Improved Brake for Bioyoles and similar Vehicles.
Year: 1897

page_text: Date of Application, 27th Mar., 1897-Accepted, 26th June, 1897
Improved Brake for Bioyoles and similar Vehicles.
We, THE GOOLD BICYCLE COMPANY, LIMITED, of corner King and Colborne
Streets, in the City of Brantford, in the County of Brant, and Province of Ontario,
Canada, Manufacturers, and WILLIAM SANFIELD WILSON of the same place,
Manufacturer, 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 :-
The object of the invention is to devise a light, compact, simple and efficient
brake which can be put into action by the pressure of back pedalling, and it consists,
essentially, of a stationary friction drum carried by the axle of the rear wheel, and
a band adapted to move a set of rollers or their equivalents up inclined planes when
back pressure is applied to the driving sprocket so as to produce friction against
the inside of the said drum, the whole being constructed in detail substantially as
hereinafter more specifically described and then definitely claimed.
Figure 1, is a perspective view showing the improved brake partially broken
away to show the interior construction ;
Figure 2, is a sectional front elevation of the same;
Figure 3, is a side elevation of the same partially in section;
Figure 4, is a side elevation of a portion of an alternative form of the invention.
In the drawings, like letters of reference indicate corresponding parts in the
different figures.
A, is the hub of the rear wheel, on which is loosely sleeved the sprocket wheel B.
Surrounding the hub, outside the sprocket wheel, is a divided friction band C,
which has a lug a formed thereon which fits into a correspondingly-shaped recess
in the sprocket wheel B.
D, is a flanged washer screwed within the end of the hub A, and bearing against
the split friction band C, so as to retain it in position.
The sprocket wheel B, is held in place on the inner side by means of a ring E,
formed on or connected to the hub.
F, is friction drum sleeved upon the axle G, its rim benclosing the divided
friction band C, and extending inwardly close to the sprocket wheel B. As will
be seen from the drawing, the friction band and friction drum are barely in contact
under normal conditions. The end of the friction drum is in contact with the
cope H, so that the frame I, may be clamped securely between the drum F, and
the nut J. K, is the pin formed on or connected to the drum F. This pin normally
lies against a portion of the frame I, as shown, to prevent the drum being rotated
in the direction in which the hub may be moving. If desired, the pin may be
fitted into a slot, though the construction shown is sufficient for ordinary purposes.
L, are a series of small rollers set half in recesses c, formed in the friction
band C, and partly in recesses d, formed in the hub A. Each recess d in the
hub is formed with an inclined plane e, extending from its bottom to the surface
of the hub in a direction reverse to that of the movement of the hub. From
this construction it follows that the friction band and the hub will revolve as
one when power is applied to the sprocket wheel to drive it in the direction
indicated by arrow.
If, however, the strain is reversed as in the action of back
pedalling, the rollers L, will ride up the inclined planes e and force the friction
band C, into close contact with the inside surface of the rim b, of the drum F,
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page_text: thus applying a very efficient brake to prevent the continued rotation of the
hub a, and consequently of the wheel of which it forms a part. The force
with which the split friction band C, is pressed against the rim of the friction
drum, depends partly on the strength with which the rider of the wheel back
pedals and partly on the angle of the inclined. plane e, which angle may be varied
to suit different conditions. It is evident that the rollers L, may be made
integral with the friction band, or that the inclined planes e, might be formed
on the friction band if so desired, but all such variations would fall within the
scope of the invention.
The band C, in this brake performs two functions:-First-that of moving the
rollers L, up the inclined planes e, and second-that of taking the wear caused
by friction against the drum. The first function is the most important, and it
will be as effectively performed if the band be divided between each pair of
rollers (see Fig. 2) as if divided at one point only as in Fig. 1. The second
function not being so important, the band C, may be so constructed as to
permit the rollers L, themselves, to come into contact with the inside surface
of the drum. This form is shown in Fig. 4, where slots are cut through the
band through which the rollers may play. It is evident that motion of the
band in the direction indicated by arrow, will cause the balls or rollers to press
upon the drum, whereas motion of the band in the other direction will lock the
band and the hub together so that they will revolve as one. If the band is
divided in more than one place as in Fig. 2, no space must be left between any
of the divisions, otherwise lost motion would occur.
