Yielding Power-Coupling Page: 4 of 6
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879,286
dotal driving strain of the car, which strain,
in large cars, may amount to one hundred
horse-power or more.
it will be understood, of course, that no
5 attempt is made in the drawing to show
proper proportions, but the nut will b6 of such
length as to include a sufficient number of
balls to give a safe bearing area for any strain
which may be brought to bear thereon. It
10 will also be understood that the end threads
of the nutbecome gradually deeper until
when they reach the passages 18 the move-
ment of the balls, therethrough is easy and
the crossing of the grooves 19 at the point 20
15 insures an interchange of the balls so that all
the balls will eventually follow all the threads
during the movement of the nut. This
insures equal wear on both the balls and the
threads and maintains the balls all of the
20 same size. /
The end of the cylinder 6 remote from the
. neck 7 is closed by a screw-plug 21 ending in
a cap 22 abufting- against the end of the
cylinder 6. This cap may be polygonal for
25 the application of a suitable tool to screw it
into place or unscrew it therefrom and the
direction of the. threads on the plug 21 may
be such that the rotation of the shaft 2 will
always tend to tighten the plug in its seat,
30 thus avoiding any danger of loosening this
part of the structure and doing away with
the necessity of any special fastening devices.
The center of the plug is bored out axially
for the passage of the shaft 2, and key-ways
35 are provided in the plug 21 for spines 23
carried by the shaft 2. These splines are -of
sufficient length to always engage in the key-
ways in the plug as the plug is moved longi-
tudinally on the shaft in a manner which
40 will hereinafter appear.-
Between the head 3 on the end of the shaft
2 and the inner end of the plug 21 there is
confined a heavy helical spring 24, or, when
necessary, more than one spring may be used
45 at this point, the spring 24 being indicative
of either.one or a number of springs.
The cylinder 6 is supported in an annular
head 25 formed on one end of a bracket 26
coming from any suitable fixed portion of
50 the structure to which this invention is
applied. This head is bored out to receive
a number of rings 27 confined in the head 25
by a nut 28 screwed into one end of the bored
out portion of the head 25. Between the
55 corresponding end of the interior of the head
25 and the adjacent ring 27, and also between
the meeting facesof adjacent rings, and of the
nut 28 and the, ring next to it, are formed
ball-races 29 filled Wiith hardened steel balls
oo 3() bearing upon the exterior of the cylinder
6. Between the head of-the nut 28 and the
adjacent wall of the hearing head 25 there.
are interposed a number of thin, washers 31
which may be removed.from time to time to
5 permit the taking up of wear between theballs and the ball-races. The nut or adjust-
ing ring 28 may be provided with suitable
set-screws for retaining it in any adjusted
position, but such means being a very com-
mon expedient for this purpose are not shown 70
in the drawings.
The exterior of the cylinder 6 may be pro-
vided with a hardened wearing sleeve upon
which the balls 30 may travel, and the in-
terior of said cylinder may also be provided 75
with a hardened wearing sleeve upon which
the balls 4 may travel, and the races for the
balls 4 9tnd 30 may also be formed of inserts
of hardened metal, but these being structural
details are not shown in the drawings. 80
Now, let it be assumed that the shaft 1 is
being rotated at constant speed by a source
of power ample for the purpose. The ex-
pansive' force of the spring 24 maintains the
nut 13 in the taper portion of the cylinder 6. 85
Let it further be assumed that there is no
load capon the shaft 2 and that the con-
tiguous ends of the shafts 1 and 2 are at the
end of the cylinder 6 close to the nut 13 with
the spring 24 expanded. This will mean 9o
that the .cylinder 6 has moved to the right
as viewed in Fig. 1 until the nut 13 is about
coincident with the left-hand end of the head
25. The two shafts are now rotating syn-
chronously and the cylinder 6 is also rotating 95
because of the connection with the shaft 2
through the plug 21 and splines 23. Now,
if under these circumstances t load be placed
upon the shaft 2, the latter will be either
partially or wholly held against, rotation, 100
depending on the load. The result of this is
that the cylinder 6. will be correspondingly
held against rotation' and the threaded por-
tion 12 of the shaft 1 will begin to screw into
and through the nut 13, causing the latter 105
to engage more tightly into the taper por-
tion 14 on the interior of the cylinder 6 and
to pull the said cylinder 6 toward the left as
viewed in Fig. 1. This longitudinal move-
ment of the cylinder .6 proceeds until the iio
spring 24 is compressed to such an extent as
to equal the load upon the shaft 2 and the
latter will then rotate, if, at the beginning of
the operation, it was standing still. Under
this latter supposition the starting torque is, 115
of course, greater than the load after the shaft
has come up to speed, and, therefore, the
i reaction of the spring 24 will cause the re-
turn of the cylnder 6 for.a distanoe util the
parts are aga in equilibrium. Ay vari- I20
ation in the lowa: while the parts are ruirmng
will be quickly responded to by the device,
since it is very sensitive to any variation.
But there is always sufficient time element
entering into the response of the device to .125
changes of load to prevent shocks or jars'to
the driving or driven machinery. > In other
words, there is a certain.elasticity or flexibil-r
ity of grip between the driving element bnd
the driven element sufficient to absorb all 130a3
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Reference the current page of this Patent.
Mayo, William C. & Houlehan, John. Yielding Power-Coupling, patent, February 18, 1908; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth511560/m1/4/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.