US22751A - Ball furniture-caster - Google Patents

Description

UNITED STATES PiXTENT OFFICE.

B. A. RUSSELL, OF DEEP RIVER, CONNECTICUT.

BALL FURNITURE-(EASTER.

Specification of Letters Patent No. 22,751, dated January 25, 18-59.

To all whom it may concern:

Be it known that I, B. A. RUSSELL, of Deep Ilivcr, in the county of Middlesex and State of Connecticut, have invented a new and useful Improvement in Ball-Casters; and I do hereby declare that the following is a full, clear, and exact description of the same. reference being had to the annexed drawings, making part of this specificatig" Figure 1, is a vertical section of the" nproved caster applied to a table icy" Fig. 2, is a horizontal section of ditto ,ne line 1,1, of Fig. 1. J

Similar letters in the figures refer to our responding parts.

The nature of this invention consists in a. new article of manufacture of casters in lessening the friction of the ball in the easing inclosing the upper portion of the same, by causing its bearing surfaces to be con fined to the surface of a horizontal plate at its upper part, on which the weight of the table or other article of furniture to which it is attached, rests, and to the ends or points of a series of horizontal set screws, or vertical ribs inserted radially in the casing on a line with the axis of the ball, at its sides.

To enable others skilled in the art to make and use my invention I will proceed to de scribe its construction and character.

The metallic casing, or cylinder A, is made to fit over the end of the leg B, of a table or other article of furniture, and secured thereto in the ordinary manner, and is contracted.

near its lower end so as to form an inclined ridge C. around its inner periphery, on which a circular plate D, of hardened steel or cast iron beneath the leg B, rests, and its extreme lower end is provided with a small rim E. whose inner circular edge is of less diameter than the ball F, so as to prevent the said ball coming out of the lower end of the casing A, after being inserted therein from the upper part. A series of radial screws G, are inserted in corresponding openings in the periphery of the casing A,

innncdiately above the rim E, which screws extend through the casing on a line with the axis of the ball, and are made smooth on their inner ends, where they come in contact with the ball, so as to present a slight and smooth surface to the spherical surface f the sides of the ball, and therebv confine .ne side hearing or friction occasioned by rolling the article of furniture on the caster over the floor, exclusively to these points, and to a slight central bearing surface on the under side of the hardened steel or cast iron plate D, against which the upper spherical ridge of the ball is in contact. I use the screws G, whcn the casing or cylindcr is made of brass, and when made of cast iron, I chill the ribs G, or smooth surface, to prevent wear, or in case I prefer to insert a chilled cylinder. either with or without the ribs (ir', inside of the lower end of the c vlinder A when made of brass. By thus confining the ball between these points, whose aggregate bearing surfaces will be but slight, when compared to the large surface usually borne upon by the upper parts and sides of ball casters, the friction heretofore experienced in moving the article of furniture to which the caster is attached, will be materially lessened. In the event, moreover, of the ball becoming loose in the socket, thus formed for it. from constant wear, the screws can be turned and their ends always adjusted to its sides.

lVhat I claim as new and desire to secure by Letters Patent, is-

As a new article of manufacture in my innn'oved furniture caster, when composed of cylinder or casing A, either with or without. the radial set screws G. or ribs G, in combination with the plate D, and ball F, when constructed arranged and operated in the manner and for the purposes set forth.

B. A. RUSSELL.

Vlitncsses N. A. STARKEY, H. G. LooMIS.

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