US1366716A - Automatic feed for an air-drill - Google Patents

Description

E. H. CHAPMAN. AUTOMATIC FEED FOR AN AIR DRILL. APPLlc/Irlou mso occ. ls. Isla.

Patented Jan 25, 1921.

4 SHEETS-SHEET I A TTU/WHS Nv Il. l Im Ill@ E. H. CHAPMAN.

AUTOMATIC FEED FOR AN AIR DRILlf..

APPLxcATIoN FILED DEC. I8. 1918.

1,366,716, Patented Jan. 25, I.

4 SHEETS-,SHE

@V2-2. F/GJ.

0//3-3 Fal E. H. CHAPMAN. AUTOMATIC FEED FOR AN AIR DRILI.. vAPPLICATION men DEC. LB. 191s.

1,366,716. V Patented Jan. 25,1921.

4 SHEETS-SHEET 3.

A TTHNEYS E. H. CHAPMAN.

AUTOMATIC FEED FOR AN AIR DRILL. APPLICATIUN FILED DEC. 18, 19|8.

1,366,716. Patented Jan. 25,1921.

4 SHEETS-SHEET 4.

ATTORNEYS UNITED STATES :EDWARD n. CHAPMAN, or BEfriiLErrnivr-l, rnNNsYLvanrA.

AUTOMATIC FEED FOR AN' AIR-DRILL.

Y Specification of Letters llatent.

Patented, Jari. 251.192,41.

Application ler ecember 18, 1918. Serial No. 27,343.

To all whom t may concern.'

Be it lrnoivn that I, EDWARD H. CHAPMAN, a citizen of the United States residing at Bethlehem, in the county of horthampton, State of Pennsylvania, have-invented a nenT and useful Automatic Feed for Air-Drills, of which the following is a specification.

My invention relates in general to the class of automatic drill feed attachments for airand electric drills, or drill presses of various types, in which provision is. made for automatically feeding the` drill into the -Work and for disconnecting the feed mechanism Without affecting the rotary movement of the drill.

More particularly my invention relates to an automat-ic portable feed for drills invented by me and forming the subject-matter of United States Letters Patent No. 1,202,030, granted to me October 24, 19l6,--and, While possessing all of the advantages of myaforesaid feed, comprehends certain improvements in the organization and application to the drill-spindle and gearing which drives said spindle, of the motive mechanism which operates upon the' gearing to effect the control of the drill-spindle relatively to the feed screw.

My invention possesses all of the advan tages which inhere in the portable feed of my patent, and in addition includes a differently. balanced and arranged casing for containing the motive mechanism and also the gears Wwhich control the operation 0f the drill-spindle and theY feed screw, so that the assembly as such is better arranged for certain types of drills, and calculated to be more particularly applicable to a. motor driven. drill as contra-distinguished from one that is portable and operatedby hand.

While all the advantages of my patented feed and the details of its construction, which my patent aforesaid comprehends and particularly claims, are presentin' this new and useful embodiment of them, I have in addition to the organization and balanced arrangement of the casing, devised certain improvements in the organization, application, control'and form of the rocker arm which controls the movements. of one of the idle gears relatively to one of the driving gears and also the movements of a second idle gear and a second driving gear which in this invention as` well as inthat of my patent, cooperate with the iirst named gears.

For the purpose of illustrating my invention, l have shown in the aoco-mpanying drawingsT certain types and embodiments, of 1t which are, at present` preferred by me4 be.- cansein practice they have been found to give satisfactory and reliable results. It is to be understood, however, that the,v various instrumentalities in which myA inyentionfi's embodied can be` variously arranged and organized and that my inventionY is not therefore limited to the precise arrangement and organization of these instrumentalities which are typied in the constructions, illustrated in the accompanying drawings and hereinafter described., i Refer-ring to the' drawings y- Fignre 1 represents a vertical, central, sectionalelevation of a drill embodyingmy inventionf-Vcertain parts being represented in brolren side elevation.

Fig. .2 represents a section on the line 2 2, Figs. l and 5.

