Improvements in and relating to Bicycles.
Year: 1895

page_text: Improvements in and relating to Bicycles.
I, JOHANN PUCH of 26, Karlauerstrasse, Graz, in the Empire of Austria, Cycle
Manufacturer, do hereby declare the nature of this invention to he as follows:-
This invention relates to certain improvements in the back ends of the main
frames of rear-driving bicycles wherein the axle of the driving wheel is mounted
and its position varied for the purpose of adjusting the tension of the driving
chain.
According to this invention, the ends of each member of the tubular back fork
instead of being pressed up to make a solid end is first strengthened by means of a
short length of tube preferably placed outside the member and is then pressed up
until it assumes an oblong shape with round edges. In the end thus formed the
usual slot is cut to receive the axle of the driving wheel. The ends of the fork
running down from the top of the main frame to the axle of the driving wheel
instead of being fixed to the rear ends of the members of the lower back fork have
suitable openings made in them adapting them to slide on the slotted ends of the
members of the lower back fork as herein before described.
In the slots in the ends of the members of the lower back fork are placed the
usual adjusting screws, the eyes of which are made of such a thickness that they
will just fit in the hollow parts of the back forked ends, so that when the axle is
tightened up by the nuts on the threaded ends thereof, the eyes of the adjusting
screws act as distance pieces and prevent the tubular ends of the back fork from
being squeezed up.
The adjusting screws act in the usual way by means of nuts threaded on
their free ends bearing against washers fitting on the slotted ends of the lower
back fork.
this 10th day of April 1895.
ROBERT E. PHILLIPS, Assoc. M. Inst. C.E., M.I. Mech. E.,
Consulting Engineer and Patent Agent,
70, Chancery Lane, London, W.C., Associate Agent.
Improvements in and relating to Bicycles.
I, JOHANN PUCH, of 26, Karlauerstrasse, Graz, in the Empire of Austria, Cycle
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 certain improvements in the back euds of the main
frames of rear-driving bicycles wherein the axle of the driving wheel is mounted
and its position varied for the purpose of adjusting the tension of the driving
chain.
According to this invention, the ends of each member of the lower back fork
instead of being pressed up to make a solid end is first strengthened by means of a
short length of tube preferably placed outside the member and is then pressed up
until it assumes an oblong shape with round edges. In the end thus formed the
usual slot is cut to receive the axle of the driving wheel. The ends of the upper

page_text: back fork, running down from the top of the main frame to the axle of the driving
wheel instead of being fixed to the rear ends of the members of the lower back fork,
have suitable openings made in them adapting them to slide on the slotted ends of
the members of the lower back. fork as herein before described.
In the slots in the ends of the members of the lower back fork are placed the
usual adjusting screws, the eyes of which are made of such a thickness that they
will just fit in the hollow parts of the lower back forked ends, so that when the axle
is tightened up by the nuts on the threaded ends thereof, the eyes of the adjusting
screws act as distance pieces and prevent the tubular ends of the lower back fork
from being squeezed up.
The adjusting screws act in the usual way by means of nuts threaded on
their free ends bearing against washers fitting on the slotted ends of the lower
back fork.
In the accompanying drawing which illustrates this invention
Figure 1 is a view in side elevation of a bicycle fitted with the device.
Figures 2, 3 and 4 are views in side elevation, back end elevation and plan
respectively of the device.
Figures 5, 6, 7 and 8 are views in side elevation, eud elevation, plan and sectional
plan respectively of the lower back fork end.
Figures 9, 10 and 11 are views in side elevation, end elevation and plan
respectively of the upper back fork end.
Figures 12, 13 and 14 are views in side elevation, end elevation and plan
respectively of the adjusting screw, and
Figures 15, 16 and 17 are views in side elevation, end elevation and plan
respectively of the washer.
Throughout the views similar parts are marked with like letters of reference.
Referring to the drawings, A designates the axle of the driving wheel, C the
enlargements formed thereon and M the clamping nuts screwed on the threaded
ends thereon. F designates the pedal crank axle, K the driving chain, L the
members of the lower back fork, H the members of the upper back fork, L¹ the
tubular slotted extension of the members L of the lower back fork, which are
preferably reinforced by tubular pieces and have slots adapted to receive the
ends of the axle A. H' designates the sockets formed on the ends of the
members H. S designates the adjusting screws having eyes D adapted to fit over
the ends of the axle A the said eyes being of a sufficient width to fill up the
recesses in the slotted ends L' of the members L. m designates the nuts
threaded on the screws S, and P the washers adapted to fit over the ends of
the slotted ends L' of the members L of the lower back fork and against which
the nuts m bear.
I wish it to be particularly understood that I do not limit myself to the precise
details of construction herein before described. and illustrated by the accompanying
drawing but that I hold myself at liberty to make such changes and alterations
as fairly fall within the spirit and scope of my invention.
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 :-
The combination of parts herein before described and illustrated by the accom-
panying drawing, forming an improved device for varying the position of the
axle of the driving wheel of a cycle for the purpose of adjusting the tension
of the driving chain.
Date
is 9th day of January 1890.
ROBERT E. PHILLIPS, Assoc. M. Inst. C.E., M.I. Mech. E.,
Consulting Engineer and Patent Agent,
70, Chancery Lane, London, W.C., Associate Agent.