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` Dec. 17, 1946. _A.` M. DRAKE 2,412,721 ADJUSTING DEVICE FOR LAPPING TOÓLS Filed NOV. 18, 1944 :s sheets-sheet'l INVENTOR. ` Dec. l?, E946.' A. M. BRAKE ZAHZÄEÈ ADJUSTING DEVICE FOR LAPPING >TOOLS ` Filed Nov. 18, 1944 3 SheetsjSheet 2 fig@ / . BY /K Dec. 17, 1946. 'A_ M, DRAKE 2,412,721 ' " ADJUSTING DEVICE FOR LAPPING TOOLS Filed Nov. 1-8, 1944 ' 3 Sheets-Sheet 3 bvmm, ___„QM il lvIid_u nwmu lHn| Y INVENT0R. Mß/wî'e Patented Dec. 17, 1946 2,412,721 UNITED STATES PATENT OFFICE 2,412,721 ADJU STIN G DEVICE FOR LAPPING TOOLS Alden M. Drake, West Hartford, Conn., assignor to Niles-Bement-Pond Company, West Hart ford, Conn., a corporation of New Jersey Application November 18, 1944, Serial No. 564,155 6 Claims. (Cl. 51-184.3} 2 This invention relates to lapping machines arbor showing one of the impact members in and particularly to a machine for lapping in retracted position. ternal cylindrical surfaces to precision dimen Fig. 5 is a cross sectional view of the arbor sions. and lap taken on the plane of line 5-5 of Fig. 4. An object of the invention is to provide im Fig. G is a longitudinal view partly in section of proved lap adjusting means in a machine for 5 another iorm of impact means. automatically actuating a work piece being Fig. ’7 is an end elevation of the impact means lapped over the surface of a lapping tool which shown in Fig. 6. may be rotated simultaneously with reciproca Fig. 8 is a longitudinal sectional view of a part tions of the work piece. 10 oi the mechanism shown in Fig. 6, the section Primarily it is an object of the present inven beingtaken on the plane of line 8_8 in Fig. 6. tion to provide impact means manually applied Fig. 9 is a horizontal sectional View of parts under controllable conditions to slightly vary the shown in Fig. 6, the section being taken on the effective diameter of the lapping tool during the plane of line 9-3 in Fig. 6. lapping operation. ` A feature of importance is that the impact 15 Fig. 1G is a sectional View of of a. part of the impact mechanism for reducing the size of the lapping member, the section being taken on the plane of line lll-lli in Fig. 7, and means are operative in one direction to increase the effective diameter of the lapping surface and in the opposite direction to decrease the effective Fig. l1 is a sectional view of parts shown in Fig. diameter. 20 7, the section `being taken on the plane of line Another feature of advantage is that the two ií~--íl in Fig. 10. impact means are independently actuated and may be adjusted individually over wide ranges, In the above mentioned drawings there have been shown two embodiments of the invention so that but one or both impact means may be `enflployed to any extent that may be necessary to make the desired adjustment. With the above and other objects in view the invention includes the features of construction and operation set forth in the following spec ification and illustrated in the accompanying drawings. In the accompanying drawings annexed here to and forming a part of this specification, I have shown the invention embodied in a hole lapping machine for rolls of small size used in dimension gages but it will be understood that the invention can be otherwise embodied and that the drawings are not to be construed as defining or limiting the scope of the invention, the claims appended to this speciñcation being relied upon for that purpose. In the drawings: Figure 1 is a vertical sectional view taken‘longi tudinally through the principal parts of a ma chine embodying one form of the present in vention. Fig. 2 is a longitudinal sectional view in eleva tion showing one form of impact means for forc ing a lap axially along its arbor to slightly vin crease the size of the lapping surface during the lapping operation. Fig. 3 is a detail view of parts shown in Fig. 2 taken from below. Fig, ‘iis _a longitudinal view of _a lap on its which are now deemed preferable, but it is to be understood that changes and modifications may be made within >the scope of the appended claims without departing from the spirit of the inven tion. In lapping rotatably mounted members for gages it is essential that the holes by means of which they are mounted ‘ce of uniform diameter from end to end and without bell-mounting. The rolls must fit their arbors closely and evenly from end to end so that they will not tilt during use but will rotate smoothly on their arbors about a ñXed axis. lieretofore precision lapping of in ternal cylindrical surfaces has, for the most part, Abeen done manually, the work piece being held v manually in position upon a rotating lappingA tool on a suitabie spindle and slowly reciprocated back and forth during rotation of the spindle vand lapping tool. The lap usually comprised a split cast iron sleeve charged with abrasive and 45 fitting tightly but resiliently over a slightly ta pered arbor secured to the spindle. To expand the lapping surface the sleeve having the lap ping surface was forced axially along the ta ered arbor. 