US3841086A - Time display mechanism - Google Patents

Time display mechanism Download PDF

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Publication number
US3841086A
US3841086A US00413243A US41324373A US3841086A US 3841086 A US3841086 A US 3841086A US 00413243 A US00413243 A US 00413243A US 41324373 A US41324373 A US 41324373A US 3841086 A US3841086 A US 3841086A
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United States
Prior art keywords
indicator
hour
display
minute
rotor
Prior art date
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Expired - Lifetime
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US00413243A
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English (en)
Inventor
M Robin
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Individual
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Individual
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    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B19/00—Indicating the time by visual means
    • G04B19/20—Indicating by numbered bands, drums, discs, or sheets
    • G04B19/21—Drums

Definitions

  • the hour display rotor is marked completely around its periphery with indicia indicating hours, conveniently 0 to 12 and the minute display rotor is marked with the indicia 0 to 60 about a portion of the minute display rotor surface leaving a space between the O and 60 marks, which space is equivalent to the spacing between two successive hour markings on the first display rotor.
  • An indicator is disposed over both display rotors to indicate the time.
  • Two alternative means are provided for moving the indicator at substantially the same speed as the hour display rotor during each hour but at the end of the hour to shift the indicator rapidly across the space between the 60 and 0 marks to assume a position over the next following hour indicia.
  • the indicator may comprise a pointer or, alternatively, a movable shutter having a window therein for indicating hours and a pointer for indicating minutes.
  • the present invention relates to a time display mechanism for displaying hours and minutes.
  • a time indicating mechanism comprising a first display rotor having indicia thereon representing hours and having means for connection to an hour shaft of a timepiece movement, a second display having indicia thereon representing zero to 60 minutes with a spacing between the 60 and minute marks equivalent to the spacing between two successive hour markings on the first display rotor and having means for connection to a minute shaft of a timepiece movement, an indicator mounted over said first and second display rotors to indicate the time in hours and minutes, and indicator moving means for moving the indicator, during each hour, in the same direction as the first display rotor, at a speed which is a function of the speed of the first display rotor to maintain said indicator substantially on the same hour marking and for shifting the indicator rapidly in the opposite direction through 'a distance equivalent to the spacing between the 60 and 0 minute marks at the end of each hour, in order to indicate the next following hour.
  • the present invention further relates to a timepiece having hour and minute drive shafts and a time display mechanism in accordance with the present invention of which the first display rotor is in driven engagement with the hour shaft and the second display rotor is in driven engagement with the minute shaft;
  • the pointer moving means may shift the pointer in accordance with the continuous forward movement of the hour display rotor and the reading of both the hours and the minutes is taken opposite the pointer.
  • the minute display rotor is furthermore scaled from 00 to 60through an arc of 330, a dead angle of results from this and at the 60th minute the pointer moves backwards by 30 to appear opposite the next hour and the scale 0 minute.
  • the display rotors may comprise drums, discs or concentrically disposed annular members.
  • This display mechanism serves to prevent any ambiguity in reading the time when one hour passes to the next.
  • FIG. 1 is a view in elevation of one embodiment of FIG. 2 is a view in cross-section along the line II--II.
  • FIG. 6 is a view in crosssection of the embodiment represented in FIG. 5;'
  • FIG.. 7 is a perspective view of a further, simplified embodiment of the invention.
  • FIG. 8 is a view in cross-section of the embodiment of FIG. 7.
  • FIGS, 1 and 2 represent a time display mechanism for displaying hours and minutes which comprises a support frame 1 in which are rotatably mounted a minute shaft 2 and an hourshaft which are connected in a known manner to for example a clockwork or electric movement not shown in the drawing.
  • a display rotor in the form of a drum 4 is fixed at one of its sides to the'minute shaft 2 and rests at its other side against a stud 5 which is firmly fixed to the support frame 1.
  • the drum 4 has a scale of minutes from 0 to 60, distributed over 330 of the peripheral surface thereof with a dead angle a of 30 between the 00 and 60 marks (FIGS. 3 and 4).
  • Another display rotor in the form of a drum 6 which carries a scale of hours from 1 to 12 is fixed on the hour shaft 3.
  • An indicator in the form of a pointer 7 firmly fixed to an arm 8 mounted so as to rotate freely around the shaft 2 is located opposite the hour drum 6 and the minute drum 4, the pointer 7 simultaneously indicating the hours and the minutes.
  • the arm 8 possesses an elongate aperture or slot 9 in which is mounted a stud l0 fixed to one end of a lever 11, which is mounted at its other end about a pivot pin 12 attached to a lug 13 firmly fixed to the support frame 1.
  • the lever 11 In its middle part, the lever 11 possesses a boss 14 by means of which it rests against a snail cam 15 which is firmly fixed to, and rotates with, the minute shaft 2 and which makes one revolution per hour.
  • the cam 15 possesses a spiral-shaped edge 16 of which the parts having the minimum and maximum radii are joined by a radial face 17.
  • the device operates in the following manner:
  • Both the minute drum 4 and the hour drum 6 are driven by their respective shafts, so as to rotate continuously in the direction of the arrow F; the arm 8 which is subject to the action of the cam 15 through the interengagement of the spiral-shaped edge 16 and the lever 11, moves in the direction of the arrow F as does the pointer 7, that is to say in the same direction as the hour drum 4, in order to balance the forward movement of the hour drum 4 and to hold the pointer opposite the particular hour indicated on the hour drum 6.
  • the boss 14 of the lever 11 is situated opposite the radial face 17 of the cam 15 (FIG. 1) and passes from a large radius to a small radius of the spiral shape edge 16.
  • the lever 11 falls, for example under the influence of gravity or a spring bias, it causes the arm 8 and the pointer 7 to shift or move backwards in the direction of the arrow F in the opposite direction to that F in which the drums rotate.
  • the shift corresponds to the dead angle a separating the scale numbers 60 to 0 of the minute drum 4.
  • the pointer 7 passes from the indication 9 hours 60 minutes to indicate the next hour which is 10 hours 00 minute on drums 4 and 6.
  • the pointer 7 can be replaced by an indicator in the form of a movable shutter l8 possessing a window 19 in which only the indication of the desired hour appears; the shutter also possesses a pointer 20 which moves opposite the minute indicator.
  • An aperture 22 is provided in a case 21 of the mechanism so that the window remains completely visible in its end positions.
  • the intermediate lever 11 is dispensed with.
  • the movable shutter 18 is connected by means of arms 24, 24a to a pivotally movable, eccentrically mounted shaft 23, one of the arms 24 is provided with a boss 25 which co-operates directly with the cam 15 firmly fixed to the shaft 2.
  • time display mechanism various modifications are possible, for example if the mechanism is to be used to indicate time on a 24 hour basis instead of a 12 hour one as described, the angle a would be 15 instead of 30 as with the illustrated embodiments.
  • the drums 4 and 6 may be replaced by display rotors in the form of discs or concentrically disposed annular members.
  • a time display mechanism for use with a timepiece movement having separate hour and minute drive shafts, said mechanism comprising:
  • a second display rotor having indicia thereon representing to 60 minutes with a spacing between a sixty minute mark and a zero minute mark equivalent to the spacing between two successive hour markings on the first display rotor and means for mounting said second display rotor on said minute shaft for rotation therewith;
  • an indicator mounted over said first and second display rotors to indicate the time in hours and minutes, said indicator being mounted for movement between first and second positions spaced apart by a distance equivalent to said spacing between two successive hour markings; and d. indicator moving means for moving said indicator in the same direction as said first display rotor from said first position to said second position during each hour and for rapidly shifting said indicator from said second position back to said first position at the end of each hour, whereby the indicator is moved from said first position to said second position at a speed which is a function of the speed of the first display rotor to maintain said indicator substantially on the same hour marking and is rapidly shifted back to its first position at the end of each hour in order to indicate the next following hour.
  • a mechanism as claimed in claim 1, wherein said indicator is freely movable about said minute shaft and said indicator moving means comprises:
  • a mechanism as claimed in claim 3, wherein said means operably coupling said lever to said indicator comprises an aperture in said indicator and a stud on said lever, which stud is engageable in said aperture.
  • said cam is a disc in the form of a snail cam having a spiral shaped peripheral edge with the minimum and maximum radii points thereof being connected by a radial face and wherein said radial face of said disc is so orientated that said cam follower is at the immediate vicinity of the maximum radius point when said indicator is over the sixtieth minute mark.
  • said indicator comprises a movable shutter having a window disposed over said first display rotor and a pointer located opposite said second display rotor.
  • said indicator moving means comprises:
  • first and second display rotors comprise first and second drums, respectively.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
US00413243A 1972-11-17 1973-11-06 Time display mechanism Expired - Lifetime US3841086A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7240990A FR2207301B1 (ru) 1972-11-17 1972-11-17

