Coupling for a bicycle

Details Coupling for a bicycle Coupling for a bicycle

1989-11-29

1991-04-02

Bonck, Rodney H.

192 clutches and power-stop control

Vortex-flow drive and clutch

With brake

192 46, 192 6A, 192 4892, F16D 4124, F16D 6700

Patent

active

050040839

DESCRIPTION:

BRIEF SUMMARY
This invention relates to a coupling means for a bicycle provided with a pedal operated brake activating means separated from the drive chain, and which comprises a first freewheel coupling associated with pedal crank for torque transmission to the brake activating means at reverse rotation of the pedal crank and a second freewheel coupling associated with the drive wheel of the bicycle for torque transmission to the drive wheel at forward rotation of the pedal crank.
One problem inherent with previously known bicycle designs of this type resides in the fact that the freewheel coupling in the pedal crank assembly and the drive wheel hub have had such an engagement direction that by rearward movement of the bicycle, i.e. when the drive wheel is rotated in its reverse direction, such a rearward movement is transferred by the chain to the pedal crank and further to the brake activating means, whereby the brake is activated and the bicycle is locked dead.
This invention intends to accomplish a device which automatically will inactivate the braking function at reverse rotation of the drive wheel.
Embodiments of the invention are herein below described in detail under reference to the accompanying drawings.
On the drawings:
FIG. 1 shows a side elevation of the bicycle comprising the pedal crank assembly, the drive wheel and the brake device.
FIG. 2 shows cross-section along line II--II in FIG. 1 including a disengagement means according to the invention.
FIG. 3 shows, partly in section, a view of the pedal crank assembly of the bicycle.
FIG. 4 shows a section along line IV--IV in FIG. 3 and illustrates the brake activating means as well as the disengagement means.
FIG. 5 shows a disengagement device according to the invention located in the hub of the drive wheel.
FIG. 6 shows a section along line VI--VI in FIG. 5.
FIG. 7 shows a section along line VII--VII in FIG. 5.
FIG. 8 shows a longitudinal section through the hub of the drive wheel according to an alternative embodiment of the invention.
FIG. 9 shows a section along line IX--IX in FIG. 8.
FIG. 10 shows a section along line X--X in FIG. 8.
FIG. 11 shows a longitudinal section through the drive wheel hub according to another embodiment of the invention.
FIG. 12 shows a section along line XII--XII in FIG. 11.
FIG. 13 shows a side elevation of the bicycle comprising assembly, the drive wheel and brake device
FIG. 14 shows cross-section along line XIV--XIV in FIG. 13 including a disengagement means according to invention.
FIG. 15 shows, partly in section, a view of the pedal crank assembly of the bicycle according to another embodiment of the invention.
FIG. 16 shows a section along line XVI--XVI in FIG. 14
FIG. 17 shows a section along line XVII--XVII in FIG. 15
FIG. 18 shows a section along line XVII--XVII in FIG. 15 according to another embodiment of the invention.
The bicycle which is illustrated in FIG. 1 comprises a pedal crank assembly in which is journalled a pedal crank shaft 2 provided with rigidly attached pedal arms and a sprocket wheel by which a chain is connected to the drive wheel of the bicycle. The pedal crank assembly also comprises a brake activating means which by means of a wire 50 is connected to a rim brake 51.
The brake activating means at the pedal crank assembly comprises a sleeve 1 which is rigidly attached to the crank shaft 2, a rotating ring 3 surrounding the sleeve 1 and being drivingly connected to the latter via friction surface 10. See FIG. 3. These friction surfaces 10 are concial and are pressed together by means of a washer spring 9 which acts against one of the pedal arms 5. The rotating ring 3 is provided with ratchet teeth 4 for cooperation with a number of catches 7. The latter are pivotally supported on a ring 6 which in turn is formed with a radially extending activating arm 8. See FIG. 4.
At forward rotation of the pedal shaft, the catches 7 remain unengaged in that they are pivoted away from the teeth 4 of the rotating ring 3. At reverse rotation of the pedal cranks, the cathes 7 will engage positively the teeth 4 a

REFERENCES:
patent: 2094687 (1937-10-01), Thompson
patent: 4134481 (1979-11-01), Calderazzo
patent: 4187728 (1980-02-01), Mazzorana
patent: 4702486 (1987-10-01), Tsuchie
patent: 4727965 (1988-03-01), Zach et al.
patent: 4766772 (1988-04-01), Tsuchie

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