertical flanges.

6. An enclosure formed by four hollow walls as defined in claim 5, said four walls being interconnected by said attachment means, each having a pair of perpendicularly directed, vertically extending channels, whereby each said channel functions as a fixed vertical post for each of two of said inner connected walls.

7. An enclosure as defined in claim 6, wherein said four walls are disposed adjacent a floor opening, and said horizontal stud inner flanges are disposed on a side of said walls which is adjacent said floor opening, for example, an elevator shaft wall enclosure with a door in one wall.

8. A formed elongate sheet metal stud suitable for horizontal application in a hollow wall comprising an elongate inner flange, an elongate outer flange, an elongate web joining said inner and outer flanges, and means for holding two boards against said inner flange spaced inwardly from said outer flange, said means for holding one of said boards against said inner flange comprising a channel formed by an acutely angled portion of said web and said inner flange, said acutely angled portion of said web extending outwardly from closely adjacent said inner flange forming an acute angle with said inner flange for guiding a core board toward said inner flange by gravity.

9. A formed elongate sheet metal stud as defined in claim 8, wherein said means for holding a second of said boards against said inner flange is a short mid-wall section of said web which is parallel to said inner and outer flanges.

10. A formed elongate sheet metal stud as defined in claim 8, wherein said web comprises alternating portions and a plurality of spaced laterally extending slits separat-ring said alternating portions, said alternating portions be-ring upwardly bent portions and downwardly bent portions, said means for holding said one of said boards being said upwardly bent web portions wherein said means for holding a second of said boards against said web is said downwardly bent web por-tions.

11. A stud as recited in claim 10, wherein said upwardly bent web portions each comprises:

a first portion extending laterally from said inner flange toward said outer flange;
a second portion extending upwardly from said first portion, away from said inner flange; and a third portion extending downwardly from said second portion towards said outer flange;
and wherein preferably said downwardly bent web portions each comprises:
a first portion on the downwardly bent web portion, extending laterally from said inner flange toward said outer flange;
a second portion on the downwardly bent web portions, extending downwardly from said first portion on the downwardly bent web portions, away from said inner flange; and a third portion on the downwardly bent web portions extending from said second portion of the downwardly bent web portions toward said outer flange.

12. The method of erecting a hollow wall on a floor, comprising the steps of alternately mounting core boards and horizontal metal studs progressively upwardly from said floor, said horizontal studs having elongate ver-tical inner flanges, elongate vertical outer flanges and webs interconnecting said inner and outer flanges, said core boards having bottom edges and top edges, mounting said horizontal studs with said webs supported on said core board top edges, and mounting said core boards with said bottom edges supported on said webs on an acutely angled portion, relative to said inner flange, with said core boards spaced inwardly from said outer flanges, securing ends of said studs to maintain the portions of said studs and provide vertically aligned ends of said studs, and affixing wallboard to outer surfaces of said outer flanges.

13. The method of claim 12, wherein said core boards are held inwardly spaced from said outer flanges by one board edge being placed in a channel formed by said acutely angled web portion and said inner flange and said second board edge being placed in a channel formed by said acutely angled web and a mid-wall section of said web which is parallel to said inner and outer flanges.

14. The method of claim 12, wherein said acutely angled web portion and said inner flange form an upwardly opening channel and said core board lower edge is inserted downwardly into said channel with said lower edge disposed against said acutely angled portion, whereby said bottom edge slides quickly down said acutely angled portion to a firm position against said inner flange.

15. The method of making an enclosure along an opening in a floor comprising the method steps of claim 12, and positioning the wall along an opening in the floor, and said horizontal studs are mounted with said inner flanges on the side of said wall adjacent said opening and wherein, if desired, a lower part of said wall is used as a temporary safety wall by halting temporarily the construction of said wall at a time when said core boards and said horizontal studs having been mounted up to a partial wall height suitable to function as a safety wall, proceeding with construction of other parts of a building containing said wall for a desired period of time, and subsequently resuming the construction of said wall until completed.

16. The method of claim 12, wherein said core board edges include a bevelled portion, further comprising the steps of forming said bevelled core board by breaking a relatively wide bevelled edge board in half along an elongate V-groove formed along the center of a face of said wide board, whereby a rough edge is formed in a non-bevelled portion of one edge of each board which fits into a channel formed by said acutely angled portion and said inner flange without any interference caused by said rough edge.

