US184541A - Improvement in flexible blackboards - Google Patents
Improvement in flexible blackboards Download PDFInfo
- Publication number
- US184541A US184541A US184541DA US184541A US 184541 A US184541 A US 184541A US 184541D A US184541D A US 184541DA US 184541 A US184541 A US 184541A
- Authority
- US
- United States
- Prior art keywords
- flexible
- blackboards
- improvement
- blackboard
- minehart
- 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
- 239000010454 slate Substances 0.000 description 6
- 210000000282 Nails Anatomy 0.000 description 4
- 239000004744 fabric Substances 0.000 description 4
- 230000000875 corresponding Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
Images
Classifications
-
- 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
- B43L1/00—Repeatedly-usable boards or tablets for writing or drawing
Definitions
- Figure 1 represents a front View
- Fig. 2 a vertical transverse section, of my improved blackboard, on line :20 as, Fig. 1; and
- Figs. 3 and 4 are a front and rear view of the rubbing-piece.
- the invention relates to an improved blackboard for schools and family purposes, that has the advantage of being readily rolled up into compact shape like a map, to be shipped and stored with greater convenience; and the invention consists of a blackboard made of suitable fabric with a slate surface, and
- A represents a sheet of any suitable fabric and size, according to the purposes required.
- the sheet A is provided with a slate surface of sufficient thickness and elasticity as not to break in handling or rolling up, and not rub off easily by use.
- the slate-covered sheet A is attached to top and bottom rollers or strips B, by which the slate sheet is hung up and stretched.
- the top roller is hung, by two or more rings, a, to hooks or nails, and the lower strip or roller, by means of elastic straps b, with rings d, to fastening-points at such distance below the bottom strip that when the rubber straps are attached, the blackboard is tightly stretched on the wall.
- the chalkmarks are wiped out by means of a moistened sponge or a soft-rubber block, 0. (Shown in Figs. 3 and 4.)
- the blackboard is conveniently rolled up and stored after use, and may be readily and cheaply shipped in the manner of maps to any address.
Description
I. R. MINEHART.
FLEXIBLE BLACKBOARD.
No.184,541. Patented Nov.21, 1876.
UNITED STATES PATENT QFFIGE.
JOHN R. MINEHART, OF BROWNSVILLE, PENNSYLVANIA, ASSIGNOR TO I HARRY W. MINEHART, OF SAME PLACE.
IMPROVEMENT IN FLEXIBLE BLACKBOARDS.-
Specification forming part of Letters Patent No- 184,541, dated November 21, 1 876 application filed April 4, 1876.
To all whom it may concern Be it known that 1, JOHN R. MINEHAR'I, of Brownsville, Fayette county, Pennsylvania, have invented anew and Improved Blackboard, of which the following is a specification:
Figure 1 represents a front View, and Fig. 2 a vertical transverse section, of my improved blackboard, on line :20 as, Fig. 1; and Figs. 3 and 4 are a front and rear view of the rubbing-piece.
Similar letters of reference indicate corresponding parts.
The invention relates to an improved blackboard for schools and family purposes, that has the advantage of being readily rolled up into compact shape like a map, to be shipped and stored with greater convenience; and the invention consists of a blackboard made of suitable fabric with a slate surface, and
mounted on top and bottom rollers, being tightly stretched for use by elastic straps of the lower strip or roller applied to suitable nails. Y In the drawing, A represents a sheet of any suitable fabric and size, according to the purposes required. The sheet A is provided with a slate surface of sufficient thickness and elasticity as not to break in handling or rolling up, and not rub off easily by use.
The slate-covered sheet A is attached to top and bottom rollers or strips B, by which the slate sheet is hung up and stretched. The top roller is hung, by two or more rings, a, to hooks or nails, and the lower strip or roller, by means of elastic straps b, with rings d, to fastening-points at such distance below the bottom strip that when the rubber straps are attached, the blackboard is tightly stretched on the wall.
The chalkmarks are wiped out by means of a moistened sponge or a soft-rubber block, 0. (Shown in Figs. 3 and 4.)
The blackboard is conveniently rolled up and stored after use, and may be readily and cheaply shipped in the manner of maps to any address.
Having thus described myinvention,Iclaim as new and desire 'to secure by Letters Patent The combination of the elastic straps I), having end rings, with the bottom roller or strip of the flexible blackboard A, as and for the purpose set forth.
J B. MINEHART.
Witnesses: A. G. 3009211, B. D. MASON.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US184541A true US184541A (en) | 1876-11-21 |
Family
ID=2253946
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US184541D Expired - Lifetime US184541A (en) | Improvement in flexible blackboards |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US184541A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4254556A (en) * | 1978-05-03 | 1981-03-10 | Lello Anav | Portable drafting device for drawing parallel lines, comprising a working plane of flexible plastic material, adapted to be rolled |
| US7568915B1 (en) | 2005-10-05 | 2009-08-04 | Lavoie Robbie L | Writing board with convertible stand |
-
0
- US US184541D patent/US184541A/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4254556A (en) * | 1978-05-03 | 1981-03-10 | Lello Anav | Portable drafting device for drawing parallel lines, comprising a working plane of flexible plastic material, adapted to be rolled |
| US7568915B1 (en) | 2005-10-05 | 2009-08-04 | Lavoie Robbie L | Writing board with convertible stand |
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