US650815A - Variable-speed friction-gear. - Google Patents

Description

No. 650,8l5. v Patented June 5, I900. J. ARTHUR.

VARIABLE SPEED FRICTION GEAR.

(Application filed Sept. 27, 1898.)

(No Moqiel.)

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I UNITED STATES PATENT OFFICE.,

JAMES ARTHURQOF N'EW'YORK, n. Y.

VARIABLE-SPEED FRICTION-GEAR.

SPECIFICATION forming part of Letters Patent No. 650,815, dated June 5, 1900.

Application filed September 27,1898. filerial No- 691,993. (No model) To all whom it may concern:

Be it known that 1, JAMES ARTHUR, a citizen of the United States, and a resident of New York, in the county of Kings and State of New York, have invented certain new and useful Improvements in Variable-Speed Fric= tion-Gear, of which the following is a specification.

This invention relates to variable-speed friction-gears and it consists in so arranging and operating the power-transmittin g friction-pulleys of the two driving-disks relatively to the driven disk that the driven disk may and will be rotated in opposite directions from the two driving-disks and be thrown out of gear with both of them by the sliding of the friction-pulleys beyond and clear of its sides and at the time when the friction-pulleys of the driving-disks are at the smallest operating circles of them and the driving-pulleys be gradually started and stopped when brought into gear with and when disengaged from either of the driving-disks.

To more fully describe the variable-speed and power-transmitting apparatus embodying the above and other minor features of construction, I will refer to the drawings, in which-- Figure 1 is a side elevation of the reversible variable-speedfriction=gear made according to my invention. Fig. 2 is a plan of the same, and Figs. 3 and 4: are modifications of the friction-pulley-controlling device.

The disks to, k, and b are mounted on shafts a, k, and b, respectively, which have their bearings in frames projecting from the baseplate 0 and are so arranged as to cause an alinement of the disks or a rotation of them Motion is imparted from disk at to the disk I) by means of friction-pulleys cl d and shafts e, to which they are secured. These pulleys d (1, formed of a suitable tenacious and gripping material, bear against the sides of the disks 0. and b and are so spaced that when the one bearing on disk at is near its center the other one is near the periphery of the disk I), so that under these conditions the ratio of speed between the disks, or being the driver, is as the smallest diameter of a is to the largest diameter of b, and this speed may be gradually changed by the longitudinal adjustment of the shaft 6 and friction-pulleys d d to awratio of speed as the largest diameter of a is to the smallest working diameter of b, all variations of speeds between these two ratios being available. In the application of this principle of varying speeds it is preferred to place opposing friction-pulleys dand d on the two sides of the disks a and b, so that :the clamping pressure on each side of the disks will be resisted by a similar clamping pressure on their other sides, thereby increasing the frictional contact-surfaces, and consequently the power-transmitting capacity, of the apparatus and removing from the shafts a and b and their bearings all end strains and thrusts. The shaft a of the driving-disk a is provided with a pulley and belt f. The shaft 1) of the driven disk I) may also be provided with a pulley, so as to transmit power and speed by the usual belt attachments to the machine being driven when these improvementsare embodied in a detached apparatus, or the shaft 1). (shown broken in the drawings) may be a part of the machine being driven.

Each of the shafts e of the friction-pulleys d d has its bearings in a frame g, pivoted to ears projecting from the slide h, which works in ways formed on the bed 0, said frames g being drawn together at their upwardly-extending ends by means of a bolt and nut 2'. By the adjustment of this bolt and nut the friction-wheels cl (1 are caused to bear against the sides of the disks with the desired degree of pressure to cause them to transmit the necessary power. A fiexible block or spring is placed under the nut of the bolti to'afford a yielding resistance to the pressure between the friction-wheels and disks and tocompensate for any slight irregularities in the working parts. The disk is is arranged in' the same plane as the disks a and b. It is mounted on a shaft is and is designed to be used as a driver, being actuated by the pulley and belt Z. Another set of friction-pulleys 'n' on shafts 0, carried by frames 19, pivoted to the slide q, impart motion from'this disk It to the central driven disk I). The pulleys an are caused to grip the sides of the disks bythe adjustment of the bolt and nut '5 in a manner similar to the pressure applied to the pulleys d d.

