Year: 1896

page_text: I, Dr. PAUL HUNABUS, of The Celluloid Works, Leinaustrasse, Linden, near
Hanover, in the German Empire, Manufacturer, do hereby declare the nature of this
invention to be as follows:-
This invention relates to improvements in and connected with gear cases for
velocipedes.
In celluloid gear cases as heretofore generally constructed, it has been found that
the wooden centre piece is most convenient in use, but it has also been found that the
fastening of the celluloid plates to the said centre piece, which is provided with
grooves to receive the halves of the gear case, is very inconvenient on account of the
number of screws which have to be manipulated. Machines also vary slightly so that
the centre pieces or blocks, which are made to pattern, sometimes cause the gear case
to lie in a direction not quite parallel to the chain.
To obviate this disadvantage I employ a centre piece composed of two strips of
wood or the like designed to be clamped to the frame of the machine by suitable
clamps, the said strips being secured to the clamps by means of screws which pass
through slots in the said strips so as to allow of adjustment..
Suitable clamps which I advantageously use in practice are formed of strips of
sheet metal bent to the shape of the bar to which they are to be secured.
In some cases I form the clamp in two parts hinged together at one end and having
their other ends bent up and adapted to be screwed or otherwise secured together and to
the strips. The bent up ends for receiving the adjustable screws may, if desired, be
formed separately from the hinged parts and soldered or otherwise secured to the
same. Or the clamps may be formed of a single or double plate recessed on its inner
edge to the shape of the bar to which it is to be secured and of a bent wire designed
to be passed round the said bar and secured to the said single or double plate.
In some cases instead of screwing the wooden strips directly to the clamps,
I provide slotted strips having eccentric holes, to which the said strips are screwed.
Dated the 10th day of August 1896.
G. F. REDFERN & Co.,
4. South Street, Finsbury, London, Agents for the Applicant.
Improvements in and connected with Gear Oases for Velocipedes.
I, Dr. PAUL HUNABUS, of The Celluloid Works, Leinaustrasse, Linden, near
Hanover, in the German Empire, 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 :-
This invention relates to improvements in and connected with gear cases for

page_text: In celluloid gear cases as heretofore generally constructed, it has been found
that the wooden centre piece is most convenient in use, but it has also been
found that the fastening of the celluloid plates to the said centre piece, which is
provided with grooves to receive the halves of the gear case, is very inconvenient
on account of the number of screws which have to he manipulated. Machines
also vary slightly eo that the centre pieces or blocks, which are made to pattern,
sometimes cause the gear case to lie in a direction not quite parallel to the chain.
To obviate this disadvantage I employ a centre piece composed of two strips of
wood or the like designed to be clamped to the frame of the machine by suitable
clamps, the said strips being secured to the clamps by means of screws which
pass through slots in the said strips so as to allow of adjustment. Suitable clamps
which I advantageously use in practice are formed of strips of sheet metal bent
to the shape of the tube or stay to which they are to be secured.
In some cases 1 form the clamp in two parts hinged together at one end and
having their other ends bent up and adapted to he screwed or otherwise secured
together and to the strips. The bent up ends for receiving the adjustable screws
may, if desired, be formed separately from the hinged parts and soldered or
otherwise secured to the same. Or the clamp may be formed of a single or
double plate recessed on its inner edge to the shape of the tube or stay to which
it is to be secured and of a bent wire designed to be passed round the said stay
and secured to the said single or double plate.
In some cases instead of screwing the wooden strips directly to the clamps,
1 provide slotted plates having eccentric holes, to which the said strips are bolted.
To enable my invention to be fully understood I will describe it by reference to the
accompanying drawing, in which :-
Figure 1 is a cross section of a gear case made according to my invention:
Figure 2 is a side view of a part of a gear case centre piece clamped in position on
a cycle frame,
Figures 3 and 4 are views of details:
Figure 5 is a cross section of a contre piece and modified form of clamp made
according to my invention:
Figure 6 is a side view of the same :
Figure 7 is a plan of the clamp:
Figure 8 is a cross section similar to Figure 5 but showing a different form of
clamp:
Figures 9 and 10 are views similar to Figures 5 and 6, shewing a slightly modified
construction of clamp:
Figures 11 and 12 are views similar to Figures 9 and 10 of a further slight
modification; and,
Figure 13 is a view of a detail.
A is the bottom tube or stay of the cycle frame to which the gear case is to be
secured and a, a are the two strips of wood or the like forming the centre piece for
the celluloid halves B, B of the gear case which are secured thereto, the said
strips a, a being, as above described, fixed to the tube A by clamps.
In the arrangement shown in Figures 1, 2, 3 and 4 the clamp is formed of a
double plate recessed on its inner edge to the shape of the tube A as shewn in
Figure 1, and of the bent wire or stirrup c which passes around the tube A and is
secured at each end to the double plate & hy nuta d, d the said ends being screw
threaded to receive them. By screwing up these nuts the clamp is tightly secured to
the tube A. To secure the clamp to the two strips of wood a, a in such a manner
that the said strips can be adjusted in position so as to be fixed parallel to the chair
of the cycle, the ends e, e of the two plates b forming the clamp are turned down at
right angles to the plates A, b (see Figure 3) so as to form slots in which bolts,
engage, the said bolts being retained in the slots by their heads f, f. These
bolts, pass through transverse slots g, g (Figures 1 and 4) in the strips a, a and
are retained in position by washers A, A and nuts i, i by tightening up which the
clamps are securely fixed to the strips a, a. With this arrangement it will be obvious

