US3758956A - Micrometer comprising a digital counter - Google Patents

Micrometer comprising a digital counter Download PDF

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Publication number
US3758956A
US3758956A US00249277A US3758956DA US3758956A US 3758956 A US3758956 A US 3758956A US 00249277 A US00249277 A US 00249277A US 3758956D A US3758956D A US 3758956DA US 3758956 A US3758956 A US 3758956A
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US
United States
Prior art keywords
micrometer
spindle
counter
feeler
rotatable
Prior art date
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Expired - Lifetime
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US00249277A
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English (en)
Inventor
K Nakata
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.)
YEHAN NUMATA
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YEHAN NUMATA
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Filing date
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

  • ABSTRACT Micrometer comprises a spindle which is axially advanced by rotating a knob or ring and a digital indicating counter actuated in response to movement of said spindle and seated in the guide for said spindle.
  • the micrometer comprises means for adjusting the counter and means for taking up any play between the spindle and spindle guide.
  • This invention relates to a micrometer comprising a digital counter which indicates in large numerals the value measured by the micrometer, which value is also indicated by a scale on the micrometer spindle.
  • FIG. 1 is a side view, partially in axial section, showing one embodiment of the micrometer according to the invention.
  • FIG. 2 is a sectional view, taken along the line ll-ll of FIG. 1.
  • reference numeral 34 indicates a knob fixed to a screw 34A, screwed into the internally threaded part 8A of a hollow spindle 8.
  • the left end of the screw 34A has left-handed threads, so that the.knob and spindle turn as an integral unit.
  • a collar 27 encircles the end of the part 8A of the spindle and is rigidly connected to the part 8A so as to rotate therewith.
  • a eap 29 is gripped between the collar 27 and knob 34.
  • a nut 23 having an inwardly projecting flange 23A and a nut 28 covered by the cap 29.
  • a plurality of balls 24 are seated in an annular groove in the member 20, which forms part of the main stationary body of the micrometer.
  • the flange 23A engages one side of these balls, while the ring 25, on the other side of these balls is spaced from the collar 27 by the spring 26. It will be appreciated that this arrangement permits the spindle 8 and collar 27 to rotate freely with respect to the body 20, while the action of the spring prevents any relative axial movement therebetween, since the flange 23A and 25 act as jaws gripping the balls to prevent such axial movement.
  • a knurled ring 41 is held on the nut 23 by a set screw 30, so that the nut 23, collar 27 and spindle 8 may be rotated by the ring 41.
  • the ring 41 comprises a ring gear 22, the internally projecting teeth of which engage a pinion 21 mounted on a shaft 19 journalled in the body part 20. Rotation of the ring 41 thus turns the pinion 21, the shaft 19, and the pinion 18 at the other end of the shaft 19.
  • the pinion l8 drives a gear 16, rotatably mounted on the part 83 of the spindle 8.
  • the gear 16 is integral with member which drives the first wheel 40A of a counter 40.
  • the subsequent wheels 40B, 40C, and 40D of this counter are driven successively in a conventional manner, with each wheel being turned through one-tenth of a revolution each time the preceding wheel completes a full revolution.
  • a window 42, through which the numbers on the wheels may be viewed, is provided in the main body 1 of the micrometer.
  • An auxiliary or vernier scale may be attached to the ring gear 22 and cooperate with an index on the main body.
  • the left end of the spindle 8 is externally threaded and encircled by a sleeve 6 fixed to the feeler 2.
  • the feeler 2 is provided with a longitudinal external groove which receives the end of a key screw seated in the main body. The arrangement is such that rotation of the spindle 8 causes the feeler 2 to slide axially in the main body, since relative rotation therebetween is prevented by engagement of the tip of the keyscrew 32 in the longitudinal groove in the feeler 2.
  • Rotation of the spindle is produced by rotation of either the knob 34 or the knurled ring 41, and such rotation results in corresponding rotation of the wheels of the counter, as previously described.
  • the screw 30 is loosened. This permits the nut 23 and ring gear 22 to be rotated about the spindle 8, while driving the counter wheels through the gears 22, 19 and 20, until the desired relative position is attained. The set screw 30 may then be tightened again.
  • a micrometer comprising a main body (20), an elongated feeler (2) axially slidable within said body, elongated rotatable means (34, 8, 23, 27, 28, 29) for axially sliding said feeler with respect to said body, and a counter (40) connected to indicate changes in the position of said feeler relative to said body, the improvement which comprises:
  • resilient means biassing said rotable means to a constant longitudinal position relative to said main body
  • a gear (22) carried by said rotatable means and connected to drive said counter when there is relative movement between said rotatable means and said main body
  • a micrometer as claimed in claim 1 comprising ball bearing means (24) seated in said body and jaws (23A, 25) carried by said body and gripping said bearing means, one of said jaws (25) being movable longitudinally of said rotatable means and biassed toward said bearing means by said resilient means.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length-Measuring Instruments Using Mechanical Means (AREA)
US00249277A 1971-05-11 1972-05-01 Micrometer comprising a digital counter Expired - Lifetime US3758956A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1971037649U JPS4736262U (es) 1971-05-11 1971-05-11

