An Improvement in Castors for Furniture and other Moveable Articles.
Year: 1890

page_text: Date of Application, 24th June, 1890
Complete Specification Left, 23rd Mar., 1891-Accepted. 13th June. 1891
PROVISIONAL SPECIFICATION.
An Improvement in Castors for Furniture and other Moveable
Articles.
ARTHUR MARMADUKE HART No. 15 Vicarage Park Plumstead in the County
of Kent Hardware Manufacturer and Agent, do hereby declare the nature of this
invention to be as follows:-
An improvement in construction of the upper or bearing part of the castor and
substituting for the part known as the home for holding the bowl or wheel a
cantilever cradle or cantilever crane holder to hold the bowl or wheel that by
distributing the weight by means of levers the weight or strain is thrown on the
bottom of a specially constructed bearing pin and doing away with the wear and
strain on the projecting home and further a wheel or roller is attached to
the cantilever cradle or crane and running on the cup or plate attached to the
furniture so that the wheel or roller comes direct under the centre of the axle or
spindle on which the bowl or wheel runs further assisting to adjust the strain.
The advantages I claim for this improvement It obviates any unequal wear
where the articles of furniture are frequently being moved and further it has all
the advantages of easy action by means of levers of the old home castor and equal
to a centeral action by means of the extra roller or wheel and economy of
manufacture and can be applied to articles of great weight.
Dated this 24th day of June 1890.
A. MARMADUKE HART.
COMPLETE SPECIFICATION.
An Improvement in Castors for Furniture and other Moveable
Articles.
ARTHUR MARMADUKE HART No. 15 Vicarage Park Plumstead in the County
of Kent Hardware Agent and Manufacturer 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 :-
My invention has reference to the home castor and those of similar construction
revolving round a centeral bearing pin for furniture or other moveable articles and
comprises an improvement in that part known as the home and substituting a
cantilever cradle or cantilever crane holder to hold the bowl or wheel and by
distributing or balancing the weight the strain is thrown upon the bottom of the
centeral bearing pin doing away with the unequal wear and strain of a projecting
home.
This construction will be readily understood by reference to the accompanying
drawings which is that the cradle forms an unequal sided triangle, pyramid or cone
the base being divided into unequal lengths by the central bearing pin the bowl
being at the apex slightly out of the centre the base by means of the cantilevers
forming a balance thus re-adjusted the strain.
And further on reference to the drawings it will be seen that the bowl is on the
opposite side to the elongated cantilevers which forms the principal leaverage by
means of which the resistance is overcome.
In the home castor the leverage for the turning power and the bowl are both on
the same side of the central bearing pin adding greatly to the side strain Fig. 1
and 3 Sheet 1. Fig. 6 Sheet 2 shows a wheel or friction roller attached to the
cradle and under the centre of the bowl of the castor all the patterns drawn can

page_text: be used with or without roller. I am aware that this has been used for home, and
other castor for many years but I only adopt it to my specilly constructed
castor..
..
.
i.. '
In the accompanying drawings my special cradle is attached to the ordinary
socket fittings but my cantilever cradle can be attached to all forms of castor
having a central bearing pin the ordinary bowl and bearing pin being shown the
cradle and bowl being attached in the ordinary way.
This invention will be more readily understood by reference to the accompanying
drawings.
Sheet Fig. represents side view of a cantilever cradle of a triangular
description having a wheel or roller under the bowl the back cantilevers being
joined to the top of the block in which the central pin runs.
Fig. 2 represents the same the leavers not being joined to the top of the block.
Fig. 3 represents a three quarter back view of the castor with front wheel. This
represents the end view of all the accompanying drawings subject to corresponding
alterations.
Fig. 4 represents a pyramid shaped cantilever castor with open block (side view)
for the central pin to run in.
Fig. 5 represents a curved pyramid shaped cantilever cradle.
Fig. 6 represents a front view applicable to all the patterns drawn with
thickning piece or washers inside the holders of the bowl at the apex to prevent
the bowl touching the sides of the cantilevers. This thickening or washer is on
the front legs only to prevent the bowl touching the back legs or cantilevers.
:
Figs. 7 and 8 represent a square cantilever cradle more particularly applicable
to stamped work. There are many varieties of these patterns to which this
principal hereinbefore described can be applied but these are sufficient to illustrate
the application.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed declare that my
claim is.
1. The application of the cantilever or balance principle to the construction of
the cradle or crane for holding the bowl of the castor.
2. That this mode of construction enables the bowl to be placed more over the
centre of the bearing pin doing away with excessive leaverage without interfering
with the power of revolution.
3. That this mode of construction re-adjusts any side strain and makes the
action more equal to the bowl being in the center of the bearing pin.
P
4. That this mode of construction equalizes the wear and tear by doing away
with excessive leverage.
DLL...
1001
A. MARMADUKE HART.