Патент USA US2056905код для вставки
Oct. 6, 1936. A. P. NEYHART ? 2,056,905 CALENDAR CLOCK MECHANISM Filed Oct. 2, 1933 2 Sheets-Sheet 1 27 17 21 2G I. E 7/ ii 9 7 I HF51 ?2?/_ : - _., ___?\\ 1 J0 10 60 .5 %X\ � \ 493x / 2 54 59 , 22 557g 9 22!. � Aria/Ur PZV-eghut/ INVENTOR. ' \ __q BM? 63 ATTORNEY . Oct. 6, 1936. A. P. NEYHAFET CALENDAR CLOCK MECHAN I SM Filed Oct. 2, 1933 2 Sheets-Shee?i; ?9 TTORNE Y Patented Oct. 6, 1936 2,056,905 UNITED STATES PATENT OFFICE 2.056.905 CALENDAR CLOCK MECHANISM Arthur P. Ncyhart, Los Angeles, Calif., assignor of one-half to Kenneth T. Norris, Los Angeles, Calif. Application October 2, 1 933, Serial No. 691,765 16 Claims. This invention relates to and has for a general object the provision of a calendar mechanism adapted to beconnected with a clock in such a manner that the proper day of the week, day of Cl the month and month will be visibly indicated on or through the dial of the clock, in addition to the hours and minutes indicated by the clock mecha nism; and additionally contemplates the provi 10 sion of means operated by the power of the clock mechanism, whereby the day of the week and day of the month indications will be automatically changed at the close of each day of twenty-four hours, and the month indication will, likewise, be changed automatically at the end of the last day of each month, except in leap years, regardless of the number of days in a month. More speci?cally, this invention contemplates the combination with a clock mechanism and a dial for indicating the time of the day, of a set of dials or discs which will be hereinafter referred to as indicators, independently rotatable and op eratively connected with the driven spindle of the clock mechanism, and provided with means en gageable with and under the control of a regulat~ 25 ing means driven from the clock mechanism, for automatically advancing the day of the week in dicator and the day of the month indicator at the close of each day of a month, and selectively arranged for advancing the day of the month in 30 dicator one, two or four steps at the close of the last day of each calendar month, and for advanc ing the month indicator one step at the close of the last day of each month. Another object is to provide a simple and e??ec tive means for setting the indicators at proper positions in the event that the clock to which-my improvements may be attached may be stopped. Still other objects may appear as the description =10 progresses. I prefer to associate my improvements with an electrically actuated clock mechanism having a . dial for indicating the time of day and a power operated spindle to which the hour and minute hands of the clock are connected for operation. In such event I provide a gear driven actuator which is capable of rotation at but one-half the speed of the hour hand of the clock, i. e. said actuator makes but one complete revolution in each period of twenty-four hours. 50 Said actuator is preferably associated directly with the peripheries of the day of the week, day of the month?and month indicators, through the instrumentality of a detent which is under the control of the actuator and serves to prevent the rotation of all of the indicators except at the prop (Cl. 58-5) er times, and then only to proper extent, for coor dinating the calendar with the clock mechanism. The detent is preferably adjustable in order that it may be released from the actuator and also from the indicators, and manually operable means 5 is provided for regulating and effecting the re lease of said detent when it may become neces sary to set the calendar mechanism, as when the clock may have stopped. In general I have sought to provide a calendar 10 clock mechanism of maximum simplicity and durability which is capable of production at a minimum cost. Such a mechanism is illustrated in the accompanying drawings, in which: Fig. 1 is a front elevation of a clock embodying 15 my improvements; Fig. 2 is a rear elevation of the same; Fig. 3 is a front elevation of the calendar indi cating mechanism, with the face of the clock re moved; 20 Fig. 4 is a sectional plan on line 4-4 of Fig. 2; Fig. 5 is a sectional plan on line 5?5 of Fig. 3; Fig. 6 is an enlarged?fragmentary section on line 6?5 of Fig. 3; Fig. 7 is a face view of the calendar setting de 20 vice; as seen from line 1?1 of Fig. 4; Fig. 8 is a typical face view of one of a set of friction plates adapted to be fixed to ?the driving spindle of the clock and associated with and for imparting movement to the calendar indicators, 30 thus partaking of the nature of clutches; Fig. 9 is a face view of a spring washer a?ixed to the end of the clock spindle for holding the indicators and their driving plates in frictional contact; 35 Fig. 10 is a fragmentary enlarged front view of the indicators positioned in readiness for a trans fer from the 28th day of February to the? 1st day of March; Fig. 11 is a view of said indicators showing 40 their relative positions at the completion of a transfer movement from February 28th to March 1st; Fig. 12 is a similar view of the indicators pre paratory to a change from January 31st to Feb- 45 ruary 1st; Fig. 13 is a similar view of the same at the com pletion of said change; Fig. 14 is a