US835224A

US835224A - Micrometer.

Info

Publication number: US835224A
Application number: US29184605A
Authority: US
Inventors: Day K Lee
Original assignee: Individual
Current assignee: Individual
Priority date: 1905-12-15
Filing date: 1905-12-15
Publication date: 1906-11-06
Anticipated expiration: 1923-11-06

Description

11.15;. 153 5 f u i PATENTED NOV. 6, 1906.

D. K. LEE.

MICROMETBR.

APPLICATION FILED D3015. 1905.

. .i lliiizlilllu LIiE i INVENTOR WITNESSES:

2 3 "1:10AM" co.. Iunmcm. u c.

To all 11:7: 0m it may concern..-

Be it known that 1, DAY K. LEE, a citizen of the United States, residing at Athens, in the county of Bradford and State of Pennsylvania, have invented certain new and useful Improvements in .\licrometers, of which'the following is a specification.

This invention relates to improvements in micrometer-gages for inside calipering; and my object is to provide a micrometer which shall be adapted to measuring small diameters and which maybe readily and accuratclv adjusted for measuring larger or smaller diameters within its range.

A further object is to provide a micrometer of this type which will be simple in construction and which may be manufactured at a small cost and yet be accurate in its measurements.

I attain my object by constructing the micrometer in the manner illustrated in the accompanying drawings, in which Figure 1 represents a side elevation of I11; improved micrometer; Fig. ".2, a plan view thereof; Fig. 3, a partial side elevation showing the device for adjusting the micrometerpin, and F 4 a plan view of Fig) 3.

Like letters o reference designate like parts in the several views.

The stock or handle A of the micrometer is given the form illustrated in Figs. 1 and 2 and is provided at the outer end with a clamping-jaw lll'fl) which is screwed an adjustable pin B, the inner end of said pin being adjustable along the scale C, formed on the stock of the micrometer below the threaded jaws. The stock is longitudinally slotted on the under side, and in this slot is ivoted an arm D by means of the pivot-pin E The outer end of this arm is provided with a caliper-point at F, which stands in line with the axis of the pin B, and the inner end of the arm D is engaged by an adjustingsorew G, which is rotated to adjust the arm by means of a graduated thumb-wheel H. the adjustment of which wheel is ascertained by the position of its upper surface and its gleduations with reference to the index-finger l, which rises from the stock A. The arm D is held in engagement with the adjusting-screw b T means of a spring J which straddles tie handle portion of the stock A and is fastened thereto and held in place by a pair of pins, as shown in F ig. 1.

The pivotal point E of the arm D is set ata.

Specification of Letters Patent.

. inn .sTATns nirnv" oFF oE.

MICROMETER.

Patented Nov. 6, 1906.

Application filed December 15,1905. Serial No. 291,846.

distancefrom the bearing-point of the adjusting screwG equal to two and one-half times the distance from the pivotal point to the caliper-point F. l 11 other words, the micrometer-arm is divided by its pivotal point in the raio of two and one-half to one. The threads on the adjusting-screw G in theinst-rument herein illustrated are cut to a pitch of forty to the inch, so that one complete rotation of the screw to the right or left will cause the inner end of the arm D to move outwardly or inwardly to the extent of onefortieth of an inch, and consequently there will be transmitted to the caliper-point F a movement in a relatively opposite direction of one one-hundredth of an inch. The face of the thumb-wheel H is divided into ten equal parts by suitable graduating-marks, one of said graduations being marked O and the others being marked from 1 to .9, or, if desired, only the graduation diametrically opposite the zero-point, which is 5 on the scale, need be marked. hen the caliperpoint F is in its mid-position, the upper surface of the thumb-wheel H level with the top of the index-finger I and the zero-point on the thumb-wheel will register with said index. If nowthe thu1nb wheel is turned one'point to the right or left, it will be understood that the caliper-point F will be moved correspondingly toward or away from the pin B to the extent of onetenth of one one-hundredth of an inch, or one one-thousandth of an inch. Therefore if the pin B be of such a length that its oint will lie exactly one inch from the point F when the arm D is in its mid-position then inside diameters of an inch, more or less, maybe measured accurately to the one onethousandth of an inch by turning the thumbwheel H in one direction or the other and noting the position of its graduations with reference to the index I. If the thumbwheel is turned to the right, its upper surface will fall below the top of the indexIand will indicate that the caliper-point F is moving toward the pin B, and therefore measuring a diameter less than one inch. If, on the other hand, the thumb-wheel be turned to the left, its u per surface will rise above the index' I and will indicate a caliper of more than one inch.

