US914700A - Method of forming herring-bone gears. - Google Patents

Description

N, A. GHRISTBNSENL METHOD 0F FOBKENG BIEEBBIIG BONE SEARS. APPLIOATIOE FILED JUEE 2B, 1904.

vN. A.`CHRISTENSEN. METHOD 0F FORMING HEBRING BONE GEARS. f AmfLIoATIoNfILED JUNE zo, 1904. 1

91 4,700. Patented Mar. 9, 1,909.

2 SHEETS-SHEET 2.

. UNITED s'rArns-ieannnfrlonnn.

NIELS A. CHRIS'IAENKSEN, OF MILWAUKEE, WISCONSIN.

METHOD OF FORMING H ERRING-BONE GEARS.

Specification of Letters Patent. i

Patented March 9, 1909.

Original application-filed October 19,-1899, Serial No. 734,091. Divided and'this application filed June 5w,

' 1904. Serial No. 213,337.

To all whom it may concern:

Be it known that I, NrnLs A. CHmsTnNsnN,

' a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented certain new and useful lm rovements in Methods of Forming Herringone Gears, of which the following is a speciiication, reference being had to the accompanying drawing, forming a part thereof.

This invention relates to spiral gearing 'of the class shown and described in my applica-- tion Serialhlo. 734,091, filed October 19, 1899, of which my present application is a division.

The main .obj ect oi the invention is to simplify and improve the construction and operation of this class of gearing, and te facilitate and cheapen the manufacture thereof.

It consists in the method or process hereina'fter particularly described, of constructing herringbone gears of sections having reversely arranged spiral teeth and secured together side by side.

--in or rivetin them to ether; Fi 4 is a secg g g g tion indicatedy by the line 4 4, Fig. 5, in a plane parallel with the axis of the gear, and F ig. 5 is a section indicated by the line 5 5, Fig. 4, in a plane-at right angles to the axis of the gear,.showing a iinished gear constructed in accordance with my improved process and illustrating the manner and means of assembling and securing together the component sections of the gear; and Fig. 6 is a view oi a portion of the face of a finished gear showing the arrangement and herringbone form of its teeth.

ln the construction of gearing in accordance with my' process, a number of sections cast like or similar to that shown in Fig. l, are accurately turned true or faced on the sides per en'dicular or at right angles to their axesan their hubs are bored. They are then secured together side by sideI uponffa c Pw.

mandrel a, as shown in Fig. 2, and their peripheral faces are turned in a lathe. The sections having been turned true, are placed with the same mandrel in a milling or gear cutting machine and spiral teeth 'are simultaneously cut therein, the teeth all running one' way, either right or left, as shown in Fig.

2. ln other sections, secured together and turned true on a mandrel-as above ex vlained, spiral teeth running in the opposite irection are cutin like manner.

Holes b, are drilled for bolting or riveting the component sections of each gear` together. ln order to form these holes so that they will exactly register with each other in the component sections of a ear and-such sections when bolted or rivete together will be' exactly concentric and theirteeth *will have an exact predetermined relation to each other, only a part of the holes, for example alternate holes, are primarily drilled in each section, as shown in lFigs. 1 and 3. y

Two sections, one from each group or series, having teeth running in opposite directions and arranged with the holes t oi one section out of register with, preferably midway between, the holes in the other section, and the teeth of each section in the exact desired relation to the teeth of the other section, are clamped together in a centering rin or holder c, as shown in l5" 3. The bo t or 'rivet holes are then comp eted, the drill being guided by the holes previously formed in each section in drilling the additional holes in the other section. Each section thus serves as a jig for exactly'locating and drilling the registering holes in the other section. ln this way the additional holes in each section are formed exactly in line with -the holes primarily formed in the other section, so that when the two sections are bolted or riveted to ether they will be exactly concentric an the teeth of each will be in the exact desired relation to the teeth of the other. The two sections d and c thus pre# pared and drilled, `are then secured together sideby side, by bolts or rivets f, as shown in Figs. 4 and 5, and form in effect an integral herringbone gear, the teeth ofwhose component sections may be arranged to exactly meet each other at their inner ends,l as shown 1n Fig. 6, or may be odset or staggered if de sired.A After the sections are thus assembled and secured together, the gear may be centered b its periphery in a lathe and the bore of its 'hubiinished concentrically with its simultaneously in a number -ofassembled periphery, and if desired, one or more liey vthe rivets pass are preferably countersunk,

manner of performing theseveral operations -ed scope of the invention.

seats may be cut therein.

In the construction of gears of the lar er sizes, the sides of the sections are preferaly recessed, as shown in Figs. 1 and 5, to reduce their weight, save materialand economize in the time and labor re uired to face them. The outer ends of the oles through which as shown in Fig. 4, so that when the rivets aref upset.therein, their ends will be substantially iiush with the webs o r side faces of the gear. y

Herringbone gears constructed in accordance with m invention'as hereinbefore explained, can e made more rapidly and economically and their-teeth can be more acfcurately cut, than when they are made accordingto' the usual ractice, ina sin le piece. By my metho of construction t e angles produced bythe meetingteeth of adjo' sections are sharp and perfectly forme ,a result that cannot be obtained by cutting angular teeth on a gearmade in one piece or having an integrally formed rim. t isobvious also, that by cutting the teeth sections, in the manner hereinbefore vexplained, a gfreat saving ofl time, labor andl eX ense ise ected.

arious cha es in the minor details of construction of t c gear and in the order and hereinbefore described, maybe made Without departing from the principle and intendholes in the other, exactly Vlocating and form-V and forming holes in the other section by the I claim:

1. The method Aof formingr herringbone gears, consisting in cutting spiral or oblique teeth running in opposite directions in separate sections, primarily forming transverse holes in each section, te'm orarily'securing said sections together in t e exact relation they are to `have `in the inished gear, with the holes in one section out of register with the in additional holes in each section bythe ho es primarily formed in the other section, while the two sections are temporarily held to ether in the exact desired. relation vto each ot er, and securing the sectionstogether bv means passing through the holes thusformed, substantially asl described.

2. The method of forming herringbonegears, in sections, consisting in cutting spiral or oblique teeth running -in opposite directions in the separate. sections', primarily forming transverseholes one section of each gear, vtemporarily securing the vsections together in the 'exact relation they are to have in thefinished gear, exactly locating holes primarily formed in the first4 section while the two sections are-temporarily held to etherili the exacty desired relation to each I ot er, and 'finallysecuring the sections toget-her by means passin through the holesthus formed, substantial v as described.

In Witness whereof, I eretolaiiig( my sig# nature in presence of two Witnesses.

i -NIELS A. CHRISTENSEN. Witnesses:

JNO, DADMUN, Cms. L. Goss.

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