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Nov. 19, .1946. > A. RAPPL 2,411,292 GAUGE Filed April 21, 1945 2 Sheets-Sheet l INVENTOR . 4/2/10? @A/J/J/ 62m, (3W2, @2229, am. ATT RNEYS Nov. 19, 1946. A. RAPPL 2,411,292 GAUGE Filed April 21, 1945 2 Sheets-Sheet 2 1/1; " F/& .6'. INVENTOR 4/2/30 RAP/J1 NEYS Paten'ted Nov. 19, ‘1946' 2,411,292 UNITED.‘ STATES PATENT OFFICE‘ \ 2,411,292 GAUGE Anton Rappl, Eggertsville, N. Y., assignor to Trico Products Corporation, Buffalo, N. Y. Application April 21, 1943, Serial No. 483,878 7 Claims. 1 This invention relates to a gauge or instrument for determining the dimension of objects, and primarily functions in the capacity of a com parator for testing or comparing the bores or recesses in workpieces with their counterparts in a master piece. Internal callipers usually comprise an adjust‘ ment which is slow and unsuitable for mass pro (Cl. 33-178) 2 spring 13 which, when free, moves the table to its uppermost position. To determine this posi tion a stop It is provided on a tablecarried rod l5 which is slidable through an abutment Hi. The depression of the table is limited by a stop I‘! on the rod above the abutment. Both stops are adjustably secured by set screws It to vary the uppermost position, and the. extent of free movement, of the table, and each stop is provided The object of the present invention is to pro 10 With a spring cushioning disk l9 free on the rod. vide an e?icient comparator of this type which The table may be ?xed by a set screw 2d engaged is practical and suitable for handling 1 large with the shaft l2. quantities of workpieces in an expeditious though The table is provided With a slot 2! through‘ accurate manner. which extend the upwardly directed calliper The invention further has for its object to pro ?ngers 22 and 23. One ?nger 22 is removably vide an internal gauging instrument of this char secured by a nut 24 to a gauging carriage 25 acter in which the work engaging calliper por while the companion ?nger 23 is adjustably ?xed tions are. disposed for the ready placement of the to a mounting slide 26. This slide is arranged workpiece thereover, the instrumental construc tion and arrangement of parts being such as to 20 within a slot 25' of the standard 9 for sliding ad-l justment effected by an adjusting screw 21, the reduce the number of operations to a minimum latter being threaded through the slide 26 and for measuring or testing a workpiece, thereby journaled in the standard 9 for being turned by facilitating the handling of workpieces in quan the knob 23. Upon rotating the knob the slide tity. will be advanced or retracted and accordingly Referring more particularly to the drawings: vary the adjustment of the ?xed calliper ?nger Fig. 1 is a plan view of the gauging or com 23 in the table slot 2%. By tightening the set parator instrument with portions thereof shown screw 2'!’ against the adjusting screw 27 the inhorizontal section and'other portions broken position of the latter maybe ?xed. away; i The carriage 25 is supported at its opposite Fig. 2 is a side or front elevation of the instru 30 ends by a pair of parallel links which may be in ment embodying the present invention; the form of flat springs 29, the links having their Fig. 3 is a top plan view of the work engaging lower ends ?xed to the standard 9 by screws 3i‘! part of the instrument. and their upper ends secured to the carriage by Fig. 4 is an end view of such work engaging screws 31. This mounting provides a support part; and, for the movable or ?oating calliper ?nger 22 Fig. 5 is a‘ transverse vertical sectional view practically free from friction and yet movable taken about on line 5-45 of Fig. 3. in a substantially horizontal plane. The for duction methods of present day factory practice. Referring more particularly to the drawings, the numeral l designates the base of the instru ward one of the spring links 29 is formed with an aperture 29' to permit the plunger 3 passing ment on which is mounted a micrometer mech— therethrough into direct contact with the car anism 2 having an actuator in the form of a 40 riage. The movable calliper ?nger may be given plunger 3 operable through a motion amplifying leverage generally indicated at 4 to impress the limited adjustment on it's ?oating support by means of a slot 32 in the carriage, the latter be ing urged against the plunger 3, or an adjust closing casing l’. Plus and minus tolerance in 45 able extension 33 thereof, by a spring 34 which is anchored at one end on the standard carried dicators B may be associated with the pointer 5 pin 35 while its opposite end is engaged over a in the window for the comparative testing of pin 36 on the carriage. This spring tends to workpieces with respect to a master piece, such ward separating the calliper ?ngers, moving them micrometer mechanism forming the subject mat to their work engaging position. ter of an earlier patent, N 0. 