USD27183S - Design for a sprocket-wheel and chain guard - Google Patents

Description

DESIGN.

A. W. RIVETT. H SPROGKET WHEEL AND CHAIN GUARD.

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UNITED STATES PATENT OFFICE.

ARTHUR \V. RIVETT, OF CHICAGO, ILLINOIS, ASSIGNOR TO J. J. RYAN & CO., OF SAME PLACE.

DESIGN FOR A SPROCKET-WHEEL AND CHAIN GUARD.

SPECIFICATION forming part of Design No. 27,183, dated June 8, 1897.

Application filed April 24, 1897. $erial No. 633,815. Term of patent 8- years.

1'0 ctZZ whom it may concern:

Be it known that I, ARTHUR IV. RIVETT, of Chicago, in the county of Cook and State of Illinois, have invented and produced a certain new and useful Design for Chain and Sprocket-W'heel Guards for Bicycles, of which the following is a specification.

Referring to the accompanying drawings, Figure 1 illustrates a chain and sprocketwheel guard embodying my design, as seen in side elevation. Fig. 2 is a transverse vertical sectional view of the same, taken on line 2 2 of Fig. l and looking toward the rear end of the guard.

The design comprises among its essential features an outer rim or open frame A of generally oblong shape and wider at one end than at the other, the front end a, which is the wider, being formed on a true circle (to conform to the periphery of the driving sprocket-wheel of the bicycle) and the side margins a a being straight and arranged to converge from front to rear of the guard. The rear end a of the frame is formed at right angles to the longitudinal axis of the guard, the corners formed at the juncture of the side and end framepieces being rounded, as indicated at w, so as to present a smooth and graceful outline devoid of projecting angles. In order to enhance the appearance of the device, the said outer frame or rim A is made curved in cross-section, the outside face being convex and so formed that the extreme inner margins a of the rim will stand in the same plane with the vertical outer face of the guard, and the rim will curve or roll from said inner margin outwardly and toward the back side of the guard in a smooth curve, as best indicated in section Fig. 2.

The rim is provided at its outer margin with an instandin g flange A, having substantially the same curvature as and formed in continuation with the curve of the rim in cross-section, said flange being arranged to extend practically the full length of the upper side of the frame, around the circular front end thereof, and a short distance along the lower side, as indicated clearly in Fig. 1.

The depth-of this flange is such as to completely overlie the sprocket and chain when the guard is in position upon the wheel. The skeleton frame thus formed is partially filled in with open-work of ornamental pattern,

which also forms an essential feature of the design. A circular opening a, of considerably smaller diameter than the interior diameter of the larger end of the guard, is formed concentrically within said circular end, said opening being bounded or outlined by a smooth and continuous narrow ring A A designates a ring-segment formed upon the same diameter with and arranged in continuation of the inner margin of the circular front end of the outer frame concentrically with the ring A thus forming an annular space of uniform width between said inner ring and the ring-segment and inner margin of the front end of the guard. The space between said outer and inner ring is occupied by open-work of geometrical pattern, consisting of two alternated and contiguous designs,

one being an open circle a with a quatrefoil a arranged therein, and the other consisting of a diamond-shaped figure composed of two triangles a", having concave sides and arranged base to base, thus leaving an elliptical opening (4 between them, Within which is arranged a small open ring a. The longer axes of the elliptical openings are arranged radially with reference to the circular opening of the guard, and the diamond-shaped figure is distorted or curved sufficiently as a whole to enable the points at the longer axis thereof to meet the circles a at points central of the width of the annular space.

From the rear side of the ring-segment A a series of ogee-shaped scrolls extends along each side of the guard to the rear end thereof, the first pair of said scrolls a being of sufficient Width and so shaped at their front end portions as to meet each other at the cen ter of the guard immediately in the rear of the ring and the succeeding scrolls e a being of graduallydiminishing size front to rear, so as to leave a substantially oblong rectangular opening a extending from the rear end of the guard forwardly along the median line of the latter throughout approximately one-half the length of the guard.

I claim- The design for a chain and sprocket-Wheel guard for bicycles substantially as herein shown and described.

In testimony that I claim the foregoing as my invention I affix my signature, in presence of two subscribing Witnesses, this 22d day of April, A. D. 1897.

ARTHUR W'. RIVETT.

Witnesses:

J. HALPENNY, WILLIs D. SHAFER.

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