50 _ The present invention relates particularly to impact `means for forcing the expansible lap pre determined slieht amounts axially during the lapping operation to slightly increase its diam eter, other impact means also being provided to move the lapping tool in the opposite direction 2,412,721 on its arbor to reduce slightly its lapping diam eter. ` Briefly, and in its preferred aspect, the inven tion may include the following principal parts: First, a spindle adapted to be rotated by any 4 22 may, therefore, by rotation, be accurately ad justed so that when forced forward it will strike the lap 29. Also, by disengaging the detent 25, the plunger 22 may be quickly moved any dis tance in either direction. The forward or strik ing end of this plunger 22 may be provided with appropriate means and having means at its for an adapter 29 rotatable within the plunger 22 ward end to mount an arbor extending axially and recessed to ñt over the end of the lapping from the spindle; second, a, plunger aligned with arbor I9 and directly engage the front face of the lapping spindle and adapted to be resiliently the sleeve 23 forming the lap. retracted and released for forward movement to 10 In order to control the force of the blow ei» strike the end of the lapping tool so that the fected by this >plunger 22, means are provided position of the lapping tool on its spindle may to adjust the pressure of the helical spring 24. be adjusted axially to slightly increase its diame As will be seen in Fig. 2, the helical spring is ter; and third, a second plunger mounted for housed in the bracket 2l within a suitablev recess. rapid forward movement and adapted to engage The forward end of the spring 24 bears against a member bearing against the opposite end of the head of a bolt 2l extending thro-ugh the the lapping tool and move it axially to slightly bracket 2l and through a portion of the retracti decrease its diameter. ble member 23. The outer end of this bolt 21 is Referring more in detail to rthe figures of the threaded and is engaged by a suitable manual drawings and first to Fig. l, I provide a spindle I0 20 adjusting nut 2S. By rotation of this nut 28 the adapted to be driven by a bevel gear I I on a‘short pressure of the helical spring 24 forcing the re shaft I2 in alinement with the spindle I9 and tractible member 23 toward its forward position which in turn may be driven through any suit may be widely varied.V In order to effect the de able connections such as a driving bevel gear I3 livery of the blow by plunger r22 against the end, 25 connected by means no-t shown to a suitable face of `lap 23` a hand lever 29 is provided having source of power. 'At the forward end of the spin a projection `or latch 30 adapted to engage a de dle is an arbor I9 extending axially therefrom pending pontion of the retractible member 23 so and preferably detachably mounted thereon. that by oscillation of this handle 29 the projec Above the spindle Ill is a reciprocated mem tion will be disengaged from the depending por ber I4 on which is mounted a work holder SI 30 tion of the retractible member 23 after a prede within which the work piece being lapped is termined retractive movement. This will release mounted for reciprocatory movement along the the retractible member 23 for forward move arbor I9 during the lapping operation. ment under the adjusted pressure of the helical The above members are or may be similar in every way to corresponding members in my co pending application Serial No. 520,257, filed Jan Yuary 29, 1944, of which the present application spring ‘24. To adjust the plunger 22 so that it will Contact the end face of ‘the lapping tool and advance this tool a predetermined distance when released, it is only necessary to rotate the plunger is »a continuation in part. 22 within the retractible member 23. The lapping member 29 may be similar to the Figs. 6 to 11 show another form of impact member shown in «the above referred to appli 40 means for action upon the lapping member 20 cation and formed of cas-t iron or other metal to move it axially along its arbor in either direc slotted longitudinally throughout its length and tion to increase or decrease the effective diame bored to fit a slight :tapered portion of the ar ter of its lapping surface. bor I9. In the mechanism shown in Fig. 6 et seq. for In order to adjust the position of the lapping advancing the lap 2i) in a direction to increase member or sleeve 2l) upon its arbor I9 to vary its effective diameter, a construction veryV similar its effective diameter as required during the lap to that shown in Fig. 2 is employed. This ping operation, impact means are provided which mechanism has a retractible‘plunger 32 which may be actuated manually todeliver a carefully may be adjusted axially toward or from the regulated blow upon an end face of the split , lapping tool 29 by means of a threaded portion sleeve forming the lapping tool 29 to» force this thereon and the impact may be adjusted by a member axially on its arbor I9 a slight but pre helical spring 34 adjusted by a manually rotat determined distance depending upon the force able nut 35. The blow may be delivered by de of the blow; Figs. 1, 2 and 3 show one form of impact mechanism acting in one direction only to increase the diameter of the lapping surface of the lapping tool. To effect this impact ad justmenlt of the lap 29, a bracket ZI is mounted upon the base of the machine having a plunger 22 therein disposed accurately in alinement with the spindle Iii and arbor I9. This plunger 22 is mounted within the retractible member within ‘the bracket 2l and is normally forced toward the pressing a plunger 36 to release a latch 31 from a member 39 within which the plunger 32 is 60 ¿ mounted attached to the plunger 32‘ to force the plunger toward the lap. The above described mechanism is mounted on a fixed .bracket 38 and will~be clear by an examination of Figs. 6, 7 and 