Improvements in Hollow Rollers, Wheels, or the like.
Year: 1892

page_text: Date of Application, 17th June, 1892
Complete Specification Left, 17th Mar., 1893-Accepted, 22nd Apr., 1893
PROVISIONAL SPECIFICATION.
Improvements in Hollow Rollers, Wheels, or the like.
I, ERNEST GUSTAV HOFFMANN of 5 Clarendon Villas, Beaconsfield Road, New
Southgate in the County of Middlesex, Engineer, do hereby declare the nature of
this invention to be as follows:-
This invention relates to the production of hollow wheels or rollers adapted
among other uses for furniture castors. It has heretofore been proposed to make
such wheels by stamping up in separate parts or halves upon which shoulders or
recesses are formed, generally by turning in a lathe and then securing the parts so
made, by brazing or soldering.
According to this invention the necessity for lathe work and soldering is obviated,
and a strong roller or wheel can be produced with much less thickness of shell
than is usually deemed necessary, thus effecting a considerable economy where
such shell is formed of brass or other expensive metal.
The wheels are formed in halves or parts by stamping up from sheets or discs,
the dies being so formed that the material near the edges to be joined has an
indentation or bevel groove around its internal face, preferably leaving the part
outside of said groove as a species of wedge shaped piece. The two halves so formed
may be held together by an internal ring provided with a groove or V shaped
depression upon its periphery corresponding to the two bevel or wedge shaped parts
when the halves are brought together. The internal ring and the separate halves
being placed together are then forced through a die which will compress the
intended rolling surface toward the centre and cause the halves to be firmly held
by the internal ring which must of course be of such a material as will retain its
resiliency.
The roller or wheel may be very considerably strengthened by substituting for
the simple internal ring two conically shaped discs provided with interlocking teeth
so shaped as to engage with the groove on the shell opposite to the location of the
disc. The top of the conical disc is stamped out so as to support the axle or shaft
bearing, and the teeth on each disc are supported by the opposite disc. The parts
being assembled the wheel is forced through the die as before described.
Dated this 17th day of June 1892.
PHILIP M. JUSTICE, Fel. Chart. Inst. P.A.,
55 & 56, Chancery Lane, London, Applicant's Agent.
COMPLETE SPECIFICATION.
Improvements in Hollow Rollers, Wheels, or the like.
I, ERNEST GUSTAV HOFFMANN, formerly of 5 Clarendon Villas, Beaconsfield
Road, New Southgate in the County of Middlesex, Engineer, but at present of
605 and 607 West 36th Street, New York, United States of America, 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 :-
This invention relates to the production of hollow rollers, wheels or like articles
such as pulleys, though it is particularly adapted for the production of rollers for
furniture castors.
It has heretofore been proposed to make such rollers or wheels
by stamping up in separate parts or halves upon which shoulders or recesses are
formed, generally by turning in a lathe and then securing the parts so made, by.
brazing or soldering.

page_text: According to this invention the necessity for latbe work and soldering is obviated,
and a strong roller or wheel can be produced with much less thickness of shell
than is usually deemed necessary, thus effecting a considerable economy where
such shell is formed of brass or other expensive metal.
The wheels are formed in halves or parts by stamping up from sheets or discs,
the dies being so formed that the material near the edges to be joined has an
indentation or bevel groove around its internal face, preferably leaving the part
outside of said groove as a species of wedge shaped piece. The two halves so
formed may be held together by an internal ring provided with a groove or
V shaped depression upon its periphery corresponding to the two bevel or wedge
shaped parts when the halves are brought together. The internal ring and the
separate halves being placed together are then forced through a die which will
compress the intended rolling surface toward the centre and cause the halves to be
firmly held by the internal ring which must of course be of such a material as will
retain its resiliency.
The roller or wheel may be very considerably strengthened by substituting for
the simple internal ring two conically shaped discs provided with interlocking
teeth so shaped as to engage with the groove on the shell opposite to the location
of the disc. The top of the conical disc is stamped out so as to support the axle
or shaft bearing, and the teeth on each disc, are supported by the opposite disc.
The parts being assembled the wheel is forced through the die as before described.
To clearly explain my invention reference is made to the accompanying drawing
in which
Fig. 1 represents one half of a roller or wheel as it is left after stamping.
Fig. 2 shows two halves put together and compressed upon an internal
strengthening ring or disc.
Fig. 3 is a similar view to Fig. 2 but showing two conically shaped strengthening
discs.
Fig. 4 is a face view with one of the halves removed.
Fig. 5 shows a modification of Fig. 3 and
Fig. 6 a similar face view of Fig. 5.
Referring to Fig. 1a is the groove formed around the edge of the internal face
of the half wheel the groove being of such a form that it may be readily stamped
at the same time that the half is being formed.
When the two halves are to be put together an internal ring is placed inside
same so as to engage in the grooves a a. This ring may be of any suitable shape
or thickness but its outer edge is provided with a groove, or is V shaped as shown
so that when the halves are forced through a die as previously described the edges
of the halves in which the grooves are formed will become projections which are
pressed into the groove on the periphery of the ring 6 so that the two halves will
be securely held together and a properly curved or flattened rolling surface will be
given to the exterior of the roller or wheel.
It will be evident that instead of a ring b, a solid or open disc, wheel or like
strengthening device may be employed.
In Fig. 3 for instance the strengthening device consists of the two discs
provided with teeth c c which are arranged to interlock. The edges of these
teeth are bevelled so as to engage with the shoulders or projections of the
grooves a a while the central part or top of each disc is provided with a hole which
fits over the turned in flange d of each half, such flange forming an increased
bearing surface for the axle or shaft.
In Fig. 5 the conical discs b' are curved instead of being straight which shape
while giving somewhat greater strength, obviates the bevelling of the teeth which
is desirable in the form shown in Fig. 3 in order to cause the teeth to lie snugly in
the grooves.
In both of these forms. the wheel is passed through the die so as to press the
edges of the halves over the discs as before described.

page_text: Having now particularly described and ascertained the nature of my said inven
tion and in what manner the same is to be performed, 1 declare that what I
claim is :-
1. In hollow rollers wheels or the like, the employment of an internal
strengthening piece or pieces arranged to connect the parts and avoid the soldering
or brazing together of the same substantially as described.
2. In hollow rollers wheels or the like the employment of an internal
strengthening ring the periphery of which is adapted to engage with grooves or
projections formed in the parts of which the roller or the like is composed
substantially as described.
3. In hollow rollers wheels or the like the employment of internal strengthening
discs having interlocking teeth adapted to engage with grooves or projections
formed in or on the parts of which the roller or the like is composed substantially
as described.
4. In hollow rollers, wheels or the like the employment of internal conically
shaped strengthening discs having interlocking teeth adapted to engage with
grooves or projections on the inside edges of the halves of the roller or the like
and central holes fitting over the flanges of said halves substantially as described.
5. The improvements in the manufacture of hollow rollers wheels or the like
substantially as described.
Dated this 17th day of March 1893
PHILIP M. JUSTICE,
55 & 56, Chancery Lane, London, Chartered Patent Agent.