Патент USA US2406326код для вставки
Aug- 27, l946~ - , ' H. ‘.1. ENGBRECHT A‘I'ooL ` .2,406,326 I Filed Jan. 19, '1944 IN VEN TOR. Patented Aug. 27, 1946 2,406,326 UNITED STATES PATENT OFFICE . TOOL Herman J. Engbrecht, North Hollywood, Calif., as signor to Bendix Aviation Corporation, North Hollywood, Calif., a corporation of California Application January 19, 1944, Serial No. 518,839 5 Claims. (Cl. 90-12.5) 2 l This invention relates to tools for accurately cutting or finishing surfaces in valves and the like ' and is particularly usefu1 for reaming a surface in concentric relation with another surface or surfaces. An object of the invention is to facilitate the rapid and accurate cutting of a surface in con centric relation to another surface. l A more speciñc object is to provide a tool for cutting seats in valve bodies and the like which tool positively aligns theÁ seat in true concentric relation with the passage or passages leading to the seat. » ' Other more speciñc objects and features of the invention will appear from the detailed descrip tion to follow. , It is common in the construction of hydraulic valves >to employ two aligned bores of different Fig. 4 is a side view, part in elevation and part in longitudinal section of the collet. Referring rlrst to Fig. 1, there is shown, in broken lines, a valve body III having a small bore II merging into a larger bore I2, which extends to the outer end of a tubular body portion I3, which is externally threaded as indicated at I4. As these bodies are received for finishing, the small bore II is approximately aligned with the bore I2, which in turn is at least approximately aligned with the external threads I4. To finish the body, the smallbore II must have a conical seat cut therein at its outer end, which conical seat should be in alignment with both the axis of the large bore and the axis of the threads I4, if the bore and the threads are in perfect axial alignment. If the bore and threads are not in perfect alignment with each other, the axis of the seat should be midway between the axes of the smaller bore where it merges into the larger 20 the bore and the threads respectively. Further more, if the small bore II was not originally in bore. Heretofore, it has been the practice to accurate alignment with the large bore I2, and ream the conical seat and/or the smaller bore external thread I E, it must be reamed to place it ‘ with a reaming tool admitted through the larger in alignment. bore. However, the prior methods did not pro In the particular valve body IIJ shown in the` vide any positive means for aligning the tool with diameter with a conical valve seat in the end of the larger bore, the skill of the workman being relied upon to so support the reaming too1 that the Vresultant reamed surface would be reason drawing, the left end portion of the large bore I2 is of slightly smaller diameter than the re mainder, but this is of no particular moment in sofar as the present invention is concerned. ably accurately aligned with the larger bore. These previous methods have been unsatisfactory, 30 l A too1 in accordance with the present invention for cutting a conical seat in the right end of bore not only because they required a considerable II is shown in full lines in Fig. 1. It comprises amount of skill on the part of the workman, but a hollow body member I5 internally threaded at were slow, and, where accurate work was de one end with threads I6 that are dimensioned to manded, there were considerable numbers of re jections even with eflicient workmen. 35 rather loosely engage the threads I4 on the valve f body Ill. Adjustably fitted in a smooth bore in In accordance with the present invention, I the outer end of member I 5 is a sleeve I'I, the left eliminate the need of specially skilled workmen for performing this operation by providing a seat end of which is chamfered or beveled to form a conical surface ñtting against the beveled inte reaming tool which has a guide structure expand able to wedge in the larger bore so that there 40 rior end of an expansible collet I8, >which is adapted to be expanded against the large bore , is no possibility of the reaming too1 being mis I2 of the valve body Ill. To this end, there is ac aligned, even by unskilled workmen. I further provide for the rapid assembly of the reaming curately fitted within the sleeve I'I a tubular guide I 9, which