Improvements in or relating to the Parts of Velocipedes.
Year: 1890

page_text: Date of Application, 29th Sept., 1890-Accepted, 22nd Nov., 1890
UUMI LEIE DIECIFICATION.
Improvements in or relating to the Parts of Velocipedes.
FREDERICK WESTWOOD 324 Cheapside Birmingham Agent 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:-
"
66
The object of my invention is to effect an improvement in the round steel tubes
used in the making of velocipedes. Hitherto these round steel tubes have been con-
structed of that variety known as the "weldless" "improved weldless or lap-
welded" tube. Steel tube drawn round from a sheet of metal until the two edges
touch each other and the edge or seam of the tube so formed connected by soldering
or brazing, has been found insufficiently strong for the purpose above described being
liable to twist and crack.
In my invention I so construct the tube drawn from sheet steel as to render it
equal if not superior to the before mentioned classes of tubes, and which can be
produced at much less cost.
The method by which I accomplish this is as follows.
By the first method, having a sheet of steel of the required width length and
thickness, I by suitable means reduce the thickness of the two edges so that when I
draw it into tubular form the two edges by suitable means will be made to overlap
forming a double thickness of metal along the line of the circumference of the tube
which double thickness together is equal to the general thickness or guage of the
tube. This double thickness I join together by brazing or soldering either by heat or
electricity.
By the second method, I draw a round steel tube similar to the first mentioned
brazed tube drawing the edges closely together as described. Into this tube I insert
another tube either closed together as the first or having an aperture or opening of
any width I require so long as the inner tube forms a greater part of a circle than a
seinicircle. This second tube is inserted so that the two seams or apertures are away
from each other, generally the aperture or seam of the inner tube will be directly
opposite the seam of the outer tube i.e. the two seams will be the extreme points of a
semicircle. I then braze or solder as before described, the inner and outer tube
together.
I may vary this method by (1) brazing one or other or both of the tubes before I
insert the inner tube (2) by drawing over the inner surface of the outer tube or the
outer surface of the inner tube a thin coating of some metal brass or copper by
preference either before or after they are separately brazed together. I then fit them
into each other as before described, and by heating, seal the tubes firmly together by
melting this middle coating of metal (3) or instead of drawing this coating of metal
upon either the one tube or the other I may effect the same by depositing by electricity
a coating of metal for this purpose.
By my third method I draw a piece of sheet steel, round in a spiral or coil form
till the outside and inside edges are opposite. I then by suitable means compress the.
tube so as to form one uniform thickness and then finish in the before mentioned
forms.
And in order that this my said invention may be the more clearly understood I will
now describe it by aid of the sheet of drawings accompanying.
Fig. 1. shews a sectional view of the ordinary brazed steel tube joined at seam a.
Fig. 2. shews a sectional view of method 1. shewing two forms b. a butted method ca
flanged method; of the double surface or thickness along the line of the circumference
formed by reducing the edges of the steel sheet.
Fig. 3. shews a sectional view of method 2. Two thicknesses joined along the line

page_text: of the circumference, formed by sliding the inner tubed into the outer tubee. x shews
the closed inner seam, y the open inner seam.
Fig. 4. shews a sectional view of method 3. The spiral form, f before compression
g compressed.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I hereby declare that
what I claim is
or
I. The junction of round steel tubes by forming a double thickness or layer along
the line of circumference, connecting this junction when so formed by brazing
soldering this double thickness or layer together either by heat or by electrical
deposition.
II. The general arrangement and construction of parts the whole forming
"Improvenients in or relating to the parts of velocipedes."
Dated this 23rd day of September 1890.
VERDWAAD
FREDERICK WESTWOOD.