US2025833A - Blackboard construction - Google Patents

Description

1935. N. c. SOiQENSEN BLACKBOARD CONSTRUCTION Filed NOV. 16, 1931 aiii Z 5/37? W f M w/ 6'9 5 7 7 44 m 4 4 z 4 1P1 6A 4 4 fi M6 4 6 1 WW w i f 6 9 H 9 7 w V 5 a M INVENTOR ATTORNEYS.

- Patented Dec. 31, 1935 I v Q S TAT S BLACKBOARD CONSTRUCTION Niels C. Sorensen, Detroit, Mich.

Application November 16, 1931, Serial No. 575,263

9 Claims. (01. 35-65) .This invention relates generally to building For a better understanding of the invention, construction and relates particularly to the conref rence may now be had to the accompanyin struction of display boards such as blackboards drawing forming a part of this specification, in and bulletin boards employed in classrooms, con- Whichference rooms, laboratories and elsewhere. Figure 1 is a fragmentary side elevational view An object of the invention is to provide a more of the interior of a room containing a blackboard c n i u plan of t ti for b1 kb ds 4 and bulletin board constructed in accordanc'e'with and bulletin boards than has heretofore been the principles of this invention;

employed and one which will not require the Fig. 2 is a transverse sectional view of said employment of numerous blackboard casing and W l ta en substantially On line 22 of Fig. 1; 10 molding l t projecting utwardly from a Fig. 3 likewise is a transverse sectional view building wall in such manner as to be not only f S W211 illustrated y g- 1 ta en Substandispleasing in appearance to ordinary persons but tlally line thereof;

relatively unsanitary because of the facility of 4 is a nt ry transverse sectional I5 such elements for collecting dust ordinarily review taken substantially on l of is moved therefrom only at infrequent intervals. 5 is a View Similar to 4 taken Substan- Another object of the invention is to provide tially 01111116 of fo t construction of blackheads, huhetin Fig. 6 is a fragmentary transverse sectional view boards, etc., conforming to more or ess modern- 0f the l illustrated by F 1 and is taken subistic principles of design of simplified or unitary StantiallY On line 5 thereof. 20 construction easily and quickly assembled which Referring particularly to e fi ures of the are more suitable to the contracting and subdrawing, a Wall W 0f any room 1' d g in contracting methods now generally employed in which a blackboard or bulletin board embracing building n t u ti the principles of this invention is employed, com- Another obje t of t h tm is t employ prises a supporting Wall structure I! which, in the 225 sheet metal casing elements in the construction present instance, ts O a vertically disD of blackboards and other similar articles which Concrete Slab, although it may consist in other can be restricted in application t region in a instances of wood, tile, brick, stone, channel and wall which is Substantially Within the exterior metal lath, gypsum, or any other material suitable rfac thereof and which metallic and other for the construction of the walls of buildings. 30 elements can be employed not only {0 defining During the construction Of the wall blocks the region Occupied by such blackheads, etc and i2 of wood or other suitable material are inserted for restricting plastering and the like therefrom therein at regular intervals ee Figs. 2, 4 and 5) but for retaining such blackboards, etc. in p0 and to which blocks various kinds of wall fixtures 33 tion within the wall. ay be attached 35 Heretofore it has been customary to nail or In the Pl Instance a p ty f the blocks otherwise secure preferably wood or th suitl2 are so inserted in the concrete wall II as to able members to a rough and unplastered wall Support a frame qan Opening 01 egion not only to define the region in which a blackor recess i l in which a blackboard l6 and a board, for example, was to be installed but to bulletin board are locatedto receive nails from or otherwise to support mold- In general the frame Comprises a Pair of ing or casing members projecting outwardly vertically disposed and spaced side sections l8 and yond t finished wall and employed fo t IS, spaced top and bottom sections 2! and 22 repurpose of retaining the blackboard in position spectively, and a ed ate section 23.

