US2507637A - Momentary contact impulse switch - Google Patents

Description

Patented May i6, 1950 UNITED STATES PATENT oFFicE Claims.

This invention relates to a momentary contact switch and more particularly to a contact operating element for a micro-switch or the like.

It is an object of this invention to provide a switch actuating device of the kind to be more particularly described hereinafter for momentarily closing a micro-switch or relay upon rotation of the actuating element in one direction and slipping past the switch upon rotation in the opposite direction.

Another object of this invention is to provide a momentary contact operating element for a micro-switch which will make or break the circuit upon upward travel of the actuating arm only and will return to its normal position without holding or operating the contacts of the switch upon return of the actuating arm to its normal position.

Still another object of this invention is to provide a momentary contact switch actuating device for momentarily actuating a relay or microswitch as used on counting devices on conveyors and production machinery, cutoff saws and knives on insulating board, plaster board, cardboard, and wood veneer forming machines.

With the above and other objects in view, my invention consists in the arrangement, combina tion and details of construction disclosed in the drawings and specification, and then more particularly pointed out in the appended claims.

' In the drawings:

Figure 1 is a transverse section, partly broken away, of a momentary contact switch constructed according to an embodiment of my invention.

Figure 2 is a longitudinal section taken on the line 2-2 of Figure 1.

Figure 3 is a fragmentary longitudinal section showing the switch actuating members in the switch closing position.

Figure 4 is a fragmentary detail section taken on the line 4--4 of Figure 1.

Figure 5 is a fragmentary detail section taken on the line 5--5 of Figure l.

Referring to the drawings the numeral II! designates generally a housing or casing within which the micro-switch and its operating mechanism are adapted to be housed. The housing Il! is formed with a front wall I I and a bottom wall I2 preferably formed integral therewith. The back and top of the housing Il) are closed by a rear wall I4 and a top wall I5, formed integral therewith, and formed of flat sheet material.

' A micro-switch I6 is supported within the housing Ill and secured to the front wall II. The switch I6 may be of any conventional type of micro-switch or relay having a casing Il and a contact actuating arm or button i8 extending from one wall of the casing. A bolt or screw I9 engages through one end of the switch casing I'I and engages the front wall II of the housing ID ior rockably securing the switch I6 within the housing. A second bolt, as 20, engages through the other end of the housing Il and engages in an arcuate slot 2| formed in the front wall of the housing I0. A nut 22 is threadably engaged on the outer end of the bolt 2t for securing the micro-switch I6 in a selected pivoted position about the fastening pin I9, within the housing lli.

An eccentric member 24 is rookably mounted within the housing I0 for engagement with the arm or button I8 of the micro-switch. The ece centric member 2li is formed of a substantially cylindrical upper body portion 25 rockably mounted on a pin 25 which extends through the front wall II of the housing It. The eccentric member 24 is spaced inwardly from the inner surface of the front wall I I by a spacer or Washer 2l. The bolt 26 is fixed relative to the wall II while the eccentric member 2t is rockably mounted on the inner end oi the pin. The pin 26 extends through the center of the body 25 eccentric to the axis thereof so that the periphery of the body 25 will engage the button I8 in certain pivoted positions, and will be free from the button in other positions. An arm 23 is formed integral with the body 25 and extends downwardly therefrom substantially at a tangent to the peripnery of the body. In other words, the arm 28 is disposed in a vertical plane laterally ofset from the vertical plane through the aXis of the bolt 2B and offset from the axis of the body 25. A blade or plate 2Q is secured to one side of the arm 28 substantially in alignment with the Vertical plane through the axis of the body 25. The plate 29 is formed with a vertically extending slot 3o therein. A screw, as 3l, engages through the slot 39 and threadably engages in the arm 29 for adjustably supporting the plate 29 thereon. The lower end of the plate 29 extends downwardly below the lower end lof the arm 2B, for the purposes to be described hereinafter.

A coiled spring 32 engages about the pin 25 adjacent the body 25, and one end of the spring ls secured on the pin by the engagement of one end of the spring through an opening 3s in the end of the pin. The other end of the spring 32 is xed on the arm 28, opposite from the blade 29 by a screw 35 or other suitable fastening devices. The spring 32 is tensioned for moving the eccentric member 24 in a counter-clockwise direc- 3 tion as viewed in Figure 2, so that the surface of the eccentric member will normally be biased out of engagement with the button I8.

