US1471610A - Protective device - Google Patents

Description

oci. 23, 1923.

` J; F. JOY

PROTECTIVE DEVICE Original Filed NOV. 21 l1916 Patented Oct. Z3, 1923.

UNITED STATES PATENT oFFl-CE.

JOSEPH F. JOY, OF BELLE VERNON, PENNSYLVANIA, ASSIGNOR TOr THE JEFFREY MANUFACTURING COMPANY, F COLUMBUS, OHIO, A CORPORATION OF OHIO.

PROTECTIVE DEVICE.

Application led November 21, 1916, Serial No. 132,709. Renewed June 13, 1922. Serial No. 568,078.

To aZZ lwhom it may concern:

Be it known that I, JOSEPH F. JOY, a citizen of the United States, residing at Belle Vernon, in the county of Fayette and the State of Pennsylvania, have invented certain new and useful Improvements in Protective Devices, of which the following is a specication, reference being had therein to the accompanying drawing.

The present invention relates to certain new and useful improvements in protective devices and particularly that class of protective devices which are adapted to prevent certain abuses in the operation of electric locomotives.

It is common knowledge that when power is applied to the driving wheels of a locomotive suilicient to cause their rotation faster than the locomotive advances along the rails,

the adhesion of the wheels to the rails is ma.-

terially decreased and the tractive effort of the locomotive proportionately reduced. In their attempts to avail themselves of the greatest possible tractive effort while pulling heavy trains up gra des motor men habitually increase the power of the motors until the wheel slips. To reestablish the grip of the wheels upon the rails the power should be sufficiently curtailed to reduce the peripheral speed of the driving wheels to the rate of advance along the rails. In operating certain classes of electric locomotives the practice has developed of retarding the rotation of the driving wheels, when slipping, by the pressure of the brake shoes upon the treads of the wheels. This practice results in the extravagant consumption ot power, the undue straining of the motors and transmission gearing, and the wasteful wearing of the wheel tires and brake shoes.

It is the especial object of this invention to provide, in locomotives of the class described, devices which shall automatically revent the energizing of the motors when thev wheel brakes are applied.

rI`he devices by which I attain this object are fully set forth in the following specifiv cation and illustrated in the accompanying drawing of which- Fig. 1 is a side elevation of a locomotive of the class to which my protective device is applicable.

Fig. 2 is a plan view of thelocomotive shown in Fig. 1 the cover plates being broken away to reveal the brake mechanism and the application of my protective device thereto.

Fig. 3 is a diagrammatic figure showing the relation of my protective device to the electric circuits of the locomotive.

Like numerals refer to similar pants in the several figures.

In the drawing is illustrated a locomotive adapted to use in coal mines, and the like, having a frame composed of the side plates 1 and end plates 2 which are securely joined by connecting angles 3 and bolts 4. To the end frames 2 are attached the bumpers 5 which are provided with draw eyes 6 adapted to receivev the coupling pins by which the locomotive is connected with its load. The side plates 1 are mounted, in the usual manner, upon axles 7 to which are fixed the driving wheels 8 adapted to travel along the rails 9 of the mine track. Positioned between the side plates 1 are motors 10 upon the frames of which are formed journal bearings 11 which engage the axles 7 to support the motors. Suitable spur gears, not shown in the drawing, connect the armatures of the motors with the axles to drive them. A. trolley pole 12 is mounted upon the frame of the locomotive and adapted to contact with the trolley wire 13 to supply electric current to the motors. A controller 14 is connected between the trolley 12 and the motors 10 to control the operation of the motors in the manner common to electrically propelled vehicles. Suspended from the side plates l by the lever bars 15 and 16 are brake shoes 17 adapted to contact with the driving wheels in the manner common to wheel brakes. The lever bars 15 have extensions 1S by which they are connected through the links 19 with the levers 20, fulcrumed on the extensions 21 of the levers 16. The upper end of the levers 20 are connected through the links 22 with the equalizing bar 23 extending across the locomotive and slidable in the slots 24 of the side plates 1. Pivotally connected at the center of the equalizing bar 23 is a screw nut 25 in which is threaded a screw shaft 26 which extends longitudinally of the locomotive and is rotatable in an aperture of the cross bar 27 rigidly secured to the side plates 1 of locomotive frame. Attached to the shaft 26, outside the cross bar 27 is a hand wheel 28 by which the shaft may be rotated to cause its movement in the nut relative to the equalizing bar 23. By the rotation ot the hand wheel 28 in one direction the bralre shoes 17 will be forced into contact with the wheels 8 to retard th lr ro tation, and by the rotation ot the hand wheel 28 in the other direction the brake shoes will be moved away from the wheels. Formed on the hub of the hand wheel 28 is a flange 29 which is adapted to contact with the contact spring 3l) mounted upon an insulating,T base 31 supported on the cross bar 2T. This spring is connected by a conductor 82 with the actuating coil 38 of a contact switch 84 adapted, when current is liowing through the coil 38, to connect the conductor 85 trom the trolley 12 with the conductor 3G to the controller 14. By this arrangement olf parts, current will i'low from the trolley through the conductor 32, coil 83 and contact springr 30 to ground through the locomotive trame. When the above described circuit is closed the coil 83 will be energized to close the switch 311 allowing current to llow trom the trolley 12 through the switch 34 and controller 14 to energize the motors ot the locomotive. )a compression spring 37 is interposed between the hand wheel 28 and the cross bar 2'? which will be compress`ed whenever pressure is applied to the brake shoes 17 allowing the flange 29 to move away trom the spring 80, interrupting the circuit through the coil causing the switch 34; to open, interrupting the motor circuit and eftectually preventing the actuation of the motors while the brakes are set. 1When the pressure on the brake shoes is released the spring` 37 pushes the flange 29 rearwardly, restoring' the contact with the spring,` 30 to reclose the switch 8d. By the combination ol elements above described the application oi the brakes automaticall,v cut ott the current from the motors oi" the locomotive, electually preventing the straining ot the motors and transmission Egeaiingij, the eX- travapant consumption ot current and the wasteful wearing' ot the wheel tires and brake shoes.

