US2375490A

US2375490A - Rotary power tool

Info

Publication number: US2375490A
Application number: US443743A
Authority: US
Inventors: Charles F Overly
Original assignee: Individual
Current assignee: Individual
Priority date: 1942-05-20
Filing date: 1942-05-20
Publication date: 1945-05-08
Anticipated expiration: 1962-05-08

Description

May 8, 1945. c:.F. ovERLY ROTARY POWER TooL Filed May 20, 1942 2 Sheets-Sheet 1 INVENTOR. K CHHRLE'S 'F'- OVERLY vMay 8, 1.945.- c. F.'ovER| Y ROTARY POWER TOOLv Filed May 20, 1942 2 Sheets-Sheet 2 FVG-12 INVENTOR.` CHHRLES F'- 0VRLY Q wm,

.wmeniben` l l, l p I Fig. 5 Vis a, fragmentary side-view, partly in ymi Patented May 8, 1945 ROTARY POWER TOOL CharlesrEvOverly, East Cleveland, Ohio Application May zo, 1942, serialrNo.44s,743

fjTliis invention l"relates in general to rotary powerj tools r and imore' particularly to rotary power tools with pneumatic, governor-controlled motors, in whichj tools the' governor controls the", airsupply to them'otor.. Inthese tools the gov- 3:5 I ernors,l when' Iconstructed as so-called through- ."gove'rnors, effect disturbing turbulent air streams which decrease the efliciency of the power'tool, and, when constructed to cooperate with station- The general object of the present invention is the provision-of a simplied rotary power `tool of 'thetypejreferred tol above,fin which tool then A 'rotor of vthe motor mounts' the governor and its ul5 valve to decrease wear andtear-'On the governor and its valve by 'eliminating rotary movements between `these elements. general object of the inventionv is attained y by arranging'the governor valve within the r'otorJZO 'for its-'shaft invsuch a manner that the rotor o`r its'shaft forms the valve body for the governor valve which rotates jointly with rotor ,and gov- Yernor. l Q

lAnotherobjeot of the present inventionthere- 25 yfore vis'the provisiony of a rotary'toolfv embodying a: governor.- directly coupledwith the rotorof its :motor and a governor valve axiallyalignedwith aand arranged with respect to the rotor Or-its shaft, so that'the latter forms the valve body'so `for the'governor valve. V

In addition,- .the `invention has Aother marked superiorities which radicallydistinguish` it from y These improve presently known structures. ments embodying certain novel-features of con- Astructionjarer more clearly` set forth in the following specilcation'and the appended claims,

Yand twol preferred'em'bodiments of the invention are `:hereinafter shown ywith reference to the 'acl'c'ompanyin'g drawings iormingpart of the specihandle member'of the tool shown in Fig. '1.

Fig. `3 isl a side-view of the governorand Fig 3a 50 is aiperspective view of the` governor. N Fig. 4 is av side-view ofthe rotor and shaft elevation, of the driveshaft.'` t.' l

and controlheadjand 1 Fig. `9 is a yfragmer'itaryside-view offthe Vfront head` f .Y vary'valve elements, are ,subjected to excessive (To weara'ndtear.

II-Afef Figi. f-

l `f'Fig.12 is a transverse sectional viel t Online Fig. 16 is a fragmentary, longitudinal sectional fview-of Va rotary power tool embodying `a somefwhat modifiedgovernor and governor valvear- Fig. 6 isa side-view ofthe control and handle head. f f

therotor.' l j *Fig-8 is' a side-view ofthe assembled cylinder Fig. -10 is a transverse sectional viewonline lo-Intime 1. 1 j fjf Fig. 11=``s-a transverse'sectional yviewuon line Fig. 15 is a transverse `sectional view Online rangement mounted according totheinve'ntion'.

