US 4,284,293 AGranted

Adjustable stand

AssigneeDelmer M. Stamness

InventorIzydor Rygajlo

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Abstract

An adjustable stand comprising a hollow cylindrical reservoir (11) mounted on a base (12), a hollow cylindrical piston (10) slidable in the reservoir to define therewith a chamber (16) of variable volume, a closure disk (20) at one end of the piston to divide the chamber into first and second portions, and having an aperture (23) to provide passage between the portions, a load supporting cap (13) at the other end of the piston, a charge in the chamber of particulate loose material capable of granular flow through the passage, the disk being configured to facilitate the flow in one direction and impede the flow in the other direction, an agitator (27) in the piston and cylinder and extending through the aperture for enabling load responsive flow of the material through the passage in the other direction, and a mechanical connection (34, 36) for enabling operation of the agitator from outside the chamber.

Claims9

Dependent claims

Adjustable stand apparatus in combination:

a hollow cylindrical reservoir having an axis extending between a first, closed end and a second, open end thereof;
a hollow cylindrical piston having a first end received in said reservoir and a second end extending axially therefrom, said piston being slidable axially in said reservoir so that said piston and said reservoir jointly define a chamber of variable volume;
closure means for said first end of said piston, having an aperture therein to divide said chamber into first and second portions and to provide a passage between said portions;
a charge in said chamber of particulate load supporting material capable of granular flow through said passage, said closure means being configured to facilitate the gravity-responsive flow of said material in a first direction, from said piston to said reservoir, but to inhibit load-responsive flow of said material in a second direction, from said reservoir to said piston;
agitator means carried in said piston and extending through said aperture and operable to enable load responsive flow of said material through said passage in said second direction;
and
means for manually causing actuation of said agitator means.

4 more elements

An adjustable supporting stand comprising, in combination:

a hollow cylindrical reservoir having an axis extending between a first, closed end and a second, open end thereof;
a base member at said first end of said reservoir for supporting said reservoir with said axis vertical;
a hollow cylindrical piston having a first end received in said reservoir and a second end extending axially therefrom, said piston being slidable axially in said reservoir so that said piston and said reservoir jointly define a chamber of variable volume;
a support cap mounted on said second end of said piston;
closure means for said first end of said piston, having an aperture therein to divide said chamber into first and second portions and to provide a passage between said portions;
a charge in said chamber of particulate load supporting material capable of granular flow through said passage, said closure means being configured to facilitate the gravity-responsive flow of said material in a first direction, from said piston to said reservoir, but to inhibit load-responsive flow of said material in a second direction, from said reservoir to said piston;
agitator means carried in said piston and extending through said aperture and operable to enable load responsive flow of said material through said passage in said second direction;
and
means for manually causing actuation of said agitator means.

6 more elements

Dependencies are inferred from the claim text.