US 1566460 A
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Description (OCR text may contain errors)
Dec, 22, 1925. wsbymso (I: W. WYMAN CONTROLLING SYSTEM Filed May 14 192a OFF ON o v @9221; 356d 4!) Patented Dec. 22, 192
Umrnn CHARLES W. WYI VIAN, OF CLAREMONT, ME AL HAIrIPSHZRE, ASSIGNOR TO SULLIVAN MACHINERY COM'PAIGY, A GQRPOBATZEH Git" MASSACHUSETTS.
Application filed May 14, 1923.
To all whom it may concern:
Be it known that I, CHAnLEs W. VVYMAN, a citizen of the United States, residing at Claremont, in the county of Sullivan and State of New Hampshire, have invented certain new and useful improvements in Controlling Systems, of which the following is a full, clear, and exact specification.
My invention relates to controlling terns, and more particularly to controlling systems for electrically operated mining mechanisms.
In many mines which are known as gassy mines, there is a sufficient amount of combustible gas at the working face so that it is dangerous to employ any mechanism at the face which could possibly, by reason of sparking or arcing, cause the ignition of the combustible mixture present. In mines of this type, by the use of alternating current motors in which the sparking resulting from commutation is avoided, it has been found possible to largely reduce the danger but in all commercial machines up to the present time it is still found necessary to employ a circuit making and breaking mechanism of some kind upon the machine and as a result, although these parts are very carefully enclosed, an explosion might occur were the casing opened or tampered with so as to permit access of the explosive mixture to the space within which sparking takes place. It is the object of my invention to provide an improved controlling mechanism in which, while controlling means is arranged upon the mining machine so that the latter may be controlled with all the customary convenience, still all circuit making and breaking mechanism is arranged as such a distance from the face that the danger of explosions is eliminated. Other objects and advantages of my invention will hereinafter more fully appear.
In the accompanying drawings 1 have shown for purposes of illustration one form which my invention may assume in practice.
In these drawings,-
Fig. 1 is a plan view of a portion of a mine showing a mining machine at work and a possible disposition of the controlling mechanism.
Fig. 2 is a simplified wiring diagram showing the circuits of the illustrative disclosure of my invention.
7 It will be observed that the mining ma- Serial No. $38,923.
chine 1 shown herein is working along a longwall face and that it is connected by a long flexible cable 2 with a box 3 and thence by other cable means 4 under control of a main line switch 5 with the power circuits i the main entry of the inine which is shown at 6, the distance between the chamber in which the machine is working and the parts 3, 4, 5 and 6 being under ordinary conditions blades 20, 21 and 22 cooperate with contacts 23, 24 and 25 to connect the lines 16, 1'? and 18 with wires 26, 27 and 28 which are arranged within the cable 2 and lead to the motor 29 upon the machine, it being evident that when the main line switch is closed, upon closing of the controller switch, the motor will be caused to run. The 'main control switch 19 is provided with an operating shaft 30 which carries the knife blades 20, 21 and 22 and which when caused to oscillate in the proper manner closes and opens the circuits of the motor. For the purpose of imparting the necessary oscillatory movement to the shaft 30 it is provided with a cross arm 31 to which there are secured a pair of armature elements 32 and 33 with which in turn there cooperate a pair of magnet coils respectively numbered 34 and 35, all this mechanism being located within the box 3. Wires 3'? and 38 are tapped off of the wires 17 and 18 within the box 3 and are arranged in the cable 2 within which they extend to the machine 1 and constitute a circuit through acoil 39 whose purpose will shortly become apparent. This coil is mounted for oscillatory movement with respect to a pivot 40 and may be moved in either direction from a central position by a control lever 41. The magnet coils 34 and 35 are connected together by a wire 42 at one end and this wire is connected by a wire 4 within the cable 2 to a Wire 43 connecting the ends of a pair of coils 44 and 45. The coils 44 and 45 are arranged radially with respect to the pivot 40. The
other ends of the coils i l and -15 are con nected by wires 5 .6 and 1-? also eznending through the cable 2 with the other ends of the coils 34 and 35. It will be observed that by reason of the alternating current flowing in the wires 37 and 38 the coil 39 will act as one of the coils of a transformer and will induce a current in the coils A and d5, which current will be equal since the resistance and other characteristics of the two halves of the, so to speak, balanced circuit including the coils 3-; and 35, 4a and 45 is equal.
