DEVICE FOR DISPLAYING A TIMEPIECE

Abstract

TIMEPIECE DISPLAY DEVICE The present invention relates to a display device (1) for displaying the time from 0h to 12h comprising a first display member (8) consisting of a polyhedron with a longitudinal central axis (A) and comprising n lateral faces (8a, 8b, 8d) regularly distributed around said axis (A), n being equal to 4, said first display member (8) being arranged to carry on each of its n lateral faces (8a, 8b, 8d) a first hour digit from a first series of hour digits 0 to n-1 arranged in a successive order, said first display member (8) being arranged to be movable in rotation around its axis (A), a second display member (10), arranged to display a second hour digit from a second series of hour digits chosen and arranged to be able to display all the hours by adding the first hour digit to the second hour digit,said second display member (10) being arranged to be movable relative to a dial, and at least one first drive mechanism (14) arranged to rotate the first display member (8) on itself around its axis (A) by 1 / n revolutions per hour so as to display, at each change of time, a new lateral face (8a, 8b, 8d) bearing the first following hour digit and to move the second display member (10) relative to the dial so that said second display member (10) displays the second following hour digit once every n 1 / n revolutions of the first display member (8) around its axis (A). Figure for the abstract: Fig. 2,

Description

Title of the invention: DEVICE FOR DISPLAYING A TIMEPIECE Technical field

[0001] The present invention relates to a device for displaying the time from 0 to 12 o'clock or from 0 to 24 o'clock for a timepiece.

[0002] The present invention also relates to a timepiece comprising such a display device. State of the art

[0003] Time display devices of a mechanical timepiece conventionally use an hour indicator hand and a minute indicator hand rotatably mounted in the center of a dial. Various other configurations are also proposed, generally based on the use of a single display member to display the hour and a single display member to display the minutes. Said display members are conventionally a hand moving on a dial or a dial sector or a disc appearing in an aperture.

[0004] Patent CH 88403 proposes a timepiece which gives the hours from zero to twenty-four by means of only a certain number of digits from zero to twenty-four, digits which are joined together by organs moved by the movement of the piece in such a way that the time indicated by the latter is equal to the sum of the indications which these organs join together. In one embodiment, the time display organs consist of two hands mounted rotatably in the center of the dial which only has the digits 0, 1, 2, 3, 5, 10, 15, and 20. In another embodiment, the time display organs consist of four prisms with triangular bases aligned on the dial and bearing Roman numerals. Additional organs must be provided to display the minutes.Displaying the time by hands therefore requires three hands to display the hour and minute, which can make the display complex, with a risk of error between the hands. Displaying the time by the four aligned prisms requires a complex mechanism to drive the four prisms, takes up all the space on the dial and prevents a simple display of the minute.

[0005] The present invention aims to remedy these drawbacks by proposing a time display device which allows an original display of the time by means of two display members occupying a reduced space on a dial while offering easy reading of the time.

[0006] Another object of the present invention is to provide a display device which also allows the minutes to be displayed by means of an indicator associated with one of the said display elements. Disclosure of the invention

[0007] To this end, the invention relates to a device for displaying the time from 0 to 12 o'clock or from 0 to 24 o'clock for a timepiece comprising a dial arranged to display at least the time.

[0008] According to the invention, said time display device comprises: - a first display member consisting of a polyhedron with a longitudinal central axis and comprising n lateral faces regularly distributed around said central axis, n being equal to 3, 4, 6 for a 12-hour display and n being equal to 3, 4, 6, 12 for a 24-hour display, said first display member being arranged to bear on each of its n lateral faces an hour figure from a first series of hour figures 0 to n-1 arranged in successive order, said first display member being arranged to be at least movable in rotation around its longitudinal central axis, - a second display member, preferably other than a polyhedron, arranged to display an hour figure from a second series of hour figures chosen and arranged to be able to display all the hours over 12 hours or 24 hours by adding the hour figure from the first series displayed by the first display member to the hour figure from the second series displayed by the second display member, said second display member being arranged to be movable relative to the dial, and - at least one first drive mechanism arranged to rotate the first display member on itself around its longitudinal central axis by 1 / n revolutions per hour so as to display, at each change of time, a new lateral face bearing the first following hour digit of the first series and to move the second display member relative to the dial so that said second display member displays the second following hour digit of the second series once every n 1 / n revolutions of the first display member around its longitudinal central axis.

