Certain Improvements in Brakes for Pneumatic Tyred Velocipedes, Motor Cars and Vehicles.
Year: 1897

page_text: Date of Application, 1st Apr., 1897
Complete Specification Left, 3rd Jan., 1898- Accepted, 12th Mar., 1898
PROVISIONAL DE DUIFICATION.
Certain Improvements in Brakes for Pneumatic Tyred Velocipedes,
Motor Cars and Vehicles.
We, JAMES BUNN and CHARLES WILLIAM BUNN, both of Herbert Street, West
Bromwich, in the County of Stafford, Carriage Fittings Manufacturers, and
THOMAS BRETTELL, of Walter Street, West Bromwich, aforesaid, Engineer, do
hereby declare the nature of this invention to be as follows:
This invention of improvements in brakes for pneumatic tyred velocipedes
motor cars and vehicles has reference to those brakes in which two rollers are
employed to form the brake surface for acting on the pneumatic tyre these rollers
being mounted to revolve on a common axle which passes through the centre of
both rollers and is carried by a stem or arm so as to be at right angles to the plane
of the wheel with which the brake is used.
This invention consists in constructing and mounting the said rollers in the
manner herein described so that as they are pressed against the pneumatic tyre in
the usual way with a gradually increasing pressure they will at first revolve on
their axle and then be gradually brought to rest thus forming a gradual brake on
the pneumatic tyre and preventing undue wear on the same.
In carrying out this invention the two rollers are made somewhat of a truncated
conical form with their smaller ends meeting at about the central plane of the
wheel and their bases arranged towards the ends of the axle pin on which the
rollers revolve the rollers being by preference shaped to conform with the curved
shape of the tyre. The said axle pin is carried by a fork the sides of which are by
preference of about the same size as the bases of the conical rollers and are situated
at a short distance therefrom when the rollers are in their normal position pressed
together by coiled wire springs which we provide inside the rollers on the axle pin.
The faces of the rollers are by preference covered with india rubber or are other-
wise formed so as to give an increased frictional surface when brought into con-
tact with the sides of the fork as hereinafter described.
The brake above described acts as follows:-When the rollers are pressed against
the pneumatic tyre of the revolving wheel they are by the tyre caused to revolve
upon their axle pin and as the pressure of the rollers upon the tyre increases the
said rollers are by the tyre forced apart slightly so that the bases of the rollers
come in contact with and are pressed against the sides of the fork and by the
friction set up between the bases of the rollers and the said sides of the fork the
rollers are arrested and they cease to revolve and thus form an increased frictional
brako surface against the pneumatic tyre. The coiled wire springs which press
the rollers together as aforesaid are by preference contained in tubular sleeves
arranged on the axle pin within the rollers these sleeves fitting in the sides of the
fork and on to the tubular metal bushes in the rollers so as to enclose the springs
and prevent mud and dirt from getting to the springs and bearings of the rollers.
Dated this 27th day of March 1897
CHARLES BOSWORTH KETLEY,
Agent for the Applicants.

