Year: 1895

page_text: Date of Application, 15th Nov., 1895-Accepted, 21st Dec., 1895
протомецю голамда бутор.
I, WILLIAM GEORGE GARNETT, .of 331 Bradford Street, in the City of
Birmingham, Machine and Tool. Maker, 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 the manner in which I construct the back fork tubes
or chain stays of a cycle, my object being to readily produce a durable tube or
stay having less weight but greater strength than those of the ordinary construction
as at present in general use.
In order that my invention and the method of carrying the same into effect may
be the more readily understood I append hereunto one sheet of explanatory drawings
to be hereinafter reforred to.
Figure 1 is a part plan of a rear driven bicycle of the safety type showing the
ordinary position of the back fork tubes or chain stays.
Figure 2, and Figure 2ª are sectional plans of a back fork tube or chain stay
constructed in accordance with my invention.
Figure 3 is a sectional elevation of the tube on the line ab, Figure 2, and
Figures 4 & 5 sectional elevations on the line c, d, Fig. 2, where the section of the
tube may be either of a D shape as shown in Figure 4, or an oval shape as shown
in Figure 5.
For my improved back forks or chain stays I use thin weldless steel tubes; but
before flattening the tube to the usual D or oval shape throughout the greater
part of its length, and bending or cranking the same, I insert within one end of
the tube a liner or short length of smaller tube for the purpose of strengthening
the stay at its weakest part, that is the part indicated at A, Figure 2 which is beat
or cranked to pass round the tyre B as shown at Figure 1.
The short end C of the back fork tube I prefer to leave in its original circular
shape as shown at Figure 3, for insertion and fixing to the bottom bracket E, but the
longer end F is of a D or oval shape as shown at Figures 4 and 5, throughout its
entire length. The extremity of the end F is secured to the rear part of the cycle
framing as illustrated at Figure 1.
To prevent the appearance of any ridge or unevenness on the exterior surface
of the tube at the end of the liuer or bush, I sometimes taper the extremity of the
liner before insertion within the tube.
Instead of using an internal stiffening liner for my crank tube, as hereinbefore
described, and as shown at Figure 2, 1 sometimes employ tubes having a greater
thickness at the portion which is to be cranked, as illustrated at Figure 2ª, and
thus secure the objects herein before described when inserting an independent
thickening or strengthening piece.
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. In the back fork tubes or chain stays of a cycle the use of a liner or bush
for the purpose of strengthening the beut or cranked part substantially as herein

page_text: 2. The improved back fork tubessorychain stays for cycles substantially as
hereinbefore described and as illustrated in the accompanying drawings.
Dated this 14th day of November 1895..
MARKS & CLERK,
18 Southampton Buildings, London, W.C., and
13 Temple Street, Birmingham, Agents for the Applicant..