US2185494A - Bookstack - Google Patents

Description

W. C. BOND Jan. 2, 1940.

BOOKSTACKY 4 Sheets-Sheet 1 Filed June 28, 1937 E if s w me E g E m RE i IN V EN TOR.

, ATTORNEYS.

W. C. BOND Jan. 2, 1940.

BOOKSTACK Filed June 28, 1937 4 Sheets-Sheet 2 IN V EN TOR.

' A TTORNEYS.

Jan. 2, 1940.

w. c. BOND 2,185,494

. BOOKSTACK Filed June 28. 1937 4 Sheets-Sheet 3 INVENTOR.

BY Z 4 f A T T ORNE YS.

Jan. 2, 1940. c, D 2,185,494

BOOKSTACK Filed June 28, 1937 4 Sheets-Shae- 4 INVENTOR. 32 Y M c 3M A TORNEYS.

PatenteclJ an. 1940 1 2,185,494 nooxs'rscx H William 0. Bond, 'Washingtqn, n. o." Application Jun e28, 1937-, Serial No. 150,793

23 Claims. (01. 211-135) (Granted under act of March 3,,"1883; as

. ame'nded April 30,1928; 37-0 o. G. 757) The invention described herein may be manufactured and used by error theGovernment of the United States for governmental purposes without the payment to me of an-y royalty '5 thereon. I

The object of this invention is to provide sim plicity in construction and erection of a type of mul'ti-tiered convertible bookstack which includes in its design means within the building 10 structure for ventilation of the superimposed decks Another object is to provide. a design of multitieredbookstacks in which the elements that are used to provide supports for the bookscan be '15 readily compacted or'removed and the space used for other purposes. 1 1

'While another object is to provide vertical supports, for supporting the superimposed decks I and the bookstacks therein, whichare adapted to 20 form conduits for air conditioning :the decks, housing for water and electricity conduits, as well as housings, conduits or passageways for other equipment usually necessarily exposed in building structures.

.25 Other objects and purposes "or my invention will become apparent from the following descrip tion and the accompanying drawings, it being understood that the above generalustatements of the objects of my invention areintended-to 3o broadly explain the same without'limiting it in any manner. 1 I

The accompanying drawings are illustrative examples of building and booksta'ck structures having the characteristics of my =inventin'and 35 by which the same may be practiced.

Figure 1 is an elevational view of a section of a vertical hollow column and of bookshelf supporting panels next above and below one floor level of a tier, the floor and horizontal support-'- 40 ing bars or beams being in cross section. Figure 1 is taken at line |-l of- Figure 2, which illustrates a cross-sectional view taken at line 22 of Figure l and -termina-ting at 2--2 thereof. 1

Figure 3 .is a perspective of a section similar to that shown in elevation in Figure 1.

Figure 4 is a vertical sectional view taken at line 4-4 of Figure 3.

5 Figure 5 illustrates an adjustable spacer carried by the. shelf-supporting panel for spacing the same from the vertical column;

Figure Sis a perspective illustrating a section or one tier of the assembled bookstack. 55 Figure 1'7 is .a view in perspective of a section of a horizontal Z-bar adapted to support floor plates and shelf-supporting panels.

Figure 8v is-an elevational view. of portions of the face of theshelf-supporting panel illu'stratv ing, in cross section, the application of a shelf-. 5

dividing barrier or curtain. This view istaken at line 88, of-

Figure. 9 which is taken at line -9-9 of Figure8. t

Figure 10 illustrates a cross-sectional view of 10 a modified form of horizontal supports a portion of which isadapted to serve as a floor plate. i

My invention comprises, as illustrated in the drawings, a vertical supportingcolumn I!) having a pair of channel-formedbeams ll arranged so that the channel-forming flanges l2. of the respective beams project toward each other so that thecorners of the channel beams form the corners of the column, (See Figures 2 and 3.)

