Year: 1897

page_text: Date of Application (in the United Kingdom), 9th Sept., 1897
I, LAVERUX NELSON DYRBERG, of Ashburton, Canterbury, in the Colony of
New Zealand, brickmaker, do hereby declare the nature of my invention :- and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
This invention relates to improved brake-gearing for qycles; the object being to
apply an effective brake power by means of friction clutch gearing operated by
the feet.
In my invention a friction clutch is fitted in a clutch box on the driving chain
wheel, to the face of which clutch the brake is connected by means of a suitable
rod.
The rear chain wheel forms another clutch box in which a similar clutch is
fitted (to work in an opposite direction to that on driving wheel) so that when the
cranks are turned in a forward direction the driving chain wheel with its clutch
box, rotates free of the clutch, whilst the clutch box on rear chain wheel, by the
action of the chain, engages the clutch within it and propels the machine; but
when a backward pressure is exerted upon the cranks by the feet, the clutch box
on driving chain wheel engages the clutch within it, thus stopping the motion of
the chain and both chain wheels and at the same time actuating the brake, while
the rear wheel of machine is free to rotate until stopped by the brake.
When the brake is not required to be used, the clutch on rear wheel may be
locked by means of a suitable device hereafter described.
If desired, instead of a clutch being fitted within the driving chain wheel for
operating the brake, a clutch box may be fitted on crank at opposite side of bracket
having a clutch block within it to which the brake rod is connected; and in lieu
of the clutch block in rear chain wheel, a clutch block may be fixed on crank
spindle and within the driving wheel as hereafter explained.
In the accompanying drawings illustrating my invention
Figure 1 is a side view of a portion of a bicycle showing the sprocket chain
wheels with clutch boxes and brake.
Figure 2 is an enlarged sectional view of the clutch box and clutch on rear
wheel (the face plate being removed).
Figure 3 is an enlarged sectional view of the clutch box and clutch in driving
chain wheel (the face plate also being removed).

page_text: Figure 4 is an enlarged longitudinal section through the bracket and driving
chain wheel showing clutch box and clutch and hanging crank to which the brake
connecting rod is attached.
Figure 5 is an enlarged longitudinal section through the "bracket" and driving
chain wheel showing another mode of attaching the chain wheel and clutch.
Figure 6 is a side elevation of same, showing brake connecting rod.
Figure 7 is an enlarged longitudinal section of bracket with driving wheel and
clutch box and clutch, and also the clutch box fitted on crank with clutch block
within it, to which the brake rod is connected.
Figure 8 is an enlarged sectional side view of driving wheel and clutch fixed on
crank spindle.
Figure 9 is an enlarged sectional side view of the clutch box fitted on crank
with clutch block working on bracket.
Figure 10 is a plan showing the mode of connecting brake to the rear forks of
machine, and also the means of attaching brake to connecting rod.
Figure 11 is an enlarged side view of rear chain wheel, showing locking device.
Figure 12 is a top view of same.
The same letters of reference denote like parts where they occur in the several
figures.
Referring to Figures 1, 2, 3, and 4. A is the clutch box formed on or attached
to the driving chain wheel B in which clutch box the clutch block C and rollers (a)
are fitted, the face plate (6),.which is fixed to said block, fitting against the end of
bracket (c) and having hanging crank (d) to which the brake 1) is connected by
means of the rod (e), the arms (f) of the said brake being pivotally connected to
the rear forks E of the machine as hereinafter described.
The brake D is provided with pads of suitable material, which, when the power
is exerted, clip the inner side of the rim of rear wheel of machine.
The rear chain wheel F is constructed to form another clutch box in which the
clutch block G and rollers (9) are fitted, the said chain wheel being fitted loosely on
the hub (h) but the clutch block is screwed thereon.
It will be readily seen that when the machine is driven forward the driving
chain wheel B will rotate free of the clutch block C and rollers (a) while the rear
chain wheel F clutch block G and rollers (9) therein rotate with the wheel of
machine, but when a backward pressure is imparted to the cranks the clutch
block C causes the rollers (a) to engage the clutch box A and simultaneously by
means of the chain, the rollers (g) are caused to engage the clutch box of rear chain
wheel F, thereby stopping the motion of both chain wheels and chain, and at same
time drawing the brake D against the rim of the rear wheel which is enabled to
rotate free of the chain wheel F and clutch, until stopped by the brake.
Referring to Figures 5 and 6 which illustrate another mode of attaching the
driving chain wheel B' with clutch box A' and clutch block C¹ with rollers therein,
it will be seen that the "bracket" (c) is lengthened and provided with a flange (2)
forming the face plate of the clutch block (c) this flange being provided with an
are shaped slot (1) through which a pin (k), secured into clutch block (c), passes,
and to which pin the brake connecting rod (e) is secured, another flange (21)
being secured to end of bracket to retain said clutch block in position.
A suitable spring may be attached to clutch box face and connecting rod for
releasing the brake after the pressure is taken off.
In this arrangement, when the backward pressure is imparted to the cranks,
the clutch is caused to turn back when the pin (k) moves in the slot () and
draws up the brake upon the rim of rear wheel of machine.
Referring to Figures 7, 8, and 9, which illustrate another arrangement of the
gearing, a clutch box A2 is fitted to crank on opposite side of "bracket," in which
box a clutch block C² and rollers are fitted, to which clutch block the brake rod is
connected, while a clutch block G¹ and rollers are fitted within a clutch box on the
driving wheel, and fixed on the crank spindle.
This clutch takes the place of the clutch (before described) within the rear chain
wheel F.

