Improvement in Bicycle and other Light Vehicle Frames.
Year: 1895

page_text: Date of Application, 18th Apr., 1895
Complete Specification Left, 5th Dec., 1895-Accepted, 25th Jan., 1896
PROVISIONAL SPECIFICATION.
Improvement in Bicycle and other Light Vehicle Frames.
I, JOHN CARLSON, of No. 245, 50th Street, Brooklyn, New York, United
States of America, Machinist, do hereby declare the nature of this invention to
be as follows:-
This invention relates to an improved frame for bicycles and other light vehicles
and more particularly to the construction of the tubing of which such frame is
composed.
Heretofore such tubing was made of uniform bore and was re-enforced at the
ends, by brazing short sleeves into the same. This construction renders the frame
expensive and its manufacture complicated. I propose to dispense entirely with
the sleeves and to obtain the additional strength at the ends, or at any other
point needed, by reducing the bore of the tubing at such points. Thus I obtain a
frame of great strength, lightness and simplicity. In forming the frame, I first
construct a length of drawn steel tubing which is of uniform exterior diameter,
but of variable interior diameter. That is to say, the bore of the tube is
alternately diminished and increased to form thickened sections and intervening
reduced sections. A tubing thus constructed is next cut up through its thickened
sections into the lengths required to form the parts of a bicycle frame.
As the thickened sections are pretty long, each cut can be readily so laid, that
each of the severed pieces has two re-enforced ends, and a reduced body between
such ends. But if desired the body may be provided with re-enforced sections
between the ends, where extra strength is required. The fork of the frame is
closed at the lower end and such end is also re-enforced by being thickened. The
advantages connected with my invention are that with the tubing furnished, the
frame can be put together with great facility, and that such frame will be of
greatly increased strength and of superior finish.
DISA 1905
ALLISON BROS.,
Agents for the Applicant.
Improvement in Bicycle and other Light Vehicle Frames.
I, JOHN CARLSON, of 245 50th Street, Brooklyn, New York, United States of
America, Machinist, 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 an improved frame for bicycles and other light
vehicles, and more particularly to the construction of the tubing of which such
frame is composed.
Heretofore such tubing was made of uniform bore and was re-enforced at the
ends, by brazing short sleeves into the same. I propose to dispense entirely with
such sleeves and to obtain the additional strength at the ends or at any other points

page_text: *needed, by reducing the bore of the tubing at such points. Thus I obtain a frame
of great strength, lightness and simplicity.
In the accompanying drawing:
Fig. 1 represents a longitudinal section of a length of tubing adapted to form
a part of my improved bicycle frame.
"Fig. 2 is an elevation, partly in section of a bicycle provided with my improved
-frame.
Fig. 3 is a longitudinal section of the frame, and
Fig. 4 a longitudinal section through the lower end of the fork 63, taken at
right angles to Fig. 3.
The letter A, represents a length of drawn steel tubing which is of uniform
-exterior diameter but of uneven bore. That is to say the bore of the tube
is alternately diminished and increased to form the integral re-enforced end
sections a, and the intervening reduced sections a. A tubing thus constructed
is cut up or drawn to the lengths required to form the sections 6, of a bicycle frame.
Each section b, has two integral re-enforced ends ¹, and a reduced body between
such ends, but if desired, one or more additional re-enforced sections may be
formed within the body of the tube, if extra strength is required.
The fork 6, of the bicycle frame is also provided with an upper and a lower
integral re-enforced end. The lower re-enforced end, is compressed or flattened
(Fig. 4) so as to close the fork. It will be seen that by thickening the lower end
of the fork, the latter need not be pressed together to an undue extent while
flattening it, and at the same time the necessity of introducing an additional core
piece is avoided. Thus the closing operation of the tube is facilitated and
additional strength is obtained.
The lengths of tubing constructed as described are assembled in the ordinary or
suitable manner and are then connected by the sockets c. These sockets project
over the integral re-enforced ends 61, of the tubing but not over the reduced body
thereof. Thus it will be seen that a frame is produced which though light,
possesses the required amount of terminal strength, can be readily put together
and does not require the introduction of additional core pieces.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what I
claim is:
1. A bicycle frame composed of tubes having integral re-enforced ends, and of
sockets that project over such ends, substantially as specified.
2. A fork for bicycle frames having a lower integral thickened end which is
Hattened to close the fork, substantially as specified.
3. A bicycle frame, substantially as herein shown and described.
Dated this 5th day of December 1895.
ALLISON BROS.,
Agents for the Applicant.