similar view of the indicators pre paratory to a change from a month of 30 days, as 50 in April, to the first day of a succeeding month; Fig. 15 is a view of the same at the completion of the change in date suggested in Fig. 14; Fig. 16 is a fragmentary face view of the day of the week indicator; 65 2 2,056,905 Fig. 17 is a similar view of the day of the month Fig. 18 is a full face view of the month indi cator; Fig. 19 is a side view of a calendar indicator setting cam; ' Fig. 20 is a diagram showing a projection of 10 thereon, in annular arrangement and at regu larly spaced points, the abbreviations for the days indicator; of the week, in sequence, as at 28, 23 etc. There being seven days of the week, the indicator is subdivided into seven segments of uniform size 5 and outwardly of each day designation a T shaped aperture is provided in the indicator, as the setting cam for indicating different positions at 29, 29, etc. of the cam with respect to the calendar indica Radially opposite each of the apertures 29 and the day designations 28 the periphery of indi 10 tors. ' Brie?y . described, my improved calendar mechanism is adapted to be associated with a suitable clock C having a dial D and a motor driven mechanism E suitably mounted in a case 15 F. A typical clock mechanism usually includes a pair of spaced plates I and 2 which are spaced apart and secured together by means of spacers 3, 3, etc., and the dial D is held on the front of the frame thus provided, while the mechanism E 20 is suitably supported between or on said plates. In many clock mechanisms a driven spindle 4 is provided on which an hour hand 5 and a min ute hand 6 is mounted coaxially. Minute-hand 6 is ?xed ,to spindle 4 and the hour-hand 5 isop 25 erated from shaft ?I through gears 4', ?I?, 8 and 9. . cator I4 is provided with a notch 36. The bot toms of all of the notches 30 are at uniform dis tances from the axis of spindle 4, and the inter mediate arcuate portions 3|, 3|, etc., are also concentric with the axis of spindle 4 and are of a common radius. On corresponding sides of the notches 30 teeth 32 are correspondingly formed and extend out wardly for corresponding distances from the pe ripheral portions 3|; also the corresponding edges 20 of said teeth form continuations. on radial, lines, of corresponding lateral edges of the notches 30. The day of the month indicator I5, which is the innermost of the set of indicators, is pro vided with regularly spaced and annularly ar Gear 4' is ?xed to shaft 4 and gear 9 is loose on ' ranged numerals, as at 33, representing days of -shaft 4. the month, in sequence from ?1? to ?31? inclu It will be noted that I provide but two addi sive, thus subdividing this indicatorinto thirty tional gears for operating the calendar mecha onesegments. Radially opposite each of the day 30 nism of my invention, and that gear I6 is pref of the month designations 33 a peripheral notch 30 erably arranged on the inner side of plate I on a 34 is formed which is in all respects similar in pin II secured to said plate and is meshed with form, size and distance from the axis of spindle and driven by gear 9 on spindle 4.? Gear I0 is 4 to the notches 30 in indicator I4. The notches of a ratio of two to one with respect to gear 9, 34 for all of the day of the month designations, 35 so that it will make but one complete revolu except for the twenty-eighth, thirtieth and 35 tion for each two revolutions of gear 9, or one thirty-?rst days of the month are separated by revolution in every twenty-four hours. similar arcuate intermediate portions 35 ar Gear 9 may be provided as shownv in Fig. 6 ranged on a circle concentric with spindle 4, with an extended shaft or hub I2 which is bored 40 to telescope the spindle 4, and additionally, with thirtieth and thirty-?rst days. said hub. thirty-?rst day designations, differently formed I employ the shaft or hub I2 as a support for the three indicators I4, I5 and I6, for a corresponding number of friction driving plates,? as shown in Fig. 9, as at IT, I8 and I9. An additional and similar plate 20 is also pro 50 vided externally of the indicator I4. All of said driving plates are provided with ' central perforations '2I ?tting the shaft or hub I2 and'with inwardly projecting teeth 22 which 65 75 Opposite the . twenty-eighth, thirtieth 40 and peripheral cam segments 31, 3B and 39, respec tively, are provided on the indicator I5 inter 45 mediate the notches 34,-34, and said cam sec tions extend outwardly for gradually increasing distances from the portions 35, in the order named. ? a It will be observed that, as shown in Fig. 17, 50 the outer edges of the cam sections 31, 38 and 39 are inclined outwardly from their innermost to their outermost extremities and in the direction indicated by the sequence of the day of the month hub. Thus the plates I_'I, I3, I9 and 20 are ?xed designations in Fig. 17; and left hand lateral to and for rotation with the spindle 4. The indi edges thereof correspond in form and in position cators I4, I5 and I6, however are centrally bored to the similar edges of the teeth 36. as at 24 so as to loosely ?t the shaft or hub I2. The month indicator I6is provided ?with regu The extended forward portion of said shaft or larly spaced