Fig. 3 vrepresents a section on the linevv 8MS@ Figs. l and 5. n n n Fig. 4E represents a left-hand end elevation of the machine of Fig. l, the'casing of the motor being indicated in dotted lines.

Fig. 5 represents a section on the dotted line 5-5 of Fig. ai, showing tivo sets of feed gears and means for engaging and disengaging them, certain parts being omitted for the salte of clearness of illustration. i

Fig. 6 represents a bottom plan view of one of the idle gears.

Fig. T represents an edge,y view of the` gear of Fig. 6. L i

Fig. 8 represents an inside view .ofy the casting which is used as a cap to inclose the motor casing as shown in Eig. l.

Fig. 9 represents a. section on line 9.-9 of Eid. 8. i i

Fia, 10 represents the gear sleeve with a portion of the drill-spindle in broken out'- line. i Fig. 1l represents an inverted central section of the cap ofthe motor casing which is shown in Fig. 8, removed from the casing.

Similar numerals of reference indicate corresponding parts.

Referring to the drawings- 1 represents a casing, being a housing of the form shown in full lines in Fig.V 1 and in dotted lines in Fig. 4:, the peculiar form, organization and application of this casing being described late/ron.

Nithin the casing areA the cylinders 2 Within which are the pistons 3, and also the roo connecting rods 3X for the cranks 4 of the crank shaft 5, assembled and mounted in the manner usual in motors of this character and which are typical of motive mechanism generically considered, and adapted through a pinion 6 on the right-hand crank shaft 5, to occasion the rotation of a gear or spur wheel 7 mounted on the hollow drill spindle 8.

9 designates the Vcylindric upper or outer portion of a'r'otatable feed screw, the eX- ternally threaded portion of which is designated 10, 'and the threads of which may be of a predetermined number and pitch, en-

gaging with internal threads 11 formed within the hollow drill spindle 8 which eX- tends longitudinally of the easing within a cylindric bore thereof, the upper bearing surface of which bore is designated 13, the middle 14, and the lower 15. Y

The feed screwY 9 1() at the end opposite A to the drill socket 12 is provided with a conical center 16, retained'by a cap 17 and provided with a ball race 18 intermediate the end of the feed screw and the tip, the latter being adapted to engage a suitable abutment oiold man 19, Fig. l, said center serving when held stationary, to permit of the free rotation of the feed screw.

The drillspindle or drill-carrying meinber is rotatable within the bearine surfaces 13, 14 and 15, of the bore, and a bail race 20 intei'venes between the shoulder 21 of said spindle and the middle bearing 14 of the bore.

rl`he lower end of the feed screw is formed with a pintle 22v which in the downward or outwa rdrmovement of the feed screw enters within a socket 23 formed within the drillspindle, so as to stop the'outward movement of the feed screw.v

The outer or lower end of thedrill-spindle 4terminates in the usual drill socket 12 within which the drill,ibit, or other implement (not shown), engages.

The organization so far described is that embraced in the construction of Fig. 1 of my patent referred to, and the rotation of the drill-spindle 8, in the operation of the tool, is occasioned by the agency of compressed air, or other motive duid, applied to a typical motor of the character illustrated in A Figs. 1 and 4,-or by an electrically operated meten-.either operating through the spur wheel and pinion 6 to edect the rotation of the crank shaft 5.

l rlhe rotation of said drill-spindle is transmitted to the'feed screw the following manually-actuated supplemental controlling gearing, which alsov is illustrated and particularly described `in connection with the construction of Fig. 2 of my said patent, and also in a somewhat similar arrangement in connection with the construction of F ig. 1. lt is here to be explained that in the organization of my present drill, the casing as an entirety is of such a construction that the motive mechanism is disposed in opposition to lthe gearing, in coiitradistinction to a disposition in relative alinement therewith as in the organization of Fig. 1 of my hereinbefore-mentioned patent. For this purpose the casing to be later described presents the disposition shown in Figs'. 1 and 4.

