US3781998A - Inside micrometer comprising a counter - Google Patents

Inside micrometer comprising a counter Download PDF

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Publication number
US3781998A
US3781998A US00222566A US3781998DA US3781998A US 3781998 A US3781998 A US 3781998A US 00222566 A US00222566 A US 00222566A US 3781998D A US3781998D A US 3781998DA US 3781998 A US3781998 A US 3781998A
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US
United States
Prior art keywords
spindle
counter
scale
carrying
ring
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
Application number
US00222566A
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English (en)
Inventor
K Okazaki
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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 Compact inside micrometer comprising counter directly or indirectly connected to a guide which operates scale-carrying rings in the counter through a connecting bush interlocked with a spindle.
  • the counter may be adjusted by separating the connecting bush from the guide.
  • the present invention relates to an inside micrometer comprising a counter.
  • Another object of the present invention is to provide such a micrometer in which the rotational force of a spindle is transmitted through intermediate means to a scale-carrying ring forming part of the counter which ring is mounted coaxially around the spindle for the sake of compactness.
  • a further object of the present invention is to provide a micrometer in which the rotation ratio between the spindle and the counter may be set at a desired value by using a set of gears which change the speed of the said intermediate means.
  • FIG. I is a side view of my new micrometer comprising a counter means, with half of its external parts broken away;
  • FIG. 2 is a sectional view taken along the line IIIl of FIG. 1;
  • FIG. 3 is a sectional view taken along the line lIl--III of FIG. 1, and
  • FIG. 4 is a side view, partially in section, of another embodiment of the present invention.
  • the structure in the right half of FIG. 1 is the same as that of an ordinary inside micrometer.
  • the externally threaded portion S of a spindle 2 is engaged in the internally threaded part 3" of the internal sleeve 3 and a thimble 4 is attached to the end of the spindle 2 by a screw 16.
  • One end of this thimble carries indicia used in measuring.
  • Reference numeral 5 indicates an outer sleeve rigidly attached to the cylindrical periphery of the internal sleeve 3.
  • the outer surface of this sleeve carries a base line for measurement, which cooperates with the scale on the thimble.
  • the spindle 2 is formed with a longitudinal groove which receives a key in the form of a screw 19, hereinafter described in greater detail.
  • An outer body member 1 carries at one end a cover 6 rigidly attached thereto by a cap 10.
  • An adjustable stop 14 is screwed into the cover 6 and held tightly in place by a nut 9.
  • Counter means 8 encircles the cylindrical surface of the spindle 2, and is rigidly attached to the cover 6 by a pin 13 which prevents rotation of the counter means 8.
  • the casing of the counter means 8 is substantially cylindrical in form, and carries four rotatable counter scale rings 8,, 8 '8 8 These rings are mounted coaxially of the spindle 2.
  • scale ring 8 which is a first stage ring and denotes a number having one digit, is rotated for one revolution by the guide ring 12, then the next stage ring 8 is so rotated by the driving gear 31 that it turns through a predetermined angle, and the third and fourth scale rings are rotated in their turns in a similar manner.
  • the connecting bush 7 loosely mounted on the spindle 2 rotates therewith due to the presence of the tip of the key 19 in the groove 2'.
  • Reference numeral 20 indicates a stop screw for the key 19.
  • a guide ring 12 is rigidly mounted on the connecting bush 7 and rotates the scale rings.
  • the connecting bush acts through a ring-shaped guide bush 11 to which it is connected by a set screw 25.
  • Access to this set screw 25 may be attained by removing a screw 18 which is set in the outer body 1 as shown in FIG. 3.
  • the guide bush 11 and the guide'ring 12 are freed to rotate around and against the connecting bush 7, thus making it possible to regulate the zero point of the counter.
  • access to the set screw 19 and the set screw 20 is attained by removing a screw 21, thus permitting adjustment of the engagement between the set screw 19 and the key 2'.
  • the guide ring 12 is connected to the scale ring so as to move therewith. Therefore, operation of the thimble 4 moves the spindle 2 to the right in FIG. 1.
  • connection bush 7 rotates at a predetermined position while interlocked with the spindle 2 by the key screw 19 and the key groove 2'.
  • This rotating movement is transmitted to the first stage scale ring 8 in the counter means by the guide ring 12, and then to the other scale rings in the counter in their turn.
  • the change in the figures on the counter is read through a window 24 in the body 1, and vernier measurement is carried out by using the thimble scale jointly at the same time.
  • reference numeral 22 indicates a clamp screw for the spindle and reference numeral 23 a bush receiving the screw 22.
  • the second embodiment is shown in FIG. 4. While in the first embodiment the spindle and the counter rotate in a ratio of one to one, in the second embodiment they rotate in a ratio of l to 2.5. To this end, speed increasing gear means is provided.
  • a ring gear 30 is fastened to the bush 7' by a screw 25. Access to this gear is easily attained by removing a screw (not shown in the drawings) in the outer body 1.
  • the ring gear 30 meshes with a pinion 29 which is rotatably mounted on a shaft 28 supported by the side wall forming part of the outer body 1, and the pinion 27 rotatably mounted on the same shaft 28 is in engagement with a gear 26 which is rotatably mounted on the spindle 2.
  • the guide ring 12 is attached to the gear 26 to rotate therewith. Therefore, rotation of the spindle 2 turns a connecting bush 7', an initial gear 30, the pinions 29, 27, the gear 26, and the guide ring 12 to change the figures in the counter, and the figures are read through a window 24.
  • the zero point of the counter means may be adjusted, and the position of the connecting bush on the spindle may be adjusted.
  • the counter means encircles the spindle, its structure is compact, like that of the inside micrometer.
  • an inside micrometer comprising an externally threaded spindle which is longitudinally advanced by relative rotation between said spindle and a concentric sleeve having internal threads engaging said external threads in said spindle, a thimble for causing such relative rotation and a digital counter comprising a plurality of scale-carrying rings encircling said spindle which indicate the distance through which said relative movement occurs, the improvement according to which the motion of said spindle is transmitted to said counter through a transmission comprising:

