Year: 1887

page_text: Date of Application, 9th Nov., 1887
Specification Accepted, 9th Dec., 1887
I JAMES MCHARDY of Dollar N.B. Scientific Expert 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 :-
This Invention, which relates to India rubber Springs, has for its object the
construction of a rubber spring which shall be capable of being held or fixed at
the ends in such a manner as to avoid compression at any point of the more stretching
part of the spring.
In carrying this Invention into practice, I construct an India rubber Spring, so
thickened at the ends as to be capable of being held securely, in a cup or other
suitable attachment, through which the thickened part of the spring cannot escape,
but which may yet be large enough not to compress the stretching or middle part of
the spring; or, as my object is to obtain the maximum of wear out of the said spring,
by any thickening of the ends which shall enable me to fix the said spring, and
at the same time shall avoid the compression or undue friction at all points of the
thinner or more stretching part of the spring, I may, according to circumstances, use
any means of fastening, notwithstanding a preference for the arrangement of parts as
set forth in the accompanying Drawings.
Fig. 1
A
BB
C C
D D
HH
II.
-
-
-
=
-
Section of a round rubber spring (thickened at the ends) with suitable
fastenings.
Spring terminating in
the thickened ends as represented by dotted lines.
Hollow globe-like fastenings with
Eyelets and
Holes in the sides of the fastenings, through which B B may be forced
into the cavity.
Slot-like openings through which the thinner part of A may be forced
simultaneously with the entrance of B. B. through H. H.
Now as C C are provided with round holes, with an entrance (through I I) which is
less than their diameter, it is obvious that (the spring having been inserted) if the
fastenings be drawn in opposite directions by means of the Eyelets (D D) the
thickened ends of the spring will be held by the shoulders of the beforementioned
Prine hd1

page_text: holes, and the thinner part of the spring shall have free action, without, in any way,
being compressed, i.c. the compression will be, only upen the thickened onde which
will yield but slightly in proportion to the spring proper.
being compressed, 1.c. Comp
will yield but slightly in proportion to the spring proper.
Fig. II
A
=
=
A section of suitable fastenings with a flat Indiarubber spring.
the edge of rubber web with
BB the thickened ends.
D. D.
00
1
-
=====
Eyelets or suitable bearings for hinges.
Clip-like fastenings with openings (of the same size as B B) into which
these (BB) are inserted sideways, and in which the rubber may be
prevented from slipping out, either by its tightly fitting, or by suitable
stops.
Just as the round rubber spring (Fig. I) is held as if by a circular dove-tailing, so in
this (Fig. II) the flat spring is held as if by a transverse dovetail, the edges of the
hollow pressing only upon the thickened part of the rubber.
The essential feature of this Invention being the thickening of the ends of the
spring, it is obvious that apart from these special forms, I am entitled to claim any
thickening of the ends that shall by superior strength, take up the tear and wear for
the portion which is, practically, the spring..
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.) That enlargement at the ends of India rubber springs which enables me to
remove the compression from the active part of the spring to a stronger portion of its
own material, as herein described and particularly set forth by the accompanying
Drawings.
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