초록 ▼

A gas spring comprising a cylinder having a closed end and an open end with the rod of a piston projecting into the cylinder through the open end and a sealing assembly surrounding the rod adjacent the open end of the cylinder and normally sealing the interior of the cylinder from the surrounding at

A gas spring comprising a cylinder having a closed end and an open end with the rod of a piston projecting into the cylinder through the open end and a sealing assembly surrounding the rod adjacent the open end of the cylinder and normally sealing the interior of the cylinder from the surrounding atmosphere. The sealing assembly includes an annular resilient sealing member having surfaces which are in sealing engagement with the rod and the inner wall of the cylinder and a plurality of protuberances are formed on the inner wall of the cylinder and are located inwardly of the normal position of the sealing member. When the open end of the cylinder is placed in communication with a gas under pressure, the gas moves the sealing member into engagement with the protuberances so that openings are formed between the member and the inner wall of the cylinder and the gas flows into the cylinder through these openings. When the pressure source is removed, the pressurized gas in the cylinder forces the sealing member back to its normal position and, in this position, the member seals the interior of the cylinder from the outside.

대표청구항 ▼

A gas spring comprising, an elongated hollow cylinder having a closed end and an open end, a piston disposed within said cylinder, an elongated rod coaxial with said cylinder with a portion projecting into the cylinder through said open end and connected to said piston, at least one protuberance for

A gas spring comprising, an elongated hollow cylinder having a closed end and an open end, a piston disposed within said cylinder, an elongated rod coaxial with said cylinder with a portion projecting into the cylinder through said open end and connected to said piston, at least one protuberance formed on the inner wall of said cylinder and spaced from said open end, an annular sealing member made of a flexible material and encircling said rod, said member normally being disposed between said protuberance and said open end, a first annular surface formed on said member and engaging said rod around its complete circumference thereby to form a seal between the member and the rod, and a second annular surface formed on said member and normally engaging the inner wall of said cylinder around the entire circumference thereof thereby to form a seal between the member and said wall, said member being operable when said open end communicates with a source of gas under pressure to move axially into engagement with said protuberance and forming openings between said second surface and said inner wall adjacent said protuberance whereby gas may flow through said openings and into the interior of said cylinder, the gas within said cylinder being operable when said source is removed from said open end to move said member toward the open end and out of engagement with said protuberance whereby said member seals the interior of said cylinder from said open end.