EP0555211A1 - Calibre tampon - Google Patents

Calibre tampon

Info

Publication number
EP0555211A1
EP0555211A1 EP91900652A EP91900652A EP0555211A1 EP 0555211 A1 EP0555211 A1 EP 0555211A1 EP 91900652 A EP91900652 A EP 91900652A EP 91900652 A EP91900652 A EP 91900652A EP 0555211 A1 EP0555211 A1 EP 0555211A1
Authority
EP
European Patent Office
Prior art keywords
gage
thread
threaded
housing
cam
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP91900652A
Other languages
German (de)
English (en)
Other versions
EP0555211A4 (fr
Inventor
Gerald K. Sentman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0555211A1 publication Critical patent/EP0555211A1/fr
Publication of EP0555211A4 publication Critical patent/EP0555211A4/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B3/00—Measuring instruments characterised by the use of mechanical techniques
    • G01B3/46—Plug gauges for internal dimensions with engaging surfaces which are at a fixed distance, although they may be preadjustable
    • G01B3/48—Plug gauges for internal dimensions with engaging surfaces which are at a fixed distance, although they may be preadjustable for internal screw-threads

Definitions

  • This invention relates to a gage for determining the location of the pitch cylinder of a threaded post or bore in a workpiece.
  • the gage of the present invention is also useful in determining the amount of positional tolerance a threaded feature has used on the workpiece, orientation of the pitch axis relative to the surface of the workpiece, and thread feature tolerances.
  • threaded elements on a workpiece such as a threaded post or bore.
  • Several features of the threaded elements are inspected, including position on the workpiece, orientation and concentricity with other features on the workpiece, perpendicularity with the surface of the workpiece, and pitch diameter.
  • inspection of each of these features is performed with a separate gage.
  • positional accuracy is determined using a functional gage with hole locations corresponding to the correct bore locations in the workpiece.
  • Separate unthreaded gage pins pass through the functional gage holes and into the workpiece bores only if the bore locations are within tolerance.
  • the unthreaded gage pins are integral with the functional gage. In either case, inspections of this type are not based on the pitch cylinder axis of the threaded element on the workpiece, which induces some error into the inspection.
  • even the use of a threaded gage pin does not necessarily establish the proper pitch cylinder axis due, for instance, to perpendicularity errors in the threaded workpiece bore.
  • the pitch cylinder is an imaginary cylinder formed such that the diameter of the cylinder intersects the thread profile, or flanks, where the width of the thread and groove are equal.
  • the pitch cylinder of a threaded feature is a cylinder formed by thread pitch diameters spaced along the length of the feature.
  • the axis of the pitch cylinder can be defined using a minimum of four points of contact, axially and circumferentially spaced in two groups along the length of the threaded feature. Once the axis of the pitch cylinder is defined, positional aspects, for instance, can be easily gaged. To applicant's knowledge, there are no inspection gages available that accurately locate the axis of the pitch cylinder of the threaded feature to be inspected.
  • a gage threaded to the pitch cylinder can establish the pitch cylinder axis only when it is exactly the size of the threaded feature, and when there is no play or slop when it is engaged onto the threaded feature.
  • a threaded gage pin of this sort would be virtually impossible to engage, and, at any rate, relatively expensive to manufacture.
  • inspection gages are limited to a single function - i.e., determining positional accuracy, assessing perpendicularity, or inspecting the limits of size of the threaded feature. Thus, several gages are required to inspect one workpiece. Due to the precision machining of these gages, their cost is generally high. In order to reduce this cost, one option is to provide a multi-function gage, not yet available in the prior art, useful for inspecting thread position, orientation and limits of size of a threaded feature on a workpiece. Summary of the Invention
  • a pitch cylinder gage with a rotary camshaft mounted within a cylindrical housing having a threaded outer surface adapted to engage the threads of a threaded bore on a workpiece.
  • the housing defines axially separated sets of cavities extending radially through the threaded outer surface and the camshaft includes a rotary cam portion radially adjacent each set of cavities.
  • the gage further includes a flank contact element positioned within each of the cavities, the flank contact elements each being radially extendable into contact with a thread flank of the bore in response to rotation of the rotary camshaft with respect to the housing.
  • a pitch cylinder gage is provided with at least four means for tangentially engaging the thread grooves of a threaded feature on a workpiece, and with a retaining means for the engaging means which includes means for axially spacing a first plurality of the engaging means and for circumferentially spacing a second plurality of the engaging means.
