US412876A - Blackboard-eraser - Google Patents
Blackboard-eraser Download PDFInfo
- Publication number
- US412876A US412876A US412876DA US412876A US 412876 A US412876 A US 412876A US 412876D A US412876D A US 412876DA US 412876 A US412876 A US 412876A
- Authority
- US
- United States
- Prior art keywords
- block
- blackboard
- strips
- eraser
- 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
- 230000001154 acute Effects 0.000 description 16
- 238000010276 construction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002023 wood 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
- A47L11/00—Machines for cleaning floors, carpets, furniture, walls, or wall coverings
- A47L11/02—Floor surfacing or polishing machines
- A47L11/10—Floor surfacing or polishing machines motor-driven
- A47L11/14—Floor surfacing or polishing machines motor-driven with rotating tools
- A47L11/16—Floor surfacing or polishing machines motor-driven with rotating tools the tools being disc brushes
- A47L11/164—Parts or details of the brushing tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
- B43L21/00—Blackboard or slate cleaning devices
Definitions
- This invention relates to blackboard-eras ers of the class shown in Letters Patent of the United States No. 190,662, dated May 15,
- blackboard-erasers of this class have been rectangular in form and the corners have been either rounded or square, which renders it difficult to erase small lines and marks or a single character without erasing adjacent lines or characters.
- the object of this invention is to provide an improved blackboard-eraser which will avoid the above objection and at the same time improve the construction of the erasingsurface, which I accomplish as illustrated in the drawings, and as hereinafter described and claimed.
- This block A is cut diagonally to the sides, thereby forming an acute angle a with one of the sides.
- I) c are strips of felt or other suitable ma- 3 5 terial for an erasing-surface, which are glued or otherwise secured to the block A.
- Fig. 2 is an side strips 1) are secured, one along each side edge of the block A, and a number of crossstrips 0 are secured diagonally across the'space between the side strips and parallel to the ends 1. of the block A.
- the end strips 0 and side strips 1) also form an acute angle at the acute angle a of the block A, thus furnishing a point which may be used for erasing small lines and marks or a single character Without erasing or rubbing the adjacent characters or marks.
- the spaces between the strips 0 form channels in which the chalk may collect.
- the diagonal strips 0 also form abettererasingsurface than that furnished by strips placed at right angles to the sides of the block or by those placed parallel to the sides of the block, as has been proven by actual test.
- a blackboard-eraser comprising a block-handle having one end extending at an acute angle to its side, and felt or other erasive material secured to the face of the blockhandle, and having one end extending at an acute angle to the side and coinciding with the acute-angled end of the block-handle, substantially as described.
- a blackboard-eraser comprising a blockhandle having its opposite ends extending diagonally to its sides to form acute angles a, the parallel side erasing-strips 17, secured to the block-handle and having diagonal ends to form acute angles coinciding with the acute angles at the ends of the block-handle, and diagonal erasing-strips a, secured to the block-handle between the parallel side strips, substantially as described.
Landscapes
- Drawing Aids And Blackboards (AREA)
Description
(NoMdel) T, H. COSTELLO.
BLAGKBOARD BRASER.
No. 412,876. Patented Oct. 15, 1889.
N. PETERS. whuwumo nu. Warhiuglnm 11c UNITED STATES AIENT OFFICE,
THOMAS H. OOSTELLO, OF LAKE, ASSIGNOR TO A. H. ANDREWS dz COMPANY,
OF CHICAGO, ILLINOIS.
BLACKBOARD-ERASER.
SPECIFICATION forming part of Letters Patent No. 412,876, dated October 15, 1889.
Application filed June 20, 1889i Serial No. 315,015. (No model.)
To all whom it may concern.-
Be it known that I, THOMAS II. COSTELLO, residing in the town of Lake, in the county of Cook and State of Illinois, and a citizen of 5 the United States, have invented a new and useful Improvement in Blackboard-Erasers, of which the following is a specification, reference being had to the accompanying drawings, in which- Figure 1 is a side elevation.
under side view.
This invention relates to blackboard-eras ers of the class shown in Letters Patent of the United States No. 190,662, dated May 15,
I5 1877, granted to Herbert L. Andrews.
As heretofore made, blackboard-erasers of this class have been rectangular in form and the corners have been either rounded or square, which renders it difficult to erase small lines and marks or a single character without erasing adjacent lines or characters.
The object of this invention is to provide an improved blackboard-eraser which will avoid the above objection and at the same time improve the construction of the erasingsurface, which I accomplish as illustrated in the drawings, and as hereinafter described and claimed.
In the drawings, A represents a block of Wood which forms the handle of an eraser.
One or both ends of this block A are cut diagonally to the sides, thereby forming an acute angle a with one of the sides.
I) c are strips of felt or other suitable ma- 3 5 terial for an erasing-surface, which are glued or otherwise secured to the block A. The
Fig. 2 is an side strips 1) are secured, one along each side edge of the block A, and a number of crossstrips 0 are secured diagonally across the'space between the side strips and parallel to the ends 1. of the block A. The end strips 0 and side strips 1) also form an acute angle at the acute angle a of the block A, thus furnishing a point which may be used for erasing small lines and marks or a single character Without erasing or rubbing the adjacent characters or marks. The spaces between the strips 0 form channels in which the chalk may collect. The diagonal strips 0 also form abettererasingsurface than that furnished by strips placed at right angles to the sides of the block or by those placed parallel to the sides of the block, as has been proven by actual test.
What I claim as new, and desire to secure by Letters Patent, is 1. As an improved article of manufacture,
a blackboard-eraser comprising a block-handle having one end extending at an acute angle to its side, and felt or other erasive material secured to the face of the blockhandle, and having one end extending at an acute angle to the side and coinciding with the acute-angled end of the block-handle, substantially as described.
2. A blackboard-eraser comprising a blockhandle having its opposite ends extending diagonally to its sides to form acute angles a, the parallel side erasing-strips 17, secured to the block-handle and having diagonal ends to form acute angles coinciding with the acute angles at the ends of the block-handle, and diagonal erasing-strips a, secured to the block-handle between the parallel side strips, substantially as described.
THOS. H. COSTELLO. lVitnesses:
HARRY T. J ONES, ALBERT H. ADAMS.
Publications (1)
Publication Number | Publication Date |
---|---|
US412876A true US412876A (en) | 1889-10-15 |
Family
ID=2481808
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US412876D Expired - Lifetime US412876A (en) | Blackboard-eraser |
Country Status (1)
Country | Link |
---|---|
US (1) | US412876A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2987744A (en) * | 1959-10-21 | 1961-06-13 | Ott Robert | Brush having detachable sections |
-
0
- US US412876D patent/US412876A/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2987744A (en) * | 1959-10-21 | 1961-06-13 | Ott Robert | Brush having detachable sections |
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