oct. 22, 1946.` R. E. BAUERTHREAD CHECKER `Filèd Nov. 1o, 1944 . 2,409,924 Oct. 22, 1946. v « ` . - R' THREAD BAUER 2,409,924 GHEGKER Filed Nov. 10 ,_ 1,944 ¿5f 3 Sheets-Sheet 2 a errbmwsyo: ÜCÍÃ 22,. 1946.- ‘l R, E, BAUER THREAD CHECKEÈ 2,409,924 . Filed Nov. 10”( 1944' ' _ 3 Sheets-Sheet 5 INVENTÓR. )îzfáseZZZÍZîdlleß’ ' BY » H fr0/7” Era. 2,409,924 rammed oct. 22, 1946 UNITED STATES PATENT oFEicE 2,409,924 THREAD cHEoKER.Russell E. Bauer, Detroit, Mich. Application November 10, 1944, Serial No. 562,752 3 Claims. (c1. as_me) . l 2 and pointed ends which arevadapted to be re The present invention relates to thread Check~ ceived within centered recesses formed in the ing 'devices and particularly relates to such de ends of the workpiece 6 so that the workpiece 6 vices for checking the drunkenness and lead of is properly centered on the mounting member 2 threads. The primary object of the present invention is 5 with the axis of the workpiece extending parallel to the axis of raceways 3 and 4. to provide improvements in devices of the type The member 2 is generally U-shaped and has mentioned by which the drunkenness and/ or lead upwardly extending arms 9 and I0, upon which of a thread may be quickly and accurately checked. The term “drunkenness” or “drunken lead” is known and understood in the art as a thread which is staggered from a true helical thread, and while the lead may check by meas urement along one side of the threaded work piece >in a certain plane, in a plane opposite thereto or on the opposite sides of the workpiece in the same plane the thread may be off from the true helix. Other objects of the invention will become ap-- parent from the following speciñcation, the drawings relating thereto, and from the claims the centers 'l and 8 are mounted, respectively. The upper surfaces of the arms are for-med with T-slots II which receive the heads of screws I2 therein. The screws extend upwardly through the centers 'i and 3 and have thumb nuts I3 threaded to the upper ends thereof so that the centers l and 8 may be ñxed in their longitudinal positions on arms 9 and Iß. One of the centers, such as l, is hollow and has a compression spring I4 disposed therein, one end of which abuts against the inner surface of the center 1 and the 20 opposite end of which abuts against a block I5 which is also received within the hollow center l. 'I‘he shank of the screw I2 extends through the block I5 and through elongated openings I6 formed in the center l so that the center 'I may l, Figure l is a top plan view of the thread check ing and Ymeasuring device embodying features of 25 may be resiliently urged toward the workpiece. Clamping member I'I is disposed under the thumby the present invention; I screw I3 and engages the upper surface of the Fig. 2 is a view taken in the direction- of the center] so that such center may be frictionally arrow 2 of Fig. 1, with parts removed and show held in its longitudinal position. ` ing parts in cross-section thereof; A pair of oppositely disposed thread contact .. i Fig. 3 is an end elevational view taken in the » ing members I8 and I9 are mounted on the base l direction of the arrow 3 of Fig. 1 and with one of and are positioned to engage the thread of the the centering means removed; workpiece on opposite sides thereof. The mem Fig. 4 is a cross-sectional View taken substan bers I 8 and I9 have pointed ends which engage in tially along the line 4_4 of Fig. 1; and the thread. The contact member I8 is mounted Fig. 5 is a fragmentary end view taken from hereinafter set forth. In the drawings, in which like numerals desig nate like parts in the several views throughout: the left end of Fig. 2. . on an upstanding bracket 29 which may be fixed to one side of the base I. The member I8 is re Referring to the drawings, the thread measur ceived through an aperture 2l formed in the ing and checking device comprises a base I hav member 20 and may be adjustably ñxed therein ing a workpiece carrying and supporting member 2 mounted thereon. The supporting member 2 40 by means of a setscrew 22. The member I9 is relatively long and is mov-` is Vmounted for longitudinal translation and ably mounted on the top surface of a carrier or transverse tilting movement with respect to the slide 23. The slide 23 is mounted for