US3849890A - Micrometer with digital reading - Google Patents

Micrometer with digital reading Download PDF

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Publication number
US3849890A
US3849890A US00386180A US38618073A US3849890A US 3849890 A US3849890 A US 3849890A US 00386180 A US00386180 A US 00386180A US 38618073 A US38618073 A US 38618073A US 3849890 A US3849890 A US 3849890A
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US
United States
Prior art keywords
prisms
micrometer
micrometer screw
radial
cam
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Expired - Lifetime
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US00386180A
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English (en)
Inventor
G Vadi
J Jeannet
J Leuba
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Tesa SARL
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Tesa SARL
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Publication date
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    • 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
    • G01B3/18—Micrometers

Definitions

  • This invention relates to a micrometer with digital reading comprising a micrometer screw, a body axially fixed to said micrometer screw and angularly fixed relative thereto, and prisms whose faces carry figures rotating in the body in front of .a window made in said body.
  • the present invention relates to a micrometer with digital reading comprising a movable micrometer screw engaged in a fixed support and a body axially fixed to said micrometer screw, said body being angularly fixed relative to the micrometer screw and wherein the prisms whose faces carry the figures rotate individually in the body on axes tangential to an imaginary circle concentric to the axis of the micrometer screw, the assembly of prisms being rotated by the micrometer screw concentrically relative to the axis of said micrometer screw and moving in front of a window made in said body, the individual rotation of said prisms being assured by a cam which is angularly fixed and in engagement with said prisms.
  • Micrometers are already known wherein the individual rotation of the rotating prisms is assured by a cam fixed to the casing of the system and acting axially on the prisms, i.e. the cam is arranged on the side of the prisms and whereby the active surface or surface which is in engagement with the prisms is orientated towards said prisms according to a general direction parallel to the axis of the micrometer screw.
  • this arrangement has serious disadvantages among which can be mentioned a large size in the axial direction and more particularly the fact that contact between the prisms and the cam can be interrupted if the member carrying the prisms has a slight axial play, which is substantially inevitable.
  • the micrometer according to the invention has for its object the elimination of said shortcomings. It is characterised in that it comprises a radially revolving cam angularly fixed to the body concentric to the axis of the micrometer screw and. arranged between the prisms ment of the micrometer screw 2 in the guidance tube 1 being controlled by a tolerance compensation system 3 which is also known and will not be described in detail here.
  • the micrometer screw 2 is extended by a rear pin 4 and a front pin, not shown, and controlling the movable feeler or feelers of the instrument.
  • a coaxial tubular support 5 whereon is slidingly mounted the front portion 6 of a sleeve 7 comprising a guidance shoe 8 engaged in a longitudinal groove 9 made along the tubular sup port 5 parallel to the axis thereof. Therefore the sleeve 7 can slide along support 1 while remaining angularly fixed thereto.
  • the rear portion 10 of sleeve 7 is fixed, for example, driven onto a ring 11 carrying an internal toothing 12.
  • Ring 11 has a roller path 13 wherein are located balls 14 via which a control drum 15 is mounted rotatably on said ring 11 and therefore on sleeve 7.
  • This control drum 15 comprises a hub 16 engaged on the rear pin 4 of the micrometer screw 2, said hub 16 being fixed to said pin 4 by a screw shown schematically by the broken line 17.
  • the free end of the pin 4 is engaged in a control ratchet 18 contiguous with drum 15, said control ratchet not being described in greater detail because it can be made in any adequate or known manner.
  • the micrometer screw 2 is also turned and moves axially in the guidance tube 1.
  • Simultaneously drum 15 which is fixed to pin 4 moves axially and drives sleeve 7 to which it is axially fixed as a result of the coupling of ring 11 and balls 14.
  • any axial movement of the micrometer screw 2 corresponds an identical and simultaneous axial movement of sleeve 7 which however remains angularly fixed.
  • a ring 32 On hub 16 of control drum 15 is rotatably mounted a ring 32 which is axially fixed to said hub 16, the mounting of ring 32 on hub 16 being assured by a ball race schematically,represented at 33.
  • Ring 32 has a hub 34 with peripheral teeth 35.
  • On drum 15 is rotatably mounted a pinion 36 out-of-centre relative to the axis of drum l5 and meshing on the one hand with the teeth 12 of ring 11 which is fixed to sleeve 7 and on the other with the peripheral teeth 35 of the hub of ring 32.
  • This system serves as a planetary gearing and when drum 15 is rotated pinion 36 is on the one hand rotated on its axis in the reverse direction due to its engagement with teeth 12 which are fixed and on the other it drives the rotary ring 32 via its teeth 35 in the same direction as drum 15 but at a different rotational speed.
  • this arrangement is not limitative and the drive of the rotary ring 32 by drum 15 can be direct and if desired the rotation speeds can be identical.
  • the rotary ring 32 has in known manner a series of lateral arms 37 forming a type of cage and between which are mounted rotatably on shafts 38 prisms 39 with five faces.
  • the prisms 39 are arranged concentrically relative to the pin 4 and their axes are respectively tangential to an imaginary circle concentric to pin 4. It should be noted that although in the example described theprisms 39 each have five faces it is possible to use prisms having a different number of faces, for example, four or six faces.
  • the rotary ring 32 as well as the prisms 39 move in front of a window 40 arranged in the wall of sleeve 7. Window 4 has dimensions such that it is possible for the corresponding faces of several prisms 39 to appear simultaneously.
  • FIGS. 41 FlG. 2 corresponding to fractions of the units of the scale chosen to indicate the measurements performed by the instrument, for example, tenths and one hundredths of units while the rotary ring 32 carries lines 42 corresponding to fractions of the figures indicated on prisms 39 for example thousandths of units.
