US1258574A - Mechanical instrument for dividing and spacing lines or dimensions and transferring scales from drawings. - Google Patents

Description

I A. JONES. MECHANIGAI. INSTRUMENT FOR DIVIDING AND SPACING LINES 0R DIMENSIONS AND TNANSFEHRING SCALES FROM DRAWINGS.

APPLICATION FILED JUNE 6. I916- Patented Mar; 5, 1918'.

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MECHANICAL INSTRUMENT FGR DIVIDISFTG TBANSFERHING- Application filed June 6. 1916.

To all im/ii 1/ may won/WW:

Be it. known that it. r'in'runn doses. :1 suhjeet ol the l lting o'l Great Britain. residing at Coventry. in the county o'l't lVarn'ick. l lngland. have inventwtl a certain new or l nnn'm'ml ivhclnznical liisorumcnt tor Ill." riding" and S aring; liincs or Dimensions and 'l ransi'erring tirales from Winnings. of which the following is a s meilicatioa.

This invention has for its object to prov de a simple and :u' urate mechanical instrumr-nt for dividing and s1 wine lines or dimensions. and. ti'ansh rrimr ilrs 'troin drawings. (hie oi the hie'l l, r invention the ability to work: to very small i'liinensions. such. tor instance. as one tenth oi u thousandth oi" an inch. The instrument is oi the kind having); a rule suitably graduated and a numhei' oil needles or nointm's winnected toggellwr h v trellis link, or lazy tongs mechanism.

in the accon'mairvin t drawings.

Figure l is a front elevation showing; part oi an instrument constriu'ted in acorn-dance with this invention. in order to show the instrument on a larn'c scale. part has been broken away.

Fig. 9. is a view at the ba ck plate showing the trellis mechanism and needles relatively arranged thereto.

Fig, is a front view oi part oil the in strument with the needles closed up. while Fin. 4: is a cross section on line 2? of Fig". 2.

Fig. 5 is a plan view oi? the left hand end, and

Fig. (3 is a similar view oil. the right hand end, While Fig. 7 shows an edge view and Fig. 8 is a front elevation oi the cursor which may be used.

Like letters indicate like parts through out the drawings.

The instrument comprises a front plate A and a back plate B suitably spaced, as by means of spacing blocks A and connected together by screws (1. or the like so as to leave an intermediate space. The front plate is graduated or divided in any suitable manner. For instance. at A a certain length, say 12 inches. may be divided and graduated in fractions of an inch. At A the same length may be divided into decimals or tenths of an inch. Sliding 0n the front plate is a cursor C by Which readings can he 1.1) SPAGING LINES OB DIMENSIONS ANT) i 5 FROM DRAVIINGEL Patented Friar. 5, 191.8.

Serial No. 102.002.

accurately made. The cursor, as can be seen in F 3 and 7 catches onto a dove-tailed edge a oi? the rule. It is used for reading from the markings. i

l ioii'ated between the two plates is a series oi? needles D, D, D D. The needle D at the left hand end is a fixture. but the SUl)S(" quent needles I) are connected with. one another by means oi. links if) pivotally connected together in the form ot a trellis. At each pivotal connection between the ends oi the links there is a sliding connection with the needles D. For instance, sliding on the exterior of each. needle may be a sleeve or block hi pivoted to the trellis mechanism, the an rangement beings; such, that when the needles are moved the}; travel through distances which are proportiomll to the position which each ociizunies in relation to the fixed new die D For instance, if the extrinne needle l) is moved an inch. and ii? here are 10 nee-- dies the lil'st one D moves one tenth of an inch. the second, two tenths. the third three tenths. and so on.

Thus in reducing from one scale to a smaller the extreme needles D and D are se nu'ated the amount of a certain. dimension on the large scale. and it the required re duction is in he say. one half, the space between the first and the fifth movable needle marked oil' on the reduced scale. It the reduction is to he three-fifths the sixth movable needle is used. the distance between that and the [iXed needle D being exactly six-tenths oi? the distance between the extreme needles D and D In transferring on to a larger scale the reverse proc ess is followed.

It will he noticed that the points D" of the needles are beveled oil in two directions. Figs. 1, 2 and 3 show the beveling in one direction, and the taper in the other direc tion. is clear from Fig. l.

Any suitable means may be employed for fixing the extreme needle I) in the required position, as shown. In Figs. 2 and 6 there is shown. attached to this needle a screw G which passes through a slot 13 in the back plate and also through a clamping block H. When the nut G is tightened up the needle U and the block H are drawn together and the needle D is clamped to the back plate B. In conjunction with this block H there may be used a micrometer device for Ininu'tely adjusting the needle D This consists as shown in Fig. 6, of second clamp ing block J with a clamping screw J havinga. nut J and passing between the blocks H and J is a screw K carrying a knurled disk or the head L. Above the periphery of this disk L may be a pointer M, which is visible in Fig. 4-, but which has been omitted :trom Fig. 6 for the salre of clearness. If the screw K is provided with forty threads to the inch and it the periphery of the disl: L is divided into twentydive parts it is possible, in the well-known manner, to move the block H accurately through a distance 0t (111(3-tl10l181t11fill1l1 of an inch by first clamping the block .l to the base plate B and turning the dish L through one division. marked on its edge. If the needle D is in this manner moved through one thousandth of an inch the first movable needle l) next the needle I) is moved through one-tenth of a lil101lsandth of an inch. I

It will be clear that when the needles are closed together as shown in Fig. 3 their points are separated a certain distance, which for instance may be one tenth (a an inch. In such a case when. it is desired to measure distances of less than this amount there is provided a second fixed needle N shown in Figs. 1 and 9 This lies iin1nediatcly behind the first movable needle I) when all the needles are closed up. WVhen thereto-re the extreme needle D is moved through one thousandth of an inch the needles D and N, which previously were superposed, will separate one tenth of a thousandth of an inch.

The lower points D of the needles may be suitably shaped to suit screw threads to enable the reading of these to be very easily ascertained.

What I claim as my invention and desire o secure by Letters Patent is 7 in said back plate for locking the extreme needles, and a cursor sliding on said graduated front plate, substantially as set forth.

In combination a slotted back plate, a graduated front plate attached thereto and spaced therefrom, trellis link mechanism between said plates and anchored at one end to one of said plates, a needle fixed relatively to said plates, movable indicating needles between said plates, a sliding connection between each of said needles and a pair of said trellis links, means passing through the slot in said back plate for locking the e treme needles, and a cursor sliding on said graduated front plate and a micrometer adjustncent between said locking means and said extreme needle, substantially set forth.

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

ARTHUR JONES. Witnesses ALBERT Snaonnnron, LEONARD Jones.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

' Washington, D. it.

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