Abstract: A pipetting system including a positive displacement sampling pipette as well as a capillary-piston assembly, the piston of which has a top end intended to be held by a gripping device equipping the pipette, the device including a plurality of gripping tongs. The system is designed so that, when the capillary is fitted on the pipette tip and the gripping device is remote from the piston upwards, this device can be displaced downwards with its tongs in an open configuration, up to a determined position in which the tongs, arranged around the top end of the piston, automatically switch into a closed configuration in which they provide a holding of the top end of the piston.

Abstract: A bottom part of a positive-displacement pipetting system), including a body slideably housing a device for gripping a piston belonging to a capillary-piston assembly the capillary of which is adapted to be fitted onto an end-fitting of the body. The system also comprises means for ejecting the capillary-piston assembly arranged externally with respect to the body. The system is constructed so that a relative rotation between the ejection means and the gripping device causes it to pass from an open configuration enabling the piston to be released to a closed configuration enabling said piston to be retained, and/or the reverse.

Abstract: A pipetting system including a positive displacement sampling pipette as well as a capillary-piston assembly, the piston of which has a top end intended to be held by a gripping device equipping the pipette, the device including a plurality of gripping tongs. The system is designed so that, when the capillary is fitted on the pipette tip and the gripping device is remote from the piston upwards, this device can be displaced downwards with its tongs in an open configuration, up to a determined position in which the tongs, arranged around the top end of the piston, automatically switch into a closed configuration in which they provide a holding of the top end of the piston.

Abstract: A bottom part of a positive-displacement pipetting system), including a body slideably housing a device for gripping a piston belonging to a capillary-piston assembly the capillary of which is adapted to be fitted onto an end-fitting of the body. The system also comprises means for ejecting the capillary-piston assembly arranged externally with respect to the body. The system is constructed so that a relative rotation between the ejection means and the gripping device causes it to pass from an open configuration enabling the piston to be released to a closed configuration enabling said piston to be retained, and/or the reverse.

Abstract: This invention relates to a light guide (1) for a control knob, particularly an instrument panel of a vehicle. The knob is fitted with an index (3) free to move in rotation about an axis (A). The light guide (1) will be inserted between a light source (2) and the index (3) and comprises at least one entry surface (4) for light rays emitted by the light source (2), a first exit surface (6) of light rays towards the index (3) and side faces (5) inserted between the entry surface (4) and the first exit surface (6). The light guide comprises first optical means (4, 8, 15, 16) to orient received light rays approximately parallel to the rotation axis (A) of the index (3), and second optical means (5, 22, 14, 17, 18, 19, 20) to focus the previously reoriented light rays towards at least the first exit surface (6).

Abstract: This invention relates to a light guide (1) for a control knob, particularly an instrument panel of a vehicle. The knob is fitted with an index (3) free to move in rotation about an axis (A). The light guide (1) will be inserted between a light source (2) and the index (3) and comprises at least one entry surface (4) for light rays emitted by the light source (2), a first exit surface (6) of light rays towards the index (3) and side faces (5) inserted between the entry surface (4) and the first exit surface (6). The light guide comprises first optical means (4, 8, 15, 16) to orient received light rays approximately parallel to the rotation axis (A) of the index (3), and second optical means (5, 22, 14, 17, 18, 19, 20) to focus the previously reoriented light rays towards at least the first exit surface (6).