US3340616A - Micrometer - Google Patents

Micrometer Download PDF

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Publication number
US3340616A
US3340616A US455428A US45542865A US3340616A US 3340616 A US3340616 A US 3340616A US 455428 A US455428 A US 455428A US 45542865 A US45542865 A US 45542865A US 3340616 A US3340616 A US 3340616A
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United States
Prior art keywords
sleeve
rotation
hollow body
control sleeve
micrometer
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.)
Expired - Lifetime
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US455428A
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English (en)
Inventor
Mincuzzi Antonio
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.)
Fratelli Borletti SpA
Borletti SpA
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Borletti SpA
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Publication date
Application filed by Borletti SpA filed Critical Borletti SpA
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Publication of US3340616A publication Critical patent/US3340616A/en
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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

  • the control of the counting mechanism is effected via a gear train driven by the rotary member that controls the micrometric screw of the calibrating rod.
  • the counting mechanism which is generally constituted by a series of flanged rings carrying the number on their outer surfaces, is located coaxially with the Calibrating rod, which therefore passes through the said rings.
  • This construction comprises the feature that the Calibrating rod, an extension of which is provided with the micrometric screwthread, is capable of rot-ating relative to a nut xed to the body of the micrometer, by means of a universal joint controlled by a rotatable sleeve.
  • the importance of the said universal joint, the operation of which will be described hereinafter, is
  • FIG. 1 is an external view of a micrometer according to the invention in which can be seen the counting mechanism, the circumferential micrometric graduation and the locking lever,
  • FIG. 2 is a longitudinal section, on a larger scale than FIG. 1, of the control assembly for the Calibrating rod,
  • FIG. 3 is a cross section on the line III-III of FIG. 2,
  • FIGS. 4 and 5 show a detail of the sliding joint connecting the sleeve and the Calibrating rod
  • FIG. 6 shows a detail of two shells of plastic material that cover the handle of the micrometer.
  • the body 1 of the micrometer which has a handle 2 of arcuate form, includes a cylindrical hollow body portion 3 which is located in line with an anvil 4 and in which is housed the counting mechanism 5.
  • a member 7 is rigidly fixed by means of a screwthread 6, to the portion 3 so as to form a single piece therewith.
  • the member 7 is extended at 8 by a sleeve which is screwthreaded at 9.
  • On the screwthread are Screwed two nuts 10, 10 which serve respectively as nut and locking nut which provide locating nut means.
  • a bushing 12 which is capable of turning on the outer surface 13 of the extension 8 without being able to move 3,340,616 Patented Sept. 12, 1967 ICC axially.
  • the bushing 12' is in turn rigidly xed in the nterior of a control sleeve 14 by means of screws 15, hence the sleeve 14 can rotate freely relative to the member 7, being guided by the bushing 12, without being able to slide axially.
  • an inner sleeve 18 In the inner part of the end of the sleeve 14 remote from the bushing 12 is inserted an inner sleeve 18, this being releasably locked against a shoulder 16 by means of an end cap 17.
  • the sleeve 18 has longitudinal inwardly opening groove 19 the centres of which are on a diametrical plane.
  • two diametrically opposed grooves 19 can slide the ends 20 of two pins 21 with plane parallel faces, lixed in diametrically opposite positions to a collar 22.
  • the latter is mounted, so as to be capable of slight oscillation, on the end 23 of the Calibrating rod 24 within the sleeve 14, by means of a locating pin 25 the axis of which is normal to the common axis of both said pins 2,1.
  • the assembly constituted by the collar 22, pins 21, and pin 25 forms a universal joint which can turn slightly about the pin 25 and can also undergo slight displacements in the direction of the arrow 26.
  • the rod 24 has an extension 27 with a micrometric screwthread which engages with the internal screwthread 28 in the extension 8, and which causes the Calibrating rod 24 to move along its axis, for example in the direction of the arrow 29. Displacement in the opposite sense would clearly be elfected by turning the sleeve 14 in the opposite direction.
  • the Calibrating rod is thus mounted by screwthread 2'8 and by an internal cylindrical bore of member 7, for rotation and laxial sliding movement in and relative to the hollow body.
  • the end of the extension 8 is slotted at 30 along a diametrical plane, and externally is of sli-ghtly conical shape and is screwthreaded.
  • a nut 31 is screwed onto this screwthread to the extent that some play is left between the internal screwthread 28 and the screwthreaded shank of the Calibrating rod.
  • Rotation of the sleeve 14 is transmitted by means of an internally toothed wheel 32 to a wheel 33, ya shaft 34, a wheel 35, a wheel 36 (see FIG. 3) and nally to a wheel 37 fixed to a disc 40 actuating'the counting mechanism comprising an assembly of numbered rings through a tooth 41.
  • the end of the calibrating rod 24 is brought against the anvil 4; then the cap 17 is unscrewed so that the inner sleeve 18 will be freely rotatable in the respect of the sleeve 14, and the sleeve 14 is rotated so that all numbered rings of the counting mechanism 5 Will be brought to zero, the Calibrating rod being maintained fixed.
  • the cap 17 is now locked again and the phasing of the sleeve 14 in the respect of the counting mechanism 5 is performed through the ring 38 having a graduation 46.
  • the ring 38 will be rotated on the sleeve 14 in the respect of the index 47 ixed to the body 1 and locked in the zero position through screw dowels 39.
  • the screwthreads on the end cap 17 thus constitute one means for xedly securing the cap on sleeve 14 in a position to bear against sleeve 18 and lock sleeve 1-8 against movement relative to sleeve 14.
