US2333888A - Control device - Google Patents

Description

Nov. 9, 1943. c. F. RoBBlNs ETAL 2,333,888

CONTROL DEVICE Filed Ju1y`24. 1941 s sheets-sheet 1 Nov. 9, 1943. c. F. RoBBlNs ETAL 2,333,888

CONTROL DEVICE Filed July 24, 1941 5 Sheets-Sheet 2 NOV. 9, 1943. C, F, ROBBlNS ETAL' 2,333,888

CONTROL DEVICE Filed July 24, 1941 3 Sheets-Sheet 3 Patented Nov. 9, 1943 CoNraoL DEVICE` Clyde F. Robbins, Milwaiikee, and Edwin W; Seeger, Wauwatosa, Wis.,assignors'to Cutler- Hammer, Inc., Milwa of Delaware kee, Wis., a `corporation Application July 24, 1941, Serial No. 403,886

` s claims. wml-.142)

This invention relates to control devices, and is particularly applicable to electromagnetic control devices for effecting a given control Aoperation in response to-a predetermined number of current impulses.

The invention has among its objects'to provide an improved electromagnetically operated ratcheting mechanism for use in control devices of the aforesaid character which is compact and rugged in construction and exceedingly positive and reliable in operation.

Another object is to provide a ratcheting mechanism of the aforesaid character having readily adjustable means associated therewith forselecting and indicating the number of current impulses required to effect a given control operation.

Another object is to provide a ratcheting mechanism of the aforesaid character having improved resetting means associatedtherewith.

Various other objects and advantages of the invention will hereinafter appear.

The accompanying drawings illustrate an embodiment of the invention which will now be described, it being understood that various modifications may be made in the embodiment illustrated without departing from the spirit and scope of the appended claims.

In the drawings, f

Figure 1 is a rear elevational view of a control device embodying the invention with portions of the device broken away and shown in section.;

Fig. 2 is a sectional view taken substantially on line 2--2 of Fig. 1;

Fig. 3 is a fragmentary elevational view similar to that shown in Fig. 1 illustrating the resetting mechanism of the 'device in tripped position;

Fig. 4 is a side elevational view of the device shown in Fig. 1 with portions thereof broken away and shown in section;

Fig; 5 is a fragmentary sectional viewtaken substantially on line 5-5 of Fig. 2; and

Fig. 6 is a fragmentary front elevational view of the device shown in Fig.1.

Referring to Fig. l, the same illustrates an electromagnetically operated ratcheting mechanism l including a ratchet wheel 2 which is rotatable in a clockwise direction into a given angular position to operate a switch 3 shown in Fig. 5. Ratchet Whee1`2 has a` plurality of equally spaced teeth 4 formed on the periphery thereof which are shaped to provide radial faces llato be engaged by an operating pawl 5 and a holding pawl 6, andsaid ratchet wheel is biased to move in a `counterclockwise directionby a spring `l (Figure v2) into a predetermined home position which is determined by the setting of an adjust- .able stop mechanism 8 shown in Figs. v'2, 4 and 6. Pawl 511s operable'bya motor magnet 9 'to effect step by `step movement of ratchet wheel 2 in a clockwise direction, and-upon displacement of said ratchet wheel out of its -home'position pawl 6 acts to prevent return movement thereof under the action of `spring Yl. Pawls 5 and 6 are both releasable fromvratchet wheel 2 either` by trip magnet l0 or bya manual reset lever H to permit resetting of said ratchet wheel in its home position under the action of spring l.

More specifically,l the ratcheting mechanism I and switch 3 are mounted upon the rear face of -a front insulating panelv I2.- lAs shown in Fig'. 2, ratchet wheel 2l -is fixed tol a shaftA i3 which is rotatably supported within a bearing member Ill mounted within lan opening in panel l2. The motor magnet 9 and tripping magnet I0 are arranged above thevratchetl wheel 2 and each' of said magnets is provided with a horizontally disposed U-shaped core-member, l5 having an operating windingv |16 mounted-upon the upper leg thereof. Also each of said magnets is provided with a vertically disposed armature member il having a tail piece I8 on the lower end thereof which is pivotally mounted -upon a pin "i9 carried by the lower leg of its associatedfcore member l5. The core members l5 of magnets 9 and I0 are arrangedin opposed relation and are fixed to opposite sides .ofabracket 20 which is secured `to the rear face of insulating panel 5|2.