2,362,283. ‘ dimensional characteristic on a pointer 5 show ing through a window 6 of the mechanism en The base I is provided with an upright stand ard 9 having a well H3. A work squaring table Normally, however, the calliper fingers are held, in contracted relation for the ready placement‘ of a workpiece thereover, and this normal rela tionship is effected by a coiled spring 31 acting II ‘has a depending shaft I2 guidingly ?tting withinv the well and is yieldably supported by a 55 on the short arm of a retractor' lever 38 to coun 2,411,292 3 teract the action of the spring 34 on the carriage 25. The short arm has a lateral lug 39 normally engaging a shoulder 40 of the carriage, and upon depressing the ?nger pad 41 the retractor will pivot about its mounting pin 42 to release the carriage for movement by its spring 34 against the micrometer gauging plunger 3 which in turn transmits any imparted movement to the ‘pointer 5. For snap gauging use of the instrument, the retractor may be held inoperative or in its de pressed position against the tension of its spring 31 by a latch pin 43 which is slidably mounted in the standard 9 for projection over the ?nger pad 4|, as indicated by the broken lines in'Fig. 1. The calliper ?ngers have their active portions disposed in coplanar relation, as shown. in. Fig. 3, to engage diametrically opposing portions in a recess 44 of the workpiece 45 (Fig. 2) when re leased by the retractor. To center the work piece for so engaging such opposed portions there is provided a centering pin 46 in the form of a screw which is adjustably carried on a supporting 4 checking a given part of the workpiece the table may be ?xed by setting the screw 20, but where it is desired to check a long bore at plural points the workpiece may be pressed downwardly to depress the table for the desired extent while the table the meanwhile supports the workpiece in its normal position at all times. After countere acting pressure is relieved the spring 13 will re store the table to its normally elevated position as determined by the location of the lower stop [4. The parallel spring linkage 29 provides a practical support for holding the movable ?nger 212 in an upright position throughout its gauging range for greater accuracy, the carriage actually forming a part of this ?nger for impressing its -15 movement on the actuator 3. Because the ?nger is normally spaced from the actuator the microm eter .mechanism will be protected against im parted movement attending the placement and. 20 removal of the workpiece over the ?ngers, the actual movement of the plunger being relatively small as compared to the movement of the car riage allowed to facilitate the placement of the workpiece over the contracted ?ngers. post 41. By means of this construction the'cen While the foregoing description has been given tering pin is disposed radially in the recess and 25 in detail, it is not intended thereby to restrict serves to dispose the calliper ?ngers in a diam the invention since the inventive principles in etral plane thereof normal to the centering volved are capable of embodiment in other physi pin. If a larger recess or bore is to be gauged cal structures without departing from the spirit‘ the-centering pin will be extended a greater dis tance from its post '41, and if a smaller recess is 30 of the invention or the scope of the appended claims. to be checked the pin will be withdrawn. The What is claimed is: , post 41 is mounted in normally ?xed relation l. A gauge comprising an indicator, an-actua with the stationary calliper ?nger 23 although tor connected thereto by motion amplifying it may be adjusted to accommodate di?erent sizes of recesses. For this purpose the post 41 is formed 35 means, a pair of internal calliper ?ngers, one ?xed and the other movable, a ?oating support with a slot 48 through which the slide 26 extends. carrying the movable ?nger, resilient means act' By means of a clamp nut 49 thepost is clamped ing through the floating support to move the ?rmly against the side of the standard 9, the nut actuator as permitted by the engagement‘of the reacting through the slide to draw the head 53, on the inner end of the slide, clampingly against 40 movable ?nger with a workpiece,an upright‘post interposed between the ?ngers and a transversely the base portion of the'calii-per ?nger 23. ‘Con extending centering pin projecting from the post sequently the tightening of the nut effects the at a normal to the plane of movement of the securement of both the calliper ?nger and the movable ?nger and cooperating with both ?ngers post simultaneously. In use, the calliper ?ngers are normally in , to provide -a. three-point contact within a recess in the workpiece for centering the latter one-the contracted relationship for having the workpiece ?ngers. I placed thereover and thereafter the retractor is 2. A comparator gauge comprising a pairof depressed