[0009] Thus, said time display device according to the invention makes it possible to obtain the time by adding the hour digit displayed by the first display member with the hour digit displayed by the second display member which are two display members of a different nature, clearly distinct from one another for the user. Thus, the identification of the hour digits for calculating the time is facilitated.

[0010] Furthermore, the time display device according to the invention uses a single drive mechanism to actuate the first and second display members.

[0011]

[0012]

[0013]

[0014]

[0015] according to the planned programming. This drive mechanism is compact and reduces the size of the time display device. According to a preferred embodiment, the time display device according to the invention is arranged to be able to display the minutes on the dial. To this end, and advantageously, the first drive mechanism carries a minute indicator in the extension of the displayed lateral face of the first display member, and the dial carries a linear graduated minute scale, the first drive mechanism being arranged to move the minute indicator as well as the first display member along the graduated minute scale to indicate the minutes. Preferably, the first drive mechanism is arranged to move the minute indicator in a retrograde linear motion in one-hour cycles. The present invention also relates to a timepiece comprising a time display device as defined above. Brief description of the drawings Other characteristics and advantages of the present invention will appear on reading the following detailed description of an embodiment of the invention, given by way of non-limiting example, and made with reference to the appended drawings in which: - [Fig.l] is a schematic top view of the dial of a watch comprising a time display device according to a first variant of the invention; - [Fig.2] is a top view of the time display device according to the first variant of the invention; - [Fig.3] is an isometric view of the first drive mechanism and the first display member used in the invention; - [Fig.4] is a front view of the first drive mechanism and the first display member used in the invention; - [Fig.5] is a sectional view along line VV of [Fig.4]; - [Fig.6] is a top view of a time display device according to a second variant of the invention; and - [Fig.7a][Fig.7b][Fig.7c][Fig.7d] are front views of the first drive mechanism and the first display member used in the invention illustrating the successive positions of the indexing wheel at the time of a time change. Embodiments of the invention

[0016] The present invention relates to a time display device for a timepiece as well as a timepiece, and more particularly a mechanical timepiece such as a mechanical wristwatch, comprising such a time display device.

[0017] With reference to Figures 1 and 2, there is shown a first variant of the time display device 1 which notably comprises a dial 2 arranged to display at least the time.

[0018] This dial 2 has at least one display zone 4 for displaying the time, that is to say for displaying at least the hours, and preferably also the minutes as will be seen below, in order to display the current time. The display zone 4 occupies a restricted space making it possible to provide another zone 6 which can receive a decoration and / or another mechanism, such as a tourbillon.

[0019] According to the invention, the time display device 1 comprises a first display member 8 consisting of a single polyhedron with a longitudinal central axis A and comprising n planar lateral faces regularly distributed around said central axis A, and represented here under the references 8a, 8b, 8c, 8d. Preferably, each lateral face 8a, 8b, 8c, 8d, when displayed, appears above the dial 2 as being parallel to said dial 2. Advantageously, said first display member 8 is a right prism, preferably a regular right prism, that is to say a right prism whose base is a regular polygon with n sides. The longitudinal central axis A is the axis perpendicular to the base of the prism and the lateral faces are adjacent rectangles extending longitudinally along said central axis A.

[0020] According to the invention, n is equal to 3, 4, 6 for a 12-hour display and n is equal to 3, 4, 6, 12 for a 24-hour display.

[0021] The first display member 8 is therefore advantageously a tetrahedron, a regular right prism with a triangular base, a rectangular parallelepiped with a square base, a cube, a regular right prism with a hexagonal base or a dodecagonal base.

