A rotary wheel set system of a horological movement with a rotary wheel set, a first and a second bearing, for a first and a second pivot of the arbor of the rotary wheel set, the wheel set including a mass center in a position of its arbor, the first bearing including an endstone including a main body equipped with a pyramidal cavity configured to receive the first pivot of the arbor of the rotary wheel set, the cavity having at least three faces giving its pyramidal shape, the first pivot being capable of cooperating with the cavity of the endstone to rotate in the cavity, at least one contact zone between the first pivot and a face being generated, the normal at the contact zone or zones forming a contact angle (α.sub.h) relating to the plane perpendicular to the arbor of the pivot, wherein the contact angle (α.sub.h) is less than 45°.

A rotary wheel set system of a horological movement with a rotary wheel set, a first and a second bearing, for a first and a second pivot of the arbor of the rotary wheel set, the wheel set including a mass center in a position of its arbor, the first bearing including an endstone including a main body equipped with a pyramidal cavity configured to receive the first pivot of the arbor of the rotary wheel set, the cavity having at least three faces giving its pyramidal shape, the first pivot being capable of cooperating with the cavity of the endstone to rotate in the cavity, at least one contact zone between the first pivot and a face being generated, the normal at the contact zone or zones forming a contact angle (α.sub.h) relating to the plane perpendicular to the arbor of the pivot, wherein the contact angle (α.sub.h) is less than 45°.

The device (3) for testing a timepiece shaft (1) having at least one first pivot (10, 10′) and an axis of rotation (A1), the device including a rest (2) having two supports (12, 12′) intended to accommodate the timepiece shaft (1), at least one of the two supports (12) being intended to accommodate the at least one first pivot (10), an element (4; 4′) for applying a mechanical force to the timepiece shaft, positioned such that this force is at least partially taken up by the support (12) at the at least one first pivot (10). The element (4; 4′) for applying a mechanical force is arranged such that the timepiece shaft (1) is driven in rotation by a relative movement of the element (4; 4′) for applying a mechanical force and the rest (2).

The device (3) for testing a timepiece shaft (1) having at least one first pivot (10, 10′) and an axis of rotation (A1), the device including a rest (2) having two supports (12, 12′) intended to accommodate the timepiece shaft (1), at least one of the two supports (12) being intended to accommodate the at least one first pivot (10), an element (4; 4′) for applying a mechanical force to the timepiece shaft, positioned such that this force is at least partially taken up by the support (12) at the at least one first pivot (10). The element (4; 4′) for applying a mechanical force is arranged such that the timepiece shaft (1) is driven in rotation by a relative movement of the element (4; 4′) for applying a mechanical force and the rest (2).

A method for manufacturing a hole jewel, including forming a precursor from a mixture of at least one powder material with a binder; pressing the precursor, with upper lower dies, to form a green body of the future hole jewel including a blind cavity having a height between a height of the green body and a height of the future hole jewel, the cavity being provided with upper and lower portions respectively including blanks of a through hole and of a functional element of the future hole jewel; sintering the green body to form a body of the future hole jewel; machining the body, including a first sub-step of shaping a top of the body, during which a height of the upper portion is configured in readiness for an opening in the through hole blank for connecting the functional element to the upper surface, and a second sub-step of shaping a base of the body to form a lower surface of the hole jewel for connecting the functional element to to the lower surface.

A method for manufacturing a hole jewel, including forming a precursor from a mixture of at least one powder material with a binder; pressing the precursor, with upper lower dies, to form a green body of the future hole jewel including a blind cavity having a height between a height of the green body and a height of the future hole jewel, the cavity being provided with upper and lower portions respectively including blanks of a through hole and of a functional element of the future hole jewel; sintering the green body to form a body of the future hole jewel; machining the body, including a first sub-step of shaping a top of the body, during which a height of the upper portion is configured in readiness for an opening in the through hole blank for connecting the functional element to the upper surface, and a second sub-step of shaping a base of the body to form a lower surface of the hole jewel for connecting the functional element to to the lower surface.

Method of assembly of a watch pivot device (100) or a watch mechanism (200) or a watch movement (300) or a timepiece (400), the watch pivot device (100) or the watch mechanism (200) or the watch movement (300) or the timepiece (400) comprising a pivot (1) and a bearing (2), the method comprising the following stages: (i) supplying the pivot (1); (ii) supplying the bearing (2); (iii) applying, to at least one surface (101, 102, 211, 221) of the pivot and/or of the bearing, a lubricant of which the kinematic viscosity at a temperature of 20° C. is greater than 1.5 St; and (iv) positioning the pivot in the bearing.

Method of assembly of a watch pivot device (100) or a watch mechanism (200) or a watch movement (300) or a timepiece (400), the watch pivot device (100) or the watch mechanism (200) or the watch movement (300) or the timepiece (400) comprising a pivot (1) and a bearing (2), the method comprising the following stages: (i) supplying the pivot (1); (ii) supplying the bearing (2); (iii) applying, to at least one surface (101, 102, 211, 221) of the pivot and/or of the bearing, a lubricant of which the kinematic viscosity at a temperature of 20° C. is greater than 1.5 St; and (iv) positioning the pivot in the bearing.

A watch movement includes a frame having a first bearing and a second bearing, and a tourbillon including two cages, of which one cage is known as the external cage. The external cage is mounted in a pivoting manner on the frame between the first bearing and the second bearing. The movement also includes two watch jewels supporting two pivots of the external cage. Additionally, the movement includes two translational elements capable of displacement in relation to the bearings in the axis of rotation of the external cage in the assembled position of the external cage on the frame, so as to cause a displacement of the watch jewels or a displacement of the pivots.

A watch movement includes a frame having a first bearing and a second bearing, and a tourbillon including two cages, of which one cage is known as the external cage. The external cage is mounted in a pivoting manner on the frame between the first bearing and the second bearing. The movement also includes two watch jewels supporting two pivots of the external cage. Additionally, the movement includes two translational elements capable of displacement in relation to the bearings in the axis of rotation of the external cage in the assembled position of the external cage on the frame, so as to cause a displacement of the watch jewels or a displacement of the pivots.