US720947A - Micrometer-calipers. - Google Patents

Description

PATBNTBD fx1-:13.17, 1903,.

R. MILLER. MIGROMETBR GALIPBRS.

APPLICATION FILED AUG. 14, 1902.

NO MODEL.

Wl TNE SSE S EV-A ATTORNEYS.

me nomas mm comoro-Luna. wmdfom u. c.

UNITEDV STATES ArnNr Fries.

RUDOLPH MILLER, OF CHAMBERSBURG, PENNSYLVANIA.

MICRONI ETER-CALEPERS.

SPECIFICATION forming part of Letters Patent No. 720,947, dated February 17, 1903. Application lod August 14, 1902:. Serial 110.119.635. (No model.)

To afZZ whom t may concern.-

' Be it known that I, RUDOLPH MILLER, a' citizen of the United States, and a resident of Chambersburg, in the county of Franklin and State of Pennsylvania, have invented new and useful Improvements in Mecrometer-Calipers, of which the following is a full, clear, and exact description.

My invention relates to micrometer-calipers, my more particular object being to produce a calipers having several nice adjustments for the purpose of increasing the precision of the instrument. A-

Reference is to be had to the accompanying drawings, forminga part of this specication, in which similar characters of reference indicate corresponding parts in all the figures.

Figure l is a plan view of my calipers. Fig. 2 is an edge elevation of the same. Fig. 3 is a View somewhat similar to Fig. 1, but showing certain parts occupying different relative positions. Fig. 4 is a section, some- What enlarged, upon the line it 4 in Fig. 1 looking in the direction of the arrows. Fig. 5 is a section upon the line 5 5 of Fig. 1 looking in the directionv of the arrows. Fig. 6 is a Section upon the line 6 6 of Fig. 1 looking in the direction of the arrows; and Fig. 7 is a fragmentary elevation of one of the jaws 16, together with certain spring mechanism contained therein.

A jaw 1 is provided with a scale 2 and with a point 3. A leaf -LL is movable relatively to the jaw l and is provided with an arc-scale 5 and with a head 6. A micrometer-screw 7 passes through the head 6 and engages the plate S, which is integral with the leaf 4E, being separated therefrom bya slot 9. By adjusting the micrometer-screw' the indicator-plate 8 maybe moved relatively to the head 6,and thereby brought exactly into alinement With any given graduation upon the scale. The screw 7 thus acts as a micrometer adjustment for the plate 8. Upon the in place.

Then the needle is moved relatively to the arc-scale, the spring 12 is placed under greater tension.

A clip-platelet prevents the head 10 from moving asunder from the plate S, and thereby maintains the needle 12 in proper alinement. A screw-stop 15 is mounted upon the head lO. A jaw 16, provided with a point 17 and with an arm 18, is movable relatively to the tirstmentioned jaw. Upon the extreme upper portion of the arm 18 is mounted a G-shaped spring 19, vthe respective terminais of this spring being provided with micrometer screws 20 22. By adjusting the screw 2O the G -shaped spring is virtually rendered larger or smallar, whereby the length of the arm 18 is virtually changed within slight limits. The micrometer-screw 22 bears directly upon the screw-stop 15, so that by adjusting the screw 22 the position of the needle 11 when at rest may be slightly altered. The screw 20 therefore serves to adjust the sensitiveness of the needle 11,while the screw 22 serves to correct the portion of the needle. By means of the thumb-screw 21 the head 6, and consequently .the leafl 4, may be secured rigidly in position relatively to the scale 2- thatis to say, the'head 6 may be moved radially along the scale 2 and tightened in position relatively thereto. The head 6 being thus fixed relatively to the scale 2, the thumbscrew 7 may be used to force the plate 8 slightly asunder from the head6, thereby bringing the edge SiL precisely in line with any graduation upon the scale 2. It will be seen, therefore, that while the screw 2l secures the head 6 in such position that the edge 8g4 is substantially at the desired position, yet the use of the micrometer-screw 7 is usually necessary to bring the edge 8f exactlyin position. The arrangement thus constitutes both a coarse measure adjustment and a micrometer adjustment relatively to the scale 2.

'A thumb-screw 23 is used for the purpose .of clamping the jaw 16 to the lowerl end 4: ofk the leafft, thereby preventing movements between the same.

A micrometer-screw 24: passes through a spring-post 25 and engages a spring-stop 26, located rigidly upon the member fla. A springstop 26 is mounted within' an aperture 27, so

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that normally the bottom 4fof the leaf 4 has a slight degree of play relatively to the jaw 16. For this purpose an aperture 28 is made in the member 4, as indicated by dotted lines in Fig. 3. It is clear, therefore, that since by means of the screw 23 the members 4 and 16 may be clamped rigidly together and by means of the screw 21 the leaf 4 may be clamped lxedly in position relatively to the jaw 1 the calipers may be so arranged that either the jaw 16 and the leaf 4 and 4L may be caused toact practically as a single jaw, or the leaf 4 and 4 may be rigidly secured to the jaw 1, so that these parts are practically integral, while the jaw 16 may be allowed a slight play relatively thereto.

