US1913989A

US1913989A - Rotary motor tool

Info

Publication number: US1913989A
Application number: US424981A
Authority: US
Inventors: Robert H King
Original assignee: ROTOR AIR TOOL Co
Current assignee: ROTOR AIR TOOL Co
Priority date: 1930-01-31
Filing date: 1930-01-31
Publication date: 1933-06-13
Anticipated expiration: 1950-06-13

Description

June 13, 1933. R. H. KING ROTARY MOTOR TOOL 2 Sheets-Sheei: l

Filed Jan. 3l, 1950 A il . 731, v e nf. @ik

June 13, v1933. R H KlNG 1,913,989

ROTARY MOTOR TOOL Filed Jan. 51, 1930 2v Sheets-.Sheet 2 @e I s,

nu k k @11M MMM@ Patented June 13,1933

1 U'Nlrsnfsrarss temas ROBERT n.'xrne'yorcnnvannnnnnrcrrrs, oHIo; Assreiioa To Auna.Boron lAim' Toor.

' Cor/IPANY, or CLEVELAND, entro, A CORPORATION onoHIo RorARYMoroa Toon' l Application filed Ianu'aryl, 1930. Serial No."424,981. v

This invention relates toa rotarymotor tool and particularlyto such a tool `adapted 'for bufling, grinding, or like purposes.

The main object of the invention is to pro- 5 vide a-rotary motor tool of this character wherein the parts are so constructed and arranged that the handles may be positioned relatively near the'plane ofthe tool proper to thereby effect stability of operation ofthe rotary'motor tool,y thus increasing thel eificiency thereof and improving the control and operation ofthe same.

A further Objectis to arrangein an efficientmanner the. reduction-gearing, valve,

handles, and inlet and exhaust .passageways so 'as to avoid manufacturing complications, y'and to provide ease of operation of the valve and at the same time admit-of the use of reduction gearing, and a housing enclosing the same which addsl little-to thesize of the structure as a'wh'ole; Y .1 v

. A still further object is -to Vprovide a rotary motor toolfof this character which is compact and yetrrelatively powerful 1n operation-'for its size.` A 2 i y The above and other objects are attained by my invention-which may be here briefly summarized as "consisting incertain novel detailsof construction and combinationsand arrangements lof parts which Ywill. be described in the specification A'and set forth in Vthe appended claims. 'l

`In the accompanying' sheets of. drawings illustrating an embodiment of my invention, Fig.- 1 is a lplan view of a rotary-motortooh F ig. f2 yisa longitudinalzsectional view taken on line 2--2 of Fig'. 1, lookingin .the direction ofthe arrows;- ;Fig. 8 is -a fragmentary sectional view `taken on line; fir-Bof Fig. 1, looking in the direction ofthe arrows; and Fig. l is a horizontal sectional view taken approximately on line 4f-Lof Fig. 2 looking i in the direction ofthe arrows.`

be seen that` the rot-ary motor toolherein ill lustrated comprisesa motor housinglO, ai gearhousing 11, la"'plate12 arranged between the two housings, a live handle 13' secured to the motor Vhousingv and th gear `Referring nowrton the drawings and to themainor general construction, it will reduction housing, and dead handle 14 secured to the gearreduction housing and extending at right angles tothe live handle V13. The motorihousing 10 is substantially circularinY shape and 1s Yprovided with an extension 15 which can be called the inletextension and an 'extension`16 which can be called the outlet extension, the housing and the extensions being coredy out so that a cylinder 17 can be pressed into the housing and held in position by lshoulders V.18 engaging the cylinder adjacent its opposite ends. The cylinder 17 Edivides theinterio'r ofthe housing into two, chambers, namely, an inlet chamber 19. and an exhaust -cham ber 20. The inlet chamber 19 is" an elongated vertical chamberformed by the inward extensions 21 of the inlet lextension 15 and thecylinder 17, this chamber 19 communi eating.V adjacent its lower endwitha duct 22 extending. through the inlet extension 15. The exhaust vchamber 20 is arcuate in shape and extends longitudinally of the' cylinder 17, such exhaust gchamber also having outl wardly extending portions 23 at its. opposite ends and arranged -on oppositesides Iof the inward extensions 21 (see Fig. 4) and-conf' nected above the duct 22-by apassage 24 (see Fig. 2) thus forming a continuous cham'- In addition Ato the. support for: the cylinlder f provided by. the shoulders 18 and ,the ends of theyextensions 21, a pair ofinward.- ly projecting ribs I25 and 26.are arrangedin the`r exhaust 'chamber and are coextensive with the cylinder, 17. The rib-25 is provided with a small opening 27, whilethe rib 2 6 is-'of greater widththan the rib 25 and is vprovided with a' cored portion to provide communication between the: partsrof the ex haust 'chamber and also'hasta pin 28 extend ing inwardlythrough lthe' motor housing and vengaging 'a keyway 29 in the cylinder 17 to prevent rotation of the 1atter."'The vexhaust chamber 20 communicates with a passage `3() in .the exhaust extension. 16, such. passage being enlarged adjacent its outer end and threadedv co-receive a threadedl litting 31-to which a' hose vmay be fitted to carry laway the :exhaust -ilui'chv if desirable:9

