Dec. 10,1946. Ü R_Y_MOSS " ’ 2,412,413 GAUGING DEVICE lFiled Aug. 2, 1945 ATTORN EY 2,412,413 Patented Dec. 10, 1946 UNITED STATES PATENT OFFICE 2,412,413 GAUGING nevica Richard Y. Moss, Dayton, Ohio, assigner to The Sheflield Corporation, Dayton, Ohio, a corpora tion of Ohio Application August 2, 1945,.Serial No. 608,477 5 Claims. (Cl. 33-174) 1 This invention relates to gauging devices and more particularly to gauging devices that measure or compare the size of workpieces by gauging the flow of iluid through leakage orifices. One object or” the invention is the provision of a gauging device embodying a pair of upright tapered flow tubes having floats responsive to the air flow through the tubes and each~ connected to a gauging member which is adapted for co operation with male and female parts intended to interfit with one another, adjustable index members being provided for the two tubes and 2, gauging device and the amount of clearance that piston would have in that cylinder can be ob served. T‘hus, the gauging device includes a work engaging spindle li», see Fig. 1, adapted to enter the hole of the cylinder or other workpiece to be gauged, and a gauging member l I having a groove or opening i2 to receive the piston or other male part intended to interfit the cylinder. The spin dle Hl has a leakage orifice or gauging nozzle I3 that cooperates with the inner surface of the workpiece or cylinder so that the clearance be tween the outer surface of this gauging >nozzle and the workpiece determines the amount of leakage ci duid supplied to the nozzle. The rate of fluid flow is shown by float I4 operable in a spondingly'in an opposite direction. Yflow tube l5 carried by the housing i5 of the Another object is the provision of a gauging gauging device. A flexible conduit Il connects device having a pair of flow tubes with indicating the gauging spindle lil to the upper end of the means responsive to the rate of iiow of fluid ñow tube l5. Air is supplied to the gauging in through gauging nozzles provided in members intended for cooperation with interfltting male 20 strument from the -factory air line and its pres sure is automatically held constant at any de and female parts to be checked or gauged, inter sired value by a suitable pressure regulator which connected index members being arranged for supplies the air under pressure to the lower end movement in opposite directions whereby the of the flow tube i5. The internal passage through movement of one indeX member to a point adja the flow tube tapers upwardly and gradually so cent the indicating means of one tube will auto~ that as the float is carried upwardly by the flow matically adjust a scale member or index for the ing air, the distance between the float and the other tube for direct reading of the clearance walls of the tube increases. The ñoat thus as between the male and female parts being gauged. sumes some position of equilibrium depending Other objects and advantages of this invention will be apparent from the following description, 30 upon the amount of flow taking place through the gauging nozzle. the appended claims and the accompanying The gauging member H is also provided with drawing, in which7 so arranged that as one of these members moves in one direction the other member moves corre Fig. 1 is a perspective view of a gauging device a gauging orifice at one side of the slot or open embodying the present invention; ing, cooperating with the outer surface of the showing the indicating and flow tube portions of the gauging device; that slot and facing towards the workpiece axis. A flexible fluid conduit i9 places the gauging Fig. 2 is a front elevation on an enlarged scale 35 workpiece or piston that might be arranged in Fig. 3 is a horizontal section of the line 3_3 of Fig. 2; and Fig. 4 is a vertical section of line 4-4 of Fig. 2. oriñce in communication with the upper end of a second flow tube 2t, which is arranged adjacent to or alongside of the tube i5. The tube 2D is similar to the tube l5 and is provided with a iloat 2l responsive to the rate of flow of fluid through Referring more particularly to the drawing, the invention as herein illustrated is incorporated that tube. The housing l@ is provided with suit in a gauging device for directly comparing or able supporting means for the tubes, which are measuring the clearance between male and fe male workpieces intended to cooperate with one 45 visible through an opening 22 in a front cover another in interíitting relation,vthese two work plate 23. An index arm 25 is adjustably mounted for movement along the tube l5. It has an index mark or line il@ that can be placed opposite the float is wherever that float might be patent of Willis Fay Aller, #2,254,259, granted 50 top of when the spindle lil is entered in the cylinder September 2, 1941. In accordance with the pres to be gauged. This index arm is provided on a ent invention, pistons can be successively applied block 21 which is guided for movement along the to the gauging device and at the same time the groove 28 in the housing E6. The front cover cylinder in which any piston is intended to co operate can be applied to another portion of the 55 plate 2i, which is secured to the housing by suit pieces being gauged simultaneously by separate Work engaging members and similar flow tubes of the character more fully disclosed in the prior 2,412,413 3 ' 4 able screws 29, holds the block 21'in the groove. The block 21 has a passage parallel to the length pieces to be gauged are then applied to the gaug ing Y of the tube, receiving a flexible cable 3 l. A thumb ' screw 32 threaded in the block 21 serves as a clamp to secure the cable and the block together, the thumb screw projecting through the clear ance space between the cover plate 23 and the housing I6 so it may be conveniently operated from the exterior of the housing whenever it is members. 