US1629989A - Reverse control for motors - Google Patents

Description

1,629,989 M. BROWN REVERSE CONTROL FOR MOTORS May 24, 1927.

Filed Aug. 22, 1925 242 ZZ\ 17 lllffllllkmllm 171 .2. i5 Z1 15/ J4 9 W! W I 16 0 Z9 Z0. 1 V 10 5/ 164 19 J? Imam/Z 071 [Wax 570x070,

. be cheaply manufactured Patented May 24, 1927.

UNITED STATES PATENT OFFICE.

MAX BROWN, or CHICAGO, ILLINOIS.

REVERSE CONTROL FOR MOTORS.

Application filed August 22, 1925. Serial No. 51,885.

My invention appertains generally'to a motor reverse control, and more particularly lo such a control for electric motors employed in connection with the operation of throingh the neutral position to the other extreme position, such quick movement of the lever causing a too rapid reversal of the electric motor and frequently causing series damage thereto. A sudden reversal of the direction of current in the motor armature by such rapid and uninterrupted movement of the control lever will blow out fuses; will stop the elevator out the motor arn'iature; and will cause arebetween floors; will burn ing in switches and across the motor commutators, all of which, obviously necessitate expenditure for repairs and cause needless delay.

The main object of my invention, accordingly, is to provide an interrupting and retar-ding means for control levers of the class described, which will prevent a rapid reversal of the motor, by causing the lever to come to a substantial rest in neutral position.

Another object is to provide a simplified control box embodying a lever interrupting and retarding means for the purpose mentioned. 7

Still another object is to provide such an interrupting and retarding means which may and may be readily fitted to standard controls now in use.

Other advantages and objects will be apparent to those skilled in this art as the description hereof progresses.

These objects are accomplished by the improved control means hereinafter described and which including an independently movable operating handle carried on a lever pivotarllyv inounted on the box, said lever carrying a guide in the form of a roller member, the lever being movable to close contacts for operating a motor to raise or lower an elevator or lift. Mounted on the control box in the path of movement of the guide or roller, and in the neutral lever, there is guide plate embodying fea- .tures for interrupting the continuous movement of the lever to retard'it and prevent rapid reversal of the motor.

terrupting and retarding briefly embodies a control box at 23 in Fig. t so they position of the.

In the accompanying sheet of drawings, to which reference should now be made, and wherein like parts are denoted by like'reference characters, I

Fig. 1 is a face plain box and lever showing view of a control the improved inmeans in position; Fig. 2 is a top plan view. ofthe same mechanism;

Fig. 3 is a vertical sectional view through the control box and operating handle or lever and is taken alongthe line 3-3 of Fig.1,

looking in the direction of the arrows;

.Fig. 4: is a perspective view of the retarding means or guide plate and Fig. 5 is a top plan view of said plate. Looking to Figs. 1, 2 and 3, there is illustrated a conventionalface member 10 of a control box of the type mentioned, said member being rounded in the usual way alon its upper edge and centrally and pivotally carrying on a pivot 11, the usual lever 12 adapted to be swung either to the right or to the left as is common in this art. integrally formed on the lever below its pivot is the customary segmental contact 13 engageable with the contacts 14 01 15 for closing the circuit with the motor to operate the lift in either an up or a down direction. I

The member 10 carries on its back side and centrally thereon at its top a plate 1.6 to which is bolted the improved retarding and guiding plate l7 of this invention, said plate restingon the top side of the member 10, as shown. This guide member 17 isprovided with a centrally disposed pocket 18 con'imunicating with an olfsetpassageway 19 arranged forwardly thereof and extending to the right shown, said passageway being closed at one end and merging into a camming or guide face 20 at the opposite end "where said passageway is open. Similarly, there is disposed rearwardly of the pocket 18, an oppositely disposed passageway 21 also closed at one end and open at the other end, where there is another camming or guiding portion 22. The camming portions 20 and '22 are preferably rounded at their upper edges as indicated generally better perform their guiding function as will presently appear. Centrally disposed inthe pocket 18 there is arranged a pair of yieldable, spaced, stop members 24L for a purpose soon to appear. The lever 12 carries in any suitable manlit) ner, a forwardly projecting operating handle 25, centrally and axially bored out to receive a plunger 26 made fast on the lever 12 in a manner, by means of thespring 27, to permit an independent or relative movement of the handle 25 with respect to said lever 12. The handle is provided with a roller 28 having a guide flange 29 so disposed that it may pass through the pocket 18 and passageways 19 and 21 in the guide plate 17. A collar 30 holds the roller 28 in place.

In the operation of this control means, let us suppose the lever 12 is swung from the far left hand dotted position in Fig. 1 towards the right to reverse the motor and the direction of movement of the lift. The guide flange 29 and roller 28 move with the handle 25, the flange entering the passageway 21 and being guided thereinto by the cam face 22, the roller 28 and flange 29 having a rolling contact with the round edged cam face to reduce shocks. The handle 25, of course, has an independent movement due to the plunger and spring construction shown. The handle will be interrupted in its continuous movement by the closed end of the passageway adjacent the pocket 18, and the operator to continue the movement must then pull the handle outwardly across said pocket with the flange 29 furthermore being yieldingly retarded by the means 24, and into the passageway 19 and then through said passageway to complete reversed position. The interruption and retardation by the offset passageways and yielding means 2% will be suflicient to bring themotor to rest to prevent its rapid reversal and thereby give assurance that carelessness will notcause damage to the motor with its consequent costly delays. F urthermore,if it is desired to retain the lever in neutral position the flange 29 will be held' locked yieldingly in such position against accidental displacement in all directions by the stop means 2et as shown in Fig. 3 and the ends of the pocket 18 as will be obvious. If it is desired to move thelever 12 from the extreme right hand position as viewed in Fig. 1, obviously the other cam face 20 comes into play to guide the roller 28 and flange 29 properly.

It will thus be seen that there is herein provided apparatus in which the several objects of this invention are achieved, and that the same is of simple construction, yet dependable in operation, and is well adapted to meet the exacting conditions of hard practical use.

IVhile I have shown the preferred form of the invention, it is to be understood that the same may be useful in other connections, and that various changes in form, construction and arrangement of parts may be resorted to without departing from the spirit and scope of this invention as hereinafter claimed.

hat I claim is:

1. In a reverse control for motors, the combination with the control box and lover, of an independently movable operating handle carried by the lever, and a guide plate disposed on the box including means for interrupting the continuous movement of the lever and yieldingly locking it in neutral position against accidental displacement in all directions.

2. In a reverse control for motors, the combination with the control box and lever, of an independently movable operating handle for the lever, a guide plate having otlset, oppositely disposed passageways for interrupting continuous movement of the lever through its neutral position. and yielding means arranged between the passageways for further retarding continuous movement of the lever.

3. In a guide member of the character described, the combination oii a plate having a central pocket, passageways on opposite sides of the pocket and communicating therewith, said passageways leading in opposite directions from the pocket. and yieldable stops arranged in the pocket.

4. In a guide member of the character described, the combination of a plate having a central pocket, passageways on opposite sides of the pocket and communicating tlierewitlnsaid passageways leading in 0pposite directions from the pocket and having their entrances provided with cumming surfaces, and spaced yieldable stops mounted in the pocket.

Signed at Chicago, in the county of Cook, and State of Illinois, this 18th day of August, 1925.

MAX BROWN.

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