US2539138A

US2539138A - Cyclometer clock alarm

Info

Publication number: US2539138A
Application number: US742695A
Authority: US
Inventors: Arthur A Johnson
Original assignee: Casco Products Corp
Current assignee: Casco Products Corp
Priority date: 1947-04-19
Filing date: 1947-04-19
Publication date: 1951-01-23
Anticipated expiration: 1968-01-23

Description

Jan. 23, 1951 A. A. JOHNSON 2,539,138

` CYCLOIIETER CLOCK ALARII Filed April 19, 1947 I 2 Sheets-Sheet 1 Inn INVENTOR.

ATTORNEYJ' Jan. 23, 1951 A. A. l.JoHNsoN 21,539,138

CYCLOMETER CLOCK ALARM Filed April 19, 1947 2 Sheets-Sheet 2 A 1 I .evs 1 INVENTOR. Arlur A. Johnson BY ATTORNEYS Patented Jan. 23, 1951 CYCLOMETER CIDCK ALARM Arthur A. Johnson,Bridgeport, Conn., assignor to Casco Products Qorporation, Bridgeport, Conn., a corporation of, Connecticut Application April 19, 1947, Serial No. 742,695 33` Claims. (Cl. 58-19) and more particularly to an alarm or switching mechanism for cyclometer clocks.

The invention is shown as embodied in an electric clock of the cyclometer or direct-reading type, for controlling the alarm mechanism thereof. However, it should beunderstood that the invention is not to be limited to a clock or to the speciilc embodiment shown, sinceit has utility in connection with cyclometer devices generally, wherein intermittently movable members v or counters are `provided having different rates of advance. f

' One oi the objects of the inventionis to provide in a cyclometer device, which may be a clock, an improved settable switching or alarm-control mechanism actuated by the device, said mechanism having but a single manually operable member which is settable by a simple, continuous movement, the setting of the member governing both the hour and minute interval at which the mechanism `will be actuated by the device. l

Heretofore I have provided a circuit control or alarm mechanism for cyclometer-type clocks, so organized that in setting it an operator was required to actuate or manipulate several settable members, and this made the setting operation more lengthy and somewhat more complex and susceptible oi' error than. for example, was the case in the usual clock having the conventional minute and hour hands and numbered dial. In these conventional clocks, since a very slow-moving shaft was present (the hour" hand shaft) which had a continuous rotation and which by its rotative position alone could indicate the time of day, it was a simple matter to provide a settable trip device which had but a single manually operable member, and to arrange the device to actuate the alarm with reasonable accuracy. In cyclometer-type clocks having intermittently movable parts, however, no such continuously and slowly rotatable member is present and therefore the usual trip device could not be employed. As a result, switching oralarm-control devices having a plurality of settable members were resorted to, and this as a consequence involved a more complicated and less convenient and accurate' procedure in setting the alarm.

The present invention overcomes the difficulties and disadvantages of the prior cyclometer alarm quired to set the alarm to the desired time.

In the speciilc structure disclosed and illustrated herein this result is accomplished by the provision of rotatable and stationary sets of circularly disposed differentially spaced cooperable members in the form of contacts, the latter set while normally stationary being rotatable to different positions. 'I'he arrangement and control of the contacts is such that only certain preselected contacts of the sets are in engagement with each other when the intermittently movable members of the clock reach the at-rest positions wherein they indicate the partlcular time for which the manually settable member is positioned. In the structure shown the settable member is a pointer and knob, which is rotatable and cooperable with a simple 360 scale having hour and minute indicia thereon covering a twelve-hour period, the knob adjustment being accomplished with but a single and continuous movement.

In the present switching or control mechanism the adjusted rotative position of the stationary set of contacts is the sole determiner of the particular time at which the control mechanism may be actuated by the clock, and this arrangement thus makes it possible to associate the simple pointer in conjunction with the 360 graduated scale with the stationary set of contacts to indicate the setting of the mechanism.

In accomplishing this simplied control, the contacts of the one set are all equally spaced .around a circle, whereas the contacts of the other set are grouped, along the circle and have individual spacings that are somewhat less than the spacing of the ilrst set. Each contact of one set is juxtaposable and cooperable for engagement and disengagement individually with each contact of the other set, and to effect such engagement and disengagement the one set of contacts is` axially shifable toward and away from the other set. Thus the sets of cooperable contacts have a relationship much like that between the sets of graduations of a vernier device, in that contacts of but one pair are juxtaposed for engagement with each other at any one time-the time for which the control mechanism is set. To cause such juxtaposed contacts to engage each other in the desired hour interval, and to prevent such engagement during all other hourly intervals means are provided responsive to positioning of the hour wheel of the clock for automatically bringing one set of contacts collectively into cooperable engaglng position with respect to the other set of contacts when the desired hour arrives.

In the illustrated embodiment of the invention.

during the hour in which the alarm is to be given,

I the contacts of one set engage each other movention delay-action means whichprevents the closing of the circuit to the alarm device until the contacts have engaged for a longer time (as when at rest) than the brief interval when one contact wipes past the other.

Another object of the present invention is to provide an improved alarm or switching mechanlsm of the above type which is extremely simple is construction and economical to manufacture.

A feature of the invention is the provision of a switching mechanism as characterized above in which but very little drag ls imposed on the cyclometer device when the mechanism is set for operation, and wherein no drag whatsoever is imposed on the device when the mechanism is not set for use.

Other features and advantages will hereinafter mechanism positioned for engagement.

Fig. 3 is a fragmentary vertical section of the switching mechanism showing the cooperable contact-carrying parts rendered inoperative by a shut-olf device.

Fig. 4 is an elevation of the clock casing showing the manually operable member for setting the switching mechanism, and showing the scal for cooperation with said member.

Fig. 5 is a vertical transverse section taken on the line 5 5 of Fig. 2.

Fig. 6 is a vertical transverse section taken on the line 6 6 of Fig. 2.

Fig. '7 is a. diagrammatic representation of the cooperable, contact-carrying parts `of the switching mechanism and of the connector means therefor, and also a representation of the hour and tens-of-minutes wheels of the clock, and of the automatic axial-shifting device for the stationary set of contacts and the scale for the manually settable member.

Fig. 8 is a schematic diagram of an alarm circuit in which the switching mechanism is included. l

Fig. 9 is a schematic diagram of a modied lcircuit including the switching mechanism, and

cludes a seconds wheel Il which is continually rotating and is driven by a synchronous electric clock motor l5. .The seconds wheel upon completing each revolution advances the units wheel Il a tenth of a revolution and the latter upon completing each revolution advances the tens wheel l2 one twelfth of a. revolution. there being successive rows from 04 to 5 on the tens wheel, and the latter upon completion of each one-half revolution advancing the hour wheel Il onetwelfth of a revolution.

