Improvements in or connected with Wheel Brakes.
Year: 1895

page_text: Date of Application, 21st Sept., 1895
Complete Specification Left, 22nd June, 1896-Accepted, 29th Aug., 1896
PROVISIONAL SPECIFICATION.
Improvements in or connected with Wheel Brakes.
I, JOHN GEORGE AULSEBROOK KITCHEN of Rose Grove, Ardwick
Manchester in the County of Lancaster, Mechanician, do hereby declare the
nature of this invention to be as follows:-
-
This invention relates to wheel brakes chiefly for road vehicles and consists in
further improvements in the constructive arrangement of pneumatic brakes
described and claimed by me in Specification No. 16581 A.D. 1893 and No. 12526
A.D. 1894.
The improvements refer more particularly to the construction and arrangement
of the block and block carrier and parts thereof, by which improvements the
stability and efficiency of the pneumatic brake is in some cases increased and the
wearing parts may be readily renewed.
The block consists preferably of a dovetail channeled plate into which a shoe
of india rubber or other suitable substance is slid and secured in such a position
that it may by pressure applied thereto be pressed against the rim or tyre of the
wheel.
The block is carried by the block carrier to which it is preferably hinged so that
the block depends from the carrier.
In order that the surface of the shoe sball wear evenly it is preferable to suspend
the block from the upper part of the block carrier by a link or links.
The block carrier is supported and fixed to the body or underframe of the vehicle
preferably by an arm or an equivalent support.
Between the block and the block carrier is disposed a flexible chamber preferably
of india rubber and in a collapsed state of form which is preferably spherical when
expanded by internal pressure and in the form of a cup when in a collapsed state.
The opposing faces of the block and block carrier are suitably formed to seat
the flexible chamber and secure it in position. Into the chamber is led a pipe by
means of which it is inflated, the pipe being carried from the chamber to the foot-
board or other convenient part of the vehicle and connected to a pump which may
be worked by the hand or foot of an operator.
In some cases I may dispose two or more than two collapsable chambers of
suitable form between the opposing faces of the block and block carrier.
Dated this 20th day of September 1895.
Improvements in or connected with
I, JOHN GEORGE AULSEBROOK KITCHEN of Rose Grove, Ardwick,
Manchester, in the County of Lancaster, Mechanician 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 relates to wheel brakes, chiefly for road vehicles and consists in

page_text: further improvements in the constructive arrangements of pneumatic brakes
described and claimed by me in Specification No. 16581 A.D. 1893 and No. 12526
A.D. 1894.
The improvements refer more particularly to the construction and arrangement
of the block and block carrier and parts thereof, by which improvements the
stability and efficiency of the pneumatic brake is in some cases increased and the
wearing parts may be readily renewed.
The drawings attached hereunto illustrate the method of construction of the
improved brake apparatus. Figure 1 represents a vertical section of the brake block
and carrier, Figure 2 a back view and Figure 3 a plan of the same. Figures 4, 5,
and 6 represent similar views of a modification of the apparatus.
The block consists preferably of a dovetail channeled plate a into which a
shoe a¹ of indiarubber or other suitable substance is slid, the dovetail channel
either tapering or being provided with a lip a², either of which prevents the block
from being forced out when applied to ordinary road vehicles. The shoe a¹ may
be prevented from being forced out, in cases where the pressure is applied in the
other direction, by securing a plate a³ to the upper part of the block.
The opposite face of the block a is formed with a hemispherical or other suitably
shaped recess, preferably however an annular recess of the form indicated at a
Fig. 1.
Above the recessed part is formed a bearing a by which the block is suspended.
The block carrier has an arm b¹ having a bearing 2. From this bearing the
block a is hung by means of the link or links 63. The inside face of the carrier is
formed with a recess corresponding to the recess at of the block a. The outer
face of the carrier is provided with means by which it may be secured to the body
of the vehicle or other non-rotating part. A lug & having a hole through which
passes the end of an arm d secured by a nut is here shown as being a convenient
form of attachınent said arm being preferably fixed upon the wheel axle.
Into the cavity formed by the two recesses at and 64 a suitably formed flexible
extensible and contractible chamber c of indiarubber or other similar suitable sub-
stance is placed. Into this chamber a pipe c¹ is led through the carrier b. The
chamber is preferably fixed into each of the parts a' and 64 by means of dovetail
bosses c² which enter into correspondingly formed recesses in the two parts referred
to. But I may secure the chamber c by other suitable means for instance by
clamping each flat side to the block and carrier by passing a flat headed screw bolt
therethrough fitted with a nut,
In the modification represented in the views 4, 5 and 6 the link or links 63 are
dispensed with and the bearing as is extended up to the bearing 63 of the arm b¹.
The brake block is actuated by means of a pump or forcing apparatus which
may be worked by the hand or foot. A suitable fluid, air or water for instance, is
forced into the chamber c causing it to expand and force the shoe a¹ against the
rim of the wheel p. Upon releasing the pressure by means of a valve at the pump
or forcing apparatus the fluid is forced back out of the chamber c. In the case of
air being the fluid the weight of the block and shoe and the elasticity of the
chamber if made of indiarubber will effect this, but if water be the fluid used a
suitable spring could be attached in such a manner as to assist in returning the
shoe and block to its normal position.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is
1. The improved construction and arrangement of fluid pressure wheel brakes
substantially as herein before described and illustrated by the drawings.
2. In a fluid pressure wheel brake the arrangement of a block carrying a shoe
and suspended from a carrier fixed to the vehicle, and a flexible extensible and
contractible chamber between the block and carrier and attached thereto
substantially as herein before described and illustrated by the drawings.

page_text: 3. In a fluid pressure wheel brake the combination of a block suspended from a
carrier fixed to the vehicle, a brake shoe fixed to the front of the block, an
extensible and contractible flexible chamber fitting into recesses of the block and
carrier and attached thereto, and means for extending said chamber by fluid pressure
and releasing the pressure substantially as hereinbefore described and illustrated
by the drawings.
Dated this 20th day of June 1896.
R. J. URQUHART,
57, Barton Arcade, Manchester, and 5, Clayton Square, Liverpool,
Consulting Engineer and Patent Agent.