US1142357A - Transmission-gearing. - Google Patents

Description

R. A. NORLING.

TRANSMISSION GEARINGA APPLICATION FILED SEPT. 18, 1913. 1,142,357. Patendllune 8, 1915.

2 SHEETS-SHEET I.

R. A. NORLING. TRANSMISSION GEARING.

APPLICATION FILED SEPT. 18, 1913.

Patented June 8, 1915.

2 SHEETS*SHEET 2.

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NITED STATES 'Y OFFICE.

BEINHOI) A. NORLING, 0F AURORA, ILLINOIS, ABSIGNOR. TO AURORA. AUTOMATIC y lMVCHINERY COMPANY, OF AURORA, ILLINOIS, A-GORPORATION 01" ILLINOIS.

TRANSMISSIONGEABING.

To alt 107mm it mag' concern Be it known t at I, Rninnonn A. Non- LrNo, a citizen of the United States, and a resident ofAurora, in the county of Kane and State of Illinois", have invented certain new and useful Improvements in Transmission-Gearing; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification. i

This invention relates to improvements in power transmission mechanism, and more 'iarticularly to transmission gearing adapted for use in the construction of power operated' drills, and like implements of portable character'.

My invention embodies a construction and arrangement of power transmitting and speed reducing gearing to be adapted for use in a drill such as is fully described and illustrated in an application for Letters Patent tiled simultaneously herewith to Wit,

lon the eighteenth day or September, 1913,

and bearing Serial Number 790,577.

My invention consists in the matters hercinafter described and more particularly pointed out in the appended claims.

In the drawings, Figure l is a view in longitudinal section of the electric drill embodying the features of my invention, Fig. 2 is an enlarged detail view in longitudinal section of the gear casing and parts mounted therein., Fig. 3 is a.. cross-sectional view taken on line 3-3 ot' Fig. 2, Fig. l is a crosssectional view taken on line lm-l ot Fig. 2.

Referring to the construction shown in the accompanying drawings, the tool embracing a i'orm oit transmission gearing embodying the features of my invention com-l prises the several main parts as follows: A cylindric casing l, containing the motor field coils, armature, brushes, brush holders, and

'Ventilating fan; a gear casing 2 supporting the tool spindle and containing certain gears interposed between the motor armature shaft and the said tool spindle; a center plate or partition ll between said motor casing l and gear casing '2 supporting suitable bearings 'for the gears, spindle, and armature shaft, and a handle rigidlysecurcd, by prefer ence, to the motor casing l, and containingr a manually operable switch (i, and other suit-able electrical connections. The motor Speccation o! Letters Patent.

Patented Jane s, 1915.

Application filed lSeptember 18, 1913. Serial No. 790,578.

structed of aluminum or similar light metal.'

Within the central portion of the motor cas-I ing is supported the field coil S, the same being held securely in place by means of lonfutudinal ribs 1b formed on the inner sur .ace of the casing l, and a clamp screw 8A extending through the lower part of the casing adjacent to the handle Extending longitudinally in the motor casing is the armature comprising an armature shaft 9 upon which is mounted the armature core lOa'nd commutator 10a. The said armature shaft 9 is rotatably mounted within the 1notor casing in the following manner: The rear portion of the said casing. is provided with an outwardly extending, vertical bridge member ll integral with said casing and forming on either side comparatively large openings communicating with the interior ot' the casing. W'ithin the central portion ot the said bridge member is former an annular depression into which is iitted the outer anti-friction bearing l2 Ator the armature shalt. This bearing comprises two concentrically' arranged vcollars or cage members lf2 and l'. The inner collar 12a is preferably pressed upon the reduced extremity of the armature shaft Sand secured in position by means oi' a washer 1S and a nut i3, the latter having screw-threaded engagement with the extremity ol` the said shaft 9. The outer collarlb is loosely fitted within the depression formed within the bridge member in order to permit the desired end play ofy the armature'shaft. YNithin the adjacent surfaces of the collars l2" and 12b' are formed concentric grooves which -form a bearing race for a plurality ot' anti-friction bearing balls l5. -The inner extremity of the shaft 9 lis provided with a partially threaded portion 95k upon which shaft having gear teeth cut on the end portion thereof. 'The pinion 16 extends through an aperture ab in the center plate and projects beyond the same into the gear casing 2. An antiffriction bearingl 17 supports thelad jacent end of the shaft, and is retained within a depression formed within the margin of the. said aperture 4b. This bearing is similar in construction to the hearing 11 hereinbefore described, and for that reason the saine need not be again described in detail. Furthermore, in view of the fact that l have used this type of anti-friction bearing, in the construction of several parts of the device, the saine in cach ease will henceforth bc merely referred to as anti-friction bearings, anda detailed description of the saine being omitted for the same reason indicated above. Immediately adjacent to the outer extremity of the armature shaft 9 and constituting a part of the armature is the before mentioned connnutator 10a. Within the space surrounding the commutator are contained the brush ring 18 with the brush holders 19, 19, brushes and component parts mounted thereon. rlhe construction and arrangement of the brush mechanism is fully described and illustrated in my before inentioned copending application and hence a detailed description of the same is herein purposely omitted.

