Year: 1887

page_text: Date of Application, 19th Feb., 1887
Complete Left, 1st Dec., 1887
Complete Accepted, 6th Jan., 1888
I, GEORGE WILSON HEATH, Director of and on behalf of The Patent Ball Castor
Company, Limited, of 28, Fenchurch Street, in the City of London, do hereby
declare the nature of this Invention, to be as follows:-
:-
According to this invention I greatly improve the construction of ball-castors as
heretofore made all as hereinafter described. I provide a hard metal ball at the top
of the hard metal runner ball to form a bearing for it at that place, and I provide
three or more hard metal rollers at a distance between the top of the runner ball and
its centre to form a bearing for the runner ball at that place. The aforesaid friction
ball and friction rollers are all mounted in a hard metal fitting or socket which is
placed inside the body of the castor.
The runner ball and its bearings and the bearing socket are by preference made of
chilled cast iron. Or the friction ball may be placed in a cup separate from a ring in
which the rollers are mounted.
I prefer to let the friction ball have its bearing against a point or small surface at
the top and a narrow rim lower down, and I prefer to mount the friction rollers on
pins. Instead of the friction ball I may use a point or knob or small ring, and instead
of the friction rollers I may use balls or points or flats as bearings for the
runner ball.
In order to render the action more noiseless I provide a band or lining of India-
rubber or felt or other yielding or elastic material between the bearing fitting and the
interior of the body of the castor. The latter is provided with a screwed ring cap for
holding the interior parts of the castor in place. By the use of the aforesaid interior
socket forming the bearings for the friction balls and rollers (or equivalent parts) I
am enabled to employ a special hard metal such as chilled cast iron which as against
brass, of which the body of the castor is made and in which heretofore the bearings
of ball castors were formed, possesses the advantages of reduced wear and tear. Also
by the use of the intermediate India rubber ring or lining I render the action softer
and more noiseloss.
Dated this 19th day of February 1887.
GEORGE WILSON HEATH.
By Jensen & Son,
77, Chancery Lane, London, W.C.,
Patent Agents.

page_text: Improvements in Ball Castors.
I, GEORGE WILSON HEATH director of and on behalf of the Patent Ball Castor
Company Limited of 28 Fenchurch Street in the City of London 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 :-
According to this invention I greatly improve the construction of ball castors as
heretofore made, all as hereinafter described.
My invention will be fully understood by reference to the accompanying drawings.
As shown in the vertical section figure 1 and the underside plan figure 2 I provide
at the top of the hard metal runner ball A a hard metal friction ball B to form a
bearing for the runner ball at that place, and I provide three or more (in this case
four) hard metal rollers C at a distance between the top of the runner ball A and its
centre to form a bearing for the runner ball at that place. The aforesaid friction
ball B and friction rollers C are all mounted in a hard metal fitting or socket D which
is placed inside the body E of the castor.
The runner ball A and its bearings B and C and socket D are, by preference made
of chilled cast iron.
In the vertical section figure 3 and underside plan figure 4 I have shown a
modification in which the friction ball B is placed in a cup D separate from a
ring D¹ in which latter the rollers C are mounted and which is here shown with a thin
flange that fits in a recess in the cup D.
As shown in the preceding figures I prefer to let the friction ball B have its bearing
against a point or small surface at the top and a narrow rim lower down; and I prefer
to mount the friction rollers C on pins.
Instead of the friction ball C I may as shown in figures 5 and 6 use a point
or knob B in the centre of the cup D against which the top of the runner ball A
works.
Or as shown in figures 7 and 8 the runner ball A works at the top against a
ring B.
Or as shown in figures 9 and 10 I cause the runner ball A to work against a
ring B at the top and against points C or flats at the sides as bearings for the runner
ball A.
Figure 11 shows a castor similar to that in figure 5 but with a ball B instead of the
point B.
Obviously I may substitute points or flats C for the rollers C, and a ring B for the
ball or point B.
In order to render the action more noiseless, I provide a band or lining F, shown
in all the figures, of india rubber, or felt, or other yielding or elastic material between
the bearing fitting D, and the interior of the castor body E. The latter is provided
with a screwed cap G for holding the interior parts of the castor in place.
By the use of the aforesaid interior socket D forming the bearings for the friction

page_text: balls B and rollers C (or equivalent parts) I am enabled to employ a special hard
metal, such as chilled cast iron which as compared with brass, of which the body E is
made, and in which heretofore the bearings of ball castors, were formed, possesses
advantages of reduced wear and tear. Also by the use of the intermediate India-
rubber ring or lining F I render the action softer and more noiseless.
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 :
The improved ball castor consisting of a hard metal runner ball A which at the top
works against a hard metal friction ball B or equivalent and against three or more hard
metal balls C or equivalents situated in a plane between the top of the runner ball
and its centre, the said friction ball B or equivalent and the said balls C (or equivalent
parts) being mounted or provided in a suitably shaped socket D which is placed in
the body of the castor with an intermediate ring or lining F of India rubber or other
suitable elastic or yielding material, the aforesaid interior parts of the castor being
retained in the body of the castor by a cap ring G and the whole being constructed
substantially as shown on the drawings.
Dated this 1st day of December 1887