  • the pitch cylinder gage also includes rotatable means for moving the tangentially engaging means into engagement with the thread grooves whereby a cylinder coaxial with the pitch cylinder of the threaded feature is spatially defined.
  • the rotatable moving means includes a cam element of circumferentially varying radius rotatably coupled to the retaining means and adapted to contact the tangential engaging means and move them into engagement with the thread grooves when rotated relative to the retaining means.
  • a pitch cylinder gage is provided with a cylindrical housing having a threaded outer surface adapted to engage the threads of a threaded bore on a workpiece, the housing defining axially separated sets of cavities extending radially through the threaded outer surface.
  • the pitch cylinder gage includes an elongated post concentric with and rotatable within the housing, the post having a circumferentially varying radius defining a rotatably actuated cam.
  • the pitch cylinder gage also includes a flank contact element positioned within each of the cavities, the flank contact elements each being radially extendable into contact with the thread flank of the bore in response to rotation of the cam with respect to the housing.
  • FIG. 1 is a side elevational view of the thread pitch cylinder gage of one embodiment of the present invention.
  • FIG. 2 is a partial cutaway end view of the thread pitch cylinder gage shown in FIG. 1.
  • FIG. 3 is an enlarged cross sectional view of the thread pitch cylinder gage shown in FIG. 2, taken along line 3-3 and viewed in the direction of the arrows.
  • FIG. 4 is an enlarged view of the ball and retaining cavity in the thread pitch cylinder gage shown in FIG. 1, taken along line 4-4 and viewed in the direction of the arrows shown, with a portion of the sleeve cut away.
  • FIG. 5 is a cross sectional view of the thread pitch cylinder gage of a second embodiment of the present invention, the cross section being taken along a thread of the gage.
  • FIG. 6 is a side partial cross sectional view of the thread pitch cylinder gage of a third embodiment of the present invention.
  • FIG. 7 is a side view of the gage post of the thread pitch cylinder gage of a fourth embodiment of the present invention.
  • FIG. 8 is a side cross sectional view of the thread pitch cylinder gage of a fifth embodiment of the present invention adapted for use with a male threaded workpiece.
  • FIG. 9 is an illustration of the use of the thread pitch cylinder gage of the present invention in conjunction with a workpiece and a functional gage.
  • FIG. 10 is a side view of an alternative embodiment of a thread pitch cylinder gage with rotary camshaft according to the present invention.
  • FIG. 11 is a cross-sectional view of the gage illustrated in FIG. 10.
  • FIG. 12 is an isometric sectional view of the threaded end of the gage of FIGS. 10 and 11, with a portion of the rotary camshaft exposed to further illustrate the helical cam surface.
  • FIG. 13 is an end view of the threaded end of the gage shown in FIG. 10, taken along the lines 13-13, with portions cut away to the respective depths of three balls to further illustrate the orientation of balls within each of two axially spaced sets of cavities.
  • FIG. 14 is an enlarged view of a retaining cavity, associated ball, and portion of the helical cam surface in the gage as illustrated in FIG. 13.
  • FIG. 16 is a cross-sectional side view of a further alternative embodiment of a gage with rotary camshaft according to the present invention.
  • FIG. 17 is an enlarged view of a portion of a retaining clip assembly shown in FIG. 11.
  • FIG. 18 is an enlarged view of a portion of another retaining clip assembly shown in FIG. 11.
  • FIG. 19 is a cross-sectional view of the portion of the gage of FIG. 10 lying in the plane indicated by line 19-19 in FIG. 11.
  • FIG. 20 is a cross-sectional view of the portion of an alternative embodiment of the gage of FIG. 10 lying in the plane indicated by line 19-19 in FIG. 11.
  • the retaining cap 24 is a ring that is press-fit onto the bearing surface 22.
  • the retaining cap 24 may also comprise a ring that is press-fit onto a reduced diameter portion of bearing surface 22.
  • the retaining cap can be integral, or one-piece, with the gage post 12, with the sleeve 14 engaged between the cap 24 and the head 20 using a typical cold shrink-fit process.
  • the outer diameter of the retaining cap may not exceed the MMC size of the minor diameter of the internal threads in the workpiece, otherwise the gage 10 cannot enter the workpiece bore.
  • the bearing surface 22 has a maximum outer diameter equal to the least material condition (LMC) size of the pitch diameter minus 1.5 x the best wire size (that is, the best wire size used in determining the pitch diameter of the workpiece threads in a standard gauging procedure) .
  • the bearing sur ace 22 includes a key 26 projecting axially from the gage head 20.
  • the sleeve 14 includes a notch 28 complementary to key 26, so that when the sleeve 14 is installed on gage post 12, the key 26 will engage in the notch 28 to prevent rotation of sleeve 14 relative to bearing surface 22.
