US2056400A - Time switch - Google Patents

Description

oct. s, 1936. F. Q HOLTZ y 2,056,400

' TIME swITcH Filed Feb. 6, 1933 3 Sheets-Sheet l IWL Oct. 6, 1936.

vF. c. HOL-rz- TIME SWITCH Filed Feb. e, 195s 3 Sheets-Sheet 2 J7? vena l f'edn'df O ZZ'Z. f-B/H/ mlw, ma. ,5.

Oct. 6, 1936. F C, HOL-r2 2,056,400

TIME SWITCH Filed Feb. 6,V 1953 3 Sheets-Sheet 3 Patented Oct. 6, 1936 UNITED STATES y z,0ss,40o

'man swrron Frederick C. Bolts, Springfield, Ill., assignor to Sangamo Electric Company, Springeid, Iii., a

corporation oi' Illinois Application February 6, 1933, Serial No. 655,355

23 Claims. (Cl. 20D-39) 'I'he present invention relates to time switches.

In one embodiment oi my invention herein shown, the device is particularly adapted to function as an electric range timer for automatically s turning on the heating element of an electric range at any selected time and for automatically turning oi! this heating element at a later selected time; and in another embodiment of my invention herein shown, the vdevice is particularl ly adapted to function as an interval timerfor opening or otherwise controlling a particular circuit yat the expiration of a definite time interval, which time interval can be accurately predetermined based on comparatively short umts of vlli time. While the above embodiments are the preferred constructions and uses of my invention, nevertheless it will'be understood that my invention is not limited thereto but can also be embodied in other constructions and used for go other purposes.

The actuation o f the switch contacts is gov-A yerned by a control member which is initially c moved in one direction into a set position by manual operation. Spring means normally tends to move this control member in the opposite direction, back to a normal position. It is this spring actuated return movement of said control member which actuates the switch contacts at the selected predetermined time or'times.

This return movement is `governed by time controlled'tripping or releasing devices which can be given any desired time setting.

One of the objects of the invention is to prov vide an improved construction of time switch' wherein this return motion of said control member occurs in two stages or steps. Assuming the control member to have been manually moved into its set position. the nrst tripping step occurs at the end of a predetermined time interval and allows the control member to move back' part way through its return motion. It is held at this point until the expiration of a second'time interval, whereupon the second tripping or releasling device permits said control member to move back through asecond stage of its return movement. In the, electric range timer embodiment of my invention. this two-step operation is utiliaed to predetermine the times when the switch goes into the lOn position and goes into the "08 position; and in the interval timer embodiment of my invention this two-step operation is advantageously utilized by having the first tripping operation respond to relatively u large divisions of time and by having th'e second tripping operation respond to relatively small subdivisionsof time.

Another object of the invention is to provide an improved arrangement whereby the switch contacts can be manually tripped into closed po- 5 sition in the event that the meer should desire to control the circuit by a manual switch at some other point. In the preferred embodiments herein shown, this manual tripping' of the switch contacts to closed position is enacted by a third l0 stage of return movement of said control member, this third tripping operation being effected manually. 1 A

Another object of the invention is to provide an improved time switch of the abovegeneral l5 description wherein the time tripping functions can be quickly and easily adjusted to different time intervals from the exterior of the device, and wherein the switch can be quickly and easily, tripped in the manual tripping operation, so 20' that the housewife or'other user can perform these operations without complication or inconvenience.

Another object of the invention is to provide an improved construction and arrangement of 25 the two time controlled tripping devices and their associated timeresponsiv'e driving members, relatively to which the tripping devices can be given different time settings.

Other objects and advantages of the invention s0 will appear from the foll g description of two preferred embodiments o my invention. In the accompanying drawings trating such embodiments-f Figure 1 is a front elevational view of the 35 range timer embodiment of my invention;

Figure 2 is a rear elevational view of thel same, with portions broken away;

Figure 3 is a sectional view on an enlarged scale, taken approximately on the plane of the 40 line S-I of Figure 1;

Figure 4 is a fragmentary perspective view,- with portions broken away;

Figure 5 is a detail view of the control arm. illustrating the pivcd mounting of me latch 45 thereon;

Figures 6, '1, 8 and 9 are diagrams illustrating successive positions of the switch control member and the relations of the switch contacts in each 5o of these positions of said control member;

Figure 1 0 is a front elevational view of the interval timer embodiment of my inventiom' Figure l1 is a iront view with the lower portion of the casing or supporting frame broken u away to illustrate the gear train, tripping parts, etc.: and

Figure 12 is a horizontal sectional view on an enlarged scale, looking upwardly as indicated by the line i-IZ of Figure 11.