A pin or stop member 36 is xed on the front wall II of the housing I8 and extends inwardly of the casing. The stop member 35 is adapted to abut the arm 28 of the eccentric member 24 for limiting the rocking movement of the eccentric member about the pin 28. While the arm 28 is in engagement with the limit pin 3S, the surface of the body 25 is out of engagement with the button I8 so that the button I8 is in its extreme ex, tended position from the micro-switch housing I'I:

A shaft 3l extends through the` front walllvl Iv below the micro-switch IE and below the eccen.- tric member 24. naled in a bearing 3S carriedybythe Vfront wall I I. The shaft 3l is adapted to be connected to or actuated by the operating means with whichv the micro-switch I6 is operatively associated. A

cylindricalinember Gti-.is xed to or. formedon the outerend :ci the shaft.3l.-.and is formed with a serrated frontface 3S.' rIhe. cylindrical member 38 isformedwith anoutwardly opening recess 40 therein within which a bolt ilisadapted to be threadablyengaged. Acorrelatedcylindrical memberl 32,A associated with the Acylindrical member 33 iscarried'bythe bolt 4iso that the serratedface 44;-, of :the cylindrical member 42 will be in frictionalgengagoment withV theserrated .face 39 of the cylindrical member 33, The boltI,I extends ythrough the cylindrical member l2f and into Ytlierecess 40 4.f or seuringthet cylin-` drical members38 and 42together. A shaft, as, is engaged through an arm-4E, flxedvto or formed integral with Ithe A,cylindrical member il?, and secured therein by `a set screwl;

Aylind1ca1-cam suonfzrtilfleV body 48 is .Cerried by the shaft 4,within the housing IEE. The shatsupporting memberZ 48.-is formed with a cylindrical body engageable about thel shaft 31 and havinga p airv of ,upwardly extending, transversely. spaced apart` arms.v 49, formed `integral therewith. The cam supporting. body. 48 and armslllare disposed invrverticalalignment with the eccentric member 24. within the. housing I0. A cam 58 is VpivotallyA mounted between the. arms 49 von the cam supportingmember VA'Igby atransverse pivot. pin i between'the .arms. A stopV member-or limit pin 52 xed betweenV the` arms 49 at the 'lower end thereof., below the-piyotpin 5I. The cam Etis rockable about the pivot Ypin 5I andk engageable with the limit pin 52, so that the cam is freelypivotal about the.pin5I in oney direction. A.V flat springl 5-engagesabout/theA lower surface ofthe cam supportingvmember 48. where it is xed at oneend. by a screw.55. or,Y other suitable Vfastening means. Thespring 5I!` continues about the periphery oi the lower body portion of the cam supporting member 43.101' engaging the lower endof the ycam iibelow the pivot pin 5I, for urging. the'lowerend or .the.cam

into enga-gement with'the limitfpinZ. While the cam member 58 is vpi-votally mounted on the.

pivot pin El, itis -constantly urged into engagement with the limitpin 52A bythe free endof the spring 54, soY thatthecam. Slis normally disposed radially relative tothe axis of theshaft 3l', on which it is supported.v

In the use and operation of themomentary contact switch device, describedabove, the micro;

switch Orrelay- IE-.is `operativelyconnected withthe electrical means .with which -it is associated, by a wire or. suitable leads 55.. Themicro-switch,

A shaft 31 is rotatably jourmally closed type, which is particularly adapted to be actuated out of its normal position only momentarily for the proper operation of the devices with which it is operatively connected. For momentarily actuating the relay or micro-switch I6, the shaft 31 will be rotated, either manually or in association with the means which are to be controlled by the micro-switch I6. Rotation of the shaft 37 in a clockwise direction, as viewed in Figure 2, will eiect therotation of the cam 50 about the axis of the shaft 3'.' to engage the upwardly extending lip 5'! of the cam 5G with the downwardly extending portion of the plate 29, carried-l by theeccentric member 24. The engagement of the lip 57 with the downwardly extending plate will press the eccentric member 24 into engagement with its associated stop pin 36, and as the cam 5d is spring pressed against rotation in a counter-clockwise direction, the lower end of the cam 5G will be moved in a counter-,clockwise direction-,against the tension of the spring-54, so that the cam 58 will be pivoted to pass freely under the eccentric member 24.

