A mechanical watch or measurement instrument including metallic parts, wherein each part of the mechanical watch mechanism has a relative magnetic permeability of less than 1.01.

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 timepiece movement includes two timepiece components rotating about a common axis, namely a first timepiece component attached to an arbor including a pivot (1) at least at one of its extremities and a second timepiece component including a bearing (2) receiving said pivot (1). The pivot (1) and the bearing (2) have the form of a rounded regular polygon, preferably a rounded equilateral triangle, respectively male or female, arranged in such a manner that the pivot (1) engages in the bearing (2) with an angular clearance permitting rotation of the arbor to be transmitted to the second component by a self-locking effect.

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).

Elementary timepiece mechanism comprising a first housing about an axis, a second housing, and a mobile element comprising a first shoulder pivoting in the first housing and a second shoulder pivoting in the second housing, the second housing comprising at least a first abutment surface arranged to ensure the alignment of the mobile element on said axis when the mobile element is in abutment on the first abutment surface, and the elementary mechanism includes at least one elastic return means arranged to return the mobile element to this first abutment surface.

Elementary timepiece mechanism comprising a first housing about an axis, a second housing, and a mobile element comprising a first shoulder pivoting in the first housing and a second shoulder pivoting in the second housing, the second housing comprising at least a first abutment surface arranged to ensure the alignment of the mobile element on said axis when the mobile element is in abutment on the first abutment surface, and the elementary mechanism includes at least one elastic return means arranged to return the mobile element to this first abutment surface.

The invention provides bearing systems characterized by single point contact with each jewel segment and a spring-loaded assembly with protection from radial and thrust forces. An important feature of jewel bearings of the invention is that they are self-lubricating, i.e., no oil or grease lubricants are needed. This can be a major advantage in medical and precision equipment. A secondary important feature is the reduced friction and effective heat-dissipation due to the unique design of the invention with significant reduction in contact surfaces and friction, which significantly prolong the lifespan of the bearings. Another advantage of the present invention is the substantial reduction in audible noise due to the unique design. Furthermore, the invention allows the use of relatively low cost synthetic jewel segments in bearings.

The invention provides bearing systems characterized by single point contact with each jewel segment and a spring-loaded assembly with protection from radial and thrust forces. An important feature of jewel bearings of the invention is that they are self-lubricating, i.e., no oil or grease lubricants are needed. This can be a major advantage in medical and precision equipment. A secondary important feature is the reduced friction and effective heat-dissipation due to the unique design of the invention with significant reduction in contact surfaces and friction, which significantly prolong the lifespan of the bearings. Another advantage of the present invention is the substantial reduction in audible noise due to the unique design. Furthermore, the invention allows the use of relatively low cost synthetic jewel segments in bearings.