Improvements in Casters.
Year: 1889

page_text: Date of Application, 7th Dec., 1889
Complete Specification Left, 8th Sept., 1890-Accepted, 1st Nov., 1890
Improvements in Casters.
I, THOMAS WILLIAM LAMBERT PHILLIPPS, of Picton Hall, Broadway, in the County
of Worcester, Gentleman, do hereby declare the nature of this invention to be as
follows:
This invention relates to the construction and arrangement of the parts constituting
casters for furniture, and other similar purposes, wherein antifriction balls are
employed to lessen the friction between the upper part of the horns bracket, and the
underside of the socket, and its object is primarily, to provide that the said balls
shall revolve or roll against an angular shoulder, instead of running in a deep groove
or channel as at present; also to provide that there shall be one, or two, concentric
rings of these antifriction balls, in combination with these improved shoulders or
supports; also that there may be these two concentric rings of balls in combination
with a groove formed by semi grooves, one being formed in the socket base, and the
other in the upper part of the horns bracket.
In constructing a caster according to this my invention, I may proceed somewhat
as follows: The upper part of the horns bracket is formed into a circular plate,
upon the top side.of.which, is provided an annular ring of a depth a little less than
the diameter of the antifriction balls to be used. The outer diameter of the plate
extends beyond the outer diameter of the annular ring, for a distance somewhat more
than the diameter of the balls, so that there may be a slightly raised portion at its
outer surface, forming as it were a very shallow recess in which the balls are placed.
The purpose of this is, that when the castor is being put together, this raised rim
will keep the balls in their place, while the bracket is being passed into its position.
.Again. Upon the underside of the socket, or plate, is formed an annular recess,
(or as will be readily seen, this recess, if desired, may be in the horns bracket, and
the annular ring in the socket or plate) equal in depth about, to the depth of the
aforesaid annular, ring.
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The outer diameter of this recess is such as to permit of a ring of balls being
placed between it and the outer diameter of the ring, while its inner diameter is such
as to permit of a ring of balls being placed between it and the inner diameter of
the said ring.
The horns plate is connected to the socket &c., by means of a shell or ring of
metal, having its upper part rolled or spun into.a groove upon the socket base, or the
plate, and its lower edge rolled or turned underneath the horns plate, but in such a
manner, that the latter shall be free to rotate. Or the outer diameter of the base of
the socket &c., may be screwthreaded so as to receive a screwed cap, or, in some cases,
a central pin may be formed upon the horns plate, which shall pass upwards through
and to the interior of the socket, or the upperside of the plate; and there secured
by a washer and pin, or their, equivalent.
Or the said pin may be upon the socket or the plate; and pass through to the
underside of the horns plate, and similarly secured.
Instead of these shoulders, being, formed in the manner heforementioned, I may
forin-in each plate and opposite to each other, two sets of grooves, of a little less
than half the diameter of the balls in depth, and in these semi grooves, places the
two concentric rings of balls as before described.
The roller centre or fulcrum in the horns, is within the circle of the outer circular
ring of balls, so that the weight of the furniture &c., is in a direct vertical line upon
the said roller pin.
Dated this 6th day of December 1889.
CHARLES T. POWELL,
Applicant's Agent.

page_text: COMPLETE SPECIFICATION.
Improvements in Casters.
I THOMAS WILLIAM LAMBERT PHILLIPPS, Picton Hall, Broadway, Worcester
Gentleman do hereby declare the nature of this invention and in what m
the same is to be performed, to be particularly described and ascertained n
by the following statement:-
The caster is in three or more paits not including balls in bearing, which may be
of any number. The top chair B. has a circular half groove on its under side,
which covers one third or more of balls in bearing D. D., and the bottom chair C.
has a circular half groove directly under and opposite-and covering horizontally,
like the top groove one third or more of the balls in bearing D. D. Both grooves
holding and covering balls in bearing D. D.-may be of the same shape as those
in Fig. 1 or L. M. N. or a composition of the same.
The direct weight and strain is central with the castor or balls in bearing D. D.-
and central on the roller G. The roller G. is secured with, and runs on pin H.
riveted or pressed in two luggs P. P. which are cast on the underside of bottom
chair C. The whole of the roller G it will be observed, is vertically within the
circular line of the centres of the balls D; and its own centre (roller G) being
vertically slightly out of line with the said circular ring of balls D, affords the
necessary eccentricity to allow the roller G to run in any direction. The bottom
chair C is secured to the top B by rivetted pin screw and nut, or pin and washer,
either from underneath the chair C, or in top chair B. The pin R in no instance,
takes the bearing strain or weight from any part of the castor, and does not touch the
sides of the top chair B. The lower chair Cis kept in place laterally, by the balls D
in their bearing. There is a space between top and bottom chairs B and C ; the
said chairs not touching each other at any part. The top chair B has a flange K on
its outer edge, partly covering the bottom chair; and is cast with top chair B, or
secured separately thereto. It will be further seen that by this arrangement, a
considerable portion of the upper part of the roller G is carried within or covered
by the dome shaped bottom chair C.
This said castor is designed to be applied to all kinds of socket, plate, screwtop,
pivot, or other forms.
Having now particularly described and ascertained the nature of this my said
invention, and in what manner the same is to be performed, I declare that what
I claim is
1. Half grooves in top and bottom chairs B & C.
2. Nonfrictional and nonbearing central pin or stud R.
3. Mode of securing bottom to top chair without bearing.
4. Direct and central weight on roller G.
5. Roller G being in every part of its outer edge vertically within the circle of
balls in bearing D, D.
6. Sole strain and weight being on balls in bearing D, D.
7. Dome in bottom chair C partly covering roller G.
To thi th
1000