- Time is read by observing the line` of numerals appearing through vthe window or sight-opening, Illa. l

The illustratedcarry-over or driving mechanism between the wheels of the clock forms no part of the present inventionand is described in detail in the copending application of Lucian Wuischpard, Serial No. 702,983, filed October 12, 1946; it will be understood that any suitable wellknown type of intermittent drive or carry-over mechanism may be employed to advance the respective wheels of the clock in their proper sequence and hence no further description oi the carry-over is given herein.

According to the present invention a simplified, novel and improved switching mechanism is provided within the casing I0 in conjunction with the numeral wheels whereby an alarm may be actuated or other circuity controlled at any of a largenumber of preselected times, the mechanism having but a single manually settable indicator member and cooperabie scale, arranged so that by a simple continuous movement the setting of the mechanism may be conveniently and quickly accomplished. In the specirlc embodiment of the invention shown, referring to Figs. 1, 2, 3 and 6, this mechanism includes a set of contacts I6 divided into two groups of contacts Il, lla which are duplicates of each other, and which are carried by a metal conducting plate IB, the latter being mounted on an insulating disk I9 supported by and pin-connected to a hollow shaft or sleeve 20 rotatably mounted on a main spindle 2| common to all the clock wheels, and passing freely through the hub of the hour wheel Il and into the hub of the tens wheel I2 where it is keyed to the latter wheel for rotation therewith. A pin 22 driven through a hole in the main spindle 2| slidably engages the disk I9 so as to maintain the numeral wheels, sleeve 20 and disk I9 assembled on the spindle 2l against excessive lateral movement, the spindge itself being held against lateral or axial movement by a drive gear 24a xed to the end of the spindle and engaging a bracket 2lb forming a bearing for one end of the spindle.

As shown in Fig. 6, there are six contacts I1, and six contacts Ila, disposed in a circle having a common center with the shaft 20, and preferably the contacts are formed by lan'clng tongues from the metal plate I8, which latter is then made from a thin sheet of spring material such as phosphor bronze.

For cooperation with the set of contacts I8, which for convenience is termed the rotating set since it rotates intermittently during operation of the clock, there is provided a second set of contacts 24, Figs. l, 2 and 3, which is termed a, stationary set of contacts since they operate while at a standstill even though they are rotatable for of the clock frame. The supporting sleeve 29 slid- V ably receives the adjacent-end of the clock spindie 2i and forms a journal therefor.

The stationary set of contacts 24 is cooperable ment of the supporting sleeve 25. the latterhas a retainer ring 32 engageable with the inner end of the bearing collar III. The stationary set of contacts 24 is yieldably urged to a cooperable engaging position with the rotating set of contacts II by means of an epansion spring-engaging the wheel and one endv of the bearingccllar n, said engaging position being shown in Fig. 2.

Referring to Fig. 7 the supporting wheel 25 which carries vthe contacts 24` is diagrannnaftically designated by a circular band, and thecontacts I1 and I1a respectively are diagrammatically shown as projecting radially fromvthe plate Il Vfor clarity of illustration although in the actual structure they do not so project. The arrangement of the sets of contacts I6 and 24 is such that when the latter set is in the rotative position of Fig. 'I each contact thereof can individually engage one contact I1 of the rotating set without engagement simultaneously occurring between any other contact I1 and any other contact 24, and the same is true of thecontacts Ila with respect to the contacts 24. The reason for this is that the contacts '24 are uniformly spaced about'the periphery of the supporting wheel 25 so that between each adjacent pair of contacts, an included central angle lof 3o is formed, while between each `adjacent pair of contacts I1 of IIa within the individual groups an included central `angle of less than is formed. Referring to Fig. 7 it will be seen that a much greater space exists between the end contacts I1 and I1a of the groups than exists between the pairs of adjacent contacts within the groups, and also that the contacts of the groups are symmetrically disposed with respect to a common diametric line X-X, Fig. 6, which is a bisector of said groups.

Thus the arrangement of the `contacts I1 and Ila is such that each contact I1 may be paired with a different contact I'Ia whereby the contacts of the pairs are diametrically opposite each other. In addition to the above arrangement of the contacts I1, I1a and 24, the widths of the contacts are made relatively small so that each covers a relatively small arc, and this precludes overlapping of any one contact of one set simultaneously with an adjacent pair of contacts of the other set.

It will be seen from an inspection of Fig'. 7 that for any one position of the tens-of-minutes wheel. and position of the wheel 25 but a single one of the contacts 24 is juxtaposed for engagement with but a single one of the contacts I1, and that no other contact 24 engages any of the other contactsl I1. Likewise for the same conditions but a single contact 24 engages one of the contacts Ila and no other contact 24 engages any of the other contacts I1a, this being due tothe diii'erential spacing of the contacts of'the sets I5 and 24. This spacing is in the nature of a Vernier wherein the graduations of one scale are spaced closer together than the graduations of the other scale so that at any one time but a sincontacts 24, a total of seventy-two'diiierent tbeoretical combinations or relative positions of the sets is possible wherein one contact 24 is juxtaposed for engagement with a contact I1, neglecting the connection of the contacts I1 and plate I8 vwith the tens-of-minutes wheel I2. words, one contact 24 may individually be juxta- 1 posed for engagement with eachof the six contacts I1, and therefore for each contact 24 there are six possible contacting-conditions. Since the contacts 24 are twelve in Vnumber this makes seventy-two possible combinations or relative positions-between the sets of contacts -24 and either lof the 'groups ofcontacts'il or I1a.

I I1a will always be aligned for respective engagement with a pair of oppositecontacts 24 during a period of rest of the tens wheel I2, provided that the stationary set of contacts 24 is first properly rotatably set for registration. A total of seventy-two-diiferent rotative settings of the set f stationary contacts l24 vis possible without duplicating engagement between the different opposite pairs 'of contacts of the sets I6 and 24, and these settings are therefore indicated by seventy-two graduations 34 making up a 360 scale 35 on the casing Il, as shown in Figs. 4 and 7. The scale 35 is divided into twelve'equal divisions numbered from 1 through l2, representing the hours, and each division is in turn di- 'NIA gie pair of graduations of the scales can be aligned.

