Improvements in Coiled Steel Springs.
Year: 1892

page_text: Date of Application, 8th June, 1892
Complete Specification Left, 8th Mar., 1893-Accepted, 15th Apr., 1893
PROVISIONAL SPECIFICATION.
Improvements in Coiled Steel Springs.
I ILLIUS AUGUSTUS TIMMIS. of No. 2 Great George Street, Westminster
London S.W. Civil Engineer, do hereby declare the nature of this invention to be
as follows:-
The objects of my invention are to increase the life and thus lessen the expense
of using coiled springs. With these objects in view I refer to my Patent
No. 95389 wherein I describe and claim the manufacture of steel spiral springs
with two or more thick parts only one of which coming home &c.
I find it advisable to make these springs which have two or more thick parts
in cross section of the bar so that when coiled the different thick parts shall have
a cross sectional area proportional to the distance from the central axis-in other
words the moment of inertia of the thick parts is proportional to their radii from
the central axis to their several centres of gravity. These proportions may not be
mathematically accurate but practically so.
-
The shape of the several thick parts or any of either may be square, round, oval,
rectangular or any other convenient shape and they may be in different planes or
in the same planes.
COMPLETE SPECIFICATION.
Improvements in Coiled Steel Springs.
1 ILLIUS AUGUSTUS TIMMIS of No. 2 Great George Street Westminster
London S.W. Civil Engineer, 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 :-
The objects of my invention are to increase the life and thus lessen the expense
of using coiled springs. With these objects in view I refer to my Patent
No. 95380 wherein I describe and claim the manufacture of steel spiral springs
with two or more thick parts only one of which coming home &c.
I find it advisable to make these springs which have two or more thick parts in
cross section of the bar so that when coiled the different thick parts shall have a
cross sectional area proportional to the distance from the central axis-in other
words the moment of inertia of the thick parts is proportional to their radii from
the central axis to their several centres of gravity. These proportions may not be
mathematically accurate but practically so.
The shape of the several thick parts or any of either may be square, round, oval,
rectangular or any other convenient shape and they may be in different planes or
in the same planes.
The reasons for the above named conditions are that the various thick parts
may do practically equal quantities of work-and the reason why I say that "these
proportions may not be mathematically accurate &c." is because the same bar may
be coiled, for convenience, on different diameter spindles.

page_text: 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 :
In the manufacture of coiled steel springs the use of bars which when coiled
shall have two or more thick parts practically as and for the purposes hereinbefore
described.