US291893A - Mechanical movement - Google Patents

Description

2 Sheets-Sheet 1. I

Q (No Model.)

. M. GEORGE.

MECHANICAL MDVEMENT.

No. 291,893. Patented Jan. 15, 1884.

WTNE-SSES (No Model.) 2 Sheets-Sheet 2 E. M. GEORGE.

MECHANICAL MOVEMENT.

Patented Jan. 15,

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r4. PETERS. Pholo-Limagnpmr. Walhingian. n. a

Ururnn STATES ATEN'I tries.

EMANUEL M. GEORGE, OF THREE RIVERS, MICHIGAN NIECHANICAL MOVEMENT.

SPECIFICATION forming part of Letters Patent No. 291,893, dated January 15, 1884,

Application filed October 1, 1863: (X0 model.)

L'b all whom it may concern.-

Be it known that I, EMANUEL M. GEORGE, of Three Rivers, in the county of St. Joseph and State of Michigan, have invented'new and useful Improvements in Mechanical Movements; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, which form a part of this speci fication.

This invention relates to certain new and useful improvements in devices for overeonr ing the dead-centers of machinery when power is applied thereto, and which will prevent the same under all circumstances from rotating in the opposite direction in which it should rotate to perform its proper functions. Said device is also made adjustable, so that it may be applied alternately to machinery rotating to the right or to the left by the use of the same elements, but reversed in position, as more fully hereinafter described and claimed.

Figure l is an elevation of my device as attached to the crank-pin upon the drivingwheel of a sewing-machine, the cap being removed to show the interior construction. Fig. 2 is avertical central section of the device dctached and on a larger scale, and Fig. 8 is an enlarged side elevation on the same scale as Fi 2, and with the cap-plate removed.

In the accompanying drawings, which form a part of this specification, F represents the frame, G the fly-wheel, H the pitman, and I the treadle, of an ordinary sewing-machine to which my device is shown attached. A rep resents a case which incloses the mechanism, and which is designed to be rigidly secured at its lower end to one end of the pitman H, whose opposite end is designed to be secured to the treadle I in any desired manner.

In the back wall of the case A there is a vertical slot, a, through which the crank-pin B projects into the case. A slide, 0, shown partially in dotted lines in Figs. 1 and 3,) is sleeved upon the projecting end of the crankpin, and its length is equal to the interior width of the case, by means of which such slide is guided in its movements as though running on guides. Springs D, of any, suitable construction, are interposed on either side of such slide, finding their points of resistance dition by the springs upon being relieved from such pressure.

E is a ratchet-wheel secured against the face of said slide upon the inwardly-proj ecting end of the crank-pin in any desired or suitable manner.

0 is a 'pawl sleeved upon the pin Z) in such manner that when the device is in position such pawl will, by its gravity, always be in engagement with the ratchet.

d is another pawl, sleeved upon the pin 1), diagonally opposite the pin 1), to which the pawl c is attached. This pawl 61 is overweighted at its lower end, so that when the device is in position the end of the pawl will at all times be found in engagement with one of the ratchet-teeth diagonally opposite the engagement therewith of the pawl 0. Now, if

the machine has stopped with its crank at a deadcenter, so that operating the treadlc would not start the machine, it is common for the operator to overcome such dead-center by the hand. One object of my invention is to avoid this, because it is so constructed that when in this position the pressure exerted upon the treadle exerts through the pitman a pushing or pulling motion to the case, which the slot in itsrear wall allows to be done, and this changes slightly the relative position of the ends of the two pawls with relation to the ratchet, or, rather, compels the ratchet to turn by its contact with the ends of the pawls sufficiently to overcome the deadcenter, and as soon as this result is attained the spring, actuating the slide upon the inner projecting end of the crank-pin, compels the case to resume its original position. It will readily be seen that while this result is accomplished the peculiar location of the pawls with relation to each other and the ratchet prevents the rotationof the shaft except in the desired direction. Should it be desired to use the same device to secure the running of the shaft in an opposite direction from that already described, it becomes simply necessary todetach the ratchet-wheel and reverse its position, at the same time changing the pawl c to the opposite pin 1), and the pawl d to the opposite pin b.

I do not desire to confine myself to the exact construction herein shown, for a number of ways occur by which these results may be attained, and which, in my opinion, cannot be employed without coming within the spirit of my invention.

Vhat I claim as my invention, is

1. The combination, with a crank or its equivalent and its operating device, of mechanism, substantially as described, connected to and carried by the operating means and traveling in an orbit the center of which is the center of the cranks motion, and coin structed to overcome the dead-center of said crank, as set forth.

pins b b, and pawls c d, the parts being con- 0 structed, arranged, and operating substantial] y as and for the purposes set forth. i

EMANUEL M. GEORGE.

Witnesses:

H. S. SPRAGUE, E. W. ANDREWS.

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