US738252A - Eccentric or cam. - Google Patents

Description

PATENTED SEPT. 8, 1903.

No. 738,252. R I STUBBS EGGENTRIG 0R 0AM.

APPLICATION FILED JULY 20. I901. RENEWED JULY 6, 1903.

no MODEL.

III/621101". (Z. @6624,

Pl it UNITED STATES Patented September 8, 1903'.

PATENT OFFICE.

RILEY ASBURY STUBBS, OF DAYTON, OHIO, ASSIGNOR TO THE WAVE SYSTEM BOLTING COMPANY, A CORPORATION.

ECCENTRIC OR CAM.

SPECIFICATION forming part of Letters Patent No. 738,252, dated September 8, 1903. Application filed July 20,1901. Renewed July 6, 1903. Serial No. 164,477. (No model.)

To all whom, it may concern Be it known that I, RILEY ASBURY STUBBs, a citizen of the United States, residing at Dayton, in the county of Montgomery and State of Ohio, have invented new and useful Improvements in Eccentrics or Cams, of which the following is a specification.

My invention relates to eccentrics or cams employed for various purposes and designed to be used in series of two or more upon a common shaft with a certain fixed relation of angular advance one with the other. As an example of such use I may refer to Letters Patent No. 674,286, heretofore issued to me upon an improvement in flour-bolting ma- I chines, wherein a shaft is employed with a series of eccentrics thereon having a fixed rate of advance in angular setting used as a moving element with transmitting mechanism to produce a series of regular successive undulations in a bolting-cloth for sifting purposes. Another illustration isv the eccentrics employed in pairs in the valve motion of doubleacting steam-engines of the ordinary recipro eating type, such as locomotives. Many other such uses will readily occur to any one versed in mechanical constructions used in the various arts. In all such constructions employing a series of eccentrics it is often difficult and troublesome to set the eccentrics in proper relation and equally so to reset them in case of slip, dzc. My invention provides a remedy for both conditions and consists of an eccentric or cam having at one side a concentric recess and at the opposite side a circular projection of diameter corresponding, with said recess and set at the desired angle of advance, both projection and recess having axes parallel with that of the shaft upon which the eccentrics are placed.

It will be readily understood that any number of eccentrics exact duplicates of that described may be set adjacent in interlocking series upon the same shaft, each lateral projection of one fitting into the corresponding recess of the next, and the angular advance from one to another in the series will be exactly uniform throughout a series of any extent. Where the series consists of but two,

the recess on one and the corresponding proectiou on the other may be omitted.

My invention is illustrated in the accompanying drawings, showing in Figures 1 and 2 perspective views from opposite sides of an ordinary circular eccentric constructed according to my invention; Fig. 3, an elevation of two eccentrics interlocked upon the shaft; Fig. 4:, a cross elevation of the same, and Fig. 5 a longitudinal elevation of a shaft with axial sections of three interlocked eccentrics.

Referring to the drawings, A designates a circular eccentric having a concentric recess a counterbored at one side, having the same eccentricity in relation to the shaft-aperture a as the periphery of the eccentric has. At the opposite side of the eccentric A is a projeotion in the form of a circular plate a having a diameter and thickness exactly corresponding with the diameter and depth of the counterbored recess above referred to, but having an eccentricity to the shaft-aperture embodying the desired rate of angular advance over that of the original eccentric A. It will be seen that if a number of such eccentrics are set upon the shaft in adjacent relations, the circular plate of one fitting into the counterbored recess of its adjacent neighbor, the series will be thus interlocked in relations of a uniform angularadvance throughout. The first and last of the series being keyed to the shaft, no fastenings will be required for those intervening. I prefer to make the diameters of the interlocking plate and the counterbore larger than that of the shaft-aperture a and but little less than that of the eccentric A itself, because a series of any number can then be used and the rate of angular advance be maintained without any interruption throughout; otherwise a smaller aperture and corresponding pin might be employed. In such case, however, the number of engaging apertures and pins would be confined to a segment extending a limited distance at either side of the radius of greatest eccentricity.

While I here exhibit an eccentric with a straight cylindrical face, it will be understood that the face may be grooved or ribbed and carry yokes in the usual manner.

It will be obvious that so long as the eccentrics thus constructed are in position upon ICO the shaft S interlocked they can occupy no other relation to each other. Consequently if any one of the series remains keyed to the shaft their proper relation will be maintained so long as they remain laterally engaged. If the keys are lost and slip occurs, the resetting of one insures the proper resetting of the other; but for the reasons given slippage is far less likely to occur.

The improvement may be applied to cams of any form by forming. the hub eccentric and constructing as indicated.

I claim and desire to secure by Letters Patent of the United States 1. An eccentric provided at one side with a circular recess and at the other side with an reacts nesses.

RILEY ASBURY STUBBS.

Witnesses:

JOHN M. PHELPS, ALEXANDER G. REED.

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