US1558318A - Inside micrometer gauge - Google Patents

Description

Oct. 20, 1925.

H. VOLIS v INSIDE MICROMETER GAUGE Filed Aug. 2 1924 A/W WIZZVENTOR.

g ATTORNl-IY.

Patented Oct. 20, 1925.

UNITED STATES PATENT OFFICE.

HARRY VOLIS, 013 DETROIT, MICHIGAN, ASSIGNOR T VOLIS PRECISION TOOL COM- IPANY, OF DETROIT, MICHIGAN A CORPORATION OF MICHIGAN.

INSIDE. MICROMETER GAUGE.

Application filed August 21, 1924. Serial No. 733,314.

To all whom it may concern:

Be it known that I, HARRY VOLlS, a citizen of the United States, and residing at Detroit, in the county of lVayne and State of Michigan, have invented a new and Improved Inside Micrometer Gauge, of which the following is a specification.

This invention relates to means for accurately determining the diameters of holes in and bores of metal bodies and the object of this invention is to produce an instrument of this character which can be correctly adjusted and which, after it becomes worn, can be readily and correctly readjusted.

A further object of this invention is t produce an instrument of this character which can be readily corrected should its operative surfaces get out of alinement.

This invention consists in a body having longitudinal slots and blades slidably mounted therein and provided with inner edges which are inclined in the same directio-n, a pair of expanders engaging said inclined edges, means tomove said expanders to cause the blades to slide out radially, and means to move one of said expanders relative to the other so as to cause the adjacent ends of the blades to move outwardly or inwardly while their opposite ends are sub stantially at rest so as to eliminate any taper there may be in the operative portion of the instrument and to bring the operating sur faces of the blades into parallellism.

It further consists in an instrument of this character embodying anindicator and an operating member to move the expanders relative to the blades and provided with a threaded portion engaging a threaded mem her on the body, the indicator and body being graduated to indicate the exact diameter of the outer surface of the testing blades, the indicator and operating member being relatively movable to permit accurate adjustment of the instrument for-diameter.

It further consists of the details of con- .struction illustrated in the accompanying drawing and particularly pointed out in the claims.

In the drawing, Fig. 1 is a plan of this improved inside micrometer gauge. Fig. 2 is a longitudinal section thereof. Figs. 8 and 4 are sections on the lines 3- 3 and 4- & of Fig. 2,

Similar reference characters refer to like parts throughout the several views.

The body of this instrument, that is, that portion which is rigid when assembled, comprises a head 1, a cap 2 secured to the head by means of screws 3, a handle 4. screwed onto the neck 5 of the head and a tubular member 6 screwed into this neck. Except for difficulties in manufacture, the head and tubular member might be integral.

The head 1 is radially and longitudinally slotted to receive the radially sliable blades 8 which are internally grooved to receive the springs 9 whose ends extend into the circular groove 10 in the cap and beneath the circular shoulder 11 of the head. Pins 12 position these springs. The blades have inclined inner edges 14 and 15 which are at I prefer to form the expanders of hard steel and the bushings of bronze to avoid wear and friction respectively. The ex- .panders have flat inclined surfaces at the same angle as the edges 14 and 15 of the blades. Outward movements of the expanders are resisted by the springs 9 but are effected through the ball bearing 27 and devices to be explained later on; These expanders do not rotate in the head, being prevented by the engagement of their flat surfaces 13 with the ends of the blades.

The pressure of the bearing 27 on the inner end of the bushing is transmitted in art to the sleeve 22 and by that to the bus ring 23. The sleeve 22'is slidable on the shaft 16 but cannot rotate thereon be cause of the screw 28 in this shaft extending into the slot 29 in the sleeve. The angles of the expanders being the same, both ends of the blades 8 will move outwardly the same distance for equal longitudinal movements of the expanders. But should the outer ends of the blades extend outward a greater or less distance than the inner ends, which is the case when the blades become worn, then the screw 17 is releasedand the shaft 16 and the sleeve 22 turned relative to the bushing 23 to move the expander 2i inward or outward until the operating sur faces of the blades are in exact parallelism.