' As shown in Fig. 1, the pawls 5 and 6- are larranged to the left of ratchet Wheel 2 and las shown in Fig. 4, pawl 5 is iixed to the vbight portion of an inverted U-shaped lever 2|, while' pawl 6 is arranged above pawl 5 and is xed to the bight portion of a U-shaped lever 22.' The tail piece I8 associated with armature Il of inotor magnet 9 has an inclined downwardly extending arm 23 fixed thereto and the. open end of lever 2l is pivotally' connected to the. lower end of said arm by a pin 24. Y The `open end of lever 22 is pivotally mounted upon the pivot pin I9 associated with trip magnetl I. A pair of springs 25-25 are located on opposite sides of leversf2l and 22 and the upper ends of said springs are connected to aA pin 26 carried by lever 22, while the lower ends thereof are connected to a pin 2l carried by lever 2l. l The springs 25 act to bias levers 2| and 22toward the right to hold their associated pawls '5 and 6 in engagement with theperiphery of ratchet Awheel 2. Said spr-ingsalso act-to normally holdtheloWer spring end of arm 23 in engagement with a screw stop 28 which is adjustably mounted upona bracket t 29 fixed to the rear face of panel I2.

Upon energization of the motor magnet 9 the amature I1 associated therewith islmoved into attracted position and arm 23 and lever 2| are moved from the full line position to the dotted line position.: illustrated in Figqfl against-y the action of springs/25 to effect downward movement of pawl over the ratchet tooth 4 located immediately below said pawl. During downwardmovement of pawl 5 into its dotted line position,

ratchet wheel 2 is held against counterclockwise rotation by engagement of. pawl hwith .the radial f face of the ratchet tooth-fl lloeatedfabovesaid I pawl. Upon deenergizatiox'rotmotor magnet its associated armature I1 is released and arm 23 and lever 2| are returned to thefull line positionv illustrated in Fig. 1 under the action of springs 25. During return of lever 2| to its full line position pawl-5 engages theratchet toothdlocated thereabove to '.eiect advancefof -ratchetwheel-Z -in .a clockwise adirection. As- .is gapparent, adjustment of screw stop.2 8:varies they degree of deenergisationof motorfrnagi1e t9 .and-said stop is so :adjusted that `the ratchet wheel 2 is `advanced one tooth in a clockwise directionduring return .of pawl 5 to its full v-lineposition :Itis thus 'tap- ,parent that energizationfof motor magnet r9 by successive current impulses effects toothrbyftooth advance .of ratchet|wheel-2 in a'clockwise `direction against theaction ci` spring 1. M1

As hereinbefore `stated, ratchet wheel :2 is

biased nby spring 1 -toyrneve toward apredeter- Y mined home Aposition. whichfis y determined fby the setting of an adjustable stcprmechanismgfand Aupon displacement of said .ratchet -wheelf out `:of homel position the: same isresettable in 'suchposition` by the trip magnet.V ior by the manualireset.,

lever` II. vAs shown in. Fig. 1, they tail; piece -I8 associated with the Aarmature, of ktrip-magnet I0 has a downwardly -extendingplate30fiixed thereto which is locatedto'the rightzof the bight portions of levers 2| `and 22 and isnormally held out of engagement therewith. Upon movement of amature I1 off trinimagnet I0 into fits attracted position plate- 8|! engages `the Lbight- `por .tions of levers.2 Ira-nd 22 to move said levers irom the position l shown in lis., l .inici-.the DDSitiOn shown in Eig. :3 to -merebyfjefiect.disengagement of paw1s-5 and- 6iromtheteethlof .ratchet wheel 2. Thus upon energization of .t r.ip-.magnet fl 4ratchet Awheel. 2 is released .to-permit :resetting positionunder theaction of thereof in home As shown .in Fig. 4, ,the manualreset :lever Il kis mounted within an externallyV threaded bushing 3| which is V`securedwithinga'n -openingin .intermediate -its endsupon: af horizontally disposed pivotpin 3l carried by :bushing 31| wand :the inner end of saidlever is,\located' immediately below the lowerend of .armature member 1 I1 of trip magnet I 0 while theirontendcf saidslever t l .is accessible Vformanual operation tromthe iront `of insulating-.panel I2. Leverd Lis normally held bylglavlty in the `position shown :in Fig. @lr-:andthe front end thereof fis movable downwardly to move armature I1 of; trip magnet III and 4its associated plate into the position shown in Fig. 3;ato ,permit resetting .of -ratChetwwheel 2 1in, homegposition .under the actionr of spring i1. Y, 1

