2,677,029 7 to 18, inclusive, is briefly as follows: Figs. 13 tO 18, inclusive, show parts in the normal position corresponding to the position of the parts shown in Figs. 3 to 8, inclusive, of the first embodiments The knock-off pin II 0 is shown in posit-Ion to provide the maximum tirne cycle, pointer I IO or indicator arm 112 being set at the last lefthand division on scale I IS (see Fig. 15). In this position, knock-off pin I IO has no influence on latch 101 so that the tooth 105 on the lotch remains in engagement with the tooth 100 on arm 68' as shown by full lines in IP@ig. 17. In this relationship, uponenergization of the solenoid, the armature thereof will move to the right and collar 40' will move pin 4 I' to the right so that the cam assembly ivill be rotated to move contact 55 out of engagement with contact 51 and into engagement with contact 56 as in the precedingenibodiment. At, the same time, due to the engagement of pin 4 I' against the opposed edge of the Pawl carrying arm 971, this arm will be moved to the right, referring to Fig. 16 and the ratchet pawls 96' will ratchet over the wheel 89'. Tipon de-energization of the solenoid, Vne spring 39' will move the collar 381 to the left, arging pit-l 411 on crank 68' clockwise and through engagement of tooth 100 on the latter with tooth 105 on latch 101 inducing similar rotatioii of pawl carrying arm 97' at a rate governed by the titner device through the engagement of pawls 96' with ratchet wheel 89' on the latter assembly. Since in the adjustment shown in Figs. 16 and 17, knock-off pin II 0 is so far to the left that it has no influence upon latch 101 before the clockwise rotation of arm 68' and associated cain assembly has rearhed the normal position allowing contact 55 to move back out of engagement -vvitn contact 56 and into engagement with contact F)7 again, tooth 105 on latch IO 1 will remain in en-, gagement with tooth 100 on arm 68' throughout the entire clockwise movement of the latter and thus with this adjustment the rate of clockwise movement of arm 66' and its associated cqm assembly will be governed by the tiw-er device throughout its complete operating arc. EJ.ef erring now to Fig. 19, the knock-off pin I IC is shown in a position corresponding to an intermediate adjustment of the pointer I IS on the sca,le I 1 5 so that the tiiiie cy-- Ie is less than maximum. in this figure, the arm 68' and the latch I 0 i are shown by dash lines in their normal positions. Furthe):, these parts are shown by full or solid lines in the positions which they have at the end of the timing cycle, that is, just as the tooth 105 on the latch is disengaged fi:om the tooth 100 on the arm 68' during the movement of the armat-cire under the influence of the spring 39', the solenoid having been de-ei-iergized. Star'Lling with the parts in their normal positions, upon energization of the solenoid, the arniature t'@iereof will move to the right causing the collar 40' to move the pin 4 I' to the right so that the cam assembly will be rotated to close the switch as in the preceding embodiment. As the pin 41, inoves to the right, the 63' is moved countercloclcwise, and during such rqovement, the cam su,,,face I IO on the back of the tooth I IC will en.g,,Lge the cam surface @20 on the back of the tooth 105 so that the latch 101 will be cammed out and then, when the teeth are in alignment, the tooth 105 on the latch will snap quickly and posit-ively -into engagement with the tooth 100 oi-i the arm 63'. Following this, the pin 41' will ir@imediately strike the opposed edge of pawl car8 the right and ratchet pawls 96' will ratchet over the wheel 89'. Still referring to Plig. 19, upon de-energizatioii of the solenoid, the spring 3 9' will move the crank ar-,-,,i 68' and the Pawl carrying arm 971 clockwise as a unit at a rate governed by the timer device in the manner previously described, but with the setting of the knock-off pin shown in Mg, 19, this pin is effective to disengage the latch fol 10 from the crank arm at an intermediate point in operating are of the latter, depending upon the selected time cycle, whereupon the spring 39' will drive the arra 68', together with its associated cam assernbly, with great rapidity through the 1,115 remainder of its operating