US823750A - Method of counterbalancing crank-wheels. - Google Patents

Description

PATENTED JUNE 19, 1906. c. .T. WBSILAKE. l

METHOD OF GOUNT-ERBALANGING GRA'NK WHEELS..-

APPLICATION FILED P3112. 1906.

To aZl w'hone'it may concern:

CHARLES T. WESTLAKE, or srLoUIs, MISSOURI, Assle-uos r'o DAVIS 'LOOOMOTIVE WHEEL COMPANY, OF ST. LOUIS,- MISSOURI, CORPO- RATIONQF DELAWARE.

marl-loo OF'COUNITEBBALANCING CRANK-,WHEELS.

I Specification of Letters Patent.

Application filed. February 12, 1906. Serial No. 300,820.

I Be it known that 1, CHARLES T.WESTLAKE, a citizen of the United States, residing at St. Louis, in the State. of Missouri, have invented a new'and Improved Method of Counterbalancing Crank-Wheels, of which the following is a specification. I i

jMy invention relates to an improved method of counterbalancing the weight of the crank-pin and its appurtenances in a crank-. wheel, and has for its object to obtain a perfect equilibrium of the wheel when so loaded during a complete revolution thereofon its axle in every position of the crank-pin.

According to the usual method of counterbalancing a crank-wheel when free to revolve on its axle and formed with a counterbalanceweight approximately equal to, but invariably, owin to inequality of casting, either greater or less than that required, a pin or bolt is tem orarily fixed centrally 1n the 'cran'k pin ho e, and from the outer projectin portion of the pin is suspended the actua weight of the crank-pin and its appurtenances. A similar pin is then fixed to the spokes of the wheel adjacent to its counterbalance-weight and at apoint diametrically opposite to the crank-pin, and from this pin or from that at v the crank-'pinhole (as the case may be) is suspended additional weight until the wheel balances: The amount of weight to be added to or subtracted from the counterbalanceweight can thenbe mathematically ascertairred. If the weight is to be deducted from the "counterbalance, the face of the latter is reduced by planing, and if to be added thereto sheet metal of the requisite weight. and cut to the outline of the' counterbalance is riv-' eted thereon. When the crank-wheeLis provided with two-counterweights, this method My invention consists in features of nov- *elty, as hereinafter described nd claimed,

reference being had to the, .ompanying drawings, forming part of this-specification,

.whereon v 1 igure 1 is an inner side elevation of-a loco ot i ve crank-driving wheel constructed. ac-

. nthereof on line 2 2 in'Fi 1, and Fig.3 anedge --view to reduced sc'a (broken away) showing the method of deterdmg to my invention; Fig. 2, a cross-seer e of the wheel;

mining the counterbalance weight required therefor. V

- Like letters and numerals of reference denote like parts inallthe figures.-

a represents a crank wheel having the the crank-pin (not shown) in the usual Wellknown manner. combined weight of the crank-arm b and its loaded crank-pin the wheel a is formed or provided, preferably near its circumference, at an equal distance radially from the arm I) counterbalance-weights c of equal wei ht, their aggregate weight being somewhat ess than that of the arm b and its appurtenances.

each counterbalance c and parallel to the j axis of the wheel a is formed a circular hole 2, which is described from a center line intersecting the center of gravit of the counterbalance a, and about theho e 2, at equal distances, respectively, from each side of a radial line passing through-the center of the hole 2 and throu h the axial center of the wheel a, are formei preferably in its inner side and partway through the counterbalance 0, one or more circular recesses orholes3, which are parallel to the hole 2,and symmetrically arranged relatively thereto and to each other.

For determinin the amount of extra for alancing the crank-arm 1 and its appurtenances the wheel a is mounted and free to revolve on its axis (Z. (See Fig. 3.) A temporary pin or bolt14 is then fixed in and proectscentraIIy from the crank-pin hole 1, and from the in 4 is suspended a-weight'fi, equal tothat o the said parts to be balanced. A similar each counterbalance c,'and from the pins '6 pm 4 or the w eel a balanced.

cles were concentrated at its center of grayityandas the holes 2 and 3 are arranged I the latter by fillinggo 3 uniformly on eac For counterbalancing the,

and" from each other. with preferably two Transversely through (or part waythrough) weight to be adde to each counterbalance c '8- al in the aggregate to the weight 5 on the katented June 1Q, 1900. i

crank-arm b, in which is formed the hole 1 for pin or" bolt 6 is fixed in'the hole 2 of ar suspended equal weights 7 ,which are ad- Now as a weight falls asthough its parti- IOO ,s'ymmetricall about the center of gravity of .each counter alanc'e c jany wei ht' added to artly fil 'n'gthe holes si" e of the hole 2 will act" "during a complete revolution of the wheel a on its axls d.

The advantage of my improved method over the ordinary method is the facility with which the adjustment is effected in adding to the counterbalance by filling the holes 3 instead of by riveting plates thereto. Also by applying the test Wei ht at the center of gravity of the acounter alance the necessity of calculating the required weight is obviated and the result obtained consequently more accurate and reliable.

What I claim as my invention, and desire to secure by Letters Patent, is-

The method of balancing a crank-wheel,

consisting in forming the counterbalance thereof initially of less weight than that of" recess in the counterbalance at each side of a radial line passing through the centers of the said axis and hole, the said recesses bein symmetrically arranged relatively to the sai hole and to each other, determining the extra weight to be added to the counterbalance by suspending weights respectively from the crank-Wheel at the center of its crank-pin hole, and from the counterbalance at its center of gravit and inserting the pro ortionate part of t 1e said weight within eac of the said recesses, substantially as described.

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

CHARLES T. WESTLAKE.

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