Patent Application Titled "Centrifuge Integrating Tachometric Device Mounted in an Upper Part of the Chamber, Especially Mounted on the Lid" Published Online
The assignee for this patent application, patent application serial number 508287, is
Reporters obtained the following quote from the background information supplied by the inventors: "Classically, the centrifuge comprises: a drive shaft, a rotor designed to be mounted removably on the drive shaft in a mounting position for which the drive shaft and the rotor are coupled in rotation, a device for the axial locking of the rotor on the drive shaft, comprising a male element carried by the rotor, elastically stressed and capable of occupying a position of cooperation with a female element presented by the drive shaft.
"Classically, centrifuges comprise a chamber including a vessel in which there is placed the rotor constituting the rotating element of the centrifuge.
"Furthermore, a lid is mounted pivotally on the chamber about an axis extending towards the rear part of the lid, this lid being capable of pivoting between an open position giving access to the interior of the vessel and a closed position in which it hermetically closes the vessel.
"In the closed position, the lid is maintained by locking means designed to hold the lid in the closed position throughout the centrifugation cycle.
"Classically too, centrifuges incorporate tachometric means used to obtain the rotation speed of the rotating element constituted by the rotor. These pieces of data on rotation are essential to the working of the centrifuge, to achieve automatic feedback control over the rotation speed of the motor means as a function of the desired centrifugation cycle.
"Referring to FIG. 1, a traditional technique used to obtain the rotation speed of the rotor consists in integrating tachometric means, generally constituted by an optical tachometer, at the bottom of the chamber of the centrifuge. In this technique, the disk D is fixedly joined in rotation to the motor of the centrifuge, this disk having a target reference and an optical reading means L capable of detecting the frequency of passage of the target reference so as to deduce therefrom a speed of rotation of the disk, enabling a subsequent check on the speed of rotation of the motor and indirectly, that of the rotating element.
"This classic prior-art technique implies several drawbacks.
"First of all, it is clearly necessary to provide for a space in the chamber of the centrifuge to integrate the tachometric means. Now this space, in practice, represents a non-negligible height which has an impact on the total height of the chamber and, therefore, that of the centrifuge.
"However it is necessary, as far as possible, to restrict the height of a centrifuge. Indeed, centrifuges are most usually installed on desk tops of standard height and accessing the interior of the vessel of the centrifuge, in order to place samples in the vessel and remove these same samples from it, is done through the upper part of the centrifuge, after the opening of the lid. It can therefore be understood that the height of the centrifuge must be taken into account to enable an operator of average height to perform this handling operation with a certain degree of ease.
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