ves

It will be observed that while the rib 26 is cored out to provide communication between the parts of the exhaust chamber 20, the rib 25 is provided also with a single small opening 27 which effects communication between the parts of exhaust chamber 20 to allow the escape of a small portion of the exhausted fluid. It will be noted that the exhausted fluid which travels through the exhaust chamber 2O in an anti-clockwise direction, as viewed in Fig. 4, will pass through the opening 24 and into the eX- tended portion 23 of the exhaust chamber which is adjacent the passage 30, thus providing a suiiiciently tortuous passage to effect a muiiling of the exhaust fluid. The importance of this muliling arrangement will be appreciated when it is realized that a rotary motor tool of this character is noisy in operation when the exhaust fluid escapes in a direct way and also that the use of a separate muiiling device would materially increase the weight and size of the tool.

The outer end of the cylinder 17 is closed by means of a plate 32 arranged in the housing and machined to fit such end of the cylinder accurately to thereby seal the same. The other end of the cylinder 17 is closed by the plate 12 arranged between the motor housing 1() and the gear reduction housing 11, this plate likewise being accurately nia*- chined so as to effect an eiiicient seal for the end of the cylinder. The plate 12 and theplate 32 are provided with aligned openings eccentrically arranged with respect io the cylinder 17 for the purpose of allowing the motor spindle 33 to pass therethrough, the openings being of lsuch size as to provide a slight clearance between the plates 12 and 32 and the spindle 33. A ball bearing 34 is arranged in the housing 10 above the plate 32 and in such bearing a reduced end-35 of the motor spindle 33 is journaled. The end of the motor housing 10 Vis provided with an opening to facilitate the machining of the housing, which opening is closed by a threaded cap 36, such cap-having a threaded opening for the purpose of supplying lubricant tothe tool, this last opening in turn being closed by a threaded plug 37. i The lower portion of the motor spindle 33, as viewed in Fig. 2, is provided with a vpinion 38 and with a reduced end 39 journaled in a ball bearing 40 arranged in a manner later to be referred to.