Publications (1)

Publication Number Publication Date
US3758956A true US3758956A (en) 1973-09-18

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ID=12503484

Family Applications (1)

Application Number Title Priority Date Filing Date
US00249277A Expired - Lifetime US3758956A (en) 1971-05-11 1972-05-01 Micrometer comprising a digital counter

Country Status (5)

Country Link
US (1) US3758956A (es)
JP (1) JPS4736262U (es)
CH (1) CH530619A (es)
DE (1) DE2205405C3 (es)
GB (1) GB1385761A (es)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0947801A2 (en) * 1998-04-03 1999-10-06 Mitutoyo Corporation Micrometer
US6247244B1 (en) * 1998-07-16 2001-06-19 Brown & Sharpe Tesa Sa Device for longitudinal measurement
US6308433B1 (en) * 1998-11-11 2001-10-30 Mitutoyo Corporation Micrometer that holds displayed displacement when retraction amount is less than a set amount
US20070214675A1 (en) * 2004-09-28 2007-09-20 Hansjorg Weissinger Micrometer screw gauge with non-rotating measuring screw

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1163737B (it) * 1979-11-29 1987-04-08 Oronzio De Nora Impianti Elettrolizzatore bipolare comprendente mezzi per generare la ricircolazione interna dell'elettrolita e procedimento di elettrolisi
US4550507A (en) * 1982-12-15 1985-11-05 Mitutoyo Mfg. Co., Ltd. Thread construction in length measuring instrument and method for manufacturing thread construction
US8997369B2 (en) * 2012-05-15 2015-04-07 Mitutoyo Corporation Fast rotary drive for a handheld micrometer
JP7208717B2 (ja) * 2018-04-20 2023-01-19 株式会社ミツトヨ 小型測定器およびその制御方法
CN113970279B (zh) * 2021-10-26 2023-07-07 珠海城市职业技术学院 数字式螺旋测微仪

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB190920771A (en) * 1909-09-11 1910-04-14 Frederic William Russell Improvements in Micrometer Gauges.
US3120061A (en) * 1959-06-11 1964-02-04 Pfleiderer Karl Counter-micrometer
US3340616A (en) * 1964-05-13 1967-09-12 Borletti Spa Micrometer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB190920771A (en) * 1909-09-11 1910-04-14 Frederic William Russell Improvements in Micrometer Gauges.
US3120061A (en) * 1959-06-11 1964-02-04 Pfleiderer Karl Counter-micrometer
US3340616A (en) * 1964-05-13 1967-09-12 Borletti Spa Micrometer

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0947801A2 (en) * 1998-04-03 1999-10-06 Mitutoyo Corporation Micrometer
EP0947801A3 (en) * 1998-04-03 2001-09-05 Mitutoyo Corporation Micrometer
US6247244B1 (en) * 1998-07-16 2001-06-19 Brown & Sharpe Tesa Sa Device for longitudinal measurement
US6308433B1 (en) * 1998-11-11 2001-10-30 Mitutoyo Corporation Micrometer that holds displayed displacement when retraction amount is less than a set amount
US20070214675A1 (en) * 2004-09-28 2007-09-20 Hansjorg Weissinger Micrometer screw gauge with non-rotating measuring screw
US7484314B2 (en) * 2004-09-28 2009-02-03 Carl Mahr Holding Gmbh Micrometer screw gauge with non-rotating measuring screw

Also Published As

Publication number Publication date
DE2205405C3 (de) 1974-01-03
JPS4736262U (es) 1972-12-22
DE2205405B2 (de) 1973-06-07
DE2205405A1 (de) 1972-11-23
CH530619A (de) 1972-11-15
GB1385761A (en) 1975-02-26

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