Referring now te the feed-gearing organization which in the present instance l utilize for the operation of my drill, 25 is a feed-gear keyed to the drill spindle 8. rThis feed-gear 2o iieshes with an idle gear 2G, freely revoluble upon a gear stem 27, housed in the cap member 28A of the casing 1, see 1 and 11, and in parallelism with the drill-spindle 8 and feed screw 9-10l This Vgear stem 27, as hereinafter explained, is similar in constructionto a second and parallel gear stem 29.

T he gear stem 27 is susceptible of vertical movement within bearings and 31 within the cap member 28, and above the idle gear Y 26 it carries a vertically movable, rcveluhle driving gear 32, retained in place upon the stem by and between two collars 53 and if he stem 2T entends above and beyond the cap member 28 and is provided with a head or push-button 35. @the driving gear 32 is adapted to engage with a driven gear 3G, see particularly Figs.

1 and 10, formed on the inner end of a hol low, cylindric sleeve 37 terminating in a* hand wheel 38, and adapted to turn freely on the feed screw, as shown in Fig. 1.

rllhis sleeve extends upwardly or voutwardly beyond the cap Vmember 2S of the casing, and while encompassing the smooth portion 9` of the feed screw, encompasses also the upper threaded portion 10 of said feed screw, upon which it is reveluble, so

Vas, at will, through the intervention of a feather 56 hereinafter referred to, toV make it possible manually to turn the feed screw. The driven gear 36 and the sleeve 37 are a unit, and the gear member is in constant engagement or meshed with the drivinon gear 32.

rixiallyparalleling the gear stem 27 is a similarly mounted second gear stem 29,A upon which are mounted another idle gear 41, being a counterpart of the idle `gear .26,

and also another driving gear 42 above said idle gear 41, being a counterpartk of the driving gear32.

Both the driving gears 32 and 42 have bottom clutching faces, respectively designated'l).X and 42X and rboth of the idle gears 26 and 41 have upper clutching faces, respectively designated 26X and 41X, so that according to the lifting and dropping movement of the gear stems 27 and 29, one or the other ofthe idle gears 26 or 41, both of which are in mesh with the feed gear25 on mesme the drill-spindle 8, will be engaged with the driving gear 32 or 4t2 with which it coperates.

.Each of the gear stems 27 and 29 is formed with a transverse slot, respectively designated 43 and 44, whose Walls are en gaged by the ends of a rocker arm 4:5 pivoted at 46 within the cover top 47 of the cap member 28.

ln order to hold the gear stems in their relative opposite positions, when, for instance the gear stem 29,-'shown in Fig. in its elevated position,-is raised, l provide said gear stem 29 with two notches an kupper designated 48, and a lower designated 4:9, into one or the other of which a locking ball or device 50 is adapted under the pressure of a confined spiral spring 51, to be entered. V

The first gear stem 274is shown as provided with but a single notch 52, into which a locking ball or device 53 controlled by a spring 54. is adapted to be entered. Obviously, a pressure upon the head or push button 35 of the` stem 27 will force down said stem, and through the roclrer arm l5 force up the stem 29 into the position shown in F 5, while a depression upon the push button 55 will occasioneJ reversal of position of the parts. temporary holding together' of either idle gear 26 and driving gear 32, or of idle gear Ll1 and driving gear d2, is effected.

inasmuch as, according to the desired direction of rotation of the drill-spindle 8, either the driving gear 32 or the driving gear i2 is, through the clutch of its idle gear, operatively engaged with the driven gear 36 on the thumb sleeve 8; and inasmuch, further, as both of the idle gears 26 and ll are always in engagement with the feed gear 25 on the drill spindle 8, it is obvious, broadly stated, that the right-hand or left-hand rotation of the drill spindle and drill, will be accomplished by the manual movement or pushing in of one of the gear stems to effect the clutching` of the driving gear and the idle gear with which it oper' ates.

56 is a feather or spline in the sleeve 37 and sliding in a featherway 57 longitudi nally recessed partly in the exterior of the feed screw 9-10 and partly in the interior cf the sleeve 37, so that in the rotation of the driven gear 36 and sleeve in one or the other directions, the feed 'screw will be correspondingly rotated.