Lever 2| has lai verticallydisposed cam .35 associated `therevvit-h'fwliich .prevents over- .shown inii'g.A ljcam member "recess31 fcfrmedon the'leithand side 'thereof for 2,333,888 f i Y n travel of ratchet wheel 2 due to inertia upon upward movement of pawl 5 into the full line position shown in Fig. 1. As shown in Fig. 1 said cam member is located to the left of lever 2| and the upper end thereof is pivotally connected to the tail piece I8 associated with the armature of trip magnet I0 b a pin 36. Also as lasartangular receiving a square stop member 38 which is adjustably mounted upon the rear face of panel I2 -and the right hand side of said cam member is shaped to provide acam surface having an ln- `fclined face 39 and avertically disposed iace 40. A-s'pring'll factsffto bias cam member 35 down- -wardlyand toward the stop member 38.

Cam member is normally held in the positionshown in'Fig. 1 against the action oi spring 4I byV engagement of stop member 38 within the recess 31'. The inclined face 39 on cam member 35 permits vmovement Lof lever 2| toward the-left YYwliexi-tlie same `is movedffdorgnwaldly to. move:

pawl 54 Yfrom .the fulmine pesitionto. l,the dotted line Aposition shown-rin. Y However. upon return of lever 2| and its associatedgpawl I5 to full line position show-n in- I the iene 40 fon` cam `.member 85 acts to llock said lleverand itsassociated pawl against movement -towardgthe left out.

of saidiull line positomto thereby prevent over- .travel fof. ratchetgwheelfZ. :lis`- shown in Fig. 3 upon energization of trip magnet VIlcam member Vlli is movedfu-pwardlyfand tkesurtace 40 thereof is then located above lever iito'permit release'of vpawl 5 fromratohet 2V by )l .The .switch mamma in` Pig. s lincludes pair i 4of stationary contacts-M land *Stand a cooperating bridging contact 46. Contacts 44 andlil-are .mounteduponfan base ,41l whichis-.se-

l.curedto the rear face of panel-|2 and bridging Contact isyieldinglygmoimtedfupon an operati ing tpn 48 which is slidablyfmpported ywithin an f opening in said-base.--;,Qperatns Mis-nor- Wmally -neld -infthe position shown by afspring 49 andy is movable' inwardly .against the action of said spring to-mdvefbridging vooatactg into en- .gagementgwith its associated staionargy conto/cts kM and'45. VBin4,3,isoperable byifvan insulating arm 50 which is secured vtovslyliftpl. by aseaew 5I and is also secured to therearace of ratchet ywheel 2f-byagscrewv2. i0 has mfad-jimtable screw' stop 5 3' mountodmon .the freefend thereof and upon stepubyfstep fadvanceaf ratchet wheel 2 intofa givenflimit againstfthe action of spring 1V said stop engages the operating; pin .48 to move bridging contantiv 46 into. f-enssment with Sta- Ationary contacts: `and I5.

.As-shown 'in Fig. 2, spring iisoffapiral form c and the puter.: endy thereof :is attached to a pin -54 (Fig. 5) .mountedyfimonftheswitch operating arm 50 while the inncrfmd thereof isheld within a ,slot .55 (Eig. 2) ,providedsnn Sthe vouter surface in :Figs 2. and'` 6 comprises-fa. leverilexed tog the front end Y of shaft L .I3 .xandanidustahle `circular dial l6 I havinga stop imeunted .upon the vfront Lace thereof tor engaging lever. in

-F.`\g.f2, diallais-:adjuatablyisimported upon the v front Vend of;.bearinj :Hand :as Ashown:` in Figa A and 6. panel i l2 `hamaca fscrewz umountedthereon which carries a thumb nut 64 for clamping said dial against the front face of said panel to hold the same in adjusted position. Panel I2 also has an indicating member 65 mounted thereon which is located to one side of dial 6I and is provided with a V-shaped notch 66 on the side adjacent said dial.

