US2300248A - Frame for blackboards - Google Patents

Description

0d 27, 1942 A. A ELNETT FRAME FOR BLAcKBoARDs Filed. Dec. 9, 1940 www B /Q/LQQQ ATTORNEY I Patented Oct. 27, 1942 ortica-1 11 Claims.

This invention relates to frames in general and more especially to metal frames suitable for supporting blackboards and the contrivances today customarily associated with blackboards.

Among the objects of the present invention it is aimed to provide an improved metal frame forv supporting blackboards and the like including a main frame portion, a metal finishing trim, chalk frames and metal clips for removably connecting the trini, chalk frames and the like to the main frame portion.

These and other features, cap-abilities and advantages of the invention will appear from the sub-joined detail description thereof illustrated in the accompanying drawing, in which Figure l is a front elevation on a reduced scale of a frame equipped with a cork board and blackboard.

Fig. 2 is a section enlarged on the line 2-2 of Fig. l.

Fig. 3 is an enlarged fragmental view of one corner of the frame equipped according to the present invention.

Fig. 4 is an enlarged section on the line 4 4 of Fig. 1, and

Fig. 5 is a fragmental enlarge-d perspective of a portion of the main strip and clip detached.

In the embodiment shown there is illustrated a main wall W, which may be brick as an instance,

to which are secured the metal strips of the main frame elements I, 2, 3, l and 5, the metal strips of which, in cross-section, are substantially identical with one another, see as an instance the fragmental strip 6, which consists essentially of two parallel base. webs 'l and a main outer web 9, and intermediate webs connecting the outer web 9 with the base webs and 8, said intermediate webs including the intermediate. web Il, preferably extending vertically to the webs 9 and 'I and Connecting the web 9 with the web l, and also including the stepped web portion I I consisting of two short web portions I2 and I3 parallel to the web II and a connecting web lli between the web portions I2 and I3, such connecting web Id extending parallel to the webs 7, 8 and 9. On

the base web 'I at intervals, as desired, there are provided the spring blades I5, known in the trade as double end springs each consisting of a bowed portion I6 and a securing flange I'I, which latter flange is secured to the outer face of the base web by a rivet i 8, or the like, while the free end of each blade I5 rides on the adjacent base web 'I.

In addition to the spring blades I5 each strip 6 is also provided with a plurality of spaced apart 55 fastening clips I9 having the slots 20 cooperating with the screws 2|,A which are screw threadedly connected to the openings 22 in the web 9. The clips I9 preferably consist of a main web 23 in which the slots 20 are formed, which extend parallel tol the web 9*, an outwardly flaring web portion 24 along one end of the web 23 and a hooked web portion 2.5 along the other end of the web 23 (see Figure 5), the hooked web portion 25 slightly flaring from the intermediate web portion 23. The clips I9 and strips B are preferably composed of steel.

When installed and attached to a wall, the webs I@ of theY strips 6 face one another for the blackboard 2B', and the stepped webs II of the strips ItV and ll face one another for forming the cork board 27. When the cord board 2l constitutes a panel above the blackboard 26, as illustrated in Figs. 1 and 2, the metal strips of the frame elements I and 2 are supplemented between the frame elements 3 and 4 by strips 6 in which the stepped webs II also face one another to cooperate with the. stepped webs II of the frame elements 3 and 4 to support the cork board 21.

As shown in Fig. 2, the strips 5 are secured to the main wall W by having screws 28 extend through the base webs l and 8 and also the screws. I8 of the springs I5 extend through the base. webs 'I into the wall W. Metal strips of the frame elements I, 2, li and 5 are arranged as aforesaid by having the webs Ill face one another, thereupon the blackboard 25 which may vary in thickness is placed against'the bowed portions Iii of the springs I5 between the opposing webs It), thereupon the clips I9 move inward over the edges of the blackboard 26 and the screws 2o are tightened, as shown in Figure 2.

The metal strip of the frame element 3, as aforesaid, and the metal strips of the frame elements 2B and 3E) supplementing the metal strips of the frame elements I and 2 are similarly secured to the wall W by having screws 28 pass through the webs I and 8 and the screws I3 of the springs I5 pass through the webs I into the wall W, with the stepped webs II facing one another, rlrst preferably to receive a plaster ller 3i in the space between the webs I3 and then to receive the cork board 27 on the sides formed by the webs I2 and |4 as shown in Figure 2.

If the blackboard 26 has already been installed then care must be exercised to see that the cork board 21 clears the hooked webs 25 of the clips I9 secured to the strip 4. Thereupon the clips I9 of the metal strips 6 of the supplemental frame secured fiat against said base web and strip elements 23 and 30 and of the frame element 3 are moved over the edges of the cork board 21 and secured in place by tightening the screws 2 I.

Thereupon, there are secured to the metal strips of the frame elements I, 2, 29, 30 and 3, the finishing trim strips 32 (see Figs. 2 and 4) which are preferably composed of aluminum and consist essentially of a main plate element 33 and two winged portions 34,135 extended vertically to the plate element 33 land two inwardly extending ngers 3S and 31 formed on the wing portions 34 and 35, respectively, the fingers 36 and 31 being either slidably mounted on the clips I9 mounted on metal strips 6 of the frame elements I, 2, 23,

30 and 4 or forced thereon, advantage being taken of the transverse yieldability of the strips 32.

