US1589597A

US1589597A - Eraser holder

Info

Publication number: US1589597A
Application number: US59128A
Authority: US
Inventors: Joseph P Kennedy
Original assignee: Individual
Current assignee: Individual
Priority date: 1925-09-28
Filing date: 1925-09-28
Publication date: 1926-06-22
Anticipated expiration: 1943-06-22

Description

June 22 1926.- 1,589,597

J. P. KENNEDY ERASER HOLDER Filed Sept. 28, 1925 Patented June 22, 1926.

rn'raNT ortica.

JOSEPH I. KENNEDY, OF CHICAGO, ILLINOIS.

ERASER HOLDER.

Application filed September My invention relates to a holder for blackeboard erasers and has for its object totprovide a device for this purpose which will be strong, durable and cheap to manufacture and which, while taking a firm grip on the black-board structure, preferably on the chalk-rail of the blackboard, )reventing accidental displacement, will be capable of-being readily removed therefrom, if need be, for cleaningthe chalk-rail, fory example.

p A further object is to provide a device so constructed as to be sightly in appearance.

The invention is illustrated in the accompanyingy drawing, in which Fig. 1 is a View in perspective of the eraser holder shown as applied to the chalkrail of a black-board of common construction. i i

Fig. 2 is ac sectional viewon line 2-2 of Fig. 1.

Fig 3' is a vvifew similar to Fig. 2 but showing the eraser receiving member as it is. about to be attached to the chalk rail, and

Fig. 4 is a View of the retaining member, separately, andas seen from the inner side of said member, that is the side which is toward the black-board when the device is in position on the chalk-rail. f

i Referring tothe drawing, the blackboard structurerisl shown as consisting of a blackboard 10 having a strip or bead 11 at its lower ledge to which isfastened the chalkrail 12. f

In accordance with my` invention the eraser is held on the chalk rail by means of a retaining member 13, composed of sheet metal of some resiliency, preferably, and consisting, in the form ofthe invention shown `in the drawing, of afront plate 14, end projections land a pair of attaching

wings

16,16 which extendback of the front plate,that is between the front plate and the forward edge of the challerail, preferablyfromthe end edges ofthe front plate.

" These arrangements might be modified but are deemed particularlyssuitable for carrying out one of theprinciples of the invention, namely the provision of an eraser holderl attachable to chalk-rails of `differing cross-sectional configurations.

The

wings

16, 16 are formed with-slots 17, preferably tapering, land terminating in circular enlargements 18. i'

A'lheseslotted wings are adaptedl toen gage with attaching `elements designed to be permanently fixed to the forward edge 2s, 1925. serial No. 59,128.

ence to round headed screws in order to ob-` tain a holding pressure, to the maximum extent, as between the retaining member and the black-board structure, resisting aeci-` i dental displacement of the retainingmember while Permitting it, nevertheless, to be removed when necessary.

This holding pressure may be developed,

through strain of the retaining member, in various ways.

Preferably, the wing 1G is bent toward the front plate 14, that is in the direction from the bend toward the inner end of the wing, while the wing 16 is given a slight bend outwardly. The retaining member is put over the heads of screws 19, with the heads extending through the enlargements 18 of slots `17, and is then moved to the left (Fig. 3). The wings are thus wedged against the bevels of the screw heads resulting in a frictional grip,-due to the taper of slots 17, a straightening or flattening outof thewings against the edge of the chalkrail, produced by the beveling of the screw n heads and, preferably, also, the development of a pressure between the front plate and the flat outer surfaces of the screw heads. The

strain taking place in the relatively stiff, but 4 slightly resilient retaining member, brings about a bind of the member against the chalk-rail which resists without preventing the detachment of the member from the chalk-rail, which, nevertheless, is readily accomplished by a sharp blow on the left hand end of said member. f

It will be understood that this spring grip engagement as between the retaining member and the black-board structure might be accomplished" by expedients somewhat different from those just described. For example, it is not essential that the screw heads should project far enough from the chalkmail to bear against the front plate,7

although this is desirable in order to increase the holding grip.

It will be observed thatthe screws are completely covered by the retaining member which adds to the appearance of the device i.

and diminishes the likelihood'. that it Will be taken off by some inquisitive child. The strength of the grip is sufficient to deter any* one from attempting tol remove the holder from the black-board without knowing' just how such removal is to be accomplished.

One important feature of the device is that it can be applied; to a chalk-rail of al*- most any cross-sectional configuration.