  • the transmission ratio between the successive numbered rings 43, 44 and 45 is such that the iirst ring makes one rotation for two tenths of a millimetre of movement of the Calibrating rod, the second ring for two millimetres, the third for twenty millimetres and the fourth for two hundred millimetres.
  • the latter however can turn only through two iigures, the extent of measurement of the micrometer being -25 mm.
  • the counting mechanism is mounted in the interior of the cylindrical zone 3 after being assembled on the ringcarrier 48 which is adapted to be inserted in the cavity in the Zone 3 of the body.
  • the carrier 48 which carries both the numbered rings and the yassociated pinions is locked in this cavity by the end cover 50 which is screwed into position at 51, via a spring 52 and an interposed sleeve 48 which also serves to protect the numbers.
  • the counting mechanism is actuated by means ot one or the other of two rings 53 which draw the sleeve 14 into rotation by friction.
  • Each ring 53 has slip friction connection with control sleeve 14 to limit the torque that can be applied to sleeve 14 by a ring 53.
  • This sleeve in turn operates via the grooves 19 and the pins 21 to effect rotation of the calibrating rod 27-24 which, screwing at 2S, is caused to move axially until it engages the object to be measured, the object being placed between the anvil 4 and the end of the calibrating rod 24.
  • the pressure with which the calibr-ating rod engages the object to be measured depends on the value of the couple that the friction of the two rings 53 is able to transmit to the sleeve 14. This pressure or measuring load is preferably of the order of 1 kg.
  • a pin 55 can be shifted axially to lock the relatively rotatable bushing 12 by pressure on its surface, thus enabling the relevant reading to be made without error.
  • the handle 2 is protected by two shells 56 and 57, preferably made from plastic material, which are forced onto the curved part of the body, causing at least one projection 58 on one shell to enter a corresponding recess in the opposing shell.
  • a counter micrometer comprising a hollow body, a calibrating rod, means mounting the calibrating rod for rotation and axial sliding movement in and relative to the hollow body, a control sleeve mounted for rotation on the hollow body, counting mechanism disposed in the hollow body and adapted to be actuated by rotation of said control sleeve, means defining on the inner side of said control sleeve an inwardly opening groove that extends longitudinally of the control sleeve, a member extending into said groove and slidable longitudinally of said groove, and means interconnecting said member Iand said calibrating rod for conjoint rotation and for swinging movement of said calibrating rod and said member relative to each other.
  • said means dening said groove comprising an inner sleeve disposed within said control sleeve, said inner sleeve having two diametrically opposed said longitudinal grooves, and said member having two diametrically opposite projecting pins engaging in said grooves.
  • a counter micrometer as claimed in claim 1, said means dening said groove comprising an inner sleeve mounted in said control sleeve for rotation of said inner sleeve and said control sleeve relative to each other about the axis of said sleeves, and means for releasably securing said inner sleeve in fixed position relative to said control sleeve thereby accurately to set the micrometer,
  • said releasably securing means comprising an end cap removable to expose said inner sleeve, and means for xedly securing said cap on said control sleeve in a position to bear against said inner sleeve and lock said inner sleeve against movement relative to said control sleeve.
  • a counter micrometer comprising a hollow body, a calibrating rod, means mounting the calibrating rod for rotation and axial sliding movement in and relative to the hollow body, a control sleeve mounted for rotation on the hollow body, counting mechanism disposed in the hollow body and adapted to be actuated by rotation of said control sleeve, a ring mounted for rotation on and relative to said control sleeve, said ring having graduations thereon registrable with a xed mark on said hollow body, means for selectively locking said ring on said control sleeve thereby accurately to set the micrometer, a bushing disposed within and fixed to the control sleeve, and locating nut means screw-threadedly carried by said hollow body, said bushing being disposed between said nut means and an annular shoulder on said body and serving to guide the rotation of the control sleeve without play.
  • a counter micrometer comprising a hollow body, a calibrating rod, means mounting the calibrating rod for rotation and axial sliding movement in and relative to the hollow body, a control sleeve mounted for rotation on the hollow body, counting mechanism disposed in the hollow body and adapted to be actuated by rotation of said control sleeve, a ring mounted for rotation on and relative to said control sleeve, said ring having graduations thereon registrable with a -iixed mar-k on said hollow body, means for selectively locking said ring on said control sleeve thereby accurately to set the micrometer, and a handle on said hollow body, a pair of shells of plastic material disposed on opposite sides of said handle, and a projection on one said shell extending into a recess in the other said shell thereby to hold the shells together on opposite sides of the handle.
  • a counter micrometer comprising a hollow body, a calibrating rod, means mounting the calibrating rod for rotation and axial sliding movement in and relative to the hollow body, a control sleeve mounted for rotation on the hollow body, counting mechanism disposed in the hollow body and adapted to be actuated by rotation of said control sleeve, la.
  • ring mounted for rotation on and relative to said control sleeve, said ring having graduations thereon registrable With a lixed mark on said hollow body, means for selectively locking said ring on said control sleeve thereby accurately to set the micrometer, and locking means comprising an eccentric member mounted for rotation on the hollow body and having means adapted to engage between a xed part and a rotatable part of the micrometer thereby to tix said parts releasably together to enable a correct reading to be made.