and annularly arranged month des hub I2 has an annular groove 25 thereon which ' ignations 40 and apertures 4I outwardly there 60 is engaged by a radially slotted spring washer 26 from and radially opposite said designations. of concave cross section, the slot 21 therein be Said indicator I6 also is provided opposite each ing adapted to engage the groove 25 in shaft or of the month designations with peripheral hub I2. , notches 42 which correspond in position and in The washer 26 serves to hold the friction driv form to the notches 30 in indicator I4 and 34 in 65 ing plates l1, l8, I9 and 20 in friction engage indicator I5. ment with the calendar indicators to which they At corresponding extremities of the notches 42 are adjacent, whereby the continuous rotation of opposite all months having thirty-one days teeth hub I2 tends to impart corresponding movement 43 are formed on the periphery of the indicator to the indicators, The movement of the indi I6 which correspond in position to the teeth 32 cators, except at the close of each day is pre on indicator I4 and 36 on indicator I5 but are vented by means hereinafter described. substantially longer than the teeth on said other By reference to Fig. 16 it will be observed that indicators. Each of themonth segments of indi the day of the week indicator I4, which is the cator I6 has a peripheral arcuate portion 44 cor outermost of the set of indicators, has marked responding as to distance from the axis of spindle 75 commonly engage a keyway 23 in said shaft or 60 cator I4, except opposite said twenty-eighth, a circular plate I3 forwardly of the plate I, and the hour hand 5 is secured to the outer end of 45 representing the days of the week, the days of the month'and the months of a year, and also 55 and projecting teeth 36 are provided, as on indi 2,056,905 3, 4 to the similar portions on the day of the week su?iciently to clear the outer ends of the teeth 32 and day of the month indicators, except such and 36 on the indicators l4 and I5. When so segments as are indicated by month abbrevia tions having less than thirty-one days. The month segments for February, April, June, September and November are provided, respec tively, with cam segments 45, 46, 41, 48 and 43 of variable form and length, corresponding to the number of days in such months. The segment 45 10 is the longest for the reason that it represents February with but 28 days and its length corre sponds to four of the day segments on the day of the month indicator l5, in order that a change may be made to March 1st at the close of Feb 15 ruary 28th. April having thirty days, the segment 46 is of a length corresponding to but two of the day segments, and the same is true for the cam seg ments 41, 48 and 49 opposite the June, September and November designations. All of the cam seg ments 45, 46, 41, 48 and 49 have outer edges which are inclined from the positions of lowest order to the positionsiof highest order, according to the sequence of designations on the indicator. For instance, the lowest point on cam segment 45 is opposite the February designation while the highest point thereon is opposite the March des ignation. The positions named correspond to the designation ?28? and ?1? on the day of the month 30 indicator. " I At the completion of each operation for chang ing the date the indicators l4, l5 and 16 'are set so that the notches 30, 34 and- 42 are in lateral registration; also the'aperture 29 on indicator l4 and the aperture 4| on indicator 16, for given dates, will register with each other and with one of the designations on the day of the month in dicator l5, as ?30? in Fig. 14. Thus the month designation is visible through an aperture 29 of indicator l4, and the day of the month is visible through an aperture 4| of the month indicator and also through an aperture 29 of the day of the week indicator. A detent 50 is oscillatably and siidably mount 45 ed on a transverse shaft 5i which is journaled in plates I and 2 and is extended outwardly from the plate 2 and is provided with a knob 52, by means of which the shaft maybe rotated. Detent 50 has an elongated hub 53 which is slidable on 50 shaft 5| against the tension of a compression spring 54 held on the shaft between hub 53 and plate 2. An elongated pin 55 is fixed to the free end of detent 50 and extends forwardly through plate i and under the indicators l4, l5 and i6 and is adapted to seat in the notches 30, 34 and 42 of said indicators, respectively, when the indi cators are at rest, for preventing the movement of the indicators and holding them at proper po sitions for indicating the dates. 