The main frame structure of the device com= prises front and rear frame plates it and is which are fastened in spaced relation by corner.

the device is assembled in a casing or is built into an electric range, the enclosing wall extends to this finishing bead 2l.

The clock 25, 2t may be of the spring=wound type, electric motor driven type, or ci the secondary type, receivingimpulses from a master clock or other control source. In the embodiment disclosed, I have illustrated a motor driven type of clock, comprising a self-starting synchronous motor 8l, particularly for installations where alternatingA current is available. This motor ti may be mounted on thebaclr side of the rear frame plate it, as shown in'mgure 2. The driving train from the electric motor to the clock hands, and such other details oi the cloch-move= ment, have not been illustrated because the same are old and well known. .A second hand 26 iFlg= ure 1) or a second disc 2t", (Figure lil) is pret= erably provided to indicate whether or not the cloclr is operating. In the range timer embodi ment illustrated in Figures l-Ji, a gear 532 transe mits thrncdv motion from the clock movement to 'fthe tripping parts associated with the switch bach side of the rear frame plate it. The L= shaped supporting bar 35 for the contact 8d holds said contact in substantially stationary relation,

while the L-shaped supporting bar 3o for. the bottom contact til can be forced or sprung downwardly forseparating the contacts. .el copper conducting strip il@ aids in carrying current to the movable contact, and a reenforcing bar 33 prevents flexing of the horizontal leg portion ci. supporting member 36. .ii/strip of insulationl lil is secured to the top side of this horizontal leg, and the cam 35, which actuates the switch, is

i adapted to contact with this strip of insulation.

The conductors of the circuit to be controlled are adapted to be connected to the terminal screws d@ threading into the terminal blocks tl, sa. A rear insulating panel #il is suitably secured to the back sides oi said terminal blocks, for enclosing the rear portion oi the switch structure. The conductors fit of the electric motor di may be connected to the terminal screws de, or, wherev independentV circuit connections for said motor are desired, these conductors, or one of them, may

accesso be extended Ato e. terminal post, er posts.l de, mounted on the rear insulating'panel dl.

The cam d5 is oscillated into its diferent poshtlons by a switch control member designated di in its entirety. This control member comprises a shait dla, an oscillating arm dit iinedly secured to said shaft, a latch die pivotally mounted on the outer end or said arm, and an actuating knob lation of the shaft 5ta these are presented successively in a sight Window 5d provided 'in the lower portion of the face plate 22.

The arm lith is secured to the shaft Eta at a point between the two frame plates I8 and it. Referring to Figures d and 5, said arm has a spoolshaped huhportion l' which is rigidly secured to the shalt Sie, as by pinning or in any other suitable manner, whereby the arm oscillates with the shaft and also moves bodily with the shaft in the amai shitting movement of the latter. A

coil spring 5d is conned around the shaft be= tween the hub 5l and the back plate' iii. The iront end oi said spring is extended outwardly and provided with a hooked extremity 58' which hooks over the side edge oi the arm dit. The other end 5d" ci said spring bears against the stop pin E@ projecting forwardly from the' back plate itl. Said spring acts as a torsion spring, normally tending to swing the switch control assembly die, Elib, in a counterclockwise direction (as viewed from the iront of the device). and it also serves as a compression spring re= acting against the baclr plate i9 and tending to thrust the control assembly forwardly.

The latch or dog die is pivotally mounted for sidewise swinging movement on the outer end oi arm Eib, oscillating about a pivot stud or'screw di which is secured to the arm. The normal position of said latch or dog is with the outer beveled nose portion Sie extending outwardly sub stantially in prolongation of the arm Sib. .es in-a dicated by the dotted line position in Figure 5, said latch can swing in one direction relatively to this normal position, such swinging motion being against L the pressure ci a coil spring @2. The outer end oi said spring passes through an aper= tured lug @if on the dog and the other end oi the spring is hoolredover the side oi the arm till, the intermediate convolutions of the spring being coiled about the forwardly projecting portion oi the hub 5l. A stop shoulder dlg projects backn .wardly from the opposite edge of the dog for engaging the baci: edge of the arm cib, this stop preventing swinging motion of the dog in the oppositedirection from its normal position, and the action or? the spring 62 being such as to nor= molly hold this stop shoulderagainst the arm cib.