to release the ?oating carriage for ac internal calliper ?ngers for engaging diametri tion by its spring 34. The movable calliper ?nger cally opposed points on a wall of a recess in a 22 will thereupon move against the recess wall workpiece, one ?xed and the other movable, re of the workpiece while the ?xed calliper ?nger 23 leasable means normally holding the ?ngers in is engaged at a diametrically opposed point, being contracted relation, a work centering'pin, a post supported laterally by the centering pin 46, ‘as supporting the pin radially between the ?ngers shown in Fig. 3. The extent of movement of the movable ?nger will be impressed on the plunger 55 and normal to the plane of the ?ngers to’ co operate with the latter in providing -a three 3 and indicated by the pointer 5. If the pointer point contact with the‘ workpiece, and means for moves beyond or short of the two tolerance in adjusting the centering pin on the post and with dicators 8, the workpiece will be rejected‘ as being respect to the ?ngers. oversize or under size. If the pointer rests be 3. A gauge having a base, a pair of internal tween the tolerance indicators, the workpiece‘is 60 calliper ?ngers, a-slide adjustable onthe base and acceptable. By reason of the fact the ?ngers having parts extend from the opposite side there are normally contracted with respect to each of, one of the ?ngers being ?xedly carried by one other, the checking of quantities of workpieces part of the slide, a ?oating support for the other may be accomplished in rapid succession since it is only necessary to manipulate the vretractor 65 ?nger, means for adjusting the slide to position its ?nger, a work centering post adjustably car once in the testing of each piece. ried by the other part of the slide, and means When the instrument is used for snap‘ gauging, acting concurrently to secure the centering post during which operation the retractor will be nor and the slide carried ?nger at their given ad mally held depressed by the latch ‘pin 43, the workpiece is arranged over the ‘then normally 70 justments. 4. A gauge comprising ‘a'base, a'pair of internal separated calliper ?ngers and the indication by calliper ?ngers, one of which ?ngers being ?xed the pointer promptly noted without further to the base, means supporting the other ‘?nger manipulation. ’ ‘ for movement against the wall- of ya recessin a The workpiece will ‘be properly ‘supported 'by workpiece, a work squaring table having a slot the work positioning :or squaring ‘table 11. "For 2,411,292 through which the ?ngers extend at a normal to the table surface, manually controlled means be neath the table operable to so move said other the table to project the ?ngers more or less in the recess of the workpiece in accordance with the hand pressure on the latter, stop means ad~ ?nger, means resiliently supporting the table for justably regulating the extent of table depression, up and down movement under hand pressure to project the ?ngers more or less, and cushion means for limiting such up and down movement. 5. A gauge comprising a base, a pair of inter said stop means. and means for cushioning the table arrest by 7 '7. A gauge comprising micrometer mechanism having an indicator and an actuator, a pair of nal calliper ?ngers, one of which ?ngers being calliper ?ngers, a support, on which one ?nger ?xed to the base, means supporting the other 10 is ?xed, resilient means yieldably urging the other ?nger for movement against the Wall of a recess ?nger toward an operative relationship with re~ in a workpiece, a work positioning table having spect to the actuator to impress the position of a slot through which the ?ngers extend at a the movable ?nger on the indicator, spring means normal to the table surface, means resiliently normally acting in counteraction of the resilient supporting the table for up and down movement 15 means to hold the movable ?nger out of operative 7 to project the ?ngers more or less, manually con relationship with the actuator whereby a work trolled means beneath the table operable to so move said other ?nger, and means for holding piece may beplaced against the calliper ?ngers Without affecting the micrometer mechanism, a the manually controlled means inoperative. Work table having a slot through which the ?ngers 6. A gauge comprising a base, a pair of internal project upwardly, the slot extending in the direc calliper ?ngers, one of which ?ngers being ?xed 20 tion of movement of the movable ?nger, means to the base, means supporting the other ?nger resiliently supporting the table for movement for movement against the wall of a recess in a transverse to that of the movable ?nger, and workpiece, a work squaring table having a slot means manually controlled for releasing said re through which the ?ngers extend at a normal to silient means for functioning as aforesaid. the table surface, means ‘resiliently supporting ANTON IRAPPL.