The beams 'll of each column" are spaced from each other sufiiciently to provide a column of desired or required width and/or sufficiently to provide a desired or required space area between and within the facing channels IS. The channel beams are retained in a predetermined vertical spaced relation by'horizontal members M, which are preferably angle irons, Theangle irons are .iixed horizontally, by such as bolts passing through the vertical leg [5 thereof, to the outer sides of the beam flanges l2, on'opposite sides of the column Ill, parallel to each other, preferably at floor levels," with their respective horizontal legs l6 uppermost and projecting laterally and outwardly in opposite directionsfrom the sides of the column; lithe-channel beams ll are spaced from each other sufficiently' to cause a space between the edges of the flanges l2. of

the respective beams, .or, in other words, if the flanges 12 of the respective beams are of insufiicient width to contact each other by reason 40 of the spacing of the'beams, then a filler plate or sheet of material I! is fitted Verticallybetween the edges of the respective flanges 12 and on a plane therewith supplementing the action of the angle :iron in maintaining the spaced relationship of the channel-formed "beam. The

. plates 11 are carried by, and vertically parailel to, the intermediate portion of the verticalleg 15 of the angle iron =14, The plates H are thereby fixed between the edgesof the flanges l2 of the respective beams H at floor levels and serve as an enclosure for the hollow column at and through the floor "levels where it is difficult to other-wise complete or continue the column enclosure. I

Viewing a section of the column from a flangethe two H-shaped structures are spaced and connected by the integral webs of the channel beams H which form the other two sides of the column. When the horizontal parallel angles M com-1"" bined with plate H are bolted to the outer sides of the beam flanges l2 the plates ll form con tinuous interposed surfaces-with'the flanges to" which are applied panels l8. These panels extend from floor to ceiling and overlap a portion I of the plates 51 and beanrflanges l2 to which theyare fixed by such means clips, or screws. Y g

By the structure thus far described the hollow column it is formed. 7 The passageway is formed within the column may be used as an air conduit for air conditioning the structural area in which the'column is utilized. By the term air conditioningit is intended to include cooling, heating by steam or hot air, ventilating, drying, humidifying and similar'purposes to which air or gas may be used.

The passageway i9 may also be utilized for the housing and passage of conduits for electricity, air, steam or gas, and water or other liquids, and also as a passage and housing for vacuum or pressure tubes forcleaning and pneumatic carriers, as apassage and housing for article'conveyors, and as a passage and housing for other equipment usually necessarily exposed in bookstack constructions as well as in other types of building structures. 7

The panels 58 are readily'removable whereby free access to the passageway l9 and the equipmentho used therein may be had forrepairs, installation, for painting to' prevent rusting and corrosion, for cleaning and the like.

When the passageways I 9 are used as supply conduits for air conditioning, the columns l0 are provided with exhaust nozzles, jets, vents, ducts,

or the like, 20 which communicate with the conduit." These exhaust nozzles, or the like, are

preferably located near the top of the column 10,

i. e., so much of the columnas is within a deck. They may be provided with any suitable cut-off means or dampers whereby the exhaust ports may-be entirely closed, decreased or restricted so their action can be made uniform not only over the entire deck but throughout the superimposed decks although the various exhaust ports may be served by the same conduit.

The nozzles are preferably provided with deflectors' and are positioned'near the top of the deck in order that the air exhausted from the columns may not directly strike an occupant or worker and in order that cooled or conditioned air exhausted therefrom may take its natural course and'filter downwardly through the deck.

In the use of the columns ill for air conditioning, the column is also provided'with intakes such as registers 2! preferably located near the floors of the decks for exhausting the air from the decks that is used as it filters down through the decks from the nozzles 29. The intake register 2! may preferably-be located beneath the bookstacks, to

- be described hereinafter, and thereby draw any dustor the like, that'ordinarily accumulates beneath shelves, into the conduit. This register is 2,185,494 g also provided with suitable cut-ofi means or as bolts, spring;

dampers for purposes similar to those stated in connection with the exhaust nozzles 20.

