Expansible chamber devices – Bellows type expansible chamber – Superposed peripherally interconnected elements
Patent
1995-01-11
1996-10-29
Denion, Thomas E.
Expansible chamber devices
Bellows type expansible chamber
Superposed peripherally interconnected elements
92 34, 92 37, 92 48, 92 64, 92 59, 92 98R, 92128, 92151, F01B 1900
Patent
active
055687610
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a pneumatic jack comprising a body delimiting with a membrane a chamber adapted to be subjected to negative pressure or to atmospheric pressure and a jack shaft actuated by the deformation of the membrane.
BACKGROUND OF THE INVENTION
Pneumatic jacks are known for a large number of uses. Most of these jacks have a jack body and a shaft displaceable longitudinally relative to the jack body. This type of arrangement permits obtaining jacks adapted to occupy for example three working positions, one corresponding to the maximum extension of said shaft, the other corresponding to the minimum extension of said shaft and the third corresponding to an intermediate extension. In this case, the jack body comprises two membranes delimiting three chambers and the shaft is secured to the central portion of each of the membranes, which complicates the production of the assembly and limits the number of positions adapted to be occupied.
The object of the present invention is to provide a jack whose number of working positions is unlimited and which is susceptible of being produced by means of a small number of simple and standard pieces.
Another object of the invention is to provide a modular jack comprising several chambers, one chamber corresponding to a module, said modules being adapted to be mounted in series, in parallel or permitting the production of a push-pull type actuator.
SUMMARY OF THE INVENTION
The invention relates for this purpose to a pneumatic jack of the type comprising a rigid jack body secured to the external edge of a deformable membrane so as to limit with this latter a chamber of variable volume adapted to be subjected either to atmospheric pressure, or to negative pressure, by means of an air inlet provided in said chamber, characterized in that the body and the membrane each have, substantially centrally, an opening adapted to be closed at least partially by a disk.
According to one preferred embodiment of the invention, the body has the shape of a basin whose peripheral edge serves to maintain the membrane and whose surface forming a bottom comprises the opening closed at least partially by the disk. As to the disk serving to close at least partially the membrane, it is mounted on the internal edge of the membrane and is so shaped as to come into abutment against the bottom of the basin when the chamber is subjected to negative pressure.
According to another characteristic of the invention, the jack comprises several contiguous chambers obtained by the assembly of modules each comprising at least one body and one membrane, the connection between two adjacent modules being effected by a single and same disk closing at least partially both the body of a module and the membrane of the adjacent module and maintaining securely the membrane of the body.
BRIEF DESCRIPTION OF THE DRAWINGS
Other characteristics and advantages of the invention will become apparent from a reading of the description which follows and the accompanying drawings, which description and drawings are given only by way of example. In these drawings:
FIG. 1 is a schematic view in half-section of a jack according to the invention;
FIG. 2 is a schematic view in half-section of a "push-pull" type jack according to the invention;
FIG. 3 is a schematic view in half-section of a jack formed by several modules disposed in series;
FIG. 4 is a schematic view in half-section of a jack formed by several modules disposed in parallel;
FIG. 5 is a cross-sectional view of a jack comprising several modules mounted in parallel;
FIG. 6 is a view of an example of assembly of modules to produce a jack according to the invention;
FIG. 7 is a side view of means for incorporation of a pipe in said chamber.
DETAILED DESCRIPTION OF THE INVENTION
According to the invention, the jack comprises a rigid jack body 1 secured to a membrane 2, and disks 3 and 4 closing at least partially respectively the openings 15 and 14 provided in the body 1 and the membrane 2 so as to delimit a chamber adap
REFERENCES:
patent: 1141360 (1915-06-01), Rudd
patent: 2712321 (1955-07-01), Grogan
patent: 3442180 (1969-05-01), Babic
patent: 3446241 (1969-05-01), Skoli
patent: 3975989 (1976-08-01), Hirmann
patent: 5079998 (1992-01-01), Peterson et al.
Corea S.A.
Denion Thomas E.
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