17. A wall corner structure for receiving two perpendicular hollow walls as defined in claim 1, comprising a vertical corner post affixed at a bottom end and at a top end, by suitable means, between a pair of adjacent floor-ceiling platforms, said corner post comprising a single, elongate formed metal element having a cross section comprising two channels opening outwardly in directions at a 90° angle to one another, said channels comprising a bottom wall and parallel, spaced, inner and outer side walls extending perpendicularly from said bottom wall, wherein said bottom wall of a first one of said channels is said inner side wall of a second of said channels and wherein said bottom wall of said second channel is coplanar with said outer side wall of said first of said channels, said channels having substantially equal width, and said channel widths being suitable for receiving and horizontally retaining the ends of a plurality of spaced parallel horizontal studs.

18. A wall corner structure as defined in claim 17, wherein said corner post is a roll-formed sheet metal element.

19. A wall corner structure as defined in claim 18, wherein a first plurality of spaced, parallel horizontal studs all have an end retained within said first of said channels and a second plurality of spaced, parallel horizontal studs all have an end retained within said second of said channels, said first plurality of studs all being within a first vertical plane perpendicular to a second vertical plane within which are all of said second plurality of studs.

20. A wall corner structure as defined in claim 19, wherein said horizontal studs in each respective plurality of studs are held in a spaced relation by paper-covered gypsum core boards disposed therebetween.

21. A hollow wall, extending vertically upwardly from a floor, readily assembleable from a first outer side and suitable for construction where the second inner side is relatively inaccessible, comprising:
(a) two fixed vertical posts each extending upwardly from said floor at each end of said hollow wall and each having a vertically extending channel with a channel opening directed toward the opposite of said vertical posts;
(b) at least one horizontally disposed, elongate, formed sheet metal stud, said stud being formed from a single sheet of sheet metal and having an inner flange, a central web and an outer flange;
(c) a plurality of core boards, each said board having an upper edge and a lower edge, each said board having a length substantially equal to the length of said horizontal stud, said lower edge of at least one of said core boards being supported on a central web of said stud immediately therebelow and said upper edge of a second said core board being disposed against and supporting said central web of said stud immediately thereabove, means on said stud holding said core board edges spaced inwardly from said outer flange of said stud, said horizontal stud and said core boards having opposed ends extending into said channels of said pair of vertical posts; and (d) wallboard affixed to an outer face of said outer flange of said horizontal stud.

22. A hollow wall as defined in claim 21, wherein said horizontal stud web includes a portion closely adjacent said inner flange extending outwardly and upwardly at an acute angle to said inner flange, said lower edge of said one of said core boards is supported at least in part on said outwardly and upwardly angled portion of said web of said stud immediately therebelow and said upper edge of said second core board supports said web immediately thereabove.

23. A hollow wall as defined in claim 22, wherein said horizontal stud has an upwardly opening channel formed by said acutely angled portion of said web and said inner flange whereby, during construction of said wall, said core board can be very easily and quickly placed on said acutely angled portion and slid down to a lowest possible position against said inner flange whereby it becomes quickly laterally affixed in a stable position.

24. A hollow wall as defined in claim 22, wherein said means on said stud holding said core boards spaced inwardly from said outer flanges comprises said acutely angled portion of said web as to said lower edge of said one of said core boards and a plurality of short tabs cut and bent downward out of said web as to said upper edge of said second of said core boards.

25. A hollow wall as defined in claim 22, wherein said horizontal stud web includes a mid-wall portion parallel to said inner flange and said means on said stud holding such core boards spaced inwardly from said outer flanges comprises said acutely angled portion of said web as to one edge of one of said core boards and said mid-wall portion as to one edge of a second of said core boards.

26. A hollow wall as defined in claim 22, wherein said means on said stud for holding said core boards spaced inwardly from said outer flange comprises a plurality of short tabs some of which said tabs are cut and bent downwardly out of said web and the others of said tabs are cut and bent upwardly out of said web.