movement base. In `order to so mount the member 2 the along the top surface of another slide 24. The upper surface of the base is formed with a longi tudinally extending raceway 3, which is generally 45 slide 24 is mounted for longitudinal movement `along the base I. The upper surface of base I -V-shaped in section. The underside of member is formed with trackways 25, which slidably sup 2 is also formed with a longitudinally extending port the carriage 24 thereon for movement par raceway 4 which is also V-shaped and which is allel to raceway 3. Carriage 23 may be fixed in positioned to face the raceway 3. Ball bearings 5 are disposed in the raceways 3 and 4 in spaced 50 any of its longitudinal positions by means of a bolt 26 having a laterally offset head 2T which is ‘relation so that the member 2 may roll longi received within a longitudinally extending angu tudinally of the raceway 3 and may tilt trans lar recess 28. The bolt 26 extends through the versely thereof in either direction. Suitable carriage 24 andthe threaded upper end thereof is stops may be provided on the raceways to limit the movement of the b-alls and to retain them in 55 threadably received within the threaded shank of a thumb nut 29. By tightening the thumbnut it ` properly spaced relation. will be seen that the adjacent surfaces of the A workpiece 6, which is a screw-threaded ele head 21 and recess 28 are pulled together so that ment, is supported on the member 2 and is cen the carriage 24 is ñxed in position. tered thereon by means of a pair of facing cen ters A‘Il andi.` The _centers 'I and 8 have facing 60 The carriage 23 is slidably mounted on the top 2,409,924 3 fi surface of carriage 24 for movement toward and then moved so that the face of a stop 5| mounted ,thereon abuts against the projection of the stop 56. The stop 59 is held in adjusted position by a clamp 5d which has a V-groove on the undersur face thereof engageable with the top surface of stop 59. The clamp 54 is mounted on the base | from the axis of the workpiece, or in a direction transverse to the direction of movement of car riage 24. To somount the carriage 23 the upper surfacerof carriage ‘24 is formed `with trackways 39 upon which the undersurface of carriage 23 slides. A recess 3 |, similar to recess 28, is formed in the top surface of member 24 and receives the offset head 32 of a screw 33 which- extends up wardly through carriage 23 at an angle. A thumb nut 34 is threaded to the threaded end of screw 33, and the carriage 23 may lbe vadjusted’ along the length of recess 3| with respect to> car riage 24. The contact member I9, which is in the form of an elongated rod, is mounted on the top? surface of lcarriage 23 for pivotal movement about its end by means of a screw 55. The carriage 2 is then positioned so that the thread is engaged by the pointed end of contact I9. The rim of the dial may lthen be turned so that the pointer is at zero. If it is then desired to check the lead for a par ticular length therealong a gage block 52 of that - particular dimension is disposed betweenl the faces of stops 50 and 5| with such faces engaging the opposite ends of the gage block. The thread is then brought into engagement with Contact |9, Aand any variation in the lead will then be yindi indicated at 35. Suchend 35 has a center recess ' cated by a deflection of the pointer | 9 which will formed therein into which the pointed end of a depress plunger 4| to move the pointer of the centering screw is received. The centering screw 20, dial indicator itil. ' 36 may be threaded into a tapped opening in an Formal changes may be made inthe specific upwardly projecting end 31 of the carriage A23. >embodiment of the invention described without The Contact member I9 is supported above the departing from the-invention, lthe scope of which top surface of the carriage 23 by means of a sup is commensurate with the‘appended claims. porting member 38 which is slidably received on What is claimed is: the top surface of carriage 23. The member 38 l. A device for measuring and checking >may be moved along the contact I9 to its proper threaded workpieces comprising a base, a work position and may be fixed in position by means of piece supporting member, center mounting mem a setscrew which extends through the top thereof