US2077192A - Emergency speed governor - Google Patents

Description

April 13, 1937. D. F. WARNER Er AL EMERGENCY SPEED GOVERNOR Original Filed Aug. 20, 1931 Inventors Donaid'FWarheT, Reginald G. Sbanderwick, by Wa/wZifiW/M The? Attorney Patented Apr. 13, 1937 PATENT OFFICE EMERGENCY SPEED GOVERNOR Donald F. Warner, Lynn, and Reginald G. Standerwick, Marblehead, Mass, assignors to General Electric Company, a corporation of New York Original application August 20, 1931, Serial No. 558,339. Patent No. 2,020,977, dated November 12, 1935. Divided and this application May 11,

1935, Serial No. 21,052

2 Claims.

The present invention relates to emergency speed governors and has for its object an improved construction of such governors to permit adjustment during operation. This application is a 5 division of our application, Serial No. 558,339, filed August 20, 1931 now Patent 2,020,977 November 12, 1935 on speed control mechanism. In said application we disclose a speed control mechanism for controlling and limiting the speed of a motor,

which mechanism includes a speed controlling element, a speed limiting element and means for automatically adjusting one of the elements in response to adjustment of the other element. To make this clear, let us assume we have a motor provided with a speed-controlling element or to operate at 1500 R. P. M.

A speed-limiting element or emergency speed governor of this kind must meet two requirements. It must be connectible to a speed-controlling element or speed governor and it must be adjustable during operation.

The single figure in the accompanying drawing shows an emergency speed governor in accordance with our invention. In this embodiment the speed governor is arranged to operate with a holding relay I6 which normally is energized to hold closed a switch ll forming a part of a motor circuit (not shown). The relay It has a coil connected to an electric source 10 through the intermediary of the emergency governor. The latter is driven by a shaft l8 forming a part of a variable speed motor (not shown).

As the speed of the motor reaches a certain maximum value, the governor interrupts the circuit for the energizing coil of the holding relay i6 which in turn permits the switch I! to open by the action of a spring i I.

The emergency governor comprises a spindle it which is fixed in an opening in the end of the shaft l8 and is electrically insulated therefrom by a sleeve 20 of insulating material. The outer end of the spindle l9 forms a yoke or fork 2| between the arms or prongs of which is pivoted an eccentric emergency governor flyweight 22, the pivot being indicated at 23. The upper end of the flyweight 22 is the heavy end and is in the form of a contact arm. 24. The weight 22 below the pivot 23 is provided with a conical bearing seat 25 with which engages a bearing cone 28 carried on one end of a tube The other end of the tube 21 is slidably mounted in a washer 28 of insulating material held in a sleeve or cylinder 29. Located between the washer 28 and a flange on the tube 21 is a governor spring 30 which presses the bearing cone 25 against the seat 25. The sleeve 29 is slidably mounted in a ring or contact cylinder 3| formed integral with the yoke 2?, that is electrically connected to the latter. Mounted on the slip ring Si is a second slip ring or contact cylinder 32 insulated therefrom by an insulating sleeve 33. During operation, spindle l9, yoke 2i, governor weight 22, tube 21, sleeve 20 and cylinders 3i and 32 rotate as a unit with the shaft l8. This rotating unit is located in a casing 34, the inner end of which is fastened to the end of a frame 35 of the drive motor. Mounted on the casing 34 are contact brushes 3% and 36:: which engage slip rings El and 32 respectively. In the end of the sleeve 29 is a thrust bearing ball 31 with which engages a rod member 33. The latter is adjustable in axial direction of the motor shaft. It may be connected to a speed governor as described in our parent application. With a certain adjustment the rod 38 causes a definite compression of the governor spring 30.

The circuit for the operating coil of the relay it is formed through the brush 35a, the outer ring 32, the fiyweight 2d, the yoke 2 I, the inner ring 3| and the brush 36. The circuit is closed as long as the contactarm 24 of the flyweight engages the outer ring 32. As soon as the speed reaches a certain maximum value, the centrifugal force acting on the fiyweight 22 causes outward movement of the contact arm against the force of the spring 3%. The arms of the fiyweight under such conditions are moved into a position indicated in dotted lines in the drawing, in which position the circuit for the relay i6 is interrupted causing movement of the switch H by the action of the spring I i. The speed at which interruption of the circuit takes place depends upon the compression of the spring 30, which compression may be regulated by axial movement of the normally stationary rod member 38.

Summarizing, the flyweight of our improved emergency speed governor normally closes an electric circuit through two ring members concentrically arranged with the spindle for the flyweight and rotatable therewith. The arrangement is simple in construction, reliable in operation and may be manufactured at small cost.

Having described the method of operation of our invention, together with the apparatus which we now consider to represent the best embodiment thereof, we desire to have it understood that the apparatus shown is only illustrative and that the invention may be carried out by other means.

What we claim as new and desire to secure by Letters Patent of the United States, is:-

1. An emergency speed governor comprising a rotatable spindle having an end portion forming a yoke, a flyweight eccentrically pivoted on the yoke, a metal ring secured to the yoke and in conductive relation therewith, another metal ring insulated from the first ring and rotatable therewith, said other metal ring being normally in conductive relation with the flyweight, a stationary casing, two brushes held on the casing, each brush engaging one of the rings, means for biasing the flyweight against the action of centrifugal force comprising a coil spring coaxially disposed within the inner ring, and means including a member supported on the stationary casing for adjusting the spring during operation.

2. An emergency speed governor comprising a rotatable spindle having an end portion forming a yoke, a flyweight eccentrically held on the yoke, a metal ring secured to the yoke and in conductive relation therewith, another metal ring insulated from the first ring and rotatable therewith, said other metal ring being normally in conductive relation with the flyweight, a stationary casing, two brushes held on the casing, each brush engaging one of the rings, means for biasing the flyweight against the action of centrifugal force comprising a spring coaxially disposed with the spindle, and means for adjusting the spring during operation comprising a cylinder bearing against one end of the spring, a stationary member coaxial with the spindle and supported on the casing and a thrust ball intermediate the stationary member and said cylinder.

REGINALD G. STANDERWICK. DONALD F. WARNER.

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