Improvements in Chainboxes for Bicycles and other Wheeled Vehicles.
Year: 1893

page_text: ate of Application, 3rd Oct., 1893-Accepted, 4th Nov., 1893
COMPLETE SPECIFICATION.
Improvements in Chainboxes for Bicycles and other Wheeled
Vehicles.
I, JOHAN ANTONI PROBST, Manufacturer, of Sondergade No. 1, Odense, in
the Kingdom of Denmark, 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 has for its object, to construct a chain box for cycles in such a
a manner, as to render the access to the chain or the chain wheels as easy as
possible and likewise, that the box can be easily taken off or put on.
Such a chain-box is illustrated by the accompanying drawings, Sheet I,
Fig. 1 being a side view of the box when closed,
Fig. 2 showing the same, when open.
Fig. 3 showing the reverse side, when closed.
The principal feature of novelty is, that the piece A can be entirely taken off,
as shown in Fig. 2, and after having been put on again, is easily secured by means
of two slides a and b, as shown in Fig. 1. At the opposite end. of the box, the
circular disc B forms a loose cover; when this disc is taken off and likewise the
piece A at the opposite end, the chain and chain-wheels are freely accessible;
c and d indicate two slides corresponding to the slides a and b on the opposite side.
All the slides are moved on ledges, which are preferably dove tailed and soldered
on to the outside of the box; indicates a loose transverse slide.
Characteristic for this chain box is also, that it has a circular or semicircular end
part, which is covered by the said disc B, and from which part emanate two hollow
arms D and E separated by an open space C, which reaches to the opposite end of
the box, past the rear chain-wheel. The said hollow arms form the chain passages,
and owing to the interval between these, the whole box has a certain elasticity,
which is not without influence on the driving, unlike the ordinary chain boxes,
which are closed and rigid. Between the chain passages is placed a tube h, which
allows the oil, that the chain has dragged up with it into the upper chain passage,
to run down into the lower passage, from which it is drained out through the
outlet k. The slide serves to close the aperture before the rear wheel, in order
to prevent the ingress of dust; when the slide is drawn out, the access to the rear
wheel is free; indicates the rear chain wheel; m the front wheel, both are shown
by dotted lines; n indicates the chain, p and q the two axles for the chain wheels.
The box is fixed to the framework by the screws r and s, which latter only is passing
through the inside of the box. When the box is to be put on, the slide f is
temporarily removed. The box is lined inside with felt or similar material adapted
to deaden the sound. Instead of slides, hinged lids may be employed, for keeping
the piece A in place.
The improved chain box is also shown on Sheet II, Fig. 1 representing the same
closed, Fig. 2 open and looked at from the same side, and Fig. 3 closed, looked at
from the opposite side. The letters of reference indicate the same or corresponding
parts, as on Sheet I, the difference between the two constructions being only, that
the slides a 6 are placed differently, those on Sheet II being arranged in the same
manner as the slides c d on the opposite side.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is ;-
1. A removeable chain box for cycles, comprising in its construction a detachable
niece (A) arranged
90 OR
give

page_text: (Fig. 2), and sliding covers or lids adapted to retain the said piece in place and to
keep the interior free of dust, substantially as described.
2. A detachable chain box having a circular forepart, from which emanate two
hollow arms leaving an open interval (C), which reaches to the opposite end of the
box and forms a bearing for the axle on which the rear chain wheel is mounted.
3. A chain box having its side walls internally lined with felt or a similar material
for the purpose of deadening the sound.
4. The application of the slides a and b, as shown in Figs. 1 and 2, Sheet II.
Dated this 29th day of September 1893.
FAIRFAX & WETTER,
433, Strand, London, Agents.