If the )in B is of such a length that its point wilf stand one inch from the caliperpoint F when its inner end registers with the will stand ona zero-mark on the scale C-that is to say, the I order to produce adjustments of one onegraduation which lies nearest the point F then by screwing said pin outwardly its point may be moved outwardly a distance equal to one-fourth of an inch, as the s ale C is shown on the micrometer as herein illustrated, and the range of the micrometer with such a pin will be from oneinch up to one and one-fourth inches, with additional one one-thousandths of an inch equal to the amount of adj ust-ment permissible at the point F. In theinstrument ierein shown the th' .b-wheel H may be rotated two and one-half revolitions in either direction, and therefore the caliper-point F may be moved toward or away from the pin B a distance equal to one-fortieth of an inch in either direction. By supplying the instrument with pins B of different lengths, each pin in a set being two-tenths of an inch onger than the next shorter pin, the micrometer may be set for calipering diameters from five-eighths of an inch or less upward.

To adjust the pin B, I provide a removable graduated disk L, which is adapted to he slipped upon the pin B, said pin having a flattened side, so that the disk may be placed in turning engagement therewith. If the threads on the pin B are cut to a pitch of forty to the inch, then the graduations on the disk L will run from zero to 25, and the rotation of the disk in one di ection or the other one point will cause the pin to be moved inwardly or outwardly one one-thousandths of an inch. For quick adjustment, however, the scale C may be used, the movement of the inner end of the pin along said scale indicating an extension or contraction of onefortieth of an inch for each point on the scale. For the purpose of setting the disk L, I provide an index-finger M, which is pivoted to the side of the stock A so as to be thrown down out of the way after the pin has been adjusted, as shown in Fig. 1 of the drawings.

Instead of using the form of spring J illustrated in Fig. '1 for holding the arm D against the end of the adjusting-screw G, I

- may provide a coiled spring, as shown at K place, or I in Fig. 3, said spring bearing against the outer end of the arm D and being completely concealed by the stock A when said arm is in may use both the spring J and the spring K in order to produce a pressure upon the arm I) which will always insure its engagement with the adjusting-screw G, and consequently a perfect adjustment of the micrometer.

It will of course be understood that the different parts of my micrometer may be differently proportioned one to another and that the thread pitches on the adjustingscrew and caliper-pin may be other than forty to the inch, in which case the graduations on the thumb-wheel and adjusting-disk will be made to correspond to such pitch in thousandth of an inch in the caliper-points.

hat I claim as my invention, and desire to secure by Letters Patent, is-

1. A micrometer for inside calipering comprising a stock or handle provided at one end with a lat erally-proj ecting fixed caliper-point, means for adjusting said point on the stock to different indicated diameters, an arm pivotally mounted between its ends upon the stock, a caliper-point at one end of said arm in alinement with and set in the opposite direction from said stationary point, an adjustingscrew on the stock engaging the other end of the arm to impart angular movement thereto, a graduated wheel onsaid screw, and an index on the stock adjacent the wheel, whereby the angular movements of the screw may be read to determine the adjustment of the caliper-point carried by said arm, the two caliperpoints being at known distances apart when the wheel is at zero.

2. A micrometer for inside oalipering comprising a stock or handle, a screw-threaded caliper-pin held in a threaded socket at one end thereof and projecting laterally therefrom, means for setting said pin for different determinate diameters, an arm pivotally mounted on the stock and having a caliperpoint at one end in alinement with and set in the opposite direction from said pin, an ad justing-screw on the stock for imparting angular movement to said arm, and a graduated wheel on said screw for determining the adjustment of the caliper-point carried by said arm.

3. A micrometei for inside calipering comprising a stock or handle, a screw-threaded caliper-pin held in a threaded socket at one end thereof and projecting laterally therefrom, a scale at one side of said pin along which its rearward end travels and whereby the pin may be set for different determinate diameters, a movable caliper-point in alinement with said pin, and means for reading the adjustment of said movable point.

4. A micrometer comprising a stock or handle, a screw-threaded caliper-pin held in a threaded socket at one end thereof and projecting laterally therefrom, a removable graduated disk adapted to be placed upon said pin in turning engagement therewith, an index on the stock whereby said disk may be set to indicate the lateral movements of the pin due to partial rotations thereof, a movable caliper-point in alinement with said pin, and means for readmg the adjustment of said movable point.

In testimony whereof I have affixed my signature in presence of two witnesses.

DAY K. LEE.

Witnesses G. M. TOZER, GEO. H. Dovn.