A New or Improved Intertwined Twin Spiral Non-vibration Spring for Railway and other Vehicles.
Year: 1895

page_text: Date of Application, 8th Nov., 1895
Complete Specification Left, 8th Aug., 1896-Accepted, 26th Sept., 1896
PROVISIONAL SPECIFICATION.
A New or Improved Intertwined Twin Spiral Non-vibration Spring
for Railway and other Vehicles.
I EDMOND JOSEPH FREWEN, of 34 Dawson Street, Dublin, Ireland,
Accountant, do hereby declare the nature of this invention to be as follows:-
11
This invention has for its object a new or improved intertwined twin spiral
spring for railway or other vehicles and is designed to afford greater elasticity
combined with more durability than any spring hitherto used so far as I am
aware.
In carrying out my invention I propose to arrange or intertwine two spiral
springs of suitable length, diameter and thickness, made of steel or other such
metal, in such a manner that each spring will present a helix to the opposing helix
of the other, the convolutions of both spirals travelling around the same axis,
though in different directions, with the apex of each approaching the base of the
other. Between the respective convolutions I propose to insert a band or pads of
india-rubber or other suitable substance; or I may use for this purpose a length
or lengths of inflated tube which will entirely fill up the interstices between the
springs, and overlap same so as to prevent either coming into contact with the
other, the whole forming a solid column in which the springs are separated one
from the other by a non-vibratory substance.
In applying the combined spring thus produced it is proposed to secure the base
of one to the axle of the vehicle, and the base of the other spring to the body of
the vehicle so that the weight of the vehicle pressing down through the convolu-
tions will be evenly resisted and pressed back through the opposing convolutions of
the spring thus giving double elasticity, while the rubber being between will
prevent vibration being transmitted to the body proper of the vehicle.
The spring may be enclosed in a suitable box or case rigidly attached to the
axle, but removable at will, to serve as a protection against mud or dust and also
to act as an all round stay or support.
Dated this 7th day of November 1895.
J. K. FAHIE & SON,
9 Westland Row, Dublin, Agents for Applicant.
A New or Improved Intertwined Twin Spiral Non-vibration Spring
for Railway and other Vehicles.
I, EDMOND JOSEPH FREWEN of 34 Dawson Street, Dublin, Ireland,
Accountant, 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 has for its object a new or improved intertwined twin spiral
spring for railway or other vehicles and is designed to afford greater elasticity
combined with more durability than springs hitherto used so far as I am aware.

page_text: In carrying out my invention 1 propose to arrange or intertwine two spiral
springs of suitable length, diameter, and thickness made of steel or other suitable
material, in such a manner that one spring will present a helix to the opposing
belix of the other, the convolutions of both spirals travelling around the same axis
though in different directions, with the apex of each approaching the base of the
other.
Between the respective convolutions I propose to insert a band or pads of india-
rubber or other suitable substance, or I may use for this purpose a length or lengths
of inflated tube which will entirely fill up the interstices between the springs so as
to prevent one coming into contact with the other, the whole forming a solid
column, as regards lateral deflection, in which the springs are separated one from
the other by a non-vibratory substance.
Or the two springs may be used without the intervening substance should it be
found more convenient for the class of work for which the combination may be
used.
In applying the spring thus produced it is proposed to secure the base of one to
the axle or journal of the vehicle, and the base of the other spring to the body of
the vehicle, so that the weight of the vehicle pressing down through the convolu-
tions of the spring attached to the body of the vehicle will be evenly resisted and
pressed back through the opposing convolutions of the spring attached to the axle
or journal, thus giving double elasticity while the intervening pad will prevent
vibration being transmitted to the body proper of the vehicle.
The accompanying drawings will enable my said invention to be more readily
understood and carried into practice.
Fig. 1. is an elevation shewing the two springs without the intervening pad.
Fig. 2. shews the two springs with the intervening pad and
Fig. 3. is a plan view.
Similar letters indicate like parts in each of the views.
A and B indicate the respective springs, one (A) starting from the bottom A'
and terminating at A³, and the other (B) starting from the top B' and terminating
at B.
The intervening elastic substance is indicated by C which may be a solid elastic
cushion or inflated tube, or other suitable non-vibratory material.
This pad may be continuous, or in suitable sections as may be found convenient.
For the purpose of supporting the combination and preventing lateral oscillation
or deflection, a standard D is introduced through the springs, which may be carried
by a suitable plate D' and pass freely through the base as indicated by the dotted
lines so as not to interfere with the vertical oscillation of the springs; or vice versa,
the standard may be attached at the base and pass freely through the top.
The combination may be incased in a suitable detachable chamber or box as a
protection against mud or dust.
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 :-
First. The use and application of two spiral springs intertwined or interwoven
in the manner substantially as herein specified.
Second. The combination formed by two spiral springs with the intervening
elastic substance arranged for the purpose of producing a spring of a non-vibratory
character substantially as herein specified and set forth.
J. K. FAHIE & SON,
9 Westland Row, Dublin, Agents for Applicant.