  • Adjacent each end of the externally threaded sleeve 14 is a collection of retaining cavities 30, each formed by a bore through the externally threaded sleeve 14.
  • a ball 32 is trapped within each of the retaining cavities 30.
  • the chamfer 36 is provided primarily as an assembly convenience to retain the balls as the gage post is inserted into the sleeve 14.
  • the chamfer 36 may be eliminated to reduce the precision machining required, at the expense of a more cumbersome procedure to assemble the gage 10.
  • the retaining cavity 30, and consequently the ball 32, are centered between the flanks 17 of the thread 16.
  • the crown 16a of the thread 16 is crimped at location 38 on opposite sides of retaining cavity 30 that is cut through thread 16, as shown in FIG. 4.
  • the crimped portions 38 retain the ball 32 within the cavity 30.
  • the outer surface of the ball extends beyond the flanks 17 of the thread 16.
  • the ball portions 32a that extend beyond the flanks 17 tangentially engage the thread grooves of the internally threaded bore of the workpiece when the ball is positioned as shown in solid lines in FIG. 3.
  • the sleeve 14 is, effectively, locked into contact with the internally threaded bore of the workpiece.
  • the diameter of the balls 32 is equal to the best wire size recommended in standard practice for the particular thread pitch of the workpiece threads. Balls sized in this manner will contact the flanks of the thread grooves at the pitch diameter of the workpiece threaded bore to insure that the balls will properly lock in the bore and that the pitch cylinder axis will be properly defined.
  • the bearing surface 22 of the gage post 12 is provided with a cam surface 40 that is indented from the bearing surface and sloped as shown in FIG. 3.
  • the cam surface 40 slopes radially inwardly from the outer diameter of bearing surface 22 toward end surface 42.
  • the cam surface 40 is situated as shown so that the ball 32 has just begun to contact the incline of cam surface 40.
  • the cam surface is in position 40' and the ball projects radially inwardly from the inner diameter of sleeve 14.
  • the ball portions 32a' are within the flanks 17 of the thread 16 so that the ball portions 32a' do not contact the internal threads of the workpiece.
  • the balls When the workpiece pitch diameter is at the large end of the tolerance band, the balls must be moved farther along the cam surface before the balls contact the workpiece threads, in some cases, until the balls are on the bearing surface beyond the junction between the cam surface and the bearing surface.
  • This feature of the thread pitch cylinder gage 10 allows the gage to be used to establish a pitch cylinder axis, regardless of the feature size of the workpiece threads.
  • a thread pitch cylinder gage 50 includes an externally threaded sleeve 52 with a plurality of retaining cavities 56 and balls 58, as shown in FIG. 5, similar to that employed in the sleeve 14 of the former embodiment.
  • the cross-section in FIG. 5 is taken along the continuous thread 53 of sleeve 52.
  • Gage post 54 replaces gage post 12 of the previous embodiment.
  • the gage post 54 does not include the key 26 and notch 28 arrangement, because gage post 54 is adapted to rotate within externally threaded sleeve 52.
  • the gage post 54 of the second embodiment includes a flat section 62 radially adjacent each of the retaining cavities 56.
  • each flat section 62 is a curved bearing surface 60 that has the same diameter as bearing surface 22 of the first embodiment.
  • the flat sections 62 act as cam surfaces to gradually force the balls 58 outwardly until the balls contact the internal threads of the workpiece, in a similar fashion to that previously described with reference to the first embodiment. In the normal circumstance, the balls will lock between the flat sections and the internal threads.
  • the gage post 54 may be rotated further relative to the sleeve 52 so that the balls ride up the flat sections 62 onto the bearing surface 60.
  • a key and notch arrangement similar to that employed in the first embodiment can be provided.
  • the gage post 54 must be allowed to rotate within sleeve 52 in order to lock or retract the balls 58, some axial separation between the key and notch must be provided so that they can be completely disengaged to allow the required rotation.
  • the gage post 54 has a constant cross-section along its length.
  • the balls at either end of the sleeve 52 must be axially aligned so that the flat sections 62 will coincide with the circumferentially spaced balls at both ends.
  • an additional set of flat surfaces would be required midway along the curved bearing surfaces 60.
  • the externally threaded sleeve 70 and ball assembly 72 is identical to the externally threaded sleeve 14 and its ball assembly in the first embodiment.
  • the gage post of the third embodiment includes a gage head 76 similar to gage head 20, a bearing surface 78 and a cap 80 similar to retaining cap 24 of the first embodiment.
  • the bearing surface 78 includes a pair of cam sections 82 located radially adjacent each of the ball assemblies 72 in the externally threaded sleeve 70.
