Machine element or mechanism – Elements – Cranks and pedals
Patent
1996-03-07
2000-11-14
Battista, Mary Ann
Machine element or mechanism
Elements
Cranks and pedals
74 63, 464106, B62M 106
Patent
active
061454087
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns a mechanism with an ingoing and an outgoing shaft for transforming a rotation with constant angular velocity to a rotation with periodically varying angular velocity. In the prior art is known a mechanism of this sort with an ingoing shaft, a universal joint no. one with pivots, a ringshaped middle part, which is firmly combined with the pivot, a universal joint no. two with pivots and an outgoing shaft, the ringshaped middle part has only one pivot for the first and the second universal joint, and so there is not achieved a summation of the angular velocity amplitudes which can arise in the single joints, when they are adjusted to an angular deflection, by the ringshaped middlepart being tilted round a diameter, which is at right angles to the ingoing and the outgoing shaft, this mechanism achieves a periodically varying angular velocity by the pivots of the second universal joint having an angle between them, differing from 90.degree..
Another mechanism is known in the prior art having coaxial ingoing and outgoing shafts, two universal joints connected in series, wherein the output of one universal joint is an adjustable middle part which is the input of the other universal joint, wherein the one universal joint is connected with the ingoing shaft via a fixed component in form of an arch with pivots or bearings for pivots on its extremities as the ingoing shaft goes through the outgoing shaft which is hollow and carries the ingoing shaft whereby both the ingoing and the outgoing shaft go through the swingable adjustable middle part, which means that the swingable adjustment by the middle part is substantially limited because both the ingoing and the outgoing shaft go through said middle part.
Another mechanism for transforming a rotation with constant angular velocity to a rotation with varying angular velocity consists of chaindrive with an oval sprocket wheel. This mechanism is used for bicycles in order to pass quickly the pedal positions, which give a bad moment of the pedalcrank. It has the disadvantage that you can neither adjust the amplitude, nor the phase of the angular velocity.
SUMMARY OF THE INVENTION
By means comprising of middle part pivots for each of the two universal joints connected in series having their axes at right angles to one another, there is achieved a summation of the angular velocity amplitudes of the universal joints, in the outgoing shaft, as it is also known, when the middle part is a shaft with universal joints connected in series in each end, when the pivots in each end of the shaft are at right angles to one another.
The ingoing shaft is supplied with connecting means comprising of a pair of traversing radially directed pivots for engaging into a surrounding ring. It can go through if the other pivots of the universal joints are radially placed on rings that surround one another, so that the outgoing shaft is identical with the outermost ring.
The pivots can with advantage be at right angles to one another, as is normal in universal joints.
The ringshaped middle part (4), which can be swung (tilted) round an axis, at right angles to the ingoing shaft, can, with advantage, also be suspended turnably around the very axis of the ingoing shaft, the amplitude phase then being adjustable.
The ringshaped middle part is, as mentioned, connected to a non-rotating, but swingable part, whose tilting decides the amplitude. This swingable part is provided with actuating means which may include a segment of a sphere with a groove, that gives space for the ingoing shaft, during the swinging, (adjustment).
The swinging may be controlled via radially directed pivots in connection with the sphere-segment.
The pivots can engage in a roller-path in a rotatable ball-sector, whose rotation to a location-position decides the swing. The swing movement, which controls the amplitude, can take place around bearings, whose axes are situated on the diameter of an outer ring, concentric with the ingoing shaft.
By rotation of this outer ring, the
REFERENCES:
patent: 668873 (1901-02-01), Dickinson
patent: 1035654 (1912-08-01), Swanson
patent: 1783758 (1930-12-01), Weiss
patent: 2020123 (1935-11-01), Pollard
patent: 3030784 (1962-04-01), Minik
patent: 3456458 (1969-07-01), Dixon
patent: 3475976 (1969-11-01), Steinke
patent: 4697469 (1987-10-01), Takamiya et al.
patent: 4712450 (1987-12-01), Takamiya et al.
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