58 is a bearing washer and spacer encircling the feed screw and separating the driven gear 3G and the driving gears 82 and 42.

Referring now to the casing l, its organi'fzatioay far as it comprehends a cas ing as such for a motive mechanism and as it appears inFig. l, is a matter of large Thus the locking andV importance, and while the details of construction shown in Fig. larewell suited for for the purpose, I do not necessarily conline myself to them. It is, however7 of the essence of my present construction that such portion of the casing as embraces the motive mechanism should be upon a given side of Jthe drill spindle and feed-screw and that the other portion of said casing Within which is confined the manually-controlled supplemental driving gearing should be upon another side, so as to make a double 'compartment and, `so to speak, balanced, casing.

The entire casing and the componentl members of it, in which the motive mecha nism is contained is designated by the number l and its details of construction are apparent from Fig. l.

That Vportion of the casing, however, which is upon the opposite side of the drillspindle and feed screw l have designated as lx, and its details of construction also will be understood from Fig. l.

The casing as an entirety is however, at the end opposite the drill-holding end l2 of the drill spindle 8, confined and inclosed by a cap member 28 which is shown in beth Figs. 1 and l1, in Fig. 1l removed from the casing proper.

This cap member 28 is preferably a casting embodying a chamber 59 of cylindric form, within which are assembled the driving` ygears 32 and 42, the idle gears 2S and 41, the gear stems 27 and 29, the feed gear 25 on the inner end of the drill-spindle 8, and the driven gear 36 on the sleeve 3T.

a cover or top l? incloses the outer end of the chamber 59, and the bearing 13 for the sleeve 37, and also the slide bearings e"lO-31, Fig. 5, for the gear stems 27 and 29, are formed in the cap member.

A cap extension 60 extends radially of the axis of the feed screw beyond that portion of the cap member 28 which contains the chamber 59, to inclose the upper left hand end portion of the casing proper which confines the motor, and this extension has formed within it a bearing 6i for the left hand end of the crank shaft 5.

In the formation of the cap member 28 and its components as justl described, l do not of course confine myself to the exact detail of the shapes or contours described but have found them in practice to be ad vantageous'featnr s of construction.

The operation is as follows z-The object being, as in all drills of this class, to advance and retract the drillcarrying member or drill-spindle against the resistance of the old man or other abutment, the advance and retraction are accomplished by the rotation in one or the other direction of the feed screw. The rotation ofthe drill-spindle through the motor geared to iiby the iis Vcontrol the rotation of the feed screw in one or vthe other direction by connected and manually operated gearing, it will be apparent that because ofthe constant engagement of the feed gear 25 with both of the idle gears 26 and' al, one or the other of said idle gears,'-and whichever one it is that for'the time being is engaged with either the driving gear 32 or 42,-will occasion the'rotation of the drivenV gear -35 upon the sleeve 37, which as explained is in feathered engagement with the feed screw and is therefore capable of turning said feedscrew in either direction according to the direction of its own rotation.

From theforegoing association of gears, it will be obvious Ythat,tlirough pressure upon either the push-button 35 or the puslrbutton 55,]one or the other of the driving gears 32 or 42 will be locked with its idleV gear 6 or lll, andthe rotation of either the drill l spindle 8 or the feed screw 9-10 will, in consequence, be accomplished throng i the connection between the aforesaid drivine` gears and idle gears with thedriven f 8G feathered through its sleeve 37 to the feed screw, and also with the feed gear 25 ou une drill-spindle.

VThe revolutions of the drill-spindle are therefore the same as those of the feed screw Vand drill and reduction in their relative speeds is eected by the dilference in the number of teeth in the gear 35 and those of either 32 or 42. When the reduction is made either through the gear 36 and either 32 or 4-2 or through the gear 25and either 26 or 41, the feed screw is righthanded, with the result that either the gear 35 or the .gear 25 will have one or several more teeth respectively than those of the gears and 4t2 or 26 and il,-tlie relative mimerieal difference being calculated for the required speed of revolution.

pifissuming, upon the other hand, the feed screw to be left-handechthen the gears 82 and 26 and ll2 and lil, will have a greater number of teeth than the gears 3G or bviously, also the feed per revolution will vary according to 'the number of threads per inch upon the feed screw, relatively and correspondently, of course, to the number of the internal threads of the drill-spindle. rlhe operation of returning the drill to its original position after the hole has been bored, is accomplished through the manual operation of one or the other of the gear' stems 27 or 29, occasioning the locking of the driving gears and idle gears with which said gear stems respectively operate.