Figures 6,- ?,78 and 9 diagrammatically illus@ trate how the switch control member @l con operates with three' tripping or releasing members t5, @d and @l which are grouped substantially concentrically about the rotative axis of the con trol member 5i.' The tripping members t5 and et are time responsive; in the preferred construe tion illustrated, they consist of rotating shafts which have geared connection with the clock. Cut in said shafts are notches tta and Soc, respec titiV only. 'mess m. man t ad n mais is the counterclockwise direction indicated, and when lthe bottom'of. the notch in one of these shafts outer extremity of the dog llc. Itwill be seen from the foregoing that when the shafts Il and t8 are in any rotated positions other than with-their notches Ila and a substantially tangent to the arc A, the control member li can be latched behind these shafts, with the dog lic engaginga solid part of the shaft. Figure 6 illustrates the set position of the control member to which it is moved manually in a clockwise direction, and as the control member passes eachofthe tripping members l5. ll and l'l in being swung to this set position, the dog lic oscillates on its'pivot screw li in passing each of the tripping members. When the control member is in the position illustrated in Figure 6, with the dog die engaging a solid part of the shaft Il, the coil spring I8 is tending to swing said control member back through its return movement in a counterclockwise direction. Therefore, as soon as thenotch o rotates to a position of tangency, the control member il is tripped or released and allowed to swing to the position illustrated in Figure 7. where the dog engages a solid part of the shaft As soon as the notch a of this shaft arrives in a position of tangency. the control element is again tripped or released and allowed to continus through a second step of return movement, until the dog strikes the third tripping member l1.

The tripping release between the control member andl this third stop l1 is preferably effected by relative endwise movement between the control l member land said stop member. In the preferred construction, the stop l1 consists of a short pinv rigidly anchored in the front frame plate il and projecting rearwardly therefrom, and the control member ll is tripped from said stop by pressing inwardly on the knob lib, thereby lthrusting the swinging arm and its dog llc inwardly beyond the end of the pin I1, whereby the latter is cleared andthe control arm Ib can continue through a third stepof return movement down to its final position illustrated in Figure 9. In other possible alternative constructions, the pin l1 might be arranged for the tripping movement. as by providing a knob on the outer end thereof and arranging said pin for sliding or rotating movement, so as to enable the inner end of the pin to be withdrawn from the path of the dog llc, or so as to enable a notch in said pin. similar to the notches Ila, "a, to be slid or rotated into the path of the said dos.

Figures 6 to 9, inclusive illustrate the construction of cam 4l which is used in the rangetimer embodiment of my invention. from which it will be seen that when the control member is in the position illustrated in Figure 6, the righthand lobe lla of the cam is holding the 'switch contacts Il and M separated: when the control element is in the position illustrated in Figure 7, the switch contacts are permitted to engage; when the control element is in the position illustrated in Figure 8. the lefthand lobe "b of the cam holds the contacts' separated; and when the control element is in the position illustrated in Figure 9, the switch contacts are permitted to engage.

The two notched tripping shafts ll and II have suitable bearing support in the front and rear frame plates I8; Il.' the notches Ila and d in 'said'shsfte lying in 4the plane of theeontrol arm' lib between said frame plates. Mounted on said shafts, and rotatable with respect thereto, are

two spur gears Il and 12. These two gears both mesh with the aforementioned gear I! which is disposed on the front side of the front frame plate I8. The gear 32 is operatively connected through suitable gearing with the clock movement and, hence, the two spur gears 1i and 12 are both driven continuously at a time controlled speed.

