Abstract: A device for a multi-channel pipetting system, comprising a piston holder, a guide rod of the piston holder, which guide rod is mounted slidably in a guide member, a plurality of pistons having a bottom end housed slidably in a suction chamber, and a piston head mounted on the piston holder by way of a mechanical connection. The mechanical connection comprises two contact points which conjointly define a piston-head rotation axis oriented orthogonally with respect to the transverse direction and to the longitudinal central axis of the pipetting system, and the device additionally comprises, associated with the piston, return spring which force the piston head upward against the piston holder, so as to establish the two contact points.

Abstract: A pipette for sampling an extended range of volumes of liquid includes a fixed pipette body. An operating rod is movable in translation relative to the pipette body, along a longitudinal axis of the pipette. The pipette includes a suction chamber and a set of N concentric pistons, wherein N corresponds to an integer greater than or equal to 2. Each of the pistons contributes to delimiting the suction chamber. A coupling module couples the operating rod with the set of N concentric pistons. The module is configured in such a way as to be able to be brought into N distinct configurations in which it respectively couples the operating rod with 1, 2, . . . , N pistons.

Abstract: In order to improve the ergonomics of a sampling pipette, the invention provides a control member intended to occupy a nominal central position in which a spring brings a locking member into the locking position thereof of the system for adjustment of the volume to be sampled, the member being able to be axially displaced towards each of the two following positions: a low position for ejecting a cone, in which the control member presses on the cone ejector, the movement from the nominal central position to the low position being carried out against the springs; and a high position for unlocking the braking ring, the movement of the control member from the nominal central position to the high position driving a disengagement element to move the locking member against the spring, until release of the braking ring.

Abstract: In order to extend the operating range of a withdrawing pipette, the invention provides: —a fixed pipette body; —an operating rod movable in translation relative to the pipette body, along a longitudinal axis of the pipette; —a suction chamber; —a set of N concentric pistons, N corresponding to an integer greater than or equal to 2, each of the pistons contributing to delimiting the suction chamber; and —a coupling module coupling the operating rod with the set of N concentric pistons, the module being configured in such a way as to be able to be brought into N distinct configurations in which it respectively couples the operating rod with 1, 2, . . . , N pistons.

Abstract: In order to improve the ergonomics of a sampling pipette, the invention provides a control member intended to occupy a nominal central position in which a spring brings a locking member into the locking position thereof of the system for adjustment of the volume to be sampled, the member being able to be axially displaced towards each of the two following positions: a low position for ejecting a cone, in which the control member presses on the cone ejector, the movement from the nominal central position to the low position being carried out against the springs; and a high position for unlocking the braking ring, the movement of the control member from the nominal central position to the high position driving a disengagement element to move the locking member against the spring, until release of the braking ring.

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).