Since there are twelve stationary contacts 24 and aix contacts I1 spaced dinerently from the vided into six subdivisions so that each `subdivision represents ten minutes. As shown in Fig. 4 'the scale 35 on the exterior of the casing ID is cooperable with a knob 36 and pointer 31 carrled by the supporting sleeve 25 exteriorly of the casing. the sleeve extending through an aperture in the casing for this purpose.

Due to the contacts I1a being a duplicate of the contacts I1, this being done because the indicia of the tens wheel I2 are duplicated once on the faces of the wheel, the fact that a second set of seventy-two combinations of relative positions of the sets is possible and existent does not alter the dividing of the scale 25 into the basic seventy-two divisions, grouped in sixes covering one hour for each group.

Referring to Figs. 1 and 5 the supporting wheel 25 has an annular flange 35 the exterior periphery of which has seventy-two equi-spaced axially extending V-groo'ves 35, and. detent springs 4I mounted on a bracket 4I are cooperable with the grooved periphery of the flange 3l so as to yieldably hold the wheel 25 in any of seventy-two different rotative positions wherein the pointer 31 is in alignment with one of the graduations I4 of the scale 35.

In an alarm mechanism it is desirable that the alarm be sounded at a certain time in a given hour interval and at no other time, and therefore means are provided for rendering the alarm inoperative during the remaining eleven hourintervals.

According to the invention this means is automatically controlled by the hour wheel Il` and operates to hold the stationary set of contacts 24 in its non-cooperating position shown in Fig. 1, wherein no engagement is possible between the setsof contacts Il and 24. This means com- In other ansa-ias prises a pin 42 rigidly carried by the supporting wheel and projecting toward the hour wheel II, the said pin functioning as a cam follower and being held by the exp-ansion spring 33 vcontinually in engagement with a cam plate 43 carried by the hour wheel. lThe cam plate 43 has an arcuate recess 44 in its surface to accommodate the tip portion of the follower pin 42, the said recess being of uniform or full depth for a distance vequal to an arc of and having a sloping bottom portion 45, at one end of the arc, see Figs. Gand 7, on which the follower pin 42 may ride up. The arrangement of the cam plate 43 and follower pin 42 is such that during one hour-interval in each consecutive twelve hours the set oi contacts 24 is allowed to remainV in cooperable engaging position with respect to the set of contacts I6 as shown in Fig. 2, and immediately following this hour-interval, the follower pin 42 will be made to ride up on the camming surface 45 of the recess 44 and during the next eleven hour-intervals the stationary set of conta-cts 24 will be maintained in the position of Fig. 1 out of cooperable relationship with the set of contacts lli.`

Thus, depending on the rotative setting of the supporting wheel 25, in any twelve-hour interval the contacts 24 thereof may cooperate andengage the contacts I1, I1a of the set of contacts I6 solely during a single predetermined hourperiod. For example, in Fig. 4 the pointer 31 is in alignment with the particular graduation 34 indicating a time of 1:30 oclock. For this setting of the set of contacts 24 they will assume the operative position of Fig. 2 for a period of one hour, this occurring only when the hour wheel II is so positioned that the numeral 1 thereof shows through the window Illa of the casing I0. For all other positions of the hour wheel II the set of contacts 24 will be maintained in the inoperative position shown in Fig. 1. l

Referring to Fig. 7 the window IDa of the casing l0 is indicated in dotted outline in the right portion of the gure, and it will be seen that the nurreral 1 of the hour wheel II (indicated by the circular band having numbers from l through l2) is in alignment with `the window IIIa. For this position of the heur wheel I I, and for the 1:30 oclock setting of the set of contacts 24 the relative positions of thecam recess 44 and cam follower 42 will be shown in Fig. 7. Also, when the number 3 of the tens wheel I2 is showing through the window Ilia of the casing, as indicated in Fig. 1 by the contact I8 which is shown as having two sets of numbers from 0" through 5" so that it may represent the tens wheel, one of the contacts I1 of the rotating set will engage one of the contacts 24 of the stationary set. Also a contact I'Ia diametrically opposite the en. gaged contact I1 will engage a contact 24 of the stationary set diametrically opposite the engaged contact 24. Advantage is taken of this condition to close a control or alarm circuit, this being acromplished by providing a pair of

contact shoes

46, 46a respectively at the top and bottom of the casing I0, these shoes being adapted to engage the diametricallyppposite contacts 24 which are being engaged by the pair oi' contacts of the rotating set. Referring to Fig. 8 the contact shoes 46 and 46a may be connected with a current supply 41` by

wires

48 and 49 respectively, the latter having included in its circuit the coil of a relay 50. The contacts 5I of the relay 50 are connected one by a wire 48a with the wire 43 and the other by a Wire 5Ia with a buzzer 52 which is in turn connected by awire 53 with the wire 49. Thus. when the contact shoes 4B and 46a are spanned so as to close the circuit through the relay 50 the latter will operate to energize the buzzer 52 and sound the alarm. The arcuate length of each of the contact shoes 46, 45a. is such that they will still be engaged by the pair of opposite contacts 24 as shown in Fig. 7 it the stationary contact set is placed in any of the six rotative positions indicated by the graduations from 1:10 oclock to 2 oclock inclusive; for these six rotative positions the cam follower pin 45 will occupy andk extend deeply into the cam recess 44 with the. hour wheel oclock through the casing window Ina. This will b'e clearly evident from an inspection 0f Fig. 7 wherein, if the supporting wheel 25 be shifted 15 clockwise so that the pointer 31 rests on 2 o'clock, the same opposite contacts 24 will still be positioned for engagement with the contact shoes 46 and 46a, and if the supporting disk 25 be shifted 10 counterclockwise so that the pointer 31 traverses the two ten-minute graduations to the 1:10 o'clock setting, the contacts will continue in engagement with the

shoes

45 and 46a.

Thus it will .be seen that for any setting of the pointer 31 from 1:10 oclock to `2 oclock, but a single pair of diametrically opposite contacts 24 of the stationary set will be positioned for engagement with theopposite contact shoes 45, 45a, and such engagement will take place only when the hour wheel II is indicating 1 through the casing window Illa. Also, upon inspection of Fig. 7 it will be seen that when the pointer 31 is placed on thegraduation indicating 1:30 oclock a pair of diametrically opposite contacts I1, Ila of the rotating set I5 will only engage those contacts 24 of the stationary set which are in engagement with the contact shoes 46, 45a `for an appreciable length of time when the tens wheel I2 is showing the numeral 3 through the window Illa. For all other at-rest positions of the tens wheel I2 engagement of the contacts I1, I1a will occur with contacts 24 which are not being engaged by the contact shoes 45. The same is true for the other five positions of the stationary set of contacts 24 in the rst hour interval, except that for' each different setting the corresponding numeral of the tens wheel I2 must show through the window Illa of the casing before engagement for any appreciable time occurs between the con tacts of the rotating set `Ili and the particular pair of diametrically opposite contacts 24 which are in engagement with the contact shoes 46, 45a.