  • the fixed ring 11 has a reference line 43.
  • the faces of each of the prisms 39 may only have a single FIG. 44 corresponding to a fraction of the unit of the scale, whereas FIGS. 45 corresponding to another fraction of said units, for example, hundredths of units can be marked on ring 32 which also carries lines 42 serving as a reference for the fractions of FIGS. 45.
  • Disc 46 On hub 16 is mounted so as to slide freely with a certain radial play thereon a disc 46 whose rim is shaped in such a way to form a radially revolving cam 47 concentric to pin 4.
  • This disc 46 is placed in the circular surface formed by the system of prisms 39 and cam 47 is in engagement with said prisms which it acts upon radially relative to pin 4.
  • the dimensions of disc 46 are such that there is a certain play between cam 47 and prisms 39.
  • Disc 46 has a lateral'arrn 48 which is slidingly engaged in a stop member 49 integral with sleeve 7 whereby said assembly is provided to prevent rotation of disc 46 and consequently cam 47 while leaving the possibility of moving axially and radially relative to pin 4 and prisms 39.
  • the cam described is radial, i.e. it is arranged between the prisms and its active surface or contact surface with the prisms is oriented towards the same in a general direction which is perpendicular to the axis of the pin. This results in a considerable space saving in the axial direction.
  • the cam is radial and arranged between the prisms its active or contact surface with the prisms cannot move away from the same so as to permit them to rotate freely.
  • the radial cam can be made to float, i.e.
  • the radial cam can have its diameter greatly reduced which permits a further increase in the dimension of the prisms whose faces can carry larger figures facilitating the reading thereof.
  • the micrometer has a construction permitting the digital reading of units of a scale chosen to indicate the measuring range of the instrument.
  • This construction comprises mounted rotatably in sleeve 7 a tubular member 19 which is coaxial to the tubular support 5 and which is axially fixed to said sleeve 7.
  • the axial mounting and guidance of the rotation of tubular member 19 in sleeve 7 is assured by a ball race fixed to sleeve 7 and schematically represented at 20 and by a bearing 21.
  • One portion 22 of member 19 is arranged beneath a window 23 placed in the wall of sleeve 7 beside window 40 and relative to which is marked a reference line 24 (FIGS. 2 and 3).
  • FIGS. 25 (FIGS. 2 and 3) of the units of the scale chosen to indicate the measuring range of the instrument.
  • Window 23 of sleeve 7 has dimensions such that at least three of the FIGS. 25 are visible simultaneously in order to avoid ambiguities of reading during the passage from one figure to the next.
  • the periphery of portion 22 of tubular member 19 has a marking 26 (FIGS. 2 and 3) constituted by a succession of marks 27 in saw tooth fonn arranged so as to indicate the measuring range corresponding to each unit figure, i.e. all the values between 1 unit figure and the next unit figure.
  • a marking 26 (FIGS. 2 and 3) constituted by a succession of marks 27 in saw tooth fonn arranged so as to indicate the measuring range corresponding to each unit figure, i.e. all the values between 1 unit figure and the next unit figure.
  • reference 24 is adjacent to the top of saw tooth 27 corresponding to FIG. 04, which indicates that the measurement performed by the instrument is slightly below five units, i.e. one is in the four unit range or in other words four units plus a certain number of fractions of a unit.
  • the reference 26 thus facilitates the reading of the ranges corresponding to FIGS. 25.
  • tubular member 19 The inner wall of tubular member 19 is hollowed out by two diametrically opposed helical grooves 28 and 29 and whereof the pitch is equal to the measuring range of the instrument.
  • a tenon 30 which is axially and angularly fixed relative to tubular member 19, said tenons 30 being diametrically opposed and respectively fixed on an elastic ring 31 located in tubular support 5 whereby each of the tenons 30 traverse the wall of said tubular support 5 to become located respectively in the helical grooves 28 and 29.
  • sleeve 7 is axially fixed to micrometer screw 2 and follows the movements thereof whilst remaining angularly fixed.
  • tenons 30 are axially and angularly fixed and tubular member 19 is axially fixed to sleeve 7 while being angularly free because it is rotatably mounted in said sleeve 7.
  • tenons 30 are engaged in helical grooves 28 and 29 of tubular member 19. It follows that on axially displacing sleeve 7 tubular member 19 also moves axially.
  • tenons 30 are engaged in helical grooves 28 and 29 of tubular member 19 and can only permit the axial displacement of tubular member 19 when they slide along the helical grooves 28 and 29.
  • tenons 30 are fixed their sliding in the helical grooves has the effect of rotating tubular member 19 about its axis.
  • the pitch of helical grooves 28 and 29 being equal to the measuring range of the instrument, the tubular member 19 performs a complete revolution aboutits axis for a displacement of sleeve 7 and micrometer screw 2 equal to the measuring range of the instrument.
  • All the FIGS. 25 of the units of the scale chosen to indicate the measuring range of the instrument which are aligned like reference 26 in the periphery of portion 22 of tubular member 19 thus pass in front of window 23 and permit a digital reading of the units of the scale.
  • each of said indicator prisms rotatably mounted on a shaft secured to said bushing tangentially to an imaginary circle concentric to the axis of the micrometer screw;
  • a radial cam mounted under all the indicator prisms, said radial cam angularly fixed to the body and arranged therein concentrically to the axis of the micrometer screw, said radial cam engaging said prisms according to a radial direction relative to the axis of the micrometer screw, whereby said indicator prisms are rotated upon their shafts as said bushing is rotated.
  • a micrometer according to claim 1 wherein the radial cam is slidably mounted with a certain radial play on a support member coaxially connected to the micrometer screw. 3. A micrometer according to claim 1, whrein the radial cam is slidably mounted with a certain axial play on a support member coaxially connected to the micrometer screw.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length-Measuring Instruments Using Mechanical Means (AREA)
  • A Measuring Device Byusing Mechanical Method (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
US00386180A 1972-09-24 1973-08-06 Micrometer with digital reading Expired - Lifetime US3849890A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1391672A CH555038A (de) 1972-09-24 1972-09-24 Micrometre a lecture digitale.