are to effect the same switch action as previously described. It will be seen that, upon engagement of the arm I 08 of the latch with the knock-off pin, the latel'i is moved counterclockwise about its pivot 102 until the tooth of the latch is disengaged from the tooth 100 of the arm 681. During this time, some r-action is transmitted through the latch 1,4'1 to the pawl carrying arm 97, (which is free 25 to w-ove -,ounLerclockwise as the pawls 961 ma@@, ratchet over the ratchet Wheel 891) with the result that ti-ie arr-q 97, will move counterclockwise from the dash line position to the dash and dob line positioia showii in Fig. 19, and the latch 101 will assume th- nornial position shown in broken lin@-s. in tois position, the latch 101 is urged os far as the lajock-off pin will allow, clockwise 'U-Owai,ds Lhe s'@op IDi by the spring 111. It is O,)vious that th-, time cycle may be varied by ad@S 5 Justil"g the iiid-icator arm II 2 and the knock-off pin I I 8 carried thereby. As m,,iny char).ges could be made in the above construction and many apparently Nvidely diffeient erdbodiments of this invention could be @10 made without departii-ig from the scope thereof, it is iiitended that all matter contained in the above description or shown in the accompanyiiig drawin@s shall be interpreted as illustrative and I'lot in a ii-miting sense. 15 It is also to be understood that the language USed iD- I'@he following claims is intended to cover all of the geiieric and specific features of the invent-;'Gr@ herein described and all statements of the scope of the -invention which, as a matter of lio laiip@uage, might be said to fall therebetween. I claini as my invention: 1. ir. a time delay relay, electromagnetic means havi.,Lig in ari-patui:e provided with a shoulder, a sli-dable collar oii said armature, a spring about r,5 said Lrilla-L-,Ure ai)d b-,aring against said slidable collar aiid ,irranged to be compressed upon ener.@i-zation of the electromagnetic means and to move the arma;ture outwardly upon de-energization of the electromagnetic means, a switch, t oo cam controlliiig said switch, an escapement clock mechanisrii for controlling the speed of rotation of said. capi in one direction, and a pin engaging bet-Teen said collar and shoulder and operatively connected to said cain and said clock mechanisti-i. 65 2. '@n a "iriie de.,ay relay, electron-iagnetic means having a coil prov4@ded with a tubular core and an armature slida'oly L-itting in the core and having a stein exteiidin.@ therebeyond, said arm'ature having a polished plated surface, a collar aboul' 70 said ste.-,ii and abutting the end of said core, a shoulder on said armature adjacent the free end of said stem, a slidable collar on said stem between said first raentioned collar and shoulder, a spri.ng about said armature between said colrying arm 97', whereupon this arm will move to 75 lars and arranged to be compressed upon ener-

9 gization of the electromagnetic means to move the armature outwardly upon deenergization of the electromagnetic means, a switch, a cam controlling said switch and rotatable in opposite directions, ar- escapement clock mechanism for controlling tha speed of rotation of said cam in one diree,tion, and ,i pin engaging between said second menti-oned collar -.tnd shoulder and operatively connected to said cam and said clock roechanism. 3. In a time delay relay, electromagnei@ic means having a slidable armature provided with a shoulder, a slidable collar on the armature, a spring about the armature and bearing against said slidable collar and arranged to be compressed upon energization of said electromagnetic rneans and to move said armature outwardly upon deenergization of the electromagnetic means, a svjitch, a cam controlling said switch and rot%table in opposite directions, an escapement clock mechanism for cotitrolling the speed of rotation of the cam in one direction, a pin engaging betnveen said shoulder and slidable collar and connected to said cam, an arm connected to said pin, and a pawl and ratchet connection between said arm and said escapement clock mechanism. 