- Said gears 1| and 12 function as time responsive driving members for driving the shafts 0l and Il, The driving connection between each of these gears and its respective shaft is a friction slippage connection, being identical in the case of both shafts. Referring to Figure 3, the shaft Il is formed with a reduced bearing portion, Athe front edge of which defines a shoulder b projecting from the ront frame plate I8. A friction spring l, in the form of a cupped washer or spider, is confined between said shoulder b and he. adjacent side of the ge'ar 1i. This spring is maintained under continuous pressure so that it functions to transmit a drive from gear 1i to shaft Q8 by friction. The shaft 85 is formed with a reduced extension Btc projecting forwardly from the shoulder 55h, and the companion shaft lt is formed with alike reduced extension. Each of the two gears 1i and 12 has a sleeve 14 rigidly secured to its respective gear and rotatably' mounted on this shaft extension. Secured fast 3 to the outer-end of the sleeve associated with the gear li is a rotating dial or disc 18, and secured to the sleeve associated with the other gear 12 is a like rotating dial 11. As shown in Figure l, these two dials rotate in circular apertures cut in the face plate 25, and marked on the faces of said dials is suitable time indicia 10', 11'. In a range timer embodiment of my invention, the two dials 1I and 'l1 are geared to make one complete revolution every twelye hours and, accordingly, in such embodiment, the scale markings 1l', 1'|' represent twelve hours, with minor subdivisions oi' 15 minutes or less. It will be understood that in other embodiments the geared rela'- tion of the dials to the time piece may be arranged for a higher or lower rotative speed, and the dial markings would then vbe modined accordingly. Fixedly secured to the outer ends of the reduced shaft extensions llc and ttc are pointers 1B and 1l' which cooperate with the dials It and 11. Printed on the face plate 2l adjacent to the rotating dials are two datum marks Il and l2 which cooperate with the pointers 'Il and Il in indicating whenithe automatic tripping operations willl occur, i. e., when the two pointers are aligned with their respective marks lli and l2, the notches lla and "a are in their tangent positions fontripping the control member il.

A pin Il is passed through each of the reduced shaft extensions "c, tic, and has its ends bearing against a washer Il mounted in front of each s dial 1I, 11. This pin and washer arrangement iusting knobs are secured to the outer endsof shafts I1 and l), respectively, which have bearing support in the' front and rear frame plates Il and II. Secured to the inner portions of these shafts are spurgears Il and Il, respectively. whichmesh acecho@ with spur gears t3 and @t which are rigidly secured to the shafts t and 58, respectively. 'Etotation of the knob et is eiective through gears @i and Se to adjust the tripping shaft 65 to bring its notch 65a and pointer i8 into any desired anguiar position, the time responsive driving gear il and the associated dial it meanwhile remaining substantially stationary during such adjusting operation by reason of the friction slippage connection it; and adjustment of the other knob @tl is eective through gears 92 and Se to adjust the other tripping shaft S6 to bring its notch @6a and pointer l@ into any desired angular position, the time responsive driving gear l2 and the associated dial il also remaining substantially stationary during this adjusting operation by reason Yof its friction slippage connection it.

The operation of the above described embodiment is as followsz--Assuming that the housewife desires to havethe particular heating element of the range go on at three oclock and to go off at six o'clock, she turns the knob @5 to rotate the pointer l into registration with the 3 marking on the "On dial it, and turns the knob Sti to rotate the pointer i9 into registration with the 6 mark on the "Off" dial lvl. With these two time settings established, she thereupon revolves the setting knob bld to swing/the control member 5i to its extreme righthand position, as illustrated in Figure 6. In this position, the switch contacts 33 and tt are open. During the continued rotation of the gear li in response to the operation of the clock movement, the shaft 55 is carried around with said gear through the friction clutch connection it, and when the 3 mark on the dial 'it and the pointer l reach the mark Bi, the notch @Ea in said shaft is in its tangential position and thereupon the control element 5i is snapped back through the first-step of its return movement, into the position illustrated in Figure 7. in this position the switch contacts are closed, thereby closing the circuit of the range. Meanwhile, the shaft t@ has also been rotating with its time responsive driving gear l2, and when the 6 mark on the dial il, and the pointer li-l, come into substantial registry with the stationary mark t2, the notch @da of said shaft is in its tangential position, and thereupon the control member 5l is permitted to snap through the second step of its return movement, into the position illustrated in Figure S. In this position, the switch contacts are open. This completes the cycle of automatically closing and opening the circuit at predetermined times. As the control element 5i moves between each of the positions illustrated in Figures 6, 7 and 8, the indicia Set, 0n and Off on the target disc 52 appear successively in the sight window @il so that the housewife can tell instantly the condition of the time switch.

