US833453A - Caster. - Google Patents

Description

No, 333,453. PATENTED OCT. 16, 1906. A. A. FISHER.

GASTER.

APPLICATION FILED SEPT. '1. 1305.

Q J I '3 t atko'cnug s.

AUSTIN A. FISHER, OF ALLENTOWN, PENNSYLVANIA.

CASTER.

Specification of Letters Patent.

Patented Oct. 16, 1906.

Application filed September '7, 1905. Serial No. 277,350.

-T0 a. whom it may cancer-7t:

Be it known that I, AUSTIN A. FIsHER', a citizen of the United States, residing at Allentown, in the county of Lehigh, State of Pennsylvania, have invented a new and use ful Caster, of which the following is a specification.

My invention. consists of a caster constructed of a ball-roller and a skeleton frame adapted to freely contain the same and prevent displacement thereof and provide the proper bearings for said ball with the least Fig. 7 represents a top view of the form shown in Fig. 5.

Similar letters of reference indicate corresponding parts in the figures.

Referring to the drawings, A designates a ball-roller, and B designates a frame, which contains the upper portion C of the said ball, said frame consisting of the top plate D, the

arms E, depending therefrom, the ring F,

which connects said arms at the lower ends thereof, and the inturned lips G, which depend from said ring and freely encircle said ball below the equatorial line thereof, and thus prevent the same from dropping from said frame B, it being noticed that said arms are equally spaced apart, and their inner faces are continuous coincident curves, as are also those of the lips, to conform to the curvature of the ball which in its motions has free bearings on said faces, and the spaces between the arms prevent lodgment of dirt in the frame, the arms also acting as scrapers to clear the surface of the ball of anything that may be taken up by the same. Furthermore, the ring F forms strong connections for the arms and prevents the same from being spread and opening, the frame in its entirety being light, durable, and inexpensive, the members D E F G thereof being inte ral, while the members or lips G, which are s ort in length, retain the ball in position with the least friction thereon, the curvatures of the inner faces of said lips being continuities of those of the members or arms E.

In Figs. 1, 2, 5, and 7 I show a screwthreaded spindle H, which rises from the plate D and is adapted to be driven into the leg of a chair, table, &c., in order to retain the caster in position. The upper end of the spindle H is cut away, forming a plurality of faces J, forming a series of angles, and leaving the entering portion substantially triangular, as seen best in Figs. 2 and 7. These angles are screw-threaded, whereby the spindle may readily cut into the wood, and thus easily penetrate the same.

In Figs. 3 and 6 the plate D has openings shown in dotted lines to receive fastening- The plate is circular in Figs. 1, 2, 3, 4, and 6 and triangular in Figs. 5 and 7, without producing different results in either case;

but the spindle is a preferred form of fastening device, as its tapering end presents cutting edges which work against the wood in a manner that is evident.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

A caster consisting of a horizontal top plate having spaced arms depending therefrom, an annu ar ring connecting said arms near their lower ends, inturned lips forming continuities of said arms below the ring, and a ball-roller within said arms, ring and lips, said lips conforming to the curvature of the ball and engaging the same below and in proximity to its horizontal aXis and the bearing faces of said arms being continuities of curves coincident one with the other and with said lips.

AUSTIN A. FISHER. Witnesses:

CHAS. H. SoHAN'rz, CYRUS A. FISHER.

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