US1943396A

US1943396A - Change speed gear

Info

Publication number: US1943396A
Application number: US591374A
Authority: US
Inventors: Quevrain Leon; Quevrain Hippolyte
Original assignee: Individual
Current assignee: Individual
Priority date: 1931-02-12
Filing date: 1932-02-06
Publication date: 1934-01-16
Anticipated expiration: 1951-01-16

Description

Jan. 1 6, 1934.

L. QUEVRAIN ET AL CHANGE SPEED GEAR Filed Feb. 6, 1932 2 Sheets-Sheet l L EKOA/ Jan. 16, 1934. L. QUEVRAIN ET AL 11,943,396

CHANGE SPEED GEAR Filed Feb. 6, 1932 2 Sheets-Sheet 2 I /NVENTOE5 A EON OUEV/PA/N PoL r75 8 y 005 l/AFA) Patented Jan. 16, 1934 CHANGE SPEED GEAR Lon Quevrain and Hippolyte Qucvrain, Paris,

I France Application February 6, 1932, Serial No. 591,374, and in France February 12, 1931 2 Claims.

The subject of the present invention is a novel change speed device which permits a movement of rotation at constant speed to be transformed into a movement of rotation at intermediate speeds comprised between zero and the maximum possible speed, without friction, without declutching, and by simply operating a hand wheel or a lever.

In the drawings accompanying the present description, Figure 1 shows a longitudinal section through the apparatus, Figure 2 is a cross section of the apparatus, and Figure 3 shows another longitudinal section. Figures 4, 5, 6, 7, 8 and 9 show enlarged details of the apparatus.

The device forming the subject of the present invention chiefly comprises a casing 1 having a bed plate at its lower part and a rectangular cavity at its upper part. The casing 1 is closed at each side by two

circular covers

2 and 3 at- 20 tached to the casing 1 by their circumference. The

covers

2 and 3 are perforated at their centre. These perforations form bearings for the driving shaft 4 passing through the cover 2 and the driven shaft 5 passing through the cover 3.

Inside the casing 1 and towards the cover 2 is situated an externally toothed crown 6 adapted to turn in the casing. This crown 6 carries a certain number of sleeves 7, for example eight, arranged concentrically at equal distances apart. At the centre of the crown 6 and rigid with it is located a sleeve 8 serving as a second bearing for the driving shaft 4.

The driving shaft 4 is rotated at constant speed by a pulley, clutch coupling, or other member mounted outside the casing 1.

At the end of the inner part of the driving shaft 4 is keyed a crank plate 9. Upon the crank pin of this plate is freely mounted a sleeve 10 comprising a central groove and pierced with a number of holes equal to the number of sleeves on the crown 6 (eight in the example shown in the drawings). These holes are pierced on the plates on either side of the groove in the sleeve 10 and are arranged concentrically at equal distances apart.

In these holes are situated pins 11 servng as pivots for links 12 which are connected at their other end by pins 13 to the levers 14.

The levers 14, shown in detail in Figures 7, 8 50 and 9, carry at one end a trunnion which can turn freely in the sleeves '7 of the crown 6, and at the other end have a notch 15 pierced with holes which receive the pins 13 of the links 12. On the side opposite the trunnion 13 is situated a rectangular notch 16.

(Cl. 74-54) i In the casing 1 and near the cover 3 are mounted two

crowns

17 and 18 provided with sleeves 19 equal in number and spaced similar to the sleeves 7 in the crown 6, that is to say, eight in the present example.

At the centre of the crown 17 and rigid with it is located a sleeve 20 serving as a second bearing for the driven shaft 5.

The two

crowns

17 and 18 are secured to the casing 1 by means of

pins

21 and 22 in such a manner that the sleeves 19 face each other.

In the sleeves 19 are freely mounted the trunnions of the driven levers 23 shown in detail in Figures 4, 5 and 6. These levers 23 each carry a pin 24 receiving a roller 25 which turns freely and engages freely and without clearance in the rectangular groove 16 formed in the levers 14.

On the trunnions of the dogs 23 are keyed the ratchets 26. Pinions 2'7 turn freely on the trunnions of the levers 23 and carry a side plate 28 which receives the pivots of the pawls 29 and the pins for the pawl springs 30.

Referring to Figure 6 in the drawings, it will be seen that, when one of the levers 23 is given an angular movement in the direction of the arrow shown in the drawings, this lever, by means of the ratchet 26, willdrive the pawls 29 and consequently the pinion 27 will be carried along by the pivots of these pawls. For a movement in the opposite direction to the arrow the pawls will slide over the teeth of the ratchet 26 and will leave the pinion 27 free.