lllhat 1 claim is- 1. ln a protective device oi the class described. the combination with a locomotive having' driving wheels, et ele-c ric motors to drive the wheels. brake shoes adjacent the wheels, means to press the brake slices against the wheels comprising' a screw shatt adapted to limited longitudinal movement. and means cont-rolled by the longitudinal movement ot the screw shaft to prevent the actuation of the motors while pressure is applied to the brake shoes.

2. in a protective device ot the class described` the combination with a locomotive havingr driven wheels, o'i electric mot-ors to drive the wheels, brake shoes adjacent the wheels, means to press the bralzc shoes against the wheels comprising a screw shat't adapted to limited longitudinal movement. an electrically actuated .switch adapted to interrupt the circuit oit the motors, and dcvices actuated by the longitudinal movement of the screw shatt to control the motor switch to prevent the actuation ot motors while pressure is applied to the brake shoes.

3. T he combination ot the wheels, the mo tor, the motor circuit, devices tor opening the circuit, the manually actuated rotatable and longitudinally movable shalt, means actuated by the rotary movement of the shalt to move the shoes against the wheels, said means being adapted to transmit the reactionary force Jr'rom the slices when pressing,r against the wheels and thereby actuating the said devices which open the circuit.

4. 1n a protective device ot the class described, the combination with an electric locomotive having drivingr wheels, oli electric motors for driving,r the wheels, means to retard the rotation ot the wheels, resilient means to actuate the retarding means. and means made ellective by the resiliency oi said actuating means to prevent the actuation ot the motor during' the actuation ot the retard ing means.

fi. ln a protective device ot the class described, the combination with an electric locomotive having,` drivingr wheels, of electric motors to drive the wheels, brake shoes adjacent the wheels, resilient means to press the brale shoes against the wheels, and means made effective by the resiliency ot the pressure exertingr means to prevent the actuation of the motors while the brake shoes are pressed against the wheels.

G. ln ay protective device ot the class dcscribed, the combination with an electric locomotive having drivingr wheels and an electric motor for driving the wheels` of brake shoes adapted to contact with the wheels, a shatt adapted to both rotary and bodily movement, means actuated by the rotary movement ci the shatt to press the brake shoes against the wheels, and means actuated by the bodily movement of the shaft to prevent the flow of electric current in the motor.

7. In a protective device ot the class de scribed, the combination with an electric locomotive having driving wheels and an electric motor to drive the wheels, of brake mechanism adapted to retard the rot-ation ol the wheels, and means actuated by the reac tionary pressure of the brake mechanism to prevent the flow of current in the motor.

8. In a protective device of the class described, the combination with an electric locomotive having driving wheels and an electric motor t0 drive the Wheels, of brake In testimony whereof T: affix my signature, 1n the presence of two Witnesses.

JOSEPH F. JOY.

Witnesses:

DUDLEY T. FISHER, HARRY C. DEAN.

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