Spring hinge

• US 3,209,392 A
• Filed: 07/26/1963
• Issued: 10/05/1965
• Est. Priority Date: 07/26/1963
• Status: Expired due to Term

• Current Assignee: Nathan Levine
• Original Assignee: Nathan Levine
• Inventors: Levine, Nathan
• Application Number:
  US04/297,793
• Time in Patent Office: 802 Days
• US Class Current: 16/289
• CPC Class Codes: E05F 1/1261 for counterbalancing
• CPC Class Codes: E05Y 2900/612 for manhole covers

Claims

2. A SPRING HINGE STRUCTURE FOR USE IN A HATCHWAY, SAID HATCHWAY INCLUDING A SIDE WALL AND A HATCH DOOR DESIGNED FOR MOVEMENT FROM A CLOSED POSITION GENERALLY NORMAL TO SAID SIDE WALL TO AN OPEN POSITION GENERALLY PARALLEL TO SAID SIDE WALL COMPRISING, A U-SHAPED HINGE ARM AFFIXED AT A FIRST END THEREOF TO SAID HATCH DOOR, SAID HINGE ARM HAVING A SECOND END PROVIDED WITH AN APERTURE THERETHROUGH;

A PIVOT PIN MOUNTING BRACKET SECURE TO SAID HATCH SIDE WALL;

A HINGE PIVOT PIN MOUNTED IN SAID BRACKET TO ENGAGE SAID APERTURE IN SAID SECOND END OF SAID HINGE ARM;

SPRING MEANS INCLUDING A TELESCOPING SPRING CASING CONTAINING A COILED COMPRESSION SPRING;

MEANS RIGIDLY AFFIXING A PORTION OF SAID TELESCOPING CASING TO SAID SIDE WALL OF SAID LATCH FOR TELECOPING MOVEMENT THEREOF PARALLEL TO SAID SIDE WALL, SAID SPRING MEANS BEING POSITIONED ON SAID SIDE WALL IN ALIGNMENT WITH SAID HINGE ARM;

FIRST PIVOT MEANS MOUNTED ON SAID TELESCOPING CASING AT THE END THEREOF ADJACENT SAID HINGE ARM;

AT LEAST ONE LINK MOUNTED AT A FIRST END ON SAID PIVOT MEANS ON SAID TELESCOPING CASING, AND SECOND PIVOT MEANS ATTACHED SUBSTANTIALLY AT THE BOTTOM OF SAID U-SHAPED PORTION OF SIAD HINGE ARM FOR ENGAGEMENT BY A SECOND END OF SAID AT LEAST ONE LINK WHEREBY MOVEMENT OF SAID SPRING PARALLEL TO SAID HATCH WALL WILL ASSIST ROTATION OF SAID HINGE ARM ABOUT SAID HINGE PIVOT ON SAID HATCH WALL.