US1487052A - Eraser - Google Patents

Description

March- 18, 1.924.

. D. lENOMOTO ERASER Filed Sept.- 21. 1922 DANIEL nN-oivrofro, ori BERKELEY, oaLIronivA.

ERASEB: v

Applicationziiledisptrnbcl.21, 1922.?.v Serial No: 589,509?

To all whom it' 'may concern.'

Be it known that I, DANmnEN'oMo'ro;

a subject of the Emperor of Japan, residing at Berkeley, in the county of Alamedav and State of California, have invented newv and useful. lmprovementsin Erase-rs, of which the following is a specification.

The present invent-ion relates to improvements in black-board erasers andY has for kits primary object to provide a simply constructed and inexpensive eraser which will not scatter chalk-dust when in use and which will provide for a cleaner` and more effective erasing of black-boards and the like.

One of the objects of the invention is to provide an eraser in which the erasing elements are in the form of rolls subject to limited movement in order that the chalkdust will be removed during the operation of the eraser.

Another object is to provide an eraser of the character described in which the. back or frame for supporting the erasing member or members, includes a brush arranged so as to remove dust from the erasing members and to prevent scattering of the dust when the eraser is in use.

The invention possesses other advantages and features some of which, with the foregoing will be set forth at length in the following description where, I shall outline in full that form of the invention which I have selected for illustration in the drawing accompanying and forming a part of the present specification. In said drawing I have shown one form of the construction of my invention, but it is to be understood that I do not limit myself to such form since the invention as expressed in the claims may be embodied in a plurality of forms.

Referring to the drawing:

Fig. 1 representsa bottom plan view of the eraser constructed in accordance with the invention7 part thereof being broken away and shown in Vsection for the sake of clearness of illustration.

Fig. 2 represents a longitudinal sectional view taken through the eraser, showing one of the eraser rolls in elevation and showing part of a black-board in section.

Fig. 3 represents a cross sectional view through the eraser.

Fig. 4 represents an end view of the eraser.

Referring to the embodiment of the invention illustrated in the accompanying drawing, 1 designates a frame or back member of they eraser of my invention, whicli member or frame is constructed of woody or some other suitable materialand is providedy with two longitudinal recesses-or groovesy 3 and 4, spaced apart by a web portion 5 and closed-at their ends by wallsV (i.

Mounted for rotation withinrv the grooves,`

are cylindrical yeraserrolls 7 and 8, having trunnions 9 at oppositeends` thereof, which trunnions are journaled in the end walls 6; The rolls 7 and 8 are of anysuitable construction and preferably provided with cloth felt or other similar suitable erasing surface. Each roll is spaced circumferentially from the groove or recess in the body member and` projects outwardly from one side or face of the body member so that it may be brought into contact with thel black-boardas at A, shown in Fig. 2. A plurality of brush bristles 10 are, in any suitable manner, mounted within the recesses 3 and 4 and arranged to contact with the rollers 7 and 8, said bristles being arranged to provide substantially semi-circular brushes as particularly shown in Fig. 3. Extending from opposite longitudinal edges of the body member are flanges or strips 11, which project laterally and inwardly and are slightly spaced from the peripheries of the rolls. These strips 11 and 12 constitute guard members to prevent dust brushed off of the rollers from being scattered when the eraser is in use.

To limit the turning of the rolls, the rolls are provided with stop pins 13 at their ends, said pins being adapted to engage with similar stop members 14 and 15 at the ends of the recesses. The pins are so arranged that the rolls willbe permitted to make one-k half turn in either direction for a purpose to be later more fully described.

At the ends of the recesses 3 and 4 in thel walls 6, there are provided doors 16, by means of which the chalk-dust collecting within the recesses may be removed from time to time.

To operate the eraser, when the pins 13 are engaged with the pins'14, as shown in' Fig. 4, the eraser may be moved from left to right across the blackeboard and the rolls will be prevented from turning, due to such.

to left, the rolls Wil rotate one-half turn each and the pins 13 Will strike the pins 15 and thereby limit the rotation of the rolls. On its return movement, When the rolls are turned, the parts of the rolls which have been used to erase the black-board on the first stroke of the eraser, are moved into the receses 3 and 4 and since the rolls are in contact With the brushes, these surfaces Will be brushed and the chalk-dust-removed therefrom. Simultaneously With the brushing of the previously used portions of the rolls, fresh portions of the eraser rolls will be brought into an erasing position. It Will thus be seen that upon reciprocation of the eraser upon the surface to be erased, the rolls Will be alternately moved so as to present clean or fresh portions thereof, upon each stroke and that the dust brushed from the rolls Will not be scattered since the brushing` takes place Within the recesses 3 and at. In this Way the eraser rolls are kept clean and an eliective erasing of the black-board is insured.

I claim:

l. An eraser comprising a body member having a recess therein, a cylindrical erasing member rotatable in the recess and a brush Within the recess having its bristles contact ing With the periphery of said erasing member. Y

2. An eraser comprising a body member, an eraser roll rotatable in the body member, means for limiting movement of said roll and means acting only When said eraser roll is rotated for brushing said roll to remove the chalk therefrom.

DANIEL ENOMOTO.

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