Tube Bending.
Year: 1896

page_text: Date of Application, 6th Mar., 1896
Complete Specification Left, 5th Dec., 1896-Accepted, 6th Mar., 1897
PROVISIONAL SPECIFICATION.
Tube Bending.
TOM ALFRED WOOLLDRIDGE Spring Manufacturer 24 Alfred Road, Hands-
worth Birmingham do hereby declare the nature of this invention to be as
follows:-
My invention relates to an improved method of bending steel, brass or other
tubes by means of loading or filling said tube with a flexible spring so made that
the length of spring is not shortened by bending into the curved form, and as
I use a tight fitting spring, the tube cannot shorten on the inner curve, by reason
of friction with said tight spring, the result being, freedom from pushers. To
effect this, I make a spring of angular steel wire, of taper section so that when
coiled, the edges of wire on surface of spring touch. I cause a tight fitting
spring made as above to enter a tube requiring to be bent, as follows, I insert
one end of spring into mouth of tube, & into other end of spring, I insert the
taper point of a spindle turning in bearings, & after covering spring with another
tube or sheath I turn the spindle whilst pushing the tube to be bent on to point of
spring, the result being, the spring is reduced in diameter & enters tube.
After tube is bent, to extract the spring, I repeat the operation but pull the
bent tube instead of pushing.
Dated this Fifth day of March 1896
T. A. WOOLLDRIDGE.
COMPLETE SPECIFICATION.
Tube Bending.
TOM ALFRED WOOLLDRIDGE Spring Manufacturer 24 Alfred Road Hands-
worth Birmingham 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 :-
My invention relates to an improved method of bending metal tubes by means
of loading or filling said tube with a flexible spring, so made, that the length of
spring is not shortened by bending into the curved form, and by using a tight
fitting spring the tube is prevented from puckering on inner curve by reason of
friction on surface of said tight spring. To effect this I make a spring of angular
wire of taper section, Fig. 1. so that when coiled the edges of wire on surface of
spring, touch A Fig. 2 longitudinal section of spring. I cause a tight fitting
spring thus made to enter a tube as follows, I insert one end of spring into mouth of
tube, & into other end of spring I insert the taper point of a spindle P turning
in bearings Fig. 3 & after covering spring with another tube or sheath, I turn the
spindle whilst pressing the tube to be bent & spring together, the result being, the
spring is reduced in diameter & enters tube. To extract spring from bent tube
I repeat the operation, but pull the tube & spring apart, instead of pressing.

page_text: Having now particularly described & ascertained the nature of my said inven-
tion, & in what manner the same is to be performed, I declare that what I
claim is,
(1.) A spring loading for bending tube, without space between coils, made as
above.
(2.) A method of inserting & extracting a tight spring by an apparatus as
.described.
Dated this 4th day of December 1896
T. A. WOOLLDRIDGE.