US490979A - Artificial-slate blackboard - Google Patents
Artificial-slate blackboard Download PDFInfo
- Publication number
- US490979A US490979A US490979DA US490979A US 490979 A US490979 A US 490979A US 490979D A US490979D A US 490979DA US 490979 A US490979 A US 490979A
- Authority
- US
- United States
- Prior art keywords
- slate
- artificial
- black
- blackboard
- concrete
- 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 title description 18
- 239000002184 metal Substances 0.000 description 22
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 8
- 239000004568 cement Substances 0.000 description 8
- 239000006233 lamp black Substances 0.000 description 8
- 239000004576 sand Substances 0.000 description 6
- 239000002361 compost Substances 0.000 description 4
- 239000003550 marker Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005755 formation reaction Methods 0.000 description 2
- 238000000465 moulding 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
- B43L1/04—Blackboards
- B43L1/10—Writing surfaces thereof
Definitions
- This invention relates to concrete, artificial slate black-boards, for use in school-rooms, lecture halls, &c., which concrete formation is reinforced bya sheet metal back, with flanged rims, the said sheet metal being perforated from the back, forming anchor like projections in front, and said flanged rims being perforated from the front, forming similar anchor like projections from said rims rearward, which forward and rearwardly projecting anchors securely hold the concrete of said artificial slate to said reinforce metal back,
- Figure I is a front elevation of our artificial slate or concrete black-board and shows a de- 0 tail of the channel grooved molding that may securesaid black-board to the wall.
- Fig. II is a detail of the metal reinforce backing plate, with its flanged rim and anchor projections; and
- Fig. III is a vertical section 5 taken on line IIIIII, Fig. I and shows the artificial slate or concrete black-board, reinforced by the perforate metal back plate'and flanged rim, and the projecting anchors from the metal plate that secure the concrete 4o thereto.
- rim may, when required, be also con- 5 tinned around the ends of said metal backing plate.
- 3 represent perforations in said metal back, which perforations are punctured from the back forward; without cutting out the metal, so as to form forwardly projecting anchor clinches 4, that in conjunction with each other grasp and clutch the concrete.
- 5 represents like perforations from the front of said flange rim 2, which form like clutch anchors 6 to the anchors 4, except that said anchors 6 present backward, the reverse of the anchors 4, which present forward.
- the above-constituents are composted in preferably the following proportionsz-Oement, (preferably Portland) sixty-four pounds; fine, sharp sand thirty-two pounds; lamp black two pounds; ultra-marine, two pounds; makingin the aggregate one hundred pounds.
- proportionsz-Oement preferably Portland
- cement and sand may be somewhat changed to accord with the grade and consequent price value of the artificial slates or cement black-boards-to be constructed. Also the amount of lamp-black and ultra-marine that enters into the compost,
- the color desired for said artificial slate or black-board may largely depend on the color of the chalk or pencil to be used in marking thereon. For instance, if white chalk is used for the marker a dark slate or black board is desirable, and if on the other handred chalk is used for the marker, then a lighter color with a smaller quantity of lamp black, and a slates or cement black-boards are readily I overlaps it, and the composition molded on [0 seated. the plate Within the flanged rim; substan- In this application we claim the frame to tially as described.
- a black board consisting of a metal back- OMAR A. STEMPEL. ing plate 1 having a flanged rim 2, and punct- In presence ofures 3 and clinches 4 for holding the compo- BENJN.
- A. KNIGHT
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- Adornments (AREA)
Description
(No'ModeL) H. A. NEWMAN, J. D. WERDEN & 0. A. STEMPEL.
ARTIFICIAL SLATE BLAGKBOARD- Patented Jan. 31, 1893'.
aeW/ a 3.
ma H {Z9 50% Ateszi;
We NORRIS PETERS co, PHOYO-LITHOY, WASHINGTON, o. a
UNITED STATES Y HENRY A. NEWVMAN, OF HUNTSVILLE, JAMES D. WERDEN, OF KANSAS CITY,
PATENT OFFICE.
AND OMAR A. STEMPEL, OF ST. LOUIS, ASSIGNORS OF ONE-FOURTH TO- THOMAS M. ELMORE, OF HUNTSVILLE, MISSOURI.
