US2521428A - V-block attachment for micrometers - Google Patents

Description

Sept. 5, 1950 B. vlzuE-rE 2,521,428

V-BLOCK ATTACHMENT FOR MICROMETERS Filed Oct. l, 1945 j By 4 /7 afm/#wey M@ Patented Sept. 5, 1950 UNirEso stares PATENT f office V-BLO CK ATTACHMENT FOR MICROMETERS Bennie Vizuete, Port Arthur, Tex.

Application October 1, 1945, Serial'No. 619,559

1 Y My invention presented 'herewith comprehends an improved micrometer, the primary object of which is to provi-de suc-h an instrument -with which accurate measurements fcan be made .on tools .such as reamers having -an odd number of ribs or cutters. l

Another object o-f this invention is to provide a micrometer with; which acicurate readings 'ci work involving three surface points or odd multiples thereof may be made.

.A further object of the 'invention is to provide a'micrometer having a V-block hingedlywpnnected thereto.

A still further object of my invention is to provide a micrometer so constructed and graduated as to give diameter of work inA its reading without calculation.

Other features and advantages will become more readily apparent from the following description and the accompanying illustrative drawings in which:

Figure 1 is an elevational view of my micrometer,

Figure 2 is a longitudinal sectional view thereof shown partly broken off,

Figure 3 is a detail sectional View illustrating the mounting of a V-block,

Figure 4 is a detail sectional view of a collet nut, and

Figure 5 is a plan view thereof.

Due to the fact that a machinist cannot obtain a correct size of work involving odd cutter teeth, grooves, etc., with present micrometers Without great dilculty and the use of independent V- blocks and without calculation, I have evolved the instant device whereby much time may be saved and whereby such work as that of finish grinding reamers and the like may be accom- 1 Claim. (01.33-167?) plished in less time and by less experienced mechanics.

My micrometer I0, consists of a C-member II, having right-angular spaced apart aligning heavy arms I2 and I3, the former terminating in an enlarged internally screw-threaded cylinder I4, into lwhich is threaded the solid externally threaded end I5, of a tubular internally threaded sleeve I6. Threaded into the sleeve I6, is the enlarged upper end I'I, of a gauging spindle I8, which passes slidably through the bore I9, in said end I5.

Rotatably seated upon the upper end of the sleeve I6, is an actuating sleeve 2l, having a knurled portion 22, and a beveled lower edge, which is scaled. as indicated at 23, and is also provided with another scale 25, just above the bevel. The upper terminal 26, ci member 2l, is provided with accn-icbore 2l, -into which proiects'the conic reduced head 218, of the -salid end 17,' of mem-ber |38. 'The extreme terminal 29, of member 2 I, is fan-nularly rabbeted as at 30, to form a seat for the annular iiarrge BI, of a eapf82. Countersunk in the'center of the cap rand "fined thereto is the head v33, of a depending screw 34, which'is threaded intc'the said conic member "28., whereby the member I1, will rotate with sleeve 21, for raising or lowering its `spindle H, for adjustment upon a piece iof work.

Mounted lon the 'spindle 18, 1is a collet nut 3.5, having a knurled harige 36, and `a con-ic split tubular portion 3T, threaded into the similarly formed threaded bore 38, in the bottom end, of the member I5. A knurled nut 40, is threaded upon the threaded end 4I, of said member I5, between which and the said ange 3B, is seated a washer 42. The purpose of the collet nut and its connections is to be able to xedly secure the spindle I8, in an adjusted position.

The arm I3, is bifurcated to receive the hinge member 43, between the parts 44 and 45, of said arm, said member being a downwardly projecting tongue of a V-block or anvil 46, which may be swung over the end 4I of member 43, when not to be used. Projecting through slot 48, in part 45, is a pintle 49, of abearing 50. Between the head 5I, and the wall 52 of part 45, is an enlarged disk like part 52', thereof. A reduced central portion 53, of the pintle forms the bearing for the bore 54, of said hinge member 43. The still further reduced part 55, of the pintle extends through the slot 56, of part 44, of arm I3. The extreme terminal 51, of the pintle is threaded to receive a nut 58, bearing against wall 59, of said part 44, and which with the disk or ange 52', forms a clamp to hold the V-block in xed position. The pintle 49, may be moved along the slots 43 and `56, to permit the V-block 46, to pass over the rounded portions 60, of said end 4l.

The outer surface 6I of sleeve I6, is provided with a vertically disposed scale 62, correlative to scales 23 and 25, through which correct readings may be taken directly from the instrument.V 63, is a hand grip.

Great diiculty is experienced by a machinist, when for example, he has to finish grinding a reamer having an odd number of teeth or utes so that he cannot obtain a size with a regular micrometer because the flutes do not fall diametrically opposite each other. In some cases of this kind, a ring is bored out to the desired dimension and the reamer is ground till the ring fits on over the flutes.

I have developed a micrometer for taking readings of Work that involves three surface points or odd multiples of three (9-15, etc.). Taking such readings with a standard micrometer is not possible unless an accurate V-block is available and then the machinist must make necessary calculations to obtain desired reading.

My design utilizes the V-block principle, and the spindle is provided with the correct number of threads per inch to give a true reading directly from the instrument. It utilizes a 60 V-block which is hinged in place in order to accommodate large Work without excessive opening of the instrument. The spindle is threaded with 262/3 threads per inch which is the number necessary in this case to give a correct reading.

It is thought that persons skilled in the art to which the invention relates will be able to obtain a clear understanding of the invention' after considering the description in connection with the drawings. Therefore, a more lengthy description is regarded as unnecessary.

. Changes in shape, size and rearrangement of details and parts such as come within the purview of the invention claimed may be resorted to, in actual practice, if desired.

Having now described my invention, that Which I claim as new and desire to procure by Letters Patent is:

Attachment means for a V-block on one arm of a micrometer gauge, comprising a bifurcated portion in said arm having similar parallel flat Vplate parts, the corners of said plate parts remote from said one arm being rounded, opposed slots in said parts extending longitudinally of the arm, a tongue on said V-block receivable between said parts and having a transverse aperture, a pintle extending through the slots in said parts and through said aperture, said -pintle having one end threaded into a nut on one side of the arm and having a head abutting the other side of said arm,` whereby the V-block is selectively secured to the arm in operative and inoperative positions.

BENNIE VIZUETE.

REFERENCES CITED The following references are of record in the file of this patent:

-UNITED STATES PATENTS Number Name Date 279,038 Stillman June 5, 1883 570,189 Stromberg Oct. 27, 1896 647,910 Starrett Apr. 17, 1900 1,174,052 Burdick Mar. 7, 1916 1,241,160 Starrett Sept. 25, 1917 1,388,740 Miller Aug. 23, 1921 1,570,831 Hanson Jan. 26,- 1926 1,679,189 Wadell July 31, 1928 FOREIGN PATENTS Number Country Date 36,936 France May 20, 1930 335,845 Germany Apr. 13, 1921 413,084 Great Britain July 12, 1934

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