The same conditions for engagement of contacts of the sets I6 and 24 are true for settings of the pointer 31 in other hour lintervals. except that other pairs of contacts 24 are involved in the engagement. In each instance, however, the carrier wheel 25 is maintained in the non-cooperable position shown in Fig. 1 during the eleven hourly intervals which are not designated by the pointer 31, and therefore an alarm may be given only in that interval in which the pointer 31 is resting. this being of course effected by the arrangement of the cam plate 43 and`caxn follower 42 as explained above. y

It will be noted that during movement of the tens wheel I2 from one position to the next position, momentary incidental contact may be made between that pair of diametrically opposite contacts 24 which are in engagement with the contact shoes 46, 45a and pairs of diametrically op- I| indicating lI ".S. 9 y posite contacts I1, I'Ia, except those contacts l1, I'Ia intended to actuate the alarm. However. such incidental contact is of extremely short duration, whereas the period of engagement of the intended pair of contacts I1. I1a is of a tenminute duration, and to prevent the buzzer 52 from sounding the alarm during such incidental contact the relay 50 is made to have a time delay, the time lag being such that the buzzer is not sounded for any fleeting energization of the relay.

When it is desired to shut oi! the alarm mechanism this is accomplished by pulling the knob 36 outwardly to the position shown in Fig. 3, whereupon a pivotal latch lever 54 provided for the purpose of shut-oil swings under the action of a spring 54a so'thata recessed portion 55 thereof engages an annular groove 55 in the supporting sleeve 29 and retains the latter and contactcarrying wheel 25 in the inoperative position. For the position of Fig. 3, obviously the cam follower 42 is prevented from engagement with thel cam plate 43 and therefore the stationary set of contacts 241s at .all times prevented from engaging the rotating set of contacts I8. Y

When it is desired to again render the alarm effective, this is done by manually shifting downward a ilngerpiece 54h extending through a slot i017 in the casing, Fig. 4, this raising the recessed portion 55 of the latching lever and releasing the sleeve 29 whereupon the coil spring 33 automatically axially shifts the sleeve and wheel 25 to the Y,

the line or supply 41. and as a consequence a periodic or repeated alarm is given when the desired time is reached.

Variations and modifications may be made within the scope of this invention and portions of the improvements may be used without others.

. I claim:

l. In a cyclometer having a pair of related, relatively movable counters, selector means including a member having graduations corresponding respectively to various predetermined relative positions of the counters, said means including elements settable to sense any desired set of counter positions; and means including cooperating elements positioned by said counters for switching an electrical circuit when the counters come to the particular set of positions determined by the setting of said selector means.

2. In a cyclometer having a pair of related relatively movable counters, selector means including solely one movable manually operable member and including a cooperable `fixed member, one of said members having graduations corresponding respectively'to the various predetermined 'relative positions of the counters, said pointer and dial, said dial having graduations for p each hour and each tens-of-minutes in each hour; and means under the Joint control of said selector and said houx` member and tens-ofminutes member for switching a circuit when said members are respectively at the hour and l tens-of-minutes for which the selector is set.

other as shown. `By this organization a time delay is provided which prevents operation of the buzzer 52 during incidental bridging of the contact shoes 48, 45a and associated pair of diametrically opposite contacts 26, since 4a certain amount of time is required for the bimetallic arm to be heated after closing of the circuit through the

shoes

46, 46a. i Another alternative form of control circuit is shown in Fig. 10. In this circuit the supply 41 is connected by wire 48 to contact shoe 45, and by a wire 59 to the buzzer 52 the. other terminal of which connects through a wire 60 with contacts 5ib controlled by bimetallic arm 58. Arm 58 is connected by wire 48a to wire 48, and heater 51 is connected by wire 49 to shoe 45a, and by wire 6| to wire 60.

` @The resistance of the buzzer 52 is so great that -the current passing through it and the seriesconnected heater 51 is insuillcient to heat the latter to actuate the bimetallic arm, and therefore closing of the contacts 5Ib must be depended on to heat the heater 51 and arm 58. In the circuit of Fig. 9 heat causes the arm 58 to close the con-v tacts 5Ifb; however, in the circuit lof Fig. l0 heat causes the arm 58 to open the contacts 5Ib, and such opening places the buzzer in series with the heater and the latter therefore cools off. This action again enables the arm 5B to close the contacts, so that a periodic opening and closing of the contacts occurs. 'The resistance of the heater 51 is sufilcient to render inoperative the buzzer 52 when both of these are seriesV connected across 4. In an alarm clock having rotatable number` bearing hour and tens-of-minutes members, means, including a member graduated in hours and tens-of-minutes, settable to indicate the time when the alarm willvbe given; and means for switching on electrical alarm circuit when the houi member and tens-'of-minutes member have come to the hour and ten-minute period for which the settable means is set. 5. In an alarm clock having rotatable numberbearing hour and tens-of-minutes members,

means, including a member graduated in hours4 V and tens-of-minutes, settable to indicate the time when the alarm will be given; and means including contact-controlling members actuated' by the hour member and tens-of-minutes memmovable counters advanceable at different rates,

a control mechanism comprising a first set of members which is intermittently movable as a unit in step with one of said counters, the spac- V-ing of the members being different from the extent of advance oi' the counters whereby each member comes to rest in a different arcuate position; a second set of members which are movable as a unit, the members thereof being individually Juxtaposable and cooperable for engagement each with diil'erent individual members loi the first set; means for manually arcuately sotting the second set of members in any of a plurality of predetermined positions, said positions representing respectively a like plurality of relative positionings of the sets determined by juxtaposition of diilerent individual members of the second set each with different indiv'dual members of the first set, said juxtaposition occuring with said one counter occupying various positions of rest; and means for switching a circuit in response to engagement between a pair of juxtaposed members of the sets.