[0022] The first display member 8 is arranged to carry on each of its n lateral faces 8a, 8b, 8c, 8d a first hour digit of a first series of hour digits 0 to n-1 arranged in a successive order following the succession of the adjacent lateral faces.

[0023] The first display member 8 is arranged to be at least movable in rotation around its longitudinal central axis A, as will be detailed below.

[0024] The time display device 1 also comprises a second display member 10, preferably other than a polyhedron. The second display member 10 is arranged to display a second hour digit from a second series of hour digits chosen and arranged in a successive order to be able to display all the hours over 12 hours or 24 hours by adding the first hour digit from the first series displayed by the first display member to the second hour digit of the second series displayed by the second display member.

[0025] Said second display member 10 is arranged to be movable relative to the dial 2. Advantageously, the second display member 10 is rotatably mounted relative to the dial 2. The second display member 10 is for example a disc or a hand. Preferably, the second display member 10 is a disc with a center C rotatably mounted under the dial 2. The dial 2 comprises an aperture 12 arranged to be able to display one of the second hour numerals of the second series carried by the second display member in the form of a disc positioned under the dial 2 when said second numeral appears opposite said aperture 12.

[0026] The time display device 1 also comprises at least a first drive mechanism 14 arranged to rotate the first display member 8 on itself around its longitudinal central axis A by 1 / n revolutions per hour so as to display, at each change of time, a new lateral face 8a, 8b, 8c, 8d advantageously parallel to the dial 2 and bearing the first following hour digit of the first series and to move the second display member 10 relative to the dial 2 so that said second display member 10 displays the second following hour digit of the second series once every n 1 / n revolutions of the first display member 8 around its longitudinal central axis A, i.e. every n hours.

[0027] For this purpose, advantageously, and with reference to figures 3 to 5, the first drive mechanism 14 comprises a chassis 15 carrying the first display member 8 mounted to rotate around its longitudinal central axis A as well as an indexing wheel 16 mounted to rotate preferably along an axis of rotation B parallel to the axis A. Said indexing wheel 16 comprises n arms 18 regularly distributed around the axis B and is kinematically linked to the first display member 8 via a gear train 19 as will be described in detail below.

[0028] The first drive mechanism 14 also comprises a control finger 20 arranged to cooperate successively with each of the n arms 18 of the indexing wheel 16 to instantly rotate said indexing wheel 16 by 1 / n revolution at each change of time, that is to say just before the start of each new hour. The control finger 20 and the indexing wheel 16 are movable relative to each other.

[0029] The indexing wheel 16 also comprises a protrusion 22 arranged to rotate an hour wheel 24 once every n 1 / n revolutions of the first display member 8, i.e. every n hours. Said hour wheel 24 is kinematically linked to the second display member 10 by a gear train 26 arranged so that said second display member 10 displays the next second hour digit of the second series every n hours when the hour wheel 24 is actuated by the protrusion 22 of the indexing wheel 16. The n arms 18 extend radially relative to the axis B while the protrusion 22 is an axial extension of the n-th arm and extends perpendicular to the n arms 18, in the direction of the hour wheel 24. This configuration makes it possible to have a jumping display of the second hour digit of the second series of hour digits carried by the second display member 12.

[0030] It is also possible to provide another mechanism arranged so that a rotation of the indexing wheel causes a trailing movement of the second display member 10.

[0031] A return finger 28 is also provided, arranged to be able to cooperate with the indexing wheel 16 in order to ensure the position of said indexing wheel 16 and therefore of the first display member 8.

[0032] According to a particularly preferred embodiment, the display device 1 according to the invention comprises a second drive mechanism arranged to move the chassis 15 of the first drive mechanism 14, and therefore the first display member 8, relative to the dial 2 according to a periodic movement of one hour and to allow said first drive mechanism 14 to be able to rotate the first display member 8 during each of these periodic movements of one hour.

[0033] According to this preferred embodiment, the chassis 15 on which the first display member 8 is rotatably mounted around its longitudinal central axis A and on which the indexing wheel 16 is rotatably mounted around its axis of rotation B, is therefore movable relative to the dial 2.

