US31548A - Iid lindner - Google Patents

Description

E. LINDNER. GL01 B (EASTER.

Pdt'en'ted Feb. 26, 1861.

EDWARD LINDNER, OF NEW YORK, N. Y.

FURNITURE-(EASTER.

Specification of Letters PatentQNo.

To all whom 'it may concern:

Be it known that I, EDWARD LINDNER, of

the city, county, and State of New York,

have invented new and useful Improvements in Globe-Casters; and I hereby declare that the following is a full and clear will admit of the subsequent cooling and contraction.

description of the same, reference being had to the accompanying drawing, in which Figures 1, 2, 3, 4, 5, 6,7 and 8, represent Views in elevation, invention together with modifications of the same.

The nature of my invention consists in the peculiar construction of the globe containing socket and in the means employed to keep the globe within the socket whereby a cheaper and more durable article is \produced while a greater perfection of its operation is attained.

In Fig. l the socket is made solid with the screw that fastens it with the leg of the 7 table, chair or other furniture to which it is applied. The peculiarity of this socket consists in the formation of the concavity of the socket which is elliptical or oval or otherwise similarly shaped so that the plane of its greatest axis shall coincide with that of the globe, the socket at the same time being in tangential contact with the top of the globe. The opening ofthe socket at the under side thereof is circular of a diameter somewhat smaller than that of the globe.

To insert the globe within the socket, the latter is heated when, by its expansion it globe and imprison it by By this construction of the socket, the globe, when in operation, will have but one point of contact within the socket which is diametrically opposite to that without the socket.

In Fig. 2 the socket and the screw are distinct from each other and may be made of different materials according to the strength required and convenience of manufacture. The socket may be made of brass or other malleable material and is provided with hooks that may be bent inward after insertion of the globe within the socket.

' tical or oval the longer axis passing through The peculiarity in this caster consists in the oblong shape of its cavity it being ellipf "the opening in the top of the socket. In connection with this socket is used a round "headed screw so that the globe comes in contact with the head of the screw only.

The operation of this caster is similar to section and detail of myeaseejaatea February 26, 1861.

that of the former. For heavy furniture in which casters of greater strength are to be used, I construct the globe with recesses over its surface the object being to give it a greater hold on the floor by increasing its surface of contact. The socket is or maybe constructed in the same manner as the one hereinhcfore described with the exception of the screw, which in this case, instead of being convex shaped at the head is provided with a cavity corresponding more or less .with the convexity of the globe. It will. be

evident that the recessed portion of the globe has no bearing whateverm the socket,

while it affords an increased friotitmal.hold. c;-

on the fioor particularly when carpeted.

In Fig. 4 the socket is cast arouiul a screw having a flat steel head or a head hardened by temper. At a a depression is shown as applied to the shank of the screw whereby it is prevented from turning within the socket.

The globe which may be made of metal, steel, porcelain or glass bears against the head of the screw and has therefore but one point of contact. The cavity of the socket is moreover provided, in its u per portion, with a projecting rim which may he circular, oval, or polygonal, as shown in Figs. 5, 6, 7, which represent plan views of the cavity. The object of this rim is to facilitate theirotation of the ball or globe around its horizontal axis by applying a force erresistance created by friction on the one side of the globe only while at the same time the opposite side is left entirely fr and out of contact and thus acting on the hall with a,

leverage as it were to cause its rotation in any desired plane and thereby answering the conditions of a'caster in the most perfect manner.

It is evident from the above that the irim should be of such development or of such diameter as to allow the ball freely to play within. and to come in contact with the ball at one pointthereof when motion. is imparted to the piece of furniture that is provided with it.

The socket I prefer to make of two pieces so as to enable any one to remove the ball for the purpose of cleaning or to sul'wstitute therefor another and lastly to securely confine the ball within the socket. For this purposehooks or pins are cast to the upper half and angular slots are cut in the lower part of the socket or cap piece. This mode iii . Lea:

of fastening may be modified. and'constructed in different manners.

During the operation of this caster, dust, fibers of carpet etc. are carried along by the ball and produce the clogging up of the socket. To avoid this I cut a hole in the upper part of the socket and through it. By this means the dirt is worked out of the socket which is thereby preserved clean and perfection of its operation secured.

WVhen glass globes are used I prefer to remove the superficial glaze either by mechanical means 2'. c. by grinding them upon emery wheels or shaking the glass balls in drums containing emery or by chemical means 2'. e. by dlpping the balls in strong acid such as fluoric acid, in order to give more adhesion to the floor or carpet.

Having thus described my invention and several modifications thereof I shall confine the claims of this application to the followmg:

1. In a socket the concavity of which is fOiIilcCl of an elliptical oval or other equivalent form and the orifice or rimof which is of a diameter smaller than that of the globe, whereby the globe may be inserted w1th1n the socket by the application of heat substantially as described.

2. In combination with the studs or plns in the upper part of the socket, I claim the angular slot in the cap piece for the purposes described.

3. In con'ihination with a socket cast' in one piece with the screw or other appliance for fastening the caster to a piece of furniture, I claim. forming the concavlty of an elliptical oval or other equivalent form whereby the globe will have but one pomt of contact within the socket which is diametrically opposite to its point of contact with the floor.

In testimony whereof I have hereunto subscribed my name.

EDWARD LINDNER. Witnesses:

S. H. MAYN RD, JOHN R. PECKI-IAM.

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