7. In a cyclometer having a pair of relatively movable counters advanceable at different rates, a control mechanism comprising a first set of members which is intermittently movable as a unit in step with one of said counters, the spacing of the members being different from the extent of` advance of the counters whereby each member comes to rest in a different arcuate position; a second set of members which are movable as a unit, the members thereof being individually juxtaposable and cooperable for engagement each with different individual members of the first set; means for manually arcuately setting the second set of members in any of a plurality of predetermined positions, said postions representing respectively a like plurality of relative positionings of the sets determined by juxtaposition of different individual members of the second set each-Wth different individual members of the first set, said juxtaposition occurring with said one counter occupying various positions of rest; means for switching a circuit'in response to engagement between a pair of juxtaposed members of the set; and means controlled by said settingy means and said other counter and automatcally operab`e in an interval of rest of the latter for causingr engagement between a pair of juxtaposed members of the sets in an interval of rest of said one counter.

8. In a cyclometer having a pair of relatively rotatable members advanceable at diil'erent rates, a control mechanism comprising a. first set of contacts which are arranged about an axis, said set of contacts intermittently rotating as a unit about said axis in step with one of said members, and the angular spacing of the contacts being diiferent from the angular advance of the member whereby each contact comes to rest in a different arcuate position; a second set of contacts which are circularly arranged about said axis, said second set of contacts being rotatable as a unit and the contacts thereof being individually juxtaposable and cooperable for engagement each with diierent individual contacts of the rst set; means for manually rotatably setting the second set of contacts in any of a plurality of predetermined rotative positions, said positions representing respectively a like plurality of relative positionings of the sets determined by juxtaposition of different individual contacts of the second set each with different individual contacts of the rst set, said juxtaposition occurring with said one member occupying variouspositions of rest; a control circuit, said circuit having means for connection with a pair f juxtaposed contacts, and said circuit being normally open; and means controlled by said setting means and said other member and automatically operable in an interval of rest of the latter for causing said circuit to be closed and continuous through said pair of contacts in an interval of rest of said one member.

9. In a. cyclometer having a pair of intermittently rotatable members advanceable at diierent rates, a control mechanism comprising a first set of contacts which are arranged consecutively about an axis, said set of contacts intermittently rotating as a unit about said axis in step with one of said members and the angular spacing of the contacts being ditlerent from the angular advance of the member; a second set of contacts which are circularly arranged about said axis, said second set of contacts being rotatable as a unit and the contacts thereof being individually juxtaposable and cooperable for engagement each with diilerent individual contacts of the first set; means for manually rotatably setting the second set of contacts in any of a plurality of predetermined rotative positions, said positions representing respectively a like plurality of relative positionings of the sets determined by juxtaposition oi' different individual contacts of the second set each with different individual contacts of the first set, said juxtaposition occurring with said one member occupying various positions of rest; a control circuit, said circuit having means including a contact shoe engageable individually with each of the contacts of the second set for making connections to a pair'of juxtaposed contacts, and said circuit being normally open; and means controlled by said other member and automatically operative in an interval of rest of the latter for causing said circuit to be closed and continuous through said pair of juxtaposed contacts in an interval of rest of said one member.

10. In a cyclometer having a pair of intermittently rotatable members advanceable at different rates, a. control mechanism comprising a first set of contacts which are arranged about an axis, said set of contacts intermittently rotating as a unit about said axis in step with one of said members, and the angular spacing of the contacts being different from the angular advance of the member; a second set of contacts which are arranged about said axis, said second set of contacts being rotatable as a unit and the contacts thereof being individually juxtaposable each with each contact of the first set; means for manually rotatably setting the second set of contacts in any of a plurality of predetermined rotative positions, said positions representing respectively a like plurality of relative positionings of the sets determined by juxtaposition of individual contacts of the second set each with each individual contact of the first set, said juxtaposition occurring with said one member occupying in turn its positions of rest; means controlled' by the other member and automatically operable in an interval of rest of the latter for causing engagement between any pair of contacts which are juxtaposed with each other in an interval of rest of said one member; and means for connecting the engaged contacts in a circuit.

11. In a cyclometer having a pair of related, intermittently movable counters, an indicating means including a member having graduations corresponding respectively to the various predetermined relative positions of the counters, said means being settable to indicate any desired set of at-rest positions; and means for switching an electrical circuit when both counters attain the particular set of predetermined at-rest positions indicated by the settable means, said switching means momentarily switching said circuit during movements of one counter when out of its said predetermined at-rest position and while `the other counter is in its said predetermined at-rest position; and a time-delay device connected with said switching means for rendering ineffective said momentary switching.

assaiss 12. In a cyclometer having a pair of intermittently rotatable members advanceable at different rates, a control mechanism comprising a rst set of contacts which are uniformly spaced from each other and are arcuately arranged about an axis, said set of contacts intermittently rotating about said axis in step with one of said members, and the angular spacing of the contacts being differentv from the angularr advance of the member; a second set of contacts which are uniformly spaced from each other and are circularly arranged about said axis, said second set of contacts being rotatable as a whole and the contacts thereof being individually alignable each with each contact of the first set; means for manually rotatably setting the second set of contacts in any of a plurality of predetermined rotative posilike plurality of relative positionings of the sets determined by individual alignment of each contact of the second set with each contact of thel first set with said one member occupying in turn all of its positions of rest; means controlled by the other member and automatically operable. during an interval of rest of the latter for causing ensagement between any pair of contacts which are aligned in an interval of rest of said one member; and means for connecting `the engaged contacts in a circuit.

13. In a cyclometer having a pair of intermittently rotatable members advanceable at different rates, and havinga casing enclosing said members, a controlmechanism carried in the casing comprising a first set of contacts which are arranged aboutan axis, said set of contacts intermittently rotating as a unit about said axis in step with one of said members, and the angular spacing of the contacts being different from the angular advance of the member; a second set of contacts which are circularly arranged about said axis, said second set of contacts being rotatable as a unit and the contacts thereof being individually juxtaposable and cooperable for engagement 'each with diierent individual contacts of the first set; means `including but a single, manually operable member located exteriorly of the casing for rotatably setting the second set of contacts in any of a plurality of predetermined rotative positions, said positions representing respectively a like plurality of relative positionings of the sets determined by juxtaposition of different individual contacts of the second set each with different individual contacts of the ilrst set, said juxtaposition occurring with the said 'one member occupying various positions of rest; a control circuit in the-casing, said circuit having means'for connection with a pair of juxtaposed contacts, and said circuit being normally open; means controlled by said other member and automatically operable in an interval of rest of the latter for causing said circuit to be closed and continuous through said pair of con-- tacts in an interval of rest of said one member; and a scale carried by the casing adjacent said manually operable member for cooperation therewith, said scale having divisionscorresponding to the intervals of rest of said other member, and

having subdivisions corresponding to the intervals of rest of said one member.