Figs. 17 and 18 are side-views ofthe governor Valve stem and governor valve of the shown distributing lbushing, of such tool.v

j Referring now more particularly tofthe-e'xem- Va control head 4, alcylinder section Stand afront' ihead 6. "This power tool has arrangedin itscylinder section 5a pneumatic motor 1 embodyirig a cylinder 8 with inlet and outlet passages `9l and 9. Cylinder 8 which is eccentrically relatedito theaxisqof-the tool `carries in, its working chamber Il) afrotor II arranged ,concentricallyf with respect toysaid axis, which rotor is providedzwith afplurality of blades I2 slidably arranged in vslots I41forloscil1ation in said slots during rotationof the rotorall as customary in the art. Therotor ,II-i is. formed with two shafts I Sand I6 integrally extended from its opposite end faces, which shafts are 'axially aligned with eachother and support 'the rotor in ball bearings ITand I8 mountedin control `head 4 `and `front head `6 respectively.

The shaft I 5, which is extended into control'head 4, carries at'its end a governor I 9 embodyingfa base memberru having a tubular,' threaded :portion, threaded upon the lthreaded end `2 l""of,sl'1`aft I'5, Aand weighted governor arms 22' piv'ota'lly couv.

. p1ea with the base member zu .by pins, 2'3. This l v 30 in handle member 3, which member Caresat l` governor actuates upon a piston-like governor i l valve 24 which is slidably `arranged in a bore 25 'in shaft` l5 to permit its upward shifting when i airunder pressure enters said bore and its down- I ward shifting when centrifugal force shifts levers 2 26 of the governor arms toward the end of shaft I5. The bore inshaft vl5 forms a valve chamber y for governor valve 24 and is provided with openings 2128v varranged below valve .24 .in .spaced relation @vil-h1 respect to each otherlengthwise vof shaft 1 5. Governor valve 24 is provided with f 66 and 6l forced toward each otherk .by a n'ut member 68. l

Preferably, as shown, cone-shaped strainer 46 is closed at its lower endby a readily removable set screw 69, so as to permit of proper cleaning and blowing out of the strainer by air whensaid 'set screwlQ has been removed.

The thus constructed rotary power tool which can readily and easily `be assembled and disassembledlpermts of ready access to pneumatic lmeter '1 andgts goveriiicir'll-S. fThus; by'unscrew- I ing'fbo'l'tsv 10 :connecting handle member 3 with a head portion 23 and dimensioned to partlyuor'` fr Air is fed .to motor 1 tnreugn'an .en 'pessage ythe rotary speed fully close opening 21 in shaft I5 to decrease 'o' vfully shut oi air feed to the working chamber-.T3515 r.of motor-1, so as to fully control of rotor Il by governor I9.-

j its outer end a connecting bushing 3| for a hosef20 oonnectionnot shown; This `air passage is ton-` trolled by a spring-pressed shut-off

valve

3,21 the? amy arranged in etushing 31 and eniiteblyes. eceupled with a trigger .38.. f trigger-ispivotal-l ly mounted in a slot 39 .handlemember Shyl yrmeansofa 'n.piv-ot pin 40 and embodies a 'camshaped inner portion 4I `arranged opposite-the.: 42, adi-@330;

push 'pin 136 andtwo operatingarms mensioned and 'arranged so that eitherarrn,

when-ininopera-tive position, is :fully extended "into slot 39 and, whendn operative, positiorng is'lgfully extendedjoutsideyof said slot seef'liigsg i Ythroughl adistrihutng 4 8 rientrally` 15 1 and 2);V The inner cam-shaped -yportion All; offlsl` trigger includes at the end-ef it s l-ifting

cam M alrecess

4,4 cooperating with'thepush pi-n control head 4, the handle membery may beremoved to `permit of ready removal of governor '19f, and :governor valve 24;., and, by unscrewing bolts 1ly connecting the cylinder section 5 Withw the front lhead 6, the fronthead may be removed nto expose the fi-'ont end of rotor Il. Removal and reassembly of the handle member of the tool is faoilitated by arrangement of a cylindrical sealingmember 1.2 which preventsleakageofn air `passing through4 .passage .302without .the use of 'a :gasket betweenthandlemember V3 and controlhead removal andreassembly of the'front fthev frontend *plate '1'3. to`frothead .6 by .a bfolt e- T4, ,so that removal of said front .head freely "ex'pses '.rotior, "l 1 for. .repair ,and eichangefmof -earl ,of the .tool .is facilitated hyfattachm'ent -of .".Ihe modiedgoverno'r and .governor valve `arrangement shown in Figs, 16' through .19 embodies $1.6slidahly mounts v.a valve .stem 8 .l i

v rangedslots l83 ein the wall ofthe bored end ,1.9 of y' 40.

