Hydropneumatic impact absorptive device

Claim 2

An impact absorption device comprising: a hollow cylinder having means defining a rod opening in one end; a partition member axially slidable in said cylinder dividing same into a first compartment containing therein a liquid and a second compartment containing therein a pressurized gas continuously biasing said partition in one direction; a piston axially movable in said first compartment dividing same into a first liquid chamber and a second liquid chamber adjacent said second compartment and separated therefrom only through the intermediary of said partition member so that when said piston moves in a direction towards said partition member said liquid is immediately pressurized and effects movement of said partition member in another direction opposite said one direction and effecting an increase in pressure of said pressurized gas; means defining a passage between said first liquid chamber and said second liquid chamber for flowing therethrough said liquid and permitting said piston to move thereby reducing the pressure of said liquid in said second liquid chamber; a piston rod connected to said piston and extending through said rod opening and said first liquid chamber; and a load bearing member connected to said piston rod externally of said cylinder for transferring an impact load applied thereto to said piston rod thereby effecting movement of said piston towards said partition member and therefore pressurization of said liquid in said second liquid chamber thereby moving said partition member in said another direction to increase the pressure of said pressurized gas in said second compartment whereby when said impact load is removed from said load bearing member said pressurized gas effects sliding of said partition member in said one direction and therefore pressurization of said liquid in said second chamber and movement of said piston in a direction away from said partition member.

Claim 3

An impact absorption device comprising: a hollow cylinder having means defining a rod opening in one end; a stationary partition member disposed in said cylinder dividing same into a first compartment and a second compartment; a piston axially movable in said first compartment dividing same into a first chamber and a second chamber, said second chamber containing therein a liquid which is pressurized by said piston when it moves toward said stationary partition member; a slidable partition member slidable in said second compartment and dividing same into a first section and a second section, said first section containing therein a liquid and said second section containing therein pressurized gas continuously biasing said slidable partition member in one direction, said slidable partition member effecting pressurization of said liquid in said first section when it moves in said one direction; means defining at least one passage in said stationary partition member for flowing therethrough said liquid to enable same to flow between said second chamber and said first section thereby permitting said piston to move towards said stationary partition member when the liquid pressure in said second chamber is greater than the liquid pressure in said first section thereby effecting movement of said slidable partition member in another direction opposite said one direction and increasing the pressure of said pressurized gas and permitting said slidable partition member to slide in said one direction with the liquid pressure in said first section is greater than the liquid pressure in said second chamber thereby effecting movement of said piston away from said stationary partition member; a piston rod connected to said piston and extending through said rod opening and said first chamber; and a load bearing member connected to said piston rod externally of said cylinder for transferring an impact load applied thereto to said piston rod thereby effecting movement of said piston towards said stationary partition member accompanied by the development of a vacuum in said first chamber and therefore pressurization of said liquid in said second chamber thereby increasing the pressure of said liquid in said first section and moving said slidable partition in said another direction to increase the pressure of said pressurized gas in said second section whereby when said impact load is removed from said load bearing member said pressurized gas effects sliding of said slidable partition member in said one direction and therefore pressurization of said liquid in said first section and said second chamber and movement of said piston assisted by the vacuum in said first chamber in a direction away from said stationary partition member.

Claim 4

An impact absorption device comprising: a hollow cylinder having means defining a rod opening in one end; a stationary partition member disposed in said cylinder dividing same into a first compartment and a second compartment; a piston axially movable in said first compartment dividing same into a first chamber and a second chamber, said second chamber containing therein a liquid which is pressurized by said piston when it moves toward said stationary partition member; a slidable partition member slidable in said second compartment and dividing same into a first section and a second section, said first section containing therein a liquid and said second section containing therein pressurized gas continuously biasing said slidable partition member in one direction, said slidable partition member effecting pressurization of said liquid in said first section when it moves in said one direction; means defining at least one passage in said stationary partition member for flowing therethrough said liquid to enable same to flow between said second chamber and said first section thereby permitting said piston to move towards said stationary partition member when the liquid pressure in said second chamber is greater than the liquid pressure in said first section thereby effecting movement of said slidable partition member in another direction opposite said one direction and increasing the pressure of said pressurized gas and permitting said slidable partition member to slide in said one direction with the liquid pressure in said first section is greater than the liquid pressure in said second chamber thereby effecting movement of said piston away from said stationary partition member; a piston rod connected to said piston and extending through said rod opening and said first chamber; and a load bearing member connected to said piston rod externally of said cylinder for transferring an impact load applied thereto to said piston rod thereby effecting movement of said piston towards said stationary partition member accompanied by the development of a vacuum in said first chamber and therefore pressurization of said liquid in said second chamber thereby increasing the pressure of said liquid in said first section and moving said slidable partition in said another direction to increase the pressure of said pressurized gas in said second section whereby when said impact load is removed from said load bearing member said pressurized gas effects sliding of said slidable partition member in said one direction and therefore pressurization of said liquid in said first section and said second chamber and movement of said piston assisted by the vacuum in said first chamber in a direction away from said stationary partition member.