In `the counter-clockwise rotation of the shaft 3l', thelip E? of the lcam will engage the plate 29of the eccentric member 24, and as thecam ilislimited against rotation in a clockwise di-v rection by its stop pin `52, the eccentric member 24.*will be rocked about its :pivot pin 28 so .that the surface of the body 25, rempteiromthe center, will engage the button 8 4ofthe microswitch l-- The movement of the pin-or `button linwardly of the microewitch housing I'I will eect the actuation of the micro-switchfromits normally.v set position only momentarily until the cam 53 has moved downwardly to the left, as viewed in Figure 2 out of engagement with the plate 29, of the eccentric memberfZffI;4 The llimit of engagement of the cam 5D with theeccentric member Zbl-is noted in Figure-3 .of-the drawing, where the lip 5l has reached a point in .its rota-` tion onthe lshaft 3! where-.it is moving outof engagement with therlower, end ofl theplate 29. As-the cam 59 moves torthetlet, infFigure 3, the spring 32 willepress-the eccentricI member 2 4 back to` its normal position,l inengagement withv the stop pinr'. At thisrtime the button or-y switch actuating member I8-, will bespringpressed toV its normal position, either opentor closed'.`

I do not mean to conne myselfftotherexact details of construction herein disclosed, but claim allavariations falling, withinthepurviewof the appended claims.

I .claim:

l. A momentary contact actuatingdevice for a. micro -switch having aA contact aotuatingwarm comprising an eccentric. pivctedy member engageable with said contact actuating. armquponl rotation in` one directionv for actuating said switch, a plate on said memberA extending radially; therefrom, resilient means urgingsaid rnemberoutof engagement with said .arm-,7, av rotatable switch actuating shaft, a cam `body.iixedon said shaft and extending radiallytherefrom; acam rockable onsaid cam bodyengageableswith. said platefor rocking said eccentricl membeinupon rotation of. saidshaft inone direction.

2. A momentary Contact actuatingdevice for a micro-switch vhaving av contact actuating button Y n said member out` or" engagement .with saidv button; IiiA may be. of. the normally open-, v or. the.A noru ,lcsiliont meanspressing said member into..en.-,

gagement with said stop pin, a rotatable switch actuating shaft, a c-am body fixed on said shaft extending radially therefrom, a cam rockable on said cam body and engageable with said eccentric member upon rotation of said shaft, a stop member on said cam body engageable with said cam for holding said cam against rocking in one direction for rocking said eccentric member into engagement with said contact actuating button upon rotation of said shaft in one direction, said cam being rockable out of engagement with said stop member upon rotation of said shaft in the other direction and engagement of said cam with said eccentric member for rocking said eccentric member against said stop pin.

3. A momentary switch actuating device for a switch having a contact actuating member comprising a pivoted eccentric member engageable with said contact actuating member, and biased out of engagement therewith, a rotatable shaft, a cam member on said shaft radially thereof mounted for swinging movement in one direction engageable with said eccentric member upon rotation of said shaft in one direction for rocking said eccentric member into engagement with said contact actuating member and rockable in the other direction upon engagement with said eccentric member upon reverse rotation of said shaft.

4. A switch actuating device for a micro-switch having a contact actuating member comprising an eccentric member rockable into engagement with said contact actuating member and biased out of engagement therewith, an arm on said eccentric member extending from the periphery thereof, a rotatable shaft, a c-am supporting member xed on said shaft, a cam on said cam supporting member mounted for swinging in one direction, biased for normal radial disposition relative to said shaft and engageable with said arm for rocking said eccentric member to engagement with said contact actuating member upon rotation of said shaft in one direction and for rocking said cam out of engagement with said arm upon reverse rotation of said shaft.

5. A switch actuating device for a micro-switch having a contact actuating member comprising an eccentric member rockable into engagement with said contact actuating member and biased out of engagement therewith, a rotatable shaft, a cam supporting member fixed on said shaft, a cam on said cam supporting member mounted for swinging in one direction and biased for normal radial disposition relative to said shaft and engageable with said eccentric member for rocking said eccentric member to engagement with said contact actuating member upon rotation of said shaft in one direction and for rocking said cam out of engagement with said eccentric member upon reverse rotation of said shaft.

FRANK G. KRIZE, JR.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 389,122 Turner Sept. 4, 1888 974,480 Foster Nov. 1, 1910 2,093,085 Ludwig Sept. 14, 1937 2,297,180 Walsh Sept. 29, 1942

Images