A non-rotating piston (10) for slidable and longitudinal displacement within a corresponding channel housing (12) defining a housing axis (28) thereof includes a body (20) having a polygonal section formed with a plurality of rectilinear section edges (22) defining corners (24) therebetween. The body (20) defines a piston axis (26) being locally coaxial with the housing axis (28). A seal assembly (30) is mounted on the body (20) to operably interface with an inner wall (32) of the housing (12). The seal assembly (30) includes, along each section edge (22), at least one seal plate (34) being biased radially outwardly towards the housing inner wall (32) in a direction generally perpendicular to the respective section edge (22), and at each corner (24), a seal wedge (38) slidably and sealably connected to respective seal plates (34) of the section edges (22) defining the corner (24). The seal wedge (38) is biased radially outwardly towards a respective inner corner of the housing (12) defined by corresponding housing inner walls (32).
A non-rotating piston (10) for slidable and longitudinal displacement within a corresponding channel housing (12) defining a housing axis (28) thereof includes a body (20) having a polygonal section formed with a plurality of rectilinear section edges (22) defining corners (24) therebetween. The body (20) defines a piston axis (26) being locally coaxial with the housing axis (28). A seal assembly (30) is mounted on the body (20) to operably interface with an inner wall (32) of the housing (12). The seal assembly (30) includes, along each section edge (22), at least one seal plate (34) being biased radially outwardly towards the housing inner wall (32) in a direction generally perpendicular to the respective section edge (22), and at each corner (24), a seal wedge (38) slidably and sealably connected to respective seal plates (34) of the section edges (22) defining the corner (24). The seal wedge (38) is biased radially outwardly towards a respective inner corner of the housing (12) defined by corresponding housing inner walls (32).
A proportional valve (10) for controlling an amount of pressurized fluid flowing into a pressurizable first chamber (12) from a pressurized fluid reservoir second chamber (18) and out from the first chamber (12) into an exhaust third chamber (20) includes an expandable closed chamber (22) formed with first (24) and second (26) disc plates connected to one another at a respective perimeter thereof. The two disc plates (24, 26) are axially slidably mounted on a support structure (30). The expandable chamber (22) is adapted to operate opening or closing of a fluid first passageway (34) between the first chamber (12) and the third chamber (20), and operate opening or closing of a fluid second passageway (36) between the first chamber (12) and the second chamber (18). A fluid flow passageway (31) extends through the first disc plate (24) in fluid communication with the closed chamber (22) for selective passage of a valve operating pressure fluid.
A proportional valve (10) for controlling an amount of pressurized fluid flowing into a pressurizable first chamber (12) from a pressurized fluid reservoir second chamber (18) and out from the first chamber (12) into an exhaust third chamber (20) includes an expandable closed chamber (22) formed with first (24) and second (26) disc plates connected to one another at a respective perimeter thereof. The two disc plates (24, 26) are axially slidably mounted on a support structure (30). The expandable chamber (22) is adapted to operate opening or closing of a fluid first passageway (34) between the first chamber (12) and the third chamber (20), and operate opening or closing of a fluid second passageway (36) between the first chamber (12) and the second chamber (18). A fluid flow passageway (31) extends through the first disc plate (24) in fluid communication with the closed chamber (22) for selective passage of a valve operating pressure fluid.
A rail assembly (10) for linearly displacing a first object (12) relative to a second object (14) and being carryable by the first object (12) includes a rail member (16) for connection with the first object (12), and a guiding mechanism (20) for allowing self-docking thereof with the second object (14). The rail assembly (10), upon at least one external force (F, P) being applied thereon, is displaceable between a stowed configuration (30) in which the rail assembly (10) is in a stowed position relative to the first object (12) and fully carryable thereby, and a fully deployed configuration (36) in which the rail assembly (10) is fully docked onto the second object (14) for fully supporting the first object (12).
E04B 7/16 - Roof structures with movable roof parts
B25J 5/04 - Manipulators mounted on wheels or on carriages travelling along a guideway wherein the guideway is also moved, e.g. travelling crane bridge type
A load displacement apparatus to displace a mobile platform along a structure includes a worm screw mounted on the platform for rotation about its axis that meshes with a plurality of support blocks mounted on the structure. The support blocks are spaced apart from one another along the structure to be successively engaged by the worm screw. Each support block includes a plurality of bearing balls freely movably supported and retained therein to selectively and movably engage the worm screw over at least an arc segment thereof such that the worm screw is always in meshing engagement with at least one of the support blocks. A scaffolding system incorporating the apparatus is also described.
A retractable roof system (30) for a large building structure (32) for selectively closing off an opening (39) of a fixed roof (34) of the building structure (32), the system includes at least one roof section (40) movably mountable on at least one pier (42) of substantially C-section when viewed in profile. The or each pier (42) comprises a ground-engaging foot (43) with an upstanding substantially columnar portion (48) leading to a substantially horizontal top section (50) provided with a movable bracket (44) reciprocable in guide channels (54) formed in the top section (50) and actuable by a deployment mechanism (46).
A retractable roof system (30) for a large building structure (32) for selectively closing off an opening (39) of a fixed roof (34) of the building structure (32), the system includes at least one roof section (40) movably mountable on at least one pier (42). A deployment mechanism (46) is provided and includes ropes (66) and pulleys (68) appropriately mounted on the top section (50) of the pier (42). The ropes (66) extend from an actuating piston (60) to the movable part (44) of the top section (50).
A retractable roof system (30) for a large building structure (32) for selectively closing off an opening (39) of a fixed roof (34) of the building structure (32), the system includes at least one roof section (40) movably mountable on at least one pier (42). A deployment mechanism (46) is provided and includes ropes (66) and pulleys (68) appropriately mounted on the top section (50) of the pier (42). The ropes (66) extend from an actuating piston (60) to the movable part (44) of the top section (50).
A retractable roof system (30) for a large building structure (32) for selectively closing off an opening (39) of a fixed roof (34) of the building structure (32), the system includes at least one roof section (40) movably mountable on at least one pier (42). A deployment mechanism (46) is provided and includes a weight assembly in the form of a piston (76) of cylindrical form and comprising a generally cylindrical body (76) provided with top and bottom ring-type cylinder bumpers (78) and seal rings (84) let into ring grooves formed in the surface of the piston.
A retractable roof system (30) for a large building structure (32) for selectively closing off an opening (39) of a fixed roof (34) of the building structure (32), the system includes at least one roof section (40) movably mountable on at least one pier (42). A deployment mechanism (46) is provided and includes a weight assembly in the form of a piston (76) of cylindrical form and comprising a generally cylindrical body (76) provided with top and bottom ring-type cylinder bumpers (78) and seal rings (84) let into ring grooves formed in the surface of the piston.
A retractable roof system (30) for a large building structure (32) for selectively closing off an opening (39) of a fixed roof (34) of the building structure (32), the system includes at least one roof section (40) movably mountable on at least one pier (42) of substantially C-section when viewed in profile. The or each pier (42) comprises a ground-engaging foot (43) with an upstanding substantially columnar portion (48) leading to a substantially horizontal top section (50) provided with a movable bracket (44) reciprocable in guide channels (54) formed in the top section (50) and actuable by a deployment mechanism (46).
patents
