Supports – Stand – Standard type
Patent
1989-11-17
1991-03-05
Ramirez, Ramon O.
Supports
Stand
Standard type
248631, 267 6412, F16M 1100
Patent
active
049971506
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns an adjustable oleopneumatic support, particularly fit for chairs with central column.
In chairs with a central column an adjustable, gas shock-absorber supports are commonly used. Such support are generally placed in a vertical position inside a guiding telescope cladding, with the ends respectively, connected to the base and the seat of the chair, and support the load applied in a spring fashion.
Such well known gas shock-absorbers are mainly constituted of a piston which, upon application of the load, compresses the gas stored in side until its pressure balances the action of the load; in such condition of equilibrium, the same pressure acting on the piston, is reached by the gas, thereby supporting the chair and the load applied on it.
The height adjustment of the seat can be effected by opening, with predisposed valvular means, an inner passage which connects the chamber in which the piston slides to an adjacent compressed gas chamber.
In the absence of a load, the opening of the passage causes the gas to exit from said chamber and, upon expanding the gas lifts the piston; vice versa, by application of a sufficiently heavy load, contemporaneous reverse opening condition occurs which causes the lowering of the piston and the passage of a further quantity of gas into said chamber with the raising of the pressure in its interior. Such were known gas shock-absorbers, though revealing themselves valid from an exclusively pratical point of view, are not free from inconveniences, principal among which is the fact that the gas compressed in the shock absorbers reaches a very high pressure which notoriously results in serious leakage and escapage of gas and ultimate discharge of the shock absorber.
In relation to both the stress generated by the high pressure, aiming to keep within acceptable limits the thickness of the components, of the shock-absorber and to the avoidence of too high springing run, small-diameter tubular elements are generally used however, due to high load points, such small-diameter tubular elements do not possess the necessary stability and must be normally assembled in combination with complementary devices, such as guiding telescopic claddings of bigger dimensions.
An object of the present invention is to eliminate the drawbacks above mentioned in well known types of gas shock-absorbers, by providing an adjustable support in which the height adjustment occurs by fluid shifting from one chamber to the other, without compression, so as to keep low in every situation the value of the interior pressure and which, uses as operating fluid an uncompressable liquid, thereby simplifying appreciably all the problems connected with gas proofing at high pressure.
Another object of the invention is to achieve an adjustable oleopneumatic element which, for its own peculiar structural characteristics, can support with security and without buckling the full stress springing from the loads applied on the chair, so as to be used singularly, without employing complementary devices.
Still another object of the invention is to provide an oleopneumatic support with valvular means of adjustment which, besides being extremely functional and reliable, present an encumbrance extremely reduced, so as to be easily lodged inside the same supporting element, without requiring particular constructive complications.
Yet another object of the invention is to provide an adjustable oleopneumatic support which is easily constructed from elements and materials commonly available in commerce, which is rapidly assembled and which is economically competitive.
These and other objects, features and advantages of the invention are achieved by an adjustable oleopneumatic support, particularly for chairs with a central column, including a hollow cylindrical body, of with a central column, including a hollow cylindrical body, of which lower base is rigidly linkage to the base of the chair, and a coaxial stem, of which head is rigidly linkage to the seat of the same chair, in which the stem is fluently,
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Lifter S.r.l.
Ramirez Ramon O.
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