Improvements in Castors.
Year: 1891

page_text: Date of Application, 17th Aug., 1891
Complete Specification Left, 11th May, 1892-Accepted, 17th Aug., 1892
PROVISIONAL SPECIFICATION.
Improvements in Castors.
I, JAMES FREYBERG of 59 Weltje Road, Hammersmith in the County of
Middlesex, Auctioneer and Surveyor, do hereby declare the nature of this invention
to be as follows:-
My invention relates to improvements in castors whereby to afford greater
freedom of adjustment in the circular direction and prevent undue strain and
wear upon the pivotal centre and its bearing, and the improvements consist
essentially in the application of ball bearings as hereafter described to the pivotal
centre, and in the construction and arrangement of the parts hereafter described.
Instead of the horn in which the castor wheel is mounted turning about a
stationary centre pin passing through it, it is made in one with a screw stud to
which a cupped head is affixed, this head having an external, circumferential, half
round groove, to which corresponds a similar internal groove in an outer spherical
casing, and in these coinciding grooves run a set of antifriction balls of steel which
take the lateral pressure due to the overhang of the castor. The groove in the
casing is the deeper and means are provided for readily introducing the balls singly
and preventing them falling out on taking the castor to pieces.
In this revolving cupped head is received a main bearing ball which is interposed
between said cupped head and the upper part of the spherical casing, and which takes
the vertical pressure due to the weight. The spherical casing is made in halves
screwed together and the upper part is in one with the socket or plate to be attached
to the article of furniture.
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1001
J. FREYBERG,
By A. M. & Wm. Clark,
53, Chancery Lane, London, Patent Agents.
COMPLETE SPECIFICATION.
Improvements in Castors.
I, JAMES FREYBERG, of Percival Street, Wellington, New Zealand, late of
59 Weltje Road, Hammersmith in the County of Middlesex, Auctioneer and
Surveyor and General Business Agent, do hereby declare the nature of this
invention and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement, reference being had
to the accompanying drawings and to the letters and figures marked thereon, that
is to say:
This invention relates to improvements in castors, whereby a stronger construction
is obtained and the furniture to which the castors are applied can be more easily
shifted from place to place.
In order that my invention may be fully understood and readily carried into
effect, I will describe the drawings hereunto annexed, which illustrate my improved
castor.
Fig. 1 is an elevation, and Fig. 2 is a vertical section of the castor.
Fig. 3 shows the parts separated from each other so that the construction may
be more clearly seen.
a is the horn to which the bowl a¹ is connected as usual. According to my
invention I form the horn in a solid piece with a screw-threaded stem, pin, or
stud a, thereby dispensing with the ordinary rivetted pin which is at present
FDQ77

page_text: employed in other castors, and which is a source of great inconvenience, by reason
of its rendering the horn liable to become loose or detached. The screw-threaded
stem, pin, or stud a³ is screwed into an inner conical cup b, which is tapped to
receive it, and this cup receives an antifriction ball c. Surrounding the inner cup b
is an outer cup or socket d which is formed with a shoulder d' and screw-threaded
at d², so as to enable it to be connected to the upper socket e, which is formed
with a corresponding shoulder e'.
The interior surface of the outer cup or socket d, is tapered or conically formed
to receive the inner cup b, which, as seen in Fig. 2, has a conical exterior, and is
formed with rounded shoulders ¹. When the cup is in place the rounded
shoulders come into contact with the tapered interior surface of the socket d,
and prevent the said inner cup from becoming detached from the outer cup, but at
the same time allowing, by reason of the shape of these parts band d, a slight
amount of vertical play. Therefore, when the parts of the castor are fitted
together, the weight of the piece of furniture, to which the castors are attached,
causes the sockets and e, which, when screwed together, constitute one piece, to
descend slightly, thereby bringing the interior surface of the outer cup or socket d
out of contact with the inner cup 6 (Fig. 2) and thus allowing the entire weight of
the piece of furniture to be borne on the antifriction ball c. Consequently, when
the piece of furniture is shifted, the bowl a' readily places itself in a line with the
direction of movement, and therefore enables the piece of furniture to be very
easily moved.
Although I have described and shown a castor suitable for heavy furniture, this
construction of castor may be formed of lighter metal by stamping up in suitable
machinery.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what
I claim is
1. The improved construction of castor consisting of an inner conical cup, to
which the horn connected, and of an outer socket formed in two portions, the
lower of which is tapered or conical on its interior, and the upper of which is fixed
to the piece of furniture, said cup and socket being arranged to receive and enclose
an antifriction ball in such a manner that the entire weight of the piece of
furniture is supported on the ball, substantially as described.
2. Constructing the horn of the castor with a stem, pin, or stud which is formed
in one piece therewith and is adapted to be screwed into the conical inner cup,
substantially as described and for the purpose set forth.
3. The improved castor having its parts arranged and combined to operate
substantially as described and shown, and for the purposes set forth.
Dated this 10th day of May 1892.
ERNEST DE PASS,
Chartered Patent Agent,
78, Fleet Street, London, and 6, Victoria Street, Nottingham,
Agent for the Applicant.