US1149389A - Mechanical movement. - Google Patents

Description

J. E. MEGLEMRE.

MECHANICALMOVEMENT.

APPLICATION FILED JAN.ZI, 191s.

Ll fi e Patented Aug. 10, I915.

WITNESSES JNVENTOR.

- and are.

l JOHN El. MEGLEMRE, OF LINCOLN, NEBRASKA.

MECHANICAL MOVEMENT.

Application filed January 21, 1913.

To all whom it may concern Be it known that I, JOHN E. MEGLEMRE, a citizen of the United States, residing at Lincoln, in the county of Lancaster and State of Nebraska, have invented an Improvement in Mechanical Movements, of which the followingis a full, clear, and exact description. 7

This invention relates to'cam mechanism for converting continuous rotary motion into reciprocating rectilinear motion and is adapted for use in various types of maohiner'y in which the reciprocating members offer constant resistance in one direction of their movement and'are impelled with constant force in the opposite direction of their movement. t The object of this invention is to reduce to aminimum the variations in resistance to the driving force resulting'fromthe use of a liinited number of cams upon a drive shaft for reciprocating such members, thereby eliminating irregular and '.j erky movements and consequent wear and tear upon the driving parts, insuring smooth and noiseless operation and increasing the general ciliciency er the machine.

One embodiment of my invention in which these objects are attained is illustrated in the acco npanying drawings, in which- Figure '1 is a perspective viewof a double cylinder lift pump in which the plungers are driven by the improved cam mechanism. Fig. 2 is a dlagrammatlc view of the cam,

showing theirrelative arrangement and the positionofthe rollers actuated by the cams.

Fig. 3 is a face viewof the cam shown in .FigQ2.

In the accompanying drawings which show the improved cam mechanism applied to the driving shaft of the pump, the stationary support 1 has pivoted thereto, near its upper end," two swinging levers, 2 and 8. Pivotally connected to the swinging levers toward their outer ends are two upright I rods, 4 and 5.

Connected to the upright rods, at their upper ends, are the pump rods, 6 and 7, which operate in the pipes, 8 and 9.

Upon the outer ends of the swinging rods, 2 and, 3, are provided rollers, 10 and 11, which travel upon the faces of the cams, 12 and 13. Thecams l2 and 13 are attached to opposite faces of a disk, 14, which is fixed upon a shaft, 15. The shaft, 1 5, has a sprocket wheel, 16, fixed upon one end and a Specification of Letters Patent. Patg'ntqgd Aug, 1% 1915,

Serial No. 743,401.

'is driven from any suitable source of power, such as a water wheel, 17. I

The cams, 12 and 13, as clearly shown in Fig. 2, are each double armed cams, equal to size and shape, and are arranged with the faces of one of them ninety degrees in ad vance of the corresponding faces of the other, whereby each of the arms, 2 and 3, 'is elevated twice in one revolution of the shaft, 15, and alternate reciprocating motion is transmitted to the pump rods.

Refcrringvagain to Fig.2, each cam comprises two equal arms, 18 and -19, and each arm has an outwardly curved lifting face, 20, and an outw'ardly'curved lowering face, 21. The lowering face of one arm is connected with the lifting face of the other by an inwardly curved portion, 22, and the lifting face of each arm is connected with its lowering face by a sharply curved portion, 23. The lifting face of the cam has a rapidly increasing curvature in that portion leading away from the inwardly curved portion, 22, reaching the point of greatest curvature near the inner end of the arm, from which. point the curvature gradually de-' creases toward the outer end of the arm. Near the outer end of the arm, the curvature of the lifting face again begins to increase until. the sharply curved portion, 23, at theagainst the cam at all portions of their movements, but whendesirable, 'guides may be attached to the disk along portions or entirely around the periphery of the cam, forming with the cam'faces slots for the rollers to travel in. V

It will be seen, from theiabove description, that as the lifting face of the cam moves toward a roller, causing the roller to pass from the inwardly curved portion, 22,

. to the steepportion of the lifting face, the

roller will be raised with increasing velocity until the point of greatest curvature 'is reached, whereupon the roller will be ele vated with uniform speeduntil near the outer end of the arm, where, on account of the increasing curvature, the speed is gradually lessened preparatory to beginning the downward movement. The do nward run is so curved that the roller will be permitted to travel fora short distance with an accelerated movement and then with uniform velocity to nearly the lower end of its stroke,

when it is caught up and retarded by the inwardly curved portion, 22. By reason of this arrangement," during the greater'portion of the upward stroke, a very nearly constant lifting force is applied to the roller by the cam, and during the downward or return stroke, the roller 1 -y reason of the weight which it carries, will exert a nearly constant turning force upon the cam. When the two cams are arranged as shown in Fig. 2, the

constant force applied to the ascending rod is counterbalanced by the constant force due to the weight of the descending rod upon the lowering face of the cam, so that at all times except at the end of the strokes a constant load is imposed upon the driving shaft.

It will be observed from Fig. 2 that the lifting face, 20, of each arm of the cam is longer than the corresponding lowering face, 21, and consequently it will be seen that the camturns through an arc of more than ninety degrees in lifting the roller, and through an arc of less than ninety degrees in lowering the roller, so that the rod will fall with greater velocity than it has during the upward stroke. The main object of this, however, is to maintain an equal load upon the driving shaft during the change in dire'ction of the strokes of the two rods. The outer end of each arm of the cam is so curved that the velocity of the pump rod will be gradually decreased when it approaches the upper end of its stroke, and the 1 load, due to the other rod, decreases, thereby enabling the pump'rods to change from 1,14e,sse

their upward strokes to their downward strokes, and from their downward strokes to their upward strokes without causing a variation in the load imposed upon the drive It will be understood that the curvature of the various portions of the cam will def pend, somewhat, upon the conditions to be met with in the particular machine in which the cam mechanism is to be used, such as the ratio of. the force exerted by the cam upon the reciprocatingmember in one direction to the force exerted by the reciprocating member upon the cam in the other direction. However, from the above disclosure, any one skilled in mathematics and familiar with the principles of mechanics, can compute the curvature of the above described portions of the cam for the particular rnachine in which it is intended to be used.

I do not wish to limit myself to the exact construction shown, but believe myself to be entitled to vary the same Within the scope of the appended claim.

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

In mechanism of the character described, a shaft, a disk mounted upon the shaft, cams carried by the shaft and seating flatly against opposite sides of said disk and disposed within the lines thereof, the disk forming a plate separating the cams,each of said cams including a neck receiving the shaft and having enlarged relatively offset diametric radial arms formed thereon extending in opposite directions relative to the plane of the neck, the arms of each of said cams having oppositely presentedsinusoidal outer, edges intersecting at the points of the arms with the depressions of the edges of the arms of each cam arranged opposite each other at the neck therebetween.

in testimony whereof I hereby afiix my signature in the presence of two Witnesses. JOHN E. MEGLEMRE.

Witnesses:

,HENRY A. MEIER, O'rro W. MEIER.

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