Surrounding the entire end portion of the motor casing and including the bridge member 11, a cup-shaped brush cover 22 of sheet metal. rl`he margin of said cover 22 ahuts against a shoulder formed upon the motor :asing' 1 by an annular langc 1 upon the outer surface'thereof, and is secured in position in the following manner: immediately above and below the central portieri of' the bridge member l1 are studs 23 and 24 which have screw-threaded engagement with the said bridge member. 'lhese studs eX- tend through vapertures in the brush cover, one of said studs 23 being of considerable length and adapted to carrya feed handle 25 which screws upon the stud tightly against the cover. rEhe other stud is provided with a nut 26 also fitting against the cover. The 'central portion of the brush cover is pressed outwardly to form a depression 22 adapted to accommodate the extremity of the armature shaft 9 and nut 13. The portion of thebrush cover adjacentto the depression 22L bears against the collar 12.a of the anti-friction bearing' and acts to hold the said collar in place. A suitable cover 27 is provided upon the portion of the brush cover forming the said depression and nornially covers an oil hole extending' through the brush cover. rlhe brush cover is further provided with a plurality of small holes 28 for the purpose of admitting air to the interior of tho motor casing l.

At the inner end of the interior space of the motor casing is afan 29, the same cornprising a plurality of comparatively short fan blades 29, which move in an annular space in close proximity to the center plate and the wall of the motor casing. The hub 29b of the fan is mounted upon the armature shaft by means of a pin 30 extending through the said hub and shaft. lWithin the Wall of the motor casinaf is formed an annular channel 31 which surrounds the periphery of the fan. Connnunicating with the channel 31 and extending through the casing 1 are a plurality of annularly arranged holes (not shown) approximately surrounding; the fan. lhe purpose of these holes is to form a moans of disposingof air which is drawn through the inotor casing by the fan, the air entering through the holesI 28 of the brush cover and passing' throughl the motor casingl by means of the spaces formed be` tween the field coils and the` wall of the casing. The current of air induced by the fan carries away the heat generated by the motor thereby preventing the overheating of the same.