  • Each of the cam sections 82 includes a frusto-conical portion 84 beneath each ball in the ball assemblies 72.
  • the split between the bearing surface halves 94a and 94b is at the inclined cam ends 98a and 98b, respectively.
  • the first half 94a of the bearing surface includes a frusto-conical portion 100a, while the second half 94b includes a reverse frusto-conical portion 100b.
  • the gage post 90 is adapted to rotate relative to the externally threaded sleeve, as shown by the counterclockwise arrow in FIG. 7.
  • the inclined cam ends 98a and 98b rotate against each other forcing the first and second halves 94a and 94b apart, as shown by the heavy arrows.
  • the frusto-conical sections 100a and 100b urge the balls outwardly into the locking position.
  • gage post 90 will maintain a minimum of six points of contact with the thread flanks, even when the thread is tapered, that is when one end of the thread is larger than the other end.
  • This particular embodiment consequently, is also useful for gauging tapered pipe threads.
  • FIG. 8 a longitudinal cross sectional view is shown of a thread pitch cylinder gage 110 adapted for use with a male threaded post on the workpiece.
  • the gage 110 includes a hollow gage post 112 and an internally threaded sleeve 114.
  • the sleeve 114 includes internal threads 116, recesses 118 and balls 120 trapped within the recesses 118.
  • a workpiece 140 includes four internally threaded bores 142.
  • a pitch cylinder gage 130 is threaded into each of the bores 142 and locked within the bores by pulling upwardly on the gage post 132.
  • the gage post 132 is translated axially relative to the externally threaded sleeve 134, the six balls trapped within the recesses in the sleeve 134 are urged outwardly by cam portions on the gage post 132 so that the balls tangentially engage the internal threads of the threaded bore 142.
  • the pattern of balls in the externally threaded sleeve 134 spatially define a cylinder having an axis 144 that is coaxial with the pitch cylinder axis of the threaded feature, regardless of the feature size of the threaded bores 142.
  • a functional gage 146 having a number of gage holes 148 is placed over the gage heads 136 of the pitch cylinder gages exposed above the surface of the workpiece 140.
  • the gage head 136 of the thread pitch cylinder gage 130 has an outer diameter equal to the maximum material condition (MMC) size of the major diameter of the screw or bolt it represents.
  • MMC maximum material condition
  • the thread pitch cylinder gages 130 in conjunction with the functional gage 146 identifies the presence of interference between outside diameters of screw, represented by the pitch cylinder gage, and the bores in the mating part, represented by the functional gage, when the mating part is engaged with the workpiece.
  • the thread pitch cylinder gage 130 complies with the measurement standards defined in the American National Standards Institute (ANSI) Standard Y14.5M-1982, paragraph 5.5.
  • the gage 130 can be used in conjunction with a coordinate measuring machine, rather than with a functional gage. Once the inspection operation is complete, the gage 130 can be unlocked from the threaded bore 142 by pushing the gage post 132 into the threaded sleeve 134 until the balls follow the cam surfaces on the gage post into the retracted position. The pitch cylinder gage 130 can then be unscrewed from the bore 142 in the normal fashion.
  • the gage will not go into the bore 142 if the lower limit of the pitch cylinder diameter of the threaded bore 142 has not been met.
  • the present invention encompasses replacing the ball in the thread pitch cylinder gage with an element sized to tangentially engage at least one point in the thread groove. Since the thread is generally tapped in a single operation, the form of the thread groove will be constant and determinable. Thus, a pitch cylinder gage in which the ball elements are replaced with radially extending pins that contact the thread root, for instance, will also define an axis coaxial with the pitch cylinder axis of the threaded feature. A gage using radial pins as described would be generally limited to use in determining the positional accuracy of a threaded feature only.
  • gage post in the embodiment of the present invention shown in FIG. 5 as one form of a rotary camshaft.
  • a rotary camshaft or rotatably actuated cam according to the present invention may have a number of other cam shapes, including a helical cam, as will now be described in further detail with reference to FIGS. 10-16.
  • the gage shown in FIG. 10 includes a threaded sleeve 151 and a graduated sleeve 152 which, as will be described, are rotatable with respect to one another about a common axis extending longitudinally through the center of the gage.
  • Sleeve 151 and its threaded end are preferably integrally formed.
  • Graduated sleeve 152 and a friction sleeve or thimble 153 positioned adjacent thereto are relatively fixedly mounted on a central gage post 155 which extends through the gage and includes a helical cam or camshaft 155a within the threaded end of sleeve 151, as shown more clearly in FIGS. 11 and 12.