ARTIFICIAL-SLATE BLACKBOARD.
SPECIFICATION forming part of Letters Patent No. 490,979, dated January 31, 1893.
Application filed February 6, 1892. Serial No. 420,520. (No specimens.)
To all whom it may concern.-
Be it known that we, HENRY A. NEWMAN, of Huntsville, Randolph county, JAMES D. WERDEN, of Kansas City, in the county of Jackson, and OMAR A. STEMPEL, of the city of St. Louis, State of Missouri, have invented a certain new and useful Improvement in Artificial-Slate Blackboards, of which the following is a full, clear, and exact descripro tion, reference being had to the accompanying drawings, forming part of this specification.
This invention relates to concrete, artificial slate black-boards, for use in school-rooms, lecture halls, &c., which concrete formation is reinforced bya sheet metal back, with flanged rims, the said sheet metal being perforated from the back, forming anchor like projections in front, and said flanged rims being perforated from the front, forming similar anchor like projections from said rims rearward, which forward and rearwardly projecting anchors securely hold the concrete of said artificial slate to said reinforce metal back,
2 5 and rim; and the invention further consists in features of novelty hereinafter fully described and pointed out in the claim.
Figure I is a front elevation of our artificial slate or concrete black-board and shows a de- 0 tail of the channel grooved molding that may securesaid black-board to the wall. Fig. II is a detail of the metal reinforce backing plate, with its flanged rim and anchor projections; and Fig. III is a vertical section 5 taken on line IIIIII, Fig. I and shows the artificial slate or concrete black-board, reinforced by the perforate metal back plate'and flanged rim, and the projecting anchors from the metal plate that secure the concrete 4o thereto.
Referring to the drawings:1 represents the metal reinforce backing plate, and 2 is the flange rim at the foot and top of said plate,
. which rim may, when required, be also con- 5 tinned around the ends of said metal backing plate. 3 represent perforations in said metal back, which perforations are punctured from the back forward; without cutting out the metal, so as to form forwardly projecting anchor clinches 4, that in conjunction with each other grasp and clutch the concrete. 5 represents like perforations from the front of said flange rim 2, which form like clutch anchors 6 to the anchors 4, except that said anchors 6 present backward, the reverse of the anchors 4, which present forward. 7 represents our artificial slate or concrete black-board compost, which after compounding is filled in said metal back reinforce frame, flush with the flange rims 2, and is composed of the following ingredientsz- Cement (preferably Portland), fine, sharp sand, lamp-black and ultra-marine.
The above-constituents are composted in preferably the following proportionsz-Oement, (preferably Portland) sixty-four pounds; fine, sharp sand thirty-two pounds; lamp black two pounds; ultra-marine, two pounds; makingin the aggregate one hundred pounds.
The respective amounts of cement and sand may be somewhat changed to accord with the grade and consequent price value of the artificial slates or cement black-boards-to be constructed. Also the amount of lamp-black and ultra-marine that enters into the compost,
may be varied in accordancewith the color required for said construction.
The color desired for said artificial slate or black-board, may largely depend on the color of the chalk or pencil to be used in marking thereon. For instance, if white chalk is used for the marker a dark slate or black board is desirable, and if on the other handred chalk is used for the marker, then a lighter color with a smaller quantity of lamp black, and a slates or cement black-boards are readily I overlaps it, and the composition molded on [0 seated. the plate Within the flanged rim; substan- In this application we claim the frame to tially as described.
which the composition is applied. HENRY A. NEWVMAN.
5' We claim as our invention:- JAMES D. WERDEN.
A black board consisting of a metal back- OMAR A. STEMPEL. ing plate 1 having a flanged rim 2, and punct- In presence ofures 3 and clinches 4 for holding the compo- BENJN. A. KNIGHT,
sition to the plate and to therim whose flange SAML. KNIGHT.
Publications (1)
Publication Number | Publication Date |
---|---|
US490979A true US490979A (en) | 1893-01-31 |
Family
ID=2559825
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US490979D Expired - Lifetime US490979A (en) | Artificial-slate blackboard |
Country Status (1)
Country | Link |
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US (1) | US490979A (en) |
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0
- US US490979D patent/US490979A/en not_active Expired - Lifetime
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