27. A hollow wall as defined in claim 22, wherein said means on said stud for holding said core boards spaced inwardly from said outer flange comprises alternating portions of said web, said web having a plurality of spaced laterally extending slits separating said alternating portions, said alternating portions being upwardly bent web portions and downwardly bent portions, said outwardly and upwardly extending portion of said web being a part of said upwardly bent web portion, said downwardly bent portions including means for holding said core board upper edge spaced from said outer flange.

28. A hollow wall as defined in claim 21, further comprising an upwardly opening channel-like floor track affixed to a floor having a vertical inner flange and a vertical outer flange, a downwardly opening channel-like ceiling track affixed to a ceiling having a vertical inner flange and a vertical outer flange, said vertical posts having bottom ends affixed within said floor track and top ends affixed within said ceiling track, a lower most of said core boards having a lower side edge affixed to an inner side of said floor track inner vertical flange, an uppermost of said core boards having an upper side edge affixed to an inner side of said ceiling track inner vertical flange, and said side wall-board having bottom and top edges affixed to an outer side of said floor and ceiling tracks' outer vertical flanges.

29. A hollow wall as defined in claim 21, wherein said horizontal stud webs and said ceiling track have a plurality of vent holes, permitting increased air circulation during a fire and increasing the fire-resistance rating of said wall.

30. A hollow wall as defined in claim 21, wherein said wall is greater than 10 feet in length and said wall is divided into a plurality of sections, said sections being defined by an intermediate vertical post separating said sections, said intermediate vertical posts extending from said floor to said ceiling height and having a pair of oppositely directed, vertically extending channels, said intermediate vertical post being one of the pair of vertical posts for each of said sections.

31. An enclosure formed by four hollow walls as defined in claim 21, said four walls being interconnected by said fixed vertical posts, each having a pair of perpendicularly directed, vertically extending channels, whereby each said fixed vertical post functions as said fixed vertical post for each of two of said inner connected walls.

32. An enclosure as defined in claim 31, wherein said four walls are disposed adjacent a floor opening, and said horizontal stud inner flanges are disposed on a side of said walls which is adjacent said floor opening.

33. An enclosure as defined in claim 32, wherein said enclosure is an elevator shaft wall, said four walls enclose an elevator shaft and at least one of said walls has an elevator doorway therein, said elevator doorway having a pair of opposed vertical doorway channels on each side of said doorway extending from said floor to said ceiling height, said doorway channels having openings directed away from said doorway, said walls having said doorways having horizontal studs and core boards adjacent said doorway which extend into said doorway channels.

34. A formed elongate sheet metal stud suitable for horizontal application in a hollow wall consisting essentially of an elongate inner flange, an elongate outer flange, an elongate web joining said inner and outer flanges and means for holding two boards against said web and spaced inwardly from said outer flange, said means for holding one of said boards against said web comprising a channel formed by an acutely angled portion of said web and said inner flange, said acutely angled portion of said web extending outwardly from closely adjacent said inner flange forming an acute angle with said inner flange.

35. A formed elongate sheet metal stud as defined in claim 34, wherein said acutely angled portion of said web forms an angle with said inner flange of about 60°.

36. A formed elongate sheet metal stud as defined in claim 34, wherein said means for holding a second of said boards against said web is a short sheet metal tab cut and bent out of said web.

37. A formed elongate sheet metal stud as defined in claim 34, wherein said means for holding a second of said boards against said web is a short mid-wall section of said web which is parallel to said inner and outer flanges.

38. A formed elongate sheet metal stud as defined in claim 34, wherein said acutely angled portion of said web is a portion of an upwardly extending tab and said means for holding a second of said boards against said web and said inner flange is a short sheet metal tab cut and bent downwardly out of said web.

39. A formed elongate sheet metal stud as defined in claim 34, wherein a plurality of spaced-apart vent holes are in said web.

40. A formed elongate sheet metal stud as defined in claim 34, wherein said means for holding a second of said boards against said web is a short mid-wall section of said web which i parallel to said inner and outer flanges.

41. A formed elongate sheet metal stud as defined in claim 34, wherein said stud is formed of a sheet of steel of about 0.020-inch thickness and is about 2-1/2 inches from inner flange to outer flange.