[0034] According to a first variant embodiment shown more specifically in Figures 1 and 2, the chassis 15 is movable in translation relative to the dial 2, and the second drive mechanism is arranged to move the chassis 15 between an initial position PI and a final position P2 in one direction in a dragging manner for one hour and to return the chassis 15 in the other direction to its initial position PI instantaneously. The first display member 8 therefore has a retrograde linear movement according to one-hour cycles.

[0035] The second drive mechanism may for example comprise a threaded rod 32 and a nut 33 secured to the chassis 15 and arranged to cooperate with the threaded rod 32, said threaded rod 32 being driven by the clockwork movement of the timepiece so that the rotational movement of the threaded rod is transformed into a translational movement for the nut 33 and therefore for the chassis 15. Said chassis 15 is arranged to receive the threaded rod and is connected via said threaded rod 32 to a retrograde mechanism (not shown) arranged to instantly return the chassis 15 to its initial position PI just after reaching the final position P2. It is It is also possible to provide a disengagement of the nut from the threaded rod.

[0036] It is obvious that other linear drive mechanisms, such as a rack drive mechanism or any other suitable mechanism, associated with a retrograde mechanism can be used to move the chassis 15 in translation.

[0037] The chassis 15 is positioned relative to the hour wheel 24 so that said hour wheel 24 is located in the travel of the chassis 15. In this perspective, the hour wheel 24 advantageously comprises at least one retractable finger 24a arranged to be able to retract when the chassis 15 is moved between its initial position PI and its final position P2, in particular when the protuberance 22 of the indexing wheel 16 is in its active position at each n-th 1 / n revolution of the first display member 8, and to be able to cooperate with the protuberance 22 of the indexing wheel 16 when it occupies its active position at the n-th 1 / n revolution of the first display member 8 and the chassis 15 is instantly returned to its initial position PI.

[0038] The control finger 20 is also positioned to be located in the travel of the chassis 15. Preferably, the control finger 20 is mounted on a support fixed relative to the dial 2 and is arranged to be able to retract when the chassis 15 is moved between its initial position PI and its final position P2 and to be able to rotate the indexing wheel 16 and therefore the first display member 8, at each change of time, by 1 / n revolution via the cooperation of the control finger 20 with the x-th arm 18 which is in its active position at the x-th 1 / n revolution of the first display member 8, x=1 to n, at each passage of the chassis 15 in front of said control finger 20 when said chassis 15 is instantly returned to its initial position PI, once per hour.

[0039] According to a second variant embodiment shown more specifically in [Fig. 6], the chassis 15 is in the form of a carriage and is movable in rotation relative to the dial 2. When the second display member 10 is the disc mounted rotatably with center C as in the first variant embodiment described above, the chassis 15 is movable in rotation, for example with center C around the second display member 10 as shown here.

[0040] The second drive mechanism may for example comprise a toothed wheel 34 arranged to cooperate with the chassis 15 so that said chassis 15 is driven in rotation in a retrograde manner or by rotating continuously always in the same direction.

[0041] The chassis 15 is positioned relative to the hour wheel 24 so that said hour wheel 24 is located in the travel of the chassis 15. In this perspective, the hour wheel 24 comprises at least one finger 24a, retractable in the case of a second retrograde drive mechanism, arranged to be able to cooperate with the protuberance 22 of the indexing wheel 16 when it occupies its active position at the n-th 1 / n revolution of the first display member 8 and the chassis 15 passes in front of the hour wheel 24.

[0042] The control finger 20 is also positioned to be located in the travel of the chassis 15. Preferably, the control finger 20 is mounted on a support fixed relative to the dial 2 and is arranged to be able to rotate the indexing wheel 16 and therefore the first display member 8, at each change of time, by 1 / n revolution via the cooperation of the control finger 20 with the x-th arm 18 which is in its active position at the x-th 1 / n revolution of the first display member 8, at each passage of the chassis 15 in front of said control finger 20, once per hour. In the case of continuous driving of the chassis 15, the finger 20 must be located opposite the hour wheel 24 so that the jump of the first display member 8 is simultaneous with the jump of the second display member 10.