bers on said supporting member and adapted to and engages the contact |9. The lateral move 30 mount a centered workpiece therebetween, means ment of the contact I9 is limited by upwardly mounting said supporting member on said base projecting stop pins’ßû and 6 |V which are mounted for movement along and tilting movement trans on the top surface of slide 23 adjacent the pointed versely to the longitudinal axis of said workpiece, said last-named means including facing race end of contact I9. A conventional dial indicator iiD, having the conventional plunger 4|, is mounted on carriage lways formed on-said supporting> member and said base with ball members interposed there 23 by means of a rigid bracket 42. On end of the between, thread contact means mounted on said ' bracket 42 is fixed ,to the carriage 23, and the base and positioned to engage the thread of the opposite end is ñxed to a depending lugllíi which workpiece, said contact means including an ele may be fixed to the dial indicator casing. As 40 ment having an end positioned to engage said mentioned, the dial indicator 'lill is of conventional .'thread, means movably mounting said element, construction and has the conventional pointer and indicator means mounted on said base actu which is actuated through a spring ratchet by ated lby movement of said element. the Aplunger 4 |. 2. A device `for measuring and checking The plunger M'bears against the adjacent side threaded workpieces comprising a base, a work of contact I 9. Contact I9 is resiliently urged into piece supporting member, center mounting'mem contact with Vthe plunger 4| by means of a coil bers on said supporting member and adapted to spring 45. One end of `the coil spring 45 iscon mount a centered workpiece therebetween, »means nected toa pin 46 which in turn is fixed to the mounting said supporting member on saidbase projection 3l; andthe opposite end of the spring for movement along and tilting movement‘trans '115 is ‘fixed to a pin 41 which is ñxed to the collar versely to the longitudinal axis of said workpiece, 3.8. a pair of oppositely disposed thread contact mem To check the drunkenness of the thread of a bers mounted on said base and positioned to en workpiece B, the device is set up so> that contacts gage the'thread of the workpiece, means movably i8 and I9 engage in the thread on opposite sides mounting one of said contactmembers, and indi thereof. The base | is preferably _tilted by plac cator means _mounted on said base and actuated“ ing ,a shim under the right~hand end `(viewing `by movement of said one of said contact members. Fig.' 2) , so that the carriage or supporting member 3. »A ,device for Y -measuring and checking 2 .tendsto roll 'toward the lef-t. This insures the threads will bear against the points at all times 60 threaded workpieces comprising a base, a work piece supporting member, center mounting mem during the operation. By then rotating the work bers on saidsupporting member and adapted to piece 5 so that the carriage 2 runs along its race kmou-nt a centered workpiece therebetween, means ways any deviation in the thread from the true mounting said supporting member on said base helix will .eiîect a lateral displacement of contactfor movement along andV tiltingmovement trans i9. The deflection of contact "I9 will cause versely -to- the longitudinal axis of said workpiece, plunger ¿il to move and indicate >the extent of said last-named means including facing race deflection on the dial indicator 49. . To check the lead of the thread, the contact it `is removed and the workpiece is positioned .against .contact |19 .so that itleans thereagainst. .A stop 5|] in _the form .of a`bar of the same diame ter as _the balls V5is .mounted in the trackway .3 for adjustment therealong adjacent one end of theraceway .3. .'I'he stopy 5D,_has a diametric pro ‘jection 53 along one end, and the carriage'2 is 75 ways formedy on said supporting member and said base with ballfmembersinterposed therebetween, a pair of oppositely disposed threadcontact mem bers mounted on said base and positioned to en gage the thread of the workpiece, means movably mounting one of said contact members, ,and in dicator means ,mounted on said base and actuated by movement of said one of said contact‘members. ' RUSSELL E. BAUER.