Hinge assembly structure for opening and closing of door of storage facility

A storage facility comprising:

• a main body having at least one storage room and at least one opening providing access to said room;
• at least one door for opening and closing the opening providing access to said storage room;
• and
• hinge means for connecting each door rotatably to said main body adjacent said opening;
• each said hinge means including a first hinge receptacle means secured to said door and a second hinge receptacle means secured to said the main body adjacent said opening and engaged opposingly with said first hinge receptacle;
• and
• a hinge assembly including a fixing member having opposed ends defining passive rotators, each of said rotators having an inner cam surface;
• and a throughhole formed in said fixing member penetrating the passive rotators at the center thereof and defining a pivot axis for said door;
• said fixing member also having an exterior peripheral surface adapted to be received in one of said first and second hinge receptacles, the exterior peripheral surface of the fixing member and said one of said hinge receptacles in which it is received having first cooperating means preventing rotation of said fixing member in said one of said hinge receptacles during opening and closing of the door;
• said hinge assembly also including a pair of rotating cam members respectively located adjacent said opposed ends of the fixing member and each having a rotator cam surface engaged opposingly with the inner cam surface of the adjacent passive rotator of the fixing member and a throughhole penetrating the central portion of the rotating cam members;
• said rotating cam members being received in the other of said first and second hinge receptacles;
• the exterior peripheral surface of said rotating cam members and said other of said hinge receptacles in which they are received having second cooperating means preventing rotation of the rotating cam members in that receptacle during opening and closing of the door;
• a shaft located in and extending through the throughholes of the rotating cam members and the fixing member;
• stop means at the ends of said shaft extending beyond said rotating cam members, and a pair of elastic members respectively mounted on the ends of said shaft between said rotating cam members and said stop means, whereby when said door is opened and closed said fixing member rotates on said shaft relative to said rotating cam members such that the cam surfaces of said fixing member and rotating cam members move relative to each other to urge the rotating cam members in linear directions along the shaft under the bias of said elastic members, said cam surfaces of said fixing member and said rotating cam members having
• i) first cooperating cam surfaces causing said rotating cam members to move axially along said shaft away from the fixing member as the door is moved from its open to its closed position to compress said elastic members and increase pressure on the rotating cam members to urge them against the fixing member cam surfaces with a continuously increasing force up to a predetermined and almost closed position before the door is fully closed and
• ii) second cooperating cam surfaces having a slope counter to the slope of the first cooperating cam surfaces to allow the rotating cam members to move axially along the shaft toward the fixing member to reduce pressure of said elastic members on said rotating cam members as the door moves from its predetermined almost closed position to its fully closed position.