US336612A

US336612A - Slate-cleaner

Info

Publication number: US336612A
Authority: US
Publication date: 1886-02-23
Anticipated expiration: 1903-02-23

Description

(No Model.)

1?. WITTRAM.

SLATE CLEANER.

No. 336,612. Patented Feb. 23, 1886.

T. QWN M InUE mu 1'."

UNITED STATES PATENT OFFICE.

FREDERICK \VITTRAM, OF SAN FRANCISCO, CALIFORNIA.

SLATE-CLEANER.

.JPECIPICATION forming part of Letters Patent No. 336,612, dated February 23, 1886.

Application filed November 11, 1885. Serial No. 183,517. (No model.)

To all whom it may concern.-

Be it known that I, FREDERICK \VITTRAM, a citizen of the United States, residing in the city and county of San Francisco, State of California, have invented a new and useful Improvement in Slate-Cleaners; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings.

My invention relates to devices for removing pencil-marks from slates to produce a clean surface for repeated use; and it consists in the construction and combination of water-reservoir, wet rubber, and dry rubber or eraser, substantially as hereinafter described and set forth.

The body of this device is a flattened tube open at both ends and capable of holding water. Into one end is fitted a soft porous plug or piece of material having suflicient porosity to permit the passage of water through it when pressed against and drawn over the slate-surface. The other end of the tube is closed by a stopper of harder material, impervious to water, and of such character that its projecting end serves for wiping out or effacing the marks after the wetting process, and also for drying the slate.

Referring to the accompanying drawings by figures and letters, Figure l is an outside view, and Fig. 2 a cross-section taken longitudinally through the device.

A is the body, which is formed of a flat tened tube, preferably of tin or other suitable kind of metal. B is the porous rubber, and G the non-porous block that forms both a stopper and an eraser and drier. The tube is made somewhat flaring to give a wider opcxr ing for the rubber I), and the edges of the nar row end are turned over or headed. The rubber B may be a piece of line spongeor a piece of felt, and it should be tightly pressed into the tube and secured by turning in the edges of the opening or otherwise upsetting the metal. It should also extend into the tube a considerable way. The part 0, at the opposite end, should be made of vulcanized rubber, and should be forced into the tube so as to close its end, and be securely held by its own expansion, suiiicient projection being afforded beyond the tube to permit the block to be withdrawn for filling the tube with water, and for furnishing a dry rubbing edge or end to be drawn over the slate without bringing the edge of the metal in contact with the slate'surface.

Instead of having the piece C removable, it could be permanently fixed in the tube; and to supply the device with water a filling-aperture provided with a stopper could be made in the side of the tube.

- When intended to be carried in the pocket, the moist end B may be covered by a cap pro vided for the purpose.

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is

The herein-described device, consist-ingot the waterholding tube A, the porous rubber B in one end, and the nonporous rubber O in the other end, the former constituting a moist rubber, and the latter serving for a harder drying rubber and eraser, substantially as set forth.

FREDERICK \VITTR-AM.