In order that there be no conflict in the cycle, of' the air, it is, of course, necessary that the intake register 2! communicate with a return conduit separate from thesupply conduit.- This is preferably accomplished by either omitting the intake register 25 from the columns supplying theexhaust nozzles 29 or if not omitted by closing the intake register 2! on the supply column and then reversing the order on some other column, preferably the next adjacent one, and

utilizing the second column as an exhaust for drawing the air from the decks.

The construction of the type of column described provides a substantial vertical support for building s, decksand framing members as,

well'asfor direct and indirect supports'for shelf-f supporting membersbfor bookstacks. .For' the foregoing uses, like parallel columns are erected in straight lines predetermined intervals and are connected in their relative position's'by hori zontally disposed means adapted to prevent; lateral displacement of the columns and which are also adapted to support deck flooring as I well as support shelf-supporting means to be de- The latter horizontally dis scribed hereinafter. posed means may consist, as shown, of pairs of parallel and horizontal beams 1Z2 attached to opposite edges of the columns at floor levels. These beamsare formed so as to provide a vertical web portion 23 having horizontal flanges 24 and 25 projecting laterally, horizontally and at right angles'to the vertical web but in opposite directions from the upper and lower edges of the vertical portion. The lower-horizontal flange 25 is in turn provided at its outer-edge with 'an up turned vertical portion 26' at right angles to. the flange 25 and substantially parallel with the web portion 23. The beam is referred to hereinafter as a Zee, or Z beam. In the utilization of the Z beams one of each pair is reversed end for end in order that the horizontal flanges or legs 24 project in opposite directions. In the installation of the Z-beams the ends are coped to fit the corners of the channelbeams H, i."e., the

end portions of the horizontalflanges or legs 25 and the end portions ofthe vertical upturnedv flanges 26 are removed and the newly. formed ends of the latter portions 25 and 26 are brought into contact with the outer sides of the flanges-l2 of the channel beams, while the vertical webs 23 of the Z beampass alongthe outer side of-the web or thechannel beamsand aresecuredthere to. The upper horizontal flanges or legs 24 of g the Z beam also continue along the edges of the columns I ii on a plane with the horizontal flanges or legs I6 of the angle irons it installed along the sides of the columns. A horizontal flange thereby extends laterally from each edge and side of the'columns at floor levels which flanges are adapted to support flooring or floor plates 21.

Additional means may be provided for supporting the floor plates, and load thereon, between the rows of columns and may consist as shown, of T-shaped beams 28. These beams are installed preferably from one row of columns to another and may be attached to'the channel beams H. The end portions of the T beams are coped to fit the horizontal'flanges 2t and contact the vertical flanges 23 of the Z beams, i. e., the end portions of the cross-bars 29 of the T beams are removed and the newly formed ends thereof are brought intQJabutment, and. on a ares-no.4

. adapted for .useingeneral building construction,

is particularly adapted for the supportof and :service to bookstacks, particularly bookstacks of the following character which is a part of my I invention and adapted :for conjoint use, therewith. 3

My bookstack comprises a plurality of relatively thin uprights or shelf-supporting "sections 32 disposed at predetermined intervals vertically between the columns ill and transversely of the column-connecting Z beams. Thesections 32 are preferably gridded in such a manner as toprovide upper and lower end bar portions '33 and side bar portions 35 and centralbar portions 36. The openings 3'! forming the gridded portion are preferably arranged :in verticaland horizontal rowswhere'by there is provided-vertical and horizontal supporting bar portions 38 and 39, respectively, connecting the upper and lower end bar portions 33 and 34 and the side and central bar portions '35 and 3b.

Redescribed, the section 32 comprises a thin vertical panel-like. section or upright having a yoke :33 across the upper end thereof with vertical side, centraLand intermediate barportions 3.5, 36, and 38 depending therefrom and horizontal bar portions M and 39 connecting the ends and intermediate portions :of said side, central, and intermediate vertical bar portions 35, 36 and 38.

