Improvements in Driving Gear for Cycles and the like.
Year: 1897

page_text: Date of Application, 20th May, 1897-Accepted, 7th Aug., 1897
COMPLETE SPECIFICATION.
Improvements in Driving Gear for Cycles and the like.
I, RUDOLF WULFING residing at Berlin, 23 Beyreutherstrasse Kingdom of
Prussia Empire of Germany Private man 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:-
The present invention relates to a noiseless and adjustable gearing for cycles
or small motors to be worked by treading. On the shaft a of the driven motor
or cycle a ratchet wheel S is firmly wedged on. Round this ratchet wheel S a
casing D is arranged which is formed as a cord--or channel-pulley (Figs. 1, 2, 61
and which (D) moves loosely on the axle (shaft) a. This casing (1) has a click A
engaging in the toothed wheel. This click A is provided with a fork or cullis C
into which (C) catches the pin of a sliding piece G. The latter (G) slides on the
circumference of the ratchet wheel S, or on a cylindrical part arranged on the
same, and is formed exactly in accordance with the circumference, on which this
piece G is always firmly pressed by a spring e. When the casing D is moved in
the direction indicated by the arrow, the sliding piece G remains back on the
still stationary ratchet wheel S through the friction of both, and also keeps back
the cullis C of the click A, whereby the click A is pressed on the teeth of the
ratchet wheel S and caused to engage (Fig. 1.) When the draught in B, viz the
turning of the casing, ceases, and the ratchet wheel S continues its rotation in
consequence of the impulse given to it, it carries along the sliding piece G through
the friction of the same on the circumference. The piece G shifts with its pin
the cullis C and thereby lifts off the click from the teeth, entirely avoiding the
rattling noise hitherto produced with the existing click-and ratchet-wheels.
The casing D is further provided with an arrangement which may be formed in
any way in known systems and which has the purpose to always draw mechanism
(A G C e) back again into its initial position Fig. 1.
To give an example this mechanism is schematically represented in Figs. 1 and 2
by the weight b 1 with a cord b at a cord pulley 62. The above described arrange-
ment on the axle (shaft) a of the engine to be driven is worked by a cord or
ribbon B (Figs. 1, 2) winding up on a cord or ribbon-pulley r.
This pulley r
is fixed at an excentric E (Figs. 1 to 5) which is moved by the tread lever h,
The engagement of the lever h, which is loosely on the eccentric point, into
the eccentric E is effected by an elastic (f) click 9 provided below
with a
double-wedge-shaped piece 91; the click g places itself into
the notches 12 of the eccentric E. The eccentric E, with its loose
lever, is also always drawn back into the position of Fig. 1 by the retractive
arrangement (in the accompanying drawing for instance by the cord 6 and the
weights 61. Fig. 2 is the terminal position of the worked lever and the eccentric
disc. In order to alter the leverage between the lever h, which remains unalterable,
and the drawing disc r, a disc with nose n 1 is arranged, firmly connected with
the discs E and r; besides this a shiftable rods (Figs. 1-5 and 7) is provided with
pins s 1 and 2. In the terminal position of h (Fig. 2) the nose n 1 stands before the
pins 2 of the rod s. When the rod is pushed downward (Fig. 3) the pin s 2 catches
the nose and thereby turns the disc n, together with the eccentric E with the
D
3
01

page_text: ribbon pulley r so far round, in the direction of the arrow, until the click and
ratchet wheel g of the stationary lever h, which has slipped out of the notch 1,
snaps into the other notch 2 of the eccentric disc. The rod s is pushed still a
little farther in order that the pin, I may come out of the circle. Thus the
eccentric disc E, together with the iibbon pulley gets into another position to
the tread lever h, and the theoretical leverage between r and lever his altered
by the changed position of the eccèntric. The click tooth g with its double wedge-
shaped part (according to Figs. 3, 4, 5) is moved nearer to centre of revolution.
In order to effect the return of the disc, the lever is placed into its initial
position and the rod s is also pushed into its initial position (Fig. 5); the pin s 1
is thereby placed into the position indicated by dotted lines. When the lever h
is pressed down the double wedge-shaped piece y 1 pushes against the pins slides
along the same and thus draws the click tooth y out of the notch 1 of the eccentric
dise E. By the draught in the ribbon B the disc r and the eccentric disc E are
withdrawn, and the click tooth snaps into the notch 12; this again moves:..g
farther away from the centre of revolution and passes the pin s 1.
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:-
on
1. In a gearing for cycles or the like a noiseless click and ratchet wheel with
automatic engagement and disengagement of the click by a piece (G) sliding
the circumference of the ratchet wheel or of a cylinder connected with it, and with
automatic, return motion of the click bearing into its initial position, in connection
with an eccentric disc worked by the tread lever as a gear for the apparatus;
substantially as described.
2. In the above mentioned apparatus the arrangement of a disc (n) provided
with a nose n 1 at the eccentric disc (E) which is carried along by the lever (7)
by means of a switch (f), so that by pushing forward a rod (s) provided with
pins (12) a shifting of the eccentric disc (E) takes place or a disengagement of
the switch by a doubly conical sliding piece on a pin (s1) of the rod (s), sub-
stantially as described.
Dated this 17th day of May 1807