Improvements in and relating to Rim Brakes for Cycles.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in and relating to Rim Brakes for Cycles.
I, JAMES RICHARD TRIGWELL, of 146, Brixton Hill, in the County of Surrey,
Cycle Manufacturer, do hereby declare the nature of this invention to be as
follows:-
This invention relates to rim brakes for cycles of the kind in which the
brakes are applied by levers pivotted to or on the cycle frame and operated
by a brake rod.
The object of this invention is so to mount the brake shoes of such brakes that
when brought into operation they will adjust themselves to the inner periphery
of the wheel rim and will at the same time allow for any inequalities in the
truth of the rim.
According to this invention I pivot the brake shoe at about its centre to the
free end of the brake lever so that it may freely turn on said pivot and adjust
itself to the proper angle required by the inner part of the wheel rim. The
pivot connecting the brake shoe and lever is mounted in a slotted bearing having
a spring thereunder or the brake shoe is otherwise so mounted as to have a
spring controlled movement in a plane radial to the wheel rim.
In some cases I fit the brake levers to the front fork by means of clips the
screw bolts of which form centres for the levers said bolts being elongated ex-
teriorly so as to form foot rests.
2011
1
1900
F. W. GOLBY,
36, Chancery Lane, London, W.C.,
Patent Agent for the Applicant.
I, JAMES RICHARD TRIGWELL, of 146, Brixton Hill, in the County of Surrey,
Cycle Manufacturer, do hereby declare the nature of this invention and in what
manner the same is to be performed to be as follows:-
This invention relates to rim brakes for cycles of the kind in which the
brakes are applied by levers pivotted to or on the cycle frame and operated
by a brake rod.
The object of this invention is so to mount the brake shoes of such brakes that
when brought into operation they will adjust themselves to the inner periphery
of the wheel rim and will at the same time allow for any inequalities in the
truth of the rim.

page_text: According to this invention I pivot the brake shoe at about its centre to the
free end of the brake lever so that it may freely turn on said pivot and adjust
itself to the proper angle required by the inner part of the wheel rim. The
pivot connecting the brake shoe and lever is mounted in a slotted bearing having
a spring thereunder or the brake shoe is otherwise so mounted as to have a
spring controlled movement in a plane parallel to the plane of the wheel rim.
In some cases I fit the brake levers to the front fork by means of clips the
screw bolts of which form centres for the levers, but preferably the levers are
centred on the body of the clip.
In the accompanying drawings, Fig. 1 shows part of a cycle with my improved.
brake fitted thereto; Fig. 2 is an enlarged detached side elevation of the brake
rod and brake; Fig. 3 is a plan of Fig. 2; Fig. 4 is a side elevation showing a
modification of the means for attaching the brake rod and brake to the cycle
frame; Fig. 5 is a detached elevation further enlarged of the brake shoe, and
Fig. 6 is a section on the line 6-6 of Fig. 5; Figs. 7 to 9 show further modifica-
tions which will be explained hereinafter. The same letters of reference where
they occur are used to denote the same or corresponding parts in all the figures.
.Referring to Fig. 1 to 3. The brake rod A is pivotted to the lever A' in the
ordinary way and at the lower end is secured to or formed with a cross piece A²
to which the ends of a saddle piece B are pivotted, said saddle piece 13 being
pivotted at bb to diametrically opposite parts of the circular strap C (see Fig. 3).
This strap C is firmly bolted to the lower part of the steering tube D above.
the front fork D¹ and just below the steering pillar E. The saddle piece B is
preferably made in two parts, as shown, rigidly. secured together at the rear by a
bolt 2 which serves as a pivot to a stirrup-shaped lever F the ends of which carry
bearing plates g, having bearing holes g and 2 in either of which the brake shoe
may be pivotted, preferably by pivot bolts, as desired. ³ are stops on the side of
the brake shoe G which abut against the bearing plate g as the brake shoe turns
on its pivot to one side or the other, and limit its motion.
As shown in Figures 5 and 6 the brake block H (in Figures 1 to 3) is mounted
on a metal plate and the brake shoe G is made box-form with spiral or other
springs or rubber therein interposed between the underside of the plate h
and the interior of the box-shaped shoe G, the brake block being secured in the
shoe by suitable bolts or screw-studs h².
In the modification shown in Fig. 7 the pivot h³ of the brake block is mounted
in a slotted bearing in the brake shoe said bearing g being fitted with an
under bearing block g held up in position by a spiral or other spring or rubber g6.
In Fig. 8 I have shown the saddle piece B centred on the screw bolt B' closing
the ends of the clip or circular strap C, the bolt B₁ being elongated as shown
for that purpose and provided with nuts n n to bear on and close the clip
flanges c. The form first described with reference to Fig. 3 however, where
the saddle piece B is centred on the body of the clip C, is preferable as thereby
the length of the saddle piece B is reduced.
Fig. 9 shows a strap or clip C on the central part of the front fork which
clip carries a tubular box C₁ through which passes a short rod F', surrounded by
a spiral spring and rigidly connected to the upper central part of the stirrup F.
One end of a wire or the like is attached to the rod F¹ and connected at its
other end to the lever A¹ which in this case is pivotted on the other side of
the steering head and acts as a lever of the second order as will be well under-
stood by bicycle engineers.
Fig. 4 shows a fitting in the form of a short tube or rod K to which the brake
lever connection B is pivotted, said tube or rod K being adapted to be fitted
upwards into the interior of the steering tube D and brazed or otherwise rigidly
secured thereto. This form of my invention is adapted for application to cycles
where there is not sufficient space between the lower end of the steering pillar E
and the front fork D¹ for bolting a strap thereto as in the form described with
reference to Figs. 1 to 3.

page_text: 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:
1
1. A cycle rim brake comprising brake lever connections centred on a clip or
strap bolted to the steering tube or front fork, a stirrup pivotted to said lever
connections, brake shoes pivottally mounted on the ends of said stirrup, (and brake
blocks supported on springs or rubber in said brake shoes substantially as and
for the purpose hereinbefore set forth and illustrated in the accompanying
drawings.
2. A cycle rim brake comprising brake lever connections centred on a tube
or rod rigidly secured to the steering tube or front fork, a stirrup pivotted to
said lever connections, brake shoes pivotally mounted on the ends of said stirrup,
and brake blocks supported on springs or rubber in said brake shoes substantially
as and for the purpose herein before described with reference to Figs. 4 to 7 of
the accompanying drawings.
3. A cycle rim brake in which the brake lever connections are centred on a
clip or strap secured to the steering tube or front fork, and the brake blocks are
mounted on shoes pivotally mounted on the brake carrying lever substantially as
and for the purpose hereinbefore described and illustrated in the accompanying
drawings.
Dated this 30th day of September 1899.
F. W. GOLBY,
Patent Agent. 36, Chancery Lane, London, W.C.,
Agent for the Applicant.