extends through the expansible collet tool in the valve to be reamed, by utilizing the usual threads on the valve body for expanding the 45 I8 and is enlarged at its left end to ñt loosely guide in the larger bore. within the reduced end portion of the large bore I2. At the point of enlargement, the guide I9 is A full understanding of the invention may be smoothly tapered to provide a, flared or conical had from the following detailed description'with ` `seat 20, which cooperates with the <seat 2 I on the reference to the drawing, in which: Fig. l is a view part in side elevation and part 50 sleeve I'I to expand the collet I8 when the tool is in section of a tool in accordance withthe in vention for reaming a conical seat in a valve body, the tool being adapted for a valve body with ex set. ternal screw threads. the conical seat at the right end of the small bore II. A handle 40 may be provided onthe outer end of the stem 22 to facilitate its actuation manually, although it is to be understood that, if desired, the stem 22 can be gripped by the chuck of a drill or the like for its actuation. In order y Fig. '2,is a view part in side elevation and part in section of a tool in accordance with the inven tion for reaming a straight bore in a valve vbody having internal screw threads. Fig. ‘3 is an end view of a collet employed in the tool, andl ‘ A , The guide I!! rotatably supports the stem 22 of a conical reamer 23 which is rotated to ream 60 to prevent injury to the conical 'seat cut by the 2,406,326 3 4 reamer as a result of accidental impact of the reamer against the seat while the reamer is not cause the seat will vary in width at different cir cumferential points. being turned; it is desirable to .providea helical;y conicalï'seat has been formed, asgdescribed with spring 24 >which’.iscompressed between a stoplâi. reference toFig. 1, inspection of the seat shows Therefore, if, after the. that the small bore is out of alignment Ywith the secured to the stem 22 and the inner end of a counter bore 2% in the right endfof the guide ISLJÍÍ. l >large bore, correction is made by applying the .tool as previously described, but with a straight This spring 2d retracts the reamer head 23 away from the seat as soon as the actuating handle 49” " " reamer 35 of suitable size substituted for the coni The cylindrical reamer ~ ' ' " `VVcal reamer'23 of Fig._1. is released. The device is actuated as follows‘zv; É‘irstg. thee" 10 isthen: a‘dvancedrinto the bore IIa for a short sleeve I'I is properly positioned..longitudinally" ` distance. to form acounter bore that is in perfect within the tool body I5 and locked into. position. . alignment with the conical seat and with the by tightening set screws 2l in the body I5." Then ' large b'ore. Although for the purposes of explaining the invention a specific embodiment thereof has been described indetail withv reference to the drawing, it is to be understoodthat the invention isnot. the tool is attached to the valve body I 0 by enten` . ing the inner end of the guide IS into the large bore I 2 and screwing. the tool body I5 on tothe external threads I4` of the valve body-I0. 'This ñrst moves the entire tool to the leftv until ythe left end 280i the guide I9 `rests against the shoul- i der. at they left end, of the large bore „lzgwhich 20 limitedto exact structuresv described but. only-to. the extent .setforthin- the appended claims. I claim: ` Y . l. A tool fcrmachininga body having a-.cylin stops further movement to the left of the guide. I 9. ` Thereafter, as Vthe tool'body IS-is given itsiinal ' drical bore and screw threads inv at leastapproxi turns, the sleeve Il is `moved to the left relative mately concentric relation'tov saidbore, to .produce in said. body a surface yoirevolution in ,approxi tothe guide. I9, causing the. conical surfacesZI . and 20, on the sleeve Il and the guide I9 respec-; 25 mate axialalignment with said bore', said toolv tively, to expand the collet Iß'tightly againstthe., large bore I2. .As clearly shown in.Figs.I3 and..4,-` the colletIB hasfour slits Sil-.extending ¿from the., right end approximately three quarters v.of the way to the left end,. and‘four slits .3l extending from. 30 comprising: Va'nollow guidedimensioned to enter said. bore; a rotatable.v tool accurately guided .by said guide for rotary and longitudinal movement coaxial with said. guide; andmeans for positively positioning said guide withinsaid bore, compris. ing an expansible annular member» surrounding` said guide and an annular wedgeßmember aligned with and relatively axially moveable with respect to said guide, at leastfone of said.. members .hav the left . endapproximatelythree quartersof .the 1 wayto theright end, the slits .3| being circumfer- y entially positioned midway between adjacent .slits 30. The colletis therefore free. toexpand, .in re-‘v sponse to the wedging action'applied thereto by'. 