US135487A - Improvement in blackboard-erasers - Google Patents

Improvement in blackboard-erasers Download PDF

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US135487A
US135487A US135487DA US135487A US 135487 A US135487 A US 135487A US 135487D A US135487D A US 135487DA US 135487 A US135487 A US 135487A
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Prior art keywords
erasers
blackboard
improvement
corduroy
ribs
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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
    • A47L13/00Implements for cleaning floors, carpets, furniture, walls, or wall coverings
    • A47L13/10Scrubbing; Scouring; Cleaning; Polishing
    • A47L13/16Cloths; Pads; Sponges

Description

W.S.READ.
Black Board-Erasers.
Patented Feb. 4,1873.
@ummm imam:
FER
gtturneg.
/vsls PRaasss) UNITED STATES PATENT OFFICE.
WINFIELD S. READ, OF OAKLAND, CALIFORNIA.
IMPROVEMENT IN BLACKBOARD-ERASERS.
Specification forming part of Letters Patent No. 135.1187, dated; February 4, 1873.
To all whom it may concern:
of the eraser with a part broken away to show the construction.
Similar letters of reference indicate corresponding parts.
A is a wooden block or the back of the eraser, of suitable size, usually about three inches wide and eight inches long, with its side edges grooved to afford a hold for the hand, as represented in the drawing. B is a wadding; and U represents a carpeting over the wadding,
the wadding and carpeting being equal in size to the side of the block. Over these layers I place my corduroy or ribbed covering D, which is of sufficient size to lap over the inclosed soft layers onto the wood A, so as to be confined to the wood by means of a strip of leather, E, and nails F, as seen in the drawing.
The corduroy covering D is so placed that the ribs thereof run longitudinally, as repre sented 5 but" I do not confine myself to that particular arrangement, as the ribs may run transversely or diagonally, if desired; but the eraser would be rendered less useful thereby.
The advantages of this corduroy or ribbed covering is, the chalk-dust will be detached from the blackboard by the ribs and will find a lodgment in the grooves between the ribs, from whence it readily drops into the chalkbox below. The chalk-dust is not compressed and ground into the surface, as in the ordinary eraser, but the ribbed wearing surface is kept clean while it perfectly wipes and leaves `a clean surface on the board.
I do not confine myself to the particular goods known as corduroy, as other ribbed goods maybe employed.
Having thus described my invention, Iclaim as new and desire to secure by Letters Patent- 1. A blackboarderaser having a surface composed of ribs and grooves, substantially as and for the purposes described.
2. An eraser having a face covered with corduroy or similar. material over a soft cushion of wadding and carpeting, or similar material, substantially as shown and described.
WINFIELD S. READ.
4 Witnesses: l
S. F. GILeEEsT, v WM. M. GILcREsT.
US135487D Improvement in blackboard-erasers Expired - Lifetime US135487A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2676826C2 (en) * 2014-05-19 2019-01-11 Федераль-Могуль Фридберг Гмбх Piston ring containing groove around ring circumference

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2676826C2 (en) * 2014-05-19 2019-01-11 Федераль-Могуль Фридберг Гмбх Piston ring containing groove around ring circumference

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