Ratchet wheel 2 is normally held in a predetermined home position by engagement of lever 60 with the stop 62 associated with dial 6I and as is apparent such home position is determined by the angular setting of said dial. Upon step by step operation of ratchet wheel 2 by the motor magnet 9 lever 60 is moved in a counterclockwise direction (Fig. 6) away from the stop 62 toward the indicating member 65. Indicating member 65 is so located that when lever 60 is moved into alignment with the V notch 66 the stop 53 on operating lever 50 engages the switch operating pin 48 to move bridging contact 46 into engagement with its cooperating stationary contacts 44 and 45. It is thus apparent that the angular setting of dial 6| determines the number of successive operations of motor magnet 9 which are required to move the ratchet wheel r2 from home position into the limit wherein switch 3 is operated. Dial 6l is provided with a zero marking corresponding to the position of lever 60 when the same is in engagement with stop 62. Said dial is also providedwith graduations which extend in a counterclockwise direction from said zero position, said graduations being spaced to correspond to the spacing of the teeth 4 on ratchet wheel 2. Thus the graduation on dial 6| which registers with the V notch 66 indicates the number of successive operations of motor magnet 9 which are required to move ratchet wheel 2 from home position into its switch closing position. Also the position of lever 60 on dial 6| indicates at all times the number of operations which have been counted. By loosening the thumb nut 64 and holding lever Il in position to disengage the pawls and 6-from ratchet wheel 2 the dial 6I and lever 60 may be readily adjusted to select the number of successive operations which are required to effect operation of switch 3.

As is apparent, the above described device is capable of being used in connection with machines of various types to count successive operations of the machine and to provide a given control effect upon counting of a selected number of operations. Also the trip magnet l0 may be controlled to effect automatic resetting of the device upon counting of a selected number of operations.

What we claim as new and Letters Patent is:

l. In a mechanism for effecting operation of a control device in response to a selected number of power impulses, in combination, a ratchet member movable in one direction into a given operating limit to eiect operation of the control device and biased to move in an opposite direction into a selected home position, means responsive to successive power impulses to effect step by step movement of said ratchet member away from its selected home position toward said given operating limit, said means including an actuating pawl biased toward a given normal position and movable out of and into such position under the action of a power impulse to advance said desire to secure by ratchet member toward said given operating limit, an element for locking saidactuating pawl upon return thereof to normal position to prevent overtravel of said ratchet member, a holding pawl engaging said ratchet member to retain the same against return movement upon advance thereof away from home position, `and a single trip element for releasing said locking element and for moving said actuating pawl and said holding pawl out of engagement with said ratchet mem-ber for resetting of said ratchet member in home position.

2. In a mechanism for effecting operation of a control device in response to a selected number of power impulses, in combination, a ratchet member movable in one direction into a given operating limit to effect operation of the control device and biased to move in an opposite direction into a selected home position, means responsive to successive power impulses to effect step by step advance of said ratchet member away from its selected home position toward said given operating limit, said means including an actuating pawl biased toward a given normal position and movable out of and into such position under the action of a power impulse to advance said ratchet member toward said given operating limit, an element for locking said actuating pawl upon return thereof to normal position to prevent overtravel of said ratchet member, a holding pawl engaging said ratchet member to retain the same against return movement upon advance thereof away from home position, a trip mechanism for releasing said looking element and for moving said actuating pawl and said holding pawl out of engagement with said ratchet member for resetting of said ratchetmember in home position, and means associated with said trip mechanism for eiecting operation thereof either manually or electromagnetically.

3. In a mechanism for eiecting operation of a control device in response toa selected number of power impulses, in combination, a rotatable ratchet wheel movable in one direction into a given operating limit to effect operation of the control device and lbiased to move in an opposite direction into a selected home position, a motor magnet, an actuating pawl associated with said ratchet wheel and operable by said motor magnet upon energization thereof by successive current impulses to effect step by step. advance of said ratchet wheel away from home position toward said operating limit, said actuating pawl being movable out of a given normal position upon energization of said motor magnet and being biased to return to normal position to effect advance of said ratchet wheel upon deenergization of said magnet, an element for locking said actuating pawl upon return thereof to normal position to prevent overtravel of said ratchet wheel, a holding pawl associated with said ratchet wheel to retain the same against return movement upon advance thereof away from home position, and a single trip magnet for releasing said locking element and for also releasingy said actuating pawl and said holding pawl from said ratchet wheel for resetting of said ratchet wheel in home position. f

CLYDE F. ROBBINS.

EDWIN W. SEEGER.

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