US451336A - School-slate - Google Patents

School-slate Download PDF

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US451336A
US451336A US451336DA US451336A US 451336 A US451336 A US 451336A US 451336D A US451336D A US 451336DA US 451336 A US451336 A US 451336A
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slate
edges
strip
binding
frame
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
    • H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
    • H01L21/76—Making of isolation regions between components
    • H01L21/762—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers
    • H01L21/76224—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers using trench refilling with dielectric materials
    • H01L21/76229—Concurrent filling of a plurality of trenches having a different trench shape or dimension, e.g. rectangular and V-shaped trenches, wide and narrow trenches, shallow and deep trenches

Definitions

  • A represents an ordinary slate.
  • B B are two continuous framing-strips of metal cut to partially frame the slate, placed on 'opposite sides and extending over the edges thereof, as shown.
  • the buffer may be made tubular and inclose a heavy lling cord or roll F and a filling-strip D, which is inserted'between the edges of the slate and cord F.
  • the cord and strip may be of paper or any suitable material and might be formed integral.
  • the strips B are preferably slightly beveled on their edges, as shown.
  • the binding O with cord Fand strip D and the frame-strips B they are pressed into proper frame shape and the parts secured together by rivets E, as indicated in the drawings.
  • any suitable fastenings may be used to unite the parts, such as eyelets or staples in place of rivets.
  • XVe prefer to use a heavy cord or roll F of paper or other suitable material covered with cloth or felt binding, as O, substantially as shown; but evidently in some instances the binding C and cord F or binding-cord and strip D might be made integral of the same material, such as rubber, paper, dac., if desired, and secured to the edges of the slate, as described.
  • a slate-frame the combination of a strip surrounding'the edge of the slate, a roll extending around said strip, a binding inclosing both roll and strip and extending inwardlyover the edges of the slate, with two independent frame-strips inclosing parts of the binding-strip and edges of slate and united to fasten all parts of the frame together, substantially as described.

Description

(No Model.)
H. S. SEMMEL, J. W. BALLIET 8v S. J. SCHAFFER. SGHOOL SLATB.
No. 451,336. Patented Apr. 28, 1891.
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UNITED STATES PATENT OFFICEo A' HOVARD SAMUEL SEMMEL, JOHN TILLIAM BALLIET, AND STEPHEN JOSHUA SOHAFFER, OF SLATINGTON, PENNSYLVANIA.
scHooL-SLATE."
SPECIFICATION forming part of Letters Patent No. 451,336, dated April 28, 1891, Application filed December l, 1890. Serial No. 373,108. (No model.)
To @ZZ whom it may concern:
Be it known that we, HOWARD SAMUEL SEM- MEL, JOHN WILLIAM BALLIE'I, and STEPHEN JOSHUA SCHAEFER, all citizens of the United States, residing in the borough of Slatington, county of Lehigh, and State of Pennsylvania, have invented new and useful improvements in School-Slates, of which the following is a specification.
This invention ,is an improvement in schoolslates, and its object is to provide a cheap, noiseless, and durable frame for the slates; and it consists in the novel lconstruction of the frame, as will be clearly understood from the following description and claims, when taken in connection with the accompanying drawings, in which- Figure l is a facev view of the slate and frame. Figs. 2 and 3 are enlarged detail sectional views thereof.
A represents an ordinary slate.
B B are two continuous framing-strips of metal cut to partially frame the slate, placed on 'opposite sides and extending over the edges thereof, as shown.
O designates the binding or buffer surrounding the edges of the slate and formed of any suitable material, as felt, and nearly a complete circle in cross-section, but having lateral inwardly-extending lips c c, which embrace the edges of the slate. The buffer may be made tubular and inclose a heavy lling cord or roll F and a filling-strip D, which is inserted'between the edges of the slate and cord F. The cord and strip may be of paper or any suitable material and might be formed integral., The binding O is drawn tightly over the cord and strip, and the lips c extend over the edges of the slate even with the inside edges of the strip B, which cover the said lips and inclosed strip D and slate edges, as shown, thereby protecting the slate, as indicated at as Fig. 3. The strips B are preferably slightly beveled on their edges, as shown. After applying the binding O with cord Fand strip D and the frame-strips B they are pressed into proper frame shape and the parts secured together by rivets E, as indicated in the drawings. Of course any suitable fastenings may be used to unite the parts, such as eyelets or staples in place of rivets. XVe prefer to use a heavy cord or roll F of paper or other suitable material covered with cloth or felt binding, as O, substantially as shown; but evidently in some instances the binding C and cord F or binding-cord and strip D might be made integral of the same material, such as rubber, paper, dac., if desired, and secured to the edges of the slate, as described. We prefer to make the framestrips B of metal 5 but they can be made of any suitable stilmaterial, as wood.
Vhat we therefore claim as new isl. The combination of the slate and the binding or buffer surrounding and having laterally-projecting lips inclosing the edges ofthe slate, with the independent frame-strips on opposite sides of the slate applied over said lips and united together through the lips at the edges of the slate, so as to bind the buffer thereto, substantially as described.
2. The combination of the independent frame-strips B, the binding or buffer O, having a roll F, strip D, and lips c, constructed and arranged substantially as specied.
3. In a slate-frame, the combination of a strip surrounding'the edge of the slate, a roll extending around said strip, a binding inclosing both roll and strip and extending inwardlyover the edges of the slate, with two independent frame-strips inclosing parts of the binding-strip and edges of slate and united to fasten all parts of the frame together, substantially as described.
HOWARD SAMUEL SEMMEL. JOHN ILLIAINI BALLIET. STEPHEN JOSHUA SOHAFFER.
Witnesses:
LUTHER CAMPBELL, WILLIAM M. SELL.
US451336D School-slate Expired - Lifetime US451336A (en)

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