and for covering from View the unsightly wood The pp Section (See Figs- 1 a d COm- 45 members and the adjacent edges of the plasprises a pair of sheet metal members 24 and 2B baring, between which a wooden or other suitable member The plan of construction embracing this inven- 2! is secured. The sheet metal member 26 which tion proposes to do away entirely with h is disposed between the wooden member 21 and 59 outwardly projecting casing or molding elements the concrete wall I I, has an outwardly projecting and to so modify the construction of the wood flange along the upper edge thereof, the height members heretofore employed as by employing of which determines the thickness of the inner sheet metal members therewith as to accomplish finish coating or plastering 29 of the wall and deall of the purposes which such construction defines the upper extremity of the region in which mands. the blackboard l6 and billboard I! are installed. 55

Referring to the upper portion of Fig. 2, the outer sheet metal member 25 is provided with a similar flange 3i except that the latter projects inwardly along the inside surface of the flange 28. The wooden member 21 and the sheet metal member 26 are both secured to the wall H by screws 32 extending therethrough and into the wooden blocks !2 forming an integral part of the wall 5 I, while the outer sheet metal member 24 is secured to the Wooden member 2? by screws 35. Adjacent the lower or inner edges thereof the sheet metal members 2 3 and 26 are deflected toward each other, as indicated at 33, to provide supports or supporting flanges 34 and 36 between vhich the upper edge or" the bulletin board ii is confined.

The bulletin board ill is constructed of any suitable relatively soft material in which pins or tacks can be readily inserted and removed, for example, such as cork, paper board, wood, etc.

The supporting flange 3 3 at its lower edge is provided with an upwardly turned flange portion 37 behind which hooks 33 are removably supported at desired intervals.

In the lower portion of Fig. 2, the intermediate section 23 between the bulletin board l! and the blackboard I6 is shown which likewise comprises an inner sheet metal member 39, a wooden or other suitable member ill and an outer sheet metal member 22. The inner sheet metal member 39 and the wooden member t! are secured rigidly to the wall I I with the inner sheet metal member 33 between the wooden member a l and the wall by screws 33 projecting through both members and into blocks i 2 hereinbefore referred to. The edge of the inner sheet metal member 39 is offset, as indicated at 4:3, to provide a supporting flange 4E similar to the flange 36 of the sheet metal member 25 and cooperatim with said flange 38 to support the rear of the bulletin board H. The outer sheet metal member 42 extends over the adjacent edges of the bulletin board I l and the blackboard l6 and there is provided with inwardly extending flanges 4'! and 48 which abut the front surfaces of the bulletin board and blackboard and assist in retaining such elements in position. Screws 69 are employed for retaining the front sheet metal member 22 in position against the front surface of the wooden member H The blackboard H5 is constructed of slate or of such composition boards as those embracing wood pulp, asphalt, concrete, asbestos or other materials suitable for the purpose.

As illustrated in Fig. 3, the lower extremity of the region or recess is is defined by a relatively wide wooden member 5! which is secured against the wall Ii. by screws 52 extending through such member and intothe blocks [2. A chalk trough 53, preferably formed from a single sheet metal of any suitable character into a suitable sect1on such as that indicated in Fig. 3, is secured to the front surface of the wooden member 5| by screws 54 and 56 projecting through the vertically disposed back or plate portion ofthe trough and into the member. A lower edge 57 of said back portion of the trough 53 projects downwardly to such an extent as to cover the adjacent edges of the wooden member 5| and the inside finishing coating 29 of the room. The upper edge 53 of said back portion comprises an inwardly extending flange 59 which abuts the front surface of the blackboard l6 adjacent the lower edge thereof and hence cooperates in maintaining the blackboard in position within the wall. Daubs of concrete, plaster, or other suitable material, indi cated at 6 l, cooperate with each other to maintain the blackboard l6 outwardly with respect to the wall ll and against the edges of the front sheet metal member 32 and the portion 59 of the chalk trough 53.