In the event that she should wish to close the switch contacts 33, 3d, and have them remain closedindependently of time, it is only necessary l -for her to press inwardly on the setting knob tid, which serves to thrust the shaft 5ta and arm dit inwardly in opposition to the pressure of the spring 5t, thereby causing the dog dic to ,clear the inner end of the xed stop el, so that the control element can swing down through the wife desires to have the switch closed at once,

with the device only functioning to automatically open the switch at theexpiration of a given time, she may set only the Off dial 'ill for this time interval and then turn the setting knob Qld only to the "On position, with the control -member @i latched behind the shaft et. At the expiration of this set time interval, the switch will automatically open. f

Referring now to the interval timer embodi- `ment illustrated in Figures l0, l1 and l2, this front and back frame'plates i8 and i 9. Fixedly' secured to the front ends of these shafts 65 and t@ are the two indicating dials till and HB2. ln the embodiment illustrated, the above described gear ratio between said shafts is such that the shaft 66 revolves 12 revolutions to each revolution of the shaft 65. Corresponding to this gear ratio, the markings it' on the dial iti represent one hour of time divided into five minute intervals, and the markings E32' on the other dial m2 represent i'lve minutes of time divided into one minute intervals. This enables the time interval to be set forany time up to one hour in one minute gradations, or even smaller. It will be understood that in different embodiments and uses of the invention, the gear ratio and the time intervalsmay be otherwise arranged, appropriate to that embodiment or use.

Motion is transmitted from the clock movement to the two trippingshafts through a gear i6@ which meshes with a gear it mounted on the shaft t6. The latter gear it constitutes the time responsive driving element for the two shafts, the motion transnriitted thereto being such asto cause the shaft E5 to rotate once in an hour and to cause the shaft t@ to rotate once in five minutes, as abovedescribed. A friction slippage clutch is interposed between the gear it and the shaft 65, this clutch connection also consisting of a spring spider tilt (Fig. 12) similar to the spring spiders it of the preceding embodiment.v rihe ends of the spider arms bear against the back side of the gear it and the hub of the spider bears against a collar itl on the shaft tt. This friction slippage connection permits the two Vshafts to be given their manually adjusted settings, but at other times compels these shafts to rotate in response to the operation of the clock.

Both shaftsare set simultaneously by the manipulation of one adjusting knob il i, which is secured to a shaft M2 journaled in the spaced frame plates. `A gear il@ secured to this shaft meshes with an idler ,gear itil, which in turn meshes with the pinion 96, the idler gear being mounted on a suitable spindle or arbor i i5 journaled. in the frame plates.

The oscillatory control assembly di is substantially the same as that previrmslyv described, with the exception of the cam 35, which has only a single lobe 350. The third stop is also provided for the control member, in the form of a pin Si, like that previously described, from which the control member can be released by pressing inwardly onthe knob id. The dials iti and it are designated 2 and i, respectively, on the face plate of the clock. Corresponding thereto,

the target disc l2 bears the successive indicia:

0n-J2", On-1, Off";.followed by the red tara get area |53.

In the operation of this embodiment, it will be assumed that it is desired to close the circuit through the contacts 33 and 34 and to have this circuit open automatically at a predetermined time interval later on--say 43 minutes. Preparahand position, where it becomes latched behind the shaft 65. The indicia "On-2" now appears in the sight window I4, indicating that the time computation is based on the settings of both dials. As shown in Figure 11, this position of the control member disposes the cam lobe lic out of engagement with Vthe movable switch element, with the result that the switch contacts are in engagement and the circuitwis closed. The dials lili and |02 are rotated in their timed movement in a counterclockwise direction, back toward their zero positions, and the notches are so related to their dials that when the O mark of the dial Ml is approximately in register with the arrowhead pointer 8|, the notch a will be in tripping position, and, likewise, when the "O" mark on the dial |02 is in register with this arrowhead pointer 82, the notch 88m will be in tripping position. It will therefore be seen that substantially at the expiration of 40 minutes or slightly more, the control member 5| will be tripped through the iirst notch aethereby swinging back intoengagement with the other shaft B6. This still leaves the switch contacts closed because the cam lobe has not engaged the movable switch element. The latter g shaft and its dial |l2 have meanwhile been rotata short time interval of five minutes or less, this setting is established on the 1 dial, designated |02. For example, if only a B-minute interval is desired, the ,3 on that dial is placed in register with-the fixed marker 82. Thereupon, the

setting knob lid is rotated through only the nrst step of its setting actuation, sumcient to latch the control member in engagement with the shaft At'this time the indicia "On-1" on the tar-- get disc appears in the window Il, indicating that the time setting is based on the indication of the 1 dial. At the expiration of three minutes,

thesero mark on this dial will have returned to the'nxed marker I2 and the control element will be tripped for swinging back to its switch opening position in engagement with the stop Il.

