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An improved arrangement for adjusting crawler-type transport assemblies in a self-propelled construction vehicle between two differing "home" positions. The crawler transport assembly comprises a steering mechanism including a collar assembly operated via an actuator mounted to the frame of the appa

An improved arrangement for adjusting crawler-type transport assemblies in a self-propelled construction vehicle between two differing "home" positions. The crawler transport assembly comprises a steering mechanism including a collar assembly operated via an actuator mounted to the frame of the apparatus for driving steering rotation of the transport assembly via the collar assembly. The collar assembly comprises a driving element integrally coupled to the actuator and a driven element integrally coupled to the transport assembly. The driven element can be affixed to the driving element selectively in two differing dispositions corresponding to the two "home" positions of the transport assembly.

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An improved arrangement for adjusting crawler-type transport assemblies in a self-propelled construction vehicle between two differing "home" positions. The crawler transport assembly comprises a steering mechanism including a collar assembly operated via an actuator mounted to the frame of the appa

An improved arrangement for adjusting crawler-type transport assemblies in a self-propelled construction vehicle between two differing "home" positions. The crawler transport assembly comprises a steering mechanism including a collar assembly operated via an actuator mounted to the frame of the apparatus for driving steering rotation of the transport assembly via the collar assembly. The collar assembly comprises a driving element integrally coupled to the actuator and a driven element integrally coupled to the transport assembly. The driven element can be affixed to the driving element selectively in two differing dispositions corresponding to the two "home" positions of the transport assembly. n and a lower section; each of said upper and lower sections being independently inflatable, said upper and lower sections being slightly narrower than a combined width of said central and side platens; a reaction board disposed on said upper section and having a width slightly narrower than said central platen and a length substantially equal to said upper section, said reaction board having an edge hinged to a center of said central platen; a pneumatic actuating subassembly secured beneath said central platen, said pneumatic actuating subassembly comprising an air blower connected to a feed valve connected at said air blower; a first valve actuator connected at each end of said feed valve; one of said first valve actuator opening an air supply to said upper section, another first valve actuator opening an air supply to said lower section; a pair of dump valves; one dump valve for said upper section, another dump valve for said lower section of said pneumatic bag subassembly; and a pair of second valve actuators for said pair of dump valves; an articulated mattress placed on said pneumatic bag subassembly, said articulated mattress including a central segment having a pair of longitudinal sides, to each of which is attached a lateral segment; and a pair of side rail assemblies, each of which being pivotally mounted to one of said exterior long margin of said side platen. 2. A pair of side rail assemblies, adaptable for use with a bed with adjustable positions, which bed comprises head, foot and central units, the latter being supported at one end by said head unit and at the other end by said foot unit; means for rotating said central unit; a pair of inclination subassemblies used during the rotation of the bed; a pneumatic bag subassembly disposed on a central and side platen of said central unit; a pneumatic actuating subassembly secured beneath said central platen; an articulated mattress placed on said pneumatic bag subassembly, wherein said pair of side rail subassemblies comprises a pair of frames, each of said frames being attached to an exterior long margin of said side platen. 3. A pair of side rail assemblies, adaptable for use with a bed with adjustable positions, as defined in claim 2, wherein each of said frames includes an upper tube; a lower tube; several vertical tubes firmly connecting said upper and lower tubes; an arm having one end attached to an extremity of said lower tube and another end attached to a pin; a bearing block mounted with a close running fit on said pin and firmly attached to an exterior long margin of said side platen; and a latch pin block comprising a spring loaded pin for vertical translation in a slot of a footboard or a headboard of said bed with adjustable positions. 4. A pneumatic bag subassembly, adaptable for use with a bed with adjustable positions, which bed comprises head, foot and central units, the latter being supported at one end by said head unit and at the other end by said foot unit; means for rotating said central unit; a pair of inclination subassemblies used during the rotation of the bed; a pneumatic actuating subassembly secured beneath a central platen of said central unit; an articulated mattress placed on said pneumatic bag subassembly; said pneumatic bag subassembly including upper and lower sections placed on a central and side platens of said central unit, said upper and lower sections being slightly narrower than a combined width of said central and side platens; each of said sections being independently inflatable; said upper section incorporating at least two superposed, interconnected bags; said lower section comprising a single compartment bag; said upper and lower sections being each provided with a fitting passing through said central platen; and a reaction board, having a width slightly narrower than said central platen and a length substantially equal to said upper section, being placed on said upper se