To the clips I3 secured to th'e metal strip of the i lower frame element 5, there is secured the chalk frame or shelf strip 38, see Figures 2 and 3, consisting essentially of a recessed or trough formed upper web 39, and an inclined lower web 40 with an inwardly extending finger 4I at the inner edge of the trough formed web 39 and another inwardly extending finger 42 at the inner edge of the inclined web 40. This strip 38 similarly is either slidably mounted on the clips I9 on the metal strips 6 of the frame element 5 or are spring pressed into place, advantage being taken of the resiliency in the strip 38, it also being preferably composed of aluminum.

In place of the plain trim strip 32, see Fig. 2, the clips I3 or the metal strips 6 of the upper frame 3 may consist of a trim strip 42 similar to the strip 32 and having extended therefrom the map receiving molding 43 consisting essentially of the elongated projection 44 and two wing elements 45 and 45 extending parallel to the main plate 41 of the strip 42. To this molding 43 picture hanging hooks 48 for securing the cords of maps or the like are connected, the hooks 48 consisting of wire or metal elements having two opposite U-shaped fingers 49 and 50 and a cord receiving hook element I, which hooks 48 may be slidably moved onto the wings 45 and 46 of the molding 43 as shown in dotted lines in Figure 2.

As shown in Figure 2, ab-ove the web I5 of the metal strips 6 of the frame element 3 and below the stepped web II of the metal strip 6 of the frame element 5, the plaster layers or fillers 52 and 53 are disposed. Plaster illers or layers like the layers 52 and 53 are also disposed on the wall W laterally of the outwardly extending webs of the metalstrips 6 of the frame elements I, 2, 29 and 30.

It is obvious that various changes and modifications may be made to the details of construction without departing from the general spirit of the invention as set forth in the appended claims.

I claim:

1. A frame for a blackboard or the like including a metal strip enclosure in cross-section a base web, an outer offset web parallel to said base web, an intermediate web connecting said base web to said offset web, a plurality of clips secured to the outer face of said offset web, a plurality of fiat double end springs secured to the base web, and means for drawing said clips toward said springs resiliently to grip the edge of a blackboard between said slips and said springs, the flat springs having an outer bowed portion to engage the blackboard, one end portion being the other end portion free to ride on said base web according to the thickness of the blackboard portion being engaged by the associated bowed portion and the consequent tension exercised on such blackboard portion.

2. A frame for a blackboard including a metal strip enclosure in cross-section a base web, an outer offset web parallel to said base web, an intermediate web connecting said base web to said offset web, a plurality of clips secured to the outer face of said oifset web with a portion thereof extending beyond said offset web and spaced from said base web to receive an edge of the blackboard therebetween, a plurality of flat double end springs, one for each of said slips secured tosaidbase web, and means for drawing said clips. toward said springs, resiliently to clip the edge of the blackboard between said clips and said springs, the iiat springs having an outer bowed portion to engage the blackboard, one end portion being secured flat against said base web and the other end portion free to ride on said base web according to the thickness of the blackboard portion being engaged by the associated bowed portion and the consequent tension exercised on such blackboard portion.

3. A frame for a blackboard including a metal strip enclosure in cross-section a base web, an outer offset web parallel to said base web, an intermediate web connecting said base web to said offset web, a plurality of sets of clips and springs, each set including one clip and one spring, the clips being positioned on the outer face of said offset web and the springs being secured on the outer face of said base web adjacent to but spaced from a portion of its associated clip, the springs including a flat outwardly bowed portion and having one end secured flat against said base web and the other end free to ride on said base web according to the thickness of the blackboard portion engaged and the consequent tension exercised on the bowed portion, and means for drawing said clips toward said springs, resiliently to grip the edge of the blackboard between said slips and said springs.

4. A frame for a blackboard including a metal strip enclosure in cross-section a base web, an outer offset web parallel to said base web, an intermediate web connecting said base web to said offset web, a plurality of sets of clips and springs, each set including one clip and one spring, the clips being positioned on the outer face of said loffset web and the springs being secured on the outer face of said base web adjacent to but spaced from a portion of its associated clip, the springs including a fiat outwardly bowed portion and having one end secured ilat against said base web and the other end free to ride on said base web according to the thickness of the blackboard portion engaged and the consequent tension exercised on the bowed portion, means for drawing said clips toward said springs, resiliently to grip the edge of the blackboard between said clips and said springs and trim and chalk shelf strips having offset gripping edges for engaging the edges of said clips after having been secured in place to anchor the blackboard in position.

5. A frame for a corkboard or the like includ-v ing a metal strip enclosure in cross-section a base web, an outer offset web parallel to said base web, an intermediate stepped web connecting said base web to said outer offset web including an intermediate oiset web parallel to said outer oifset web, said intermediate offset web'parallel' to said o'uter offset web serving as a -guide to facilitate accurately predetermining the level of therplaster behind the cork board, clips disposed on the outer fa'ce of said outer offset web and having a portionvthereof extending beyond. said outer oifset web adjacent to but spaced from said intermediate -oset web to receive therebetween the edge of a corkboard and means for drawing said clips down securely to grip the edge of the corkboard between said clips and said intermediate oifset web and the plaster behind the cork board.