Claim 5

An impact absorption device according to claim 2; including means defining at least one additional passage in said stationary partition member and a one-way check valve for permitting liquid flow through said one additional passage when said slidable partition member moves in said another direction and for preventing liquid flow through same when said slidable partition member moves in said one direction thereby causing said slidable partition member to slide in said one direction at a velocity slower than it slides in said another direction.

Claim 6

An impact absorption device comprising: a hollow cylinder having means defining a rod opening in one end; a first stationary partition member disposed in said cylinder dividing same into a first compartment and a second compartment; a second stationary partition member disposed in said first compartment dividing same into a first section and a second section and having means therein defining a rod opening therethrough, said second section containing therein a liquid; a slidable partition member slidable in said second compartment dividing same into a first chamber and a second chamber, said first chamber containing therein a liquid and said second chamber containing therein pressurized gas continuously biasing said slidable partition member in one direction, said slidable partition member effecting pressurization of said liquid in said first chamber when it moves in said one direction; a movable rod extending through said rod opening in said cylinder and through said rod opening in said second stationary member, said rod having sufficient size to effect pressurization of said liquid in said second section when said rod moves in a direction towards said first stationary partition member; means defining a passage in said first stationary partition member for flowing therethrough said liquid to enable same to flow between said first chamber and said second partition member thereby permitting said rod to move towards said stationary partition member thereby effecting an increase of pressure of the liquid in said second section and said first chamber and movement of said slidable partition member in another direction opposite said one direction and effecting an increase in pressure of said pressurized gas and for permitting said slidable partition member to slide in said one direction thereby effecting an increase in pressure of liquid in said first chamber and said second section and movment of said rod in a direction away from said first stationary partition member; and a load bearing member connected to said rod externally of said cylinder for transferring an impact load applied thereto to said rod thereby effecting movement of said rod towards said first stationary partition member and therefore pressurization of said liquid in said second section and said first chamber thereby moving said slidable partition member in said another direction to increase the pressure of said pressurized gas in said second chamber whereby when said impact load is removed from said load bearing member said pressurized gas effects sliding of said slidable partition member in said one directions and therfOre pressurization of said liquid in said first chamber and said second section and movement of said rod in a direction away from said first stationary partition member.

Claim 7

An impact absorption device comprising: a hollow cylinder having means defining a rod opening in one end; a first stationary partition member disposed in said cylinder dividing same into a first compartment and a second compartment; a second stationary partition member disposed in said first compartment dividing same into a first section and a second section and having means therein defining a rod opening therethrough, said second section containing therein a liquid; a slidable partition member slidable in said second compartment dividing same into a first chamber and a second chamber, said first chamber containing therein a liquid and said second chamber containing therein pressurized gas continuously biasing said slidable partition member in one direction, said slidable partition member effecting pressurization of said liquid in said first chamber when it moves in said one direction; a movable rod extending through said rod opening in said cylinder and through said rod opening in said second stationary member, said rod having sufficient size to effect pressurization of said liquid in said second section when said rod moves in a direction towards said first stationary partition member; means defining a passage in said first stationary partition member for flowing therethrough said liquid to enable same to flow between said first chamber and said second partition member thereby permitting said rod to move towards said stationary partition member thereby effecting an increase of pressure of the liquid in said second section and said first chamber and movement of said slidable partition member in another direction opposite said one direction and effecting an increase in pressure of said pressurized gas and for permitting said slidable partition member to slide in said one direction thereby effecting an increase in pressure of liquid in said first chamber and said second section and movment of said rod in a direction away from said first stationary partition member; and a load bearing member connected to said rod externally of said cylinder for transferring an impact load applied thereto to said rod thereby effecting movement of said rod towards said first stationary partition member and therefore pressurization of said liquid in said second section and said first chamber thereby moving said slidable partition member in said another direction to increase the pressure of said pressurized gas in said second chamber whereby when said impact load is removed from said load bearing member said pressurized gas effects sliding of said slidable partition member in said one directions and therfOre pressurization of said liquid in said first chamber and said second section and movement of said rod in a direction away from said first stationary partition member.

