US991839A - Micrometer-protractor. - Google Patents

Description

UNITED sraigslrnm OFFICE.

LEON FUCHS, OF DAYTON,

OHIO, ASSIGNOR T BROWN n SHARPE MANUFACTRING COMPANY, OF PROVIDENCE, RHODE ISLAND, A CORPORATION OF RHODE ISLAND.

MICROMETER-PROTRACTOR.

Specification of Letters Patent.

Patented May 9, 1911.

Application filed August 3, 1908. Serial No. 446,574.

To all whom it may concern.'

Be itknown that I, LEON Foei-Is, a citizen of Switzerland, residing at Dayton,4 in the county of M mtgomery and State of Ohio, have invented a new and useful Improvement in MicrometerProtractors, of which the following is a specification.

This invention has reference to an improvement in instruments for measuring angies and more particularly to an improvement in micrometer protrae-tors, bevel gages or similar instruments.

Mierometer prot actors or similar instruments as heretofore constructed, usually hare a multiplicity of parts for n'lierometrie adjustment, which wear outy easily and the instruments to contain those parts are heavy and cumbersome to handle, particularly for drafting or light machinists work.

The object of my invention is to improve the construction ol' a mieron'ieter protraetor or similar instrument, whereby the micrometrie. adjustment is simplified and the thickness and weight of the instrument reduced to a minimum.

further object of my invention is to provide a mierometer protractor or similar instrrunent with a detachal'ile key7 adapt'- edto operate the mierometrie adjustment ot' the instrument'.

.t still further object oi my invention is to reduce the cost of nlanulaetiuriner micrometer protractors or similar instruments.

lMy invention consists in the peculiar :old novel constrluftiml otE a` micrometer protractor or similar inst'run'ient, said instrulent havingl details of collstruetiol'l, as will l .nore i'ully set torth hereimitter and claimed.

Figure l is4 a top plan view ot: a protraetor provided with my improved micromelrie adjustment. Iiig, 2 is an edge view of the protractor. Fig'. 2t is an enlarged vertical sectional View through (he protraetor taken on line l 5l of Fig. 1. ltig. l is an enlarged detail View showing' the key-hole in the. initier-siete oli4 the protractor. Fia'. 5 is an enlarged detail sectional view taken on line 5 V ot` Fig. Il with the key in its operative position in the inst rumeni', and Fira-t3 is an enlarged detail sectional View ot' a modilied form of mieroim-trie zuljustment.

lh the dra \\'i|`|; js, rf, indicates the lal. body, 7; the' indicating disk, r: the movable blade, c! the \\asher, e the thumb nut', f the micrometric gear, and g the micromet-ric key of my improved micrometer protractor.

The flat body (L has a fixed bifureated blade 7, a circular head 8 with a central serew-tlneaded stud t), a concentric scale 10 and an oft-center key-hole 11 which extends through the head S in a predetermined position relative to the stud 9, as shown in Fig. 3.

The indicating disk has a beveled edge 12, an indicating,r line on the edge, a concentric circular depression 13 in its underside, a central hole 1l. and an arm 15 having a boss 1G in which is a hole 17 and secured radially to the disk in a position for the boss 1G to enter the hole 14 in the disk and `for the stud t) to extend through the hole 17 in the boss 16, thereby rotatably seeuring'the disk L to the stud t). The movable blade. o is detachably secured to the outer end of the arm 1:1 in any well known way. The washerd is placed on the stud i) over the arm and the thumb nut e (which forms a convenient means for handlingr the instrument) is screwed down on the stud t) onto the 'asher (I, thereby clamping the disk i) to the head S after adjustment. The micrometric gear has the central hole lSvtorthe boss lf3 aml is secured eoneentrict'llly to the disk in the. depression 13 by a pin 4or other means. 'lhe size of the gear f is such that the teeth on th(` gear will extend the depth of the teeth over the inner edge of the keyhole 11, as shown in Figs. Itandft. The key f/ has a knurled head l) .ircular flange 2U. and a stem 2l, the, id ofwhieh is formed into a pinion 22 aptedfto be inserted through the key-hole` ll in the underside ofthe head 8 aml mesh with the mierometric `gear f. as shown in Fig. 5.

