Replaceable annular gear

Claim 1

A power transmission device, including, a drive shaft, a driving gear having an annular hub, rotatably mounted on said drive shaft, a first annular gear integral with said annular hub, at least one plane, annular, lateral face, formed on said first annular gear, concentric therewith, a clutch rigidly secured upon said shaft adjacent to said annular hub, and having an exterior, circumferential surface, exterior gear teeth formed on said circumferential surface, and a drivable, annular sleeve gear mounted on said clutch hub and having interiorly formed gear teeth to mesh in axially slideable engagement with said exterior teeth, whereby a drive may be transmitted from said sleeve gear through said clutch hub to said shaft, of a second annular gear carried by said annular hub to transmit a drive to said annular sleeve gear, said second annular gear having teeth formed of an annulus, having opposite parallel side surfaces, and having a predetermined interior diameter, the length of said teeth extending the width of said annulus, an annular sUrface formed on said annular hub and extending axially and transversely to, and intersecting, said lateral face of said first annular gear, said annular surface rigidly receiving said annulus, and said annulus being disposed to abut one said parallel side surface against said lateral face of said first annular gear, so that one end face of each tooth abuts said lateral face, and said sleeve gear having at least one plane lateral face and being axially slideable on said clutch hub to engage said interiorly formed gear teeth with said teeth of said annulus, and to abut said last mentioned lateral face against said first mentioned lateral face whereby to engage the full length of said teeth of said annulus, and to resist further sliding travel of said clutch hub.

Claim 3

The method of replacing an annular set of teeth on a gear, wherein said gear includes a hub with a first annular gear formed thereon, said first annular gear having at least one plane, lateral, annular face, and a second gear formed on said hub of smaller diameter than said first gear, and spaced therefrom by an annular groove, and wherein said smaller diameter gear is formed with teeth of smaller dimensions than said first annular gear, and subject to rapid wear, said method including the steps of removing the worn teeth of the second gear in such a manner as to provide an annular surface of predetermined diameter, formed to intersect with said lateral face, forming an annulus having an interior diameter corresponding to and receivable upon said annular surface, and having opposite lateral faces, securing said annulus in a desired position on said annular surface so that one lateral face of said annulus abuts said lateral face of said gear, and the opposite lateral face of said annulus occupies a plane outwardly of the corresponding lateral face of the removed worn teeth, and forming on the exterior surface of said annulus a predetermined number of gear teeth of predetermined dimensions, the length of said gear teeth extending the width of said annulus.

Claim 4

The method of replacing an annular set of teeth on a gear, wherein said gear includes a hub with a first annular gear formed thereon, said first annular gear having at least one plane, lateral, annular face, and a second gear formed on said hub of smaller diameter than said first gear, and spaced therefrom by an annular groove, and wherein said smaller diameter gear is formed with teeth of smaller dimensions than said first annular gear, and subject to rapid wear, said method including the steps of removing the worn teeth of the second gear in such a manner as to provide an annular surface of predetermined diameter, formed to intersect with said lateral face, forming an annulus having an interior diameter corresponding to and receivable upon said annular surface, and having opposite lateral faces, securing said annulus in a desired position on said annular surface so that one lateral face of said annulus abuts said lateral face of said gear, and the opposite lateral face of said annulus occupies a plane outwardly of the corresponding lateral face of the removed worn teeth, and forming on the exterior surface of said annulus a predetermined number of gear teeth of predetermined dimensions, the length of said gear teeth extending the width of said annulus.