US1271207A

US1271207A - Variable reversible shaft-drive.

Info

Publication number: US1271207A
Application number: US17853317A
Authority: US
Inventors: George S Nickum
Original assignee: Individual
Current assignee: Individual
Priority date: 1917-07-05
Filing date: 1917-07-05
Publication date: 1918-07-02
Anticipated expiration: 1935-07-02

Description

G. S. NICKUM.

VARIABLE REVERSIBLE SHAFT DRIVE- A PPLICATION FILED IULY 5-19!!- Patented July 2, 1918 2 SHEETS-SHET 1.

' INVENTORI GEORGE S. NIGKUM.

by: Gal/Z47 1 his Afiorney.

G. S. NICKUM.

I VARIABLE REVERSIBLE SHAFT DRIVE'.

APPLICATION FILED JULY 5. 1911.

1,271,207. Patented Jul 2,1918

2 SHEETS-S GEORGE S. NIOKUM.

Quit/raw his Afiorney. v

GEORGE 5. NICK, F GLENDALE, GALIFORNIA.

' VARIABLE REVERSIBLE SHAFT-DRIVE.

Specification of Letters Patent.

Patented July 2, 191%.

Application filed July 5, 1917. Serial No. 178,583.

to rotate a shaft by intermittently gripping the same, said devices being so operated, to

1 produce this intermittent gripping and rotation, by the rotation of another shaft to which they are connected by suitable operating means- The main object of the invention is to provide imlproved means for regulatin the speed of rotation, for throwing the sha out of operation entirely, and for reversing the direction of rotation, said means bein so constructed that any one of the above e ects may be accomplished by the motion of a sin le controlling lever.

other object of the invention is to provide a device of this character in which the wearing parts are simple and easily accessible so as to permit them to be repaired or replaced when necessary.

Another object of the invention is to provide gripping means which are very quickacting and responsive to any motion of the controlling lever, so as to immediately produce the desired change in speed or direction.

The accompanying drawings illustrate an apparatus emfbodying my invention, and referring thereto:

Figure 1 is a plan view of a plurality of the driving devices in place on the shaft, together with the operating means for said devices.

Fig. 2 is a side elevation of one of the devices mounted on the shaft, and the 0per-' ati means therefor.

Flg. 3 is a vertical-section of one of the devices, taken on line 3--3 in Fig. 4.

Fig. 4 is a vertical section on line in Fig. 3 with the shaft and sleeve removed. Fig. 5 is a artial side elevation of one of the devices, s owing theparts moved from neutral position.

A plurality, for example six, of the driving devices 1 are mounted side by side on a sleeve 2' which is keyed or otherwise connected to the shaft to be driven, indicated at 2. Each of these driving devices comprises gripping means and means for shift ing the position of said gripping means, and

each of said devices is further provided with operating means for imparting an oscillat ing movement thereto and with controlling means for operating said shifting means for the gripping means.

The operating means for each of the devices may consist of a suitably mounted bell crank 3 pivotally connected to a projectin bearing 4 on he device 1, the other end 0 said bell crank being connected to an eccentrio rod 5, which is connected to the strap of an eccentric 6, mounted on the operating shaft 7. It will be understood that the eccentrics 6 for the respective driving devices are angularly displaced about the shaft 7, so as to provide for successive operation of the drivin devices. 2

Each of the driving devices 1 comprises two outer circular plates 10 and 11, between which are rigidly secured two

inner plates

12 and 13, said inner plates being separated by and secured to segments 14' The inner plurality of recesses 15 and 15', whose walls are formed as segments of cylinders and constitute bearings in which are rotatably mounted gripping members or dogs 16, whose inner faces 17 are substantially tangential with respect to the path of oscillatory movement thereof around shaft 2 when the parts are in neutral or inoperative position. Said faces may have a slight curvature either way from straight tangential relation without materially affecting the operation of the device. Rollers or chocks 20 are adapted to move in the spaces between the inner faces 17 of the dogs 16 and the outer surface of the sleeve 2, said rollers being guided, for example, by pins 21 engaging in slots or guideways 22 in the outer plates 10 and 11. The rollers 20 and the inner faces 17 of the dogs 16 are preferably hardened so as to withstand a great amount of wear.

The dogs 16 are provided with projecting sectors 23 extending between the

inner plates

12 and 13 and adapted to swing in the spaces 24 between adjacent segments 14 and having gear teeth 25 at their outer edges, meshing with gear teeth 26 formed in the inner face of a shifting ring 27 mounted outside the segments 14 and between the

inner plates

12 and 13 and adapted, to rotate relative to said members. i

The shifting means for the gripping means may comprise, in addition to the

plates

12 and 13 and the segments 14 have a shifting ring 27, a pinion 30 rotatively mounted between lugs 31 on the outer plates 10 and 11, whose teeth 30' engage with teeth 32 in the outer face of the ring 27. Pinion 30 is provided with a lever 33 extending over the outer surface of one of the outer plates 10 or 11, and having its inner face 34: concave, the central portion of said concave face being concentric with the shaft and the remaining portions of said face being of less radius of curvature than said central portion, or eccentric with respect to said shaft.-