14. In a cyclometer having a pair of indiciacarrying intermittently rotatable members advanceable at different rates and having positions of rest corresponding in number respectively toy thenumber of indicia carried, a con- 14 trol mechanism comprising a iirst set of contacts which are arranged about an axis, said set of contacts intermittently rotating as a unit about said axis in step with one of said members and being equal in number to the number of indicia of the member. the angular spacing of the contacts being dinerent from the angular spacing tions, said positions representing respectively a of said indicia; a` second set of contacts which are circularly arranged and equi-spaced about said axis and are equal in number to the number of indicia of the other member said second set of contacts being rotatable as a unit and the contacts thereof being individually juxtaposable and cooperable for engagement each with different individual contacts of the first set; means for manually rotatably setting the second set of contacts in any of a plurality of predetermined rotative positions, said positiops representing respectively a like plurality of relative positionings of the sets determined by juxtaposition of each different individual contact of the second set with each different individual contact of the ilrst set,

Asaid juxtaposition occurring with the said one member occupying in turn all of its positions of l rest; apontrol circuit, said circuit having means for connection with a pair of juxtaposed contacts, and said circuit being normally open; and

means controlled by said other member and automatically operable inan interval of rest of the latter for causing said circuit to be closed and continuous through said pair of contacts in an interval of rest of said one member.

15. In a cyclometer having a pair .of intermittently rotatable members advanceable at dinerent rates, a control mechanism comprising a ilrst set of contacts which are arranged about an axis, said set of contacts intermittently rotating as a unit about said axis in step with one of said members, and the angular spacing of the contacts being different 'from the angular advance of the member; a second set of contacts which are arranged about said axis, said second set of contacts being rotatable and axially movable as a unit and the contacts thereof being individualy juxtaposable each with each contact of the first set; means for manually rotatably setting the second set of contacts in any of a. plurality of predetermined rotative positions, said positions representing respectively a like plurality of relative positionings of the sets determined by juxtaposition of individual contacts of the second set each with each individual contact of the ilrst set,`

said juxtaposition occurring with said one member occupying in turn its positions of rest; means controlled by the other member and automatically operable in an interval of rest of the latter for axially shifting the second set of contacts and causing engagement betweenany pair of contacts which are juxtaposed with each other in an interval of rest of said one member, said means including a cam and follower associated with the second set of contacts; and means for connecting the engaged contacts in a circuit.

16. In a cyclometer having a pair of intermittently rotatable members advanceable at diHer ent rates, a control mechanism comprising a ilrst set of twelve contacts disposed about an axis and intermittently rotating as a unit in step with one of said members; a second set of twelve contacts cooperable with the first set, the contacts of the second set being rotatable as a unit and individually Juxtaposable and cooperable for engagement each with each contact of the ilrst set: means for manually rotatably setting the second setof contacts in any of seventy-two different rotative positions about the said axis. both said sets of contacts `being so arranged that for each different setting of the second set the contacts of two predetermined different oppositely loc'ated pairs of contacts of the first and second sets are juxtaposed for respective engagement with `each other. said juxtapositioning occuring solely during periods of rest of said one member; a control circuit, said circuit having means for connection with the juxtaposed contacts, and said circuit being normally open; and'means controlled by the other member and automatically operable in an interval of rest of the latter for causing said circuit to be closed and continuous through the juxtaposed contacts in an interval of rest of said one member.

17. In a cyclometer clock having an hour wheel and an intermittently rotatablel tens-of-minutes wheel, a control mechanism comprising a set of six contacts which are arranged about an axis, said set of contacts intermittently rotating as a unit about said axis in step with the tens-ofminutes wheel, and the angular spacing of the contacts being different from the angular advance of the wheel; a set oi twelve contacts which are circularly arranged about said axis, said twelve contacts being rotatable as a unit and being individually juxtaposableI and cooperable for engagement each with different individual contacts of the set of six; means for manually rotatably setting the set of twelve contacts in any of seventy-two predetermined rotative positions, said positions corresponding respectively to seventy-two relative positionings of the sets determined by juxtaposition of each contact of the set of six with each contact of the set of twelve, said juxtaposition occurring with the tens-ofminutes wheel occupying various positions of rest; a control circuit, said circuit having means for connection with a pair of juxtaposed contacts, and said circuit being normally open; and means controlled by the hour wheel and automatically operable in an interval of rest of the latter for causing said circuit to be closed and continuous through said pair of contacts in an interval of rest of said tens-of-minutes wheel.

18. In a cyclometer clock having an hour wheel and an intermittently movable tens-of-minutes wheel having twelve at-rest positions, a control mechanism comprising a iirst set'of twelve contacts generally circularly disposed about an axis and arranged in two groups of six consecutive contacts each, said contacts being symmetrical about a common diameter bisecting the groups, the contacts in the groups being uniformly spaced apart by equal arcs different from 30, and said set of contacts intermittently rotating about its axis as a unit in step with the tens-of-minutes wheel; a second set of twelve contacts cooperable with the rst set, the contacts of the second set being uniformly spaced from each other and circularly arranged about said axis and being rotatable as a unit and individually juxtaposablc and cooperable for engagement each with each contact of the first set; means for manually rotatably setting the second set of contacts in any of seventy-two different, uniformly spaced rotative pcsitions about the said axis, both said sets of contacts being so arranged that for each different setting of the second set the contacts of two predetermined different oppositely located pairs of contacts of the rst and second sets are juxtaposed for respective engagement with each other, said Juxtapositioning occurring solely during periods of rest of the tens-of-minutes wheel; a control circuit, said circuit having means for connection with the juxtaposed contacts, and said circuit being normally open; and means controlled by the hour wheel and automatically operable in an interval of rest of the latter for causing said circuit to be closed and continuous through the juxtaposed contacts in an interval of rest of the tens-of-minutes wheel.

