DISPLAY DEVICE FOR A CLOCKWORK PART

Abstract

DISPLAY DEVICE FOR A CLOCKWORK PART The present invention relates to a time display device (1) for the time from 0 to 12, comprising a first display element (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 element (8) being arranged to bear 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 successive order, said first display element (8) being arranged to be rotatable about its axis (A), a second display element (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 addition of the from the first hour digit to the second hour digit,said second display element (10) being arranged to be movable relative to a dial, and at least one first drive mechanism (14) arranged to rotate the first display element (8) about its axis (A) by 1 / n of a revolution per hour so as to display, at each change of hour, a new lateral face (8a, 8b, 8d) bearing the next first hour digit and to move the second display element (10) relative to the dial so that said second display element (10) displays the next second hour digit once every n 1 / n revolutions of the first display element (8) about its axis (A). Figure for the abbreviation: Fig. 2,

Description

Title of the invention: DISPLAY DEVICE FOR A CLOCK PART technical field

[0001] The present invention relates to a time display device 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] The time display devices of a mechanical timepiece conventionally use an hour indicator hand and a minute indicator hand mounted to rotate in the center of a dial. Various other configurations are also available, generally based on the use of a single display element to show the hour and a single display element to show the minutes. These display elements are conventionally a hand moving on a dial or a sector of a dial, or a disc appearing in an aperture.

[0004] Swiss patent CH 88403 describes a timepiece that indicates the hours from zero to twenty-four by means of only a certain number of digits from zero to twenty-four, digits which are connected by elements driven by the movement of the timepiece in such a way that the time indicated by the latter is equal to the sum of the indications connected by these elements. In one embodiment, the time display elements consist of two rotating hands mounted in the center of the dial, which bears only the numerals 0, 1, 2, 3, 5, 10, 15, and 20. In another embodiment, the time display elements consist of four triangular prisms aligned on the dial and bearing Roman numerals. Additional elements must be provided to display the minutes.Displaying the time with hands requires three hands to show the hour and minute, which can make the display complex and introduce a risk of error between the hands. Displaying the time with four aligned prisms requires a complex mechanism to drive the four prisms, occupies the entire dial, and prevents a simple minute display.

[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 elements occupying a small space on a dial while offering easy reading of the time.

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

[0007] For this purpose, the invention relates to a time display device 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 element consisting of a polyhedron with a central longitudinal 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 element being arranged to bear on each of its n lateral faces an hour digit from a first series of hour digits 0 to n-1 arranged in successive order, said first display element being arranged to be at least mobile in rotation around its central longitudinal axis, - a second display element, preferably not a polyhedron, arranged to display an hour digit from a second series of hour digits chosen and arranged to be able to display all the hours over 12 or 24 hours by adding the hour digit of the first series displayed by the first display element to the hour digit of the second series displayed by the second display element, said second display element 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 of a turn per hour so as to display, at each change of hour, a new lateral face bearing the next first 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 next second hour digit of the second series once every n 1 / n turns of the first display member around its longitudinal central axis.

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

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

[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 side face of the first display organ, 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 organ 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 features and advantages of the present invention will become apparent from the following detailed description of an embodiment of the invention, given by way of non-limiting example, and made with reference to the accompanying drawings in which: - [Fig.1] 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 element used in the invention; - [Fig.4] is a front view of the first drive mechanism and the first display element used in the invention; - [Fig.5] is a cross-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 - Figs. 7a][7b][7c][7d] are front views of the first drive mechanism and the first display element 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 and to 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, a first variant of the time display device 1 is shown, which includes in particular a dial 2 arranged to display at least the time.

[0018] This dial 2 has at least one display area 4 for displaying the time, that is, 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 area 4 occupies a limited space allowing for another area 6 which can accommodate a decoration and / or another mechanism, such as a tourbillon.

[0019] According to the invention, the time display device 1 comprises a first display element 8 consisting of a single polyhedron with longitudinal central axis A and comprising n flat lateral faces regularly distributed around said central axis A, and represented herein by reference numerals 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 element 8 is a right prism, preferably a regular right prism, that is to say, a right prism whose base is a regular n-sided polygon. 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 12h display and n is equal to 3, 4, 6, 12 for a 24h display.

[0021] The first display element 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 with a dodecagonal base.

[0022] The first display element 8 is arranged to carry on each of its n lateral faces 8a, 8b, 8c, 8d a first hour digit from 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 organ 8 is arranged to be at least mobile in rotation around its longitudinal central axis A, as will be detailed below.

[0024] The time display device 1 also includes a second display element 10, preferably not a polyhedron. The second display element 10 is arranged to display a second hour digit from a second series of hour digits chosen and arranged in a sequential order so as to display all the hours over 12 or 24 hours by adding the first hour digit of the first series displayed by the first display unit at the second hour digit of the second series displayed by the second display unit.