In case of a right-handed-screw the return is accomplished through the instrumentality of the feather 56 andV featherway 57 acting in the manner already fully eX- plained, whereas in the case of a left-handed screw its return to its originalposition can beV accomplished by the power of the drill itself, a release of the clutched gears theretofore in action being first accomplished and the thumb sleeve 37 being manually held against rotation.

in practice I prefer to employ a lefthanded screw which can be returned by the power of the instrument.

it will be obvious that by employing gears with relatively dierent numbers of teeth and by calculating Vthe numbers of threads per inch Vof the feed screw, any desired revolution of the drill may be obtained.

is already explained, the drill spindle may be rotated by any suitable medium, as my inventionin its broad aspects is applicable to either a rotary piston drill or a reciprocating piston drill, or the rotation of the gear spindle may be effected by electricity or any other Vsource of power.

lt will now be apparent that I have devised a novel-and useful construction of autoniatic drill which embodies the 'features` of advantage einimeratedl as desirable in the statement of the invention andthe above description, and that while I have, in the present instance, shown and described a preferred embodiment which has been found in practice to give satisfactory and reliable results, it is to be understood that such embodiment is susceptible of modification in various Vparticulars without departing from the spirit or scope of the invention or sacrificing any of its advantages.

lrlavingV thus described my invention, what claim as new and desire to secure by Letters Patent, is :-y

1. A drill comprising in combination,a rotatable drill-carrying member,a casing` for supporting said drill-carryingmem bei-, means for rotating'said drill-carrying member, located within said casing upon a given side of said drill-carrying-memberrf and 'manually-controlled supplemental gear-V ing for operating upon said drill-carrying member, located within said casing upon another side of said drill-carrying member.

2.' in automaticdrill comprising in combination :-a drill-carryingmemben-a feed screw, located axially Within said drillcarrying-member.-a casing said drill-carrying-member and said feed screw,`means for rotating said drill-carrying-member, located within said casing upon a given side of said drill-carrying-memfor supporting benand manually-controlled supplemental gearing tor operating upon said feed screw, located Within said casing uponv another side of said drill-carrying-member and said feed screw.

p 3. in automaticdrill comprising in combinationzma rotatable drill-carryi member having at its inner end a iced arf-a feed screw located axially Within said drillcarrying-member and having a driven gear 'feathered to it and to said membeig-a casing for supporting said drill-carrying-member and said teed-screm-means for rotating said drill-carrying member located Within said casing upon one side oit said drillcarrying-member,-and manually-controlled gearing located Within said casing upon another side ot said drill-carrying member and said feed screw, which comprises balanced driving gears in engagement With the feathered driven gear on the feed t screw, and idle gears in engagement with the feed gear on the drill-carrying-member, either one of Which is adapted to be clutched to the driving gear with which it coacts.

a. An automatic drill comprising in combinationz-a rotatable drill-carrying-member having at its inner end aieed gear rotatable With it,-a feed screw located axially Within said drill-carrying-member and having a driven gear feathered to it and to said member,-a casing itor supporting said drillcarrying-member and said feed screw-motive mechanism for rotating-said drill-carrying-member located Within said casing upon one side of said member,-manually controlled gearing located Within said casing relatively oppositely to said motive mechanism, and comprisino' a pair of gear stems upon each of Whic is mounted a driving gear and an idle gear having respectively opposing clutching' yfacedeind means for connecting said gear stems so that when one is depressed. the other will be elevated toY ei'iect the relative clutching and unclutching of each pair of gears upon each stem.

