Improvements in Bicycle Brakes and Driving Mechanism.
Year: 1898

page_text: Date of Application, 13th Dec., 1898-Accepted, 18th Mar., 1899
COMPLETE SPECIFICATION.
Improvements in Bicycle Brakes and Driving Mechanism.
We, VICTOR EMANUEL DOREMUS, Inventor, of 164, West 23rd Street, New York,
PATRICK THOMAS WALL, Hotel-keeper, of 342, West 56th Street, New York, and
HENRY AUGUSTUS SIEBRECHT, Florist, of New Rochelle, all in the State of New
York, United States of America, 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:-
as
-
This invention relates to an improvement in bicycle brakes of the type known
back pedaling brakes," and has for its object the construction of a device
of this character adapted to be used as a coaster permitting the driven wheel to
run freely while the pedals are held stationary, to apply the brake by the action
of back-pedaling and to be locked so that the coaster and brake mechanism is
rigidly connected with the driving gear as in the ordinary type of sprocket and
chain gear.
The invention consists in the novel construction and combination of the several
parts as will be hereinafter fully described and specifically set forth in the annexed
claims.
In the accompanying drawings:
Figure 1 is a side elevation of the device partly sectional and with the left
crank removed.
Figure 2 is a cross sectional view on the line - of Fig. 1.
Figure 3 is a sectional view of the locking device of the coaster and brake
mechanism; and
Figure 4 is a side elevation of the coaster disc with the crank attached thereto,
said crank being partly broken away.
In the application of our invention, we employ a crank shaft 1 revolubly
At a point immediately
mounted in the usual manner in the crank hanger 2.
outside of the cone 3 and the crank hanger bearing, a disc 5 is fixed to the shaft.
This disc may be formed integrally with the cone 3 or may be attached to the
shaft separately as preferred. The periphery of this disc is provided with a screw-
thread 6 and with an outwardly projecting annular ring 7, the inner periphery 8
of which is inclined and adapted to form one part of the ball race of the coaster.
An annular right-angular ring 9 is adapted to screw upon the outer periphery
of the disc 5 and the radial portion of this ring is provided with an inclined
face 10 at its inner periphery adapted to form in conjunction with the inclined
A lock-
face of the disc 5 an adjustable side for the ball race of the coaster.
nut 11 is adapted to thread upon the outer periphery of the disc 5 and hold the
ring 9 securely in position as adjusted.
Loosely mounted upon the shaft outside of the disc 5 is the body portion 12
of the sprocket, provided upon its inner face with two concentric rings. The
innermost of these rings, 13, is provided upon its outer periphery with a V-shaped

page_text: channel 15. A series of balls 16 are mounted in this V-shaped channel and
between it and the inclined faces of the disc 5 and the adjusting ring 9, the
whole forming a single ball bearing in line with the strain of the chain and
sprocket.
The inner periphery of the ring 13 is provided with a series of pockets 17
having one radial shoulder 18 and one inclined shoulder 19.
The outer ring 20 projects over the adjusting ring 9 and is adapted to exclude
dust from the bearing.
A collar 21 is fixed upon the shaft between the disc 5 and the main portion 12
of the sprocket. This collar may be brazed or otherwise fastened to the shaft
independent of the dise 5 or may be formed integrally therewith as preferred.
The collar is provided with a series of radial recesses 22. Within these recesses
are carried a series of pins or rollers 23 and each of these pins or rollers are
normally forced outward radially by means of the springs 25. When so forced
outwardly the pins or rollers normally lié partly in the pockets of the sprocket
ring and partly within the recesses of the collar, thereby locking the two together
effectually when the shaft is revolved in one direction. When the shaft is
rotated in the opposite direction however, the pin or rollers are carried to and up
the inclined shoulder of the ring pockets and the ring is thereby unlocked, the
springs holding the pins at all times in contact with the inner periphery of the
socket ring:
When it is desired that the device be used with or without employing the
coasting device, the sprocket 12 is provided with an annular outwardly projecting
ring 26 as best shown in Fig. 4. The crank 27 is attached to the shaft in any
approved manner and 1S provided with a hole 28 in which the
screw 29 is adapted to be passed, this screw threading into a suitable
hole 30 in the ring 26, thereby locking effectually the sprocket to the crank.
When it is desired to use the coasting device, it is simply necessary to remove
the screw from the crank and when this is done, a spring cap of any approved
design may be substituted therefor, the cap being designed to exclude dust from
the whole. A short screw plug may be threaded into the hole 30, said plug may
be adapted to fill the said hole and keep the dirt from clogging therein, said plug
being flush with the outer surface of the ring 26 so that it will not interfere
with the rotation of the sprocket past the boss of the crank. If preferred, the
ring may be dispensed with and the boss of sufficient size to hold the screw 29
securely to the sprocket substituted.
The construction of the brake locking mechanism is the same as that of the
coaster except that it is reversed and locks only during the rearward rotation of
the shaft while the coaster locks only during the forward rotation of the shaft.
The outer shell 31 of the brake-lock is provided with the spur 32 projecting rear-
wardly therefrom. To this spur is pivoted the link 33 which is in turn pivoted
to the angular portion 35 of the brake 36. The angular portion 35 of the brake
is carried inwardly and underneath the chain-stay 37.
The brake 36 is pivoted to a downwardly projecting yoke 38 provided with the
bridge 39 spanning the space between the chain-stay 37 and the chain-stay 40,
its upper surface being concaved to fit the lower half section of these chain-stays.
The clamp 41 has two concaved ends adapted to fit upon the upper sections of
the chain-stays and is provided with an integral bridge connecting same. The
bridge 39 and the bridge portion of the clamp 41 are held together by means of
the screw 42.
A brake shoe 43 is connected to the lower end of the brake arm, preferably
by means of the pivot 44 but may be formed integrally therewith if preferred.
While the brake locking mechanism is shown upon the opposite side of the
crank hanger from the coaster and sprocket, I desire it to be distinctly under-
stood that it may be, if preferred, mounted on the same side as the sprocket and
coaster in which case the collar 21 and disc 5 of the two devices may be formed
integrally in one piece.
f

page_text: Having now particularly described and ascertained the nature of our said in-
vention and in what manner the same is to be performed, we declare that what we
claim is:
1. In a back-pedaling brake, the combination.with the collar 21 having the
radial recesses 22, the sprocket ring 13 having the pockets 17 therein and the pins
or rollers 23 adapted to be held and forced outwardly and radially by the
springs 25.
2. In a back-pedaling brake of the class described, the combination of the
shell 31 adapted to be locked with the shaft only during rearward rotation of the
latter, the spur 32 fixed thereto, the link 33 pivoted to the brake arm 36, said
brake arm being pivoted to the yoke 38 secured to the chain-stays.
3. In a bicycle coaster, the combination of a sprocket loosely mounted upon
the crank shaft and adapted to be locked thereto only during the forward rotation
of the crank shaft, said sprocket being provided with a boss or ring, the crank
provided with a removable screw adapted to be threaded into a suitable hole in
said boss or ring, substantially as described.
4. In a back-pedaling brake, the combination of a brake-operating shell adapted
to be locked to the shaft only during rearward rotation of said shaft, of a sprocket
adapted to be locked to the crank shaft only during forward rotation of said
shaft, the crank carried by said shaft, and means for holding said crank rigidly
to said sprocket, as and for the purpose set forth.
Dated this 12th day of December 1898.
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.