The motor housing 10, the gear reduction housing 11 and the plate 12 arranged therebetween are assembled together by means of a series of bolts 41 extending through a fiange of the gear reduction housing and the plate 12 into threaded openings in the motor housing 10. The lower end of the gear reduction housing l1, as viewed in Fig. 2, is reduced and has arranged therein a pair of ball bearings 42 held in separated relationship by an inwardly extending shoulder 43. Arranged in these bearings is a tool spindle 44 the inner end of which is enlarged to form the gear 45, while the lower end of the s indle 44 is threaded, as indicated at 46 in Fie. 2, to receive the tool. The lower end of the reduced portion of the gear reduction housing is externally threaded to receive the internally threaded packing nut 47 which holds in position packing 48 the purpose of which is to prevent lubricant from escaping from the gear reduction housing and prevents dirt from entering the housing from the exterior. A spacing sleeve 49 is threaded on the tool spindle 44 and projects outwardly of` the housing through an opening in the packing nut 47 while a second spacing sleevel 50 surrounds the spindle 44 between the bearings 42. When the tool (not shown) is secured to the tool spindle 44, it will abut the end of the sleeve 49 and the pressure ot the tool will be transmitted through the lower bearing 42 against the inwardly extendinx shoulder 43. The gear 45 is provided witi a centrally arranged countersink within which is the ball bearing 40 above referred to receiving the reduced end 39 of the motor s )indle 33, thus allowing the gear 45 and tie motor lspindle 33 to rotate freely without any driving connection between thesame and to provide a supporting relation between the tool spin rlhi and the motor spindle. The under side of the plate 12, viewedl in Fig. 2, is provided with a downwardly extend ing annular rib 52 forming an annular recess 51 receiving a ball bearing 53. The recess 51 formed by the annular rib 52 is in alignment with an oppositely disposed recess 54 formed in the gear reduction housing 11 and likewise receiving a ball'. bearing A shaft 56 having its opposite ends journaled in the bearings 53 and 55 is providedwith a gear 57 and a pinion 58 integrally lformed therewith, the gear 57 mes iing with the pinion 38 on the motor saindle 33 and the pinion 58 meshing withV the gear 45 on the tool spindle 44. The live handle 13 is connected with the motor housing and the gear reduction housing by means of a connecting bracket 59 secured to such housings by a series of bolts 60 (see Figs. 1, 2 and 4). The bracket 59 has an air duct 61 extending therethrough and communicating at one end with the duct 22 through the extension 15 ofthe motor housing and at its other end with an opening 62 formed in the bracket and extending lat-- erally outwardly thereof through an extension 63 formed on the bracket. The extension 63 is internally threaded to receive a threaded bushing 64 which is permanently connected with` the bracket by means of dowels 65. The handle l13 includes a relatively elongated body 66 having'a reduced threaded end 67 fitting within the internally threaded boreof the Vbushing 64, such body also having a central bore 68 extending therethrough and providedwith an enlarged portion 69. The-outer end of the body 66 is externally threaded to receive an internally threaded nut 70 Vwhich inturn is provided with a threaded opening to receive a iitting 71. The body 66 is likewise provided with a slot 72 extending therethrough and communicating with the enlarged portion 69 of the bore 68, such enlarged portion of the bore having a substantially cylindrical slidable valve member 73 arranged therein and carrying at its outer reduced end 74 a head 75 in the form of a poppet valve. The sliding valve member 7 3 adjacent the reduced portion 74 is provided with two longitudinally extending passageways 76 communicating with a semi-circular passageway 77 located substantially at the middle portion ot the sliding valve member. The inner end of the sliding valve member is provided with a bore 78 communicating with the semi-circular passageway 77 and with the bore 68 through the body 66. A screwpin 79 is secured to the sliding valve member and extends outwardly through the slot 72 in the body 66 and into a diagonally arranged slot 80 'formed in a Ysleeve 81 arranged on the body 66 between an annular shoulder 82 and the inner end of the nut 70 so that when the sleeve is rotated the screw-pin 79 and the valve member 73 to which it is attached will be moved in the enlarged portion 69 of the bore 68 through the body 66 by the engagement of the walls of the diagonal slot 80 vwith the pin 79. A split ferrule 88 is arranged ina circular recess of the sleeve 81 so as to cover the diagonal slot 80 and screw pin 79 to prevent the entrance of dirt into the passageway into the bore through the body 66. Y Thus it will be seen that when the sleeve 81 is rotated in the proper direction, the head or poppet valve will be unseated and fluid may pass into the enlarged portion 69 of the bore around the reduced end 74 of the sliding valve member through the passageways 76 and 77 into the bore 78 ot the valve member and thence into the bore 68 of the body, from which it passes through the opening 62 into the

ducts

61 and 22 of the bracket 59 and motor housing 10 respectively into the inlet chamber 19.

The cylinder 17 is provided with a series of diagonally extending openings 84 arranged longitudinally ot the cylinder and communicating with the intake chamber 19 (see Figs. 2 and 4), thus allowing the fluid `in the intake chamber to pass into the interior of the cylinder 17. The rotor 85 is arranged in the cylinder and is keyed to the motor spindle 83, which spindle, as has been previously mentioned, is eccentrically disposed with respect to the cylinder. `The rotor 85 is provided with a number of guideways 86, in this instance three, extending radially inwardly of the rotor and spaced circumferentially thereof. In each of these guideways is arranged a slidable-blade 87 the outer edge of such blade contacting with the inner surface of the cylinder throughout the longitudinal length of such edge and also having a sealing contact with the plates 12 and 32 at the opposite ends of the cylinder. In addition to the openings 84, the cylinder 17 is provided with a plurality of longitudinal rows of openings 88 communieating with the exhaust chamber 20.

