Improvements in Back Wheel Rim Brakes for Cycles and similar Road Vehicles.
Year: 1899

page_text: KRUVIDIONAL DIMOLTIVATION
Improvements in Back Wheel Rim Brakes for Cycles and similar
Road Vehicles.
.
I, CHRISTOPHER HARCOURT SHACKLOCK, of The Ashes, Wolverhampton, in
the County of Stafford, Cycle Works Manager, do hereby declare the nature of
this invention to be as follows:-
The object of my invention is to produce a rim brake with a paralel action-i.e.
paralel to the back fork of machine, and also one that shall adjust itself to the
rim of the wheel whatever position that wheel may take through adjustment
(viz. taking up the slack of the chain from time to time), so long as chain
is in alignment.
To attain this object I construct a brake-shewn in the accompanying draw-
ings consisting of stirrup slides A & B, brake shoes C, spring slide hangers D,
lever E, adjustment screw F and spring G.
The stirrup slides A & B shaped to suit the back fork, or as shewn in the
accompanying drawings, are lengthened past the brake shoes C, the lengthened
portion forms the slide and finds a bearing in the spring slide hangers D, through
which they move backwards and forwards paralel to the back fork of machine.
The brake shoes C, which are fitted with brake blocks of leather, fibre, or
other suitable material, are pivotted at H, so that they may bed their whole
length to the rim of the wheel, thus gaining a maximum amount of friction.
The spring slide hangers D, are constructed to clip on the back fork of
machine, and in their lower portion are provided with a slot I, through which
To prevent any
the lengthened portion of the stirrup slides A & B move.
looseness or shaking a small spring K, is provided.
The lever E is attached to the bottom bracket of machine and is actuated by
a roller clutch or any other suitable and well known device, by means of which
it may run free in forward pedalling, and is only put in action when the pedal-
ling is reversed. The brake is taken out of action by means of a spring or
springs G, or other suitable device, which pulls the brake out of action imme-
diately forward pedalling is resumed.
The amount of brake power is regulated by the amount of pressure put upon
the pedals of machine and may be graduated from zero to any power that may
be necessary.
The brake is secured to the lever E, by means of the hinged adjustment
screw F, which allows of the brake being adjusted to suit the sometimes neces-
sary lengthening of back forks occasioned by the required clearance for large
chain wheels.
In the accompanying drawings:-
Fig. 1 is a side elevation of brake fitted to bottom bracket & back fork of
machine A & B is the stirrup slide, C the brake shoes, D the spring slide
13 the lovor F the adjustment screw, G the spring, H the pivot on

page_text: which the brake shoe hinges, I the slot in slide hanger. K the small spring
take up shake in the slide hanger.
Fig. 2 is a plan of the brake::
Fig 3. is a plan of small spring K.
Fig. 4 is an elevation of small spring K.
Fig. 5 is a side elevation of slide hanger.
Fig. 6 is a front elevation of slide hanger.
110.5700
Dated this 30th day of November, 1899.
COMPLETE SPECIFICATION..
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Improvements in Back Wheel Rim Brakes for Cycles and similar
Road Vehicles.
I, CHRISTOPHER HARCOURT SHACKLOCK, of The Ashes," Wolverhampton, in
the County of Stafford, Cycle Works Manager, do hereby declare the nature of
this invention and in what manner the same is to be performed, to be parti-
cularly described and ascertained in and by the following statement :-
The object of my invention is to produce a rim brake with a parallel action
to the back fork of machine and also one that shall -adjust itself to the rim of
the wheel whatever position that wheel may take through adjustment (viz.
through taking up the slack of the chain from time to time) so long as the
chain is in alignment.
To attain this object I construct a brake-shewn in the drawings left with
the Provisional Specification--consisting of stirrup slides A & B. Brake shoes C.
Spring slide hangers D. Lever E. Adjustment screw F, and spring G.
The stirrup slides A & B, shaped to suit the back fork of machine, or as
shewn in the drawings, are lengthened past the brake shoes C. The lengthened
portion forms the slide, and finds a bearing in the spring slide hangers D,
through which they move backwards and forwards paralel to the back forks
of machine.
The brake shoes C, which are fitted with friction blocks of leather fibre or
other suitable material, are pivotted at H, so that they may bed their whole
length to the rim of the wheel, thus gaining a maximum amount of friction.
The spring slide hangers are constructed to clip on the back fork of machine,
and in their lower portion are provided with a slot I, through which the length-
ened portion of the stirrup slides A & B move. To prevent any looseness or
shake a small spring K is provided.
The lever E is attached to the bottom bracket of machine, and is actuated by
a roller clutch or any other suitable & well known device, by means of which
it may run free in forward pedalling, and is only put into action when the
pedalling is reversed. The brake is taken out of action by means of a spring or
springs G, or other suitable device, which pull the brake out of action imme-
diately forward pedalling is resumed.
The amount of brake power available is regulated by the amount of pressure
put upon the pedals of machine and may be graduated from zero to any power
that may be necessary.
The brake is secured to the lever E, by means of the hinged adjustment
screw F which allows of the brake being adjusted to suit the sometimes neces-
sary lengthening of back forks occasioned by the required clearance for large
chain wheels.
In the drawings left with the Provisional Specification.

page_text: Fig. 1 is a side elevation of brake fitted to bracket and back fork of machine,
A & B is the stirrup slide, C is the brake shoes, D) the spring slide hangers,
E the lever, F the adjusting screw, G the spring H the pivot upon which the
brake shoes hinge, I the slot in slide hangers K the small spring to take up
play in the slide hangers.
1
Fig. 1 is a side elevation of brake fitted to bracket and back fork of machine,
A & B is the stirrup slide, C is the brake shoes, D the spring slide hangers,
E the lever, F the adjusting screw, G the spring H the pivot upon which the
brake shoes hinge, I the slot in slide hangers K the small spring to take up
play in the slide hangers.
plan of the brake.
Fig. 3 is a plan of small spring K.
Fig. 4 is an elevation of ditto.
Fig. 5 is a side elevation of slide hanger.
Fig. 6 is a front elevation of ditto.
Like letters denote like parts throughout.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:
1st. The construction of a back wheel rim brake, consisting of stirrup slides,
brake shoes, spring slide hangers, lever, adjusting screw, and springs, that shall
always work parallel to, and will not be affected by altering the position of the
driving wheel in the back forks of the machine, due to stretching of or taking
up the slack of the chain-and that may be put into action at any point of
rotation by back pedalling, substantially as hereinbefore described and illus-
trated..
2nd. The adoption of a hinged adjustment screw, as a means of adapting
the brake to machines in which the back forks are lengthened to give clearance
for large chain wheels, substantially as hereinbefore described & illustrated.
Dated this 20th day of February 1900.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:
1st. The construction of a back wheel rim brake, consisting of stirrup slides,
brake shoes, spring slide hangers, lever, adjusting screw, and springs, that shall
always work parallel to, and will not be affected by altering the position of the
driving wheel in the back forks of the machine, due to stretching of or taking
up the slack of the chain-and that may be put into action at any point of
rotation by back pedalling, substantially as herein before described and illus-
trated..
2nd. The adoption of a hinged adjustment screw, as a means of adapting
the brake to machines in which the back forks are lengthened to give clearance
for large chain wheels, substantially as herein before described & illustrated.
Dated this 20th day of February 1900.
C. H. SHACKLOCK.