Device for the translational driving of a piston for the distrib

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222405, 401176, B67D 542

Patent

active

059927054

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The present invention has essentially as its subject an improved device for the relative translational driving of a part forming a piston in a body.
It is also directed to an apparatus applying a more or less viscous fluid such for example as nail varnish or a cosmetic deodorant gel fitted with this device.


BACKGROUND OF THE INVENTION

One has described in the French patent No 9212885 belonging to the applicant and published under No 2,697,311 a device for the translatory driving of a part forming a piston in a body by the rotation of a rod extending through the said part which is held against rotary motion in the body.
More precisely, the piston-like part was provided with one or several blades the cutting edge of which was inclined with respect to the longitudinal axis of the rod and which projected sidewise through the opening of the piston-like part extended through by the rod for being caused to bite into the external smooth periphery of this rod so as to incise it helically during its rotation and to thus cause the translational motion of the part forming a piston along the rod during this rotation.
Now it has been found that the fitting of the blade or blades into the small hole of the part forming a piston and through which the rod extends was tricky and sometimes even difficult.
Moreover the part forming a piston had to be made fast in rotation to the body by joints and the making fast in rotation of these two elements sometimes was difficult to be obtained more especially as the piston displacing itself axially in the body was necessarily subjected to a torque resulting from the blade or blades biting into the rod extending centrally through the part forming a piston.


SUMMARY OF THE INVENTION

The present invention has in particular as its object to solve these problems by proposing an improved driving device permitting an easy setting in of the blades and removing the problems of the holding against rotation of the part forming a piston during its axial translation in the body.
For that purpose the invention has as its subject a device for the relative translatory driving of a part forming a piston in a body through the medium of at least one blade the cutting edge of which is inclined with respect to the longitudinal axis of the part or body, characterized in that the said blade is either made fast to the external wall of the part forming a piston to be caused to bite into the internal wall of the body or made fast to the internal wall of the body for being caused to bite into the external wall of the part forming a piston in order that the rotation of the part forming a piston with respect to the body or the reverse causes the displacement of the said part within the body.
One already understands that the setting in of the blades onto the external wall of the piston or onto the internal wall of the body in which the said piston is moving in translation will be much easier and that the problem of the holding against rotation of the piston with respect to the body is no longer raised.
According to another characteristic, the device of the invention comprises a rod made fast in rotation to the part forming a piston.
This rod is fastened onto the piston or made in one piece through molding with the latter.
According to another embodiment, the rod consists of at least one element with a non circular cross-section extending in fluid-tight relationship through an aperture with a corresponding cross-section formed in the piston so as to ensure the connection for unitary rotation of the rod and of the piston.
According to another embodiment, the aforesaid rod consists of a plurality of telescopic elements connected to the piston.
One should further specify here that in both embodiments set forth previously, that end of the rod which is opposite to that co-operating with the piston is mounted in freely rotatable relationship onto one end of the body containing the piston.
In the case where the rod exhibits a non circular cross-section extending in fluid-tight relationship thr

REFERENCES:
patent: 1701663 (1929-02-01), Clark
patent: 5863142 (1999-01-01), Lhuisset et al.
Derwent WPI Acc No. 94-160923/199420, English language abstract of France 2 697 311 and WO 94/10481.

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