-From the foregoing description, it will be clear that the fluid entering the cylinder through the diagonal openings 84, as viewed` in Fig. 4, will strike against the lowermost blade 87 and will cause the rotor to rotate ina clockwise direction until the blade has nearly reached the rst row of exhaust openings 88, at which time the next succeeding blade will have passed the inlet openings 84, whereupon the fluid which has moved the first named blade will be ree'topass throughthe exhaust openings into the Aexhaust chamber 20, while fresh fluid entering the cylinder through the inlet opening 84 willl cause the second mentioned blade to move around in the same manner as the first mentioned blade.

Since the rotor is keyed to the motor spindle 83, the rotation of such rotor will rotate' the spindle and the pinion 38, such pinion in turn driving the gear and pinion 57 and 58, with the pinion 58 driving the gear45 and the tool spindle 44.

A boss 89 (see Figs. 1 and 8) projects from the gear housing 10 below the top of suchhousing and substantially at right angles to the` extension 68 of the bracket y59 with the horizontal center lines of the extensionand the bossin the same plane. The boss 89 is provided with a threaded recess withinV which a bushing 90 is arranged and permanently secured while the handle 14 is detachably connected to the bushing by screwing the threaded reduced end 91 of the handle into thebushing. The handle is also provided with a number of liats 92 to facilitate its-application to or removal from the machine.

It will be noted that the live handle l13 and the dead handle 14, while arranged substantially atv right angles to each other, lie in the same plane, which plane is relatively near the outer end of the tool spindle 44 to which the tool is to be attached. It will ybe appreciated that this` arrangement stabilizes the rotary motor tool in operation since itY increases the ease and steadiness with which the tool may becontrolled. In tools of this type where lthe handles are arranged ata point relatively remote from the outer end oill the tool spindle, the operation of the tool causes the rotary inotor tool as a whole to wabble to a certain extent, thereby making it diliicult to hold the tool in close contact with the work while exerting pressure to the tool through thc handles. 0n the other hand, with the handles arranged relatively near the outer end oit' the tool spindle, the opera-tor will be able to exert pressure to the tool through he handles and to effectively control the rotary motor tool as a whole since the tendency thereof to wabble is substantially eliminated, thus enabling the operator to more eiiiciently operate the tool and to perform the work desired. This is especially true when an abrasive or grinding wheel is secured on the tool spindle and the rotary inotor tool is used as a facing tool. In specifying in the description and claims that the hand `ls are arranged relatively near the outer end of the tool spindle, it is ineant that the handles are located nearer to the toolv or workin g end than they are to the opposite end or the rotary motor tool as a whole.

While .l have shown the preferred construction and one which operates with high efficiency, I do not desire to be confined to the precise retain; shown but aim in my claims to coter all modifications which do not involve a departure from the spirit and scope of the invention.

I claim:

l. In a rotary motor tool, a motor including a housing and a motor spindle, a tool spindle axially alined with said motor spindle, reduction gearing etween said spindles, a housing' for said gearing and tool spindle, a bracket secured to both housings, a handle projecting from said bracket, and a second handle extending from the second named housing, both handles lying in a corninon plane at right angles to one another and perpendicular to the axis of the tool spindle.

2. In a rotary niotor tool, a motor including a housing having a passageway leading to the inotor and a inotor spindle, a tool spindle axially alined with said motor spindle, reduction gearing between said spindles, a housing for said gearing and tool spindle, a bracket secured to both housings and having a passageway communicating with the passageway in the inotor housing, a handle projecting from said bracket and having a passageway communicating with the passageway therein, and a second handle extending froin the second named housing, both handles lying in a counnon plane at right angles to one another and perpendicular to the axis ot the tool spindle.

3. In a rotary motor tool, a inotor housing and a gear housing, a tool spindle and reduction gearing supported in said gear housing, a motor spindle axially alined with signature.

ROBERT H. KING.