Publications (1)

Publication Number Publication Date
US3849890A true US3849890A (en) 1974-11-26

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ID=4396451

Family Applications (1)

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US00386180A Expired - Lifetime US3849890A (en) 1972-09-24 1973-08-06 Micrometer with digital reading

Country Status (5)

Country Link
US (1) US3849890A (en, 2012)
JP (1) JPS5623081B2 (en, 2012)
CH (1) CH555038A (en, 2012)
DE (1) DE2335987C3 (en, 2012)
GB (1) GB1437540A (en, 2012)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013208662A1 (de) 2012-05-15 2013-11-21 Mitutoyo Corp. Schneller Drehantrieb für ein Hand-Mikrometer
DE102013210564A1 (de) 2012-07-03 2014-01-09 Mitutoyo Corporation Konstantkraft-Federantrieb für ein Hand-Mikrometer
DE102014216824A1 (de) 2013-09-03 2015-03-05 Mitutoyo Corporation Verfahren zum Validieren einer Werkstückmessung in einem Handmesswerkzeug zum dimensionellen Messen
DE102015224902A1 (de) 2014-12-12 2016-06-16 Mitutoyo Corporation Ergonomische Bügelmessschraube mit zwei Einstellmodi

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62202282U (en, 2012) * 1986-06-16 1987-12-23

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2900731A (en) * 1957-03-16 1959-08-25 Meyer Hans Micrometer indicator
US3474958A (en) * 1966-09-27 1969-10-28 Hans Meyer Indicating means

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2900731A (en) * 1957-03-16 1959-08-25 Meyer Hans Micrometer indicator
US3474958A (en) * 1966-09-27 1969-10-28 Hans Meyer Indicating means

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013208662A1 (de) 2012-05-15 2013-11-21 Mitutoyo Corp. Schneller Drehantrieb für ein Hand-Mikrometer
US8997369B2 (en) 2012-05-15 2015-04-07 Mitutoyo Corporation Fast rotary drive for a handheld micrometer
DE102013210564A1 (de) 2012-07-03 2014-01-09 Mitutoyo Corporation Konstantkraft-Federantrieb für ein Hand-Mikrometer
US8739428B2 (en) 2012-07-03 2014-06-03 Mitutoyo Corporation Constant force spring actuator for a handheld micrometer
DE102014216824A1 (de) 2013-09-03 2015-03-05 Mitutoyo Corporation Verfahren zum Validieren einer Werkstückmessung in einem Handmesswerkzeug zum dimensionellen Messen
US9377282B2 (en) 2013-09-03 2016-06-28 Mitutoyo Corporation Method for validating a workpiece measurement in a dimensional metrology hand tool
DE102015224902A1 (de) 2014-12-12 2016-06-16 Mitutoyo Corporation Ergonomische Bügelmessschraube mit zwei Einstellmodi
US9482509B2 (en) 2014-12-12 2016-11-01 Mitutoyo Corporation Ergonomic micrometer including two modes of adjustment

Also Published As

Publication number Publication date
JPS5623081B2 (en, 2012) 1981-05-29
GB1437540A (en) 1976-05-26
CH555038A (de) 1974-10-15
JPS4971955A (en, 2012) 1974-07-11
DE2335987A1 (de) 1974-04-18
DE2335987C3 (de) 1975-04-17
DE2335987B2 (de) 1974-08-29

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