US400311A - Electric motor - Google Patents

Description

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ELECTRIC MOTOR.

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110. 400,311. Patented Mar. 26, 1889.

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UNITED STATES `leTENT OFFICE.

ETNA HYDE DAVIS AND REUBEN WESTERVELT, AOF ELMIRA, NEW YORK;

ELECTRIC MOTOR.

SPECIFICATION forming part of Letters Patent No. 400,31 l, dated. March 26, 1889;

Application ld September 4,1888'. Serial No. 284,568'. (No model.)

To all whom t may concern:

Be it known that we, ETNA HYDE DAvis and REUBEN WEsrERvELT, citizens of the United States, residing at Elmira, in the county of Ohemung and State of New York, have invented certain new and useful Improvements in Electric Motors; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Our invention has reference to electro-magnetic motors, and its object is to provide a motor of this class which shall apply the full force of the stroke of the armature every time the electro-magnet is operated. Heretofore the full force of the stroke has not been secured, owing to the fact that the magnet-circuit has been broken a considerable length of time before the end of the stroke was reached. We so construct our apparatus that the rupture of the circuit does not take place until the end of the stroke is nearly or quite accomplished. Moreover, we provide a novel gripping or clutching device, which enables us to increase the efficiency of our motor in other respects.

Our invention is illustrated in the accompanyin g drawings, in which- Figure l represents afront elevation of our improved motor, some of the parts being cut away for the sake of clearness. Fig. 2 is an end elevation of the same, and Figs. 5 and 4 show details.

Referring to the drawings by letter', A is the frame of our apparatus, and B an electrical magnet supported within the same. The magnet B is provided with an armature, C, whose lever extends from it at right angles, and is traversed at its outer end by a shaft, D, pivoted in the frame.

Rigidly connected with the shaft D is a disk, E, provided with a rim or flange, e, as shown. Also joined to the armature is a spring, F, which supports a notched bar,'f, the notch of which is angular and passes over the rim. This construction is clearly shown in Fig. 4:. Normally the armature is away from the magnet-poles, in which case the notch surrounds the rim, as shown in detail in the figure referred to. When, however, the arma'-v ture is attracted, it ls evident that the arm will carry the rim and the disk along with it, thereby causing the shaft D to rotate. On the opposite side of the disk is arranged a similar spring and notched bar, the spring in this instance being supported bya part of the frame A. The spring and bar referred to are lettered G and g, respectively, and the notched bar serves as a clutch or holder, preventing the disk from being returned to its original position on the back-stroke of the armature.

Below or behind the disk E s a smaller disk, H, of metal. On this disk bear from op-k posite sides two springs, h and 7L', one of which is supported by an insulatingepost, I, on the base-plate, and the other of which is supported on an insulating-block, J, also lo cated on the base. It will be observed that the disk H is cut away at one point and that insulating material is inserted. Theobject of this will appear hereinafter.

The armature O, or rather the armature-lever eXtendin g therefrom, carries a spring-arm, K, on the outer end of which is a yoke, L. Through this yoke extends a beam or arm, M, which is secured to a cen trally-pivoted lever, N. The lever can be adjusted, as shown, by means of a screw, O, which is located behind one end of the lever. The opposite end of the lever carries a conducting-point which normally makes contact with a spring, P, supported upon the block J.

The motor which we have illustrated is adapted for use in electrical circuits operated by a thermostat. The arrangements of circuits is shown dagrammatically in Fig. 1. Here the thermostat T is shown adapted to make contact with either post t or post t. Tracing the `circuit from the battery, we may suppose it to pass first to the insulated post R on the frame A, whence it passes to the magnet, and from there to the spring P. Leaving P, it normally goes to the lever N, which is in electrical connection to the frame of the apparatus. By these means it passes to the disk H, which is not insulated from the frame, and from there it goes either by the spring h or h back to the thermostat and the battery. lVhether it goes by spring h or spring 7L depends upon whether the thermostatic poweris in contact withtor t. lf with the former, then the circuit goes by h and the post S. If with the latter, then it takes the other course. It should be stated that the yoke L carries a little roller, Z, which travels under the beam M. In traveling to the limit of its motion it gradually presses harder and harder upon the beam, and when the limit is reached it lifts the beam and the lever far enough to break contact between the conductingpoint on the lever and the spring P. This being understood, the operation of the apparatus is as follows: The thermostat 'l is exposed to the varying temperature of some inclosed space. Under the influence of the temperature it will tend to swing into contact with one or the otherof the posts tand t. Then this happens, a complete electric circuit will be formed over one or the other of the courses described. The result will 'be that the electro-magnet will be energized, its

4armature will be attracted, the disk E will be partially rotated, carrying` the disk H with it, and the arm K will be swung, breaking the circuit when it reaches the limit of its stroke. Owingto the rupture of the circuitin this way the armature will vibrate back and forth, as in the ordinary if'ibrating bell, and the motion will continue until the insulating part of the disk H is brought under the co-opcrating spring which happens to be in circuit. It will be observed that the shat'tD is provided with a key-lever, X, by means of which it can be connected with a load or with any device to be operated. In the present instance we have shown it connected with a chain, y, with a damper, Y. It is evident that a half-revolution of the shaft will reverse the position of the damper and that another half-revolution will restore it. Itis also evident that the operation of our apparatus causes each time a l1alf-revelutionthat is, that the disk H, and consequently the shaft D, turns each time just far enough to bring the insulating portion of the disk into co-operation with the opposite spring, whether h or 71..

The details of a heat-regulating system operated by our motor do not form a part of the present invention, and they are therefore regarded as understood. It may be said, how'- ever, that the thermostat is supposed to be located in the apartment whose temperature is affected by the operation of the damper. In consequence the heat will be selfregulating. Our invention, however, has reference to the motor itself; and we lind in practice that, whereas heretofore the operation of valves and dampers by electric motors directly has been impossible, we are able with our apparatus to operate successfully heavy dampers and valves without the intervention of compressed air, clock-work, or any other motor.

Having now described our invention, what we claim isl. In an electric mot-or, an electro-magnet and its armature, and an arm attached to the latter and having a yoke which carries a roller, all in combination with an adj ustable pivoted contact-lever, within an opening in which the roller plays, asV and for the purpose set forth.

2. In an electric motor, an electro-magnet and its armature, and an arm attached to the latter and having a closed yoke which incloses a portion of an adjustable pivoted contactlever and is adapted to operate the same, as and for the purpose set forth.

In testimony7 whereof we aiiix our signatures in presence of two witnesses.

ETNA HYDE DAVIS. REUBEN VESTERVELT.

Witnesses:

STEPHEN W. TROWBRIDGE, Gi-nis. HALL ADAMs.

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