[0043] In another variant not shown in which the chassis 15 of the first drive mechanism 14 is fixed, it is the support of the control finger 20 which is then arranged in a mobile manner to be able to rotate the indexing wheel 16 at each change of time.

[0044] Preferably, whatever the embodiment variant of the display device according to the invention, the first display member 8 is mounted flying on the chassis 15 of the first drive mechanism 14 by a single base 35 of the polyhedron.

[0045] With particular reference to Figures 3 to 5, the chassis 15 advantageously carries the transmission gear train 19 kinematically linked to the transmission wheel 16 and the base 35 of the polyhedron of the first display member 8 on the side of the chassis 15 is arranged to carry a drive wheel 36 coaxial with the longitudinal central axis A and arranged to cooperate with the transmission gear train 19 to drive the first display member 8 in rotation by 1 / n revolution when the indexing wheel 16 rotates by 1 / n revolution. More specifically, the transmission gear train 19 comprises a wheel 38 secured and coaxial with the axis B of the indexing wheel 16, a transmission shaft 40 extending parallel to the longitudinal central axis A of the first display member 8 and comprising two wheels 40a, 40b. Wheel 40a meshes with wheel 38 and wheel 40b meshes with drive wheel 36.

[0046] Advantageously, the first display member 8 is arranged to be traversed by a shaft 42, here a screw, coaxial with the longitudinal central axis A and secured to the chassis 15 and around which are arranged guide ball bearings 44 fitted into the first display member 8 allowing the polyhedron to rotate around the shaft 42 along the longitudinal central axis A.

[0047] In the variants shown, the first display member 8 is a parallelepiped with a square base, n being equal to 4, and whose rectangular lateral faces 8a, 8b, 8c, 8d bear the numbers 0, 1, 2, 3 in successive order. In this case, the second display member 10 is advantageously a rotatably mounted disc with a center C and bearing the numbers 0, 4 and 8 in order. This configuration allows a display of the time over 12 hours by adding the number displayed by the first display member 8 with the number displayed on the second display member 10.

[0048] According to other variants not shown, when n is equal to 4, the second display member 10 may be a disc bearing the numbers 0, 4, 8, 12, 16 and 20 for a 24-hour time display. When n is equal to 3, the first display member 8 is a right prism with a triangular base whose lateral faces bear the numbers 0, 1, 2 and the second display member 10 is a disc bearing in order the numbers 0, 3, 6, 9 for a 12-hour display and the numbers 0, 3, 6, 9, 12, 15, 18, 21 for a 24-hour display. When n is equal to 6, the first display member 8 is a right prism with a hexagonal base whose lateral faces bear the numbers 0, 1, 2, 3, 4, 5 in successive order and the second display member 10 is a disc bearing in order the numbers 0, 6 for a 12-hour display and the numbers 0, 6, 12, 18 for a 24-hour display.When n is equal to 12, the first display member 8 is a right prism with a dodecagonal base whose lateral faces bear the numbers 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 in successive order and the second display member 10 is a disc bearing in order the numbers 0, 12 for a 24-hour display.

[0049] Advantageously, in the variants for which the chassis 15 is movable according to a periodic movement of one hour, the display device according to the invention is arranged to be able to display the minutes on the dial 2. For this purpose, the first drive mechanism 14, and more particularly the chassis 15, carries a minute indicator 46, for example of substantially triangular shape, arranged to be in the extension of the displayed lateral face 8a, 8b, 8c, 8d of the first display member 8. The dial 2 carries a graduated minute scale 48 and the first drive mechanism 14 is arranged to move the minute indicator 46 as well as the first display member 8, carried by the chassis 15, along the graduated minute scale 48 to indicate the minutes.As described above in connection with the first alternative embodiment, the first drive mechanism 14 is preferably arranged to move the minute indicator 46 in a retrograde linear motion in one-hour cycles.

