US2384343A - Inside micrometer - Google Patents

Description

Sept. 4, 1945.

J. F. RO-NDINONE INSIDE MICROMETER Filed Jan. 21, 1943 1 N V EN TOR. JOSEPH J? Roma/NONE.

Patented Sept. 4, 1945 INSIDE MICROMETER Joseph F. Rondinone, Wethersfield, Conm, assign or of one-fourth to Winifred C. Rondinone,

Wether'sfield, Conn.

" f Application January 21, 1943, SerialNo. 473,087

Claims.

This invention relatesuto inside micrometers and has for its object to provide a micrometer formeasuring inside dimensions accurately and whichwill be easy to read.

. vA further object of -the invention is to provide an inside micrometer employing a standard type of micrometer mechanism which is very convenienttouse. p

Further objects of the invention will be more clearly understood from the following description and from the accompanvingdrawing in which:

Fig. 1 is a plan view-of ,an'inside micrometer embodyingmy invention. a

Fig. 2 is a side view thereof.

Fig. 33 is an enlarged-rear view of a portion of the device showing the mounting of the swivel connection.

Fig. 4 is a view-in central vertical section of the portion shown in Fig.3. v

Fig. 5 is a plan view-on an enlarged scale with parts shown in section on;line,55 of Fig. 2.

As shown in the drawing, my improved inside micrometermay employya structure similar to inside calipers which may consist of legs 5 and B that are pivoted at l and have measuring points 8-8.

My invention provides a micrometer construction which is attached to the said legs and consists of a conventional form of a micrometer mechanism having the usual graduated barrel 9 and the corresponding sleeve H] which operates the slide bar II in the well known manner that it is operated in the conventional form of micrometers.

A supporting member I2 is secured to the barrel 9 and swivelly connected to the leg 6, preferably by means of a screw M. The other leg 5 of the calipers is swivelly connected to the slide bar II by means of pivots, such as screws I5, which engage a swivel block H5. The end of the spindle II is reduced as at l1, extends through the said block l6 and is secured thereto by means of a screw l8 and a washer l9. A spring is provided, between the said block is and the shoulder 2| on the spindle H, and exerts a tension which forces the block l6 against the washer Hi. This construction eliminates lost motion in the connection between the bar II and the leg 5 and provides the clearance necessary to permit rotation of the spindle l l in the block Hi.

In the use of my invention, such as in measuring the inside of an opening, the points 88 are inserted in the opening and the sleeve I0 is then turned until the said points engage the walls of the opening or the points to be measured.

Contact between said points-or walls will be easily felt, through the resistance applied to the tuming of the sleeve lll just as the contact is actually made, for the reason that the spring 20 keeps the leg 5 always in engagement with the end of the spindle l l and eliminates lost motion, between said leg and the bar, which would otherwise tend to cause error in measuring for close dimensions.

In the construction shown, the graduations on the barrel 9 and the sleeve l0 are spaced according tor-the movement of the points 8--8 on a line indicated at 22, in thisucase; the ratio between the movement at the points 8-8 on the line 22 and the movement of the legs on the line 5--5 being two to one.. In other words, the points 8-8 will move one-half an inch while the legs will move only one-quarter of 7 an inch at the line 55. This will permit the use of a relatively short barrel 9 and sleeve in which is an advantage in the manufacture of my invention'as Well as in the use thereof. V

Error between the distances actually moved by the points 8,8 and those indicated .by the graduations on the barrel 9 is eliminated and the use of a variably graduated scale is rendered unnecessary by the fact that, in the operation of my improved micrometer, the line 22 and the line 5-5 are always in parallel positions regardless of the distances between the points 8-8 on line 22 and the pivots on line 5. Further, it is to be noted that the member l2 bridges around the leg 5 and that the pivoted block l6 moves between the pivot I4 and the barrel 9. Thus, the pivot for the block I6 retains the micrometer measuring mechanism with its axis always on line 5-5 and parallel to the line indicated at 22; thereby insuring accurate measurements by maintaining a constantly uniform ratio between the distances travelled by the points 88 on line 22 and by the pivots on line 5.

