US154357A - Improvement in blackboard-rubbers - Google Patents
Improvement in blackboard-rubbers Download PDFInfo
- Publication number
- US154357A US154357A US154357DA US154357A US 154357 A US154357 A US 154357A US 154357D A US154357D A US 154357DA US 154357 A US154357 A US 154357A
- Authority
- US
- United States
- Prior art keywords
- improvement
- blackboard
- rubbers
- joseph
- wood
- 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 6
- 239000005060 rubber Substances 0.000 title description 6
- 239000002023 wood Substances 0.000 description 4
- 239000001828 Gelatine Substances 0.000 description 2
- 229920000159 gelatin Polymers 0.000 description 2
- 235000019322 gelatine Nutrition 0.000 description 2
- 239000011148 porous material 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
Description
UNI'IED STATES PATENT OFFICE.
JOSEPH B. WALKER5 OF LOUISVILLE KENTUCKY.
IMPROVEMENT IN BLACKBOARDRUBBERS.
Specification forming Part o f Letters Patent N0. 154,357, dated August 25, 1874; application fi1ed J anuary 2, 1874.
T0 all whom z't may concem Be il: known that I, JOSEPH B. WAL'KER, of
.the eity of Louisville, in the eounty 0f J efi'erson and State 0f Kentucky, have invented a new Rubber t0 Erase Ohalk-Marks from Blackboards and other surfaees and do hereby declare that the, fol'lowing is a full am]. exact; description of the same.
I take a block -0f wood of any convenient size, say six inehe s long, two inches wide, and one und a half ineh thick. I 01113 01 mold the edges t0 giVe conveuient hold for grasping With the fingers, als shown in the aeeonhpany-- ing drawing. I next groove theunder surface to admit folds 0f heavy eloth (as sail-duck) '00 form a brush'or rubber; I then stop the pores 0f the wood with a solution of gelatine, am].
bing is efl'eeted by the ends of the threads,
and arranged as deseribed, so that the threads ran diagonaflly 130 thje= i=ubbing-surt'aee, substantially as aindfor. th@ purpose set forth.
J OS. B. WALKER. Witnesses:
FRANK O. ANDERSON, F. A. COOPER.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US154357A true US154357A (en) | 1874-08-25 |
Family
ID=2223767
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US154357D Expired - Lifetime US154357A (en) | Improvement in blackboard-rubbers |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US154357A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040246896A1 (en) * | 2003-06-06 | 2004-12-09 | Hoang Khoi Nhu | Optical network topology databases based on a set of connectivity constraints |
-
0
- US US154357D patent/US154357A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040246896A1 (en) * | 2003-06-06 | 2004-12-09 | Hoang Khoi Nhu | Optical network topology databases based on a set of connectivity constraints |
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