arranged With-in -afborel @phtml hemel-and snallygto! theinlet passages SiV of cylinder.

g Thus,'busl'ing 48 has extended throughzitsfcentralfbere .the shaft lined is yprovided yWith two inner circular 5l and l52 alignedwith 5.50 .Shownffig lmmugh 19 coselyresem] l f the openings 21 and 2-in AshaftffiS in cornmu-y @nicationxwlith the. passage 41, Yand apassage :53

by means fof bores 5 4 an d fwhich latter-passage The. airthus'ffed t@ the @werking chamber the vmotor is; discharged from. said chamber through ioutlet passages l0 finto faf--deector chamber 56 'shaft V:It which extends :inte the frontman #60 'j vva rotorv .15,. .the .shaft 116.gifV v-whicli mounts a :govmf' valve'l slidably mounted on the bored `end 19 .coupled by. means .of a pin 82' with .sleeve valve l' 8. This pin extends throiigir oppositely ^ar,

the sha-ftandpermits shifting of the sleeve valve throughlvalvestem- 8l .by 'governors 11, Shaftfli is encircled tbye distributing ,sleeve vM commun-i- .catirrgwithgair passagesj and;86 throughbores l8T and 88.4 This sleeve includes circular recesses 83 andas! nits .in-ner wall" .effectingv communi;

HcationV between @passages 85 and B5 when Szsleeve 1- valve; 13 fiss-in its vopen' iposition rand, preventing' such-communication when .said Jsleevevalve itsclosede 'positien.; Qtherwise the `:strluclmre-,

structure previously described: -Y and' therefore further description v:t-herf'aofis lsuperilous;

, Havingft'hus described fthe ,.inventionewhat ;I ".claimissr. i

. 1.4 '1.1.1 afrotary i-foei fpnennene meter., a 'musing ave.. intereenneeten ;bers', a sa ft monntin-gsaidjrotor:having-erregend tss eeupienfwith a eme .shaft ysa .by :means era v y flfJAshaped key mem'beri V59 'lhis-drive' shaft Yis #rotatably 'mounted infront head 6 byjmearisoi a ballffbearing 60 and has its 'inner rend*shaped to 'perfss wh-ifenje seatenintnesekey-.siets and heid' f 1in rproper `position by a "split 'ring' engages thef;

.iewer ene e grinding wne'ei .as thereto,

Vfefdoo've s'aidfinlle'it passage fandfoontrolledbysaid .f "fliore .es umfv, Pvmnerees Iwere Wheel washers; msv predetermined speeds ense-lashed.;

etfeid its@ the other Qfsaidhembersend said @ndtpartiell provided .-Wbhnwial Thera@ solid valve axially s'hiftably extended into said-.hereda lateral air inlet passage for said .here iarranged;below Vsaid valve andnot controlled thereby, .a.llatg eral fair 4'outlet 4passagfe for said bore; arranged valve1 AV-a valv sleeve encirclingv the bored end of SagesJ wie @We Slel'efand Said ,valve @Operating with saidsnartinseanng the 'saidf'one chamber,

and a governoronsaid end 'of sagidfshaft jwithlnv lsaid other'fchamlber #engaging said' valve d and 2. .In a rotary power tool with a pnuematic motor, a housing having a rotor chamber and a.

governor chamber, a rotor in said rotor chamben.

valve and .not controlled thereby, a lateral air:

outlet passage for said bore `arranged above said outlet and controlled by said valve, a .bearing sleeve between said two chambers; encircling the mined speeds of said shaft.

in its inner wall communicating with said inlet and outlet passages, said bearing sleeve and said valve cooperating with said'shaft in sealing said governorl chamber from said bore in said shaft and said rotor chamber, anda governor on said end of said shaft engaging said valve andadapted Vto shift same against air pressure in said .bore

passage at predeterfor control of said outlet CHARLES F. OVERLY;

` bored end of said shaft and formed with recesses