. The sections 32 are carried by and upon portions of pairs of the overhead .2 beams. To accomplish this the sections are provided with hooks or lugs M1, preferably trochoidal in shape formed in, on, by, or projecting from the ends of the upper end bar portion or yoize 33 which are adapted to engage and carry the sections 32 upon the horizontal and vertical flanges and 26 of the Z beam-22. The sections .32 are provided with centrally located laterally projecting superposed lugs 4! and lugs or notches '42 on or in the edges of the section or side bar portions 35, which means ll and i-2 are adapted to receive and support ends, or means on the ends, of bookshelves disposed between adjacent shelf end supporting sections.

To locate and maintain the sections 32 on proper centers and prevent lateral displacement, the vertical upturned flanges 26 of the overhead 2 beams 22 are provided with notches 13 at predetermined intervals, which notches are adapted to receive and retain the lug or hook portions ill of the sections 32. In addition to the latter re taining means for the sections, other means are provided for locating and maintaining the lower ends thereof on proper centers, against swinging and against tortional or lateral displacement. These means may consist of a pair of horizontal bars or rails, preferably a pair of horizontally parallel angle rails it attached transversely across the lower edges of the sections. For attachment purposes, horizontally surfaced lugs Mi, formed by projections or notches, are provided :on the'ends of the lower end bar portions 34 of the sections and are formed so as to receive :one leg of the angle rail transversely upon the rsurfacepof the lugs 45 with the other leg of the angle rail depending transverselyacrossthe ends :of the lugs.

The rails are then removably secured -to the lugs by means such as screws 4E5 passing either through holes, located at predetermined intervalson a center line vertically coinciding with the notches 43 in the z beam, in the horizontal flanges .oi the angle rail and into the "surface of the lugs or through holes in the verticalflemgesiof therails into the ends of the lugs. These section-tieing and positioning rails 44 extend from one column ll! to another but are not secured thereto, they are instead coped or :notchecl to contact and fit against and about the cornersof the channel beams M of the columns which maybe accomplished by removing a sunlcient portion of the horizontal flanges of the rail M to allow the same to fit horizontally between tWo columns, and thereby prevent a 1ongitudinal movement of the assembled .bookstack.

The vertical flanges of the rails areallowed to extend along the outer surface-of the Web of the channel beams H and thereby form means for preventing edgewise movements of the sections or the assembled bookstack.

It will thus be seen that this construction provides a. most simple andaccurate means for assembling a convertible 'bookstack and maintaining its upright members in alignment. The uprights-are held absolutely on their proper centers at 'each oi their corners, and twisting or warping is prevented by the rails it being notched at their ends over the channel beams I i.

In order to remove a book range it is only necessary to remove the screws 46 which fasten the parallel angle rails M to the upright sections "32. The upright sections may then be lifted out of the notches t3 and compacted one against the other or turned slightly and removed entirely for the utilization of the space between the columns for other purposes. No part of the bookstack proper is attached or fastened to the structural members, the bookstack being merely supported upon and braced against the overhead horizontal beams and vertical columns. Slight variations in the structural members can occur without in any way affecting the proper alignment of the bookstacl; since its alignment is controlled by properly locating the notches 43, the holes in the angle rails M and the notches on the ends of the rails M.