4. In a time delay relay, electromagnetic nieans having an armature provided with a shoulder, a slidable collar on said armature, a spring about said arrqature and bearing against said slidable collar and arranged to becompressed on inward movement of the armature upon energization of the e lectromap,,netic means to move the armature olitwardly upon deenergization of the electromagnetic means, a switch, a cam controlling said switch, an escapement clock mechanisr-yi for controlling the speed of rotation of said cam in one direction, a pin e-@igaging between said collar and slioulder and operatively connected to said cam and said clock mechanism, and means for positively limiting the extent of movement of said slidable collar upon inward movement of the armature whereby to prevent overthrow of the cam ap-d clock mechanism. 5. In a time delay relay, electromagnetic means having a coil provided with a tubular core and ,an arm, iture slidably -fitting in the -core and having a stem extending therebeyond, said armature having -a polished surface, a collar about said stem and abutting the end of said core, a shoulder on said armature adjacent the free end of said stem, a slidable collar on said stem between said first mentioned collar and shoulder, a stop col.lar on said stem between said first and second colla.-s aiid arranged to limit the extent of movement of the second mentioned collar v;hen the armature is moved innvardly, a spring P-bout s,,iid ariiiature between said first and second mentioned collars and arranged to be compressed upon energization of the electromagnetic means to move the armature outwardly upon deenergization of the electromagnetic means, a switch, a cair- controlling said snvitch and rotata@j)le ui opposite directions, an escapement clock mechanism for controlling the speed of ro'bation of said cam in one direction, and a pi-n ei,igaging between said second mentioned collar at-id shoulder and oderatively connected to said can,i alid said clockmechanism. 6. In 9, tirne delay relay, electromagnetic means liaving aii arraature, a switch, a cam controlli,n.g said switch, an arm carried by said cam ineans, on escapement clock mechanism, ratchet raeans ope.,ati-Vely associated with said escape.niei,it mech,,inism, an arm carried by said ratchet 216773029 10 means, said arms being relat-ively movable with respect to each other, means actuated by said armature for moving said arms in one direction upon ener,@ization of the electromagnetic means, latch means carried by one arm and interengaging the other arm to eff ect movement of said arms in unison in a direction opposite to said one direction upon de-energization of said electromagnetic means and under control of said es10 capement mechanism, and means for tri-Dping said latch rpeans at a selected point in their said opposite direction movement to disengage said arms so that contiiiued movement of said cam arm by the armature can ensue free from con15 trol of said escapeinent mechanism. 7. In a time delay relay, electromagnetic means having an armature movable between two positions, a sv7itch having a member movable between two positions, a cam for controlling said switch 20 member, an operative connection between said armature and cam through which the latter is rotated in one direction when said armature is moved into one position, an escapement clock Y.Yiechonism forcontrolling the speed of rotation 25 of said cam in the opposite direction during movement of said ormature to its other position, spring means for driving said clock mechanism and arranged to be placed under compression by soid armature when said electromagnetic means 30 is energized, a disengageable latch connection between said clock mechanism and cam, and adiustable trip means for said latch connection. 8. In a time delay relay, electromagnetic means having an armature movable between two nosi-- 35 tions, a switch, a cam for controlling said switch, an operative connection between said armature and com and through which the latter is rotated in opposite directions udon energization and deenergization of said electrornagnetic means, an 40 escapement clock mechanism for controlling the sdeed of rotation of sai-d cam in one direction, a pivoted arm operatively associated with said armature and movable in opposite directions upon energization and deenergization of the 45 electromagnetic rneans, a ratchet associated with said clock mechanism, a pawl carried by said arm and cooperating with so.,id ratchet, a latch pivoted to said arm and engageable with said operative connection upon movement of the armar)( ture in one direction, and adjustable means for tripping said latch. 