The end 31- of the tubular member 5 is formed with very i-inifornil pitched and quite fine threads, preferably forty per inch and an operating sleeve 32 is externally threaded to fit therein. The inner end or" the sleeve engages the bearing 27 so that the enpanders are moved outwardly when this sleeve is turneiil in one direction and are moved inwardly through the pressure of the springs 9 when the sleeve 32 is turned in the opposite direction. It the angle of the operating surfaces of the eX panders to the axis of the shaft 16 is thirty degrees and the threads on the sleeve are forty per inch, one rotation of the sleeve will cause the blades to move outwardly .0125 inch and measurements of .0001 of an inch are easily determined.

I. prefer to secure an indicating shell or indicator 3 1 to the operating sleeve 32 and to graduate itstapering outer end 35,- and to graduate the middle portion of the tubularineniber 6 toco-operate' with the graduations on the indicator 34. Openings 36 may be formed in the handle l through which these graduations may be seen, and when Vernier graduations are employed, variations of .0001 inch in the working diameter of this instrument are provided for.

The blades are first positioned for a predetermined measurement. The indicator 3-1; is then accurately positioned on the tubular member 6 so that their nations indicate the desired diameter. The screw 38 is then forced, in to press the ball 39 against the interior surface of the sliellwliicli locks the indicator to the operating sleeve. This operating sleeve is mounted on the tubular member 6 and is bore-d to it the shah. l6 which is therefore suppc'irted thereby.

A collar ll is firmly held in the handle l by being a press-fit. An operating connector 4; is rotatably mounted in this collar and its inner end comprises a pair of fingers 18 which extend into notches in the adjacent end of the operating sleeve A locking button ail screws onto the outer end 1-6 oi this connector and an operating collar is slidably but non-rotatably attached to the connector by the pin 47. A spring washer 48 is placed between the button i l and the shoulder 49 of the collar The inner end of the operating collar .15 and the shoulder 50 of the connector 42 engage the stationary collar ll. A. screw 52 carried by the operating collar 45 enters the groove 53 in the locking but-ton and prevents it from getting lost but permit-s suflicient longitudinal movement-0f the but-ten.

VVhe'n the looking button is screwed down onto the threaded end d6 of the connector 12. the spring washer l8 causes the operating collar 45 and the shoulder 50 on the connector to engage the stationary collar -ll of the handle with such for-ceas to prevent movement betweenthem. This also locks the operating sleeve and therefore substantially locks the blades.

When the button lei is turned back to release the operating collar this may be freely turned to turn the connector 41-2 and the sleeve 32 and thus cause the expanders to move longitudinally of the blades.

The threads between the portion 31 01 the sleeve 6 and the sleeve 32 must be accurately uniform in pitch and the angle oi the inclines of both of the expanders m: be the same and must be laid out to cooperate with the gradu'ations of the indicator and the tubularmember 6. These are matters well within the domain of skilled e 'ineers. The details of construction and proportions and sizes of the parts may also be varied by those skilled in the art without departing from the spirit ot-my invention as set forth in the following claims.

I claim 1. in a gauge, the combination of a hollow cylindrical body having a radia lslot, a central shaft in the body, expanilers slidalny mounted on the shaft and havii'ig sur faces inclined to the axis oi said shaft, a blade mounted in the slot in engagement with said inclined surfaces on the expanders. means toslide the expander-s along the shaft in onedirection as a unit to force the blade outwardly, and means to vary the distance between said expan'ders.

2. In a gauge, the combinwion of a hob low cylindrical body having a adial slot. a central shaft in the-- body. expandcrs slida bly mounted on the shalt and having surfaces inclined to the axis of said shalt, a blade inountedin the slot in engagement with said inclined surfaces on the expanders, means to-slide the estpauders along'the shaft in one direction as a unit to tlo'rce the blade outwardly, resilient means to draw theblade into the slot and to slide the expander-s in the opposite direction. and means to vary the distance between said expanders.

3. In a gauge, the combination or a hellow cylindrical body having radial slots. expanders movable longitudinally oi the body and having operating surfaces inclined to the axis oi? said shatt. blades mounted in the slots contacting with the inclined sun faces on the expandcrs. a tubular e:-:tension. on the body having a threaded end. an operating member operatively engaging said threaded end and the expanders to force the expander-s along the shaft in one direction as a unit to cause the blades to move outwardly, and means to vary the distance between said expanders.