The side section l8 (see Fig. 6) comprises an inner sheet metal member 62, an outer sheet metal member 53 and an intermediate wooden or other suitable member 64 which is secured to the wall H on the outer surface of the inner member 62 by screws 5%; projecting therethrough and into the blocks l2. The outer sheet metal member 63 is secured to the outer surface of the wooden member 64 by screws 61. The inner sheet metal member 62, like the inner sheet metal member 26, is provided with an outwardly projecting flange 68 adjacent one edge thereof which defines one side of the region I and retains the finishing coating 29 of the room in position during the hardening process of the latter. The corresponding edge of the sheet metal member 63 is provided with an inwardly extending flange 69 which projects along the inner surface of the flange 68.

The opposite edge of the outer sheetmetalmember 53 is provided with a portion extending outwardiy over the adjacent edge of the blackboard l6 and having an inwardly projecting flange H which abuts the front surface of the blackboard and tends to retain the latter in position.

In the region adjacent the bulletin board I] the flange H of the outer sheet metal member 63 there engages the bulletin board rather than the blackboard and likewise serves to retain that element in position.

The inner sheet metal member 62 in Fig. 6 also may be provided in such region with an inwardly extending supporting flange (not shown) but similar to the flanges 35 and 46 disclosed by Fig. 2. This flange may be employed for supporting the rear surface of the bulletin board I! although such is not absolutely necessary in'view of the flanges for this purpose projecting from the sheet metal members 26 and 39.

As illustrated in Fig. 4, the side section I9 is not exactly like the side section 58 in certain constructional details because of its employment at a corner in the wall ll defining one edge of an opening 13 in which a bookcase or other fixture or furnishing element 75 is inserted. Of course the section 59 embraces substantially the same constructional elements as the section [8 although in the former they are arranged somewhat diflerently to accommodate this variation in room construction.

However, as illustrated in Fig. 4, the section l9 comprises an inner sheet member 14 having a wooden or other suitable spacing member 76 secured thereon by screws Tl projecting through the members into blocks l2 in the wall II. The outer surface of the member E6 is covered by a sheet metal member 78 which is secured to the member it by screws i9. The inner sheet metal member M is provided with a supporting flange 81 for the rear of the bulletin board I1 although, as hereinbefore indicated, such flange may be eliminated on the end section if desired. On the opposite edge thereof the inner sheet metal member is provided with an outwardly projecting flange is! which extends, in this instance, along the inner surface of an inwardly projecting flange 82 formed on one edge of the outer sheet metal member i8. Inasmuch as the outwardly projecting flange MI is not required to support the finishing coatin 29 of the room, the outer edge thereof may be cut off, as indicated at 83 in Fig. 4, or the entire inner sheet metal member 74 may be eliminated if desired, as indicated in Fig. 5. In either instance, however, a molding such as that illustrated at 84 may be employed to cover the space between the rear edge of the flange 82 and the front corner surface of the bookcase 15. The opposite edge of the front sheet metal member 18 extends outwardly over the blackboard l6 and the bulletin board I1 and is there provided with an inwardly projecting flange 86 which retains such elements in their. proper position.

While in all figures of the drawing the sections l8, l9, 2!, 22 and 23 have been indicated as secured rigidly to the wall II by employing the blocks l2, it is to be understood that the latter may be entirely eliminated simply by drilling holes in the material of the wall and employing therein toggle bolts, ordinary bolts or nails (not shown) of well known construction rather than screws and blocks as illustrated.

In assembling a building embracing a bill board and blackboard construction such as that illustrated herein, the frame sections l8, l9, 2|, 22 and 23 are secured rigidly to the supporting or main wall I i in any suitable manner but in such relation as to define a region or opening of suitable dimensions for the reception of the blackboard and bill board elements and this is done before the inside coating 29 or plastering of the room is applied. When workmen later apply such coating they simply cover the inner walls of the building therewith up to a depth equal to the height of the flanges projecting outwardly from the inner sheet metal members employed in all of the various sections but not within the region is therein. The blackboard E and the cork board ll then are placed in their respective positions; the cork board ll being merely placed against the inner supporting flanges of the inner sheet metal members of the sections of the frame, and the blackboard being placed upon the upper edge of the wooden frame member and pressed slightly against daubs of freshly mixed plastering material or cement which are placed on the wall I l before the blackboard is disposed inposition. The outer sheet metal members and the chalk trough then are secured in position by tightening their respective attaching screws and the structure thus assembled is ready for service.

