192 clutches and power-stop control – Vortex-flow drive and clutch – With brake
Patent
1985-07-08
1988-03-01
Bonck, Rodney H.
192 clutches and power-stop control
Vortex-flow drive and clutch
With brake
74750B, 74781B, 192 46, B62M 1116, B62L 504, A61G 502, F16D 4130
Patent
active
047279656
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The invention refers to a geared hub with a freewheel, especially for wheelchairs, containing: a hub axle and a driver supported on the hub axle, a hub sleeve supported at one side on the driver and at the other side on a rotatable lever-cone, where the lever-cone may be fastened to the frame of the vehicle by means of a brake lever, an epicyclic gear accommodated within the hub sleeve, a coupling sleeve connecting the driver to the ring gear or to the pinion cage of the epicyclic gear, a thread on the pinion cage, onto which a brake cone may be screwed axially and upon turning the driver backwards spreads a brake member against the hub sleeve, at least one first ratchet gear having spring-loaded pawls for the transmission of the driving torque introduced by the driver via the members of the epicyclic gear into the hub sleeve in the forwards direction of rotation.
From West German O/S No. 24 39 332, West German O/S No. 25 56 029, the West German Patent No. 21 59 770 and West German O/S No. 25 14 418 geared hubs of that kind are known. These known hubs are bicycle hubs and have a freewheel which enables the hub sleeve to be turned forwards freely relatively to the driver. Furthermore, these known hubs also have a back-pedal brake by means of which via a brake cone and a braking member braking forces are exerted from the inside upon the hub sleeve, when the driver gets turned back by a predetermined amount relatively to the hub axle fastened to the vehicle frame, until the brake is applied. The epicyclic gear serves in the case of the known geared hubs for realizing different gear ratios between the driver and the hub sleeve. Through axial shifting of the coupling sleeve which acts between the driver and the members of the epicyclic gear or respectively through axial shifting of the members of the epicyclic gear the different gear ratios may, in a known manner, be selectively produced.
This known hub is unsuitable for incorporation into wheelchairs since, corresponding with its application to bicycles, it does not allow driving the hub sleeve in the backwards direction. Furthermore, these known hubs all have unblocking mechanisms which ensure release of the brake under all circumstances. In order to make this possible, these unblocking mechanisms produce a relatively large rotary play of from 20.degree. to 40.degree. in the forwards direction between the driver and the hub sleeve. This rotary play ensures that, with the backpedal brake fully braked, the brake cone is first withdrawn and the braking member thereby released, and that only after that does the ratchet gear acting between the driver and the hub sleeve take the hub sleeve with it again solidly in the forwards direction. Due to the construction this rotary play between the driver and the hub sleeve also exists in the case of the known hubs when the driver is to drive the previously freewheeling hub sleeve once again in the forwards direction via the corresponding ratchet gear.
Since the known hubs do not allow any driving in the backwards direction and since furthermore a rotary play of about 20.degree. to 40.degree. must always be overcome, if the driver wants to exert upon the previously freewheeling hub sleeve a driving torque, this known hub cannot be used in wheelchairs.
From West German O/S No. 26 29 839 a special wheelchair hub is further known which has a freewheel mechanism. From West German O/S No. 32 41 614 a wheelchair is likewise known which can be actuated by means of a hand lever and has a freewheel coupling. The hubs of these known wheelchairs do not have any change-speed gearing and furthermore have no active brake which can be actuated by the driver.
From West German O/S No. 29 29 138 a wheelchair is again known, which has a hub with a gear which, by selection, enables reversal of the direction of rotation and furthermore exhibits gear ratios which may be selected. This known hub likewise has no backpedal brake which can be activated by the driver.
By comparison, the problem of the invention is to develop a geared hub
REFERENCES:
patent: 3134274 (1964-05-01), Schwerdhofer
patent: 3438283 (1969-04-01), Schwerdhofer
patent: 3563568 (1971-02-01), Sasse et al.
patent: 3809195 (1974-05-01), Schulz et al.
patent: 4147243 (1979-04-01), Segawa et al.
patent: 4570769 (1986-02-01), Isaka
Giesau Alfred
Zach Wolfgang
Bonck Rodney H.
Sanitatshaus Heinrich Oesterreich GmbH
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