US1151220A - Gearing. - Google Patents

Description

@NIT S RUDOLIEI-I C. SCHEBLING, 0F CHICAGO', ILLINOIS, ASSIG-NOR TO HENRY E. BULLOCK AND JAMES E. BULLOCK, IBOII-Iy OF CHICAGO, ILLINOIS.

GEARING.

Specification of Letters Patent.

Patented Aug. 2d, 1915.

Applicationfled October 8, 1914'. Serial No. 865,631.

T0 all whom it may concern.'

Be it known that I, RUnoLrH C. Sonna- LING, a citizen of the United States, and resident of Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Gearing; and I do hereby declare that the following description of my said invention, taken in connection with the accompanying' sheet of drawings, forms a full, clear, and exact specification, which will enable others skilled in the art to which my said invention appertains to make and use the same.

This invention has general reference to gearing, and speciiically to the so-called class of mutilated gears which are designed to intermittently rotate the driven member of such gears. In this class of gearing there is always considerable danger of breaking one or more of the gear teeth caused by the impact of the gear teeth when the driven member is suddenly caused to rotate owing to the inertia ofthe mass which has to be immediately started from a condition of rest to one of motion, which is extremely severe on the first or entrance teeth of a teethsection of the driving gear.

The object of my invention is to remove, or at least to-a great extent avoid this breakage of gear teeth.

Other objects of this invention will hereinafter fully appear.

In the drawings already referred to, which serve to illustrate the preferred embodiment of this invention, Figure 1 is an elevation of a set of gearing embodying my invention. Fig. 2 is an end-elevation of the same, like characters of reference being used in both figures to designate the same parts.

A indicates a so-called mutilated spur gear wheel, z'. e., a wheel having in its face a multiplicity of sections of gear teeth interrupted by blank spaces between the gear teeth sections. In the drawings I have shown two such gear-teeth sections and two of the blank spaces, but it is evident, that only a single teeth section and a single blank section may be employed, without departing from the scope of my invention.

Inasmuch as the gear sections and the blank spaces, when more than one of these sections are employed are alike, I shall conline this description to only one of these elements.

12 designates the rim of the spur gear wheel A, which is assumed to be the driver of a pair of coasting gear wheels, B, being the driven member or pinion. rlhis rim has on its face a section or series of cogs or teeth, 13, and a blank section 14, whereby the pinion B is caused to intermittently rotate while the driving gear is making one revolution, the number of revolutions of the pinion in one cycle depending upon the ratio of the gear-wheels; and the duration of rest, upon the length of the blank space between a jacent teeth sections. rllhe spurgear wheel is, preferably, keyed to the shaft 15; and the pinion B is either fastened to, or formed integrally with, a shaft 16, both shafts being constructed to rotate in suitable bearings, not shown.

17 designates a stud or pin projecting from the Hank of the rim 12. Its location is adjacent to the first or entrance tooth 1S of a tooth-section 13, and it is either formed integral with the rim 12, or made separa-te therefrom and secured to the flank of the rim by any suitable means, 19, such as shown in Fig. l.

2O designates a cam comprising a multiplicity of curved arms, 21, 21a, said cam being secured to the shaft 16 of the pinion in any approved manner. The concave portions 21, 21a, of this cam constitute the operating faces; and the curvature thereof is such that when the spur-wheel is rotated, the pin 17 will strike one of said arms at its root to initiate the rotation of the pinion at a speed slightly in excess of the actual rotative speed of said pinion, the relative position of the cam and the gear teeth of the two gear wheels being-such that the first tooth 22 of the pinion touches the first entrance tooth 13, of the spur gear at its rear flank, so that the teeth enter easily into mesh with each other. rlhe curvature of the cam is such, however, that, as the pinion with its cam rotates and the pin 17 slides on the concave face of the cam, the speed of the pinion slightly increases so that the second tooth 23 of the pinion will contact with the third tooth 24 of the spur-gear at the front flank of the latter, after which the rotation of the pinion will be continued by the teeth section 13. In this manner the teeth of the pinion enter into mesh with those of the spur gear wheel without any ar or blow so that breakage of these teeth is, if not entirely overcome, at least considerably lessened. The

cam 20 is preferably made from a quality of steel possessing great tensile strength combined with the highest degree of ductility; and the pin 17 is preferably constructed from the same material. Both of these elements are also preferably surface hardened to resist wear as much as possible.

I have shown the cam 20 provided with two curved arms 21. This construction is desirable in case where the ratio of the gearwheels teeth is a multiple of the pinion-gear teeth plus one-half, 0r in other words, where a pinion has, say 10 teeth, and the teeth section 13 has 15 teeth. This proviso is required in order to assure that a cam-arm is always in proper position to gradually lead the gear teeth intoy mesh.

In a mechanism of the type described, it is preferable that the pinion or driven member of the gear-train always stops in the proper position for engagement with the starting mechanism described, which, owing to the inertia of the rotating parts driven by the pinion, it might not always do when the driven member separates from the driving means. To secure this positive stopping of the rotation of the driven member at the correct position, I prefer to form on the rim of the spur gear, adjacent to the blank section 14:. a curved track 25, concentric with the shaft 15, and approximately even with the crowns of the teeth in the teeth section. This track projects from the flank of the spur-wheel; and on the pinion shaft 16, adjacent to the pinion B, I form a slide 26, either secured to, or formed integrally with said pinion B. This slide has curved faces corresponding to the curvature of the track, and it rotates with the said pinion; but, as soon as the forward terminal 27 of said track reaches the pinion, the slide 26 will strike this track and stop the pinion and also prevent any accidental rotative movement of said pinion until the rear terminal 28 of said track passes said slide and liberates the same at the moment when the auxiliary starting mechanism described initiates the rotation of the driven member of the gearing.

Having thus fully described this invention and disclosed the preferred embodiment thereof, I claim- 1. In gearing, the combination, of a mutilated gear wheel, a driven member connected to, and constructed to be intermittently rotated by said mutilated gear wheel, and means constructed to initiate the rotative movement of said driven member, said latter means including an auxiliary driving element on said mutilated gear wheel, and an arm on said driven member, said arm having a concave contacting face to impart to said driven member a differential rotative movement.

2. In gearing, the combination, of a mutilated gear wheel, a gear pinion connected to, and constructed to be intermittently operated by said mutilated gear wheel, means, constructed to initiate the rotative movement of said gear pinion, said means including auxiliary driving elements on said mutilated gear wheel and arms on said gear pinion, said arms having concave, curved,

contacting faces constructed for engagement with said auxiliary driving element to impart a differential rotative movement to the latter shaft in alinement with the toothsegment aforesaid, a slidable element fixed to the flank of said gear pinion in alinement with `said curved track, a cam in front of said slidable element, said caml having curved arms, and a stud projecting from the flank of said spur gear wheel and constructed to engage one of the curved arms of said cam at the concave side of said arm, said stud being located adjacent to the entrance-teeth of said spur gear wheel teetl section.

In testimony that I claim the foregoing as my invention, I have hereunto set my hand this 5th day of October, 19111, in the presence of two subscribing witnesses.

RUDLPH C. SCHERLING.

Witnesses: v

MICHAEL J. STARK, JOHN B. SMITH.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C.

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