Referring new to the construction and arangeinent of the gearing and spindle con. tained Within and supported by the gear casiingand center plate, and embodied' in my invention: An internal gear spindle 32` is mounted Within the gear casing and rotates upon an aXs lying paralleljwith and offsetl from the axis of the armature shaft. The said gear spindle is provided with an annu lar, cup-shaped port-M1132, (Fig. 2), to the interior margin of which is fixed an internal gear 33. 'lhe said `o'ear meshes with and is driven by the pinion 1G vof the armature shaft 9. Adjacent to said internal gear and forming;- a part of said cup-shaped portion 32*L of the spindle 32 is a centrally arranged depression 32", within which is retained an anti-friction bearing` 39: similar in construction to the bearing 11 hereinhefore described. The outer collar 3l of said bearing is held within said depression, and the inner collar 34h is mounted in a stationary position in the following manner: The center plate l is provided With a, boss 35 in axial alineinentwith the internal gear spindle and projects a short distance into the cup-shaped portion 32 thereof. The said boss 35 securely holds a cylindric spindle-suppm-ting bearing meniher or guide 36 within a central bore thereof, said guide being preferably of the forni of a stub shaft one end of which projects into the depression 32h, and the opposite end of which is supported in the said bore of the boss The guide is further provided with an annular peripheral flange or collar 36 at the central portieri thereof which. abuts against the face of the boss 35 and which acts as a retainer for the bearing' il and also serves to prevent the longitudinal movement of the guide in .-1 direction away from the tool spindle. Upon the outer end ist of said guide is tightly iriressl-id the inner collar .34 ol the a.nti-''riction bearing 8e. The remaining integral portion of 'the intei-nal geur spindle 32 comprises a stub shaft B2C ywhich terminates adjacent to ythe Eend Wall 2'ol" the gear casing, there being prorided at that point an anti-friction bearing 37 of the betere described construction, the inner collar member 37 being fixed to the extremity of the said stub shaft portion of the internal gear spindle, and the outer collar 37b, by preference, loosely mounted with an annular seat formed Within the casing adjacent to the said end Wall of the saine. Rigidly mounted upon said stub shaft portion 32 of the gear spindle 32 and adjacent to the cup-shaped portion 32- thereoi, is a gear Wheel or pinion 38, secured by means of a nut and Washer 39 and 40, respectively,` the said nut engaging a threaded portion ot the stub shaft 32c lying between the said Pinion 38 and the bearing 37.

Ext-ending parallel with the .internal gear spindle in the hereinbefore mentioned tool spindle 3, its axis being likewise parallel to the axis of the armature shaft and oiset therefrom in the opposite direction from the axis of the internal gear spindle. rlhe spindle proper consists of a. hollow shaft having at its inner end an enlarged cylindric portion haring the form of an annular flange 3a which surrounds a centrally dis'- posed annular cavity. Upon the outer surface of, and in concentric relation to, this Piange 3 is mounted the spindle gear ll the same being preferably pressed on to an annular bearing` surface upon the periphery of the flange or liollowed out portion 3 ot the tool spindle 3 and retained in position by means of an annular shoulder 3b. The said spindle gear meshes with the pinion 38 mounted upon 'the stub shaft portion ot the internal'gear spindle The said spindle gear 4l and pinion` 38 are mounted upon their respective bearings so that they may be readily removed and a diii'crent sixcdggear and pinion substituted. lnthisu'ay tue ratio of the gears may be changed to cli'ect a `erneuter or less speed ol the drill spindle as described. rThe drill spindle 3 is rotatably mounted within the gear casing by means of bearings arranged in the following manner: lVitliin the outer vportion of the cavity formed by the annular collar 3 is located a roller bearing' l2, coini'irisiuj; a plurality ot' cylindric rollers #32 loosely. retained within a cage 42". rlhe said roller bearing' is interposed and bears upon the elements as follows: il bushing fili is fitted tightly to the vliange 3 and surrounds tlie bearingr forming an outer bearing;` surface .tor the roller 421. rlhe inner bearing surface of the roller engages a cylindric bearingr guide or stub-shaft le similar inform and function. to the guide Slt. The said guido flfl projects a short distance into the cavity of' the tool spindle and is .-supi'iortwl by means oll u. boss l5 integral with .the center plate fl and havingl a. central bore into which extends a portion of the said guide. The `guide lll is further provided Vwith an annular flange lil-n bearing against the face of the boss e5. lVithin the said cavity of the tool spindle and adjacent to the roller bearing is a thrust bearing comprising parte as follows: A ball race lo fits tightly within the inner eX- tremity of the cavity formed by the flange 3 of the tool spindle 3 and comprises a circular plate provided with a concentric groove 'ithin which are netained a lplurality ot bearing balls 4-7. These balls 47 are interposed between said ball race 4G and a circular thrust plate 48 loosely mounted Within the cavity and which plate abuts against the end face of the guide afl.- By this construction the thrust bearing acts transmit the end thrust of the tool spindle to the guide lfl and in so doingr diminishes the friction resulting from the endwise torce exerted by the spindle during thel operation of the drill or other tool carried in the spindle. The tool spindle is further provided with an external roller bearing 49 (Fig. 2), surrounding the same at substantially its central portion and between the annular flanged portion 3 ot' the spindle and Ithe end wall 2a of the casing 2. This roller bearing is of .the usual construction comprising rollers 50 surrounding the shaft and bearing; against bushings 5l and 52 secured to the surface of the spindle and uf'itliin a similar slot termed in the wall oi the easing,` 2, respectively, and roller thrust plates or rings 53 against which the ends of the rollers abut and which are interposed between the ends of said rollers and the shoulder 3l of the spindle and the end Wall ot the casing- 2. The tool spindle projects th rou gli an aperture .formed in the end Wall of the gear casing, there being provided at that point a stuliini:v box 5a, which has scren'threaded engagen'icnt with the inner surface ol an annular iange 2h projecting. outwardly from the end Wall 2 and surrounding' the aperture therein through which the tool spindle extends. lVithin a. lloro termed at the inner end or' said stuliing box is retained a. packing 5.3 ol suitable ma terial, provided 'lor the purpose oi. preventing the escupe of lubricating oil from the interior oi"l the said casing 2. il central bore or socket extends through the outer portion ot the spindle and cornmii'nicates with the curity ot its inner ond. rl`he said soc-liet is oi a. uniform diai'nete aud is provided at its inner end with a plurality of longitudinally extending and diamctrically arranged inwardly projecting ribs or projections 3. This central bore or socket is (lil udlipted to hold the drill chuelr 57, Within the jews 57a o'l which is tightly held the drill or similar tool. llhe ehuclr 57 is pro1N vided with e shank 5Fl adopted to snugly within thev said socket ot the drill spindle' order to retain the drill chuclr in its socket,