It is to be understood that the blackboard and bulletin board It and i! can be employed in separate frames if desired rather than as a composite unit as illustrated.

Although, for the purpose of illustration, only a particular form of the invention has been disclosed in detail, it is to be understood that the invention is not so limited but may be embraced in numerous other structures within the spirit of the invention and the scope of the appended claims.

I claim:

1. A building construction comprising a-wall having a recess therein, a board disposed within said recess for displaying visible characters upon the front surface thereof and sheet metal frame means secured to the bottom of said recess and substantially flush with the outer surface of said wall for securing said board in a position within said recess of relatively close proximity to the plane of said outer surface.

2. A building construction comprising a plastered wall having a substantially blind recess therein, a plurality of inner frame members disposed in the bottom of said recess around the margin thereof and each coextensive with an edge of said recess, said frame members having outwardly turned edges terminating at the outer surface of said wall, a plurality of spacing mem- 5 bers secured on said frame members, said spacing members having a thickness slightly less than the depth of said recess, a board disposed within said recess'approximately flush with said outer surface for the display of visible characters thereon and a plurality of outer frame members coextensive with said inner frame members covering the edges of said board and the outer surfaces of said spacing members and being spaced from the bottom of said recess by said spacing members.

3. A board construction comprising a pair of spaced sheet metal members each having a flange in superposed contacting relation to the corresponding flange of the other member at corresponding edges thereof and each having a flange adjacent the opposite edge in spaced and parallel relation to the corresponding flange on the other member, a display board confined between said flanges and a member received between and contacting opposed faces of said sheet metal members for spacing said sheet metal members, said display board and spacing member being of relatively different thickness.

4. A blackboard frame member comprising a pair of sheet metal angle members arranged in face-to-face relation with the feet of the angles contacting and overlapped with respect to each other whereby to form an inwardly opening channel for the reception of a blackboard, the-margin of the leg of the outer angle member being reversely bent whereby to form a channel for the removable reception of hook members.

5. In a building construction comprising a plastered wall having a recess therein, a board disposed within said recess with its front face inwardly and slightly ofiset with respect tothe front face of said wall for displaying visible characters thereupon, means secured to said Wall independently of the front face thereof and substantially flush with said front face aiding in the positioning of said board and serving as a guide for the depth of plaster during construction of said wall, and means substantially flush with said wall for securing said board to said wall.

6. A building construction comprising a wall 60 having a recess therein, a board Within said recess for displaying visible characters upon the front surface thereof and a plurality of sheet metal frame members marginally embracing opposite face surfaces of said board and securing the same in position, the front surfaces of said frame members being substantially flush with the outer surface of said wall and approximately flush with the front surface of said board.

'7. A wall construction comprising a substantially imperforate inner supporting portion and an outer finishing covering of plaster of the usual thickness therefor, said finishing covering having an opening therein, a board disposed within said opening and a supporting frame secured to said supporting Wall and of substantially equal depth as compared with said finishing covering wherebythe outer face of said frame is substantially flush with the outer face of said finishing covering and the outer face of the board is approximately flush with said face of the finishing covering, said supporting frame having said board secured thereto.

8. A building construction comprising a wall having a recess therein, a board disposed within said recess for displaying visible characters upon substantially flush with the wall surface and intermediate and overlapping the adjacent edges of said boards for securing said boards relative to the wall, and other frame members flush with the wall adjacent and overlapping the remaining edges of said boards and embracing opposite face surfaces thereof for securing same relative to the wall, the one of said frame members adjacent the lower edge of said remaining edges being further formed to provide a crayon and eraser trough. m;

NIELS C. SORENSEN.

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