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length-Measuring Instruments Using Mechanical Means (AREA)
  • Indicating Measured Values (AREA)
  • A Measuring Device Byusing Mechanical Method (AREA)
US00222566A 1971-04-02 1972-02-01 Inside micrometer comprising a counter Expired - Lifetime US3781998A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1971024882U JPS4718555U (de) 1971-04-02 1971-04-02

Publications (1)

Publication Number Publication Date
US3781998A true US3781998A (en) 1974-01-01

Family

ID=12150545

Family Applications (1)

Application Number Title Priority Date Filing Date
US00222566A Expired - Lifetime US3781998A (en) 1971-04-02 1972-02-01 Inside micrometer comprising a counter

Country Status (4)

Country Link
US (1) US3781998A (de)
JP (1) JPS4718555U (de)
CH (1) CH530620A (de)
GB (1) GB1336548A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD338415S (en) 1989-10-24 1993-08-17 Schnyder & Cie S.A. Instrument for measuring size
US20030121169A1 (en) * 2001-12-28 2003-07-03 Mitutoyo Corporation Measuring device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US981127A (en) * 1909-03-31 1911-01-10 Lino Scusa Micrometer-gage.
US2691224A (en) * 1953-08-20 1954-10-12 Thielieke Ernst Direct reading micrometer
US3667127A (en) * 1970-06-04 1972-06-06 Taisuke Tsugami Digital micrometer caliper

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH410446A (it) * 1964-05-13 1966-03-31 Borletti Spa Micrometro con numeratore

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US981127A (en) * 1909-03-31 1911-01-10 Lino Scusa Micrometer-gage.
US2691224A (en) * 1953-08-20 1954-10-12 Thielieke Ernst Direct reading micrometer
US3667127A (en) * 1970-06-04 1972-06-06 Taisuke Tsugami Digital micrometer caliper

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD338415S (en) 1989-10-24 1993-08-17 Schnyder & Cie S.A. Instrument for measuring size
US20030121169A1 (en) * 2001-12-28 2003-07-03 Mitutoyo Corporation Measuring device
US7013576B2 (en) * 2001-12-28 2006-03-21 Mitutoyo Corporation Measuring device using multi-start threaded spindle

Also Published As

Publication number Publication date
CH530620A (de) 1972-11-15
GB1336548A (en) 1973-11-07
JPS4718555U (de) 1972-11-01

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