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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)
US455428A 1964-05-13 1965-05-13 Micrometer Expired - Lifetime US3340616A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT1044464 1964-05-13

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US3340616A true US3340616A (en) 1967-09-12

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US455428A Expired - Lifetime US3340616A (en) 1964-05-13 1965-05-13 Micrometer

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CH (1) CH410446A (it)
GB (1) GB1081775A (it)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4718555U (it) * 1971-04-02 1972-11-01
JPS4736262U (it) * 1971-05-11 1972-12-22
JPS4954459U (it) * 1972-08-16 1974-05-14
JPS4973444U (it) * 1972-10-06 1974-06-26
JPS4973445U (it) * 1972-10-06 1974-06-26
JPS5046132U (it) * 1973-08-25 1975-05-08
JPS5111404Y1 (it) * 1970-11-10 1976-03-27
US3971137A (en) * 1972-12-15 1976-07-27 Francisco Martin Martin System for millesimal measure
US4419824A (en) * 1981-08-11 1983-12-13 Dr. Johannes Heidenhain Gmbh Digital electrical length measuring instrument
US6243965B1 (en) * 1998-07-17 2001-06-12 Brown & Sharpe Tesa Sa Electronic micrometer

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US756461A (en) * 1904-01-02 1904-04-05 Theodore L Provost Micrometer-calipers.
US1107202A (en) * 1913-05-19 1914-08-11 Edward S Savage Micrometer-caliper.
US1389028A (en) * 1920-03-04 1921-08-30 Albert L Colburn Direct-reading micrometer-caliper
US1638366A (en) * 1924-02-11 1927-08-09 Sandoz Henry Micrometer
US2957248A (en) * 1958-06-09 1960-10-25 Central Tool Company Micrometer thimble adjustment
US3120061A (en) * 1959-06-11 1964-02-04 Pfleiderer Karl Counter-micrometer

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US756461A (en) * 1904-01-02 1904-04-05 Theodore L Provost Micrometer-calipers.
US1107202A (en) * 1913-05-19 1914-08-11 Edward S Savage Micrometer-caliper.
US1389028A (en) * 1920-03-04 1921-08-30 Albert L Colburn Direct-reading micrometer-caliper
US1638366A (en) * 1924-02-11 1927-08-09 Sandoz Henry Micrometer
US2957248A (en) * 1958-06-09 1960-10-25 Central Tool Company Micrometer thimble adjustment
US3120061A (en) * 1959-06-11 1964-02-04 Pfleiderer Karl Counter-micrometer

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5111404Y1 (it) * 1970-11-10 1976-03-27
JPS4718555U (it) * 1971-04-02 1972-11-01
JPS4736262U (it) * 1971-05-11 1972-12-22
US3758956A (en) * 1971-05-11 1973-09-18 Yehan Numata Micrometer comprising a digital counter
JPS4954459U (it) * 1972-08-16 1974-05-14
JPS4973444U (it) * 1972-10-06 1974-06-26
JPS4973445U (it) * 1972-10-06 1974-06-26
US3971137A (en) * 1972-12-15 1976-07-27 Francisco Martin Martin System for millesimal measure
JPS5046132U (it) * 1973-08-25 1975-05-08
US4419824A (en) * 1981-08-11 1983-12-13 Dr. Johannes Heidenhain Gmbh Digital electrical length measuring instrument
US6243965B1 (en) * 1998-07-17 2001-06-12 Brown & Sharpe Tesa Sa Electronic micrometer

Also Published As

Publication number Publication date
GB1081775A (en) 1967-08-31
CH410446A (it) 1966-03-31

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