[0025] Said second display element 10 is arranged to be movable relative to the dial 2. Advantageously, the second display element 10 is mounted to rotate relative to the dial 2. The second display element 10 is, for example, a disc or a pointer. Preferably, the second display element 10 is a disc with center C mounted to rotate below the dial 2. The dial 2 includes an aperture 12 arranged to display one of the second hour digits of the second series carried by the second display element in the form of a disc positioned below the dial 2 when said second digit appears opposite said aperture 12.

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

[0027] To this end, 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 about its longitudinal central axis A and an indexing wheel 16 mounted to rotate preferably about 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 includes a control finger 20 arranged to cooperate successively with each of the n arms 18 of the indexing wheel 16 to rotate said indexing wheel 16 instantaneously by 1 / n revolution at each hour change, that is, 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 includes 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 with respect to the axis B while the protrusion 22 is an axial extension of the nth arm and extends perpendicularly to the n arms 18, in the direction of the hour wheel 24. This configuration allows for a jumping display of the second hour digit of the second series of hour digits carried by the second display element 12.

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

[0031] A return finger 28 is also provided, arranged 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 includes 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 in a periodic movement of one hour and to allow said first drive mechanism 14 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 mounted to rotate about its longitudinal central axis A and on which the indexing wheel 16 is mounted to rotate about its axis of rotation B, is therefore movable relative to the dial 2.

[0034] According to a first 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 opposite direction to its initial position PI instantaneously. The first display element 8 therefore has a retrograde linear movement in one-hour cycles.

[0035] The second drive mechanism may, for example, comprise a threaded rod 32 and a nut 33 integral with the frame 15 and arranged to cooperate with the threaded rod 32, said threaded rod 32 being driven by the clockwork mechanism of the timepiece such that the rotational movement of the threaded rod is transformed into a translational movement for the nut 33 and thus for the frame 15. Said frame 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 frame 15 to its initial position P1 immediately after reaching the final position P2. It is It is also possible to provide for a disengagement of the nut relative to the threaded rod.

[0036] It is quite obvious that other linear drive mechanisms, such as a rack and pinion 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 in the travel of the chassis 15. In this perspective, the hour wheel 24 advantageously includes 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 every nth 1 / n turn 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 nth 1 / n turn of the first display member 8 and the chassis 15 is returned instantaneously 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 fixed support 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 hour, by 1 / n turn 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 turn of the first display member 8, x=l to n, at each passage of the chassis 15 in front of said control finger 20 when said chassis 15 is returned instantaneously to its initial position PI, once per hour.

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

[0040] The second drive mechanism may for example include 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 such that said hour wheel 24 lies within 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 nth 1 / n turn of the first display organ 8 and the chassis 15 passes in front of the hour wheel 24.

[0042] The control finger 20 is also positioned to lie within the travel of the frame 15. Preferably, the control finger 20 is mounted on a fixed support relative to the dial 2 and is arranged to rotate the indexing wheel 16, and thus the first display element 8, by 1 / n of a revolution at each hour change, through the interaction of the control finger 20 with the xth arm 18, which is in its active position at the xth 1 / n of a revolution of the first display element 8, each time the frame 15 passes in front of said control finger 20, once per hour. In the case of continuous drive of the frame 15, the finger 20 must be positioned opposite the hour wheel 24 so that the jump of the first display element 8 is simultaneous with the jump of the second display element 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 in order to be able to rotate the indexing wheel 16 at each change of hour.

[0044] Preferably, regardless of the variant of the display device according to the invention, the first display element 8 is mounted free-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 frame 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 element 8 on the side of the frame 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 element 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 fixed to 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 element 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 fixed 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 element 8 is a parallelepiped with a square base, n being equal to 4, and whose rectangular lateral faces 8a, 8b, 8c, 8d bear the digits 0, 1, 2, 3 in successive order. In this case, the second display element 10 is advantageously a rotating disk mounted at center C and bearing the digits 0, 4, and 8 in order. This configuration allows the time to be displayed over 12 hours by adding the digit displayed by the first display element 8 to the digit displayed on the second display element 10.

[0048] According to other variants not shown, when n equals 4, the second display element 10 can be a disc bearing the numbers 0, 4, 8, 12, 16 and 20 for a 24-hour time display. When n equals 3, the first display element 8 is a right triangular prism whose lateral faces bear the numbers 0, 1, 2 and the second display element 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 element 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 element 10 is a disc bearing in order the numbers 0, 6 for a 12h display and the numbers 0, 6, 12, 18 for a 24h display.When n equals 12, the first display element 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 element 10 is a disc bearing the numbers 0, 12 in order for a 24h display.

