US2551242A

US2551242A - Micrometer attachment

Info

Publication number: US2551242A
Application number: US618221A
Authority: US
Inventors: Vincent H Burwinkle
Original assignee: Individual
Current assignee: Individual
Priority date: 1945-09-24
Filing date: 1945-09-24
Publication date: 1951-05-01
Anticipated expiration: 1968-05-01

Description

May l, 19.51` Y v. H. BURWINKL 2,551,242

MICROMETER ATTACHMENT Filed Sept. 24, 1945 INVENTOR. V//VCE/y 50km/wa@ Y Patented May 1, 1951 rrp srATss eATENT .ortica MICROMETER ATTACHMENT Vincent H. Burwinkle, Cedar Rapids, Iowa Application September 24, 1945, Serial No. 618,221

The present invention relates generally to measuring instruments and is more particularly concerned with inside micrometers and attachments therefor.

The object and general nature of this invention is the provision of a device particularly constructed and arranged to receive, in either of two optional positions, an ordinary internal micrometer, whereby the device may be used as an inside micrometer or as a depth gauge.

This device may also be used as a height gauge, inspection tool, side depth micrometer, tool setter, slide parallel, surface gauge, or for measuring the depth of holes.

These and other objects of my invention will fbe apparent from the following detailed description, taken in conjunction with the accompanying drawings in which:

Figure 1 is a plan view of a measuring device in Which the principles of the present invention have been incorporated.

Figure 2 is a side view of the unit shown in Figure 1 with parts broken away in order to show the construction more clearly.

Figure 3 shows an optional mounting of the micrometer.

Figure 4 is a perspective view of an adapter which is provided to permit the use of this kind or .size of micrometer.

Referring now more particularly to Figures 1 and 2, I provide a base I, consisting of a rectangular block, preferably formed as a steel bar ground on opposite sides 2 and 3 to a high degree :of accuracy, the opposite sides 2 and 3 being parallel. The bar I is provided with a pair of

lopenings

5 and 6, and into the opening 5 is fitted a hollow circular holder 8 having an outer collar .section .9 and a neck section I6, the latter being .screw threaded internally, as at II. The collar section 3 is internally recessed, as at I3 and re- '.ceives a split bushing I4 accurately tted therein. The collar section 9 is tapped to receive a threaded set screw I6 which at its inner end bears .against the split bushing I4. A plug or set-piece 2l is inserted in the threaded portion II of the holder 8 and carries a stud 22, the upper end 23 of which is adjusted accurately to lie in the plane `of the upper face 2 .of the block I. The end of the latter is tapped as at 2li to receive a set screw 25 which, when tightened, serves not only to lock the holder 8 in the block I but also to retain the plug 2l in position therein.

The other opening 5 in the block I is smooth and receives a split bushing 21, the ends of which are spaced apart .a small distance, as at 28 (Fig.

5` claims. (o1. 33 167) 1). The block I is tapped to receive a set screw 29 which bears at its inner end against the bushing 21.

An internal micrometer, of conventional construction so far as the present invention is concerned, is shown at 30 and for purposes of this disclosure comprises a sleeve 3| anda thimble 32. The sleeve carries a socket, as at 34 and an associated clamping member 35 formed to receive any one of a number of extension rods 36 of different lengths, the selected extension rod being held by tightening set screw 31. The thimble 32 of the micrometer 33 is provided with a head 39. The micrometer 30 is so constructed that by turning either the sleeve or the thimble relative to the other end rod 33 will be extended relative to the head 39 and the amount of extension, or retraction, accurately determined by the measuring graduations 4I.

The micrometer 33 may be mounted either in the holder 8 or in the bushing 21. When mounted in the holder 8, as shown in Fig. 2, the head 39 is placed in engagement with the stud 23 and the set screw I6 tightened to hold the unit 30 firmly in the holder 8. When mounted in this fashion, with the selected extension rod 36 in place, the device may Abe used for measuring accurately the distance from the face 2 of the block I to the part or surface with which the end of the extension rod 3S is brought into contact. When the micrometer 33 is mounted in this position the device may, for example, be used in measuring depths.