the following means ure provided: Upon the outer end of the drill spindle ie mounted a locking` nut GO lie-ving" screw-threaded engagement with the threaded extremity ot the said spindle. y rthe shanlr ot' the drill chuck is provided with en annuler flange 58h against which the locl-nut beers, thus by tightening the loclrnut upon the said flange the chucl: is held in place. The flange 58 also nets to limit the distance which the shank ol the chuel.: muy enter the drill spindle Hochet.

lExtending :it right :ingles to the longitudinal axis oli the motor casing', is el hollow cylindrical extension ld integral with seid motor casing. rlhe said nteneion is pro-- vided with e circular rierginel flange to n'hiel'i is rigidly secured the before mentioned tool handle 5, the same also extending at right ingles to the axis of the motor ce@n inc. rlhe handle comprises e tubular member having tivo cup-shaped extremities and a smaller intermediate central portion serv ing as a grip tor the hand of the operator. ,Slt the upper extremity ot the handle is provideil u 'liunge 5*, registering,- with the flange ot the extension l ot the motor cesinff and through which extends cap-screivs Gl, 6l, by ineens of which the seid hendle is secured to the motor casing. lliithin the handle und adjacent portion of the er:- tension l", are contained the switch 6 and connections. The said switch is preferably oli the 'torno und construction fully described :xml illustrated in my (io-pending applica tion and hence will not be herein described.

l-lithin the lower cup-shuped portion et the handle is an electrical coi'inoction or socket 62 connected with the switch G by ineens ol" the conductor wires The said connection bloei: 62 is adopted to receive e suitable plug attached to u Sul'l'icient length of wire whereby electric current may be supplied to operate the device.

By the construction of en electric drill herein described and illustrated, und more particularly by the construction, and er rangement el' the gearing embodied in my invention, several advantageous results are obtained, umong which may be mentioned the ease und convenience with which the parts muy be reached and removed when it is desired to renew or replace broken or worn-parts; the compact manner in which the mtiting parte are mounted., sind the.

novel und ellicient manner of providing beerings tor the said rotating parts.

