US164173A - Improvement in blackboard-rubbers - Google Patents
Improvement in blackboard-rubbers Download PDFInfo
- Publication number
- US164173A US164173A US164173DA US164173A US 164173 A US164173 A US 164173A US 164173D A US164173D A US 164173DA US 164173 A US164173 A US 164173A
- Authority
- US
- United States
- Prior art keywords
- blackboard
- handle
- rubbers
- improvement
- erasing
- 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
- 229920001971 elastomer Polymers 0.000 title description 10
- 239000005060 rubber Substances 0.000 title description 10
- 239000000463 material Substances 0.000 description 20
- 239000002184 metal Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000010959 steel 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
- A47L13/28—Polishing implements
- A47L13/29—Polishing implements having movable or detachable polishing or shining cloths
Definitions
- This invention relates to that class of blackboard-erasers which have a continuous piece of carpet, or other material, so secured to a block that the carpet can be turned upon the block, when partly worn, presenting for use anew surfaoe; and it consists in providing a block, which receives the carpeting with a recess, and connecting to said block a handle adapted to enter said recess, and force the carpeting down therein, tightening the same and holding itin place.
- A represents the main block; B, the handle; 0, the metal strips, by means of which A and B are connected together; D, the carpeting, or other material used for erasing.
- the upper portion of the block A is recessed, as shown at c.
- the lower part I) of the handle B has a shape similar to that of the recess 0.
- the two parts A B are secured together by means of metal pieces 0, which, for durability may be made of steel, as shown.
- C is connected to A at two points, a a, and to B at a single point, d, by means of headed pins, screws,or in other suitable manner, and so that the handle B is pivoted to the the part C.
- the erasing material D is a continuous strip of material into which the block A is to be inserted before the parts C are secured thereto. Then the parts C are to be secured both to A and B, as described, the part B being in the position represented by the dotted lines in Fig. 2. Then, by turning the handle B, and bringing it into the position represented in Fig. 2, the loose material will be forced down into the recess 0 by the lower part of the handle, and the several parts will be firmly secured in place.
- the dotted lines in the lower part of Fig. 2 indicate the position of the erasing material when it is first applied to A, and before the handle B has been brought to its place. 7
- D can be turned upon A, so as to present a new erasing-surface.
- the entire surface of the erasing material D has become worn so as to be unfit for use, one of the connectingpieces C can be easily removed, and the worn erasing materialD be replaced by a new piece.
- the distance between A and B depends upon the thickness of the erasing material used.
- the part b of the handle B might be made slightly eccentric, but I do not deem this necessary.
- a blackboard rubber consisting of the parts A, B, C, and D, constructed and arranged to operate substantially as and for the purposes specified.
Description
D. JAG-KSO N.
Buck-Board Rubber. N0.164,l73 Patentedl'une8,1875.
Fig- I Witnessesf Inventor.
NITED STATES PATENT OFFICE.
DAVID JACKSON, OF CHICAGO, ILL, ASSIGNOR TO ALFRED H. ANDREWS, HERBERT L. ANDREWS, AND THOMAS S. HAYDEN, OF SAME PLACE.
IMPROVEMENT IN BLACKBOARD-RUBBERS.
Specification forming part of Letters Patent No. 164,173, dated June 8, 1875 application filed March 9, 1875.
To all whom it may concern Be it known that I, DAVID JACKSON, of the city of Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Blackboard-Rubbers or Erasers, of which the following is a full description, reference being had to the accompanying drawings, in which- Figure l is a side elevation Fig. 2 an end View.
This invention relates to that class of blackboard-erasers which have a continuous piece of carpet, or other material, so secured to a block that the carpet can be turned upon the block, when partly worn, presenting for use anew surfaoe; and it consists in providing a block, which receives the carpeting with a recess, and connecting to said block a handle adapted to enter said recess, and force the carpeting down therein, tightening the same and holding itin place.
In the drawings, A represents the main block; B, the handle; 0, the metal strips, by means of which A and B are connected together; D, the carpeting, or other material used for erasing. The upper portion of the block A is recessed, as shown at c. The lower part I) of the handle B has a shape similar to that of the recess 0. The two parts A B are secured together by means of metal pieces 0, which, for durability may be made of steel, as shown. C is connected to A at two points, a a, and to B at a single point, d, by means of headed pins, screws,or in other suitable manner, and so that the handle B is pivoted to the the part C. The erasing material D is a continuous strip of material into which the block A is to be inserted before the parts C are secured thereto. Then the parts C are to be secured both to A and B, as described, the part B being in the position represented by the dotted lines in Fig. 2. Then, by turning the handle B, and bringing it into the position represented in Fig. 2, the loose material will be forced down into the recess 0 by the lower part of the handle, and the several parts will be firmly secured in place. The dotted lines in the lower part of Fig. 2, indicate the position of the erasing material when it is first applied to A, and before the handle B has been brought to its place. 7
After the surface of the erasing material on the face of A has been worn by loosening the handle, and bringing it again into the position shown by the dotted lines in Fig. 2, D can be turned upon A, so as to present a new erasing-surface. When the entire surface of the erasing material D has become worn so as to be unfit for use, one of the connectingpieces C can be easily removed, and the worn erasing materialD be replaced by a new piece. The distance between A and B depends upon the thickness of the erasing material used. The part b of the handle B might be made slightly eccentric, but I do not deem this necessary.
I do not claim, broadly, an eraser having a continuous strip of erasing material provided with an interior support, and combined with a handle; but
What I do claim as new, and desire to secure by Letters Patent, is as follows:
A blackboard rubber, consisting of the parts A, B, C, and D, constructed and arranged to operate substantially as and for the purposes specified.
DAVID JACKSON. Witnesses:
E. A. WEsT, 0. W. Bonn.
Publications (1)
Publication Number | Publication Date |
---|---|
US164173A true US164173A (en) | 1875-06-08 |
Family
ID=2233582
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US164173D Expired - Lifetime US164173A (en) | Improvement in blackboard-rubbers |
Country Status (1)
Country | Link |
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US (1) | US164173A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040007242A1 (en) * | 2002-04-22 | 2004-01-15 | Rothmans, Benson & Hedges Inc. | Low ignition propensity cigarette having oxygen donor metal oxide in the cigarette wrapper |
US20090223529A1 (en) * | 2008-02-22 | 2009-09-10 | Schweitzer-Mauduit International, Inc. | Treated Areas on a Wrapper For Reducing the Ignition Proclivity Characteristics of a Smoking Article |
-
0
- US US164173D patent/US164173A/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040007242A1 (en) * | 2002-04-22 | 2004-01-15 | Rothmans, Benson & Hedges Inc. | Low ignition propensity cigarette having oxygen donor metal oxide in the cigarette wrapper |
US20090223529A1 (en) * | 2008-02-22 | 2009-09-10 | Schweitzer-Mauduit International, Inc. | Treated Areas on a Wrapper For Reducing the Ignition Proclivity Characteristics of a Smoking Article |
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