US1916360A - Motor operating switch - Google Patents

Description

July 4, 1933. H, W CRANEl 1,916,360

MOTOR OPERATING SWITCH July 4, 1933. H. w. CRANE 1,916,360

MOTOR OPERATING SWITCH Filed Aug. 6, 1931 2 Sheets-Sheet 2 '1c-1 111111 1mm L t Patented July 4, 1933 UNITED sTATEs HERBERT W. CRANE, OF OAK PARK, ILLINOIS MOTOR OPERATING SWITCH Application led August 6, 1931. S'erial No. 555,523.

My invention relates to switches and particularly to a reversing switch adapted for use with door-operating motors.

An essential in successful operation of doors by motor control is a suitable reversing switch. Preferably the motor switch 1s operable by a low voltage relay, including a solenoid adapted to effect the necessary mechanical movement. In operations of this character in which the solenoid movement is always in the same direction and of the same extent, a switch should be provided in which the required positions are obtained with certainty and with a minimum number of parts.

I have found that successful operation is insured by the use of small mercury switches mounted for oscillation, the mechanism employed for effecting the required movement being very simple and designed for operation for an indefinitely long period without attention.

My invention will be more readily understood by reference to the accompanying drawings, in which:

Fig. 1 is a face view of switch mechanism constructed in accordance with my invention;

Fig. 2 is a plan view thereof;

Figs. 3 and 4 are views identical to that of Fig. 1 but with the parts in other operative positions, and

Fig. 5 is a wiring diagram.

Essentially the parts comprise a. base 10, a support 11 mounted perpendicularly thereon and a solenoid 12. A spring 13 connects the solenoid core with the outer end of a rocker arm 14 pivoted to the support. A pendulous member 15 is pivoted to the inner end of the arm 14 and is provided at its lower extremity with a member 16 having hook elements 17 18 on opposite sides of the central axis of the pendulous member. A pin 19 is located intermediate of the length of the pendulum and projects rearwardly for a purpose later to be explained.

A throw piece is pivoted for oscillation on an axis provided by the pin 2() fixed in the support 11, this piece having the function of moving the switch elements to the desired positions. The throw piece is provided with that is, the center of oscillation of the throw o piece. However, the portions of the wire arms from b to c are either straight or bent on a Very short arc, and arranged at an abrupt angle to the upper portions a, b

of the wire. These w1re arms, constituting in 65 effect a cam track, are engaged by eyes formed in the ends of arms 25, 26 rigidly connected to suitable frames and spring finger that carry the mercury switch tubes 27, 28 the tubes, which act as circuit closers 0 being adapted for oscillation in order to throw the mercury into and out of circuitmaking position. Flexible wirs 29, 30, 31 and 32 lead from the ends of the mercury tubes to suitable binding wires are connected from a source of power and to the windings of the motor 33. The low voltage circuit for operation of the solenoid is indicated at 34.

Also provided on the body 22 of the throw 80 piece are projections 35, 36, 37 and 38 arranged in arcuate outline; that is, they are laterally and vertically spaced relative to the center 20 of oscillation of the throw piece. These projections are in position to be engaged in proper sequence by the hooks 17, 18 on the pendulum.

Projecting lvertically from the body 22 of the throw piece is an arm 39 having a stop 40 at its upper end, which stop, in certain positions of the parts will contact the pin 19 on the pendulum preventing overthrow. A spring 41 extends from the top of the arm 39 to the lower end of the pendulum being conv nected thereto at the point 42. The spring 9 being under tension, its tendency is to swing the pendulous member according to the position of the throw piece. 4

The throw piece is maintained in adjusted position by means of the notches 43, in its 100 form. The two arms are posts from which lower edge, engaged by the roller 44 on the spring pressed arm 45. The lingers 46, 47 on the lower end of the throw piece are adapted to be contacted by the arm 48, that is directly connected through suitable links to the door mechanism thus acting as an automatic switch-throw when the door reaches lts respective limits of movement. Y