ln the modified form, as shown in Fig'. (i, the pinion 22 has preferably a square hole 255 and is rotatably and permanently secured in the hole ll in a position to mesh wit-h the n 'ear j, and the key r/ has a square endI 2t adapted to enter the square hole 2&5 in the4 pinion 29..

rlhe movable blade r: is moved by hand for ordinary purposes to the angle required, indieated by the line ou the. disk l; and the seale l() on the head 8 and secured in the adjusted position by tightening the thumb nut; .,f. then `reater accuracy is required the blade r.' is moved approximately the ande wanted, thekey g inserted into the keyhole Il, thereby bringgfing,r the Vpinion 22 into mesh with the gear'f, and the key g is turned until the line on thedisk b indicatesV the rcquired degree or minute on the scale, when the thumb nut e is tightened and the key g removed from the instrument.

' By the use of my improved construction in micrometer protractors or similar' instruments, all ofthe part-s heretofore used for connecting or dis-connecting the micrometric mechanism are discarded, thereby simplitying the construction and reducing the thickness of the instrument.

I-Iaving thus described my invention, I claim as new and desire to secure by Letters Iatent;-

1. In a micrometer protractor, a stationary member'having an opening, a revoluble member superimposed on said stationary member, and means to actuate the re'voluble member including a key for operating said means, said key being removably insertible in said opening.

' 2. In a. micrometer protractor or similar instrument, a stationary member provided with a hole, a movable ,1 i'1ember, a micrometric actuating member intermediate the stationary and movable members and a detachable member adapted t-o engage With the micrometric acta-ting member through the hole in the stationary member.

'3. In a micrometer protractor or similar instrument, a stationary member provided with a hole, a movable member rotatably secured to the stationary member, a micrometric actuating member secured to the movable member intermediate the stationary and movable members, and a detachable member adapted to'engage with the micrometric actuating member through' the hole in the stationary member. Y

4. In a micrometer protractor vor similar instrument, a stationary member provided with a hole and having a fixed arm, a movable member rotatably'y secured, to the sta tionary member, an arm adjust-ably secured to the movablemember, a mlcrometric actuating member securedto the movable member intermediate the stationaryand movable members, and a detachable member adapted to engage with the micrometric actuating member through the hole in the stationary member.

5. In a micrometer protractor or similar instrument, a 'lat stationary member having a. key-hole, a fixed arm', and a scale, an indieating member rotatably secured to the stationary member concentric vWith the scale, an arm adjustably' secured to the rotatable indicating member, a gear secured to the rotatable indicating member intermediate the stationary and indicating members, and a detachable key having a pinion adapted to be inserted through the key-hole in the stationary member in a position for the 'pinion on the` key to mesh with the gear on the indieating member.

G. In a micrometer protractor or vsimilar instrument, a Hat stationary member having a fixed arm anda scale, an indicating member rotatably secured to the stationary member concentric With the scale, an arm adjustably secured to the rotatable indicating member, a gear secured to the rotatable indicating` 'member, and detachable means adapted to operate the gear, as described.

7. In a micrometer protractor or similar instrument, the combination of the following instrumentalities: a fiat body member` b having the fixed'blade 7, the screw-threaded 'ablysecured to the indicating dislrb, a

Washer d on the stud 9 over the disk b, a thumb nut e on the stud 9 over the Washer d, a micrometric gear f secured to thedislc b and a key g having a pinion 22 adapted to beinserted through t-he key-hole 11 inapesit-ion to mesh with the gear f, vas described.

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

LEON FUCHS, Witnesses: 'l

' ADA E. HAGERTY,

LUTHER D. BURLINGAMn

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