6. A frame for a plurality of boards such as blackboards, corkboards and the like including metal strip enclosures in cross-section oppositely extending base webs, an outwardly offset web parallel to and intermediate said base webs, an intermediate transverse web connecting one side of said odset web with one of said base webs and extending perpendicularly to said offset base webs, a second intermediate transverse web connecting the other side of said offset web with the other of said base webs and including an intermediate offset web parallel to said outer offset web, a plurality of clips secured to the outer face of said oifset web with portions thereof extending beyond both' sides of the outer oifset web, a plurality of at double end springs, each mounted adjacent one of said clips on that base web which is disposed adjacent said intermediate vertically extending transverse web, and securing means for drawing said clips downwardly to grip an edge of a blackboard between said springs and the overhanging portions on one side of said clips and to grip an edge of a corkboard between said intermediate offset web and the overhanging portions on the other side of said clips, said intermediate web pci tion parallel to said outer offset web portion when used for the cork board serving as a guide to facilitate accurately predetermining the level of the plaster behind the cork board.

7. A frame for a plurality of boards such as blackboards, corkboards, and the like including metal strip enclosures in cross-section oppositely extending base webs, an outer offset web parallel to and intermediate said base webs, an intermediate transverse web connecting one side of said offset web with one of said base webs and extending perpendicularly to said offset base webs, a second intermediate transverse web connecting the other side of said offset web with the other of said base webs and including an intermediate oiiset web parallel to said outer oifset web, a plurality of clips secured to the outer face of said offset web with portions thereof extending beyond both sides of the outer oifset web, a plurality of flat double end springs, each mounted adjacent one of said clips on that base web which is disposed adjacent said intermediate vertically extended transverse web, and adjustable securing means including a slot in each clip and a screw extending through said slot into said outer offset web for drawing said clip downwardly to grip an edge of a blackboard between said springs and overhanging portions on one side of said clips and to grip an edge of a corkboard between said intermediate offset web and the overhanging portions on the other side of said clips, said intermediate web portion parallel to said outeroffset web portion when used for the cork board serving as a guide to facilitate accurately predetermining the level of the plaster behind the cork board, said slot facilitating adjustment of said clip relative be-secured in place. I

2'8. A frame for a blackboard including. a metal strip enclosure in crossesection a base web, kani outer-,offset web parallel to said base web, an!

intermediate web. connecting saidfbase web to said offset web., a plurality of vclips secured tothe outer face of said offsetweb with a portion `thereof? extending beyond said offset web but spaced from said base web to'receivean edge of the blackboard therebetween, .l a plurality of :flat double endsprings, onef'for each of'said clips secured to said base web, and adjustable securing means including a slot in each clip and a screw extending through such slot into said outer offset web for drawing the clip downwardly to grip the edge of the blackboard between said clip and its associated spring.

9. A frame for a corkboard or th'e like including a metal stripvenclosure in cross-section a base weban outer oifset web parallel to said base web, an intermediate stepped web connecting said base web to said outer oifset web including an intermediate offset web parallel to said outer offset web, said intermediate oiset web parallel to said outer offset web serving as a guide to facilitate accurately predetermining the level of the plaster behind the cork board, clips disposed on the outer face of said outer oset web and having a portion thereof extending beyond said outer offset web adjacent to but spaced from said intermediate oifset web to receive therebetween the edge of a corkboard, means for drawing said clips down securely to grip the edge of the corkbo'ard between said clips and said intermediate offset web and adjustable securing means including a slot in each clip and a screw extending through such slot into the outer olfset web andfor drawing the clip downwardly to grip the edge of the corkboard between said clip and an intermediatev web, clips disposed on the outer face of said outer offset web and having a portion thereof extending beyond said outer offset web adjacent to but spaced from said intermediate offset web to receive therebetween the edge of a corkboard, means for drawing said clips down securely to clip the edge of the corkboard between said clips and said intermediate offset web and the space between the corkboard and the building wall being lledwith plaster or the like, said intermediate oifset web parallel to saidvouter offset web serving as a guide to lfacilitate accurately predetermining the level of the plaster ller between the building wall and the cork board.

1l. A frame for a plurality of boards such as blackboards, corkboards, and the like including tothe edgesv ofthe blackboard and corkboard to oset web with portions thereof extending beyond both sides of the outer offset web, a plurality of at double end springs, each mounted adjacent one of said clips on that base web which is dis- Web portion parallel to said outer offset web portion when -used for the cork board serving as a guide to facilitate accurately predeterminlng the level of the plaster behind the cork board, the

space surrounding the frame beyond the building wall being lled with the usual plaster or the like,i

the outer offset web parallel to and intermediate said base Webs serving as a guide to facilitate accurately predetermim'ng the level of the plaster for the building Wall in the space surrounding the frame,

ANTHONY A. ELNE'IT.

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