8. In order to deliver a blow in a direction to move the lapping tool 2i) along its arbor I9 in a direction to reduce its effective diameter, the retracting this member 23 compresses the spring 65 following, mechanism is employed. Withinthe bracket 38 supporting the plunger 32 for in 24, then, upon. release of the member 23 the creasing the diameter of the .lap is a second plunger22 will be yforced forwardly and _its end plunger 40 which may be retracted manually Y» face will be brought into contact with and force against the pressure of a coil spring 4I and~ re the lapping rtool 20 axially along its arbor I9. leased by simply releasing the handle. The pres~ To adjust the axial position of the plunger 22 sure effected by the spring ¿I may be regulated so that its end face will strike the end of lap by a threaded nut 52, rotation of which varies ping sleeve 29, the plunger 22 may be threaded the ‘compression ofthe spring 4l to any prede -throughout the major portion of its length, the termined degree. The inner or active end _of threads of which engage a retractible detent 25 the plunger 4l) is' within -striking distance of an mounted within the bracket 2|. The plunger lapping spindle by a helical spring 2d. Manually 2,412,721 arm 43 pivoted substantially at its central posi tion on a horizontal axis 44 so that it may swing in a vertical plane. The plunger 40 strikes the lower end of this vertical pivotal arm 43'. and at its upper end is provided with a member 45 adapted to strike against an abutment member 46 engaging against the inner end face of the sleeve 20 forming the lapping tool. A spring 41, as shown in Figs. '7, 10 and 11, serves to retain the arm 43 in its vertical striking position and a pendulum 48 supported within a horizontal bearing in the bracket 38 at the upper portion of the arm 43 serves to hold in vertical position the head 45 engageable against the striking mem» ber 46 when the arm 43 is oscillated by the 15 plunger 40. What I claim is: 1. An adjusting device for lapping tools of the expansible sleeve type, said device comprising a striking plunger mounted in alinement with 20 said sleeve and movable into contact with an end face of said sleeve while mounted on its spindle, means normally forcing said plunger in one direction, retracting means for said plunger, and means to release said plunger from a retracted position, whereby said plunger may strike and force said sleeve axially on its spindle. 2. An adjusting device for lapping tools oi the expansible sleeve type, said device comprising a striking plunger mounted in alinement with said sleeve and movable into contact with an end face of said sleeve while mounted on its spindle, means normally forcing said plunger in one di rection, retracting means for said plunger, and whereby said plunger may strike and'i'orce said sleeve axially on its spindle. \ 4. An adjusting device for lapping tools of the expansible sleeve type, said device comprising a striking plunger mounted in alinement with said sleeve and movable into contact with an end face of said sleeve while mounted on its; spindle, means normally Aforcing said plunger in one di rection, retracting means for said plunger, means to adjust the plunger axially relative to its re tracting means, and means to release said re~ tracting means from a predetermined .retracted position whereby said plunger may strike and force said sleeve axially on its spindle. 5. An adjusting device for lapping tools of the expansible sleeve type, said device comprising a striking plunger mounted in alinement with said sleeve and movable into contact with. an end face of said sleeve while mounted on its spindle, and a second plunger mounted parallelly to said ñrst plunger to actuate a pivotal arm into posi tion to strike the sleeve at its opposite end, means normally forcing said plungers in one direction, separate retracting means for said plungers, and means to individually release said retracting means from predetermined retracted positions whereby said plungers may Aforce said sleeve axially on its spindle in either direction. 6. An adjusting device for lapping tools of the expansible sleeve type, Said device comprising parallel striking plungers, one of which is mount» ed in alinement with said sleeve and movable respectively into contact with an end face of said sleeve while mounted on its spindle, means means to release said retracting means from a 35 normally forcing said plungers in one direction, predetermined retracted position, whereby said individual retracting means for said plungers. plunger may strike a regulatable blowv and force and means to release one of said retracting said sleeve axially on its spindle. means from a retracted position whereby its 3. An adjusting device for lapping tools of the plunger may strike and force said sleeve axially expansible sleeve type, said device comprising a 40 on its spindle in a direction to enlarge the di striking plunger mounted in alinement with said ameter of said sleeve, and means to release the sleeve and movable into contact with an end other of said retracting means from a retracted face of said sleeve while mounted on its spindle, position and force its plunger in a direction to means normally forcing said plunger toward its engage a striker and oscillate said striker against striking position, retracting means for said the opposite end of said sleeve. plunger, and means to release said retracting 45 means from a predetermined retracted position ALDEN M. BRAKE.