Attention is vdirected to the fact that vthe use of two trlppinl shafts' for controlling the opening of the switch has a two-fold advantage; first, it enables greater accuracy to be obtained in the automatic tripping operation, and, second, it enables small time intervalsto be more accurately established in the setting of the device. Referringtotheiirstoftheseadvantageatheshaftil' is given a slight lead of operation over the shaft 66 so that for any time setting ci' more than iive minutes, the shaft 65 will be sure to trip the control member before the shaft E8 has arrived in its tripping position. Thus, the ilrst shaft only determines the large gradations of time, and the second shaft determines the short gradations ci time. Inasmuch as this second shaft 68 has e. ro`` tative speed twelve times' as high as the first shaft, a much higher degree of accuracy for the short gradstlons of time can be had from this second shaft, thereby avoiding the necessity of extremely accurate machining operations -and. avoiding errors from gear backlash, wear, etc. With regard to the second of these advantages, it will be evident that the large scale division of the second dial |02 into one minute intervals enables the operator conveniently to set the device for accurate time gradations over either long or short intervals.

When the control arm is in its Oil position,

against 'the stop 81, the Oii indicia on the target disc appears at the window 5i. Likewise, as in the previously described embodiment, when the operator desires to close the switch for a utilization of current independently of time, it is only necessary to press inwardly on the setting knob Bld to cause the control arm to clear the inner end of the stop pin 6l, whereupon the control member swings downwardly to the limit of its counterclockwise movement, oscillating the cam lobe Mc out of engagement with the movable switch element and permitting the switch contacts to close. In this position, the red target area 53 appears in the sight window 54, indicating that the switch is closed.

While I have illustrated and described what I regard to be the preferred embodiments of my invention, nevertheless it will be understood that such are merely exemplary and that numerous modincations and rearrangements may be made therein without departing from the essence of the invention.

I claim:- I l l. In a time switch, the combination of contact apparatus, a control member governing said contact apparatus, said control member adapted to be moved from a normal position to a set posiv tion, means normally tending to cause a unidirectional return motion of said control member from said set position back to said normal position, tripping stops disposed at different polnts'in the path of such return movement-"time responsive drivingmeans for actuating said tripping stops to release said control member, frictional motion transmitting means between s aid time responsive` driving` means and said tripping stops, and means for settingsaid tripping stops relatively to said time responsive driving means. A

2. In a time switch, the combination of contact apparatus, an automatic control member, means responsive to the motion 'of said control member for governing said contact apparatus, said control .member adapted to be moved from a normal position to a set position, meansv normally tending to cause a return motion of `'said control member from said set position back to said normal position, tripping shafts operative to control said return motion. said shafts having notches therein movable into releasing positions for releasing said control member, time responsive driving means apparatus, an automatic control member. vmeans responsive to the motion ci said member for governing said contact apparatus, said control member adapted to be moved from a normal position to a set position, means normally tending to cause a return motion of said control member from said set position back to said normal position, a plu=` rality of tripping shafts disposed at dierent points in the path of such return movement for causing such return movement to occur in a plurality of steps, said shafts having notches therein movable into releasing positions for releasing said control member, time responsive driving means for said tripping shafts. frictional means for transmitting motion from said driving means to said shafts. and means for setting said shafts relatively to said time responsive driving means.

fi. In a time switch. the combination of contact apparatus. an automatic control member, means responsive to the motion oi said control member for governing sid contact apparatus, said control member adapted to be moved from a normal posi tion to,a set position, means-normally tending to i cause a return motionof said control member from said set position baclr to said normal position, a tripping shaft for holding said controly member in said set position, a second tripping shaft operative to interrupt the return motion of said control member between said set posi`= tion and said normal position, said shafts having notches therein movable into releasing positions for releasing said control member, time respon= .sive driving'means for rotating said shafts, frica tional means for transmitting motion from said time responsive driving means to said shafts. and manually actuated means'ior setting said shafts in diderent angular positions relatively toA said time responsive driving means.

