A door actuator for opening and/or closing a door, includes a fluid housing with an inner compartment, which is filled with fluid, in particular hydraulic oil, a fluid housing opening in the fluid housing for draining the fluid at thermal overload, a thermally activatable valve for opening, which closes the fluid housing opening, and a collecting device, which is disposed outside the fluid housing opposite the fluid housing opening, forms a collecting space for the fluid, is open towards the fluid housing opening, and includes at least one drain opening for draining the fluid from the collecting space.

A door actuator for opening and/or closing a door, includes a fluid housing with an inner compartment, which is filled with fluid, in particular hydraulic oil, a fluid housing opening in the fluid housing for draining the fluid at thermal overload, a thermally activatable valve for opening, which closes the fluid housing opening, and a collecting device, which is disposed outside the fluid housing opposite the fluid housing opening, forms a collecting space for the fluid, is open towards the fluid housing opening, and includes at least one drain opening for draining the fluid from the collecting space.

A door and door jamb arrangement, for securing the opening of a secure space. The door and door jamb arrangement include a safe container, a safe room or a lockable container. The door jamb arrangement further including a door and the opening. The door is adapted to be hingedly attached to a door jamb with a hinge arrangement. The door has a hinged edge or end, and non-hinged edges or ends including a top, bottom and a remote edge. The opening has a planar space defined by the door jamb and is adapted to be closed by the door in a closed position. A hinge axis of the hinge arrangement is adapted, near or adjacent the closed position, to move laterally relative to one or both of the door or the door jamb. The hinge axis of the hinge arrangement is adapted, near or adjacent the closed position, to move at least a door portion of two adjacent edges of the door relative to corresponding and adjacent jamb portions of an edge of the door jamb between overlapping and non-overlapping positions. The door is adapted to move vertically relative to the door jamb.

A pneumatic release system has an inlet arranged to be connected, in use, to a supply of pressurised fluid, and an outlet arranged, to be connected, in use, to an end device. The system defines therethrough, a flow path for fluid from the inlet to the outlet. The system includes a piston mounted in and axially moveable relative to a cylinder, the inlet and outlet defined in the cylinder. The piston has a piston end on which are mounted upper and lower seals and is biased to a first closed position, in which the upper and lower seals define a chamber within the cylinder to retain pressurised fluid from the inlet, the upper seals preventing flow of the fluid from the chamber to the outlet, and wherein an external force applied to the piston moves the upper seals away from sealing engagement with the cylinder.

A pneumatic release system has an inlet arranged to be connected, in use, to a supply of pressurised fluid, and an outlet arranged, to be connected, in use, to an end device. The system defines therethrough, a flow path for fluid from the inlet to the outlet. The system includes a piston mounted in and axially moveable relative to a cylinder, the inlet and outlet defined in the cylinder. The piston has a piston end on which are mounted upper and lower seals and is biased to a first closed position, in which the upper and lower seals define a chamber within the cylinder to retain pressurised fluid from the inlet, the upper seals preventing flow of the fluid from the chamber to the outlet, and wherein an external force applied to the piston moves the upper seals away from sealing engagement with the cylinder.

A linear actuator includes a jacket defining an axis, and a rod having an end cylinder tightly slidable within the jacket and an opposite end sliding between a rest position and a working position. The end cylinder divides the jacket into a first and second variable volume compartment fluidically independent from each other, one of the first or second variable volume compartment being fluidically insulated and under vacuum, the other one fluidly communicating with the outside environment. The jacket has an abutment member having a non-return valve mechanism adapted to discharge ambient air that may be entrapped between the end cylinder and the abutment member.

A linear actuator includes a jacket defining an axis, and a rod having an end cylinder tightly slidable within the jacket and an opposite end sliding between a rest position and a working position. The end cylinder divides the jacket into a first and second variable volume compartment fluidically independent from each other, one of the first or second variable volume compartment being fluidically insulated and under vacuum, the other one fluidly communicating with the outside environment. The jacket has an abutment member having a non-return valve mechanism adapted to discharge ambient air that may be entrapped between the end cylinder and the abutment member.

A door for closing a chamber opening (4) in a chamber wall of a vacuum chamber (3) in relation to a surrounding space, in which the vacuum chamber is located, includes a door housing arranged in a surrounding space, a closing member (5) arranged in the surrounding space, and a rod (10), to which the closing member (5) is connected, wherein a first movement of the rod (10), through which the closing member (5) is displaced from an open position into an intermediate position, occurring in the form of a displacement of the rod (10) in the direction of the longitudinal axis thereof, wherein a second movement of the rod (10) subsequent thereto occurs in the form of a displacement of the rod (10) in a direction at an angle to the longitudinal axis thereof and/or in the form of a pivoting of the rod (10) about a pivot axis which is perpendicular to the longitudinal axis thereof, wherein the closing member is displaced from the intermediate position into a closed position via said second movement of the rod. The rod (10) is mounted in a moveable manner via the bearing elements, via the first movement thereof and via the second movement thereof in relation to the door housing, wherein the bearing elements are arranged in an inner space (30) of the door housing, which inner space is sealed with respect to the surrounding space or is connected to the surrounding space via a passage (41) extending through a housing wall (40) of the door housing, in which passage a particle filter is arranged. The rod (10) is guided out of the inner space (30) of the door housing into the surrounding space in a sealed manner.

A door for closing a chamber opening (4) in a chamber wall of a vacuum chamber (3) in relation to a surrounding space, in which the vacuum chamber is located, includes a door housing arranged in a surrounding space, a closing member (5) arranged in the surrounding space, and a rod (10), to which the closing member (5) is connected, wherein a first movement of the rod (10), through which the closing member (5) is displaced from an open position into an intermediate position, occurring in the form of a displacement of the rod (10) in the direction of the longitudinal axis thereof, wherein a second movement of the rod (10) subsequent thereto occurs in the form of a displacement of the rod (10) in a direction at an angle to the longitudinal axis thereof and/or in the form of a pivoting of the rod (10) about a pivot axis which is perpendicular to the longitudinal axis thereof, wherein the closing member is displaced from the intermediate position into a closed position via said second movement of the rod. The rod (10) is mounted in a moveable manner via the bearing elements, via the first movement thereof and via the second movement thereof in relation to the door housing, wherein the bearing elements are arranged in an inner space (30) of the door housing, which inner space is sealed with respect to the surrounding space or is connected to the surrounding space via a passage (41) extending through a housing wall (40) of the door housing, in which passage a particle filter is arranged. The rod (10) is guided out of the inner space (30) of the door housing into the surrounding space in a sealed manner.

A tractor (1) includes a bonnet (2) and bonnet mover (10) suitable for guiding movement of the bonnet (2) in rotational translation between a closed position and an open position.