US278744A - Noiseless slate - Google Patents

Description

(No Model.)

J. RIDGE.

NOISELESS SLATE.

Patented June 5, 1883.

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' UNITED STATES PATENT OFFICE.

JOSEPH RIDGE,'OF CHICAGO, ILLINOIS.

NOISELESS SLATE.

SPECIFICATION forming part of Letters Patent No. 278,744, dated June 5, 1883. Application filed March 7, 1883. (No model.)

To all whom it may concern:

Be it known that I, JOSEPH RIDGE, of Chi cago, county of Cook, and State of Illinois, have invented new and useful Improvements in Noiseless Slates, of which the following is a full and complete description, reference being had to the accompanying drawings.

My invention relates to a method of muffling' slates, wherein the cloth or strip is so secured in the frame that a better cushion or more deadened effect is secured than by the usual method of drawing the cloth tightly on the frame or supplemental strip. My invention also relates to cheapening the operation of muffling and to giving the slate at neater appearance.

\Vith reference to the drawings, Figure 1 represents the slate with a portion broken away. Fig. 2 is a section of the frame before the muffler is applied. Fig. 3 is a cross-section of the finished slate through broken line, Fig. l; and Fig. 4 is an edge elevation.

A represents the slate proper. B is the frame. a represents notches or recesses along the outer margin of the frame. 0 represents the muffling-strip, of cloth or other pliable and noiseless material, and 1) represents keys or wedges.

As perhaps the best method of securing the keys in the notches, thelatter are dovetailed. The mufliing strip is somewhat greater in width than the thickness of the frame, and is drawn tightly around the outer surface of said frame, being forced at intervals into each notch or recess, where it is secured by keys I). The strip 0 being wider than the thickness of the frame, it is so adjusted thereon that its edges project on each side, forming a narrow pliable cushion or rib, by which the frame is protected from contact with the desk, and the consequent noise avoided. As the most rapid and easy manner of inserting the keys, the latter are made of strips of sheet metal coveredwith cloth and cut into proper size. They may then be curved and shortened, so they will enter the cor serpentine directions outside or narrowest part of the notch, and, be?

ing forced in on strip C, may be straightened by pressure and thus firmly secured, at the same time securing said strip 0.

Solid or inflexible keys may of course be driven into the notch at the side of the frame, the muffling-strip being first pressed down into the notch; or said strip 0 may be so cured in the notches in any other manner, the latter serving to secrete said fastenings and to prevent their contact with the disk.

It is evident that the muffling-strip being drawn tightly in circuitous or zigzag directions around the frame, and its central portion being secured as with the keys, the tension prevent-s the edges of said strip from being crushed or flattened down to remain so, but will stand out, forming the desirable cushion or support that renders the slate more noiseless than when the covering is drawn tightly and flatly on the frame.

The notches or recesses may of course be longer and located farther apart than relatively shown in the drawings, with substantially the same effect. The result of the series of notches with the strip c inserted is to give the frame a scalloped appearance, thus adding to its neatness.

Having thus fully tion, what I claim, and desire to secure by Letters Patent, is-

1. The slate-frame provided with notches or recesses around its outer surface, in combination with the muffling-strip G and keys I), or other fastening devices, substantially as and for the purpose specified.

2. In combination with a slate-frame, the band or ribbon like strip 0, secured in zigzag by removing sections of said frame and clamping said strip therein, substantially as and for the purpose set forth.

JOSEPH RIDGE. \Vitnesses:

Gno. B. KENYON, FRANK WARNER.

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