US381363A - Muffled frame for school slates - Google Patents

Muffled frame for school slates Download PDF

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US381363A
US381363A US381363DA US381363A US 381363 A US381363 A US 381363A US 381363D A US381363D A US 381363DA US 381363 A US381363 A US 381363A
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frame
strip
binding
slates
school
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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

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  • the essential feature of my present inven- ⁇ 5 tion consists in the arrangement of the noiseless binding on the edges of the ordinary wooden slate-frame instead of upon the edges of the slate proper, thereby, increasing the utility of the binding and reducing the cost 20 of its manufacture, as hereinafter more fully explained.
  • Figure 1 represents a side view of a slate embodying my invention.
  • Fig. 2 represents an end view
  • Fig. 3 represents a cross-section of a portion thereofon a larger scale than in the preceding figures.
  • Fig. 4 represents a side view of a portion thereof corresponding to Fig. 3.
  • the letterA indicates the slate, and B the wooden slate'frame, constructed of the usual sides and ends and with rounded corners.
  • This binding 0 indicates the noiseless binding upon the edges of the wooden frame.
  • This binding 0 is constructed of an inner or stiffening strip, (Z, (see Figs. 3 and 4) of sheet metal, having an approximately U shape in section, and of reference indicate similar 0 an outer or muffling strip, e, of a soft fabric,
  • the muffling-strip 6 may be of braid or of cloth'-'such as flannel or felt or of leather, and it may be made tubular in the process of its manufacture, or by uniting the longitudinal edges thereof, as by stitching, in which event the seam should be brought within the stiffening-strip.
  • the muftling-strip e is a very effective medium for preventing noise in the general use of the slate, while the stiffening-strip d not only keeps the muffling-strip in proper position, but also reenforces the joints of the wooden frame, due to the employment of sheet metal, thereby materially increasing the strength of the frame.
  • the sheet in eta favors the retention of the nails used for securing the binding to the wooden frame, and, due to the fact that the binding is firmly held to the frame throughout its length, the U-shaped stiffening-strip may be comparatively shallow, so that it can be more readily bent to the outline of the frame, and, conse qnently, be made in one piece without difficulty.
  • the stiffening-strip (I may be left flat in stead of being U-shaped, and in that event the longitudinal edges thereof may be beaded to overlap the surfaces of the frame.

Description

(No Model.)
G. GRAY.
MUFFLED FRAME FOR SCHOOL SLATES.
No. 381,363. Patented Apr. 17, 1888.
WITNESSES:
ATTORNEY.
N PETERS, Phulo-Lflflagnphur. Washington, 0. c.
w W v V thereof.
UNITE STATES PATENT OFFICE.
GEORGE GRAY, OF NEWV YORK, N. Y.
MUFFLED FRAME FOR SCHOOL=SLATES.
SPECIFICATION forming part of Letters Patent No. 381,363, dated April 17, 1888.
Application filed January 1'7, 1887. Serial No. 224,624. (No model.)
IO school-slates with a noiseless binding, and especially a binding of the character shown and described in my Letters Patent of the United States No. 286,196, dated October 9, 1883.
The essential feature of my present inven- {5 tion consists in the arrangement of the noiseless binding on the edges of the ordinary wooden slate-frame instead of upon the edges of the slate proper, thereby, increasing the utility of the binding and reducing the cost 20 of its manufacture, as hereinafter more fully explained.
In the accompanying drawings, Figure 1 represents a side view of a slate embodying my invention. Fig. 2 represents an end view Fig. 3 represents a cross-section of a portion thereofon a larger scale than in the preceding figures. Fig. 4 represents a side view of a portion thereof corresponding to Fig. 3.
Similar letters of parts.
The letterA indicates the slate, and B the wooden slate'frame, constructed of the usual sides and ends and with rounded corners.
0 indicates the noiseless binding upon the edges of the wooden frame. This binding 0 is constructed of an inner or stiffening strip, (Z, (see Figs. 3 and 4) of sheet metal, having an approximately U shape in section, and of reference indicate similar 0 an outer or muffling strip, e, of a soft fabric,
which is tubular in section, and which entirely incloses the stiffening -strip, so that when the binding is put in place a portion of the muffling-strip is interposed between the 5 stiffening-strip and slate-frame, the remaining portion of the mufiling-strip forming an outer covering for the stiffening-strip.
The Lil-shaped stiffeningstrip (1, together with the muttling-strip e, overlaps both surfaces of the frame B, and the stiffening-strip is bent in the direction of its length to conform with the outline of the frame, while both strips are secured to the frame by nails Z, or
other similar fastenings, which are driven through the binding into the edges of the frame at divers points.
The muffling-strip 6 may be of braid or of cloth'-'such as flannel or felt or of leather, and it may be made tubular in the process of its manufacture, or by uniting the longitudinal edges thereof, as by stitching, in which event the seam should be brought within the stiffening-strip.
The muftling-strip e is a very effective medium for preventing noise in the general use of the slate, while the stiffening-strip d not only keeps the muffling-strip in proper position, but also reenforces the joints of the wooden frame, due to the employment of sheet metal, thereby materially increasing the strength of the frame. The sheet in eta], more over, favors the retention of the nails used for securing the binding to the wooden frame, and, due to the fact that the binding is firmly held to the frame throughout its length, the U-shaped stiffening-strip may be comparatively shallow, so that it can be more readily bent to the outline of the frame, and, conse qnently, be made in one piece without difficulty.
The stiffening-strip (I may be left flat in stead of being U-shaped, and in that event the longitudinal edges thereof may be beaded to overlap the surfaces of the frame.
XVhat I claim as new, and desire to secure by Letters Patent, is-
The combination, with a frame of a slate, of a tubular binding of soft fabric and a sheetmetal concave stiffening-strip, said strip being inclosed in the tubular binding and attached with the binding to the periphery of the frame by overlapping its inclosed edge upon each side of the frame and by nails driven through both the fabric and strip into the periphery thereof, thereby muffling the periphery and sides of the frame by a single piece of fabric, substantially as shown and described.
Signed at New York, in the county of New York and State of New York, this 8th day of January, A. D. 1887.
GEORGE GRAY.
Witnesses:
Ours. W AHLERs, FRANK LAVALLL
US381363D Muffled frame for school slates Expired - Lifetime US381363A (en)

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