US169057A - Improvement in electric clocks - Google Patents

Description

2 Sheets--Sheet I. D. F. SWEET.

Electric-Clock. No, 169,057, Patented 0ct.19,1875.

WITNESSES IJV'VEJVTOR By 0 mm W C 1C x? I or'ney HOGRAPHER. WASHINGTON. p C.

m PETERS. PHOTO-Ll 2 Sheets--Sheet 2. n. r. swan.

Electric-Cluck. N0.169,057, Patented Oct.19,187 5.

UNTTED STATES PATENT OFFICE.

DANIEL F. SWEET, OF HASTINGS, MICHIGAN, ASSIGNOR OF ONE-HALF HIS RIGHT TO HOMER MOUL AND J. LEE REED, OF SAME PLACE.

IMPROVEMENT lN ELECTRIC CLOCKS.

Specification forming part of Letters Patent N 0. 169.057, dated October 19, 1875; application filed 1 September 14, 1576.

To all whom it may concern:

Be it known that I, DANIEL F. SWEET, of Hastings, in the county of Barry and in the State of Michigan, have invented certain new and useful Improvements in Electric Clocks; and do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accom panyin g drawings, and to the letters of reference marked thereon, making apart of this specification.

The nature of my invention consists in the construction and arrangement of an electric clock, as will be hereinaftermore fully setforth.

In order to enable others skilled in the art to which my invention appertains to make and use the same, I will now proceed to describe its construction and operation, referring to the annexed drawings, in which Figure l is a front elevation of my electric clock. Fig. 2 is a rear elevation of the same. Fig.3 is a plan view. Figs. 4, 5, and 6 are side Views of the only three wheels used in my clock.

A represents the frame of the clock, in a suitable part of which is a shaft, to, carrying upon its front end the second-hand B. ()n the shaft a is a sleeve, b, which carries on its frontend the minute'hand B ,and on the sleeve bis another sleeve, 01, which carries the hourhand B on its front end. 0 C and U are the three operating-wheels, secured, respectively, upon the shaft a and sleeves b d within the frame A. The wheel 0 is formed with sixty teeth, at equal distances apart, on its circnm ference. The wheel (3 has also sixty teeth, and the wheel 0 has twenty-four teeth. The wheel C is operated by a pawl, h, attached to a rocking lever, I), so as to turn said wheel the distance of one tooth at each stroke of the lever. ()n the side of the wheel O is a cam,f, which, once during each revolution of the said wheel, operates on an arm, k, hung upon a shaft, 0, in the top of the frame. To this arm is pivoted a second pawl, h which operates on the second wheel 0 so that for each revolution of the first wheel (1 the second wheel 0 is turned the distance ofone of its teeth.

The first wheel 0 being set for seconds, the second wheel b will, through the hand B indicate minutes. In like manner the third pawl it and two cams, ff, on the side of the wheel 0 be turned the distance of two of its teeth for every revolution of said wheel 0 The hand B connected to the wheel O will, therefore,be moved everyhalfihour the required distance. By having four cams on the wheel 0 and doubling the number of teeth on the wheel 0 the hour-hand will be moved every quarter-hour the proper distance. As soon as the pawls It [t have operatedtbeir respective wheels they are brought back to their proper position by means of springs '21 01, applied to the arms k is. To the lever D is attached the ordinary armature E, to be attracted by the electro-magnets Gr, and the upper end of said lever is forked, as shown in Fig. .4, to receive a pin, m, projecting from the ordinary escapement-wheel H, which is attached to a shaft, n, in the frame, and which shaft has the usual hair-spring I connected to it. In the same line as the axis of the rocking lever B is pivoted an L-shaped arm, .I, the horizontal part of which is below a set-screw,p, in a stand, K. In the vertical part of the arm J is fastened a fiat spring, 5, which extends up along the side of the armature-lever I), so that the balance wheel pin m will strike the end of said sprin The magnets G are connected with one pole of the battery, and the stand K with the other pole. The magnet is further connected with the metallic stand in which the lever l) and arm J are pivoted. \Vhenever the arm J is in contact with the set screw 19 the electric cit unit is closed, and as soon as the arm gets away from said setscrew the circuit is broken.

In operation, when the circuit is closed, the magnets at once draw the arnn-tture lever D toward them, whereby the first wheel 0 is turned the distance ofone ofits teeth. At the same time the crotched end of the lever, by the pin m the-rein, gives an impetus to the balance-wheel in one direction, and, while turning in that direction, the pin in is suddenly released from the spring 8, which spring, in its recoil, aided by the weight of the arm J. at once breaks the circuit. The return movement of the balance-wheel, caused by the recoil of the hair-spring, moves, by meansof the pin in, the lever I) away from the magnet, so as to set wheel will, by means of an arm, is, and l the pawl h. on the next tooth ot the wheel 0,

and the pin m will again pass by the upper end of the spring 8. As the balancewheel again returns, the pin m, entering the crotch of the lever D, carries the spring 8 forward until the arm J strikes the screw p, when the circuit is closed, and the magnets instantaneously attract the armature E, giving a renewed impetus to the balance-wheel. The wheels (3 G O are held from any back motion by means of pawls t, suitably arranged for that purpose. Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

In an electric clock, the combination of the DANIEL F. SWEET. Witnesses:

O. L. EVERT, JOHN SMITH.

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