  • Gage post 155 is rotatably mounted within sleeve 151 and retained axially therein by retaining clip 156, which is secured within a pair of corresponding annular grooves provided for this purpose in sleeve 151 and post 155.
  • Two axially spaced sets of three balls 154 are retained between the flanks of threads of the threaded sleeve in radial alignment with respective portions of the camshaft, preferably in the orientation shown in FIGS. 10, 12 and 13. More specifically, the balls in each set are spaced 120° apart from each other around the circumference of the threaded end of sleeve 151, as shown in FIG. 13, a cross-sectional end view in which portions of the threaded end of the gage are cut away to the respective depths of the three balls in one of the two sets to illustrate the 120° circumferential spacing of the balls.
  • the radius of camshaft 155a on gage post 155 varies circumferentially, i.e., as a function of angle of rotation about the camshaft and post axis, in a corresponding manner with respect to each ball in the gage such that, for any given angular position of the camshaft within the gage, the radius of the cam is the same at each point of contact with a ball.
  • FIG. 14 A retaining cavity 170, an associated ball, and a portion of the helical cam surface 172 are shown in detail in FIG. 14, which further illustrates a lip 169 which is made by forming over the outermost corners of retaining cavity 170 to hold the ball in the gage.
  • An external view of the lips 169 on retaining cavity 170 is shown in FIG. 15.
  • Two balls are sufficient for such a gage to measure the pitch diameter of a threaded hole, although three balls are preferred for some size measurements.
  • Two sets of three balls spaced axially apart are preferable because they cause the gage to better align itself with the pitch cylinder axis of the threaded hole being inspected.
  • the radius of the cam varies according to position along the line of contact, i.e., circumferentially, and the radial extension of each ball 154 varies accordingly.
  • balls 154 are shown in their furthermost retracted position within the retaining cavities.
  • Clip 156 is positioned within groove 179 in post 155 prior to installation of threaded sleeve 151, which is slid over camshaft 155a and then over clip 156, with external force applied to the clip to compress it into groove 179 long enough to allow a shoulder 168 on threaded sleeve 151 to pass over.
  • Clip 156 springs outward into groove 178 when grooves 178 and 179 are aligned, thereby locking the threaded sleeve onto the gage post while allowing the threaded sleeve to rotate freely.
  • Groove 178 is provided with a tapered surface 177 on the side of the groove nearest to shoulder 168 in order to facilitate disassembly by transmitting force radially to compress clip 156 into groove 179 as threaded sleeve 151 is removed from the post.
  • gage post 155 is provided with a recessed groove 159a for a coil slip spring 159 which is secured at one end to post 155, e.g., by means of a 90° bend in the coil tip, with the bent tip fitted into a hole provided for this purpose in the bottom or side of groove 159a.
  • the other end of the spring is unattached, and the spring is selected so as to fit in groove 159a with sufficient outward radial bias to produce a desired level of frictional engagement with thimble 153.
  • Slip spring 159 thus causes gage post 155 to turn with thimble 153 but prevents inaccurate measurements and possible damage to the gage or workpiece by allowing the thimble to slip when the torque applied to the thimble exceeds the force of friction between the spring and thimble.
  • This construction provides a uniform gaging force for all users and thereby ensures consistent, accurate gaging.
  • the spring is arranged so as to allow slippage when friction thimble 153 is turned clockwise but to bind up in response to counterclockwise rotation of the thimble and thereby effectively lock the thimble to the gage post during counterclockwise rotation.
  • the gage described above is one form of an indicating thread gage for internal threads and is preferably calibrated with the aid of a thread-setting solid ring gage having a known pitch diameter certified by the manufacturer and traceable to the National Bureau of Standards.
  • the thread gage to be calibrated is inserted into the ring gage to a point at which at least one set of thread balls is in position to engage the internal threads of the ring gage.
  • the friction thimble is then turned until it slips, and the reading from the thread gage is then compared with the known value for the ring gage. Any necessary adjustment is made by rotating sleeve 152 with a spanner wrench designed to fit into hole 165 in the graduated sleeve.
  • the sleeve is rotated until the reading from the thread gage matches the known value from the ring gage.
  • the calibration reading of the thread gage is increased by rotating sleeve 152 clockwise while turning friction thimble 153 in the opposite direction.
  • the calibration reading is decreased by rotating sleeve 152 counterclockwise against an opposing force which is preferably provided with thimble 153 removed and with a spanner wrench inserted into a hole 167 (FIG. 11) provided in gage post 155 for this purpose.
