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An adjustable speed gas spring primarily adapted for use as a part of a door closing mechanism. The gas spring includes a piston assembly which is disposed within an elongated fluid chamber and which upon relative rotation of the shaft with respect to the tubular body, permits the user to adjust the

An adjustable speed gas spring primarily adapted for use as a part of a door closing mechanism. The gas spring includes a piston assembly which is disposed within an elongated fluid chamber and which upon relative rotation of the shaft with respect to the tubular body, permits the user to adjust the shaft extension velocity. The gas spring is fully functional in any shaft orientation.

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An adjustable speed gas spring adapted for assisting in closing a door in a building where the gas spring velocity in at least one direction determines the closing speed of the door, the gas spring comprising: a tubular body having an inner wall that defines an elongated fluid chamber therein, the f

An adjustable speed gas spring adapted for assisting in closing a door in a building where the gas spring velocity in at least one direction determines the closing speed of the door, the gas spring comprising: a tubular body having an inner wall that defines an elongated fluid chamber therein, the fluid chamber having a first end and a second end and also having a longitudinal axis that extends between the first and second ends, with the first and second ends of the fluid chamber each having normally closed openings therein, with the fluid chamber being filled with at least a first pressurized fluid, and with the second end of the body adapted to be connected with selectively one of the building adjacent to the door and the door; a shaft having a central axis, a first end and a second end, with the first end of the shaft having a shoulder thereon and extending into the first end of the fluid chamber so that the axes of the fluid chamber and the shaft are coaxial and so that the first end of the shaft may reciprocally move in the fluid chamber parallel to the axis of the fluid chamber, and with the second end of the shaft adapted to be connected with selectively the other of the door or the building adjacent to the door, and with the shoulder being adjacent to the first end of the shaft; a first piston assembly supported on and about the shaft adjacent the first end of the shaft and serving to separate the fluid chamber into a first sub-chamber that is adjacent the first end of fluid chamber and a second sub-chamber that is adjacent to the second end of the fluid chamber, the first piston assembly including: (a) a sub-assembly that has a first side facing one end of the fluid chamber, that has a second side facing the other end of the fluid chamber and that has an axial opening through which the first end of the shaft extends; (b) a first flow path and a second fluid flow path, with a part of both the first and second flow paths being disposed, in part, in the sub-assembly and extending between the first and second sub chambers, and with the first flow path providing less restriction to the flow of fluid than the second flow path; (c) a first member connected with the first end of the shaft so as to move therewith, with the first member having a first side that faces the one end of the fluid chamber and that is adjacent to the second side of the sub-assembly, with another part of the second flow path being defined between the second side of the sub-assembly and the first side of the first member and with the relative angular positioning of the second side of the sub-assembly and first side of the first member determining the flow area of the other part of the second flow path; and means for permitting the shaft and selectively one of the sub-assembly and the first member to be rotated relative to each about the axis of the shaft such that the relative rotation will cause relative rotational movement between the second side of the sub-assembly and the first side of the first member of the sub-assembly so as to cause the flow area of the other part of the second flow path to be changed.