Improvements in Furniture Castors.
Year: 1893

page_text: Date of Application, 29th Apr., 1893
Complete Specification Left, 29th Jan., 1894-Accepted, 14th Apr., 1894'
Improvements in Furniture Castors.
J MAURICE LACHMAN of St. George's Club, Hanover Square, in the County
of London, Gentleman, do hereby declare the nature of this invention to be as
follows:-
The object of this invention is to simplify the construction of castors, to ensure
the fixing of the parts in their proper relative positions, and otherwise to improve
the working of the same.
In carrying out this invention, the pivot pin of the castor is provided with a disc
in the usual way; the lower end of the pin is coned out for a purpose to be presently
explained.
On the pivot pin is mounted a sleeve having an external shoulder at its outer
end, the inner edge being slightly coned.
On the sleeve is mounted the runner frame, and above the runner frame is
mounted a loose disc having a downwardly projecting annular rim. This disc is
also slotted or recessed to receive small rollers, which, when the sleeve is placed in
position on the pivot pin, will lie between the pivot pin disc and the runner frame,
and form a roller bearing to the latter.
When the sleeve is placed on the pivot pin, the parts are placed in a suitable
support, and a punch is caused to descend into the coned end of the pin, and
spread it out into the coned portion of the sleeve, and rivet the parts together.
It will thus be seen that the sleeve will definitely ensure the proper relative
positions of the parts, to provide for easy working.
The rollers employed have parallel sides, and the slots in the disc are slightly
rounded.
Dated this 29th day of April 1893.
NEWTON & SON,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Furniture Castors.
I, MAURICE LACHMAN of St. George's Club, Hanover Square, in the County
of London, Gentleman, 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 :-
The object of this invention is to simplify the construction of castors, ensure the
fixing of the parts in their proper relative positions, and otherwise to improve the
working of the same.
In carrying out this invention, the pivot pin of the castor is provided with a disc
or its equivalent. The lower end of the pin is coned out, for a purpose to be
presently explained.
On the pivot pin is mounted a sleeve having an external flange at one end, the
inner edge at the same end being slightly coned or countersunk.
On the sleeve is mounted the runner fraine, and above the runner frame is
mounted a loose annular disc or plate, having flanges on its inner and outer edges
projecting in opposite directions. This disc or plate is slotted or recessed to receive
D017

page_text: small rollers, which, when the sleeve is placed in position on the pivot pin, will
lie between the socket and the runner frame, and form a roller bearing to the
latter.
:
When the sleeve is placed on the pivot pin, the parts are placed in a suitable
support, and a punch is caused to descend into the coned end of the pin, spread
it out into the countersunk portion of the sleeve, and thus rivet the parts
together.
'
It will thus be seen that the sleeve will definitely ensure the proper relative
positions of the parts to provide for easy working.
The rollers employed are cylindrical, and the slots in the disc may be slightly
rounded.
In the accompanying drawing,
Fig. 1 is a side elevation of a castor constructed according to my invention;
Fig. 2 is an elevation at right angles to Fig. 1.
Fig. 3 is a partial sectional elevation.
Fig 4 is a side view of another form of castor with my invention applied.
Figs. 5, and Figs. 6, are details which will be subsequently referred to.
A is the socket or fixing plate, and B is the wheel frame. C is the pivot pin.
D is the wheel. E are cylindrical rollers placed between the socket A and the
frame B, to reduce friction, and G is a recessed guide plate to hold the rollers in
their proper position.
Figs. 5 shew in section and end view the pivot sleeve F. Figs. 6 shew the form
of the recessed guide plate G, in under side plan view and section.
This guide plate is formed of an annular disc or plate, with the inner and outer
edges turned in opposite directions, to form flanges, and with recesses for the
cylindrical rollers. The depth of the flanges is such, that the plate will exactly fit
in between the socket A and the frame B, when the parts are together and it is free
to rotate on the pivot.
In putting the parts together, the sleeve F is first inserted from the underside in
the hole of the frame B; the plate G is then placed on the sleeve, with the larger
diameter flange downwards, and the rollers are inserted in position. The socket is
then placed in position, and the pivot pin is introduced from above; or the operation
may be reversed. When the parts are thus assembled, they are placed in a press,
in an inverted position, and the end of the pivot is spread out, so as to rivet the
parts together.
In the position shown at Fig. 3, the guide plate rests on the frame B, and
prevents the collection of dust and dirt on the running surface for the rollers,
which would interfere with the proper working of the same.
By the use of the flanged sleeve, it will be seen that during the manufacture the
proper distance between the socket A and the frame B will always be ensured
automatically.
•
This sleeve also gives a broad bearing for the plate A and roller frame B, and
prevents the pin with the strain from tearing out of the socket or plate, which,
being of comparatively thin metal, the pin is likely to do, unless the plate is
re-enforced by the sleeve.
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 :-
11
1. The improvements in furniture castors substantially as herein shewn and
described.
2. The use of a flanged sleeve to automatically gauge the distance between the
socket A and the frame B, and for preventing the pivot pin tearing away from the
castor during usage, as shown and described.
3. The use of a double flanged guide plate turning loose on the pivot, and having
the flange of larger diameter downwards, so as to prevent the collection of dust or
dirt on the running surfaces for the rollers.

page_text: 4. The combination with a castor provided with auti-friction rollers, of a sleeve.
to automatically gauge the distance between the socket A and frame B, and a
double flanged guide plate for the rollers arranged with the larger diameter down-
wards, to prevent the collection of dirt on the running surface for the rollers, as
herein set forth.
D
ليمن
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1004
NEWTON & SON,
Agents for the Applicant..