A hand wheel 31 is mounted onthe casing and drives a worm 32 meshing with the toothed crown 6 for the purpose of giving this crown and consequently the dogs 13 a certain angular displacement. This angular displacement is limited by screw stops not shown, in order to prevent the rollers 25 of the levers 23 from disengaging from the grooves 16 and-from the levers 14.

The movement of the driving shaft 4 is transmitted to the driven shaft 5 in the following manner:

When the driving shaft 4 turns in the direction of the arrows shows in Figure 3, the crank pin of the plate 9 will transmit, through the links 12, an angular reciprocating movement of constant amplitude to the levers 14.

The rollers 25 of the levers 23 engaged in the groove 16 of the levers 14 will transmit this angular movement to the levers 23.

The angular movement of the levers 23 will vary in magnitude. according to the distance of the rollers 25 from the centres of the levers 14.

Further, when the angular movement of the levers 23 returns the end of these levers carrying the rollers 25 towards the centre of the ap-- paratus, this movement will engage the pawls of the ratchets 26 so as to drive the pinions .27. These pinions 27 engage with the central gear 33 and thus communicate a movement of rotation to the driven shaft 5 upon which this gear wheel 33 is keyed.

During the angular return movement of the levers towards the upper part of the apparatus,

the pawls slide over the teeth of the ratchets 26.

Consequently the central gear 33 keyed upon the driven shaft is successively driven by the planet wheels 27 and the speed of this drive increases when the rollers 25 are further from the centre of the levers 14. The movement of the shaft 5 is annulled when'the rollers 25 are opposite the centres of the levers 14, thisposition of the rollers 25 with respect to the casing carrying the levers 14 being controlled and regulated by means of the toothed crown 6 actuated by the worm 32 and hand wheel 31.

Thus for a given position of the crown wheel 6 the shaft 4 will transmit to the shaft 5 a movement of rotation the speed of which, for a given machine, will be a function of the distance of the rollers 25 from the centre of the levers 14. This speed will be maintained as long as the distance of these rollers from the centre of the levers 14 is not altered by operating the worm 32. K

By increasing the distance of these rollers 25, the speed will increase, and by reducing this distance the speed will fall until it becomes zerov when the rollers 25 are at the centre of the levers 14, and it will remain zero as long as the worm 32 is left untouched.

This control arrangement thus permits the movement of rotation at constant speed of a driving shaft to .be transmitted to a driven shaft the speed of which can be varied from the possible maximum down to zero at will.

This variation in speed of the driven shaft is obtained without shock and in a strictly progressive manner from zero to the possible maximum, and in a gradually decreasing manner from the possible maximum to zero.

The provision of a fluid tight casing permits the mechanical parts of the device to be constantly lubricated.

The principle of mechanical control described above can be applied to all machines, part of machines or mechanical parts requiring a variation of any kind in speed.

Modifications of details may be made in the construction of the device without altering the mechanical principle of control of the variation of speed described and claimed in the present description.

What we claim is:

1. A variable ratio drive-comprising a driving shaft and a driven shaft, a crown arranged concentrically about and provided with a central sleeve bearing and rotatable on the driving shaft and bearing a ring of equally spaced pivots, a crank pin on the free end of the driving shaft and a plate on this pin, driving levers pivotally connected at their outer ends to the equally spaced pivots and having their inner ends pivotally connected by links to the plate on the crank pin, a ring of shafts arranged concentrically about the driven shaft and each carrying a pinion meshing with a central toothed wheel keyed on this shaft, driven levers secured at one end to the said pinion shafts and having at their other ends a pin and a sliding pivotal connection between the driving levers and the pins on the driven levers, and means whereby the pinions are locked on their shafts for one direction of rotation and are free on their shafts for the opposite direction of rotation.

2. A variable ratio drive comprising a casmg, covers closing the two open ends of the casing, and shaft bearings at the center of these covers, a driving shaft passing through one of these hearings an externally toothed crown turning freely on this driving shaft, a driven shaft carried in the other bearing and carried at its free end inside the casing in a bearing formed in a fixed crown rigid with the casing, a number of equally spaced sleeves formed in the periphery of the toothed crown and a trunnion mounted in each sleeve and carrying at its end a slotted driving lever, a crank pin on the free end of the driving shaft, a plate on this pin and a number of equally spaced links connected at one end to this plate and at the other end to the free ends of the driving levers, a number of bearings formed concentrically in the fixed crown, shafts freely mounted in these bearings, and bearing at their ends driven levers having pins engaging slidably and. pivotally in the slots in the driving levers, pinions on these shafts and a toothed wheel mounted on the driven shaft and meshing with these pinions, and means whereby the pinions are locked on their shafts for one direction of rotation and are free on their shafts for the opposite direction of rotation.

LEON QUEVRAIN. HIPPOLYTE QUEVRAIN.