. In a. time switch, the combination of contact apparatus,.an oscillatory control member,

\ momiav responsive to the motion of said control member for governing said contact apparatus, manually actuated means for oscillating said control member from a normal position to a set i tively to said time responsive driving means, and

indicating means for indicating the settings im= parted to said shafts. l.

t. ln a time switch, the combination ci contact apparatus. a'control member governing said con tact apparatus, said control member adapted to be moved in one direction to a set position, means normally tending to cause a return motion or said controlmember from said set position, a drst stop member governing said return motion. time responsive means for eecting an automatic release between said iirst stop member and said control membena second stop member governsV i ing said return motion, and manually actuated means for edecting' a release between said second stop member and said control member.

7. ina time switch, the combination oi contact apparatus, a control member governing said con@ governing said return accenno tact apparatus. said control member adapted to be moved in one direction to a set position, means normally tending to cause a unidirectional return motion of said control member in the opposite direction back from said set position, a rst stop member governing said return motion, time responsive means for eecting' an automatic releasebetween said rst stop member and said control member, means for adjusting the position of said rst stop member relatively to said time responsive means. a second stop member Vgoverning said return motion, and manually actuated means for enecting a release between said second stop member and said control member.

8. In a time switch. the combination oi' contact apparatus, a control member governing said contact apparatus, saidcontrol member adapted to be moved from a normal position to a set position, means normally tending to cause a return motion of said control member from said set position back. to said normal position, a plurality of tripping stops disposed at diierent points in the path of such return movement for causing the return motion to occur in a plurality of steps,- ,time responsive driving means for actuating said tripping stops to release said control member, means for setting said tripping stops in dinerent tripping positions relatively-to said time re sponsive driving means," anthen stop member l otion, and manually actuated means for effetxsling a release between said latter stop member and said control member.

9. In a time switch, the combination of contact apparatus. a control member governing said contact apparatus. -saidcontrol member being movable in two diilerent planes, a. time controlled tripping device operative to govern the motionoi said control member 'one plane, time responsive driving means for said tripping device, a

:ail

stop member for governing the motion of said trol member in the other plane for eecting releasel between said stop member and said control member.

controlmember, and means for moving said conl0. ln a time switch, the combination oi contact apparatus, a control member governing said contact apparatus and movable in two different planes, said control member adapted to be moved in one plane from a nrmal position to a set position, means norm tending'to cause a return motion of' said con ter plane from said set position back to said normalpontion, a rst stop member governing vsaid return motion, time responsive driving means for said nrst stop member adapted to actuate the latter into releasing position, means for setting said nrst stop member relatively to said time responsive driving means. a second stopV a return rotation of said shaftv from said set position'baclr to said normal position, a time 1responsive tripping device operative to control said l member in said lati I return rotation. a stop. member for interrupting said return rotation. andl means :or sliding said matically-eiecting release between said control member and a plurality of said stops, and manually responsive means for manually effecting release between said control member and one of said stops.

13. In a time switch, the combination of contact apparatus, a control member governing said contact apparatus, said control member adapted to have rotative movement from a normal position to a set position, means normally tending to cause a return rotation of said control member from -said set position back to said normal position, a plurality of -stops operative to interrupt said .return rotation at spaced points, time responsive means for automatically effecting release between said control member and one of said stops, and manually responsive means for manually effecting release-between said contro member and one of said stops.

14..I n a time switch, the combination of contact apparatus, control mechanism for said contact apparatus comprising a shaft, 'an arm on Vsaid shaft swinging about the axis of said shaft,

aplurality of tripping devicesrdisposed substantially concentrically relatively to said axis and adapted to have substantially continuous motiony during the normal operation of the time switch,va dog movably mounted on said arm and adapted to be latched behind said tripping devices when said arm is rotated in one direction, means normally tending to cause rotation of said arm in the opposite direction, rand time responsive means for actuating one of said tripping devices. 1

15. In a time switch, the combination of contact apparatus, a rotatable arm, cam means responsive to the motion of said arm for governing said contact apparatus, a rotatable shaft, a' latch member-mounted on said arm adapted to have latching engagement with said shaft when said `arm is swung to one position, and means normally tending to cause a motion ofsaidarm in a direction inyopposition 'to said latched engagement, said shaft comprising a recessed portion operative upon rotating into a predetermined position to release said arm. time responsive driving means for said shaft, ,frictional slippage means transmitting motion from said driving means to said shaft, and means for setting said shaft relatively to said time responsive driving means.