A modified type of horizontal supports for the floor plates and upright sections is illustrated in Figure -10. By reference thereto itwill be seen that in lieu of the 2 bars 22, I propose to utilize a horizontal support having a pair of vertical webs. 23, a pair of horizontal flanges 25', similar to those respective members of each pair of Z bars 22. The horizontal flanges 24 of the 2 bars are, however, omitted in this modification and the vertical webs 23 continue into a connecting floor plate 2'! and at right angles thereto. At the junction between the vertical webs 23 of this modification, and. the floor plate 21, an exter-ior right angular indentation 2d is provided for the receipt and support of the next adjacent The curtains 41 are provided at their upper ends with a reinforcing T-shaped strip 48. The stem 49 of the T-shaped strip is either double or provided with a groove into which the upper edge of the curtain is inserted and secured to the embracing stems 49 of the T-shaped strip. The cross head and divided stems of the T- shaped strip are allowed to project beyond the edge of the curtain where the pair of stems are spread jaw-like, as at 5B of Figure 9, beneath the cross head which caps the opening between the jaws 58. Similar jaws M at the bottom of the curtain are also provided and allowed to project from the edges of the curtain. The lower jaws 5| are formed by strips applied to the opposite faces of the curtain and their projecting ends flared or spread. At their lower ends the steel curtains are bent back on themselves and thence at right angles to the panel to provide the necessary stiflness to the bottom of the curtain and also to provide a horizontal member 52 adapted to project beneath the lower shelf 53 indicated in dotted lines, Figures 8 and 9. Lugs 53 and 55 adapted to receive the jaws 50 and 5| are provided on the central bar portion 36 of the upright sections 32 preferably between the rows of superposed shelf-supporting lugs 4|. In position, lateral displacement of the curtain is prevented by the jaws while a downward displacement is prevented by the projecting cross head of the T-shaped strip 48 which rests upon the lug 54 and supports the curtain thereon. An upward displacement of the curtain is prevented when the lower shelf 53 is in position and overrides the horizontal flange 52 of the curtain. De-

tachable doors (not shown) may also be provided and pivoted in holes 56 provided in the horizontal flanges 25 of the 2 bars 22 and in the horizontal flanges of the angle rails 44. When the doors are locked it is then impossible for the lower shelf to be moved forward and the curtain is therefore locked in place without the necessity of using any separate applied mechanical fastenings.

The upright sections 32 on the ends of the ranges may not always fall in contact with the columns ID, by reason possibly of slight varia tions in structural manufacture, and in order to prevent a lateral flexing of the upright sections toward the columns, counter-sunk screws 5'! are provided (see Figures 5 and 6) in the side bar portions 35 of the sections, which screws are threaded through the bar portions and adjusted to bear against the passageway column and thereby retain the section against an outward lateral flexing, i. e., toward the column.

What I claim is:

l. A rectangular structural column having a passageway therethrough, comprising a pair of spaced channel-formed beams disposed to have their webs form the respective edges of the column and disposed to have their respective pairs of flanges project toward each other to form side portions of said column, in combination with a pair of panel-like members attached to the respective sides of said column by means removably connecting the side of said panel-like members to the outer sides of the column side-flanges, and plate-like means disposed intermediate the edges and in the plane of said column sideflanges and inwardly overlapping ends of side panel-like members.

2. A rectangular vertical structural column, having a passageway therethrough comprising a pair of spaced channel-formed beams, the flanges of which form sideportions of said rectangular column, in combination with a plurality of pairs of panel-like members vertically superposed upon a the respective sides of said column and applied to the outer sides of said channel beams inthe column and disposed to have their respective pairs of flanges projecting toward each other to form side portions of said column, in combination with a pair of panel-like members removably attached to the respective sides of said column, spacing means applied to the outer sides of said column at intervals therealong and connecting said flanges, a plate carried by each of said spacing means designed to flt between the edges of said flanges and to'inwardly overlap ends of said panel-like members.

4. A rectangular vertical structural column havinga passageway therethrough, comprising a pair of spaced channel-formed beams, the webs and flanges of which formside portions of said rectangular column, in combination with floor supports along the flange formed side of the column and attached to said flangesand constituting spacing elements for said channel beams at floor levels along said vertical column, and plates lying in the plane of said flanges and attached to each said floor supports and extending above and below said supports to form with said webs and flanges a smooth rectangular column extending through said floors, and a panel-like member overlapping said plates and said flanges to form a passageway within the column between floors.

