US1586953A - Switch mechanism - Google Patents

Description

June 1 1926.

L. F. MEUNIER SWITCH MECHANISM Filed July 30, 1924 han@ Patented .lune li, lQZti.

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LEON F. MEUNIER, OF CLEVELAND, OHIO, ASSIGNOR T CHICAGO PNEUMATC TOOL COMPANY, OF NEW YORK, N. Y., A CORPORATN 0F NEW' JERSEY.

Yswirora MnoHANIsir.

Application filed July 30, 1924. Serial No. 729,050.

This invention relates to control apparatus for electrical motors and machinery. More particularly it concerns locking mechanism controlled by one control device for temporarily rendering a second control device inoperative.

One object of the invention is to provide simple, positively acting locking mechanism of the character described. is to adapt the ordinary snap switch to control the locking mechanism. Other objects will be apparent from the detailed description which follows.

While the invention is capable of general application, the particular form thereof herein used as an illustrative example is intended for use on electric coal drills having a man switch and a reversing switch, the locking mechanism being utilized to prevent careless and indifferent operators from re versing the drill while it is in operation.

ln the drawings:

Figjl is a plan view partly in section on the line 1-1 of Fig. 2;

Fig. 2 is a vertical sectional view on the line 2 2 of Fig. 1 with the greater part of the snap switch shown in elevation and the locking mechanism in operative position;

Fig. 3 is a view similar to Fig. 2 with the entire snap switch in elevation showing the locking mechanism in normal or inoperative position; and

Fig. 4c is a fragmentary perspective view diagrammatic in form showing the upper part of the snap switch and the associated elements of the locking mechanism, the cas ing being omitted. v

The embodimentl of the invention chosen for the purpose of illustration is contained in a casing adapted to be secured in a suitable inanner as by screw bolts a to the casing B of a coal drill, motor or other electrical device to be controlled. The casing, which may be in two or more parts and may include a junction box A, in which the end of the electric cable A2 is made fast, houses supcrposed switches, a main switch C of the ordinary snap type having an actuating button C and a reversing switch D having a control handle d projecting beyond the easing A and pivotcd at d therewithin for limited swinging movement.

The locking mechanism for restraining the control handle l of the reversing switch from movement when the main switch is Another object on comprises a rod or plunger 5 mounted for reciprocatory movement in bearings (3 and 7 within the casing A, a coil spring 8 encircling rod 5 and abutting against a washer 9 fixed thereto normally maintaining rod 5 out of the path of movement of control han dle Z or in inoperative position, as shown in Fig. 3. )tod 5 is moved to operative or locl ing position (shown in Fig. 2) when main switch C is on by a lever 1() pivoted on a pin l1 extending through guide bosses 12 within casing A. One end of lever 1() engages the upper end of rod D and the other end engages suitable actuating means on main switch C.

As previously stated, switch C is of.the ordinary snap switch type operated by a button c threaded on a rotatable shaft c, ,this shaft, during its rotation having two positions in which the switch is on and two in which it is oth a quarter turn of button c being sullicient to el'tect the change in the condition of the switch. On shaft c of the snap switch C is disposed the apparatus for actuating lever 10 and thereby the plunger 5 to lock reversing lever CZ against movement. rlhis apparatus preferably takes the form of a plate 13 of sheet metal or other suitable material having an opening loosely receiving shaft c and having two pairs of spaced opposed stops l-l arranged to closely engage opposite sides of the button c when the latter is screwed down uponv plate 13 wedging the latter against the shoulder c2 on shaft c. By this arrangement plate 13 rotates with button c and with shaft c. Plate V13 may be partly cut away as indi cated at 15 to malte visible to the operator the usual on and off indicia on the switch C. Upon plate 13 is secured by suitable mcans, such as screws 1G, a cam ring 17 carrying one or more lateral projections 18 to engage the short arm of lever 10. Each projection 18 has at one end an inclined cam surface 19 on which the short endfof the lever rides in an obvious manner. rFhis cam surface extends slightly above the normal height of projections 18 (Fig. 3) forming a stop shoulder 20 to prevent reverse rotation of the button c, which would unlock reverse control Z while the main switch was still oit in order to insure that the projections 18 register with the on positions of the main switch button c', the cam ring 17 Iis adjustable relative to plate 13 by the prollo 10. The combination with" a snap switch having a shouldered vrotatable shaft threaded above said shoulder, a control button .threaded on said shaft, 'an actuator plate loosely engaging said shaft and clamped a ainst. said shoulder by said button, ,said p ate having lugs engaging opposite sides of said button.

11. The combination with a snap switch having a .shouldered rotatable shaft threaded above said shoulder, a; control` button threaded on said shaft, a plate Vlooselir mounted on. said shaft'clamped between said button and said shoulder, means keying said plate to said button for movement therewith, and a cam projection adjustably secured to said plate.

12. The combination with a snap switch having a shouldered rotatable shaft threaded above said shoulder, a control button threaded on said shaft, a` plate loosely mounted on said shaft clamped between said button and said shoulder, means keyingy said plate to said button for movement therewith,

and a cam ring adjustably secured to.' said plate.

13. An actuator device for quickattachment to-a snap switch-comprising a support plate constructed andA arranged to be clamped on the shaft of the switch by the control button of the latter, said plate having projecting lugs arranged to engage said button to insure rotation of the plate with the latter, and a cam projection adjustably secured to said plate.

14. An actuator device for quick .attachment to a snap switch, comprising a support plate constructed and arranged to be clamped on the shaft of the switchA by the control button of the latter, said platehavingprojecting lugs arranged to engage said button to insure rotation of the plate with the latter, and a cam ring adjustably secured to said plate.

Signed by me at Cleveland, Ohio this th day of July 1924.

LEON MEUNIER.

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