[0050] The operation of the time display device 1 according to the invention is described with reference to [Fig.l]. The chassis 15 is in its initial position PI and carries the first display member 8 which displays the first hour digit 1 and the minute indicator 46 which indicates the minute digit 0. The second display member 10 displays in the window 12 the second hour digit 0. It is therefore IhOO (= 1+0). The second drive mechanism moves linearly for one hour, along the minute scale 48, the chassis 15, and therefore the first display member 8 and the minute indicator 46 to the final position P2. After one hour, the time displayed is therefore "1h60". The retrograde mechanism associated with the second drive mechanism then instantly returns the chassis 15, and therefore the first display member 8 and the minute indicator 46 towards the initial position PL During its return stroke to the initial position PI, the chassis 15 also carrying the indexing wheel 16 approaches the control finger 20, as shown in [Fig.7a]. When the chassis 15 approaches its initial position PI, the arm 18 opposite the control finger 20 comes into contact with said control finger 20 as shown in [Fig.7b].The chassis 15 continuing to approach its initial position PI, the control finger 20 pushes the arm 18 causing the rotation of the indexing wheel 16 by a quarter turn (n=4), and therefore of the transmission gear train 19 and of the first display member 8, as shown in [Fig.7c]. The chassis 15 returns to its initial position PI and the return finger 28 is positioned to ensure the position of said indexing wheel 16 and therefore of the first display member 8, as shown in [Fig.7d]. The first display member 8 having also rotated a quarter of a turn with the indexing wheel 16, the first number displayed by said first display member is now the number 2. The chassis 15 having returned to its initial position PI, the minute indicator 46 has returned to its position at 0. The second display member 10 has remained on the second number 0. It is therefore 2:00 (= 2+0).When the first display member 8 has made ¾ of a turn, the first number displayed is the number 3. It is therefore 3:00 (= 3+0). When the chassis 15 is returned by the retrograde mechanism to its initial position PI, the control finger 20 pushes the fourth arm 18 opposite to cause the rotation of the indexing wheel 16 and therefore of the first display member 8 by the 4th quarter turn so that the first display member 8 again displays the first number 0. At the same time, the protrusion 22 of the indexing wheel 16 passing in front of the finger 24a drives the hour wheel 24 and therefore the second display member 10 which now displays the second number 4. It is therefore 4:00 (= 0+4). And so on.

[0051] The time display device according to the invention allows an original display of the time.

Claims

1. Claims Device (1) for displaying the time from 0 to 12 o'clock or from 0 to 24 o'clock for a timepiece comprising a dial (2) arranged to display at least the time, characterized in that said time display device (1) comprises: - a first display member (8) consisting of a polyhedron with a longitudinal central axis (A) and comprising n lateral faces (8a, 8b, 8c, 8d) regularly distributed around said longitudinal central axis (A), n being equal to 3, 4, 6 for a 12-hour display and n being equal to 3, 4, 6, 12 for a 24-hour display, said first display member (8) being arranged to carry on each of its n lateral faces (8a, 8b, 8c, 8d) a first hour digit of a first series of hour digits 0 to n-1 arranged in successive order, said first display member (8) being arranged to be at least movable in rotation around its longitudinal central axis (A), - a second display member (10), preferably other than a polyhedron, arranged to display a second hour digit from a second series of hour digits chosen and arranged to be able to display all the hours over 12 hours or 24 hours by adding the first hour digit of the first series displayed by the first display member (8) to the second hour digit of the second series displayed by the second display member (10), said second display member (10) being arranged to be movable relative to the dial (2), and - at least one first drive mechanism (14) arranged to rotate the first display member (8) on itself around its longitudinal central axis (A) by 1 / n revolutions per hour so as to display, at each change of time, a new lateral face (8a, 8b, 8c, 8d) bearing the first following hour digit of the first series and to move the second display member (10) relative to the dial (2) so that said second display member (10) displays the second following hour digit of the second series once every n 1 / n revolutions of the first display member (8) around its longitudinal central axis (A).

