Improved Means for Encasing the Chain Gear of Velocipedes.
Year: 1893

page_text: Date of Application, 16th Jan., 1893
Complete Specification Left, 16th Oct., 1893-Accepted, 18th Nov., 1893
PROVISIONAL SPECIFICATION.
Improved Means for Encasing the Chain Gear of Velocipedes.
We, PRESTON DAVIES, of Town Mead Works, Wandsworth Bridge Road, in
the County of Middlesex, and ADOS JOSEPH PERVAN, of No. 11 Grummant
Road, Peckham, in the County of London, do hereby declare the nature of this
invention to be as follows:-
According to our invention the gear wheel on the bracket and the one on the
hub of the driving wheel are each encased in a metallic or other suitable box. Each
box is provided with two tubular extensions or nozzles on its edge at the points
where, when fitted, the chain will pass from one gear wheel to the other. The box
to encase the gear wheel on the bracket is, at its back, provided with an opening to
admit of its attachment to the bracket, and on its face has a circular opening
slightly larger than the gear wheel into which a lid fits in an oil-tight manner.
The box to encase the gear wheel on the hub is formed in a manner similar to the
one above described. The back portion is so designed that it can be secured
between the spokes and the gear wheel preferably by being first formed in two
semicircular halves which are soldered or otherwise suitably secured together. A
concentric opening is provided in this part of the box of a size sufficient to admit
of its clearing the hub. The face of the box also has a concentric opening to admit
of its passage over the spindle and is firmly held in position between the cone of
the ball-bearing and the forked end of the frame of the machine.
Two tubes envelope the chain, one extending between the upper tubular extension
or nozzle in each box and the other between the two lower extensions or nozzles, the
ends of the tubes embracing or being suitably secured to the nozzles. These tubes
may either be flexible by being made of rubber or equivalent material or they may
be formed of leather, vulcanite, tin, or other light material. When the former is
used it permits of the tubes being stretched longitudinally; when made of the
latter form they may be telescopic or capable of similar extension at the nozzles of
the cases.
It will be seen that the stretching of the rubber tubes or the telescopic arrange-
ment of the alternative ones permits the easy tightening or other adjustment of
the chain.
D: 101
1
Ր
1000
A. F. SPOONER,
124, Chancery Lane, W.C., Agent for the Applicants.
COMPLETE SPECIFICATION.
Improved Means for Encasing the Chain Gear of Velocipedes.
We, PRESTON DAVIES, of Town Mead Works, Wandsworth Bridge Road,
Fulham, in the County of Middlesex, and ADOS JOSEPH PERVAN, of No. 11
Grummant Road, Peckham, in the County 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 :-
Our invention relates to that class of gear case wherein the gear-wheel on the
bracket and the one on the hub of the driving wheel are encased in separate boxes.

page_text: In the annexed drawings which illustrate our invention
Fig. 1 is a side elevation of a gear case fitted to a velocipede.
Fig. 2 is a detail view of the part A thereof, and
Fig. 3 is a cross-sectional view of the part B drawn to an enlarged scale.
The boxes A and B are made of metal or other suitable material and are each
provided with two tubular or other extensions or nozzles a, a, b, b, on their edges
at the points where, when fitted, the chain will pass from oue gear wheel to the
other.
The box A is, at its back, provided with an opening to admit of its attachment
to the bracket and its face has a circular opening c, slightly larger than the gear
wheel, into which opening a "lever" or like lid c, having a central opening d
sufficiently large to admit of its passage over the end of the crank axle, fits in a
dirt and oil-tight manner.
The box B is formed in a manner similar to the one above described. The back
portion e is the "lever" or like lid portion and is so designed that it can be secured
as required between the spokes and the gear wheel preferably by being first formed
in two semicircular halves which are soldered or otherwise suitably secured
together. A central opening is left in this "lid" part of the box sufficiently large
to clear the hub of the wheel. The face of the box also has a central opening f to
admit of the passage of the box over the spindle g and is held firmly in position
between the cone of the bearing and the forked end of the frame of the machine.
The back portion e of the box is fitted into the other portion whereupon the whole
box becomes free of the revolving parts of the wheel but is maintained firmly in
position.
The two tubes k and envelope the upper and lower run of the chain respectively.
These tubes may either be flexible as shown in the drawings, being made of rubber
or equivalent material, or they may be formed of leather, vulcanite, tin or other
light material. When flexible they are secured to the nozzles a, a, b, b by the
flexible steel or other suitable bands shown at m provided with any suitable
tightening device or by other suitable means. When rigid tubes are employed
they may be made telescopic, their ends being secured to the nozzles by collars or
other suitable means.
It will be seen that the construction of the box B permits of the drawing back of
the spindle g by means of the drag-link p or other device operating to tighten the
chain such box being affixed to, and moving bodily with, the spindle, thereby
dispensing with the slot in the gear case hitherto necessary.
Flexible rubber or equivalent tubes admit of being stretched longitudinally as
the chain is tightened. When rigid tubes are employed they or the nozzles
themselves may be made telescopic for this purpose.
Although above described as applied to a safety bicycle in the form now
generally made, it is evident the construction may be modified to suit different types
of machines without departing from the spirit of our invention.
We e are aware that gear cases have already been constructed with separate covers
for the two runs of the chain; that such runs of chain have been covered by
flexible tubing; also that lever lids have been used in gear cases; and we do not
claim such as our invention, but
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is ;-
1. In a gear case for velocipedes constructed with separate covers for the two
runs of the chain, the box B having a central opening of sufficient size only
to admit of its passage over the spindle g, such box being so formed and moving
bodily with the spindle of the wheel as to permit of the adjustment of the chain
substantially as set forth.
2. In a gear case for velocipedes constructed with separate covers for the two

page_text: runs of the chain, the combination, with the box B, of a box A, secured to the
bracket of the machine and flexible or telescopic tubes k, I detachably secured to
such boxes, substantially as set forth.
Dated this 16th day of October 1893.
A. F. SPOONER,
124, Chancery Lane, W.C., Agent for the Applicants.