Claim 8

An impact absorption device according to claim 4; including means defining at least one additional passage in said first stationary partition member and at least one one-way check valve for permitting liquid flow through said one additional passage when said slidable stationary member moves in said another direction and for preventing liquid communicating through same when said slidable stationary member moves in said one direction thereby causing said slidable partition member to slide in said one direction at a velocity slower than it slides in said another direction.

Claim 9

An impact absorption device comprising: a hollow cylinder having means defining a rod opening in one end; a stationary partition member dividing said cylinder into a first compartment and a second compartment and having means therein defining a rod opening therethrough, said second compartment containing therein a liquid; a slidable partition member slidable in said first compartment dividing same into a first chamber and a second chamber and having means therein defining a rod opening therethrough, said first chamber containing therein a liquid and said second chamber containing therein pressurized gas continuously biasing said slidable partition member in one direction, said slidable partition member effecting pressurization of said liquid in said first chamber when it moves in said one direction; a rod extending through the rod opening in said cylinder, said slidable partition member and said stationary partition member, said rod effecting pressurization of said liquid in said second compartment when it moves into said second compartment; means defining a passage between said first chamber and said second compartment for flowing therethrough said liquid to enable same to flow between said second compartment and said first chamber and permitting said rod to move into said second compartment thereby increasing the pressure of said liquid in said second compartment and said first chamber and movement of said slidable partition member in another direction opposite said one direction and effecting an increase in pressure of said pressurized gas and for permitting said slidable partition member to slide in said one direction thereby effecting an increase in pressure of the liquid in said first chamber and said second compartment and movement of said rod out of said second compartment; and a load bearing member connected to said rod externally of said cylinder for transferring an impact load applied thereto said rod thereby effecting movement of said rod into said second compartment and therefor pressurization of said liquid in said second compartment and said first chamber thereby moving said slidable partition member in said another direction to increase the pressure of said pressurized gas in said second chamber whereby when said impact load is removed from said load bearing member said pressurized gas effects sliding of said slidable partition member in said one direction and therefore pressurization of said liquid in said first chamber and said second compartment and movement of said rod out of said second compartment.

Claim 10

An impact absorption device comprising: a hollow cylinder having means defining a rod opening in one end; a stationary partition member dividing said cylinder into a first compartment and a second compartment and having means therein defining a rod opening therethrough, said second compartment containing therein a liquid; a slidable partition member slidable in said first compartment dividing same into a first chamber and a second chamber and having means therein defining a rod opening therethrough, said first chamber containing therein a liquid and said second chamber containing therein pressurized gas continuously biasing said slidable partition member in one direction, said slidable partition member effecting pressurization of said liquid in said first chamber when it moves in said one direction; a rod extending through the rod opening in said cylinder, said slidable partition member and said stationary partition member, said rod effecting pressurization of said liquid in said second compartment when it moves into said second compartment; means defining a passage between said first chamber and said second compartment for flowing therethrough said liquid to enable same to flow between said second compartment and said first chamber and permitting said rod to move into said second compartment thereby increasing the pressure of said liquid in said second compartment and said first chamber and movement of said slidable partition member in another direction opposite said one direction and effecting an increase in pressure of said pressurized gas and for permitting said slidable partition member to slide in said one direction thereby effecting an increase in pressure of the liquid in said first chamber and said second compartment and movement of said rod out of said second compartment; and a load bearing member connected to said rod externally of said cylinder for transferring an impact load applied thereto said rod thereby effecting movement of said rod into said second compartment and therefor pressurization of said liquid in said second compartment and said first chamber thereby moving said slidable partition member in said another direction to increase the pressure of said pressurized gas in said second chamber whereby when said impact load is removed from said load bearing member said pressurized gas effects sliding of said slidable partition member in said one direction and therefore pressurization of said liquid in said first chamber and said second compartment and movement of said rod out of said second compartment.

Claim 11

An impact absorption device according to claim 6: wherein said means defining a passage comprises means defining a passage in said stationary partition member.

Claim 12

An impact absorption device according to claim 6: wherein said means defining a passage comprises means defining a passage in said rod.