US306972A - Mechanical adjustment - Google Patents

Description

(No Model.)

N. O. STILES.

MECHANICAL ADJUSTMENT. No. 806,972. Patented 001;. 21 1884.

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PATENT NORMAN C. STILES, OF MIDDLETOWN, CONNECTICUT.

MECHANICAL ADJUSTMENT.

SPECIFICATIQN forming part of Letters Patent No. 306,972, dated October 21, 1884.

Application filed September 221884. (No model.)

To aZZ whom, it may concern/.-

] opening receives the crank-pin, audit the Be it known that I, NORMAN G. sums, of disk be held rigid in thehead of the pitman the Middletown, in the county of Middlesex and State of Connecticut, have invented a new Improvement in Mechanical Adjustments; and I do hereby declare the following, when taken in connection with accompanying drawings and the letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part p of this specification, and represent, in-

Figure 1, a perspective view showing the' graduated eccentric diskand pointer fixed on the pitman; Fig. 2, a vertical central section of the same; Fig. 3, a diagram illustrating the operation of the invention.

This invention relates to a device for adj usting a crank movement, whereby the extreme point to which the crank will throw the pitman may be varied. If the pitman be inadjustably attached to the crank, the throw of the pitman will be the same at both extremes; but by arranging a disk in the pitman having an eccentric bearing formed therein to receive the crank-pin, the adjustment of that eccentric to different positions will vary the extreme points to which the pitnian'will be thrown, but without varying the extent of throw. To illustrate: Let theline a b, Fig. 3,

represent the central line of the pitman through the crank-pin, d the crank-pin, andthe circle 6 the throw of the crank. The extent of the throw of the crank is therefore from the center f to the opposite point, h. Let i represent the end of the pitman at one extreme of the throw, and the line Z the other extreme. In the rotation of the crank the movement of the thing to which the pitman is attached will be as from i to Z, and if the crank be inadj ustably fixed in the pitman, then these two extreme points cannot be changed.

To make the extreme points of the throw of the crank adjustable, so that the thing moved may stop short of its extreme point Z, but without changing the throw of the crank, an eccentric bearing has been arranged in the head of the pitman for the crank-pin, as seen in Figs. 1 and 2, A representing the pitman, and B a disk arranged in the head of the pitman, having a hole, 0, through it parallel with its axis, but in an eccentric position with relat' n to the periphery of the disk B. This h e or indicated in broken lines, then the pitman.

will have been drawn upward, so that the extreme throws will be as to the lines at n, and the thing'moved by the pitman, instead of be ing moved as from t to Z in the first position, will be moved as from m ton, the throw or distance moved being the same, the extreme points only varied. The extreme variation is easily determined by setting the eccentric at either of, the said extreme positions,.and as seen in Fig. 3;but any variation of the throw other than this extreme, under the usual arrangement, can only be determined by trial,

-as in turning the eccentric from either exon the eccentric is turned, say, to the right to produce a variation to the extent indicated by the line 1-, the point 1) must be turned to the line 8; but' the same extent of adjustment from the line 8 as to the line tis made by a less movement of the eccentric, as indicated by the line a, and the movement of the eccentric to produce a change of equal extent decreases to the quarter-point o.

The object of my invention is to provide some means whereby the operator may know to what extent he is adjusting the pitman, or, rather, knowing that a certain amount of adjustment is required, he may understandingly adjust his pitman without the usual trials.

To this end my invention consists incombining with the eccentric and pitmanhead a graduated scale on one and a pointer on the other, the said scale graduated to indicate the decreasing movement of the eccentric from one extreme toward the quarter-point, and the increasing movement of the eccentric from that quarter-point to the other extreme to produce a constant variation in the extreme movement of the pitman, all as more fully hereinafter described.

My invention is best applied, as seen in Fig. 1, by a graduated scale on the face of the eccentric disk and near its outer edge, combined with a fixed point, D, on the pitmanhead. The divisions on this scale should extend one-half around the eccentric, and to start, say, as from one extreme of the eccentric, as at f, and extend to the opposite extreme, as at 71, the graduations diminishing in extent from one extreme to the intermediate point, and increasing from that point to the other extreme, according to the variation in extent required for movement to produce a given extent of variation in the movement of the pit man. This scale maybe divided, say, into one hundred parts, as shown, which will indicate the full extent of adjustment. This adjustment being, say, one inch, the workman making the adjustment knows if he moves the eccentric one point he has changed the extreme throw one one-hundredth of an inch, and so on. He is therefore enabled to adjust his eccentric with the utmost precision, and without the usual trials, which consume a very great amount of time in making such adjustment. The eccentric disk is best adjusted by providing its periphery with gear-teeth and combining therewith a pinion, E, through which the eccentric may be conveniently turned, and this adj ustment can be readily made while the machine is in operation, affording great advantage to the workman, as the pitman many times requires adjustment in the work. To stop the machine for such adj ustment consumes a great amount of time, because of the trials necessary, whereas by the employment of the graduated scale and the pointer he may make the adj ustmentwhile the machine is in operation, and without any delays, waits, or trials.

It will be readily understood that the scale may be either on the eccentric or the pitmanhead, the scale being on the one and the pointer on the other. I prefer, however, to make it on the face of the eccentric as being more convenient to graduate than the pitman-head.

This invention is applicable to many machines in which a crank movement is employed to convert rotary into reciprocating motion. One illustration will be suflicient to show its application to general uses where such adj ustment is necessary. Its use in a power-press enables the workman to adjust the descent of his tool while the machine is in operation, and with the utmost accuracy, or when introducing new or different tools, as punches and dies, such adjustment is necessary in order to bring the punches and dies in proper working condition,,and the adjustment is greatly facilitated by means of the graduated scale and pointer. I have illustrated the eccentric disk asfixed in its position by splitting the end of the pit man and combining therewith a clamp-screw, F, which binds the two parts together on the periphery of the eccentric, to securely hold it in any position to which it may be adjusted. Loosening the screw F frees the eccentric, so

, that it may be turned.

I claim- The combination of a pitman, the disk B, arranged in the head of the pitman, with an eccentric opening, 0, therein to receivethe crank-pin, the said disk made adjustable in the head of the pitman, the one provided with a pointer and the other with a scale graduated from one extreme throw of the eccentric to the opposite extreme, said graduations di minishing from one extreme to the intermediate point, and increasing from that intermediate point to the other extreme, according to the throw of the crank, substantially as described.

NORMAN C. STILES.

\Vitnesses:

I'IARRIS Manna, Gulls. XV. XVARNER.

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