9. In a time delay relay, electromagnetic means b,aving an armature provided with a shoulder, a slidable collar on said armature, a switch, a cam 55 controlling said switch and having a crank arm connected thereto, a tooth on said arm, a pin carried by said arm and engaging between said collar and shoulder, an escapement clock mecharism for controlling the speed of rotation of said 6o cari in one direction, a pivoted arm, a ratchet associated with said clock mechanism, a ratchet pa,,vl carried by said pivoted arm and cooperating with said ratchet, said pin being arranged to engage said pivoted arm to move the same in 6,5 a direction in which the pawl will ratchet over said ratchet, a pivoted latch carried by said pivoted arm and arranged to engage said tooth, an adjustable pin for disengaging said latch from said tooth, and sprin@ means for moving said 70 collar outwardly and said pivoted arm upon outward movement of said armature. 10. In a time delay relay, electromagnetic means having on armature movable between two positions, a switch having a member movable 75 between two positions, a rotatable shaft, a cam

on said shaft for controlling said switch meinber, a crank arm secuxed to said shaft, a pin carried by said cranlc arm and operatively connected to said armature and through which said shaft and cam are rotated in one direction when said armature is moved into one position, an escapement clock mechanism for controlling the speed of rotatioll of said cam in the other direction, a pivoted arm operatively connected to said pin and through which said crank arm is moved, a ratchet associated with said clock mechanism, a pawl carried by said pivoted arm and arranged to ratchet over said ratchet when said armature is moved into the first mentioned position and 2,677,029 12 adapted to positively engage the ratchet vihen the armature is moved to its other position, and spring means for driving said clock mechanism and arranged to be placed under compression by said armature when said electromagnetic means is energized. References Cited in the file of this patent UNITED STATES PATENTS 10 Number Name Date 2,064,656 Goff -------------- Dec. 15, 1936 2,235,273 Wheelock et al ------ Mar. 18, 1941 2,392,183 Phillimore --------- Jan. 1, 1946

Patented Apr. 27, 1954 29677tO29 UNITED STATES PATENT OFFICE 2,677,029 TIME DELAY RELAY Merritt Van Valkenburgh, Upper Nyack, N. Y., assignor to M. H. Rhodes Incorporated, Hartford, @Conn., a corporation of Delaware Application March 5, 1952, Serial No. 274,910 10 Claims. (Cl. 200-97) 2 This invention relates to a relay having switch means, electromagnetic means associated wit,h the switch means, aiid a tiraer device for delaying the operation of the switch means. 'rhe aim of tlie invention is to provide a relay 5 of this cha-racter having various features of novelty and advantage and which is particularly characterized by its adaptability to a wide variety of uses; by it flexibility in use in that it is capa@ble of operation on direct or alternating currents at 10 various voltages to control circuits of various sorts f<)r various tiw-e cycles; by its dependability and accuracy in operation under widely varying condi'Gions and influences to which it may be subjected such as extreme temperature changes, vi- 15 bration, shock, etc.; by its ability to stand up under hard service; by its compactness, and by its simplicity in comtruction and arrangement and its economy in manufacture. Other objects will be in part obvious and in 20 part pointed out more in detail hereinafter. The inliention accordingly consists in the features of construction, combination of elements ,lnd arrangement of parts which will be exemplifl,-d iii the construction hereinafter set forth and 25 the scope of the application of whicb will be indicated in the appended claims. In the accompanying drawings, wherein 1 have shown two eni@bodiments which the present invention may take: 80 Figure 1 is an elevational view looking towards one side of a relay constructed in accordance @x7ith one embodiment of the invention, the cover of the- casing being in longitudinal section; Fig. 2 is a view looking at the right hand end 35 of the relay as seen in Fig. 1, the end of the cover of the casing being broken away; Fig. 3 is a vi-ew similar to Fig. 1 but looking at the other side of the relay; T,'dg. 4 is a view similar to Fig. 2 but looking at 40 the otber end of the relay; Figs. 5, 6, and 7 are horizontal sectional views taken through the relay, these views being Tespective-ly taken on substantially lines,a-a, b-b, and C-C of l@lig. 1; 45 Fig. 8 is also a horizontal sectional view through the relay, this view being taken substantially on line d-d of Fig. 4; Fig. 9 is a partial vertical sectional view, the same being taken on line e-c of Flg. 4; 50 Pig. 10 is a detail view of the switch arm and the cam assembly for controlling the same as viewed from below; Fig. 11 is a detail view of the ratchet mechanism associated with the time device and as viewed from below; l,,ig. 12 is a detail view showing the stem of the armature of the solenoid and parts associated therewith; F-ig. 13 is a view similar to Fig. 1 but showing another em-bodiment of the invention, the casing anO certain other parts being omitted; Fig. 14 is a lefthand end view of the structure sliown in Mg. 13; Fig. 15 is a top plan view thereof; Fig. 16 is a horizontal sectional view taken substantially on line 16-1 of Fig. 14; Fig. 17 is a horizontal sectional vl-'ew taken substantially on line 17-17 of Fig. 13, the knockoff pin I I 0 being shown in position to provide la maximum time cycle; Fig. 18 is a detail view of the ratchet mechanism shown in Fig. 16 but as viewed from below; and Fig. 19 is a view similar to Fig. 17 but showing the pin I IO adjusted to a position where a shorter time cycle is obtained. As will be seen from the a@-companying drawings, my iriproved relay comprises,generally one or more solenoids or magnets, a single solenoid A being shown in the preselit instance, and switch means B controlled by a cam assembly C which is controlled by the s@olenoid and a tiiner device D in such manner that there is a time delay between the in,.quencing of the solenoid and the opening or clos.-Ln. of the switch means. In the embodiinent shown in Figs. I to 12, the cam assembly C is turned in one direction on the impulse stroke of the armature to open the switch and is turned in the opposite direction by a spring associated with the arm-ature for moving the latter on its return stroke when tl.,ie solenoid is deenergized. This arrangement, however, is shown by way of exemplification, it being tinderstood that the switch may be closed on the impulse stroke of the armature and opened on its re,'Lirn stroke thereof and that the timer device moybe effective for delaying operation of the switch following the impulse stroke of the armature. Referring to the embodiment shown in Figs. I

to 12, the instrumentalities A, B, C and D raay be enclosed in a housing or casing E -ahich, in the present instance, includes a base iS and a boxlike cover 16. 'Che base and cover may be made of suitable insulating material, such as plastic. The various specified mechanisms or devices are carried by a suite,.ble chassi-s securcd to the base 15. While this chassis may take aiiy suitable form, it is here showii as co@-nprising a reclvangular frame 17 within which the coil 30 of the solenoid is mounted, a bracket IS secured to oiie e-,id of the frame 17 and forming, in part, a support for the cam assembly C ,ind the timer device D; and a bracket 19 secured to the top of the frame 17 and to which the boxlike cover I 6 i.s secured as by means of a screw 20. The inargi-n of the base 15 is rabbeted as at 21 so as to closely receive the lower edge of the cover and thus form a substantially dustproof joint. Arising from one longitudinal edge of the base 15 is an ui)staiiding flan.-e or wall 22 to which is secured the various electrical terminals associated with the solenoid and the switch means. One side wall of the cover 16 has an openinl,- for accommodating this flange 2 2 and. the abutting edges of the open.. ing and flange are complementarily rabbeted as at 2 3. Referring now more spe,-ifically 'Llo the solenoi-d, the same is here shown as comprisiii.