1 ì ' Suppose that the float lll'takes some new posi tion when the workpieces are applied. The knob 44 is then turned until the index arm 25 is directly opposite this new position of the float. That automatically adjusts the scale plate 36 so that its Vzero mark should be opposite the float 2| if ' v there is the exact desired clearance between the necessary'to adjust the relative position of the 10 male and female members being gauged as existed in the masters. However, if this clearance block and the cable. i is alittle more or little less, that willV be directly At the opposite side of the housing there is shown by the position of the float 2l with respect another groove 33 guiding another block 34 hav to the scale markings on the index plate 36.V If ing a thumb screw 35 which connects the block to the flexible cable 3|. This block is also pro 15 lthe clearance is a little bit more than the exact 1/1o,ooo of an inch desired, the top of the float 2| ~ vided with an index member 3B. The arrange would be a little above the zero mark and the ment of the block, the cable and the grooves are amount of this increase of clearanceis directly similar for the two index members, but the index shown by the graduations on the index or scale members themselves are diiîerent as will be de 20 plate 35. The exact size of the male or of the scribed. female member need not be known, but the exact The cable 3| extends upwardly from block 21 clearance that would exist between the parts is` and is guided around guide pulleys 38 and 39. gauged directly in accordance with the present It then extends down through the block 34 and invention. Parts can therefore be selected t around guide pulley 4|), then over to an operat ing drum 4|. , It may have two turns around this 25 drum so that as the drum is turned the endless best cooperate with one. another. ' v It will be obvious that if the male part being gauged is slightly smaller than the standard, cable will be moved equally, moving the two index the increased air now through the tube 20 causes members and the two blocks, but in opposite the float 2| to assume a somewhat higher posi directions. The drum 4I is connected to a shaft 42 Ythat extends through an opening 43 in the 30 tion than with the standard. If the female part being gauged at the same time is also a little `cover plate 23 as shown in Fig. 4. A hand knob 44 is pinned to this shaft 42 so that the drum can be turned by means of the knob 44. smaller than standard there would be less ilow through the tube I5, so that as one float lowers ‘ theother ñoat should correspondingly rise, if the The grooves in the guide pulleys 38, 39 and 40 clearance between the workpieces is the desiredV are preferably V-shaped and so arranged that amount. Where the only >reading desired is the they contact the cable along their inclined side. amount of clearance'between the male and fe The cable is preferably held taut by a weighted male parts being gauged at the same time, itis roller 46 pivotally mounted in the housing at one unnecessary to provide a scale along the side side of the roller axis. The roller bears down 40 of the tube I5, but if the exact size of the female wardly on the cable between the pulley 4|! and the member is to be determined, a scale plate 5D, drum 4|. provided with graduations, is arranged along the The index member 36 that is carried by block tube I5 so that the size of the female part will 34 is in the form of a scale plate having scale be shown by the scale readings in comparison readings above and below the zero mark. The to the readings on the scale when the female readings on this scale plate directly show the standard is used. The scale plate 56 may also plus and minus variations from the desired clear extend _around back of the tube> 28 and` have ance between the male and the female members being gauged at the same time. graduations that maybe used in conjunction with that tube if desired. -The graduations on this ' Assume that theY spindle I0 engages a female work-piece or cylinder and a plunger or piston -scale plate need not be considered, however, in merely gauging the clearance between two parts is applied to the gauging member Vl I. The piston and -the cylinder are intended for interfìtting relation and it is desired to know if the amount of clearance these parts will have with one an- , other is too much or too little. The leakage present at the gauging orifice I3 determinesthe level of the float I4, and the leakage at the gauging orifice at the side of the groove I2 de termines the height of the float 2|. Assume that the male and female pieces being gauged are the standards or masters, and are of» exact known size'with the proper amount of clearance. This clearance may perhaps be l/mooo of an inch in case of certain kind of pumps and the amount of permissible tolerance from that desired clear ance may be one half that total clearance, plus or minus. With the standard pieces applied, the knobY 44 is adjusted until the index 25 is directly opposite the float i4 wherever that ñoat may be. The thumb screw 35 is loosened and the index or 'scaleV plate 35 is then moved along the cable until its zero line is directly opposite the top of the ñoat 2| wherever that float may be. YThis adjusts