Other advantages, which will be apparent, are the low cost of manufacture and the ease with which the device may be applied to and removed from the black-board structure. Realizing the possibility of modification within the principles of my invention, I desire t'o cover the invention in allt embodiments within the scope ofthe appended claims.

claim:

l. A black-board eraser holding device comprising in combination with fastening elements permanently fixed to the blackboard structure, a sheet metal' retaining member con'iprising a front plate and inturned'. wings adapted to intervene between the front plate and the black board structure which are slotted so as to be engageable with said fasteningelements.

2. A black-board eraser holding device comprising in combination with fastening elements permanently fixed to the blackboard structure, a sheet metal retaining` member comprising a front plate and int'nrned` wings, at oppositey ends of said member, adapted to intervene between the front plate and the black board structure which are slotted soas to be engageable with said fastening elements.l p

3. A black-board eraser holding device comprising in vcombination with fastening elements permanently fixed to the blackboard'A structure, a sheet metal retaining member comprising a front plate and inturned resilient wings adapted to intervene between the front plate and the black board structure which are slotted for engagement with said fastening element adapted to bear with spring pressure against the black-board structure.

at. A black-board eraser holding device comprising in combination with fastening elements permanently fixed to the blacle hoard structure, a sheet metal retaining men'iher having inturned wings slotted for engagement with saidl fastening elements and bent slightly so as to be adapted to be ilattened out against the black-board structure when the retaining member is attache-d' thereto to create a holding pressure.

A' black-board eraser holding device comprising in combination with fastenin elements permanently fixed to the blackhoardI structure, a sheet metal retaining member having int'urned Wings slotted for engagement with said fastening elements and bent out of parallelism with the body of said member formed so that a pressure is created between the main portion of the retaining member and the outer surfaces of the fastening elements.

6i A black-board eraser holding device comprising in combination with fastening elements permanently fixed to the blackboard structure, having undercut beveled heads. an eraser retaining member of spring metal having wings extending` between the body of the retaining member and the blackboard structure slotted to engage said fase tening elements and bent out `of parallelism with the body of said member formed so that the retaining member is strained in application to the black-board structure to develop a pressure tending to resist detach? ment therefrom.

7. A black-board eraser holding device for attachment to the chalk-rail of a blackboard comprising in combination With fastening elements permanently fixed to the outer edge ofthe chalk-rail and having undercut beveled heads, a spring metal eraser retaining member composed of a front plate, end projections extending over the chalkrail toward the black-board and inturned wings at opposite ends of the front plate slotted to engage said attaching elements.

8. A blacleboard eraser holding device for attachment to the chalk-rail of a blackboard comprising in combination with fastening elements permanently fixed to the outer edge of the chalk-rail and having undercut beveled heads, a vmetal eraser retaining member composed of a front plate, end projections extending over the chalk-rail toward the black-board and resilient inturned wings at opposite ends of the front plate slotted to engage said attaching elements and adapted to bear against. the chalkrail with spring pressure.

9. A black-boardy eraser holding device comprising in combination with attaching means permanently fixed to the black-board structure, aI metal eraser-retaining member comprising a plate covering the attaching meansand resilient portions strained by application to the black-board structure so that the device is held in place by spring pressure.

10. A black-board eraser holding device for attachment to the chalk-rail of a blackboard comprising in combination with beveled liat headed screws fixed to' the outer edge: of the chalk-rail, a spring-metal eraser retaining member composed of a front plate, end projections extending therefrom toward the black-board and inturned Wings at opposite ends of thefront plate, one of said wings being convergent with the front plate and the other of said Wings divergent from the front plate and both provided with beveled slots terminating in enlargements whereby the Wings may be engaged with said screws.

11. A black-board eraser holding device for attachment to the chalk-rail of a blackboard comprising in combination with beveled flat headed screws fixed to the outer edge of the chalk-rail, a spring-metal eraser retaining member composed of' a front plate, end projections extending therefrom toward the black-board and intnrned Wings at opposite ends of the front plate, one of said Wings being convergent with the front plate and thel other of said Wings divergent fromy the front plate and both provided with beveled slots terminating in enlargements whereby the Wings may be engaged with said screws, said screws projecting from the edgeI of the chalk-rail far enough so that with the device in place on the chalk rail, the front plate of the retaining member bears with some pressure against the outer surfaces of the screw heads.

JOSEPH P. KENNEDY.