US135487A - Improvement in blackboard-erasers - Google Patents
Improvement in blackboard-erasers Download PDFInfo
- Publication number
- 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
- Authority
- US
- United States
- Prior art keywords
- erasers
- blackboard
- improvement
- corduroy
- ribs
- Prior art date
- 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
Links
- 210000000614 Ribs Anatomy 0.000 description 10
- 239000000428 dust Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000002023 wood Substances 0.000 description 4
- 210000000282 Nails Anatomy 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000000875 corresponding Effects 0.000 description 2
- 239000010985 leather Substances 0.000 description 2
Images
Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L13/00—Implements for cleaning floors, carpets, furniture, walls, or wall coverings
- A47L13/10—Scrubbing; Scouring; Cleaning; Polishing
- A47L13/16—Cloths; Pads; Sponges
Definitions
- 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 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.
- a blackboarderaser having a surface composed of ribs and grooves, substantially as and for the purposes described.
- 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.
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.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US135487A true US135487A (en) | 1873-02-04 |
Family
ID=2204903
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US135487D Expired - Lifetime US135487A (en) | Improvement in blackboard-erasers |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US135487A (en) |
Cited By (1)
| 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 |
-
0
- US US135487D patent/US135487A/en not_active Expired - Lifetime
Cited By (1)
| 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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