The controlling means for operating said shifting means consists, for example, of a ring 35 loosely mounted on the sleeve 2, so as to rotate independently of said sleeve and independently of the driving portion of the device, and having a projecting portion 36 engaging the inner face 34 of the lever 33. Bin 35 may have an arm 37 opposite said portlon 36, to which is connected a rod 38, and all of such rods 38 may be connected at their other ends so as to be operated by a sin 1e controlling lever (not shown). It will be understood' that there is su-fiicient play between the portion 36 and the lever 33 to permit the oscillatory movement of the driving device to take place without affecting the adjustment of the parts and the mounting) of the gripping members is such as to en-a le them to be retained by friction, in any position to which they may be shifted, notwithstanding the pressure of'the chamber walls 20.

The operation is as follows:

When the parts are in neutral position as shown in Figs. 2 and 3, the rollers 20 fall to the lower ends of the slots 22, and in the oscillatory movement of the driving device produced by the eccentric and bell crank connection above described, the inner faces- 17 of the dogs 16 .will simply slide over said rollers and will cause no motion of the sleeve 2 or the shaft 2.

If, however, the controlling means be so operated so as to rotate ring 35 and move portion 36 thereon to one side or the other side of its central or neutral position, it will engage lever 33 and swing it correslpondingly, thereby rotating pinion 30 and t e shifting ring 27. Said ring 27 operates through

gear teeth

26 and 25 to rotate the dogs 16 in their bearing recesses, so that the inner-faces 17 of said dogs will be inclined or angularly disposed in relation to the surface of the sleeve 2', as shown in 5; Oscillation of the driving device 1 wi 1 now cause the dogs or gripping members on one side of the device (the right side in Fig. 5) to grip the corresponding rollers 20 tightly between said gripping members and the surface of the sleeve 2' during one direction of such oscillation and 1 thereby rotate said sleeve, while during the other direction of such oscillation the rollers names? will be loosened and will slide over said sleeve. The gripping members or dogs on the other side of the device will have no effect when the parts are in this position, but will slide over the rollers as before.

It will be seen that swinging the lever 33 to the other side of its neutral position will cause the dogs or gripping members to be shifted in a reverse dll uction, which will cause the gripping members on the other side of the device to ip the corresponding rollers and rotate t e shaft in the opposite direction.

The device is therefore adapted to transmit motion from the operatin shaft 7 to the driven shaft 2 with any desired ratio between the speed of the two shafts and either in the same direction or in reverse directions.

It will be understood that the driven member or shaft 2 may be an axle, a hub, or other rotating member to be driven.

What I claim is: a

1. In a shaft drivin apparatus, a sleeve fastened to the sha a driving device mounted on said shaft and havin means for causing it to oscillate around sa1d shaft and provided with a plurality of bearing recesses, a plurality o gripping members rotatably mounted in said bearing recesses and having inner faces extending substantially tangentially with respect to the center of the shaft when the arts are in neutral position, a plurality o chocks movably mounted between said inner faces of the gripping members and the surface of said sleeve, and means for moving said gripping members to such positions that oscillation of said driving device will cause said gripping members to grip said chocks between said gripping members and said sleeve so as to rotate the shaft.

2. In a shaft driving apparatus, a driving device mounted on said shaft and having means for causing it to oscillate around sa1d shaft and provided with a plurality of bearing recesses, a plurality of gripping members rotatably mounted in said bearing recesses and having inner faces substantially tangential with respect to their path of motion when the driving device is oscillated and when the parts are in neutral position, a plurality of rollers movably mounted between said lnner faces of said gripping members and said shaft, and shifting means for moving said gripping members so that their inner faces are non-tangential with respect to their path of motion.

3. In a shaft driving apparatus, asleeve connected to the shaft to be driven, a plurality of driving devices mounted on said sleeve, an operating shaft provided with eccentric means connected to the respective driving devices so as to oscillate said driving dev1ces when said operating shaft is rotated, each of said driving devices being provided with a plurality of gripping memto different angular positions with res ect to their path of motion, and control ing means connected to said shifting means to operate the same. i a

4. In a shaft driving apparatus, a driving device mounted on said shaft and having means for causing it to oscillate around said shaft and provided with a plurality of bearing recesses, a plurality 0 gripping members rotatably mounted in said bearing recesses and having inner faces substantially tangential with respect to their ath of motion when the driving device is oscillated and when the parts are in neutral position, a plurality of rollers movably mounted between said inner faces of said gripping members andsaid shaft, and shifting means for moving said gripping members so that 25 their inner faces are non-tangential with respect to their path of motion, said shifting means comprising a ring having gear teeth engaging with said gripping members, and

provided with a projection, and a rocking 3o controlling member having arms adapted to engage said projection to move said ring in either direction for shifting the gripping members either way from tangential position so as to cause rotation of the driving 35 shaft in either direction.

In testimony whereof I have hereunto set my hand, at Los Angeles, California, this 26th day of June, 191

GEORGE S. NICKUM.