US458746A - Patrick blackie - Google Patents

Description

(No Model.)

P. BLAOKIE 8v J. NISBET.

MECHANICAL MOTIUN.

110.458,74@ Patented Sept. 1, 1891.

UNITED STATES PATENT OEEICE.

PATROK BLAOKIE, OF REDFERN, NEAR SYDNEY, AND JOHNNISBET, OF OOOLABAH, NEV SOUTH VALES.

MECHANICAL :vio-HON.

SPECIFCATION forming part of Letters E'atent No. 458,746, dated September l, 1891.

Application filed October 13, 1890. Serial No. 368,047. (No model.)

.To all whom t may concern.-

Be it known that we, PATRICK BLACKIE, engineer, residing at Redfern, near Sydney, inthe British Oolony of New South Vales, and JOHN NISBET, grazier, residing at Coolabah, in the said British Colony, both subjects of the Queen of Great Britain, have invented a new and useful mechanical motion entitled An Improved Mechanical Motion, of which the following is a specification. This invention relates to an improved mechanical motion which has been devised specially to provide compact gear for converting rotary into reciprocating motion and at the Sametime multiplying or increasingthe speeds or number of strokes of the one in relation to the number of revolutions of the other. Nhile this motion is suitable for converting rotary into reciprocating motion, yet it may be found useful for the conversion of reciprocating into rotary motion if the latter be provided with means for overcoming deadpoints or dead-centers. This motion is especially useful for converting the motion of the revolving spindle into the :reciprocating motion of the cutters in sheep shearing machines; but it may also be applied in machines for other purposes.

This improved mechanical motion is comprised in the combination and arrangement, with a female starorpeculiarly-recessed disk, or, as we term it, a femestaig of a male or tongue, oryas we term it, a diametang, gearing in and with the recesses of the female star, and adapted the former to revolveand the latter to have reciprocating motion.

In order that this invention may be clearly understood,we will now describe the saine with reference to the drawings herewith, in which- Figures 1 and 2 are a section and a plan, respectively, of the improved mechanical inotion, the reciprocations being to the revolutions as three to one. Fig. 3 is aface view of the femestar and a section of the diametang of the same. Figs. t and 5 are diagrammatic plans showing designs or drafts of the im proved mechanical motion; and Figs, 6 and 7 are views similar to that in Fig. 3, but in these cases the ratios of speed of reciprocat-ions and revolutions are live to one and seven to one, respectively.

A is the revolving spindle; B, reciprocating lever; O, femestar, and D diametang.

A is the bearing; B', fulcrum; O', outer angles; O2, inner angles, and D extremes.

In operation, should spindle Abe revolved, the lever B will be reciprocated on fulcrum B by the action of the inner angles C2 upon the curved surfaces of the diametang D, impellin g it to turn or revolve; but as it can only move horizontally it is thrust backward and forward by the wedging action of the contact of said inner angles O2.

The peculiar recesses of the femestar are set out as follows: The stroke and length of the diametang being determined, we draw two straight lines a and b at right angles, and upon one of them a set out the length of the dia1netang,as at points c. Now with a radius equal to half the length of diametang less half the strokeacircle d., termed themo tion circle, is drawn, which circle is equally divided into the same number of parts (as three, five, seven, dac., or other uneven nurnber) as angles are required in the femestar. These divisions, one of which must be upon line Z) at right angles to the length of the diametang, are marked c and iiX the internal points of the femestar. The curve of the diametang is now ascertained by drawing a circle cutting the extremes or points cand the two of the points e, respectively, nearest to points c on either side of line b, and thus obtaining center f.- Tith the same radius and from centers f equidistant from the main center and equidistant from each other the remaining curves of the femestar and diametan g are drawn and the whole finished with a cir cumference g, drawn through the outside points Zi, Where the circles meet.

The design or draft just described is correct where the reciprocation is in a straight line, and is also suitable where reciprocation is a rocking motion from a near center, as in small gears, in which case the necessary concavity of the disk is small and would give little variance; but where there is longer reciprocation or more concavity of disk in design ing and drafting the femestar allowance would have to be made for the same.

Having now particularly described and eX- A plained the nature of our said invention and the manner in which the same is to be performed, we declare that what We claim isl. The improved mechanical motion coinprised inthe combination and arrangement, With a shaft A, of the star-recessed disk or femestar C, adapted to revolve With said shaft, the reciprocating lever B, and the tongue or male or diametang D, fastened to said lever B and adapted to gear in said femestar and to reciprocate the leverl, substantially. as set forth.

2. The improved mechanical motion co1n prised in the combination and arrangement, with a shaft A, of the star-recessed disk or femestar c, adapted to revolve With said shaft, the reciprocating lever B, and the tongue or male or diametang D, fastened to saidleverB in line With said shaft A and adapted to gear in said femestar and to reciprocate the lever 2o B, substantially as set forth.

3. Inan improved mechanical motion, the combination consisting of the shaft A, the star-shaped disk or femestar c, fastened to said shaft and having angular projections, and the male or diametang D, having ellipticallyshaped surfaces geared in said feinestar and adapted to be moved laterally by the action of the angular projections upon the elliptically shaped surfaces, substantially as set forth.

vIn witness whereof We have hereunto set our hands in presence of tWo subscribing witnesses.

PATRICK BLAcKIE. JOHN Nrsnr.

Witnesses:

N. P. SHERMAN, THOMAS JAMES WARD.

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