60 > Detent 5D underlies an actuator 56 which may partake of the form of a pin attached to and pro-> iecting from a side of the gear ID. A hump 51 may be provided on the detent 50 for engagement with actuator 56. Thus, as gear 10 completes each revolution, once in each period of twenty four hours, the actuator 56 will engage the hump 51 of the detent 50, thereby releasing the pin 55 Irom the notches 30 and 34 of the day of the week and day of the month indicators 14 and i5, 70. respectively, so that both of said indicators will be free to rotateto the extent of one day segment for changing the date from one day to the next. From the ?rst to the next to the last of the month inclusive all operations of the indicators i4 and I5 are similar, the pin 55 being moved released, the indicators are caused to advance one step each in their rotation by means of the friction applied thereto from the driving plates l1, l8 and I9. On the last day of each month, however, the operation of the day of the month indicator varies to correspond to the number of days in the ex piring month, and the month indicator must also 10 operate at such times for properly changing the month indication on the calendar. As shown in Figs. 10 and 11, at the close of the 28th day of February, it is necessary to skip the 29th, 30th, and 31st day indications on the day of the month 15 indicator in order that the following designation may be the 1st day of March. Thus, opposite the 28th day indication on the indicator l5 the cam section 37 is so positioned that upon the release of the pin 55 of the detent 50 from the notches 30 20 and 34 of indicators 14 and I5, the initial move; ment of indicator l5 in a clockwise direction as seen in Fig. 10 will move the lower portion of cam segment 31 beneath the pin 55, and during the further movement of indicator l5 the inclined portion of segment 31 will engage and move pin 55 further from the periphery of indicator [5 to a point where it may engage the lower extremity of cam segment 45 on the month indicator IS. The month indicator, however, is held station 30 ary by the engagement of pin 55 with the radial shoulder at the lowest point on cam 45 opposite the notch 42 until cam 31 has moved the pin 55 into position for engagement with the peripheral ly inclined edge of cam 45. 'I'hereupon, with the pin 55 in the position shown in broken lines in Fig. 10, the month indicator will be free to rotate by the friction of its driving plates, and the con? tinued movement thereof will gradually move pin 55 outwardly from the periphery of indicator l5 so as to clear the cam segments 38 and 39 on the indicator l5, in succession. When the month indicator has progressed in its movement to a point at the remote end of cam segment 45 the pin 55 will drop behind the end of cam segment 39 upon the adjacent peripheral portion 35 of indicator l5 and will gradually find , its way into the notch 34 opposite the day desig nation ?1? on indicator l5. The further move ment of the month indicator and the day of the 50 month indicator is prevented by engagement or pin 55 with the teeth 43 and 36 on said indi cators, respectively. The day of the week indi cator will continue to advance until one of its teeth 32 also engages the pin 55, the day segments on the indicator l4 being substantially longer than the month segments on indicator l6 and the day segments on indicator l5. Each of the day segments on indicator I4 is longer at the periphery than the periphery of cam section 45 60 on the indicator l6 and exceed the peripheral length of the four day segments on indicator i5 corresponding to the four days from February 28th to March 1st. As shown in Figs. 12 and 13, when a change is 65 made from the 31st day of a month to the 1st day of a succeeding month the cam segment 33 on indicator I5 is positioned so that upon the release of pin 55 the day of the week indicator I 4 begins to advance, as does also the indicator l5, and the 70 continued movement of indicator [5 further moves the pin 55 by the engagement thereof ?with the edge of section 39. When the movement of indicator i5 has progressed to a point where the pin 55 is at the remote extremity of segment 33, 75 4 2,056,905 said pin 55 will drop upon the peripheral portion 35 and ?nally ?nd its way into the notch 34 of indicator I 5 and arrest the-movement of said indicator. In the meantime the cam segment 39 will have moved pin 55 su?iciently to clear the tooth 43 opposite the January designation on in dicator It, thus releasing the'month indicator. Thereupon the month indicator will continue to rotate until the pin 55 engages the near end of 10 cam segment 45 thereon, and the day of the week indicator will continue to rotate until said pin engages the tooth 32 opposite the proper day of in a clockwise direction for four-?fths of a revo lution until the position ?A? on the dial 63 is indicated, at which point the cam 59 will have 10 been completely restored to normal position, and pin 55 will have reengaged the notches in the indicators, preparatory to automatic operation. the week designation. In Figs. 14 and 15 I have shown the relative 15 positions of the three indicators for effecting a change of date from a month having thirty days to the ?rst day of a following month. In this instance the cam segment 38 on indicator I5 is 20 SI of the cam 59 will have retracted the detent 50 and its pin 55 from engagement with the actuator 56 and indicators I4, I6 and I5. whereupon the indicators may be moved manu ally to indicate the proper month, day of the month and day of the week. Following the set ting of the indicators, the knob 52 is then turned Indicators I5, I6 and I4 are reengaged by pin 55, in succession. as the cam 59 reaches positions ?C?, ?D? and ?E?, respectively, and at position ?A? said pin is positioned for reengagement with actuator 56. cam segment 46 