19. In a cyclometer clock having an hour wheel and an intermittently movable tens-of-minutes wheel having twelve at-rest positions, an alarm mechanism comprising a first set of twelve relatively flxed contacts disposed in a circle about an axis and arranged in two groups of six consecutive contacts each, said contacts being symmetrical about a common diameter bisecting the groups, the contacts in the groups being unlformly spaced apart by equal arcs of less than thirty degrees, and said set of contacts intermittently rotating about its axis in step with the tens-of-minutes wheel; a second set of twelve i relatively fixed contacts cooperable with the first set, the contacts of the second set being uni- I ormlyspaced from each other and circularly arranged about said axis and being rotatable as a whole and individually alignable in an axial direction each with each contact of the rst set; means for manually rotatably setting the second set of contacts in any of seventy-two different. uniformly spaced rotative positions about the said axis, both said sets oi contacts being so arranged that for each diierent setting of the second set the contacts of two predetermined, different. oppositely located pairs of contacts of the first and second sets are positioned for respective engagement with each other, said positioning occurring solely during periods of rest of the tens-of-rninutes wheel, and said sets of contacts being relatively axially movable as a whole between a position wherein the contacts of said pairs are engageable with each other during said periods of rest, and a position wherein no contacts are engageable with each other; means controlled by the hour wheel for automatically relatively axially shifting the sets of contacts to engageable position and maintaining said position for an interval of between 50 and 60 minutes duration once during each twelve-hour interval; and means for connecting engaged pairs of contacts of the sets in an alarm circuit for operating the alarm.

20. A cyclometer type clock having number wheels independently settable to the correct time reading, an alarm mechanism including a single settable member for predetermining in hours and fractions thereof the time when the alarm is to be given, and separate means for each of a pluv rality of said number wheels separately settable and movable therewith and cooperating with said single settable member for causing an alarm to be given at a time predetermined for the setting of said member.

2l. A cyclometer type clock having number wheels independently settable to the correct time reading; a plurality of independent alarm controlling means each connected to one of said number wheels and movable and settable therewith; and an alarm-time selector comprising a single member settable to a position for predeterminng the time at which the alarm is given, said single member cooperating with said independent alarm controlling means for giving the alarm at said predetermined time.

22. A cyclometer type clock having number 17 f wheels independently settable to the correct tim reading; a plurality oiindependent alarm ccntrolling means each connected to one of said number wheels' and movable and settable therewith; an alarm-timeselector comprising asingle member settable to a position for predetermining the time at which the alarm is given, said single member cooperating with said independent alarm controlling means for giving the alarm at said predetermined time and a dial and pointer one oi which is movable to set the member.

23. A cyclometer typel cloclr having number wheels independently settable to the correct time reading; a plurality of independent alarm controlling means each connected to one of said number wheels and movable and settable therey with, said means includingelectric contacts; and an alarm-time selector comprising a single member carrying electric contacts and settable to a position to be engaged by a contact on said means when said number wheels and their means come to rest at a predetermined alarm-time.

24. A cyclometer type clock having number wheel independently settable to the correct time reading; a plurality of independent alarm controlling means each connected to one of said number wheels and movable and settable therewith, said means including electric contacts; an alarm-time selector comprising a single member carrying electric contacts and settable to a position to be engaged by a contact on said means when said number wheels and their means come to rest at a predetermined alarm-time, said contacts engaging momentarily during movement of the numberwheels, and means for preventing the giving of an alarmA during such momentary engagement. y

18 means for connection with a pair of'juxtaposed contacts, and said circuit being normally open; means controlled by said other member and automatically operable in an interval of rest ofv the latter for causing said circuit to be closed and continuous through said pair of contacts in an interval of rest of said one member; and a time-delay device associated with the control circuit, for rendering ineffective momentary closing of the latter. .Y

27. A cyclometer type clock having number wheels independently settable to the correct time reading; a plurality of independent alarm controlling means each connected to one of said number wheels and rotatable and settable there-- with, said means including electric contacts; an

. alarm-time selector comprising a single member carrying electric contacts and rotatably settable to a position to be engaged by a contact on said means when said number wheels and their means come to rest at a predetermined alarm-time. said single member being axially movable between a ilrst operative position,` wherein engagement of said contacts can occur, to a second position wherein said contacts are separatedand-not engageable; and manually operable detent means for releasably holding the memberin said second position.

28. In a cyclometer having a pair of relatively movable counters advanceable at diierent rates, a control mechanism comprising a first set of members which is intermittently movable as a 25. A cyclometer type clock havingv number I wheels independently settableto the correct time reading; a plurality` of independent alarm' controlling means each connected to one of said number wheels `and movable andA settable vtherewith; an alarm-time selector comprising a single `member settable to a position for predetermining the time at which the alarm is given, said single member cooperating with said independent alarm controlling means forgiving the alarm` at said predetermined time; andmeans for manually moving said single member to'a position ont of cooperation with said means `when the `alarm is tobe shut-off or notv given.

26. In a cyclometer having Pair of intermittently rotatable members advanceable at different rates, a control mechanism comprising a ilrst set of contacts which are arranged about an axis, said set of contacts intermittently rotating asa unit about said axis in step with one of said members, and the angularsp'acing of the contbcts being diierent from the angular advance of the member; a second setof contacts which are circularly arranged about said axis, said second set. of contacts beingV rotatable as a unit and the contacts thereof being individually juxtaposable and cooperable vfor engagement each with diilerent individual contacts of. the first set; means for manually rotatably setting the second set of contacts in any of a plurality of predetermined rotative positions, said positions corresponding Yrespectively to a like plurality 'of relative positionings of the sets determined by `juxtaposition ofY diierent individual contacts f-of the second set each with different individual contacts of the first set, said juxtaposition occurring .with said one member occupying various positions o! rest; a control circuihsaid circuit having unit in a step with one of said counters, the spacing of the members being Adiierent from the extent of advance of the counters whereby each member comes vto rest in a different arcuate position; a second setl of members which are movable as a unit, the members thereof being individually juxtaposable and cooperable for engagement each with different individual members of the ilrst set; means including a manually operable part for arcuately setting the second se't of members in any of a plurality of predetermined positions, said positions representing respectively alike plurality of relative positionings of the sets determined by juxtaposition of diierent individual members of thesecon'd-'set eachv` with differV ent individual members of the rst set, said luxtaposition occurring with said `one counter occupying various positions of rest, saidsecond set of members being axially movable between two positions one of which enablesijuxtap'osed members of the sets-to'be engaged and the other of which maintains' juxtaposed members separated;

means for switching a circuit inresponse to engagement between a pair of juxtaposed members of the sets; and means for maintaining said second set of members in either of said two axial positions. l'

, v29. `In a cyclometerv having a pair of intermittently rotatablemembers advanceable at different rates, a control mechanism'comprising a rst set of contacts which are arranged about an axis, said set of contacts intermittently rotating as a unit about said axis in step with one of said members, and the angular spacing offthe contacts being different from the angular advance of the member; a second set of contacts which are circularly arranged about said axis, said second set of contacts being movable toeither of two axiallyspaced positions, rotatable as a unit whereby for individual contacts of the rst set, and for the other axial position the contactsv of the sets are maintained separated; means for manually rotatably setting the second set of contacts in any of a plurality of predetermined rotative positions, said positions corresponding respectively to a like plurality of relative positionings of the sets determined by juxtaposition of different individual contacts of the second set each with different individual contacts of the rst set, said juxtaposition occurring with said one member occupying various positions of rest; a normally open control circuit, said circiut having means for connection with a pair of juxtaposed contacts, and said circuit being closed when juxtaposed contacts engage each other; means controlled by said other member and automatically operable in an interval of rest of the latter for axially shifting said second set of contacts to cause engagement of juxtaposed contacts in an interval -of rest of said one member; and manually releasable means for holding said second set of contacts in said other axial position wherein the contacts of the sets are separated, thereby to prevent closing of the control circuit.