2. Display device according to claim 1, characterized in that the first drive mechanism (14) comprises a chassis (15) carrying the first display member (8) and an indexing wheel (16) kinematically linked to the first display member and comprising n arms (18) regularly distributed, a control finger (20) arranged to cooperate successively with each of the n arms (18) to rotate said indexing wheel (16) by 1 / n revolution at each change of time, said indexing wheel (16) comprising a protuberance (22) arranged to be able to rotate an hour wheel (24) once every n 1 / n revolutions of the first display member (8), said hour wheel (24) being kinematically linked to the second display member (10) so that said second display member (10) displays the next second hour digit of the second series when the hour wheel (24) is actuated by the protrusion (22) of the indexing wheel (16).

3. Display device according to claim 2, characterized in that it comprises a second drive mechanism arranged to move the chassis (15) of the first drive mechanism (14) relative to the dial (2) according to a periodic movement of one hour and to allow the first drive mechanism (14) to be able to rotate the first display member (8) during each of these periodic movements.

4. Display device according to claim 3, characterized in that the chassis (15) is movable in translation relative to the dial (2), the second drive mechanism being arranged to move the chassis (15) between an initial position (PI) and a final position (P2) in one direction for one hour and to return the chassis (15) in the other direction to its initial position instantaneously.

5. Display device according to claim 4, characterized in that the hour wheel (24) comprises at least one retractable finger (24a) arranged to be able to retract when the chassis (15) is moved between its initial position (PI) and its final position (P2) and to be able to cooperate with the protuberance (22) of the indexing wheel (16) when the chassis (15) is instantly returned to its initial position (PI).

6. Display device according to one of claims 4 and 5, characterized in that the control finger (20) is arranged to be able to retract when the chassis (15) is moved between its initial position (PI) and its final position (P2) and to be able to rotate the indexing wheel (16) each time the chassis (15) passes in front of said control finger (20) when said chassis (15) is instantly returned to its initial position.

7. Display device according to claim 3, characterized in that the chassis (15) is rotatable relative to the dial (2).

8. Display device according to claim 7, characterized in that the hour wheel (24) comprises at least one finger (24a) arranged to be able to cooperate with the protuberance (22) of the indexing wheel (16) when the chassis (15) passes in front of the hour wheel (24).

9. Display device according to one of claims 7 and 8, characterized in that the control finger (20) is arranged to be able to rotate the indexing wheel (16) each time the chassis (15) passes in front of said control finger (20).

10. Display device according to one of claims 2 to 9, characterized in that the first display member (8) is mounted flying on the chassis (15) of the first drive mechanism (14) by a single base of the polyhedron.

11. Display device according to claim 10, characterized in that the chassis (15) carries a transmission gear train (19) kinetically linked to the transmission wheel (16), and in that the base (35) of the polyhedron of the first display member (8) on the side of the chassis (15) is arranged to carry a drive wheel (36) coaxial with the longitudinal central axis (A) and arranged to cooperate with said transmission gear train (19) to drive the first display member (8) in rotation by 1 / n revolution when the indexing wheel (16) rotates by 1 / n revolution.

12. Display device according to one of the preceding claims, characterized in that the first display member (8) is a parallelepiped with a square base, n being equal to 4, and whose lateral faces (8a, 8b, 8c, 8d) bear the numbers 0, 1, 2, 3 in successive order and in that the second display member (10) is a disc mounted to rotate and bearing the numbers 0, 4 and 8.

13. Display device according to one of the preceding claims, characterized in that it is arranged to be able to display the minutes on the dial (2).

14. Display device according to claim 13, characterized in that the

15.

16. first drive mechanism (14) carries a minute indicator (46) in the extension of the displayed lateral face (8a, 8b, 8c, 8d) of the first display member (8), and in that the dial (2) carries a linear graduated minute scale (48), the first drive mechanism (14) being arranged to move the minute indicator (46) as well as the first display member (8) along the graduated minute scale (48) to indicate the minutes. A display device according to claim 14, characterized in that the first drive mechanism (14) is arranged to move the minute indicator (46) in a retrograde linear motion in one-hour cycles. Timepiece comprising a display device (1) according to one of claims 1 to 15.

Images