FR2665937A1 - Device intended to use a variable-speed circular movement in order to entrain a constant-speed circular movement - Google Patents

Abstract

This device is a lever arm rotating with a variable arm length (1) which, for an equal thrust, gives a variable speed to the spindle A and a variable thrust to the spindle B. Characterised by two arms (1) perpendicular to the spindle A entraining three pads (studs) (2) placed at an equal distance on a perpendicular circumference about the spindle B which is off-set with respect to the spindle A. This principle can be used with all spindles which receive an irregular thrust which it is sufficient to place at the best locations of the turn of the spindle A. Examples of application: bike pedals, engine pistons, cranks, etc.

Description

 Device intended to use a circular movement at variable speed, produced by means already known, pistons of internal combustion or steam engines, bicycle pedals, cranks, etc. . . , to cause a circular motion at constant speed.

 This device is a rotary lever with variable arm length which gives an irregular speed to the A axis for an irregular force transmission to the B axis.

 This device mounted on a bicycle gives very good results because the pedals are much less hard to press at the time of the effort than with a classic pedal at constant speed.

 Pedaling at irregular speed does not present any difficulty in adapting because the pedals remain integral with each other. To install this device on a bicycle, it is necessary to replace the B axis with a fairly large raceway. so that the axis A which is in this case that of the pedals passes inside.

This device is offset to the front where there is enough space. On the prototype I made, I installed a bottom bracket 1/3 larger than an ordinary chainring to compensate for the ratio 2/3 per revolution of my device.

 In the case of piston engines, this device will directly receive the thrust from each piston which will then have an irregular speed and to avoid possible vibrations, it will be possible to combine the pistons two by two so as to obtain a balance.

 Referring to Figures I from the front and 2 in profile, the axis A is driven and the axis B is driven.

They are placed face to face, parallel and offset.

At the end of the axis B on a circumference (3) perpendicular to the axis, three studs (2) are placed at equal distance from each other. The axis A is offset from the axis B by half the radius of the circumference where the studs are placed, it has at the end perpendicularly two arms (I) placed on each side of the radii of the circle which it describes with a length of diameter equal to the axis of two studs. the thickness of the arms as studs is arbitrary but sufficient for them to support each other. When one arm makes contact with a stud, the other arm loses contact with the previous stud and so on without a sudden. arms in permanent contact with a stud, the same inverted device will be installed. The shape of the arms over the length Or they are in contact with the studs can be of any shape so as to obtain variable and different speed and force ratios between the two axes according to the needs sought dear.

 This device transforms a regular force given to an axis in irregular movement since it offers a different resistance along the length of the lever arm which varies according to the location of the support points of the studs on the arms.

 The invention thus conceived is susceptible of numerous modifications and variants without departing from its protective framework. In particular, FIG. 1 from the front and FIG. 2 in profile are only indicative and should not be considered as engaging for this type of device. which can be applied in a wide variety of modes. All details can be replaced with technically equivalent elements.

 Practically, the materials used, the shapes, and the dimensions can be any according to the needs. This device can work in both directions and the leading can be led as needed.

Claims (1)

CLAIMS Device intended to use a circular movement at variable speed to drive a circular movement at constant speed. Consisting of introducing between a motor axis (A) rotating at variable speed and a driven axis (B) parallel and offset from said axis motor, tournart at a constant speed, a device. characterized in that one of the two axes (A, B) comprises two perpendicular arms (I) of a length (4) equal to the center distance of two of the three studs (2) placed at equal distance on a circumference perpendicular to the other axis. Device according to Claim 4, characterized in that an axis drives two perpendicular arms (I) which themselves drive three studs (2) perpendicular to the other axis. 3 Device according to claim 2 characterized in  that the two axes (A, B) being parallel, are offset  half the radius of the circumference (3) on which the three studs (2) are placed  device according to previous claims  characterized in that the position of the studs (2) relative to  to the arms (1) being variable, modifies the speed and the force  thrust.