- a coil 30 having a tubular core 31 secured in and extei-iding beyond the forward end wall 32 of the frali'le 17. Fitting in the other end of the core is -a plup; 33 which is secured to the other end wall Sel o-il the frame 17. 'fhe frame 17 is secured to the base 15 by bolts 35. The solenoid h.as an, armq,ture 36 slidably fitting in the core 31, and th-is armature has a stem 36' e@,tending beyond the open end of the core. About this sten-i and adapted to abut against the open erd of -zhe core is a collar 37. About the ste-,ii 33' and interposed between the collor 37 and a second collar 38 is a coiled spring 39 for returning the e@rmature to the normal position shown -in the drawings upon de-enerffization of the solenoid. The collar 38 is slidably mounted on the stem 36'. A pin 41 is associated with the ratchet meelignism of 'Lhe timer device D .,,nd the cam assembly C, as hereinafter explained more in detail. The lower end of this pin engages between the collars 38 and 40. The collqr 40 forms an abuttiicig shoulder for the pin ond abuts against a nut 42 adjustably screwed onto the free threaded end of the stem 36'. The body portion of the arrrature and the stem 36' thereof may be chromiu-Lil Dlated and polished so that the armature may slide within the core and. the collars may relatively slide with respect to the stem without sticking or undue friction in the ,ibsence of alubricant. By arranging the collars 38 and 4,,l on the stem 361 wi'.th the pin 41 en.-a.-inp.,- therebetween, the necess-i@uy of provi-ding a guiding support for the free end of the stem is eliminated, the armature may tui-n about its axis without affectin.- the operation of the appar,,,tus, and lubrication is e'Aminated, all of ivhich provides a very simple, effective structure permitting the relay to function over wide temperature variations. It has been found that the mechanism will operate with substantially lik,- 9,n-c-Liracy between temperatures ranging from minus 76' to plus 185, F., and this ,vould not be possible if thecontactin- sliding surfaces were lubricated as the consistency of the lubricant would change depending upon the temperature to which it would be subjected. There may also be 2,677,OP,9 4 slidably mounted on the stem of the armature a stop sleeve or collar 44, the purpose of @vhich will be later described. The ends of the coil 30 are connected to terminals 43 carried by the fiaiige 22. Referring now to the switchin,,-- means B, the same comprises, in the present illusbrative disclosure, a switch arm 50 positioned between a pair of spring fingers 51, 52. The switch arm 10 aiid fingers are secured to a lamir@ated insulator block 53 which is secured to the base 15 as by means of a bracket 53' and bolts 54. The switch arm, adjacent its free end, carries a double co--,itact 55 adapted to alternately engage contacts 15 56 ond S'l respectively secured to the fingers 51 and 52 adjacent the free ends thereof. The fin--er 51, the switch arm 50, and the --Fin.@er 52 may be respectively connected to the terminals 58, 5 , and 0 of e power c it. 20 The switch arm is moved from one position to the other by the cam assenfioly C actiiig through a lever or arm 6 I which is pi-voted at one eiad on a T)ivot 62 f-ixed to and depending from the bracket 18. The lever 6 1, at its free end, has a 25 pair of depending cylindrical studs BP, formed of iiisuloting material, and these studs are in straddling relation to the free end of the sw,.tch arm 50 beyond the contact 55 carried thereby. Depeiiding from the lever 61 c@nd loc,,),ted between 30 the ends thereof is a follower pin 64 Nvhich is resiliently urged towards the peiiphery of the com assembly C by a spring 65 coiled about the pivot pin 62 and having its opposite ends respectively anchored to the lever 61 and the 35 bro,eket 18. The cain asse.,7nbly C comprises a cam disk 70 fixed to a vertical shaft 71, and a supplement,,il disk 72 journaled on the shaft 71 for lir-riited rotary movement with respect to the disic 70. 