5. A rectangular vertical structural column having a passageway therethrough, comprising a pair of, spaced channel-formed beams, the webs and flanges of which form side portions of said rectangular column, in combination with plates lying in the plane of said flanges at floor levels along said column and forming with said webs and flanges a smooth rectangular casing at said floor levels, panel-like members overlapping said plates and said flanges forming a substantially rectangular casing between said floor levels.

6. Building construction including a hollow structural column formed of a pair of channelformed beams the webs and flanges of which define the sides of the column, and a pair of horizontal parallel floor supporting beams each having a portion passing alongand attached respectively to the webs of said channel beams at opposite sides of the column, in combination with a pair of horizontal parallel spacing members attached to the flanges of said channel beams at the other sides respectively of the column, said spacing members having floor supporting flanges forming a planer surface with said floor supporting beams. g

'7. Building construction including a hollow structural column formed of a pair of spaced channel-formed beams the webs and flanges of which define the sides of the column; and horizontal parallel supporting beams attached to and supported by the webs of said channel-formed beams, in combination with horizontal bar-like supporting members attached to the flanges of said channel-formed beams and located between said hor izontalsupporting-beams, plate -li ke -mem-' attaches:

f oi med beams; and a pa'nel-like member in oven-= lapping engagement with said flanges said I plateelilte members.-

' 8. Building construction including: a vertical hollow structural column comprising a pair of channel-formed beams-thecorners oi which form thecornersofsaidcolumn,- an'd' a pair (if-Bangle iron supp'orts disposed horizontally along opposite sides otthe column with their horizontal legs uppermost,-in combination with a of supporting beams each having a vertical web: and upper and lower flangeprojectingreverse'ly' from said web; said loiver flange being copedlt'oe allow the upper flange and the vertical web'o'f the beam-to pass along the side oi the column at right angles to said angle iron supports and to allow its lower flange to abuttinglycontact the side of the column, andmeans passingthrough the webs of the supporting beams and the web-of the channel beams for supporting the upper-flanges of said supporting beamson a plane with the horizontal legs of the angle iron supports.

9* Building oenstruction including a vertical hollow structural column Comprising a pair, of channel-formed beams the corners of which form the corners of said colum.n,.and a pair of angle iron supports disposed horizontally along opposite sides of the column with their horizontal legs uppermost, in combination with a pair of supporting beams having vertical webs and upper and lower flanges coped to allow the upper flanges and the vertical webs thereof to pass along the sides of the column at right angles to said angle iron supports and to allow their lower flanges to abuttingly contact the sides of the column, means'passing through the web of the,

supporting beams and the web of the channel beams for supporting the upper flanges of said supporting beams on a plane with the horizontal legs of the angle iron supports, additional sup.- porting beams having vertical webs and horizontal flanges, said horizontal flanges being copied to transversely abut against the horizontal flanges of said pair of supporting beams with the vertical webs of the additional supporting beams transversely in abutment with the vertical webs of the pair of supporting beams, and means for supporting the horizontal flanges of said additional supporting beams on a plane with the horizontal legs of the angle iron supports and the upper flanges of said supporting beams.

10. Building construction peculiarly adapted to support library book-shelves including a vertical column, a pair of supporting beams each having a vertical web and an upper and lower flange extending reversely from'said web, saidlower flange being coped to allow the upper flange and the vertical'web of each beam to pass along the side of the column and to allowits lower flange to abuttingly contact the side of the column, and a shelf support carried upon and depending from the lower flanges of said supporting beams.

