US369357A - Micrometer-gage - Google Patents

Description

(No Model.)

J. MOFFITT.

MIGROMETBR GAGE.

No. 369,357. Patented Sept. 6, 1887.

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Nrrnn STATES PATENT Darren.

JERREY MOFFITT, 0F SOUTHBRIDGE, MASSACHUSETTS.

MlCROlVlETER-GAG.

SPECIFICATION forming part of Letters Patent No. 369,357, dated September 6, 1887.

Scrl-al No. 233,531. (No model.)

fo all whom it may concern,.-

Be it known that I, JERREY Monnier, a citizen of the United States, residing at Southbridge, in thc county of .Vorcester and State of Massachusetts, have invented certain new and useful Improvements in Miorometer-Calipers, of which the following, together with the accompanying drawings, is a specification sufficiently full, clear, and exact to enable persons skilled in the art to which this invention appertains to make and use the same.

`The'object of my present invention is to provide an adjusting device for the micrometerscrew which will overcome the objection heretofore found to the irregular wearing of the screw and the binding or cramping of the threads after the screw has been turned beyond the limit or point of its usual wear; also, to provide a practical adjusting device conveniently accessi ble for adjustment without the necessity of removing the outer sleeve and micrometer-*screw from the frame. These objects I attain by an instrument constructed as shown in the drawings and as hereinafter described, the particular subject-matter claimed being hereinafter definitely specied.

ln the drawings, Figure l is a side view of a micrometer-caliper constructed in accordance with my invention. Fig. 2 is a section showing the foot of the frame and the anvil or stud. Fig. 31's a section at line .t a', Fig. 1, looking upward. Fig. 4 is a section of the frame at linear a', with the other parts removed, looking downward. Fig. 5 is a side view of the adj listing-sleeve separate from the frame. 6 is a transverse section of the adjust Fig. 7 is a transverse section at the position of linee e, Fig. 1.

In referring to parts, A denotes the frame, which is provided with the projecting cylinder A', through which the micrometer screw or spindle B passes, and with a foot, a, for the anvilstud. Y

C indicates the outer sleeve or cylinder, iixed to the head of the micrometer screw or spindle B, and provided with a milled head, by which it can-be conveniently turned for rotating said screw and effecting adjustment of the caliper. The cylinderA and the outer sleeve, C, are provided with a graduated scale 'for indicating the measurements in the usual manner.

D indicates an adj ustingsleeve for the purpose of taking up backlash and wear of the screwthread- Said adj usting-sleevc is made, as indicated in Fig. 5, with a screw-thread, d, at its inner end, that matches with a corre sponding thread, d', formed at the inner end of the frame-cylinder, while within the opposite end of said adj listing-sleeve there is formed the screwthread b', that matches with the screwthread b on the micrometer screw or spindle B. The sleeve D is also provided with the inclined or conical section f, that engages with a shoulder or opposite incline, c, formed within the framecylinder A when the parts are together.

The screw-threads d d for the adjustingsleeve and the screw-threads Z) b for the niicrometcr-screw are made of ,the same pitch* say forty to the inch-so that any adjustment or movement of the sleeve will not cause derangement of the graduated index, as the movement on one thread will compensate for the movement on the other when the sleeveD is revolved for effecting the adjustment. The sleeve D is slittcd throughout the greater portion of its length, as indicated at m, (see Figs. 5 and 6,) and is provided at its inner end, D', with a nick, a, to facilitate turning it when inserted in the frame.

Vhen the sleeve D is rotated, the action of the screw-threads d d draws down the incline or coned surfacef against the inclined surface e, and said surface f acts as a wedge for forcing together the outer ends of the slittcd sleeve D, causing the screw-thread b to more closely embrace the thread b of the micrometer-screw, the pressure being elastic by reason of the springing action of thc sides of the slittcd sleeve.

The sleeve D can be turned at any time for tightening or loosening the bearing upon the thread b by a suitable spanner or wrench applied to the end of the sleeve DWhere it projects from the frame, the adjustment being conveniently effected without the necessity of unscrewing the cap-cylinder G or removing the micrometer-screw from its place.

This manner of constructing the adjustingsleeve and adjacent parts is comparatively simple and convenient for manufacture. Another advantage is, that it leaves no opening or crevice in the exterior of the instrument to ICO become filled 'with dirt or grit and thereby interfere with the perfect operation of the instrument. This manner of constructing the sleeve and arranging the same in combination with the frame and micrometerscrew is a feature of my invention.

The end or foot of the frame at ce, I make of the same thickness as the diameter of the micrometer-screw B, and with its outer part rounded off on a circle corresponding to the cylindrical circle of the screw. Into said end a of the frame I insert the anvil or step I in the manner shown. Saidl anvil has a squarefaced head corresponding in size to the micrometer-screw, and a screw-threaded shank, I', of smaller diameter, that is screwed into a threaded hole,-I2, formed through the foot a of the frame, the anvil-shank I being inserted therethrough in outward direction, and its outer end provided with a nick or means whereby the screw can be turned for adjusting the anvil.

The face of the anvil and micrometer-screw arey made the full diameter or area of the screw, so as to give square angles, as attI i. By thus forming the end of the frame A, the anvil-top, and end of the micrometer screw of the same diameter I produce an instrument which can be used for calipering the gage of slightly projecting ribs or flanges on the surface of solid bodies, since the square anglesz' and the nonprojection of the frame at a beyond the circumference of the anvil and screw permits of the caliper being worked close down to a flat surface, as indicated in dotted line, Fig. 3.

I am aware that micrometer-calipers have heretofore been made in which devices for taking up the vwear on the screw-threads are employed, and Ido nottherefore claim ,broadly, the employment of means for adjustment; but,

so far as I am aware, the means which I employ are different in construction and mode of operation from any devices heretofore employed for the purpose, while my device also gives elastic pressure on the threads of the micrometer-screw, which is a desirable incidental feature.

What I claim as of my invention, and desire to secure by Letters Patent, is

l. The combination, with the frame having the projecting cylinder provided internally with an inclined or conical surface and a screwthread at thc inner end, the micrometer-screw, and the outer sleeve, of the internally-slitted adj usting-sleeve having an external thread, d, at its inner end fitting to a thread in the frame, au internal thread, b', at its outer end fitting the micrometer-screw, and an intermediate conical surface, f, engaging the conical snrface e ofthe cylinder, substantially as set forth.

2. The combination, with the micrometerscrew B, its supporting-cylinder A, and operating-sleeve C, of the adjusting-sleeve D, having an inclined surface and engaging threads, with its end D extending from the supporting-cylinder in convenient position to be turned by a wrench or Spanner, substantially as set forth.

Witness my hand this 28th day of March, A. D. 1887.

JERREY MOFFITT. Witnesses:

E. M. PHILLIrs, WM. T. RoBrNsoN.

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