公开(公告)号：US3555591A

公开(公告)日：1971-01-19

申请号：US3555591D

申请日：1968-06-25

Applicant: NASH P SOGOIAN

Inventor： SOGOIAN NASH P

IPC: E05F3/16

CPC classification number: E05F3/16 ,  E05Y2900/132 ,  Y10T16/27 ,  Y10T16/61

Abstract: A DOOR CHECK FORMED OF A TUBULAR HOUSING WITH SPRINGS, A FRICTION RETARDING ELEMENT, AND A CONE-SHAPED WEDGE THEREIN IN WHICH ONE END OF THE HOUSING IS PIVOTALLY HELD TO THE DOOR FRAME. A ROD EXTENDING FROM THE OTHER END IS PIVOTALLY ATTACHED TO THE DOOR. AS THE DOOR IS OPENED THE SPRING IS READILY COMPRESSED, AND AS THE DOOR IS RELEASED THE SPRING AUTOMATICALLY CLOSES THE DOOR AND AT THE SAME TIME FORCES THE WEDGE INTO THE FRICTION ELEMENT WHICH BEARS AGAINST THE INNER SURFACE OF THE HOUSING RETARDING THE CLOSING OF THE DOOR. A SECOND SPRING IS PROVIDED FOR MAINTAINING THE FRICTION RETARDING ELEMENT AGAINST THE WEDGE DURING THE OPENING OF THE DOOR.