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4:. In a gauge, the combination of a hollow cylindrical body having radial slots, a central shaft mounted in the body, eX- panders slidably mounted on the shaft and having surfaces inclined to the axis of said shaft, blades mounted in the slots and provided with inc-lined surfaces in engagement with the inclined surfaces on the expanders, a tubular extension on the body having an internally threaded end, an operating sleeve engaging said threaded end and the expanders to force the expanders along the shaft in one direction as a unit to cause the blades to move outwardly, and means to vary the distance between said expanders.

5. In a gauge, the combination of a hollow cylindrical body having radial slots, a central shaft mounted in the body, expanders slidably mounted on the shaft and having operating surfaces inclined to the axis of said shaft, blades mounted in the slots in engagement with the inclined surfaces on the expanders, a tubular extension on the body having an internally threaded end, and an operating sleeve engaging said threaded end and the expanders to force the expanders along the shaft on one direction. as a unit to cause the blades to move outwardly.

6. In a gauge, the combination of a hollow cylindrical body having radial. slots, a cent :11 shaft mounted in the body, expanders slidably mounted on the shaft and having surfaces inclined to the axis of said shaft, blades mounted in the slots in engagement with the inclined surfaces on the expanders, a tubular extension on the body having an internally threaded end, an operating sleeve engaging said threaded end and the expanders to force the expanders along the shaft in one direction as a unit to cause the blades to move outwardly, means to vary the distance between said expanders, a graduated indicatdr adjustably secured to the operating sleeve, and a cylindrical handle attached to the body and provided with openings through which the graduations on the indicator may be observed.

'7. In a gauge, the combination of a hollow cylindrical body having radial slots, a central shaft mounted in the body, expanders slidably mounted on the shaft and having surfaces inclined to the axis of said shaft, blades mounted in the slots in engagement with the inclined surfaces on the expandcrs, a tubular extension on the body having an internally threaded end, an operating sleeve engaging said. threaded end and the expanders to force the expanders along the shaft in one direction as a unit to cause the blades to move outwardly, means to vary the distance between said expanders, a

graduated cylindrical indicator adjustably secured to the operating sleeve, a cylindrical handle attached to the body and provided with openingsthrough which the graduations 011 the indicator may be observed, and an operating collar at the end of the handle connected to the operating sleeve, said collar being rotatable relative to the handle and slidably connected to said operating sleeve.

8. In a gauge, the combination of a hollow cylindrical body having radial slots, a central shaft mounted in the body, expanders slidably mounted on the shaft and having surfaces inclined to the axis of said shaft, blades mounted inthe slots and provided with surfaces in engagement with the inclined surfaces on the expanders, a tubular extension on the body having an internally threaded end, an operating sleeve engaging said threaded end and the expanders to force the expanders'along the shaft in one direction as a unit to cause the blades to move outwardly, means to vary the distance between said expanders, a graduated indicator adjustably secured to the operating sleeve, a cylindrical handle at tached to the body and provided with open ings through which the graduations on the indicator may be observed, an operating collar at the end of the handle connected to the operating sleeve, said collar being rotatable relative to the handle and slidably connected to said operating sleeve, and means to lock the collar.

9. In a gauge, the combination of a. hollow body having an even number of radial slots, blades mounted in said body and having their inner edges formed with surfaces inclined to the axis of said shaft, expanders movable in said body and having surfaces inclined in the same direction in engagement with the inclined surfaces on the blades, a screw to force the expanders to more in one direction, and springs in engagement with the blades to move the expanders in the opposite direction. 10. In a gauge, the combination of a hollow body having an even number of radial slots, blades mounted in said body and having their inner edges formed with surfaces inclined to the axis of said shaft, expanders movable in said body and having surfaces inclined in the same direction in engagement with the inclined surfaces on the blades, a screw to force the expanders to move in one direction, and springs to move the expanders in the opposite direction, said blades being longitudinally grooved in their inner edges and said springs being seated in the grooves and engaging the body with their ends.

HARRY VOLIS.

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