  • the opposing force may be provided by the plunger mechanism shown in FIG. 20.
  • FIGS. 19 and 20 illustrate alternative constructions of a spring-loaded plunger mechanism designed to provide a tactile indication of the angular position of the rotary camshaft.
  • the position indicated is that in which the balls are in their furthermost retracted position, whereby the tactile indication facilitates insertion and removal of the gage from a threaded hole under inspection.
  • plunger 161 urges plunger 161 toward shoulder or corner 168, which is adjacent thereto on threaded sleeve 1, and urges the plunger into a groove 180 in shoulder 168 when gage post 155 is rotated to the position in which plunger 161 and groove 180 are aligned. As indicated earlier, this position preferably corresponds to that in which the balls are in the furthermost retracted position. Constructed as shown in FIG. 19, the plunger mechani.sm permi.ts rotati.on of post 155 i.n ei.ther direction past the position in which plunger 161 is in groove
  • the plunger When rotated from this position, the plunger is forced against the spring which thereupon compresses and allows the plunger to slip out of the groove and into contact with chamfered corner 168.
  • the orientation of the plunger mechanism at an oblique angle with respect to the longitudinal axis of the gage as shown in FIG. 11 permits the use of such a mechanism even in small gages. Direct radial orientation of a plunger mechanism is possible in larger gages, as are ratchet mechanisms.
  • a square chamber and corresponding square plunger 181 cooperate to prevent rotation of the plunger within post 155.
  • the outermost surface 182 of plunger 181 is beveled as shown in the drawing so as to prevent counterclockwise rotation of gage post 155 beyond a point defined by notched groove 183 in corner 168.
  • Beveled surface 182 permits clockwise rotation, however, sliding along the correspondingly tapered surface of notched groove 183 during clockwise rotation and thereby forcing plunger 181 against spring 157 into its retracted position.
  • beveled surfaces may similarly be provided on the leading surfaces of friction thimble 153 and threaded sleeve 151 so as to facilitate their passage over retaining clips 156 and 158 during assembly.
  • either or both sets of balls may contain more than three balls if desired, and additional balls may be located between the two sets of balls, either as a separate intermediate set of balls or as part of a single, continuous, helical pattern of evenly spaced balls.
  • the size of the balls themselves is the principal limitation on the number of balls capable of being contained within such a gage.
  • camshaft 155a has been described above as a continuous helical camshaft, it may alternatively be provided with a helical cam surface only in those portions radially adjacent to each set of balls. That is, the rotary cam portions which engage the balls may be interconnected by a rigid, cylindrical connecting shaft, for example, instead of the continuous helical camshaft described above.
  • the active cam portions may have a right-hand thread configuration, as in the embodiment shown in FIG. 10 et seq., or may have a left-hand thread configuration.
  • two rotary cam portions may be made independently rotatable on separate coaxial gage posts within the thread sleeve, whereby the gage automatically compensates for variations in inside diameter and thus enables proper alignment with the pitch cylinder axis in such a situation.
  • the gage post is not fixed axially within the threaded sleeve but instead is provided with a threaded portion such as on a spindle screw of a micrometer, and sleeve 151 is provided with corresponding internal threads, both of said threaded portions being axially spaced from the aforementioned threaded end of the sleeve.
  • the spindle screw structure may, for example, have a right-hand thread configuration as in a conventional micrometer, and preferably has a substantially smaller pitch than the helical camshaft.
  • a right-hand thread configuration for the helical camshaft rotation of the camshaft during normal operation also produces longitudinal advancement of the camshaft, the combination of which results in increased resolution for the gage.
  • the threaded sleeve has no shoulder such as shoulder 168 in FIG.
  • the principles of the invention can also be applied to internal bores, gears and splines. That is, whereas the present invention has been described in terms of an internal thread indicating gage as the preferred embodiment for measuring pitch diameter, a gage according to the present invention could alternatively be designed to measure diameter in straight bores or pitch diameter in internal splines and gears, as well as to locate the centerline axis of such features. If desired, the balls engaging the rotary camshaft may be retained within a cylindrical cage, instead of in a threaded portion of sleeve 151, in a gage to be used for inspection of bores.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • A Measuring Device Byusing Mechanical Method (AREA)