4:0 The shaft 71 is journaled in a vertical sleeve 67 carried by the bracket 18. F,,ixed to the upper e-nd of tbi-S shaft is an arin 68 in which the pin 41 is f-ixed and -,vhich pin, as previou-sly stated, engages betv@een the collars 30 and 40 of the armature 36. In order to permit of lost r-notion between the disl,,s 70 and 72, the disk 72 has a slo'(-, -t3 into which extends a pin 74 depeiiding -Irom the disk 70. The disk 70 has a notch with a generally radially extending edge 75 and a carii [,,,D or sloping edge 76. The disk 72 is of slighl@-ly larger diameter than the disi-@ 70 r@n(l, it has a notch with an edge 77 correspondiiig to, a,,id adapted to regis-uer with, the edf@,e 75 when the pin 64 is engaged in the bottom of the notches, r,5 and a generally radially extending edge 7@P. W-"th this arrangeinent, when th-- caiii assembly is .-otated counter@-locl@wise with respect to r@ig. 8 (and which movement, in the present 4,nstance, takes place on the impulse stroke of thp- armature 60 of the solenoid), ihe car-q edge ',G egms the pin 64 outwardly so as to move the conteet 55 ou@o of engagement with the contoet @7 and into engagewent vrith the contact 56, a7.id theii the pin ergages against the periphery of the disk 72. on 6,@) reverse rotation of the cai-n disk 70 (which tgkes place as the armature is moved to the left in Fig. 7 under the influence of the spring 39) the disk 72 is held stationary (dlie to the arrangement of the pin 64 agaiiist the periphery there70 of) until the pin 74 engages the other end of the slot 73 and then the t,@vo disks rotate to-@ gether until the pin 64 rides off of the periphery of the disk 72 and into the notch in the disk 70 to the position shoivn in Figs. 8 and 10, whereupon 75 contact 55 is moved out of engagement with con-

5 tact 56 and into engagement with contact 57. Referring now to the timer device D, the same is shown, for purposes of exemplification, as comprising a clock mechani.sm provided with an arbor 85 joi-irnaled in bearings provided in frame plates CO and 87 maintained in spaced relation by pillars @8. The arbor is in general axial alignment with the shaft 7 1. l@lixed to the arbor is a main gear 89 which is connected through a gear train 90 to the escapement wheel 91. Cooperatin- with a teeth of this escapement wheel are the pins 92 of the usual pallet wheel 93 whereby the speed at which the clock arbor is driven in one direction is controlled. Fixed to the arbor 85, and located beneath the lower fraine plate 87, is a ratchet wheel 95. Cooperating with the serrated edge of this ratchet wheel are two sprmg pressed pawls 96 (see Fig. 11) carried by an arm 97 journaled on the lower end of the arbor 85. In the e-mbodiment shown ill Figs. I to 12, the pawl carrying arm 97 has between its ends a hole 98 through which closely extends the upper end of the pin 41 so that the pawl carrying arm 97 and the arm 68 swing sub., stantially in unison. The operation of the device shown in Figs. 1 to 12 will be readily understood from the foregoing description talcen in connection with tho. following explanation: It may be assumed that when the parts are in the position sho-wn in the drawings, the switch means B is in closed condition and no current is passing through the coil of the solenoid. Upon energization of the solenoid, the armature 36 thereof will move on its impulse stroke, that is, towards the rigl-it referring to Fi-gs. 6 and 7, and, due to the engagement of the collar 40 with the pin 41, t-he cam assembly will be rotated counterclockwise, wit!-,i respect to Fig. 8, with the result that the follower pin 64 will ride out of the notches of the di-Sks 75 and 72 of the cam assembly thereby moving the switch arm 50 from the position shown in Fig. 8 to a position where the contacts 53 ard 56 are engaged. At the same time, the pawl carrying arm 97 is moved on its inoperative stroke, that is, counterclockwise with respect to Fig. 6 and clock,@vise with respect to '.,,Iig. 11, and during such movemelit, the pawls will ratchet over the ratchet wheel 95. These parts will retain these positions until the solenoid is deenergized. Upon stoppage of the armature during its operative stroke, there is a tendency for the pin 4 1, th,- arin 63, the cam assembly, and the ratchet lever 97 to continue to move due to their momentum, and if this were allowed, overtiming would resulb and the timing would vary widely. In order to prevent this, the stop collar 44 is provided on the armature stem between the collars 37 and 38. This stop collar is of such length that, -,ithen it is engaged between the collars 37 and 38, the collar 38 will be spaced from the collar 40 at a distance equal to the diameter of the end of the pin 41 engaging therebetween. That is to say, when the armature is in its inner or righthand position, the collars 38 and 40 will bear the same position relative to one another that they do when the armature is in the outer or !