page_text: Certain Improvements in Brakes for Pneumatic Tyred Velocipedes,
Motor Cars and Vehicles.
We, JAMES BUNN and CHARLES WILLIAM BUNN, both of Herbert Street, West
Bromwich, in the County of Stafford, Carriage Fittings Manufacturers, and
THOMAS BRETTELL, of Walter Street, West Bromwich, aforesaid, Engineer, 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:
This invention of improvements in brakes for pneumatic tyred velocipedes motor
cars and vehicles has reference to those brakes in which two rollers are employed
to form the brake surface for acting on the pneumatic tyre these rollers being
mounted to revolve on a common axis which passes through the centre of both
rollers and is carried by a stem or arm so as to be at right angles to the plane of
the wheel with which the brake is used.
This invention consists in constructing and mounting the said rollers in the
manner herein described so that as they are pressed against the pneumatic tyre in
the usual way with a gradually increasing pressure they will at first revolve on
their axle and then be gradually brought to rest thus forming a gradual brake
on the pneumatic tyre and preventing undue wear on the same.
We will describe this invention by referring to the accompanying drawings on
which Fig. 1 is a side elevation of the head and part of the front wheel pneumatic
tyre of a safety bicycle with our improved brake applied said brake being shewn
in section; Fig. 2 is a front view and Fig. 3 is a plan of the said brake; Fig. 4
is a front sectional elevation of the brake shewing also the pneumatic tyre in cross
section; Fig. 5 is a front elevation illustrating the action of the said brake;
Fig. 6 is a front elevation and Fig. 7 is a side view of the fork which carries the
rollers and axle pin of the brake; Fig. 8 is a sectional elevation and a side eleva-
tion of one of the said rollers of the brake; Fig. 9 is a sectional elevation and an
end elevation of the bush of the roller; Fig. 10 is a side elevation and end view
of the axle pin and spring guide and Fig. 11 shews one part of the roller springs
of the said brake separately.
The same letters of reference indicate the same parts in all the figures.
In carrying out this invention the two rollers A¹ As are made somewhat of a
truncated conical form with their smaller ends a¹ a¹ almost meeting at about the
central plane of the wheel and their bases a² a² arranged towards the ends of the
axle pin B on which the rollers A¹A³ revolve, the rollers being by preference
shaped as shewn to conform with the curved shape of the pneumatic tyre C. The
axle pin B is carried by a fork D at the bottom of the brake plunger E which has
an up and down movement imparted to it as usual by the usual hand lever or other
means. The sides of the fork D are by preference of about the same size as
the bases as a² of the conical rollers A¹ A2 and are situated at a short distance there-
from when the rollers are in their normal position shewn in Figs. 2, 3 and 4
pressed towards each other, by the coiled wire springs F¹F which we provide
inside the rollers A¹ A2 on the axle pin B. The rollers A¹ A° are by preference
made of india rubber or are otherwise formed so as to give an increased frictional
surface when brought into contact with the sides of the fork I) as hereinafter
described and they have internal metal bushes H¹H³ which turn freely on the axle
pin B.
The coiled wire springs F1 F2 which press the rollers A¹ A² together as aforesaid
are by preference contained in the tubular sleeves G₁ G arranged on the axle pin B

page_text: within the rollers A¹ A³ these sleeves G¹ G fitting in the sides d¹d of the fork D
and on to the tubular metal bushes H¹ H2 in the rollers A¹ A² (see Fig. 4) so as
to enclose the springs FF and prevent mud and dirt from getting to the springs
and bearings HH of the rollers A¹ A².
The brake above described acts as follows:-When the rollers A¹ A² are pressed
against the pneumatic tyre C of the revolving wheel they are by contact with the
tyre caused to revolve upon their axle pin B and as the pressure of the rollers A¹ A²
upon the tyre C increases the said rollers are by the tyre forced apart slightly
against the pressure of the springs FF so that the bases a² a of the rollers come
in contact with and are pressed against the sides of the fork as shewn in
Fig. 5 and by the friction set up between the bases aa³ of the rollers and the
sides d' of the fork D the rollers A' A² are arrested and they cease to revolve and
thus form an increased frictional brake surface against the pneumatic tyre C.
When the brake is raised the rollers A1 A2 are by the springs FI F3 moved towards
each other again as shewn in Figs. 2, 3 and 4.
In order to prevent the brake plunger from turning and the brake rollers A¹ A³
getting askew with the tyre, we prefer to connect the axle pin B (see Figs. 1 and 3)
to a bracket or plate I (which is fixed to the top of the front steering fork) by the
link J which is situated between the two rollers A' A² and through which the axle
pin B passes, the other end of this link J being jointed at ¹ to the end of the
bracket or plate I.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is :-
1. In a brake for pneumatic tyred velocipedes motor cars and vehicles the
employment of two truncated conical or approximately conical rollers mounted to
revolve on a common axis between the sides of a fork and so arranged that when
the rollers are pressed against the revolving pneumatic tyre with a gradually
increasing pressure the rollers at first revolve on their axle and are afterwards
gradually brought to rest by the tyre forcing them apart against the sides of the
fork thus forming a gradual brake on the pneumatic tyre, substantially as
described.
2. A brake for pneumatic tyred velocipedes motor cars and vehicles constructed
arranged and operating substantially as herein before described and illustrated by
the accompanying drawings.
1
L
01.1
11007
CHARLES BOSWORTH KETLEY,
Agent for the Applicants.