Nut Lock. Page: 2 of 3
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UNITED STATES PATENT OFFICE.
ELI F. CAMIPBELL, LAROY C. NOBLE, AND MILTON G. HOWE, OF IHOUSTON,
TEXAS.
N UT-LOCK.
SPECIFICATION forming part of Letters Patent No. 301,337, dated July 1, 1884.
Application filed arch 17, 1884. (No model.).'o all whon it mnay concern:
Be it known thliat we, ELI F. CAMIPBELL,
LAROY C. NOBLE, and MILTON G. HOWE, citi-
zens of the United States, residing at Hous-
5 ton, in the county of Harris and State of Texas,
have invented new and useful Improvements
in Nut-Locks, of which the following is a speci-
fication.
The present invention relates to that class
to of nut-locking washers which are in the form
of volute springs, and are fitted on the bolts
between the nuts and fish-plate or other ob-
jects held by said bolts and nuts.
The object of the invention is to obtain a
x5 spring-washer of great stiffness and strength
which will permanently retain its elasticity
and exert a sufficient friction or resistance be-
tween the surface of the spring and nut to
positively prevent the turning of the latter.
20 To this end the invention consists of a vo-
lute spring-washer which is formed of a stiff
or strong steel plate that is coiled or set up in
in an edgewise manner, and is provided with
one or more projections or spurs on its top
25 and bottom surfaces, adapted to engage with
the under side of the nut and the fish-plate
or other object, said spurs or projections be-
ing formed on the top and bottom edges of the
inner and outer coils of the spring-washer, all
30 as will be hereinafter more fully described,
and then set forth in the claim.
In the drawings, Figure 1 is a transverse
section of a rail-joint, showing our volute
spring - washer interposed between the nut
35 and fish-plate, said washer having spurs or
projections which engage with the under side
of the nut and with the fish-plate. Fig. 2 is
a perspective view of our spring-washer, and
Fig. 3 is a top view of the same.
40 We construct our volute spring-washer A
of a flat steel plate, which is made of a suffi-
cient width and thickness to give the finished
washer the desired degree of stiffness and
strength. This steel plate is coiled in an edge-
45 wise manner upon a suitable mandrel, so as tocause the top and bottom edges of the plate to
form the surfaces which are in contact with
the nut and the fish-plate of a rail-joint or
other object to be secured.
The washer is, by the particular manner 50
in which its convolutions are made to run,
given a larger diameter at one end than at the
other, and this larger portion is usually the
base of the washer, or surface that rests in con-
tact with the fish-plate or other object to be 55
secured.
One or more spurs or projections, a, are
formed on the top edge of the inner coil or
convolution of the washer, and a similar spur
or spurs, b, are formed on the bottom edge of 6o
the outer coil of the washer. These spurs are
produced by cutting the metal of the washer
with a suitable chisel at a point beyond the
ends of the respective coils, and said spurs
are so shaped or turned as to point in the di- 65
rection in which the nut is turned in fitting or
screwing it on the bolt.
A single spur will generally answer for in-
suring a firm engagement between the washer
and nut, it being obvious that the spur is 70
caused to be embedded in the under side of
the nut when the latter is screwed home, and
in this manner the loosening thereof by jars
or accidental causes is effectually prevented.
The lip on the base of the washer is designed 75
to enter the metal of the fish-plate for locking
the washer thereto.
A volute spring-washer made as above de-
scribed can be easily and cheaply manufac-
tured, and possesses such a degree of elastic- 8o
ity, strength, and rigidity that it will always
be in condition to take up the wear caused by
the abrasion of the fish-plates or other mem-
bers of a rail-joint. In this manner the bolts
are prevented from rattling, and are always 85
held tight by the action of the spring-washer.
We are aware that a volute conical spring
formed of round or square metal wire has
heretofore been employed as a nt -locking
washer; and we are also aware that a spring- 90o
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Campbell, Eli F.; Noble, Laroy C. & Howe, Milton G. Nut Lock., patent, July 1, 1884; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth170768/m1/2/: accessed March 18, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.