on indicator I6, thereby suc It will be understood from a consideration of my invention that though I have shown and de 20 scribed my improved calendar mechanism in con cessively releasing the day of the week, the day nection with a clockv I may operate the same of the month and the month indicators. automatically merely as a calendar, by the ap effective for moving the pin 55 into position for engagement with and further movement by the Ob viously as pin 55 disengages cam segment 46 it _ plication of .power thereto from an electric or mechanical motor such as are used in the op 25 will arrest the further movement of the indi cator I5 and following that will arrest the move ment of indicator I6. The indicator It will con tinue to advance until pin 55 engages the tooth 32 thereon opposite the proper day of the week 30 designation. Cam segment 46 has a length cor responding to but two of the day of the month segments. No provision is made in this simpli?ed mech anism for changing the date at the end of Febru 85 ary in a leap year, and in such case the indicators must be set manually, as hereinafter described. The mechanism described is, however effective, without manual attention, for indicating the changes in date automatically for at least four 40 year periods. The detent 5D is resiliently held in position for engagement with the actuator 56 and with the indicators I 4, I5 and It, by means of a tension spring 58 which may be attached at its oppo 45 site ends, as shown in Fig. 2, to the pin II and the extremity'of the detent, or otherwise. Shaft 5| which supports the detent 50 carries a setting cam 59 which is ?xed thereto and the crowned periphery thereof is adapted to engage 503 a portion 60 of the detent, whereby the detent may be disengaged from the actuator 56 and the When applied to clocks the dial D is provided with an aperture, as shown in Fig. l, of such form and size and so positioned that the month, 35 day of the month and day of the week indica tions may be visible at the face of the dial. When arranged as shown, the appearance of the clock is unimpaired, and hour and minute of a day, the day of the week, day of the month and month are simultaneously and continuously 40 indicated. The mechanism is arranged preferably to effect the changes of date at midnight of each day, but may be arranged to make the changes at any 45 other suitable or desired hour of the day. What I claim, is: 1. A calendar mechanism comprising a power operated shaft, a plurality of superposed indica tors having designations thereon, respectively, for the months of a year, the days of a month and 50 the days of a week, all but the innermost of said indicators having apertures through which surface is subdivided into ?positions? and sections portions of the inner indicators are simultane of different form and length and include a posi tion of rest which is designated as position ?A?; a rather abrupt inclined section terminating at postion ?B?; and a gradually declined section having positions ?C?, ?D? and ?E? thereon at regularly spaced points, said sections being des ignated on the drawings as 5| and 62, respectively. Plate 2 is provided with a dial 533 on its outer face concentric with shaft 5I and provided with ously visible, for indicating the designation of a given date, means for applying power from 55 said shaft to said indicators independently, and means engageable and cooperating with periph eral portions of said indicators for normally hold mg the same against rotation and operative for releasing one or all of said indicators once in 60 each period of a calendar day, for changing the correspond to the positions on the cam 59. Knob 52 also has a pointer 55 which visibly indicates the particular position of the cam 59 at all times dates indicated thereby. 2. A calendar mechanism as speci?ed in claim 16, including: cooperating means associated with and for regulating the movement of said month 65 and said day of the month indicators, at the with respect to detent 5B. When it is desired to set the indicators I18, I5 spond to the number of days in a closing month. designations ?A?, "B?, ?C?, ?D? and ?E? which 70 motors and which are in use, as well as to clocks in the course of manufacture. said cam are shown in Figs. 19_and 20. The cam indicators I4, I5 and I6, at will. The details of 60 eration of clock mechanisms. The simplicity, form and arrangement of the mechanism herein shown and described readily adapts the mechanism to application to clocks which are either operated by spring or electric 30 and It, as at the end of February in a leap year, the knob 52 is turned in a clockwise direction as seen in Fig. 7 to the extent of one-?fth of a revo lution, at which the pointer 65 will register with the position "13? on dial 53, and the engagement 76 of the portion 60 of the detent 5D with the section end of any month in a calendar year, to corre 3. A calendar mechanism as speci?ed in claim 16, including: manually adjustable means for re tracting and extending .said releasable detent means, whereby said indicators may be manually set for a desired date, at will. _ 4. A calendar mechanism comprising a driving 75 2,056,905 means timed to rotate at a ?xed ratio relative to the number of hours