While I have shown my invention as applied to a caliper construction, the same may also be applied to various other forms of measuring devices without departing from the scope of my invention as set forth in the appended claims.

I claim:

1. An inside micrometer of the character described comprising a pair of pivoted leg members and a measuring mechanism carried on said members intermediate the ends thereof; said measuring mechanism including a supporting member pivotally connected to the side of one of said members and having a portion extending around the other leg member to the outer side thereof, and standard measuring means carried on said supporting member; said measuring means including a barrel having graduations thereon and mounted on the said portion of the supporting member, a Sleeve movable over said barrel, and a spindle movable with said sleeve and swivelly and rotatably connected to the said other leg member to thereby permit direct reading of the graduations on said barrel. p 3 4 2. An inside micrometer of theizharacter de-' scribed comprising a pair of pivotally connected leg members having a measuring mechanism mounted thereon intermediate the ends thereof; said measuring mechanism including a supporting member swivelly connected to the side of one of said leg members and having ,a portion extend ing around the other leg member to the outer side thereof relative to the first leg member, and standard measuring means carried "on thesai'd portion of the supporting member and including a spindle swivelly and rotatably secured to the other leg member to thereby permitdir'ect reading of g-raduations of said measuring ine'chani-s'ml 3; An inside micrometer comprising a caliper construction including apair'of pivotally connected leg members and a measuring mechanism; said mechanism including a barrel having a'sleeve movable thereover, a frame extending from said barrel and swivelly connected to one of said leg members-a block pivoted to the other legineinher, a spin-die movable with said sleeve rotatably connected to said-block for securing the said measuring mechanism" to said other leg member, anchoring means rotatably securing said spindle to said block, and spring means urging said block into engagement with said anchoring means to thereby prevent lost motion between the said block and spindle.

,ann inside micrometer of the character fl scribed including a 'c'aliper construction tempersing a pairpf pivotally ccnneetdle'g members, a supporting member secured to the'si'deof one of said leg members, ap'ortion 'Of said supporting member extending past the side otthe other leg member and having a bearing portion positioned exteriorly of said caliper construction and adjacent to the other leg member, a measuring barrel mounted on said bearing portion, a measuring sleeve movable over said barrel, a spindle connected to said sleeve and rotatable in said bearing portion and movable along the axis thereof, and means for securing said spindle to the other leg member,- s'aid means including a bill bf pivoting members threaded to said leg member and projecting into an opening therein, a pivoted member supported between said pivoting members and having an opening therein, a reduced portion on said spindle projecting through said opening in the pivoted member, anchoring means on the end of said spindle and abutting the side of said pivoted member, to retain it in position relative to 'sai'd'spindl'e; and a spring on said reduced portion urging said pivoted member against said anchoring means to prevent lost motion between the said spindle and-pivoted member v j 5. 4m inside micrometer comprising a caliper consisting of a pair of pivotally connected legs and a micrometer measuring meohanismbonnedt ed to the saideallp'ertor-im'eratin'g said legs, said measuring mecnamsm including a frame 'ekte'nd mg to one sweet said caliper and pivotaily connected to the leg member at the opposite: side of the eali'per and adapted to receive'the' other leg member for movement between the ends thereof, said frame moulding a measuring. mechanism having-a barrel bearmg standard gr'aduations thereon, said barrel being married by said frame, a measuring sleeve movable over said barrel, and amasiir-ing spindle operation with said sleeve and extending through said barrel and thirtvtalhr and swivelly connected to the said othet igme'fn be-r wherebvthe said 'sll'le'will move outwardly over said barrel upon the-opening of said eelipe'r and'mwardlv ever said barrelupon the closing of said caliper and thereby permit direct "reading or said gmduatiens. I Jasm n RONDINOHE.

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