Between the slides h and q is fitted to move transversely on the bed the slide r, which is actuated and controlled by the lever r. This slide 7' has slots 0' and r formed in it, in which rest studs projecting from the extensions h and q of the slides h and q, these slots being so formed that when the slide r is in its central position the slides 7L and q are held in their most backward positions, with their friction-pulleys d and a clear of the central disk Z1, so that with the parts thus set no motion is imparted to the disk I) from either disk ct or disk 75. Now when the slide is moved forward by its lever of the inclined part of the slot 0' moves the slide q and its friction-pulleys inwardly, the pulleys a sliding over the edge of and gripping thesides of the disk I), initially imparting to this disk its lowest velocity due to the speed of the disk 70. lVhen the slider is moved out to its fullest extent in this direction, the pulleys a will impart the maximum speed to the disk I). In the drawings the pulleys n n are shown about midway of the respective disks. lVhile this forward movement of the slide 7* and the reverse movement of the same is occurring, the slide his held stationary, with its pulleys (1 clear of the disk Z), by the stud on the extension h of the slide it being controlled by the part of the slot T which is parallel to the direction of movement of the slide r. For a Similar reason when the slide 0 is moved in the other direction from its central position the inclined part of the slot r causes the inward movement of the slide it and the consequent gripping of the disk I) by the frictionpulleys d, the pulleys n n at this time be ingheld clear of the disk I) by the stud on the extension q of the slide g, which is then in the parallel part of the slot r By this arrangement it will be seen that the driven disk I) may at will be left free or be rotated in either direction in accordance with the directions of rotation imparted to the two driving-disks a and 7;.

It is proposed to make a sufficiently-loose fit of the pivotal connections between the frames 9 g and slide hand between the frames 19 1) and the slide 1 that when the pulleys d and n are set so as to clear the disk I), as shown at the left end of Figs. 4 and 5, they will close somewhat together in the spaces between the disks and relieve the disks (6 and k of the pressure of their respective frictionpulleys. The apparatus adapts itself for use as a single-acting variable-speed gear of increased power simply by the substitution of the-slide s, Fig. 3, for the slide r and reversing one of the driving-belts of the disk a or 70. This slide 8 has its slots .9 and .9 into which fit the studs of the extensions of the slides 71 and q, inclined in opposite directions from one end of the slide to the other, so that upon the movement of the slide the friction-pulleys d and n are caused to grasp and move over the sides of the disk 1) toward its center and move away from its center toward and clear of its periphery simultaneously.

At Fig. 4 another modification of the frietion-pulley controller is shown, which consists of a lever 2, adapted to be pivoted to the bed 0 between the slides h and q and provided with arms 1/, t which may be connected to the slides h and g, respectively, by the rods u and u, the said arms being so arranged that when the lever i is moved in one direction say toward the rightthe are through which the arm t moves ,will be such as to impart to the slide 1 its full movement and cause the pulleys a to travel the full desired distance over the disk Z), while the equal are through which the arm 1 moves will be in such directions as to cause but slight movement of the slide 7L and its friction-pulleys d, and vice versa, the spaces between the disk I) and disks (1 and 76 being sufficient to permit of the slight movements of the friction-pulleys without said pulleys coming in contact with either of them.

I claim as my invention 1. A variable-speed friction-gear comprising a driving and a driven shaft, a disk secured to each of the drivingand driven shafts, and connected motion-transmitting frictionpulleys arranged to bear against the sides of the disks, means for setting said friction-pulleys in different positions on the sides of the disks so as to change the relative speed of the disks and for moving the friction-pulleys beyond and clear of the sides of one of the disks, whereby the driven disk and its shaft may be stopped at will without stopping the driving-shaft.

2. A variable-speed friction-gear comprising three disks arranged in one plane, parallel shafts carrying the three disks, connected friction-pulleys in two sets arranged to'bear against the sides of the disks so as to impart motion from the two outside disks to the central disk, means for moving the sets of connected pulleys of each outside disk and central disk to cause them to progressively bear on increasing circles of the outside disk and decreasing circles on the central disk and vice versa. and for moving the pulleys acting on the central disk out of contact therewith beyond its periphery, whereby the central disk may be disconnected from both of the outside disks or connected to only one of them.

3. A variable-speed friction-gear comprising three disks arranged in one plane, parallel shafts carrying the three disks, two sets of friction-pulleys secured to shafts arranged at right angles to the disk-shafts so as to impart motion from the two outside drivingdisks to the central driven disk, a slide for carrying each set of friction-pulleys and their shafts, another slide arranged to move at right angles to the friction-pulley slides and provided with slots into which extend studs projecting from the other slides whereby the friction-pulleys are set and held in different positions against the sides of the disks and means for moving the slotted slide.

4. A variable-speed friction-gear comprising three disks arranged inv one plane, parallel shafts carrying the three disks, two sets held stationary beyond the periphery of the driven disk while the other set is in operative position to impart motion to the driven disk, or both sets of friction-pulleys held .clear of the driven disk, and means for moving the slotted slide.

Signed at New York, in the county of New York and State of New York, this 22d day of September, A. D. 1898.

JAMES ARTHUR.

Witnesses:

CHAs. STRAEHLE, ALFRED SHEDLOCK.

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