Containers for pressurized fluids, in particular for dispensing aerosols

A container for pressurized fluid, comprising an envelope delimiting the space for the fluid and said envelope having an axis and including a movable wall designed to move automatically along said axis so as to reduce the volume of the space as the contents become exhausted, pressure means for exerting a positive pressure on said movable wall to continuously urge a reduction of the space, said pressure means including a vacuum chamber disposed so as to create a vacuum operable on at least a part of said movable wall, the space for the pressurized fluid and the vacuum chamber being disposed on opposite sides of the movable wall, said pressure means include resilient means separate and apart from said wall exerting on the wall a force opposed to that exerted on the latter by the pressurized fluid, means for introducing air into the vacuum chamber, so as to compensate for the reduction by release of the force exerted on the movable wall by the resilient means, and the entry of air into the vacuum chamber is controlled by a valve held in closing position by the pressure prevailing in the space for the fluid.

A container for pressurized fluid, comprising an envelope delimiting the space for the fluid and said envelope having an axis and including a movable wall designed to move automatically along said axid so as to reduce the volume of the space as the contents become exhausted, pressure means for exerting a positive pressure on said movable wall to continuously urge a reduction of the space, said pressure means including a vacuum chamber disposed so as to create a vacuum operable on at least a part of said movable wall, the space for pressurizing fluid and the vacuum chamber being disposed on opposite sides of the movable wall, said pressure means including resilient means separate and apart from said wall exerting on the wall a force opposed to that exerted on the latter by the pressurized fluid, and the vacuum chamber is annular shaped and acts as a housing for the resilient means formed by a coil spring.

A container for pressurized fluid, comprising an envelope delimiting the space for the fluid and said envelope having an axis and including a movable wall designed to move automatically along said axis so as to reduce the volume of the space as the contents become exhausted, pressure means for exerting a positive pressure on said movable wall to continuously urge a reduction of the space, said pressure means including a vacuum chamber disposed so as to create a vacuum operable on at least a part of said movable wall, the space for the pressurized fluid and the vacuum chamber being disposed on opposite sides of the movable wall, said pressure means including resilient means separate and apart from said wall exerting on the wall a force opposed to that exerted on the latter by the pressurized fluid, the envelope being a cylindrical envelope having a sealing wall at both ends, the movable wall being slidably mounted in the cylindrical envelope between the sealing walls, the space for the fluid and the vacuum chamber being formed inside the envelope, on opposite sides of the movable wall, and fluid-tight sealing between the space for the fluid and the vacuum chamber is achieved by a flexible sheath fixed by its two respective ends to the movable wall and to one of the sealing walls.

A container for pressurized fluid, comprising an envelope delimiting the space for the fluid and said envelope having an axis and including a movable wall designed to move automatically along said axis so as to reduce the volume of the space as the contents become exhausted, pressure means for exerting a positive pressure on said movable wall to continuously urge a reduction of the space, said pressure means including a vacuum chamber disposed so as to create a vacuum operable on at least a part of said movable wall, the space for the fluid and the vacuum chamber are situated on the same side of the movable wall, a flexible wall able to extend and contract along the axis of movement of the movable wall and ensuring the separation between the space for the fluid and the vacuum chamber, the ability of the flexible wall to extend and contract is afforded by its flexibility, and the movable wall is slidably mounted in the manner of a piston in a cylindrical envelope sealed by a cover at one end, the flexible wall being a sheath in the form of a bellows fixed by its two respective ends to the cover and to the piston to delimit an internal space, surrounded by an annular space, usable as desired one as the space for the fluid, the other as the vacuum chamber.

