US365356A - Jerome travis - Google Patents

Description

(No Model.)

J. TRAVIS. BLAGKBQARD BRASIER. No. 365,356. Patented June 21, 1887.

w/ L M5555. I D l- UNITED STATESr PATENT @Ii Fries.

JEROME TRAVIS, OF CLINTON, MICHIGAN, ASSIGNOR OF ONE-HALF TO BRADLY G. SWIFT, OF SAME PLACE.

BLACKBOARD ERASER.

SPECIFICATION forming part of Letters Patent No. 365,226, dated June 21, 1887.

Application filed April 80, 1887.

To all whom it may concern.-

Be it known that l, JEROME TRAVIS, a citizen of the United States, residing at Clinton, in the county of Lenawee and State of Michigan, have invented certain new and useful Improvements in Blackboard-Erasers; and-I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same,refer ence being had to the accompanying drawings, which form part of this specification.

My invention relates to that class of devices commonly known as blackboard-erasers, and has for its object to provide an eraser with a strip of erasing material that canl be so adjusted and turned when any particular portion of it becomes worn out as to bring 'a fresh supply into use, and thereby enable the eraser to be used until all the erasing material is eX hausted, when a new strip can be substitutedand the device made to operate as well as when new 5 and it consists in the construction hereinafter described, and more particularly pointed out in the claims.

Heretoforein the construction of blackboard-erasers it has been common to permanently secure the erasing material to a block by` means of glue or other adhesive material, or to s'o secure the material on the block by other means in such a way that it cannot be changed from its Original position. In all of these constructions it is a well-known fact that the 'erasing material wears off at the ends'and sides of the erasers first, while in many instances that in the middle or body of the eraser remains good and could be used for a vmuch longer time. Should the eraser be used after it is thus worn, its hard ends scratch through the paint or enamel of the board without effecting the purpose for which it wasintended, and in a short time the board becomes so damaged orworn from improper use as to render a new iinish upon it necessary, or its substitution by a new board imperative. It has been found impracticable tore-cover these worn erasers, from the fact that, in order to make them durable until the erasing material is worn out, even at the ends, the material has to be so rigidly secured to the block that the block is injured, or in many cases destroyed,

Serial No. 236,696.' (No model.)

` in the effort to remove the old material for the substitution of the new.

Referring to the drawings, Figurelisa perspective view of my invention ready for use. Fig. 2 is a cross-sectional view on the linex x of Fig. 1.' Fig. 3 is a perspective view with the erasing-strip and clamp-band removed. Fig. 4 is a perspective view showing the erasing-strip on the block with the clamp band removed, and Fig. 5 is a view of the clampingband removed.

Like letters of referencel refer to corresponding parts in each figure of the drawings.

A represents a block of wood or other suitable material, which may be round, oval, oblong, or of any other desirable shape adapted for the use. The block is cut out at its base a to form a central portion, B, which is `extended at some distance below the base to serve as aholder for the erasing material. The base of the block is iiared outward and upward at I) to form a handheld for grasping it With when in use. f Y

On the under side of the central portion, B, there is one or more sheets of felt or other suitable erasing-pads, C, secured by means of glue or other adhesive material. These pads are made somewhat smaller in diameter than the surface of the extended portion B, and are well lled with medium-sized holes or'perforations c, to enable a deposit of chalk-dust around and within them during any cont-innous use upon the blackboard without removing the eraser therefrom.

Around the extended portion B there is placed a thick broad adjustable strip, D, comterial, that extends from the flange a of the base to below the end of the extended portion, terminating on the same plane with thelower surface of the pad C, leaving a space, d, for a dust-chamberA between the strip D and the edge of the pad below the part B.

On the outer side and around the soft eras ingstrip D there is a clamping-band, E, of sheet metal, of less width than the erasingprojecting at right angles therewith 'an ear, F, of about the same width as the band, which ears extend outward from one side or end of the block on a parallel line with each other,

posed of felt or other soft suitable erasing ma-v band. rlhis band has formed at each end and VOO and have screw-holes through them for the insertion of aserew, f, therein, for adjusting the band in holding the strip.

The lower edge of the band E has notches c in its sides about midway its length, and that portion of the edge of the band between the notches is turned inward to form a flange or hold against the side of the erasingstrip to prevent the strip and band from slipping on each other after the band is adj usted thereon.

In operation, when the end or side portions of the erasing-strip D have become Worn so that the wear is upon the ends or sides of the pad G, the serewf is turned partially out and the band loosened sufficiently to enable the strip to be drawn down to provide additional wcaring'surfaee at thc ends. When worn at the ends, after being drawn down once or more, the screw is taken out, the adjustingband E is removed, and the worn portions of the erasing-strip are turned around tothe sides of the holder and a portion of the sides brought toA the ends, where, after being worn in like manner as in the first instance, it may in turn be moved around, bringing a fresh unworn portion ofthe strip upon the ends or part receiving the greatest wear, until the strip is entirely consumed, except so much of it as is necessary to form a hold under the adjustingband. Then the block is made round on its under side, instead of oval or oblong, the erasingstrip wears alike on all sides, and the band E only requires to be loosened and thestrp drawn down from time to time, as it becomes worn, until the erasing material is exhausted,

when its place can be supplied with a new Strip.

Should the pad C become worn and thin after long and continuous use, it being only on the center of the block, it may be scaled off without serious injury to the block and a new pad substituted therefor. llhus it will be seen that by my construction a blackboarderaser is formed that may be used continuously for almost any length of time by occasionally supplying a new adjustable erasing-strip.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent of the United States, is-

1. The combination, with a blaekboarderaser having a reduced extended portion provided with an erasing-pad on its under side, of au adjustable erasingstrip around the extended portion, as and for the purpose set forth.

2. rIhc combination, with ablackboard-eraser having an extended portion provided with a perforated erasing -pad smaller' in diameter 4than the end thereof, of an erasingstrip adj ustabl y secured around the extended portion, with its lower edge on substantially the same plane with the undersurface of the padfas and for the purpose set forth.

3. The combination, with a block for a blackboard-eraser having a reduced extended portion provided with an adjustable erasingstrip around it extending below the under side thereof, ofv an adjusting clamp-band around said strip over the reduced portion of the block, as and for the purpose set forth.

4. The combination, with a blackboard erasing-block having an adjustable erasing-strip around it, of a clamping-band provided with holding-flanges on its edge and ears at its ends for an adjusting-screw, as and for thepurposc set forth.

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

JEROME TRAVIS.

Vitiiesses:

C. D. KEYES, D. KEYES.

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