An Improvement in Helical Coil Springs.
Year: 1889

page_text: Date of Application, 1st Aug., 1889-Accepted, 21st Sept., 1889
A
CONE DEL FULDA
An Improvement in Helical Coil Springs.
I, WILLIAM BLAKELY, of Vernon, Princess Road, West-Bournemouth, in the
County of Hants, Estate Agent, do hereby declare the nature of this invention and in
what manner the same is to be performed, to he particularly described and ascertained
in and by the following statement :-
My Invention relates to the manufacture of spiral or helical springs for all the
various purposes for which such springs are applied, whether they act in tension
or in compression, but particularly the latter and under circumstances where they are
located in cramped spaces; and the invention has for its object to increase the
elasticity of the spring and to adapt it to lie snugly in spaces where a spiral spring of
the same diameter and of the ordinary circular section could not be introduced.
The Invention consists primarily in forming the spring of what I may term a
concavo-convex section which I find is eminently adapted to fit in a semi-annular
space between an internal rod or tube and an external enclosing tube or casing, the
concave side of the spring fitting around the inner rod or tube. Such a forin of
spring is also well adapted for use as with the metallic packing rings of engine and
other pistons, the concave side being in that case outwards and receiving around it
the correspondingly shaped packing rings, whereby the latter are held in place on
the piston at same time that they are expanded and kept tight against the sides of the
cylinder. These particular applications of my improved spring are mentioned merely
by way of example and I do not in any way limit myself in this respect as my
invention resides in the special form of the spring itself. I would observe that I do
not limit myself to the particular curvatures delineated as my invention is susceptible
of variation and includes all forms substantially similar to those shown.
But the
Reference is to be had to the accompanying drawings forming part of this
Specification wherein figure 1 is a perspective view, and figure 2 an end view, of
one form of my improved spring. Figures 3 and 4 are modifications of the form.
The spring shewn in figures 1 and 2 has the members a a at one side of the spring
concave whilst the members at the opposite side are convex as at b b.
spring instead of being convex at one side, as at bb, may be flat, as at c, in
figure 3, the other side being concave, as in figure 1. Or both sides may be
oppositely concaved, as shewn in figure 4. Springs of these forms would be made
by first winding the wire on a mandrel of the intended form of the spring and then
pressing the coils of wire into the concave side of the mandrel by a second or third
special tool adapted to give the desired form to the spring.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is;
The herein described spiral or helical springs of concavo-convex or plano-concave,
or bi-concave, form in cross-section substantially as specified.
Dated this 30th day of July 1889
WM. BLAKELY.