Abstract

Un calibre de cylindre de pas de vis destiné à un passage à filetage interne dans une pièce, comprend, selon un mode de réalisation, une douille filetée (151) et une douille graduée (152) pouvant être tournées l'une par rapport à l'autre autour d'un axe commun s'étendant longitudinalement à travers le centre du calibre, la douille graduée et une douille de frottement (153) placée de manière adjacente à celle-ci étant montées relativement fixes sur une support de calibre central qui comprend un arbre à cames hédicoïdal à l'intérieur de l'extrémité filetée de la douille filetée. Deux séries de trois billes (154) espacées dans un sens axial sont retenues entre les flancs des filets de la douille filetée en alignement radial avec des parties respectives de l'arbre à cames hélicoïdal.
EP91900652A 1990-10-29 1990-10-29 Calibre tampon Withdrawn EP0555211A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1990/006276 WO1992008099A1 (fr) 1990-10-29 1990-10-29 Calibre de cylindre de pas de vis

Publications (2)

Publication Number Publication Date
EP0555211A1 true EP0555211A1 (fr) 1993-08-18
EP0555211A4 EP0555211A4 (fr) 1994-04-20

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EP91900652A Withdrawn EP0555211A1 (fr) 1990-10-29 1990-10-29 Calibre tampon

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WO (1) WO1992008099A1 (fr)

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CH703905A1 (fr) * 2010-10-01 2012-04-13 Daniel Rochat Pige, jauge de précision et support pour de telles jauges.

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SU164682A1 (ru) * В. Г. Бел Прибор для измерения среднего диаметра виутренней резббб1
US2249954A (en) * 1939-08-28 1941-07-22 Hellberg Helge Gauge for measuring and checking dimensions and forms
DE868358C (de) * 1943-05-05 1953-02-23 Helmuth Dr Esser Vorrichtung zum Pruefen der Masshaltigkeit von Innengewinden und Verfahren zur Herstellung der Vorrichtung
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Title
See also references of WO9208099A1 *

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WO1992008099A1 (fr) 1992-05-14
EP0555211A4 (fr) 1994-04-20

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