page_text: that the strips can be adjusted laterally to an extent equal to the length of the
transverse slots g, g and of the slot formal by the ends e, e of the plate b, b.
In Figures 5, 6 and 7 the clamp is shown made of a single piece of sheet metal;
bent to the shape of the tube to which it is to be fixed and having its outer ends bent
up so as to form flanges k, k which are secured together by the bolt anl nat / so as
to tighten the clamp to the tube A on to which it is sprung. The clamp is provided
with lateral plates in which are bent downwards and inwards at their ends n, n as
described with reference to the clamp shewn in Figures 1, 2 and 3 so as to form slots
for the engagement of the bolta f, f. In this modification the strips a, a are shown
without the transverse grooves g, g but they can, of course, be provided with such
grooves if desired.
In the arrangement shown in Figure 8 the clamp is formed of a strip; of sheet
metal made so as to embrace the tube A to which it is to be clampel. The free
ends k, k of the strip; are turned outwards as in the previous modification and aro
adapted to be locked together by the bolt . The clamp j is adjustably secured to the
strips a, a by bolts f, which pass up through the transverse slots g, g in the said.
strips as in the arrangement described with reference to Figures 1, 2, 3 and 4 the
said bolts f, f being soldered or otherwise suitably secured to the clamp j.
The olamp shewn in Figures 9 and 10 is similar to that shown in Figure 8 with
the exception that the sheet metal strip ; is hinged at j¹.
In the arrangement illustrated in Figures 11, 12 and 13 the clamp proper is
formed of a strip or platej with flanges k, k as in the modification shown in Figure 8
but it is secured indirectly to the wood strips a, a by the slotted plates, o fixed to
the strips a, a by bolts f, which engage with the slots in the plates o, o thereby
allowing of adjustment.
As above described it will be obvious that, with my improved construction of centre
piece for celluloid gear cases, the said gear cases can, by suitably adjusting the
strips a, a of which the centre piece is composed, be arranged truly parallel with
the chain and can be readily attached to and removed from the cycle by means of
the clamps.
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. A gear case for cycles wherein the two halves of the case are secured to the
bottom tube or stay of the cycle by means of a centre piece consisting of two strips
adapted to be secured to the tube or stay of the cycle by suitable clamps, substantially
as described and illustrated.
2. In gear cases for cycles, the employment of a centre piece comprising two wood
strips adapted to be secured to the bottom tube or stay of the cycle by a clamp
consisting of a single or double plate recessed to fit the said tube or stay and of a
curved wire or stirrup, the said clamp being adjustably secured to the strips forming
the centre piece by bolts which pass through transverse slots in the said strips,
substantially as hereinbefore describad and illustrated.
3. In gear cases for cycles the employment of a centre piece comprising two
woolen strips adapted to be secured to the bottom tube or stay of the cycle by a clamp
consisting of a sheet metal strip formed to embrace the said tabe and to be bolted
together at its ends and to the wooden strips by bolts which pass through transverse
slots in the strips, substantially as described and illustrated.
4. In gear cases for cycles, the employment of a centre piece comprising two
wooden strips adapted to be secured to the bottom tube or stay of the cycle frame
by a clamp consisting of a sheet metal strip bent to embrace the said tube or stay and
having lateral extensions, the outer ends of which are bent downwards and inwards
so as to form slots by means of which the said clamp can he adjustably secured
to the two strips through the medium of bolts, substantially as described and
illustrated.
5. In gear cases for cycles, the employment of a centre piece comprising two

page_text: wooden strips adapted to be secured to the bottom tube or stay of the cycle frame by
a clamp consisting of two sheet metal strips hinged together at one end, formed to
embrace the said tube and adapted to be secured together at their other ends, the said
-clamp being provided with bolts which pass up through transverse slots in the wooden
strips of the centre piece to enable the said strips to be adjusted in position,
substantially as described and illustrated.
6. In gear cases for cycles, the employment of a centre piece comprising two
wooden strips adapted to be secured to the bottom tube or stay of the cycle frame by
a clamp consisting of a metal strip bent to embrace and grip the tube, the said strip
being connected by bolts to slotted plates which are secured to the two wooden strips
by screws which engage with the slots in the said slotted strips so as to enable the
centre piece to be adjusted in position, substantially as described and illustrated.
7. The manufacture and use of the improved centre pieces for cycle gear cases
herein before described and illustrated respectively in Figures 1, 2, 3 and 4; 5, 6
and 7; 8, 9 and 10, and 11, 12 and 13 of the accompanying drawing.
Dated this 5th day of Man 1807
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.