16.l In a timeswitch f or electric rangesfand the like, in combination, separable contact membersV es l* a set position for actuating said contact members from one circuit controlling position to the `disposed to control the connection of a heating element of the range to a current source, a control member movable from a normal position to other, means for biasingsaidv arm from said/set position to said normal position .in a reverse direction to that in which it is moved tov said set' position, a first tripping element operative to hold said control member in said set position in which said contact members are separated, timlshaft forlireleasing said control lmember from ing means operatively connectedto said tripping element for eiectingrelease of said control member to close said contact members at apredeter- .mined time, means for presetting said tripping element, a second vtripping element disposed 'to arrest said control member at an intermediate position in its return to said normal position therebyr permitting said contact members to remain in engagement as long as said control member remains in said intermediate position, means for operatively interconnecting said timing means with said second tripping element for effecting release of said control member to open said contact members at a predetermined time, and means for presetting saidv second tripping element.

17. Ina timel switch, the combination of contact apparatus, a control member governing said contact apparatus, said control Vmember adapted to be moved from a normal position to a set position, means normally tending tov cause areturn motion of said control member from said set position back to said normal position, a plurality of tripping devices operative to control said return motion, time responsive driving means for said tripping devices including means for driving said tripping devices at different speeds, and means for setting said tripping devices relatively to said timeV responsive driving means.

18. In a time switch, the combination of conf tact apparatus, a control member governing said contact apparatus, said control member adapted to be rnoved from a normal positionto a set position, means normally tending to cause a return motion of said control member from said set position back to said normal position, a pluralityY of trippingdevices operative to control said return motion, time responsive driving means-for said tripping devices including means for driving 'said tripping devices at different speeds, and

manually actuated settingmeans for. rotating one of said tripping devices relatively to said time responsive driving means:

19, In a time switch, the combination of con.

tact apparatus, a control member, said control member adapted to be moved from a normal position to a set position, means normally-tending to cause. a return motion from said set position `bacl': to said normal position in a direction opposite to movement to said set position, means responsive to said return motion for causing switching actuation of said Ccontact apparatus at a .point intermediate the limits of said return mov'tion and continuously rotating timeeontrolled releasing meansadapted to be engaged by said control memberl and governing said return motion.

' 20. In a time switch, the combination of contact apparatus, a control member, said control member adapted' to be moved from a normal po- ,sition to a set position, means normally tending t'ocau'se a return motion from said set position back to said normal position in a direction oppo- ,site` to movement to said set position, means responsive to said return motion for causing said contact apparatus to assume a circuit closing condition at one point intermediate the limits of said return motion and for causing said contact apparatus to' assume a lcircuit opening condition` at another point intermediate the limits of said return motion, and continuously rotating time controlled releasing means arranged to be engaged directly by said control member for gov- I erning said return'motion. Y 21. In a time switch, the combination of oontact apparatus, a'controi membergoverningsaid contact apparatus, said control member adapted to be moved from a normal position to a set position, means normally tending to cause a-return motion of said control member from said set position Back to said normal position, a continuously rotating rst holding device operative to control, one part of said return motion, a continuously rotatingy second holding'device operative to control another part ofsaid .return motion, each of saidvholding devices being rotatable into a releasing position, and time responsive means for governing the rotation of said holding .devices into their releasing positions.

22. In a time switch, the combination of contact apparatus, a control member governing saiclv Vcontactapparatus', said control member adapted to be moved from'ay normal position to a set position, means normally tending to cause a re. turn motion of said control member'from said' set position back to said normal position, a time responsive rotatable. driving member havingl substantially continuous rotation during the normai operation of the time switch, a mst holding device operative to control onev part of the return .motion of said control member, a second holding device operative to control another part of said return Imotion, mechanism for mechanically transmitting motion from said time responsive driving member to said 'ilistholding device, mechanism for mechanicallytransmitting motion iromY said timeresponsivedriving member to said -sec-v 0nd holding device, each of said kholding devices 'being actuated into releasing f position by said 5 time responsive driving member, and setting means for changing the Position of one of said holding devices relativelyvto said time responsive driving member for adjusting the time when said latter holding device is moved into releasing l0 position. 23. In a time switch, the combination offco'ntact apparatus, a control member governing said contact apparatus, said control member adapted to be moved from a normal position tol a set l5,

ing means for changing the setting of said trip- 20 ping device relatively to said time responsive driving device. .l

.' FREDERICK C. HOLTZ.

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