5. An automatic drill comprising in combinationz-a rotatable drill carrying member having at its inner end a feed gear rotatable With it,-a feed screw located axially Within said drill-carrying member and a driven gear Jfeathered to it and to said member,-a casing for supporting said drillcarrying member and said feed-screwmotive mechanism i'or rotating said drillcarrying member, located Within said casing upon one side of said member,-manuallycontrolled gearing located Within said casing relatively oppositely to said motive mechanism,` and comprising a pair of gear stems upon each of which is mounted a driving gear and an idle gear having respectively opposing clutching facesmeans -for connecting said gear stems so that when one rsaid Jreed screw in such manner is depressed the other Will be elevated to eiiect the relative clutching and unclutching of each pair ci gears upon each stem,-and automatic means i'or retaining the gear stems in predetermined different positions.

6. in automatic drill of the character described, which comprises in combination a longitudinalljf--extending drillarrying membeig-a feed screw located axially Within said drill-carrying niemberr-a casing encompassing said drill-carrying member and that their common anis approximately longitudinally cent-"al of said casingg-means tor rotating said. drill-carrying member, located within said casing to one. side oil but so as to partly encompass the drill-carving member and the ieed-screW,-and manually-controlled supplemental gearing for operating upon said leed-screw7 oppositely disposed Within the casing with relad-ionV to the means ntor rotating the drill-carrying member.

7. ln an automatic drill of the character described, the combination off-zi drill-carrying' member,-a vfeed screw Within said member,-a motive mechanism to rotate said member,-a manually-controlled gearing for operating upon said feed screw,- and a casing encompassing both the motive mechanism and the manually-controlled gearing and ot such form as :to support the motive mechanism upon one side of the drillcarrying member and the gearing upon the other.

8. ln an automatic drill of the character described7 the combination ofz-a drillcarrying member,-a feed screw within said member,a motive mechanism to rotate the drill carrying-member,-a manually-controlled gearing for operating upon said eed-scretv,-and a casing encompassing both the motive mechanism and the manually-controlledV gearing and formed With a cap member Which incloses the manuallyactuated gearing.

9. In an automatic drill oi the character described7 the combination o,-a drillcarrying member,-a feed screw Within said member,-a .motive mechanism to rotate said drill-carrying member,-a manually controlled gearing tor operating upon said eed-screvv,-and a casing encompassing both the motive mechanism and the manually-controlled gearing but upon opposite sides of the drill-carrying member, and formed with a cap member which incloses the manually-actuated gearing and embodies a bearing for the outer end ot the drill-carrying member.

l0. ln an automatic drill of the character described,-a casing formed to contain upon one Vside of its longitudinal center a motive mechanism and upon the other side of said center a gearingf-in combination With a drill spindle extending longitudinally llO through said casing,-a feed screw Within said drill spindle,-a motive mechanism for said spindle,and a gearing operative upon said feed screw. V

ll. In anV automatic drill of the character describe.d,a casing formed to contain upon* one side of its longitudinal center a motive mechanism and upon the other side of said center a gearing-in combination with a drillspindle extending longitudinally through said oasing,-a feed screw Within said drill-spindle,-a motive mechanism for said spindle,a gearing operative upon said feed screw-and means for manually controlling said gearing. 4

l2. In an automatic drill of the character described,.a casing formed to contain upon one side ofits longitudinal center a motive mechanism and upon theV other side of said center a gearing-in combination With a drill -spindle extending longitudinally through said casing,a feed screw Within said drillspindle,-a motive mechanism for said spindle,a gearing operative upon drill spindle through said casinga-a feed screw Within said drill-,Spindle-a motive mechanism for' said feed screW,-means for manually controlling said gearing-and means for automatically locking said gearing-controlling means.

13. In an automatic drill of the character deserihed,a casing formed to contain upon one sideof its longitudinal center a motive mechanism and upon the other side of said center a gearing-in combination uwith a .extending longitudinally said spindle,-a gearing operative upon said' lfeed screwmeans foi` manually controlling said gearing,-means for automatically locking said gearing-controlling meansl-and automatic means for retaining the gear stems of said gearing in predetermined dierent positions.

EDWARD H. CHAPMAN.

C. D. MCVAY.

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