Expansible chamber devices – Cylinder detail – With reinforcing member
Reexamination Certificate
1999-05-11
2001-02-13
Ryznic, John E. (Department: 3745)
Expansible chamber devices
Cylinder detail
With reinforcing member
Reexamination Certificate
active
06186050
ABSTRACT:
The present invention relates to a braking device for a motor vehicle comprising an attachment support and a pneumatic brake-booster fixed when operational to the support, the booster itself comprising a rigid casing at least made of a front shell and of a rear shell which is adjacent to the support when operational, this casing being reinforced by at least one strut and delimiting an internal volume in which two chambers are separated from one another by means of a moving partition, the strut passing through the front shell, the moving partition and the rear shell and comprising a screw of which a rear end has a screw thread that can be screwed into the support, and of which a front end, which is outside the front shell, forms a tightening head capable of pressing against the front shell.
BACKGROUND OF THE INVENTION
Devices of this type are known from the prior art as illustrated, for example, by patent document EP-0,119,880.
In spite of its attraction, the embodiment illustrated in this prior document entails, so that the screw of the strut can be guided, the use of a tube which itself also forms an integral part of the strut.
SUMMARY OF THE INVENTION
The invention falls within this context and is intended to obviate this constraint.
To this end, the device of the invention, which in other respects is in accordance with the definition given in the above preamble, is essentially characterized in that the screw itself passes directly through the front shell, the moving partition and the rear shell and has, between its two ends an essentially cylindrical intermediate section, in that this intermediate section has a first stop which is inside the front shell and distant from the tightening head, in that the rear shell has a sleeve in which the rear end of the screw is engaged and can slide freely, in that the sleeve is of such a length that it can prevent the rear end of the screw from coming out of this sleeve, and in that the first stop is placed, along the intermediate section of the screw, in a position that allows the screw thread not to project from the sleeve until the booster is fixed to the support.
The intermediate section of the screw advantageously has a second stop intended to press against a front face of the sleeve when the screw is screwed into the support, the tightening head then coming to press against the front shell against which it exerts a predetermined compressive stress.
The device of the invention preferably further comprises a first seal for sealing the penetration through the front shell by the screw between the tightening head and the first stop, and a second seal for sealing the penetration through the sleeve by the screw between the second stop and the screw thread.
If the moving partition comprises a flexible diaphragm, this diaphragm may, for example, form a bellows surrounding part of the intermediate section of the screw and ending in a lip pressing in a sealed manner against this intermediate section.
Other features and advantages of the invention will emerge clearly from the description thereof given hereafter by way of non-limiting indication, with reference to the appended drawings.
REFERENCES:
patent: 4328738 (1982-05-01), Hamamatsu
patent: 4402256 (1983-09-01), Ando
patent: 4418611 (1983-12-01), Tateoka et al.
patent: 4617858 (1986-10-01), Hachiro
patent: 4690034 (1987-09-01), Ando et al.
patent: 5410880 (1995-05-01), Schluter
patent: 5447030 (1995-09-01), Wang et al.
patent: 5878650 (1999-03-01), Osterday et al.
Leboisne Cedric
Verbo Ulysse
Bosch Systemes de Freinage
Comstock Warren
McCormick Jr. Leo H.
Ryznic John E.
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