I@ne advantage ol particular importance the form or' bearings used in connection with the interruil geur and the drill spindle, consisting1 of the stationary guides 36 and secured to the center plate, and the antit'riction bearings mounted upon them. This conetfuctionl not only permits the external gear und drill spindle to have adequate bearings to atfi'n'd the least loss ol power by friction, but maires it possible to locate bear`- ings which are u sutlicient distance apart to accurutely center und brace the spindle entirely within the geur and spindle, the result being that the most light and conipuct arrangement is obtained, whereby the eine ot' the gear casing is materially reduced, the entre `weight ot bearings likewise ma# teriully reduced, und the highest possible degree oi efiieiency is obtained. rlhe gear euse ie easy oi' access, so that the geur Wheel 39 and pinion 3'? muy loe removed und others substituted it o change in the geur ratio is desired. `llurthermore., the i'nterposing oit the internal gear spindle between the ermeture shaft und the tool Spindle enables u considerable reduction ot' speed to be obtained. thereby permitting the use of a high speed motor, yet the speed of rotation of the tool spindle is sui'llciently low to insure the proper operation of the tool. Again, the spindle gezirlll and pinion 38 ot the geur spindle 32 being removable, the same may be eusily replaced by gear wheels and pinions of various ratios us already suggested, thus the speed of rotation of the tool spindle can be easily changed us the various classes or" ivorli' muy require.

Further features of construction embodied in theitorm of drill herein described and illustrated, coi'isiitutes the subject metter of the betere mentioned eo-pending application.

ll ein aware that the construction and un rangement of the power trunsmitting mechanism embodying my invention may be vuriously modified without departing from the spirit o' my invention, und Jfor that reason l' do not wish to be limited to the specific construction herein described und illustrated in the accompanying drawings, except in so tar as it is specilically pointed out in the appended claims.

claim es my invention:

l. The combination 01"" e driving member, n driven member provided. with a gear Wheel, e rotative geel spindle parallel With seid driven member und in operative connection with said driving' member, said gear spindle being provided et one end with un annuler depression, e pinion mounted on seid pression and the other end of said `gear spindle, said pinion meshing with the gear Wheel of the driven member, a fixed cylindric bearing guide projecting into said depression, and an anti-friction bearing retained in said depression and supported by said bearing guide. i.

jl. The combination of a driving member provided with a pinion, a rotative driven member, a gear spindle in parallel and offset relation to the axis oi. said driving member, said driven member and gear spindle being provided with intel-meshing gear Wheels and at their adjacent ends with cylindrie shaped depressions, fixed cylindric bearing guides in axial alinement with said driven member and gear spindle and projecting into said depressions, anti-friction bearings mounted in said depressions and supported by said bearing guides, and a gear member upon said gear spindle located outwardly beyond the depression tleereoi:l and meshing with the pinion of said driving member.

3. The combination of a driving member provided with a pinion,'a rotative driven member, a gear spindle in a parallel oifset relation to the axis'o the driving member, intermeshing gear Wheels upon said driven member and gear spindle, the same being provided with annular depressions at their adjacent ends, fixed bearing guides in axial alinement with said driven member' and gear spindles and projecting into said depressions, anti-friction vl'iearing members mounted in said depressions and supported by said bearing guides, and an internal gear wheel upon the marginal. portion of the recess ot said gear spindle and located outwardly beyond the adjacent bearing member, said intei-nal gear Wheel meshing with the pinion of said driving member.

i. rEhe combination o'i: a driving member provided with a pinion, a rotative driven member provided with a gear Wheel, a rotative gear spindle comprising an endwise opening cup-shaped portion at one end thereof, a stub shaft integral therewith, an internal gear secured to the marginal portion of said cup-shaped portion and meshing with said driving pinion, a central degression formed in said cupsiiaped portion immediately inward from said internal gear wheel, a fixed cylindric bearing guide projecting into said depression, an anti-friction bearing in said depression and supported upon said bearing guide, an anti-friction bearing at the end of said stub shaft, and a pinion removably mounted upon said stub shaft meshing with the said gear Wheel of the driven member.

5. The combination of a driving member provided with a pinion, a rotative driven member, a gear Wheel removably secured to said driven member, a rotative gea-r spindle parallel with said driven member, the same comprising an endwise opening cup-shaped portion and a stub shaft integral therewith, an internal gear mounted upon the marginal portion of said cup-shaped portion, an antitrietion bearing retained in the inner portion of said cup-shaped portion, a pinion removably mounted on'said stub shaft and meshing with said gear wheel of the driven member, and a iixed cylindric bearing guide projecting into said enp-shaped portion and supporting said anti-friction bearing.

In testimony, that l" claim the foregoing as my invention I affix my signature in the presence of two witnesses, this 4th day of September A. D. 1913.

REINHOLD A. NORNG.

\Vitnesses:

C. S. Mooney, M. J. BUnKnL.

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