[0049] Advantageously, in the variants for which the chassis 15 is mobile 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 lateral face 8a, 8b, 8c, 8d displayed by 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 relation to the first 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. 1]. The chassis 15 is in its initial position P1 and carries the first display element 8 which displays the first hour digit 1 and the minute indicator 46 which indicates the minute digit 0. The second display element 10 The second hour digit, 0, is displayed in window 12. It is therefore IhOO (= 1+0). The second drive mechanism linearly moves the chassis 15, and thus the first display element 8 and the minute indicator 46, along the minute scale 48 for one hour to the final position P2. After one hour, the displayed time is therefore "lh60". The retrograde mechanism associated with the second drive mechanism then instantaneously returns the chassis 15, and thus the first display element 8 and the minute indicator 46, towards the initial position PL. During its return stroke to the initial position PI, the chassis 15, which also carries 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].As the chassis 15 continues to approach its initial position PI, the control finger 20 pushes the arm 18, causing the indexing wheel 16 to rotate a quarter turn (n=4), and thus the transmission gear train 19 and the first display element 8, as shown in [Fig. 7c]. The chassis 15 returns to its initial position PI, and the return finger 28 positions itself to secure the position of the indexing wheel 16 and thus the first display element 8, as shown in [Fig. 7d]. The first display element 8 having also rotated a quarter turn with the indexing wheel 16, the first digit displayed by said first display element is now the digit 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 element 10 has remained on the second digit 0. It is therefore 2:00 (= 2+0).When the first display element 8 has completed three-quarters of a turn, the first digit displayed is the number 3. It is therefore 3:00 (= 3+0). When the frame 15 is returned by the retrograde mechanism to its initial position PI, the control finger 20 pushes the fourth arm 18 opposite it to cause the indexing wheel 16, and thus the first display element 8, to rotate by the fourth quarter turn, so that the first display element 8 again displays the first digit 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 thus the second display element 10, which now displays the second digit 4. It is therefore 4:00 (= 0+4). And so on.

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

Claims

1. Demands Time display device (1) for a timepiece from 0 to 12 o'clock or from 0 to 24 hours comprising a dial (2) arranged to display at least the time, characterized in that said time display device (1) comprises: - a first display element (8) consisting of a polyhedron with a central longitudinal axis (A) and comprising n lateral faces (8a, 8b, 8c, 8d) regularly distributed around said central longitudinal axis (A), n being equal to 3, 4, 6 for a 12h display and n being equal to 3, 4, 6, 12 for a 24h display, said first display element (8) being arranged to bear on each of its n lateral faces (8a, 8b, 8c, 8d) a first hour digit from a first series of hour digits 0 to n-1 arranged in successive order, said first display element (8) being arranged to be at least rotationally mobile around its central longitudinal axis (A), - a second display element (10), preferably not 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 or 24 hours by adding the first hour digit of the first series displayed by the first display element (8) to the second hour digit of the second series displayed by the second display element (10), said second display element (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) about its longitudinal central axis (A) by 1 / n of a turn per hour so as to display, at each change of hour, a new lateral face (8a, 8b, 8c, 8d) bearing the next first 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 next second hour digit of the second series once every n 1 / n turns of the first display member (8) about its longitudinal central axis (A).

2. A display device according to claim 1, characterized in that the first drive mechanism (14) comprises a frame (15) carrying the first display element (8) and an indexing wheel (16) kinematically linked to the first display element and comprising n regularly spaced arms (18), 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 hour change, said indexing wheel (16) having a protrusion (22) arranged to rotate an hour wheel (24) once every n 1 / n revolutions of the first display element (8), said hour wheel (24) being kinematically linked to the second display element (10) so that said second display element (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) in a periodic movement of one hour and to enable the first drive mechanism (14) 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) includes 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 protrusion (22) of the indexing wheel (16) when the chassis (15) is returned instantaneously to its initial position (PI).

6. A display device according to any one of claims 4 and 5, characterized in that the control finger (20) is arranged so as to be 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) at each passage of the chassis (15) in front of said control finger (20) when said chassis (15) is returned instantaneously to its initial position.

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

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

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

10. Display device according to any one of claims 2 to 9, characterized in that the first display member (8) is mounted free-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) kinematically 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 to 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 turn when the indexing wheel (16) rotates by 1 / n turn.

12. Display device according to any 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 rotating mounted disc bearing the numbers 0, 4 and 8.

13. Display device according to any 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 side face (8a, 8b, 8c, 8d) displayed by 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) and the first display member (8) along the graduated minute scale (48) to indicate the minutes. 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 movement in one-hour cycles. Timepiece comprising a display device (1) according to any one of claims 1 to 15.

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