US1653854A - Micrometer - Google Patents

Description

Dec. 27, 1927. I 1,653,854

J. A. HUGE MICROMETER Filed Sept. 22. 1926 Inventor fit) Patented Dec. 27, 1927.

UNITED; STATES PAT MICROMETER.

Application filcdfieptember 22, 1926. Serial ififo 136.937

This invention relates to an improved micrometer and has more particular reference to an inside micron'ieter head. i

lh'iefiy, the improved instrument COUL- prises a"cylindrical shell having means at one end to acconni'iodate a manually adjustable micrometer and having means at its opposite end accommodating an automatically adjustable means for cooperationwith the manually adjusted means, to permit more accurate nieasurenient to be obtained.

lilore specifically, the invention relates to a cylindrical shell having an internallyscrew threaded cylinder at one end to 30001111110 date the manually adjustable micrometer, the shell being constructed at its opposite end to accommodate. a spring pressed plunger and measuring element which actuates an indicator such as may he more readily visualized under conditions such as make the reading of the ordinary micrometer di'll'icult and i111 certain. l

Other features and ad *antages will becoi ne apparent during (the course of the fol lowin; description.

In the accompanying drawings, where n like reference characters are en'iployed to ('lesignate like parts throughout the same:

Figure 1 is atop plan view of a measuring instrument constructed in accordancewith the invention,

Fig. 2 is a central longitudinal view throughthe same, showing parts in elevation,

Fig. 3 is a transverse section taken ap proximately upon the plane of the line 33 of Fig. 1 looking in the direction of the arrow.

Referring to the drawings in detail, it will be seen that the referencecharacter 1 designates the cylindrical shell which is open at its opposite ends and provided at its center with a partition 2. Extending from one side of the partition is a cylinder 3 located within the shelland terminating in spaced relation from the left-hand end. In this connection it will be noted thatthe left-hand end is provided with a bevel equipped with customary graduations &. Moreover, it will lie noted that the cylinder 3 is internally screw-threaded and is spaced from the surrounding wall of the shell. This a rangement serves to accommodate a somewhat conventional form of manually adjustable inside micrometer. The part of the micrometer fitting into the screw threaded cylinder 3 cooperates with the aforesaid graduations el in an obvious manner. Extending from the oppositeside ot the partition is .a relatively short cylindrical guide 5 inwhi ch the nner end portion otthe plunger and the measuring stem 6 are slidably mounted. In this connection it will be noted that the partition 2 is provided with able passage of the. inner :lrce end portion of the stun. ilioreover, the stem is pro vided with a circular shoulder 6 slidaible in the guide and a coiled springv 7 surrounds the stern between the shoulder tion. and is confined in said guide. The spring is enceptirma-lly sensitive and will permit sliding movement of the stem assoon as a very slight pressure;is brought to bear upon the same. The intermediate portion of the stem providedwith a gear 8 which co-. operateswith centrally disposed teeth 9 on a rotatably mounted shait 10. The teeth are (harmed y by. providing circumfereiitially spaced grooves inthe shaft. Moreover, the shaft is pointed at one end, as at 10 and journaled in the shell and its opposite endis rotatably mounted in a part of theeigt ernal gauge 11. In connection with the gauge it is to he statedthat thisincludes-a suitable dialand a transparent glass 12; In addition there is a pointer 13 outhe end of the shaft which cooperates with the dial which is preferably graduated in thousandths of an inch.

Movement of the stem in one direction is limited by the stop 1% and in the opposite direction it is limited by a similar stop 15. The end portion 16 extends through a closing head 17; This head is removahly fitted into the adjacent end of the aforesaid cylindrical shell and the measuring stem normally projects a predetermined distance beyond the base of the head as shown. The head is provided on one side with a socket and located in this socket is a plate 18, a coil spring 19, and an operating member 20. This member bears against the spring and is preferably provided on its outer end with a finger piece 21. The advantage of this construction is that in case the gauge cannot be read conveniently, the member 20 can be tightened to hold the stem 6 in the position to which it has been moved. In turn, the indicating finger 13 will be held. Inthis way the instrument can be removed from the work and the gauge easily read, at

which the stem can be released to resume its normal position under the action of the cur rQEFtCtZ.

an opening; tin. slid and the parti-j sprin The micrometer is of course used as any other inside micrometer but the par ticular construction shown will save much time and will insure accuracy in measurement. Instead of having to adjust by touch, as is now customary to one-thousandth of an inch, the stem can be adjusted within one hundred-thousandthof an inch while and in such position the dial can be conveniently read. The supplemental plunger and indicating meansfmaybe operated eiiiciently in'conjunction with the manuallyadjustable micrometer (not shown) on the opposite end to insure an accurate and true measurement.

The advantages andconstruction w ll become apparent from the foregoing description and drawin Therefore, a more lengthy description is thought unnecessary.

I claim;

1. In a measuring instrument,a shell provided with an internally screw-threaded cylinder atone end to accommodate a manually adjustable insidemicrometer, a head at the opposite open end of said shell, said head being provided with aguide opening, astem mounted for sliding movement in saidshell, and having one of its ends projectable through and beyond said guideopening and its other end terminating in said shell spring means connected with the last named end ofthe stem for normally pushing the opposite end of the same through'said guide opening, a gear carriedby the intermediate portionlof the stem, a shaft located in and extending acrosssaidcylinder at right anglesito said stem and provided with teeth cooperable with said gear, a pointer carried by one "end of said shaft, and a gauge mounted on said'body and includlng a dial wlth which and polnter 1s cooperable.

2. In a measuring instrument, an open ended cylindrical shell provided with a central apertured partition, a cylinder located within one end portion otthe shell and connected with said partition, said cylinder being provided with screw threads and being adapted to operate as necting means for a manually adjustable inside niicroineter, a cylindrical guide carried by the opposite side of said partition, ahead carried by one end of the shell andprovided with a central guide opening in alinen'ient with said cylindrical guide, a stemslidablc through the opening insaid partition at one end and through the opening in said head at: its other end, said stem being provided with an intermediate gear, a shaft mounted for rotation in saidshell and extending across said stem at right angles to the latter and provided with teeth coopera mounting and coniii able with the teeth of said gear, spring meansassociated with thelastnamed end of said stem and located in said cylindrical guide for pushing said stein outwardly through and beyond the guide opening in said head, a pointer carried by said shaft, a gauge mounted on the body end including a dial with which said pointer is cooperable, and a manually adjusted retaining device carried by said head and cooperable with said stem for holding the latter in a set position. v

In testimony whereof I affix my signature;

JOHN aneusrus noon.

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