page_text: By this arrangement (which would not necessarily be confined to machines having
chain and sprocket driving gear), when the brake is operated (in the same manner
as before described) the chain and chain wheels can rotate independent of the
cranks.
Referring to Figure 10, which more fully illustrates the brake D and mode of
connecting it to rod (e) and also to the rear forks E, it will be seen that the brake
is formed of two parts, and that the arms (f) are pivotally connected to the lugs (f)
formed on said rear forks, by means of screws (2) which are passed loosely through
said lugs and screwed into the arms (f); a shoulder being formed or each screw
so as to be flush with the inside of the lug to prevent jamming.
The two parts of brake are brought together outside the wheel and secured by
a bolt and nut () with a thickness piece or washer (m) between the said two parts;
the end of rod (e) being placed between the said parts and pivotally connected by
means of the bolt and nut (n).
-
Referring to Figures 11 and 12 illustrating the locking device on clutch on rear
chain wheel; two lugs (o) are formed on the face of the clutch, the inner edges
being bevelled; a dove-tailed bolt (p) is passed between these lugs and is pro-
vided with a tapped pin (g) with nut (r); a slotted lug (s) being formed on the
clutch box; to lock the clutch the end of this bolt is pushed into the slotted lug
and the nut tightened up, but when the holt is drawn back to clear the slotted lug
the clutch is free to work as before described.
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 herein described friction clutch brake-gearing for cycles substantially
as set forth and illustrated in the accompanying drawings.
(2) In brake-gearing for cycles a clutch box such as A formed on or attached to
the driving chain wheel B in which clutch box a clutch block C and rollers (a) are
contained, to the face plate (b) of which block is connected, by means of a rod such
as (e) a brake such as D; in combination with a chain wheel forming a clutch box
such as F on hub of rear wheel in which clutch box a clutch block G and rollers (g)
are contained and provided with locking device, substantially as and for the pur-
pose herein described and illustrated in the accompanying drawings.
(3) In brake-gearing for cycles a clutch box such as A¹ formed on or attached
to the driving chain wheel B' in which clutch box a clutch block C¹ and rollers aro
contained, such chain wheel and clutch block being fitted upon the "bracket" C¹
provided with flanges (i) and (i) forming the face plate of said block and provided
with are shaped slot () through which a pin (k) secured to said block passes and to
which pin the brake nod (e) is connected; in combination with a chain wheel form-
ing a clutch box such as F on hub of rear wheel in which clutch box a clutch
block C and rollers (g) are contained and provided with locking device substan-
tially as and for the purposes herein described and illustrated in the accompanying
drawings.
(4) In brake-gearing for cycles a clutch box A2 fitted upon crank and having a
clutch block C2 and rollers within it, to which clutch block the brake rod is con-
nected, in combination with a clutch block G¹ fixed upon crank spindle and working
with rollers within a clutch box on driving wheel substantially as described and
illustrated in the accompanying drawings.
Dated this 8th day of September 1897
A. M. & WM. CLARK
Chartered Patent Agents 53 Chancery Lane London