Publications (1)

Publication Number Publication Date
US3841086A true US3841086A (en) 1974-10-15

Family

ID=9107339

Family Applications (1)

Application Number Title Priority Date Filing Date
US00413243A Expired - Lifetime US3841086A (en) 1972-11-17 1973-11-06 Time display mechanism

Country Status (6)

Country Link
US (1) US3841086A (ru)
JP (1) JPS50871A (ru)
DE (1) DE2357313A1 (ru)
FR (1) FR2207301B1 (ru)
GB (1) GB1430668A (ru)
SU (1) SU564831A3 (ru)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110080811A1 (en) * 2009-10-05 2011-04-07 Daniel Moeder Handless time display

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5414683Y2 (ru) * 1975-04-30 1979-06-16
JPS5436274U (ru) * 1977-08-17 1979-03-09

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3712050A (en) * 1970-06-02 1973-01-23 T Kawada Digital indicating machine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3712050A (en) * 1970-06-02 1973-01-23 T Kawada Digital indicating machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110080811A1 (en) * 2009-10-05 2011-04-07 Daniel Moeder Handless time display
US7961561B2 (en) 2009-10-05 2011-06-14 Daniel Charles Moeder Handless time display

Also Published As

Publication number Publication date
JPS50871A (ru) 1975-01-07
SU564831A3 (ru) 1977-07-05
GB1430668A (en) 1976-03-31
FR2207301B1 (ru) 1975-11-07
DE2357313A1 (de) 1974-05-30
FR2207301A1 (ru) 1974-06-14

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