A pivotal screw 28 is provided with a disk 29 and terminates in a screw 30. This pivot is provided with shoulders 30, 30h, and 30,

as indicated more particularly in Fig. 4. A nut 31 engages the screw 30. A spring 32 (shown more particularly in Fig. 7) is secured by means of a pin 33 within an aperture 35 of the jaw 16 and is provided with a radiallydisposed end 34, which projects outwardly, as indicated more particularly in Fig. 4, and bears against a shoulder upon the member 16. The object of this spring 32 is to normally produce a slight tension between the flat leaf 44 and the jaw 16. The spring normally tends to draw these parts to the position indicated in Fig. 1, the abnormal position of the parts being indicated in Fig. 3. A spring 37, having substantially the form of a cupped disk, is mounted in the aperture 36 and serves to tension the several parts mounted upon the pivot 28a, as indicated in Fig. 4.

My invention admits of quite a variety of uses, some of which are indicated above. Suppose, for instance, it is desired to measure the degree of expansion in an object. The screw 21 is loosened, the points 3 and 17 are placed in contact with the object, the micrometer-screw 24 is adjusted until the needle 11 rests upon one of the graduations of the scale 5, the screw 23 is loosened, unless it should happen to be already loose, and the objects to be operated upon caused to expand. The result is that the points 3 and 17 are moved slightly asunder, as indicated in Fig. 3, the original position having been that indicated in Fig. l. The movement asunder of the points 3 and 17 causes the arm 18 to move relatively to the scale 2, as the result of which the micrometer-screw 22 presses upon the screw-stop l5 and moves the needle upon the arc-scale 5, as indicated in Fig. 3. A very slight movement asunder of the points 3 and 17 is'necessary to give the play of the needle aconsiderable amplitude. The springpost 25 consists of a split post and is employed as any other spring-post.

For certain fine measurements the head 6 is clamped upon the arc 2 by the screw 21, as above described, the indicating-plate 8 being brought as nearly as practicable into alinement with any selected graduation of the scale. Then by adjusting the screw 7 the plate 8 is moved exactly into the position desired, and measurements can thereafter be reckoned from the particular graduation thus chosen. This is especially desirable in instances where a plurality of comparative readings are desired-as, for instance, in measuring boards of slightly different thicknesses.

For ordinary uses it is preferable to tighten screw 23 and loosen the screw 21. This leaves the jaws 3 and 17 free to move toward and from each other, as in the ordinary calipers.

It will be observed, therefore, that while my improved calipers has quite a number of fine adjustments it is by no means necessary to employ all of them unless desired. In fact, the instrument admits of all of the uses of ordinary calipers and can be used as rapidly as the same; but in cases where desirable the adjustments above described may be called into requisition.

The instrument may be given great refinement in making measurements.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. A micrometer-calipers, comprising jaws normally free to move relative to each other, clamping mechanism for preventing relative movements of said jaws beyond certain predetermined limits, spring-controlled mechanism for preventing movements of said jaws within said limits, indicator mechanism for exhibiting the degree of said movements within said predetermined limits, and a micrometer adjustment for controlling the sensitiveness of said indicator mechanism.

2. A micrometer-calipers, comprising jaws normally free to move relatively to each other, one of said jaws being provided with an arc carrying a scale, a member sandwiched between said jaws and loosely connected with one of the same so as normally to have a slight play relatively thereto, said member being provided with an indicator for said scale, means, controllable at will, for regulating the degree of play between said members and said jaw connected therewith, a micrometric device for measuring the said degree of play, and means for clamping said jaws approximately in a predetermined relative position.

3. A micrometer-calipers, comprising jaws normally free to move relatively to each other, one of said jaws being provided with an arc carrying a scale, a member sandwiched between said jaws and loosely connected with one of the same, so as normally to have a slight play relatively thereto, said member being provided with an indicator for said scale, means, controllable at will, for regulating the degree of play between said member and said jaw connected therewith, a mi- IOO IIO

erometrie device for measuring the said degree of play, means for clamping said jaws approximately in a predetermined position so that said indicator may occupy a predetermned position leiativeiy to said seale, and

nlicrometric mechanism for placing said indicator exactly upon said scale.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

l RUDOLPH MILLER.

Witnesses:

WM. R. KEEFER, CHARLES G. WEIRICLL

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