-,fthand position shown in Mgs. 7 and 12. Upon de-energization of the solenoid, the spring 39 associated with the armature thereof Nv,ill move the armature on its return stroke, that is, towards the left referring to Figs. 6 and 7, and, due to the fact that this spring urges the collar 3 8 against the pin 4 1, the cam assembly is 2,677,029 6 Figs. 6 tog. The speed at which the earn assembly is thus driven is, however, controlled by the timer device so that there is a predetermined time delay between the de-energization of the solenoid r) and the operation of the switch. It is observed that on the return stroke of the armature, the spring 39 drives the clock train through the collar 38, pin 41, pawl carrying arm 97, pawls 96, and the ratchet wheel 95, and the escape10 ment, comprising the gear train 90, the escapemeiit wheel 91 and the pallet wheel 93, determines the speed at which the c!oGIc mechanism is driven. Referring now to the embodiment of the in35 vention shown in Figs. 13 to 19, inclusive, the arrangement is similar to that just described but provision is made for changing the time cycle at will. In tlqese figures, the solenoid is shown only in part, and the cam assembly and the switch 20 means are not illustrated, it being understood that these instrumentalities may be similar to those illustrated in Figs. 1 to 12. Where the parts correspond to similar parts of the previous embodiment, like reference numerals are em25 ployed but the numerals are primed. In this latter embodiment of the invention, the pin 4 1', instead of passing through an opening in the ratchet pawl carrying arm 97' is adapted to engage that edge of the arm which 30 faces away from the coil 30'. The crank arm 68', which carries the pin 41', is provided at its free end with a tooth 100 with which cooperates alatchiOlpivotallyearriedbythearm971. The crank arm 68' is fixed to the vertical shaft 7 1', 35 the lower end of which carries the cam assembly as in the preceding embodiment. The lower end of the pen 411 engages between the collars 38' ar-d 401 on the stem 36" as in the preceding embodiment. The timer device D' is similar to tlipt 40 previously described. The latch IO 1 is pivoted on the lower end of one of the studs 102 employed for pivoting one of the pawls 96' to the arm 97'. This latch is in the form of a bell crank, one arm 104 of whicli 45 is provided with a tooth 105 which is adapted to cooperate with the tooth I 00 on the crank arm 68' as shown most clearly in Fig' 17. On the inner edge of the arm 104 is an extension 106 adapted to engage a lug 107 depending from the 50 arm 97' for the purpose of limiting the inward swinging movement of the latch. The other arm 100 of the latch is adapted to engage an adjustable knock-off pin I 10 so as to release the lal@-ch from the crank arm at the termination of the 55 selected time period. The latch is normally urged clockwise with respect to Fig. 17 by a spring I i 1. The latch trip or knock-off pin I IO is carried by an indicator arm i 12 which is pivoted luo a stud 113 on an indicator plate 114. The pla@,e (o 114 is secured to the top plate 8611 o.@' the tiniermechanism, and the pivot stud 113 is in alignment with the arbor 851 of the timer. The plate 114 is offset upwardly between its ends so as to accommodate between itself and the plate 86' the 65 indicator arm. One edge of the plate II 4 is pro vided with a scale which, in the present instance, is formed by notching the plate as at II 5. The outer end of the indicator arm is provided with a pointer I IS for cooperation with this scale. 70 For the purpose of locking the indicator arm in any desired position of adjustment, the plate I'@4 is provided with an arcuate slot II 7 which accommodates a lock screw or bolt I I 8 carried by the indicator arm. driven in a clockwise direction, with respect to 7r) The operation of the device shown in Figs. 13