US522469A - Jasper d - Google Patents

Description

(Ne Medel.) l A J.D. KIOUS.

BLAGKBOARD BRASER. Ne. 522,469. Petented July s, 189e.l

, 7, E Inventor.

C Attorney.

' same in the accompanying drawings,formingv `To a/ZZ whom it may concern,.- L

UNITED-STATES ATENT Enron. v

JASPER D. KIoUs, QEMQMENCE, immers, AssIGNoR, BY DIRECT AND MEsNE A ssIGNMENTsg'To LUDENT'IArHRooR--or SAME PLACE.

sPEcIFI'cAT'IoN refining part ofpI-.ete'rs Patent' N. 52e,4e9,'datea Julye, 1894.1

` Application nea Math 's,f18,94. staunt.' 502,205. manada) v Be it known um I, JASPER D. mous, a. our

zen of the United States, residing at Mornence,

in the county of Kankakee and State o'f'Illi-4 nois, have invented certain new and useful Improvements in Blackboard-Erasers; and I do hereby declare the following to be afull,

clear, and exact description of the invention,I

such as will enableothers skilled .in the art to which itappertains to make and use the same."

Theobjectsof this improvement are to 'produce kan eraser` which will ,thoroughly-.efface alljchalk-vmarks from the 4surface of a blackboard and alsoI prevent the4 dust kfrom dying or dispersing over the user thereof andr into the room or apartment.y To the'accomplishment' of these desirable ends,-I construct my eraser with a rubbing surface composed of independent, closely-adjacent,[pliable strips arranged to leave yintermediate spaces'zloe:v

tween themselves `for the passage of thechalkdust into the body or back 'of :the eraser;l and.

this body isma'de'witha solidback and with;

longitudinal chambers which are designed to receive the chalk-dust asitis effaced bythe" pliable stripsfwhereb'y lthe dustfwhen it is cleaned off ythe blackboard surfacepwill not adhere to the strips lbuttpasses betweenthem` into the longitudinal chambers and the 'eraser'A can be easily freed from. the'accumulations of dust in its chambers byfknocking one end of the eraser against a wall, desk, or other' surLV face.

Myimprovement further consists in the construction and organization of devices forming an improved blackboard eraser which will be hereinafter more fully described and pointed out in the claims.

To enable others Vto more :readily understand my invention, I have illustrated the a part of this specification, and in which- Figure l is a perspective'view of my 4eraser.,V

Fig. 2 is a' transverse sectional view on the line a: a: of Fig. 3, and Fig. 3 is a longitudinal sectional view on the line y y of Fig. 2. Fig.

,4 is a perspective view of another embodiment cility of manufacturing the article.

TheibodyAvof vmy improved blackboard eraserV is 'preferablymade orc'ut from a single piecefof wood'of appropriate size and shape, but the particular shape, size and substance are not`mate`rial, although I prefer Wood on Yaccount'of y'its cheapness and the fa- Thron gh the body, A, are formed or produced a series of parallel chambers, B,"Which extend longitudingallythroughV the body and opeu'thqugh'.

the ends'thereof 'for the 4purpose roffr'eadily although' this is not essential ,and these cham'. f bers are divided or separated fromeach other by theinterveningwalls'or partitions, b.

The back, C, of the body is in one solid unbroken or continuous piece; to prevent the chalk-dust in the chambers B, from escaping over the hands and person of the operator; but the othersurface ofthe body to which are -appliedthe pliable strips,'presently described,

is broken by the channels D, which are formed :by andbetween the walls or partitions, b, and

through orby'which channels the chalk-dust is conducted fr'o'mthe cleaning surface of the eraser to the' chambers, 1B. These chambers areofigreater diameter or widthltha'n the channels,:.D,^an'd the chambers maybe-of any desired form'in cross section,'either round'as ,knocking out and removingthe chalk-dust,

shown by Fig. 2 ofV the drawings, 'or triangui lar asshownwby Fig, or'anyfother desired form which /experience'may'dictate or the demandsof the users and trade may require.

E designates the' series'of parallel pliable strips which .are preferably made of a suitn able kindV of felt," and F are other pliable strips of leather or rubber fabric. The felt strips, E, are affixed or secured, by cementling or other suitable manner, to the outer edges of the VWalls' or partitions, b, and between' the channels, D g" and said pliable strips are of such Width or thickness as to form a 'proper rubbing surface to the eraser and alsoV afford each'strip a certain independent play o r actionto enable it to properly v'perform 'its function of cleaning the surface of the blackboard and to provide for thepassage of the chalk-dust between the strips of felt, into the adjacent channel, D, and to the chamber, B, in communication with the channel, as will be readily'understood.

The pliable strips, F, of leather or rubber fabric, are of such width or so secured to the body A as to have their free edges project slightly beyond the outer free edges of the felt strips, and I have found that this construction operates to clean and efface the chalk-marks more thoroughly from the blackboard. However, I do not strictly limit my self to the use of these strips, F, and in Figs. 4 and 5 I have shown an eraser in which said strips, F, are omitted altogether. In the eraser shown by Figs. 1, 2 and 3, of the drawings, which is the preferred embodiment of my invention, these strips F alternate with the felt strips E, and a continuous strip, F', is provided around the sides and ends of the body A.

My improved eraser is used in the same manner as other blackboard erasers are used by those familiar with these devices, but unlike such prior devices which permit the rubbing surface to absorb the chalk-dust and hence in a short time becomes so filled or charged therewith as to disperse the dust over the person and room, besides rendering it diilicult to clean olf the accumulated dust, my improvement Wholly obviates the dispersion of the dust over the room and person because the dust as it is cleaned olf the blackboard does not become absorbed by the pliable strips E, F, but passes between them, into the channels, D, and thence tothe chambers B. As the operator grasps the solid sides of the body A, the hands are not soiled by the chalk-dust, and the eraser can be easily freed or cleaned from the dust by striking one end thereof against a Wall so that the dust in the chambers B will pass out at the ends thereof.

In the practical construction of my improved eraser, I prefer to close the ends of the dust-receiving chambers in the body in order to retain the dust within the chambers and prevent school-children from blowing it over one another. The ends of the chambers may be closedin any desired way, as for instance by strips or heads, fastened or secured to the body by any preferred means, as will be readily understood.

I-Iaving th-us fully described my invention, what I claim as new, and desire to secure by 5o Letters Patent, is

l. An eraser comprising a body having the longitudinal chalk-receiving chamber, and a rubbing surface composed of felt and leather or rubber strips arranged parallel to each other, and said leather or rubber strips projecting slightlyv beyond the edges of the felt strips, substantially as and for the purposes described.

2. In an eraser, the body A having the solid 6o back, the channels D, and the longitudinal dust chambers B of increased size as compared to the width of the channels, combined with the spaced, pliable, rubbing strips secured at their inner edges to the body between the channels therein, as and for. the purposes described.

3. In an eraser, substantially such as herein shown and described, a body A provided with the series of internal longitudinal chambers 7o B and a like series of channels D which extend from the chambers B and open through one face of the body, the width of the chambers being greater than that of the channels, combined with the series of parallel spaced rubbing-strips E Secured at their inner edges to the body between the channels D, whereby spaces are provided between the series of rubbing strips for the chalk dust to pass into the channels D and thence to the enlarged 8o dust chambers B, as set forth.

In testimony whereof I aiiix my signature in presence of two witnesses.

JASPER D. KIOUS.

Witnesses:

FRANK C. BROWN, WILLIAM C. CALKINs.

Images