Changeable Gearing. Page: 2 of 3
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UNITED
STATES
PATENT OFFICE.
ALFORD BRADY, OF GALVESTON, TEXAS, ASSIGNOR OF ONE-HALF TO GUS.
REYMERSHOFFER, M. ROSENBERGER, AND M. M. LEVY, OF SAME PLACE.
CHANGEABLE GEARING.
SPECIFICATION forming part of Letters Patent No. 665,594, dated January 8, 1901.
Application filed July 23, 1900, Serial No. 24,546. (No model.)To all whom it imay concern:
Be it known that I, ALFORD BRADY, a citi-
zen of the United States, residing at Gal-
veston, in the county of Galveston and State
5 of Texas, have invented a new and useful
Changeable Gearing, of which the following
is a specification.
This invention relates to changeable gear-
ing adapted for use upon bicycles and simi-
io lar vehicles, although it will be understood
from the following description that the prin-
ciples involved may be utilized in other spe-
cific capacities, one object of the invention
being to provide a construction in which a
5 multiplication of speed may be secured or not,
as may be desired, a further object of the in-
vention being to provide a simple and efficient
means for thus shifting the operative connec-
tion of the mechanism.
20 In the drawings forming a portion of this
specification, and in which like numerals of
reference indicate similar parts in both views,
Figure lis a central section taken through the
crank-hanger of a bicycle and showing, partly
25 in section and partly in elevation, the parts
of the gearing with the crank-axle. Fig. 2 is
a section taken through the crank-axle at one
side of the hub of the stub-shafts thereon and
showing the ratchet connection between the
30 hub and shaft, the bevel-gears being removed
from the shafts.
Referring now to the drawings, 5 repre-
sents the crank-hanger,having the usual disks
6 and 7 engaged with its ends for closing the
35 ends of the hanger and for adjusting certain
bearings. Through the disks 6 and 7is passed
a crank-axle 8, having cranks 9 and 10 fixed
to its ends, and upon the axle and spaced at
opposite sides of the middle point thereof are
40 ratchet-wheels 10 and 11, which are keyed or
otherwise fixed to the axle.
Between the ratchets 10 and 11, mounted
upon the axle 8, is a hub 12, having its ends
countersunk, as shown, to form two annular
45 flanges 13 and 14, which encircle the ratchet-
wheels, and pivoted to the ends of the hub
within the enclosure of these flanges are pawls
15, disposed to cooperate with the ratchets 10
and 11 in such manner that when the crank-
50 axle is rotated forwardly the pawls will en-
gage the ratchets to rotate the hub forwardly,but when the axle is rotated rearwardly or
the hub is rotated forwardly there will be in-
dependent motion between these parts. The
ratchets are disposed in contact with the ends 55
of the hub 12 within the countersinks thereof,
and while they permit rotation of the hub
they prevent longitudinal movement thereof
upon the axle.
Extending radially from the hub 12 and 6o
spaced equidistant are three stub-shafts 16,
17, and 18, each of which has a bevel-gear 19,
rotatably mounted thereon and having ball-
bearings, as shown.
Mounted loosely upon the crank-axle and 65
at opposite sides of the ratchet-wheels are two
bevel-gears 25 and 26, both of which mesh
with the bevel-gears upon the st u b-shafts,
and the hubs of both of which gears 25 and
26 extend exteriorly of the crank-hanger 70
through the disks 6 and 7, the hub of the
wheel 26 having the crank-sprocket 27 en-
gaged therewith, as shown, for rotation there-
by. Bearing-balls disposed between the hub
of the sprocket 27 and a race upon the shaft 75
and between the hub of the gear 26 and the
hub of the ratchet 11 support the gear 26
and the parts carried thereby. The bevel-
gear 25 is supported upon balls disposed be-
tween the outer end of its hub and a race 28 8o
on the crank-axle and by other balls disposed
between the inner end of the hub and the
hub of the ratchet-wheel10, the adjustment
of these several ball-bearings being accom-
plished by manipulation of the adjustable 85
race 29, with which the balls 30 at the outer
end of the hub of gear 26 are engaged.
Within the crank-hanger and fixed to the
outer face of the gear-wheel 25 is a disk 30s,
which lies in a recess of the inner face of the 90
disk 6 and has a perforation 31 formed radi-
ally thereof and adapted to register with a
corresponding perforation 32, formed in the
crank-hanger shell and the flange of the disk
6, so that when it is desired to hold the disk 95
301 from rotation a pin 320 may be engaged
with these perforations, as shown.
With the pin 32a in the position shown in
Fig. 1 of the drawings if the crank-axle be
rotated the gear 25 will be held stationary roo
and the sprocket-wheel will be rotated twice
for each rotation of the axle, thus multiply-
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Brady, Alford. Changeable Gearing., patent, January 8, 1901; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth508294/m1/2/: accessed July 5, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.