30. In a cyclometer clock having an hour wheel and an intermittently rotatable tens-of-minutes wheel, a control mechanism comprising a set of six contacts which are arcuately arranged about an axis and are uniformly angularly spaced from each other, said set of contacts intermittently rotating as a unit about said axis in step with the tens-oi-minutes wheel, and the angular spacing of the contacts being different from the angular advance of the wheel; a set of twelve contacts uniformly spaced from each other and circularly arranged about said axis, said twelve contacts being rotatable as a whole and being indi-` vidually iuxtaposable each with each of said six contacts; means for manually rotatably setting the set of twelve contacts in any of seventy-two predetermined rotative positions, said positions corresponding respectively to seventy-two relative positionings of the sets determined by juxtaposition of each contact of one set in turn with each contact of the other set with the tens-ofminutes wheel occupying various positions of rest; means controlled by the hour wheel and automatically operable for an interval not greater than one hour for causing engagement between any pair of contacts which are juxtaposed with each other in an interval of rest of the tens-ofminutes wheel; and means for connecting the engaged contacts in a circuit.

31. In a cyclometer clock having an hour wheel and having an vintermittently movable tens-ofminutes wheel, a circuit control mechanism comprising a set of six contacts which are fixed with respect to, and are uniformly spaced from each other and are arcuately arranged about an axis, said set of contacts intermittently rotating about said axis in step with the tens-of-minutes wheel and the angular spacing of the contacts being less than the angular advance of said wheel; a set of twelve contacts which are iixed with respect to, and are uniformly spaced from each other, said twelve contacts being circularly arranged about said axis and rotatable as a whole, and being individually alignable each with each oi' said six contacts, said sets of contacts being relatively movable as units into and out of cooperable relationship with each other; means for manually rotatably setting the second set of contacts in any of seventy-two predetermined rotative positions, said positions corresponding respectively to seventy-two relative positionings of the sets determined by individual alignment oi each contact of the second set in turn with each contact of the first set with the tens-of-minutes wheel occupying various positions of rest, engagement of aligned contacts taking place only when the sets of contacts are in the said cooperable relationship; means controlled by the hour wheel for automatically relatively moving `the sets of contacts into said cooperable relationship andmaintaining said relationship ior a predetermined interval, of not more' than one hour, once during each twelve-hour interval and means for connecting contacts of the sets, when engaged, in a circuit.

32. In a cyclometer clock having an hour wheel and an intermittently rotatable tens-of-minutes wheel, and having a casing enclosing said wheels, an alarm control mechanism carried in the casing and comprising a set of six contacts which are arranged about an axis, said set of contacts intermittently rotating as a unit about said axis in step with the tens-of-lninutes wheel, and the angular spacing of the contacts being diilerent from the angular advance of the wheel; a set of twelve contacts which are circularly arranged about said axis, said twelve contacts being rotatable as a unit and being individually juxtaposable and cooperable i'or engagement each with different individual contacts o! the set of six; means including a single. manually yoperable member located exteriorly of the casing for rotatably setting the set of twelvel contacts in any of seventy-two predetermined rotative positions, said positions corresponding respectively to seventy-two relative positionings of the sets determined by juxtaposition of each contact of the set of six with each contact of the set'of twelve. said juxtaposition occurring with the tens-ofminutes wheel occupying various positions of rest; an alarm circuit in the casing, said circuit having means for connection with a pair of juxtaposed contacts, and said circuit being normally open; means controlled by the hour wheel and automatically operable inan interval of rest of the latter for causing said alarm circuit to be closed and continuous through said pair of contacts in an interval of rest of said tens-of-minvutes wheel; and a scale carried by the casing adjacent said manually operable member for cooperation therewith, said scale having hourly divisions and ten-minute subdivisions covering a twelve-hour period.

33. In a cyclometer clock having an hour wheel and an intermittently movable tens-oiminutes wheel having twelve at-rest positions and having a casing enclosing said wheels, an alarm mechanism carried in the casing comprising a first set of twelve relatively iixe'd contacts disposed in a circle about an axis and arranged in two groups of six consecutive contacts each, said contacts being symmetrical about a common diameter bisecting the groups, the contacts in the groups being uniformly spaced apart by equal arcs of less than 30, and said set of contacts intermittently rotating about-its axis in step with the tens-of-minutes wheel; a second set of twelve relatively iixed contacts cooperable with the iirst set, the contacts of the second set being uniformly spaced from each other and circularly arranged about said axis and being rotatable as a whole and individually alignable in an axial direction witheach contact o! the iirst set; means including but a single manually operable member located exteriorly ot the casing for rotatably seventy-two different, uniformly spaced rota.

tive positions about the said axis, both said sets of contacts being so `arranged that for each different setting of the second set the contacts of two predetermined different oppositely locatedy pairs of contacts of the lirst and second ysets are positioned for respective engagement with each other, said positioning occurring solely during periods of rest of the tens-ofminutes Wheel, and said sets of contacts being relatively axially movable as a unit between a position wherein the contacts of said pairs are engageable with each other during said periods of rest, and a position wherein no contacts vare engageable with each other; means controlled by the hour wheel for automatically relatively axially shifting the sets of contacts to engageable position and maintaining said position for a predetermined interval of approximately one hour duration once during each twelve-hour interval; means in .the casing for connecting engaged pairs of contacts of the sets in an alarm circuit tor operating the alarm; a 360 scale carried 22 by the casing adjacent said'manually operable member for cooperation therewith, said scale having hourly divisions and ten-minute subdivisions covering a twelve-hour period; and 'a detent for yieldably holding the. second set of contacts in any of said seventy-two rotative settings.

. ARTHUR A. JOHNSON.

REFERENCES CITED Thefollowing references are of record in the le of this patent:

UNITED STATES PATENTS Netherlands Feb? 15, 1923