The operation is as follows: In Fig. 1 the parts are shown in a neutral position, that is, with neither of the switches in closed circuit condition. However, the pendulous member is so positioned that upon the next actuation of the solenoid, the arm 14 will raiseA Inasmuch as the hook 17 is positioned beneath the pin Q8, the elevation of the pendulous member will result 1n the oscillation of the throw piece to the position shown in Fig. 3. This causes the eye on arm 25 to ride into the portion b, o of the cam track and to result in quick throw ofthe mercury switch into the position shown 1n Fig. 3. However, the arm 26 will ride on the portion a, b of the cam track which is in the arc of the center of oscillation of the throw piece and no movement whatever of the mercury tube 28 can occur. Uponthe return of the solenoid to its starting position, the p endulous member will be lowered and the spring 41 will pull the pendulous member to the left into the position shown in lig. 3 with the hook 18 beneath the projection. Upon the next actuation of the solenoid the pendulous member will' be lifted and the parts sW11I 1g into the neutral position of Fig. 5; that is, with 'the arm 39 to the left of the center of the pendulous member. vThe pull of the the pendulum.

spring 41 will therefore place the pendulous member withits hook 18 beneath the pin or projection 35, and upon the next actuation of the solenoid, the parts will be thrown into the4 position of Fig. 4, that is with the contacts closed in the tube 28 and unchanged 1n the tube 27. This movement serves to cause pull of the spring to the right of the pendulous p member and results in positioning the hook 17 underneath the pin 37. Therefore` upon the next actuation, the parts will be returned to the position of Fig. 1 with both circuits open and with the parts in position to effect the closing of the circuit of the tube 27. Thus with identical movements of the solenoid arm, the` parts are sequentially moved into the respective closed circuit positions and to the intervening neutral positions. If movement of the throw piece is effected by the mechanically moving arm 48, the action is the same as that described.

It is obvious that the form of connection between the solenoid and the actuating pendulous member could be variedv widely also that the form of connection between the mercury tubes and the switch piece could be varied considerably. These and other modifications 'said cam track, and spring means connected are considered to be invention.

I claim:

1. In combination a support, a rocker arm thereon, means for actuatin the rocker, a pendulous member connecte to one end of the rocker said pendulous member having a hook at its extremity, a throw piece pivoted for oscillation on the support, said piece providing a cam track and having aseries of spaced projections on its face, a pair of circuit closers mounted for oscillation on the support and having arms in engagement with within the seppe of my to the throw piece and the pendulous mem- `ber act' to position the hook on the pendulous mem r relative to the projections on the throw piece. l

2. In combination, a support, an arm pivoted for oscillation thereon, a pendulous member connected to one end of the arm, said member having a hook thereon, a throw piece pivoted for oscillation on the support, said piece providing a cam track and having a series ofA projections arranged in laterally and vertically spaced relation on the body of said piece, a pair of 'switch elements, arms connected to said cam track and adapted to ei'ect movement of said switch elements, and means operated b the throw piece for positioning said pen ulous member vrelative to the projections on said piece.

3. In. combination, a support, an arm pivoted for oscillation thereon, a pendulous member connected to one end of the arm, said member having aY hook thereon, a throw piece pivoted for oscillation on the support, said piece having an arcuate ide member thereon, and said piece also aving a series of projections arranged in an arcuate line around the center of oscillation of the piece, a pair of switch elements, arms,means connecting the switch elements to the arcuate guide member, and means for positioning the endulous member to effect engagement of the hook thereof with said projections in sequence.

4. In combination, a support, an arm pivoted for oscillation thereon, a pendulous member connected to one end of the arm, said member having a hook thereon a throw piece pivoted for oscillation on the support, a throw piece having a body portion and an arm and being ivoted for oscillation on the support, said t row piece having a guide member, one portion of which is formed in an arc whose center is the center of oscillation of the piece, switch elements, means connecting the switch elements to the guide member` projections on the .throw piece, and a spring connecting the arm on the throw piece to the pendulous member for positioning the member for sequential engagement with said projections.

5. In combination, a support, a pendulous l member, means connected to the member for effectin reci rocation and permitting oscillation t ereo a throw piece pivoted for oscillation on the support, a cam track provided by the piece, a pair of mercury switches, arms for oscillating said switches, said arms being connected to saidv cam track, projections on said throw piece, and means operable by the throw piece for positioning the pendulous member to contact said projections in sequence whereby to effect oscillation of the throw piece.

6. In-combnation, a support, a pendulous member, means connected to the member for effecting reciprocation and permitting oscillation thereof, a throw piece pivoted for oscillation on the support, means providing a curved guide member on the piece, the arc of curvature of the guide member bein varied within its operative length, a pair o switch elements, arms connecting the switch elements to the guide member, projections arsignature.

HERBERT W. CRANE.

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