US890342A - Blackboard-eraser. - Google Patents

Blackboard-eraser. Download PDF

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Publication number
US890342A
US890342A US1907381280A US890342A US 890342 A US890342 A US 890342A US 1907381280 A US1907381280 A US 1907381280A US 890342 A US890342 A US 890342A
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Prior art keywords
strips
eraser
felt
wood
edges
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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Inventor
Edward P Dean
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Edward P Dean
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    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47LDOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L11/00Machines for cleaning floors, carpets, furniture, walls, or wall coverings
    • A47L11/02Floor surfacing or polishing machines
    • A47L11/10Floor surfacing or polishing machines motor-driven
    • A47L11/14Floor surfacing or polishing machines motor-driven with rotating tools
    • A47L11/16Floor surfacing or polishing machines motor-driven with rotating tools the tools being disc brushes
    • A47L11/164Parts or details of the brushing tools

Description

PATENTED JUNE 9, 1908.

B. P. DEAN. BLAGKBOARD ERASER. APPLICATION FILED JUNE 28,1907.

WITNESSES: fl/kd EDWARD P. DEAN, OF ASHLAND, OHIO.

BLACKBOARD-ERASER.

Specification of Letters Patent.

Patented June 9, 1908.

r Application filed June 28, 1907. Serial No. 381,280.

To all whom it may concern:

Be it known that I, EDWARD P. DEAN, a citizen of the United States, residing at Ashland, in the county of Ashland, State of Ohio, 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.

This invention has relation to blackboard erasers, that are employed to clear the face of the board from chalk or crayon lines or marks made thereon.

Various problems are presented in the production of an eraser of the character described that will overcome all difliculties and objections thereto. In the first place, the erasure of the chalk or crayon marks necessitates the removal of the dust or particles forming the said marks from the board. If the eraser only brushes the dust off the board, it is simply thrown into the atmosphere and becomes a menace to the health of scholars and teachers. If the dust is taken up in the eraser, it must be frequently freed from the latter or it will soon become ineflicient. Other points, such as noiselessness, durability, readiness of use, and entire efliciency are encountered.

It is the object of my invention to provide an eraser that will at once overcome the ob j ections and mischiefs mentioned and enhance the efficiency of the device in various desirable respects.

The nature of the invention is fully and clearly ascertainable from the device portrayed in the annexed drawings, forming a part of this specification, in view of which it will first be described with respect to its construction and mode of use, and then be pointed out in the subjoined claim.

Of the said drawingsFigure 1 is a perspective view of the invention. Fig. 2 1s a transverse section.

Similar characters of reference designate similar parts or features, as the case may be, wherever they occur.

In the drawings, 4 designates the edges; 5, the sides, and, 6, the ends of theeraser. As the edges, 4, are employed to rub the board the eraser may be said to be double or of dual characterthat is, it presents two efficient erasing faces, both of which may be used.

In the construction of the eraser, I employ alternate strips of high-grade firm wool felt and narrower strips of wood, the former extending to the ends of the latter and a very considerable distance beyond the sides thereof. The said layers or strips may be as many in number as may be necessary to form an eraser of the required size, and they may be connected or secured together in any suitable manner. As herein shown, the device is formed from four strips of felt, B, with three intermediate strips of wood, A; the strips of felt being secured to the sides of the strips of wood by cement, and the entire structure bound firmly and compactly together by a band, 7, passed centrally around the ends and sides and secured in that position.

Inasmuch as the sides of the wood strips A are not coextensive with the same portions of the felt strips, the margins of the latter are maintained in spaced relationship, as shown at 8 in the drawings.

I The strips A of wood will, of course, be relatively thin, and since they are employed to space the margins of the strips of felt and imp art stiffness and compactness to the body, it would not be a material departure from my invention to form them from other material than wood, nor to make one or more of the said strips of metal.

In use, the edges 4, will, be used to erase the marks on the board, and the dust wiped off by the felt strips will be collected in the interspaces 8 and not be thrown off into the atmosphere, and as the two edges, 4, can be used the eraser can be employed for quite a long period before it becomes so filled with dust as to be made inefficient, and when the time comes to renovate the device it can be taken to some out-of-the-way place and cleaned by jarring the ends 6 on a stationary object, running a stick through the interspaces 8, and brushing or wiping off the felt edges and ends.

It is obvious that the device is noiseless in character, so that if it should happen to fall upon the floor it would not disturb or annoy any one. I

It is also apparent that the invention can be easily and economically constructed and that it will be of quite a durable nature, and in all respects desirable.

What is claimed is A blackboard eraser comprising alternate strips of felt and wood secured firmly together the strips of felt extending at their 0pposite edges beyond the strips of wood leaving dust-collecting interspaces between the layers of felt at their margins, and a stout band passed centrally about the ends and 10 sides of the device between their opposite edges.

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

EDWARD P. DEAN. Witnesses BENJ. W. MGORAY, H. L. McCRAra

US890342A 1907-06-28 1907-06-28 Blackboard-eraser. Expired - Lifetime US890342A (en)

Priority Applications (1)

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US890342A US890342A (en) 1907-06-28 1907-06-28 Blackboard-eraser.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US890342A US890342A (en) 1907-06-28 1907-06-28 Blackboard-eraser.

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US890342A true US890342A (en) 1908-06-09

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US890342A Expired - Lifetime US890342A (en) 1907-06-28 1907-06-28 Blackboard-eraser.

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3257679A (en) * 1965-10-18 1966-06-28 Joseph Dixon Crucible Co Chalkboard cleaning device
US5651835A (en) * 1995-08-07 1997-07-29 Skidmore; Forrest G. Model railroad wheel cleaning equipment and method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3257679A (en) * 1965-10-18 1966-06-28 Joseph Dixon Crucible Co Chalkboard cleaning device
US5651835A (en) * 1995-08-07 1997-07-29 Skidmore; Forrest G. Model railroad wheel cleaning equipment and method

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