The micrometer unit 3|l may also be mounted in the opening E, this being the position shown in Fig. 3. When the micrometer 33 is in position the setscrew 29 is tightened which, acting through the split bushing 21, firmly clamps the unit 33 in position but Without marring or damaging the micrometer. Likewise, when the set screw I3 is tightenedit acts through the split bushing I4 to hold the micrometer in position in the holder 8 without marring or damaging the micrometer. When the micrometer 33 is inserted in the opening 6, the head 39 is brought accurately into the plane of the lower face 3 of the block I, and hence the micrometer can then be used to measure accurately the distance from the lower face 3, or from the surface on which the face 3 is placed, to the surface or object with which the upper end of the extension rod 36 is brought into contact. Thus, the device, arranged in this way may be used as a height gauge.

This device may be used with different kinds of micrometers and in some cases the micrometerreceiving opening in the base and holder can be reduced by an adapter, shown in Fig. 4. The adapter, indicated by reference number 50, comprises a split bushing I with the ends thereof separated, as at 52. The bushing 5l has an external diameter such that it fits snugly within either of the bushings I4 and 21, whereby tightening either of the set screws i6 or 2S will act through both split bushings to clamp the micrometer in place.

While I have shown and described the preferred form of my invention, it is to be understood that my invention may take various forms, as defined in the appended claims.

What I claim is:

1. A measuring device comprising abase having spaced-apart upper and lower -fac'e's ardliavin'g a pair of apertures therein, ,a micrometer holder mounted in one of said apertures, a plug disposed in said holder and adapted to position thehead of an internal nicrometercarried thereby in the plane of the upper' surface of saidbase, means for clamping said micrometer in said holder, and

other means adapted for clamping a micrometer in the other aperture in'sai/dba'se.v

2. A measuring device comprising a base having spaced-apart upper and lower surfaces and having 'a pair of apertures therein, means for clamping a micrometer in one of said apertures *with the end of the head of said micrometer disposed in the plane of the Vsaid lower surface of the base, and other meansfor'selectively clamping the Ysaid micrometer in theA other ofv said apertures with the end of the head ofthe micrometer in the plane of the said upper surface of the base, the last mentioned clamping means including a sleeve, receivable in the other of lsaid apertures, and having' a portion thereof extending beyond the said upper surface of the base, the said sleeve having an aperture in the upwardly extending portion thereof for receiving the micrometer and having stop means therein disposed in the plane of the upper surface for positioning the head of the micrometer. Y

3. A device for use with an internal micrometer comprising a base member having spaced, parallel, upper and lower surfaces, a sleeve received in an openingY in said base, said sleeve having a portion thereof 'eitending above the upperl of said surfacesand said'portin having an aperture therein for thereception of one end of an internal micrometenthe sleeve having stop means therein positioned in the plane of the upper surface of said' base and adaptedto position the head of a micrometer in the plane of the said upper surface, means securing the sleeve in the opening, and means for securing a micrometer in the apertures in the said sleeve.

4. In a base for a measuring instrument having two parallel faces, an opening leading through the base at right angles to the parallel faces, a hollow, circular holder adapted to be tted into the opening, said circular holder having an outer collar section and a neck section, the neck section being screw threaded internally, the collar section being internally recessed, and a split bushing accurately fitted within the recess, a threaded set screw adapted to have threaded engagement with a tapped opening leading through the collar and thetap'ped opening being so placed that when the set screw kislocked down, its inner end bears against the split bushing, a set piece inserted in thth'read'ed Vpdrtih of the holder and having a stud whereby the set piece may be adjusted so that the upper end of the stud is in the plane of the upper faceof the block, and a set screw for holding the holder and the set piece in place when properly adjusted.

5. In a device of the character described, means for mounting an inside micrometer on a block so that'the inside micrometer may be supported with one of its heads having the end thereof in the plane of the upper surface Vof the block, comprising a hollow, circular holder'having an outer c01- lar section and a neck section, thel neel; section being screw threaded internally, the collar section internally recessed and the block having an opening therein for receiving the neel; section, means for'locking the thimble of the internal micrometer in the collar section, and plug means adllStable'within the neck sectionfor up and down movement to permit adjustment thereof. so that the head of the micrometer may have its lower surface in the plane of the upper surface of. the' block.

' VINCENT H. BURWINKLE.

REFERENCES CIVTEIY)r The following references are of record in the le of this patent.:` UNITEDv STATES PATENTS Number Name Date 374,168 Barnes Dec. 6,; 1887 1,226,574 Nielson L `May 15,1917 2,030,864 Gielow Feb. 18, 1936 2,417,150 Beiry Mar. 11,' 1947 FOREIGN PATENTS Number Country Date 143,615 Great Britain May 25, 1920