Improvements in Coiled or Spiral Springs.
Year: 1899

page_text: tu. 11.
rg114
Improvements in Coiled or Spiral Springs. ! f!
I, FREDERICK JOHN TALBOT, of Globe Steel.Works, Sheffield, in the County of
York, Chairman of Ibboison Brothers and Company, Limited, do hereby, declare
the nature of this invention to be as follows:-
Heretofore "nest" springs have been formed of three different springs working
one inside the other and in some cases the outer spring has been of rectangular
section while the inner springs have been of circular section, the outer spring
having a vertical diameter of cross section greater than that of either of, the
inner springs of which latter the innermost has the smaller cross section.
"Nest" springs occupy a great amount of space in proportion to their strength
and they are expensive to produce.
The object of my invention is to produce a spring to take the place of the
nest spring which shall be cheaper to produce, weigh less and be stronger
than the "nest" spring.
66
For this purpose I roll a metal bar to something like the section of a nest"
spring of the character hereinbefore referred to; that is to say the outer portion
of the said bar is of rectangular cross section, the intermediate part of a smaller
circular cross section and the innermost part of a still smaller circular cross
section, the said several parts being connected together by small hollow curved
webs. The various parts of this bar are also arranged closer together than the
several springs of a nest spring and their centres are all in the same plane.
As a modification, the outer part of said bar may have a circular cross section
of larger diameter than the intermediate part, and the intermediate and inner-
most parts may, in cross section, be of a gradually reduced vertical diameter as
compared with the outer portion.
"
"
"In coiling a bar of any of the above sections into a spring there would be
less distortion of the material than in springs of the ordinary shape and the
tempering of the spring would be improved, it would therefore be less liable to
fractured
1
"

page_text: 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:-
*
I will describe my invention by the aid of the accompanying drawings, in which
Fig. 1 is a sectional view of a nest" spring of the construction heretofore
adopted.
Fig. 2 is a sectional view of a coiled spring constructed according to my
invention and Figures 3 and 4 are sectional views of slightly modified forms of
my improved spring.
Heretofore nest springs have been formed as shown at Fig. 1 of three different
springs a, b, c, working one inside the other and in some cases the outer spring a
has been as shown of rectangular section while the inner springs b, c, have been
of circular section, the outer spring a having a vertical diameter of cross section
greater than that of either of the inner springs b, c, of which latter the inner-
most has the smaller cross section.
"Nest" springs occupy a great amount of space in proportion to their strength
and they are expensive to produce.
The object of my invention is to produce a spring to take the place of the
"nest" spring, which shall be cheaper to produce, weigh less and be stronger
than the nest," spring.
6
For this purpose, as represented at Figs. 2, 3, 4, I roll a metal bar to something
like the section of a nest" spring of the character herein before referred to;
that is to say according to the forms shown at Figs. 2 and 3 the outer portion a
of the said bar is of rectangular cross section, the intermediate part 6 of a smaller
circular cross section and the innermost part of a still smaller circular cross
section the said several parts being connected together by small hollow curved
webs d. The various parts of this bar are also arranged closer together than
the several springs of a nest spring and their centres are all in the same
plane.
The form of spring shown at Fig. 3 has its outer portion a of greater horizontal
cross section that that of the form shown at Fig. 2.
As a modification the outer part a of said bar may as shown at Fig. 4 have
a circular cross section of larger diameter than the intermediate part and the
intermediate and innermost parts b, c may in cross section be of a gradually
reduced vertical diameter as compared with the outer portion a.
The vertical section of the bar forming my improved spring is gradually
reduced and flattened as usual to form suitable bearing surfaces. In coiling a bar
of any of the above sections into a spring there would be less distortion of the
material than in springs of the ordinary shape and the tempering of the
spring would be improved, it would therefore be less liable to fracture.
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 coiled or spiral spring formed from a bar of metal having substantially
the form herein shown and described.
2. A coiled or spiral spring formed from a bar of metal having substantially
the form of the various springs forming what is known as a "nest" spring, the
vertical cross section of the inner part being smaller than that of either of the
other parts, which latter are of larger vertical diameter, the outer one being the
largest, the various parts being connected together by small hollow curved webs,
substantially as herein set forth.
101 T1000
HARRIS & MILLS,
23, Southampton Buildings, London, W.C., Agents.