in a calendar day, a plurality of indicators coaxially mounted and pro vided with month, day of the month and day of the week designations thereon, respectively, friction driving elements engaging said indica tors and connected with said driving means, a detent common to and for engagement with and 5 11. A calendar mechanism as speci?ed in claim 8, including peripheral means on the day of the month indicator for releasing and rendering the month indicator operative for changing the month designation at the end of a month, and peripheral means on the month indicator for varying the movement of the day of the month indicator to correspond to the number of days for normally holding said indicators stationary 10 in the intervals between the date; changing pe in a closing month. riods, and an actuator operatively )connected with said driving means and with said indicators, for automatically and selectively releasing said indi cators at corresponding times in each calendar 15 day, for indicating successive dates of a year. resetting thereof, at will. 5. A calendar mechanism as specified in claim 12. A calendar mechanism as specified in claim 10 8, including manually adjustable means for re leasing said detent from said indicators for the 13. A calendar mechanism comprising a power operated mechanism including a shaft, a plu 15 rality of co-axially mounted indicators arranged on corresponding faces thereof with month, day of the month and day of the week designations, the operation of said indicators at the close of ? respectively, means for operatively- connecting 20 each calendar month, to correspond to the num said indicators with said power operated mecha 20 ber of days in a closing month. nism for independent operation, detent means 4, including: cooperating means on said indica tors engageable with said detent, for regulating 6. A calendar mechanism as speci?ed in claim 4, including: manually adjustable means for ex tending and retracting said detent, so as to render 25 said indicators operative 0r inoperative, at will. 7. A calendar mechanism as speci?ed in claim 4, including: means formed in all but the inner most of said indicators, for rendering the cal endar designations on all of said indicators simul 30 and peripheral means on said indicators engage able with said detent means for normally hold ing said indicators stationary between the rate changing periods, and means for operably con ated mechanism whereby said indicators may be selectively released for rotation at the end of each calendar day, for indicating the successive taneously visible. dates in a year. 8. A calendar mechanism comprising a power operated means including a shaft, a plurality of 14. A calendar mechanism as speci?ed in claim 13, including: cooperating peripheral means on indicators having designations thereon, respec 25 necting said detent means with said power oper 30 said indicators, for regulating the movement of tively, for the months of a year, the days of a 35 month and the days of a week, said indicatorsv said month and said day of the month indicators, at the end of any month in a calendar year, to 35 being arranged in superposed relation for indi correspond to the number of days in a closing cating successive dates, means for establishing independent driving connections between said in dicators and said shaft for rotation, a detent 40 common to all of said indicators for normally holding said indicators stationary in the inter vals between the date changing periods, and means for operably connecting said detent with said power operated means for selectively releas 45 ing certain of said indicators once in each calen dar day, for changing the dates indicated, said indicators having peripheral portions adapted to be engaged by said detent. 9. A-calendar mechanism as speci?ed in claim 8, said indicators having peripheral segments ?for eifecting the operation of the day of the month indicator at the end of certain months, to cor respond to the number of days less than thirty one days in said months. 10. A calendar mechanism as speci?ed in claim 55 8, including peripheral means on the day of the month indicator for releasing and rendering the month indicator operative for changing the month designation at the end of the month. month. 7 15. A calendar mechanism as specified in claim 13, including: means for manually adjustingysaid detent, for setting said indicators at will. 40 16. A calendar mechanism comprising a power operated mechanism including a shaft, a plu rality of indicators coaxially mounted on said shaft and provided with month, day of the month and day of the week designations thereon, re 45 spectively, frictional driving elements on said shaft engaging and for rotating said indicators independently, a detent means, means on the peripheries of the said indicators engageable with said detent means for holding said indicators 50 stationary in the intervals between date chang ing periods, and means operatively connecting said detent means with said power operated mechanism, for releasing said detent from and to eifect the selective rotation of said indicators at corresponding periods in each calendar day, for changing the dates indicated thereby, suc cessively. ARTHUR P. NEYHART.