42. The method of erecting a hollow wall comprising the steps of mounting a pair of fixed vertical posts, each being mounted on a floor and having a vertically extending channel extending upwardly from said floor, directing said channels of each said post toward said opposite post and alternately mounting core boards and horizontal metal studs progressively upwardly from said floor with ends of said boards and studs extending into said post channels, said horizontal studs having elongate vertical inner flanges, elongate vertical outer flanges and webs interconnecting said inner and outer flanges, said core boards having bottom edges and top edges, mounting said horizontal studs with said webs supported on said core board top edges, sand mounting said core boards with said bottom edges supported on said webs, with said core boards spaced inwardly from said outer flanges, and affixing wallboard to outer surfaces of said outer flanges.

43. The method of claim 42, wherein said webs include an acutely angled portion relative to and closely adjacent to said inner flange, wherein said board bottom edges are all mounted against said web acutely angled portions.

44. The method of claim 43, wherein said core boards are held inwardly spaced from said outer flanges by one board edge being placed in a channel formed by said acutely angled web portion and said inner flange and said second board edge being placed in a channel formed by said web and a plurality of short tabs cut and bent from said web.

45. The method of claim 43, wherein said core boards are held inwardly spaced from said outer flanges by one board edge being placed in a channel formed by said acutely angled web portion and said inner flange and said second board edge being placed in a channel formed by said acutely angled web and a mid-wall section of said web which is parallel to said inner and outer flanges.

46. The method of claim 43, wherein said acutely angled web portion and said inner flange form an upwardly opening channel and said core board lower edge is inserted downwardly into said channel with said lower edge disposed against said acutely angled portion, whereby said bottom edge slides quickly down said acutely angled portion to a firm position against said inner flange.

47. The method of claim 46, wherein said acutely angled web portion and a bevelled edge on said core board lower edge are both acutely angled at about 60°.

48. The method of making an enclosure along an opening in a floor comprising the method steps of claim 42, wherein said pair of fixed vertical posts is positioned such that the wall will be disposed along said floor opening, and said horizontal studs are mounted with said inner flanges on the side of said wall adjacent said opening.

49. The method of claim 48, wherein a lower part of said wall is used as a temporary safety wall by halting temporarily the construction of said wall at a time when said core boards and said horizontal studs have been mounted up to a partial wall height suitable to function as a safety wall, proceeding with construction of other parts of a building containing said wall for a desired period of time, and subsequently resuming the construction of said wall until completed.

50. The method of claim 43, wherein said core board edges include a bevelled portion, further comprising the steps of forming said bevelled core board by breaking a relatively wide bevelled edge board in half along an elongate V-groove formed along the center of a face of said wide board, whereby a rough edge is formed in a non-bevelled portion of one edge of each board which fits into a channel formed by said acutely angled portion and said inner flange without any interference caused by said rough edge.

51. A formed, elongate, sheet metal stud for horizontal application in a hollow wall including a plurality of core boards each having an upper edge and a lower edge, said stud comprising:

an elongate inner flange;
an elongate outer flange; and an elongate web extending laterally between and joining said inner and outer flanges;
said web comprising means, engageable with said lower edge of one core board, for guiding said core board laterally toward said inner flange under the urging of gravity.

52. A stud as recited in claim 51 and comprising:
means on said web, engageable with said core board, adjacent one of said core board edges, for holding said core board adjacent said inner flange and spaced from said outer flange.

53. A stud as recited in claim 52 and comprising:
means on said web, engageable with another core board, for holding said other core board adjacent said inner flange, spaced from said outer flange, and at a different elevation than said first-recited core board.

54. A stud as recited in claims 52 and 53, wherein said web is devoid of any part having a dangling end.

55. A stud as recited in any of claims 51 to 53, wherein said web comprises:
a plurality of longitudinally alternating, upper and lower integral web parts each extending laterally between and joined to both of said inner and outer flanges; and a plurality of laterally extending slits each separating adjacent upper and lower parts.

56. A stud as recited in claim 55, wherein said web is devoid of any part having a dangling end.

57. A stud as recited in claim 51, wherein:
said inner flange comprises an upper portion having a double thickness of sheet metal; and said guiding means comprises means for directing a portion of said core board, adjacent its lower edge, toward a location adjacent said upper portion of the inner flange.

58. In combination with the stud of claim 51:
a vertically disposed, first core board, havring an upper edge;
means on said stud web for engaging said first core board adjacent the upper edge thereof to support said stud in a horizontal disposition atop said first core board; and means on said stud for holding each of said core boards adjacent the inner flange of said stud and spaced from the stud's outer flange.