It is further evident that the brake might also be applied to a crank axle with
merely such variations as would require the skill of an ordinary mechanic to
devise.
From the above description it will be seen that the brake is exceedingly
simple, light and strong, and also that it applies no strain whatever upon the
bearings, the only effect of its application being to put a twisting strain upon
the hub and the wheel. As it is applied simply by the action of back pedalling,
uo unsightly or cumbersome gear is required for its operation, and any degree
of friction may be obtained between the friction band and the drum so as to
either merely retard the motion of the wheel or stop its rotation entirely.
Having now particularly described and ascertained the nature of the said inven.
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1. In a brake for bicycles and similar vehicles, a stationary friction drum carried
by the axle of the rear wheel, in combination with a divided friction band supported
by the hub; a sprocket wheel loose on the hub and connected to a portion of the
divided band, and rollers lying partly in recesses in the hub and adapted to be
moved up inclined planes by the action of back pedalling so as to produce friction
against the inside surface of the drum, substantially as and for the purpose
specified.
2. In a brake for bicycles and similar vehicles, a stationary friction drum carried
by the axle of the rear wheel, in combination with a divided friction band supported
by the hub; a sprocket wheel loose on the hub and connected to a portion of the
divided band, and rollers lying partly in recesses in the hub and adapted to be
moved up inclined planes by the action of back pedalling so as to produce friction
against the inside surface of the drum, and to lock the band and the hub together
when the machine is being driven, substantially as and for the purpose specified.
3. In a brake for bicycles and similar vehicles, a stationary friction drum carried
by the axle of the rear wheel, in combination with a divided friction band supported
by the hub; a sprocket wheel loose on the hub and connected with the said friction
band; projections formed on or inserted in the inner surface of the friction band,
and each adapted to enter a recess cut in the surface of the hub to form a shoulder
and an inclined plane, substantially as and for the purpose specified.

page_text: 4. In a bicycle, an axle and a stationary drum carried by the said axle, in
combination with a hub and a divided friction band supported by the hub; a sprocket
wheel loose on the hub and connected with the said friction band; and one or
more rollers lying partly in recesses in the said friction band and partly in recesses
in the hub; an inclined plane being formed leading from the bottom of each recess
in the hub to its surface, substantially as and for the purpose specified.
5. In a bicycle, an axle and a stationary drum carried by the said axle and provided
with a pin adapted to engage with a portion of the frame, in combination with a
hub and a divided friction band supported by the hub; a sprocket wheel loose on
the hub and connected with the said friction band; and one or more rollers
lying partly in recesses in the said friction band and partly in recesses in the hub;
an inclined plane being formed leading from the bottom of each recess in the hub
to its surface, substantially as and for the purpose specified.
6. In a bicycle, an axle and a stationary drum carried by the said axle, in
combination with a hub and a divided friction band supported by the hub; a
flanged washer screwed within the hub and adapted to retain the said band upon
the hub; a sprocket wheel loose on the hub aud connected with the said friction
band; and one or more rollers lying partly in recesses in the said friction band
and partly in recesses in the hub, an inclined plane being formed leading from the
bottom of each recess in the hub to its surface, substantially as and for the purpose
specified.
7. In a bicycle, an axle and a stationary drum carried by the said axle, and
provided with a pin adapted to engage with a portion of the frame, in combination
with a hub and a divided friction band supported by the hub; a flanged washer
screwed within the hub and adapted to retain the said band upon the hub; a
sprocket wheel loose on the hub and connected with the said friction band; and
one or more rollers lying partly in recesses in the said friction bands and partly in
recesses in the hub, an inclined plane being formed leading from the bottom of
each recess in the hub to its surface, substantially as and for the purpose specified.
Dated this 27th day of March 1897.
BOULT & WADE,
Agents for the Applicant.