Improvements in or connected with Pneumatic Cycle Brakes.
Year: 1897

page_text: DI MUITIVATION.
Improvements in or connected with Pneumatic Cycle Brakes.
I, JOHN ERNEST LEATHERBARROW, of 33, Worthington Street, Old Trafford,
Manchester, in the County of Lancaster, Engineer, do hereby declare the nature
of this invention to be as follows:-
My said invention relates to improvements in or connected with pneumatic
cycle brakes and refers to an improved method of mounting, adjusting and
securing such brakes, when applied to the front fork of a bicycle, tricycle, or the
like.
According to my invention on the top of the usual brake shoe casting, having
a curvature about co-incident with the periphery of the cycle wheel, I form or
secure an upwardly extending hollow pillow, or tube preferably of a section other
than circular. Down this pillow or sleeve the air pressure tubing passes to the
pneumatic brake cushion shrouded by the brake shoe casting. To secure this
brake shoe to the cycle.I provide a special clip. This clip I propose to make from
a single strip of metal, the metal being first doubled upon itself and bent to form
an eye or gripping circle to engage the hollow pillow or extension carried by the
brake shoe. The two ends of the strip are now passed flat together to form
straight meeting surfaces and continue so for a short distance the meeting faces
being held together and jambed preferably between two flat making up pieces
or washers, by means of a small bolt and nut. The two extending ends of the
strip forming the clip are finally bent out to form two semi-circular clip halves
adapted to encircle and grip the steering post where it passes through the crown of
the steering fork.
In applying a pneumatic brake so constructed to a cycle the two semi-circular
halves, as before stated, are caused to grip the tube at the crown of the steering
fork the clip halves being drawn together or tightened on the tube by a screw
or other suitable device. Now should the brake shoe require adjustment, say to
bring the same nearer to the wheel tyre, all that requires to be done is simply to
slacken the nut binding together the two flat meeting faces when the hollow
extension or tube may be slid in its gripping circle or eye and consequently the
brake shoe advanced nearer to the tyre. On the required adjustment being effected
the nut may be at once tightened up when the flat meeting faces are immediately
pressed together and the gripping circle or eye caused to bind on and hold the
hollow pillow or tube whereby the brake shoe is firmly secured in its adjusted,
position.

page_text: WICH Deumatic Cycle Brakes.
I, JOHN ERNEST LEATHERBARROW, of 33, Worthington Street, Old Trafford,
Manchester, in the County of Lancaster, 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 :—
My said invention relates to improvements in or connected with pneumatic cycle
brakes such as are described and claimed in the Specification of Letters Patent
No. 16581, A.D. 1893 and refers to an improved method described in the
Specification of Letters Patent No. 15811, A.D. 1896 of mounting, adjusting and
securing such brakes, when applied to the front fork of a bicycle tricycle or the
like.
Now these improvements consist in the particular construction of the clip for
mounting and securing the brake shoe as hereinafter described.
In order that my invention may be more readily understood, I have attached
hereunto a sheet of drawings to which I will now refer. In the said drawings,
Figure 1 represents a side elevation and Figure 2 a plan of my improvement;
Figure 3 also represents a side elevation of my improvement in which the relative
disposition of the parts changed.
1
According to my invention on the top of the usual brake shoe casting a having a
curvature about co-incident with the periphery of the cycle wheel, I form or secure
an upwardly extending hollow pillar, or tube al preferably of a section other than
circular. Down this pillar or sleeve the air pressure tubing p passes to the
pneumatic brake cushion q, shrouded by the brake shoe casting . To secure this
brake shoe to the cycle I provide a special clip b; this clip I make from a single
strip of metal, the metal being first doubled upon itself and bent to form an eye or
gripping circle 61, to engage the hollow pillar or extension a¹ carried by the brake
shoe (t.
The two ends 623, of the strip are now passed flat together to form
straight meeting surfaces and continue so for a short distance, the meeting faces
being held together and jambed preferably between two flat making-up pieces or
washers 64, by means of a small bolt and nut b5. The two extending ends 62, 63, of
the strip forming the clip are finally bent out to form two semi-circular clip
halves 6, 67 adapted to encircle and grip the steering post o where it passes
through the crown of the steering fork.
In order to prevent the shoe a from moving upwards after having been set at
the required distance from the tyre of the wheel, I sometimes provide two eccentric
discs c c which are bolted to the clip and set to bear against the collar o' of the
steering fork and receive the thrust when pressure is applied between the tyre and
the shoe.
In Figures 1 and 2, the clip b is shewn with the parts 62 63 cranked or bent so
as to bring the shoe into a suitable position relatively to the tyre. In Figure 3 the
clip is shewn reversed and is applicable in this position in cases where the part o of
the steering post to which the clip b is fixed, is farther from the tyre of the wheel
'than in the case illustrated by Figures 1 and 2.
In applying a pneumatic brake so constructed to a cycle the two semi-circular
halves b, b7 as before stated, are caused to grip the tube o at the crown of the
steering fork the clip halves being drawn together or tightened on the tube by
screw 9, or other suitable device. Now should the brake shoe require
adjustment, say to bring the same nearer to the wheel tyre, all that requires
to be done is simply to slacken the nut binding together the two flat
faces when the hollow extension or tube may be slid in its gripping
eye and consequently the brake shoe advanced nearer to the tyre.
meeting
circle or
On the

page_text: required adjustment being effected, the eccentric discs c, c¹ are set so as to touch
the collar o and the nut is at once tightened up when the flat meeting faces
are immediately pressed together and the gripping circle or eye caused to bind
on and hold the hollow pillar or tube whereby the brake shoe is firmly secured
in its adjusted 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
The improved method of forming clips for attaching pneumatic brake shoes
formed with suitable pillars to the frames of velocipedes which consists in bending
a suitable sized strip of metal into a double clip so as to grip the pillar of the
brake shoe and a suitable part of the machine and tightly fixing the clip to
these parts by means of bolts between the two gripping parts and at the ends
of the clip, substantially as herein before described and illustrated in the several
views of the drawings attached.
1030.
R. J. URQUHART,
57, Barton Arcade, Manchester,
Harrington Chambers, 24, North John Street, Liverpool,
Consulting Engineer and Patent Agent.