Improvements in the Construction of Rim Brakes for Cycles.
Year: 1899

page_text: Date of Application, 25th Sept., 1899
Curoloto Snorifination Inft 20th Man 1000
1
AAL
2004
PROVISIONAL SPECIFICATION.
Improvements in the Construction of Rim Brakes for Cycles.
ARTHUR WILLIAM DE VAL, of 6, Upper Tulse Hill, Brixton, S.W., in the
County of Surrey, Cycle Engineer, do hereby declare the nature of this invention
to be as follows:-
This brake is constructed with two seperate grippers which are regulated by.
the expansion of the top jaw of the brake compressing the grippers on the rim
by the action of a cam which acting direct on the top jaw effectually locks the
gripper on the rim automatically. The friction blocks or pads are jointed so
as to take a true bearing on the rim, the leaver connecting with the cam of the
brake can be worked from different positions on the machine by hand or foot
power. The brake is applicable to either wheel.
Dated this 25th day of September 1899.
.
ACTION OF Rim brakes for cycles.
I, ARTHUR WILLIAM DE VAL, of 6, Upper Tulse Hill, Brixton, London, Cycle
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:-
This invention relates to an improved construction of brake to act upon the
rim or felloe of a cycle or wheel.
The brake is constructed with two separate grippers forming jaws, which are
regulated and controlled by the expansion of the top jaw of the brake, causing
the compressing of the grippers upon the rim or tyre, such action being effected
by a cam which acts directly on the top of the jaws and effectually locks the
grippers of the brake upon the rim automatically.
The friction blocks or pad holders are jointed so as to take a true bearing on
the rim relatively to the gripping arms which carry them.
.
The lever connecting with the cam of the brake can be worked from different
positions on the machine by means of hand or foot-lever and the brake may be
applied to either the back or front wheel or wheels of the machine or vehicle.
In order that the invention may be well understood there is annexed hereto a
sheet of drawings wherein the construction and arrangement of parts are shown
and the same will be referred to in the following more particular description by
figures and letters like parts being denoted by similar figures and letters.
Fig. 1. is a front view of the brake attachment, the brake out of action.
D01

page_text: Fig. 2 is a back view of Fig. 1.
Fig. 3 is a similar view to Fig. 1, but with the cam in action, with the brake
jams brought towards each other, as in action.
Fig. 4 is a side view of the brake device following the Figs. 1, 2, 3 but with
cam lever raised according to Fig. 3.
Fig. 5, is a similar view to Fig. 4, but with two cams formed by a fork on
the cam lever.
Fig. 6, shows the brake shoes fitted with roller blocks if such be preferred.
Each gripper jaw A, has an upward extending arm A, and a centre plate A2,
through which the joint pin or bolt A³ passes.
One of the top jaws A', carries the cam a, the lever arm a¹, whereof, will be
connected by rod link or chain to the actuating brake lever handle operated
from the steering bar, the seat or otherwise as may be convenient.
The other of the top jaws A', carries a roller b, as in Figs. 1 to 4 or rollers b, b¹,
as in Fig. 5 but in this latter case the cam lever arm a, al is forked to provide
two cams a to correspond with the two rollers b, bl.
c, is a spring which will keep the gripper jaws in upright position and assist
in the adaptation of the brake shoes to the rim of the wheel when the leverage
is applied.
The brake shoe carriers d, are jointed at , to the extremities of the gripper
jaws A.
The bracket and screw and nut e, el, are for the purpose of attachment to a
bridge piece which will be bolted on and extend between the forks of the vehicle
framing. The jaws themselves will be against the said framing affording
rigidity
Obviously the brake may be applied to act on the tyre as well as on the rim
but such is not recommended.
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
The improved rim brake device constructed combined and operating as and
for the purpose herein set forth and shown by the drawings.
1000
Dated 20th March 1900.
For the Applicant,
WALTER A. BARLOW.
306, High Holborn, London, W.C.,
Consulting Engineer & Patent Expert.