A container for pressurized fluid, comprising an envelope delimiting a space for the fluid and having a wall designed to move automatically so as to reduce the volume of the space as the contents become exhausted, wherein a vacuum chamber is disposed so as to create a vacuum on at least a part of said wall, the movable wall has a first surface and a second surface which are exposed respectively to the fluid and to a vacuum, and having the same orientation relative to the axis of movement of the movable wall, a casing comprising an outer sleeve and two transverse walls, and wherein the movable wall is a hollow body formed of an inner sleeve sliding in the outer sleeve and of two transverse walls situated one on each side of a transverse wall of the casing, which forms a partition therein, an annular space being left between the periphery of the transverse partition and the inner surface of the outer sleeve, the transverse walls of the hollow body forming with respective transverse walls of the casing two chambers, the volume of which is variable simultaneously in the same sense through the displacement of the hollow body, one of these chambers being for the pressurized fluid and the other being the vacuum chamber.

A process for packing pressurized fluid into a container of the type comprising a chamber for pressurized fluid and a chamber for holding vacuum therein, having at least two components mounted mobile relative to each other along an axis of movement to change the volumes of said chambers, wherein each of said chambers has two axially spaced primary and secondary wall means, said two chambers being formed respectively by said two primary and said two secondary wall means, wherein the primary and secondary wall means of one of said chambers are connected by a tie located at least in part in one of said chambers, said process comprising the steps of giving the wall means the position corresponding to minimum volume for both chambers, and filling one of the chambers with pressurized fluid and thus automatically creating a vacuum in the other of the chambers.

A process for packing fluid in a container for pressurized fluid comprising an envelope delimiting a space for the fluid and having a wall designed to move automatically so as to reduce the volume of the space as the contents become exhausted, wherein a vacuum chamber is disposed so as to create a vacuum on at least a part of said wall, said process comprising the steps of giving the movable wall the position corresponding to the minimum volume for both the fluid space and the vacuum chamber, and introducing pressurized fluid into the fluid space and thus automatically creating a vacuum in the vacuum chamber.

A container for distributing pressurized flowable material, said container comprising a first chamber for receiving the material, provided with a valve-controlled outlet and a first mobile wall portion, and a variable volume self-contained vacuum second chamber for holding vacuum provided with a second mobile wall portion having two opposite faces which are exposed one to sub-stmospheric pressure from the vacuum chamber and the other to at least atmospheric pressure, with means linking said mobile wall portions together for simultaneous movement so as to cause simultaneous variations of the same sign in the volumes of both chambers, whereby the combined effect of said sub-atmospherica pressure and at least atmospheric pressure on said second wall portion is operative through the agency of said first wall portion in permanently pressurizing material in the first chamber and causing a quantity thereof to be ejected from said first chamber when said valve-controlled outlet is open, each such ejection causing simultaneous reductions in volume in both first and second chambers, with the material left in the first chamber after each such ejection remaining pressurized.

A process for packing pressurized flowable material into a container of the type comprising a first chamber for receiving the material and provided with a valve-controlled outlet and a first mobile wall portion and a second chamber for holding vacuum provided with a second mobile wall portion having two opposite faces which are exposed one to the second chamber and the other to at least atmospheric pressure, with means linking said mobile wall portions together for simultaneous movement between one position of minimum volume of both chambers and another position of maximum volume of both chambers, said process consisting in giving both mobile wall portions the position corresponding to minimum volume for both chambers and filling the first chamber with pressurized flowable material thereby automatically creating a vacuum in the second chamber.

A process for packing pressurized flowable material into a container of the type comprising a first chamber for receiving the material and provided with a valve-controlled outlet and a first mobile wall portion and a second chamber for holding vacuum provided with a second mobile wall portion having two opposite faces which are exposed one to the second chamber and the other to at least atmospheric pressure, with means linking said mobile wall portions together for simultaneous movement between one position of minimum volume of both chambers and another position of maximum volume of both chambers, said process consisting in applying to the mobile wall portions a force sufficient to distend the vacuum chamber by overcoming the at least atmospheric pressure acting on the second mobile wall portion, thereby simultaneously distending the first chamber, filling the first chamber with flowable material, and releasing said force whereby said material becomes pressurized.