59. A formed, elongate sheet metal stud for horizontal application in a hollow wall as defined in claim 1 including a core board, said stud comprising:
an elongate inner flange;
an elongate outer flange; and an elongate web extending laterally between and joining said inner and outer flanges; and a plurality of laterally extending slits each separating said web into adjacent upper and lower parts;
means for holding two boards against said inner flange spaced inwardly from said outer flange, said means for holding one of said boards against said inner flange comprising a channel formed by an acutely angled portion of said web and said inner flange, said acutely angled portion of said web extending outwardly from closely adjacent said inner flange forming an acute angle with said inner flange.

60. A stud as recited in claim 59, wherein:
said web is devoid of any part having a dangling end.

61. A stud as recited in claim 59, wherein said upper web part comprises:
a first portion extending laterally from said inner flange toward said outer flange;
a second portion extending upwardly from said first portion, away from said inner flange; and a third portion extending downwardly from said second portion toward said outer flange.

62. A stud as recited in claim 61, wherein said lower web part comprises:
a first portion on the lower web part, extend-ring laterally from said inner flange toward said outer flange;
a second portion on the lower web part, extending downwardly from said first portion on the lower web part, away from said inner flange; and a third portion on the lower web part, extend-ring from said second portion of the lower web part toward said outer flange.

63. A stud as recited in claim 62, wherein:
said second portion on the lower web part is disposed substantially parallel to the third portion on the upper web part.

64. A hollow wall extending upwardly from a floor to a height substantially greater than about 12 feet (3.66 m), said wall having an inner side and an outer side and comprising:
a pair of vertically disposed, horizontally spaced posts;
a plurality of horizontally disposed, vertically spaced, elongate, formed sheet metal studs each having a pair of opposite ends;
each stud having an inner flange, an outer flange and a web extending laterally between and joining said flanges;
a plurality of core boards each having a pair of opposite side ends, an upper edge and a lower edge;
means on each post for receiving a respective opposite end of each stud and of each core board;
means on each stud for engaging one core board adjacent the upper edge thereof to support said stud atop said core board;
means on each stud for engaging another core board adjacent the lower edge thereof to support said core board atop said stud;
means on each stud for holding each of said core boards, engaged by said study, adjacent the inner side of said wall and spaced from the outer side of said wall; and means on each stud for mounting wall board adjacent the outer side of said wall and spaced from said core boards which are adjacent the inner side of said wall;
all of the horizontally disposed studs in said wall having the same lateral dimension and the same thickness.

65. A hollow wall, as recited in claim 64, wherein:
all of said studs having a lateral dimension of about 2.5 in. (6.35 cm.).

66. A hollow wall as recited in claim 64 or 65, wherein:
all of said studs have a thickness of about 0.020 in. (0.5 millimolar.).

67. A hollow wall as recited in claim 64 or 65, wherein:
said wall has a height between 14 and 16 ft.
(4.27 - 4.88 m.).

68. A hollow wall as recited in claim 66, wherein:
each core board in said wall has a height of about 2 ft. (0.61 m.).

69. A hollow wall as defined in claim 1 wherein said means on said stud holding said core board edges comprises tabs cut and bent out from said stud web.

70. A hollow wall as defined in claim 5, wherein said webs and said ceiling tracks have vent holes for air circulation.

71. A formed elongate sheet metal stud as defined in claim 8, wherein said means for holding two boards against said web comprises tabs cut and bent out of said web.

72. A formed elongate sheet metal stud as defined in claim 8, wherein said acutely angled portion is angled at about 60°.

73. A formed elongate sheet metal stud as defined in claim 8, wherein said acutely angled portion is a portion of an upwardly extending tab.

74. A stud as recited in claim 11 wherein said second portion on the downwardly bent web portions is disposed substantially parallel to the third portion on the upwardly bent web portions.

75. The method of claim 12, wherein said core boards are spaced inwardly from said outer flanges by tabs cut and bent out of said web.

76. The method of claim 14, wherein said bottom edge is positioned against said inner flange with said acutely angled web portion and a bevelled edge on said core board lower edge both acutely angled at about 60°.