US784758A - Speed-varying mechanism. - Google Patents

Description

PATENTED-MAR. 14, 1905. M. 0. REEVES.

SPEED VARYING MECHANISM.

APPLIOATION FILED DEC. 21, 1903.

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Milton 0. Reeves I Gbtoww PATENTED MAR. 14, 1905.

M. 0. REEVES. SPEED VARYING MECHANISM.

APPLICATION FILED DEG. 21

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Swuewboa Milton 0. Reeves UNITED STATES Patented March 14, 1905.

PATENT OFFICE.

MILTON O. REEVES, OF COLUMBUS, INDIANA, ASSIGNOR TO REEVES PULLEY COMPANY, OF COLUMBUS, INDIANA, A CORPORATION OF INDIANA.

SPEED-VARYING MECHANISM.

SPECIFICATION forming part of Letters Patent No. 784,758, dated March 14, 1905.

Application filed December 21,1903. Serial No. 186,122.

To (tZZ whom, it may concern.-

Be it known that I, MILTON O. REEvEs, a citizen of the United States, residing at C0- lumbus, in the county of Bartholomew and State of Indiana, have invented certain new and useful Improvements in Speed-Varying Mechanisms, of which the following is a specification.

My invention relates to that type of speed varying mechanisms described and claimed in my Patent No. 603,067, issued April 26, 1898, to the Reeves Pulley Company.

The accompanying drawings illustrate my invention.

Figure 1 is a plan with the driving-belt in section Fig. 2, a horizontal axial section of one pair of disks; Fig. 3, a section on line 3 3 of Fig. 2, and Fig. 4 a transverse section of the old manner of securing the disk to the shaft.

In the manufacture of this type of speed varying mechanisms it is necessary that the disks be secured to the shafts so as to rotate therewith, but also so as to be capable of a free longitudinal movement upon the shafts, and it has heretofore beencustomary to attach the disks to the shafts to permit this movement in the manner shown in Fig. 4, wherein the hub of the disk is provided with an accurate axial bore 11, fitting the shaft. After such bore is made a pair of diametrically opposed axial keyways 12 12 are made in the bore. It has been found in actual practice that the removal of the material for the formation of the keyways results in a slight distortion of the bore of the disk, amounting in some cases to several tenthousandths of an inch, and as a consequence the disks no longer accurately fit the shafts. Consequently after a machine equipped with such disks has been operated for some time the bores of the disks by reason of the constant twisting action of the V-shaped drivingbelt upon the disks become enlarged at their ends and the disks begin to wabble upon the shafts. In practice it is not possible to make the bore smaller than the shaft, then cut the keyways to the desired depth, and thereafter rebore, for the reason that the bore is then I slightly enlarged at the edges of the keyways. This tendency of the disks to become wabbly upon the shafts is especially noticeable in the large sizes of machines, where the disks are sometimes as much as seven feet in diameter, and any lack of accuracy of rotation of the disks is very objectionable for many reasons.

The object of my present invention is therefore to provide an efficient, practical, and accurately-producible means for keying the disks to the shaft in such manner that the bore of the disks will accurately lit the shafts and cannot become distorted.

In the drawings, 15 indicates one of the shafts, and 16 16 a pair of coacting coneshaped disks, each of which is provided with an axial bore 17, which accurately fits the shaft, the bore and the shaft being unprovided with keys or keyways. Secured to or two disks is an enlargement or collar 18, which when keyed to the shaft as shown is rigidly keyed thereto. Collar 18 is provided with a plurality of openings 1.) parallel with the axis thereof and. for convenience of construction preferably tapered, as shown in Fig. 2. Accurately fitting each hole 1.9 and tightly mounted therein is a pin 20, the opposite ends of which are of uniform diameter and which fit accurately in holes 21, formed in the disks 16. By this construction the disks 16 may be caused to fit accurately upon the shaft 15 and are rotated therewith by the action of pins 20, but are still free for axial movement on the shaft. The pins 20 also tend to prevent any wabbling or twisting of the disks upon the shaft. In addition to this the area of the pins increase the wearing-surface, and said pins may even be used to entirely support the disks in position.

In practice I find it advisable to make the collar 1.8 separate from the shaft 15, providing it with a bore 22, which fits the shaft 15 as exactly as is possible and is secured to said shaft by means of a keyway 23 and key 24. In order, however, to secure the collar 18 rigidly in position, I prefer to cast or otherwise form in said hub a slot 25, which is substantially parallel with the bore 22 and parintegral with shaft 15 at a point between the" tially embraces the same. At one end of slot 25, a short distance therefrom, I either cast or bore a hole 26, which extends through the collar axially fairly close to the bore 22, and I also bore between hole 26 and the end of slot 25 hole 27, the axis of which is parallel to bore 22. Hole 27 is slightly tapered. The distance between the end of slot 25 and hole 27 and between hole 27 and hole 26 and between hole 26 and bore 22 is small, so that when a tapered pin 28 is driven into hole 27 the material of the collar will be broken at these three places, thus forming a lip 29 0])- posite keyway 23, which lip is driven tightly against the shaft by the pin 28.

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