From the descriptio so ia given the mode of operation of this mechanism will be readily understood. it 1 Le i; be assumed that it is de ed to start the motor. The switch 5 will be closed. The lever 41 will be moved a countencl Uvise direction about its p;;o-. 4-0. is a r the coil will be moved o position opposite the coil and the v small current which was previously induced in the coil dd will be further d Ainished, while that induced in the coil 45 will be largely increased. As a result the energisation of the coil 35 will be increased is that of the coil 34: will be reduced. ccordingly, the armature 33 will be strong y attracted while the attraction of the armature 32 will be diminished and the shaft 30 will be rocked to cause the knife switch blades 20, 21 and 22 to on the conta s 23, 24 and 25, and so current will flow 1 om the lines 10, 11 and 12 through the cs 26, 2'? and 28 and the motor will be operated. When is is desired to stop the motor, all that will be necessary will be to mo c the lever -l in the opposite direction a d, this having been done, the coil will then have the greater current induced in it and this current flowing through the coil will cause the armature 32 to the switch 19 to open position.
.ng the switch 19 it will be posto cause it to effect a series of move use of the m2" l1 1., J st connect the motor cgs 1n star and finally LO disconnect hem entirel loin too has, ap iopiiate latch. means being to eiiect this seuence oi opel atlol used to effect cirinent could ob *1 cult closing with spring or weight opening, also. It will be evident that instead so or" having the circuits to moving the switch directly controlled in the manner described herein, the coils and might control a relay which would control primary magnets i'ior operating the switch 19.
lVhile I have in this application specifically described one form which my invention may assume in practice, it will be understoed that this form of: the same is used for purposes of illustration and that the invention may be modified and embodied in other forms without departing from its spirit or the scope of the appended claims.
What I claim as new and desire to secure by Letters Patent is:
1. In a system of devices for controlling the transmission of power to an electric motor driven mining machine, a plural-part set of motor control devices, one part being mounted permanently on the mining machine and the other being connectible t0 the power circuit and being adapted to remain at a distance from the mining machine while the latter is cutting, said second mentioned part comprising all circuit making and breaking devices and electro magnetic means for actuating the same, and said first mentioned partconstituting means for inducing currents in said electro magnetic means.
2. In a system of devices for controlling the transmission of pow r to an electric motor driven device, a plural-part set of motor control devices, one part being mounted permanently on the driven device and the other being connectible to the power circuit and being adapted to remain at a distance from the device during operation thereof, said second mentioned part comprising all circuit makingand breaking devices and elect-ro-magnetic means for actuating the same, and said first mentioned part constituting means for inducing currents in said electro-magnetic means.
8. In a system of devices for controlling the transmission of power to an electric m0- tor driven mining machine, a plural-part set of motor control devices, one part being mounted permanently on the mining machine and the other being connectible to the power circuit and being adapted to remain at a distance from the mining machine while the latter is cutting, said second mentioned part comprising all circuit making and breaking devices and electro magnetic means for actuating the same, and said first mentioned part constituting controlling means for said circuit making and breaking devices comprising means for inducing current flow through the portions of said electro magnetic controlling means.
4. In an electric mechanism, a magnet coil, 2. second coil, said coils being connected in a closed circuit with each other, and a coil supplied with alternating current movable relative to said second coil to induce a current therein, said movable coil having an element associated therewith which has a tired relative position to said second coil.
5. In an electric controlling mechanism, a pair of magnet coils, a pair of coils connected one to each of said magnet coils, a single coil supplied with alternating current and movable relative to said second mentioned coils to induce currents therein and means for moving the same at will towards either of said second mentioned coils.
(J. In an electric mechanism, a pair of magnet coils, a pair of coils connected one to each of said magnet coils, and a single coil supplied with alternating current and normally disposed midway between said second mentioned coils movable relative to the latter to induce currents therein.
7. An electrical apparatus comprising motor controlling mechanism including an electro-responsive device, means for control ling current flow to said device including a plurality of coils, and means for inducing an electric current in one or another of said coils to eilect control of said motor by said device.
8. In an electric controlling mechanism, a plurality of pairs of coils, a coil su plied with alternating current adapted to in uence one pair of said coils to affect the other pair of said coils, and circuit controlling means oppositely actuated by said other pair of said coils.
9. In an electric controlling mechanism, a plurality of pairs of coils, magnetic generating means adapted to influence one coil or the other of one pair of said coils, and means whereby when one of said coils is infiuenced one of said coils in the remaining pair of coils will also be influence, said remaining pair of coils constituting switch gear operating means and respectively efi ecting establishment and interruption or" current flow.
10. In an electric mechanism, means for controlling a motor including electroresponsive means, and means for varying the current flow to said electro-responsive means as desired by the operator, said latter means comprising a coil, and a second coil supplied with alternating current and adapted to be moved relatively to said first mentioned coil to induce a current therein.
11. An electric apparatus comprising a motor control mechanism including an electric conductor, and means for varying the current flow through said conductor comprising a pair of coils and magnetic generating means adapted to influence one or the other of said coils.
In testimony whereof I affix my signature.
CHARLES W. WYMAN.