35 ing. a conical surface .cooperativewith the other member to expand said expansible annular mem the conical surfacesZII and 2 i, until its outer sur- ` face is expanded. tightly against the., bore'. I2,..v ber against said. borein responseto relative axial which occurs when thetool body I5 has been. fully` tightened. ,. As _hasbeen previously , « . movement cf-.said-members towardeach other, and means vfor e?iecting. said relative. axial move-y ment including. means forlimiting» axial. move. , mentioned, thethreads do I6 inthe tool body I5 .are cut to ñt loosely on the ment of said expansiblemember into said bore, threads » I 4 of the .valve body, so that, if the threads: and nut means adaptedfto engage thethreadsof I4.are not Aexactlycoaxial'withy the large bore ~.I2,. the toolbody I5 can cock .slightly with respect to.threads.-I“I,.i'lo` permit the guide I9 to. assume av position .in which its axisis intermediatethe. axis said body, for moving said wedge member-'againstl said expansible member. 45 of the bore. I2 andthe threads Iiìrespectively. » . ~ . . ` 2. A tool asdescribedin claim 1 forreamingY a Ybody havingexternal threads surrounding saidv bore, in which said nut .means comprises a. skirt After the toolhasbeen positioned as described', adaptedv to .telescope over the» threaded portion the conical seat is reamed at the right end of the of said .body member Yand havinginternal threads small, bore AII by pressing the handleßo to the left. 50 to engage therewith. and rotatingit. . . - . . ~ . » . ' n .f SpA-tool as. described in claim 1 for reaming- a ~ The stop 25,. in, addition to .functioningas a: collar for the compression of the` spring 24„also bore. is internally threaded, in. which said nut _ functions as a stop to limit the depthof out made meanscomprises an annularv member dimensioned body in> which the.. outer end .portion of said large by the conical reaxner 23. Thus, the stop.25 may 55 tov enter saidlarge bore and externally threaded` ` .besecured to the stem 22 of the reamer by an to engage with .said .threads in .the body. Allenset screw 32, and by loosening .this screw, . 4». .A -tool as described in claim 1 in which said the stop 25 vcan be so positioned cnthe stem.22 expansible annulanmember- has .two expansible aste contact the outer end 33 of the guide I9` annular, bore-contacting faces at-opposite ends when the reamer has lcut to the desired depth. `60.. thereof, and.. cooperating. faces on oneend of` said Referring noW toFig. 2, there is shown a tool annular member and said guide, and-.cooperating substantially identical with thatdescribed with faces on the `other end of saidv annular. member reference to. Figs. 1, 3 Vand 4 except. that thebo'dy.` and. said wedge member, whereby both'ends of I5 is> provided with external threads 34 to iît -in-. said annularmember are. expanded against ,saidv 'ternal threads 35. in another branch of the valvei 65, bore in. response to thelongitudinal movement of said wedge. member produced by tightening ,said . body I0, and a straight reamer 35 is substituted. for the conical reamer 23 ofFig. l. It may be as- » nut means. sumed that in Fig. 2 aconical seat 31 has'already been reamed at the lower end of the passage IIa by employing in the tool of Fig. 2 a conical-reamer ' similar 4to reamer .23. lof Fig. l, and that tit has . . ` , 5. At'oolas-described in claim 1 ill-which said nut means has a cylindrical bearing surface 7.0 closely fitted.. onfV a cylindricaLbearing 'surface' on said guide whereby said nut means and said been discovered, after the> formation» ofthe seat' 31,1 that ‘the bore._I Ia is out of alignment ywith the bore `I2a. Such misalignment can beV readily de-` guide aremaintained in alinement with-each tectedafter. the conical seaizh'asbeenV cut, be 75 ' other, irrespective of.misalinement between' the bore and the threads of the body to` bemachined. . HERMAN J. ENGBRECHT.