11. Building construction adapted to support bookracks including a vertical column, a pair of supporting beams having vertical webs and each having an upper horizontal flange projecting from one side of said web, and each having 'a lower flange projecting from the other side of said web, said lower flanges being coped to allow the upper flanges andthe vertical webs of the beams to pass along the sides of the column and tact the-sides of: the column; the:1ower=:flanges-of said supporting beams being: provided with an upturned serrated edge, and: a-shcli; support interlocking with said-serrations and depending from the lower" flange of said beam;

- 121 end section for bookst'acksand means fbr supporting: the same comprising: asubstantially rectangular panel and spaced parallel beamsgmeans-on the face and edges of said panel for supporting shelves, and-a lug located at each upper outer corner of said' panel, said panelbeing supported in tension upon said beams by lugs acting: in shearing stress.

endsectionfor b'ookstacks and means located at each upper outer cornerof said panel resting onsaid" beams and? constituting the sole supportinghieans for supporting said panel in tension.

142;. An: end section for'bookstacks and means for su po-rtingthe' same comprising a substantially rectangular panel and spaced parallel beams means enths "face and-edges of sai'd pa-ne'lfor supporting shelves, and trochoidal shaped lugs on said panel acting in shearing stress upon said beams and suspending said panel in tension.

15. A boolistack comprising a pair of parallel spaced elevated beams supported by upright members, and shelf supporting panels supported solely by said beams, said panels being provided at their upper ends with yoke-like portions bridging the space between said elevated beams, the ends of said yoke-like portions resting upon said beams and suspending said panels in tension.

16. A bookstack comprising a pair of parallel spaced beams elevated by supports, shelf supporting panels provided at their upper ends with yoke-like portions bridging the space between said elevated beams, the ends of said yoke-like portions resting upon said beams and suspending said panels in tension, and means upon said elevated beams engaging the sides of said yoke-like portions to maintain the upper ends of said panels in parallel alignment.

17. A bookstack comprising a pair of parallel spaced beams elevated by supports, shelf supporting panels provided at their upper ends with yoke-like portions bridging the space between said elevated beams, the ends of said yoke-like portions resting upon said beams and suspending said panels in tension, means upon said elevated beams engaging the sides of said yoke-like por tions to assist in the maintenance of said panels in spaced parallel alignment, and spacingmeans engaging said panels at points removed from and relation to each other and to said columns.

1 9. In combination with end sections for a bookstack, lugs centrally located on said end sections near the top and bottom thereof, and a metallic curtain, means on the curtain near the bottom thereof engaging the sides of said lower lugs, and means on the curtain near the top thereof engaging the top and sides of said upper lugs.

20. In combination with end sections for a bookstack, shelves carried by said end sections, lugs centrally located on the faces of said end sections near the top and bottom thereof, a metallic curtain positioned between said end sections, the lower portion of said curtain being bent back upon itself and provided with a laterally projecting flange engaging the lower surface of one of said shelves, reinforcing members attached to said bent back portion and extending beyond opposite ends of said curtain for engagement with the sides of said bottom lugs, and a reinforcing T-shaped member having bifurcated leg engaging opposite sides of the upper edge portion of said curtain, end portions of said T-shaped member extending beyond the opposite ends of said curtain and engaging the top and sides of said upper lugs.

21. In combination with end sections for a bookstack, lugs centrally located on said end sections near the top and bottom thereof, a metallic curtain the lower end of which is bent back upon itself, means attached to said bent back,

portion, extending beyond the ends of said curtain, and engaging the sides of said bottom lugs, and a reinforcing member of pressed sheet metal engaging the top of said curtain, extending beyond the ends thereof, and engaging the top and sides of said upper lugs.

22..In combination with end sections for a bookstack, lugs centrally located on the end sece tions near the top and bottom thereof, a metalhe curtain provided with reinforcingmembers extending beyond the ends of said curtain with the extending portion of one of said reinforcing members in engagement with the sides of one of said bottom lugs and that of the other in engagement with the top and sides of one of sai upper lugs.

23. In combination with end sections fora bookstack each having a lug centrally located near the'top thereof, a metallic curtain provided with a head and side reinforcing member extending beyond the ends thereof and in engagement with the top and sides of said lugs, and means for locking said curtain in position.

WILLIAM C. BOND.

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