Improvement in Vehicle-Springs. Page: 2 of 2
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UNITED STATES PATENT OFFICE.
JOHN D. RICHARDSON, OF HOUSTON, TEXAS, ASSIGNOR TO HIMSELF AND
JOSEPH RICHARDSON, OF CINCINNATI, OHIO.
IMPROVEMENT IN VEHICLE-SPRINGS.
Specification forming part of Letters Patent No. 153,612, dated July 28, 1874; applieation filed
February 10, 1l74.To all whom it may concern:
Be it known that I, JOHN D. RICIHARDSON,
of Houston, Harris county, State of Texas,
have invented a certain new and useful Imn-
provement in Springs for Carriages or other
uses, of which the following is a specification:
My invention relates to the construction of
metallic springs, and has for its object such
a construction as will provide for great flexi-
bility and diminished friction of the parts.
It is well known that in metallic springs
composed of separate leaves, joined in the
usual way at the center, with freedom neces-
sary for end play of the leaves, a certain
amount of rubbing action between the leaves
is inevitable and deleterious to a free flexibil-
ity of the spring. My invention is designed
to remedy these evils; and it consists of a.
spring formed by two or more leaves joined
firmly together at both ends, andt left free for
independent action or motion at the ceuter,
the inner and outer leaves being of such for-
mation relatively, that in operation the outer
leaf is nulder compression lengthwise, and the
inner leaf or leaves under tensile strain.
Figure 1 is a perspective view of an ellip-
tical spring embodying mny invention. Fig'. 2
is a perspective view of a spring specially de-
signed for locomotive or car use.
The spring is composed of outer leaf or
leaves A and inner leaf or leaves B. The
leaves are joined together at the ends either
by welding, as shown at one end of Fig. 1, or
by banding, as shown at the other end of Fig.
1, in the latter case it being desirable to lap
the ends of the inner leaf over the ends of the
outer leaf, as shown, so that they may have
nl motion at thie ends. The outer leaf or leaves
may be secured to the vehicle in any preferred
uannrer, anrd the inner leaves must at the
center be unattached to the outer ones, so asto have free independent action. The outer
leaves may be of any preferred form or con-
struction so long as they are adapted under
the weight to which they are subjected to im-
part a tensile strain to the inner leaves, and
the inner leaves are preferably of cyni-reversa
curvature, as shown. A form best adapted
for elongation under tensile strain I have
found to be the one shown. Under heavy
strains the inner leaves are permitted to elon-
gate so fiar as to form chords to the are of the
outer leaves, which is the limit inward to the
flexibility of the spring.
It will be seen in the motion of the spring
that the inner leaves have a motion whose ex-
tent is different and independent of the mo-
tion of the o aterleaves, and that tihereis no rub-
bing contact between them.
If preferred, the leaves may be curled over
each other at the ends to form the end june-
tion, and the parts of the vehicle may be at-
tached to the eyes thus formed by the curling
of the ends, as in ordinary vehicle connections.
I claim-
1. A spring the inner leaves B of which
are rigidly secured to the outer leaves A at
the ends only, so that the inner leaves may
act as flexible tensile braces, snustantially as
specified.
2. A spring the inner leaves B of which are
rigidly secured to the outer leaves A, the in-
ner leaves being of cyma-reversa form, sub-
stantially as shown, and for the purpose speci-
fled.
In testimony of which invention I hereunto
set my hand.
JOHN DUNN RICHARDSON.
Witnesses:
J. C. LORD,
SARAH N. LoRD.
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Richardson, John D. Improvement in Vehicle-Springs., patent, July 28, 1874; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth166987/m1/2/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.