the gauge for the masters, and the Work intended to interñt with one another. While the formrof apparatus herein described constitutes a preferred embodiment of the in vention, it is to be understood that the inven tion is not limited to this'precise form of appara tus, and that changes may be made therein with out departing from the scope-oftheinvention which is defined in the appended claims. What is claimed is: ` l. A gauging'device comprising a pair of up-right flow tubes of tapering internal cross sec tional area, a support on which said tubes are arranged with their smaller ends lowermost, a work engaging member connected to one of said tubes and having a fluid discharge gauging noz- ` zle adapted for cooperation with the interior surface of a workpiece,V a work engaging Vmember ' connected t0 the other of said tubes and having a fluid discharge gauging nozzle adapted for co operation with the exterior surface of asecond workpiece intended to interfit with the iirst work piece, said tubes Veach having a float operable thereinin response to the rate of flow of fluid 7.5,' through the respective gauging nozzles, Yan ad 2,412,413 - 5 justable index member for each of said tubes adjustably mounted for movementI along the length of their respective tubes, and means in terconnecting said index members to cause equal but opposite movement of said members. Ul right iîow tubes of tapering internal cross sec tional area, a support on which said tubes are piece, said tubes each having a iioat operable members to cause relatively opposite movement arranged with theirsmaller ends lowermost, a work engaging member connected yto one of said tubes and having a iluid discharge gauging nozzle adapted ior cooperation with the interior surface 2. A gauging device comprising a pair of up of'a workpiece, a Work engaging member con right flow tubes of tapering internal cross sec nected to the other of said tubes and having a tional area, a support on which said tubes are fluid discharge gauging nozzle adapted for co arranged with their smaller ends lowermost, a operation with the exterior surface of a second Work engaging member connected to one of said workpiece intended to interñt with the first work `tubes and having a iiuid discharge gauging nozzle piece, said tubes each having a float operable l adapted for cooperation with the interior surface therein in response to the rate of flow of ñuid of a workpiece, a Work engaging member con through the respective gauging nozzles, an index nected to the other of said tubes and having a fluid discharge gauging nozzle adapted for co 15 member for each of said tubes adjustably mount ed for movement along the length of their re operation with the exterior surface of a second spective tubes, an interconnection for said index workpiece intended to interñt with the ñrst work of said members, means for operating said inter therein in response to the rate of flow of ñuid through the respective gauging nozzles, an index 20 connection to move said index members and means for relatively adjusting the position of said member for each of said tubes, means< for ad justably supporting said index members for move ment along the length oi' their respective tubes, index members with respect to said interconnec opposite movement. indicating the clearance between the workpieces. tion. 5. A gauging device comprising a pair of up means interconnecting said index members to cause equal but opposite movement of said mem 25 right flow tubes of tapering internal cross sec tional area, a support on which said tubes are bers, and means operable to adjust said members. 3. A gauging device comprising a pair of up arranged with their smaller ends lowermost, a Work engaging member connected to one of said right ilow tubes of tapering internal cross sec tubes and having a fluid discharge gauging nozzle tional area, a support on which said tubes are arranged with their smaller ends lowermost, a 30 adapted for cooperation with the interior surface of a workpiece, a work engaging member con work engaging member connected to one of said tubes and having a fluid discharge gauging noz nected to the other of said tubes and having a fluid discharge gauging nozzle adapted for co zle adapted for cooperation `with the interior operation with the exterior surface of a second surface of a workpiece, a work engaging member connected to the other of said tubes and having 35 workpiece intended to interlit with the iirst work piece, said tubes each having a float operable a iiuid discharge gauging nozzle adapted for co operation with the exterior surface of a Second therein in response to the rate of flow of fluid through the respective gauging nozzle, an ad workpiece intended to interiit with the iirst work piece, said tubes each having a float operable justable index member for each of said tubes, therein in response to the rate of flow of fluid 40 means for guiding said index members for move through the respective gauging nozzles, an ad ment along the lengths of their respective tubes, justable index member for each of said tubes, a ñexible cable interconnected to said members, one of said index members having a scale showing means guiding said cable to cause equal but oppo plus and minus variations from a normal clear site movement of said members, means for mov ance between the two workpieces, and means in 45 ing said cable to adjust said members, and an ter-connecting said indexes for simultaneous but index scale on one of said »members for directly 4. A gauging device comprising a pair of up .RICHARD Y. MOSS.