Case hinge structure

US 6,499,188 B1
Case hinge structure
Chun Lung Cheng, 1786 Curtiss Ct., La Veine, Calif. 91750 (US)
Assigned to Dorma Door Controls, Inc, Reamstown, Pa. (US)
Filed on 17-Oct-2000, as Appl. No. Dorma Door Controls, Inc, Reamstown, Pa. (US)
Int. Cl.7E05D 1/06

US 6,499,188 B1 Case hinge structure Chun Lung Cheng, 1786 Curtiss Ct., La Veine, Calif. 91750 (US) Filed on Oct. 17, 2000, as Appl. No. 9/688,430. Int. Cl.7E05D 1/06 U.S. Cl. 168212;269 14 Claims 1. A case hinge structure adapted for installing on a case, comprising: a case body having a box shape comprising a rear panel; and a case cover comprising a rear wall wherein said hinge structure is affixed between said rear panel of said case body and said rear wall of said case cover in such a manner that said case cover is adapted for pivotally folding from a closed position to an open position, wherein in said closed position, said case cover is tightly cover on top of said case body, and in said open position, said case cover is pivotally folded up at a predetermined folding angle with respect to said case body; said hinge structure comprising: a lower joint, which is upwardly extended from said rear panel of said case body, comprising a supporting arm having a C-shaped cross-section defining a mounting slot therein, wherein said lower joint further, comprises a plurality of locking surfaces integrally provided on said inner an inner circumferential surface of the supporting arm so as to form a polygon of said mounting slot; and an upper joint, which is downwardly extended from said rear wall of said case cover, having a pivot arm rotatably and coaxially received in said mounting slot of said lower joint in such a manner that a mutual friction is provided between an outer circumferential surface of said pivot arm and said inner circumferential surface; and of said supporting arm so as to frictionally adjust said folding angle of said case cover when opening said case, wherein said upper joint comprises a plurality of driving surfaces coaxially provided on said outer circumferential surface of said pivot arm wherein said driving surfaces are arranged to engage with said respective locking surfaces, so as to frictionally hold said case cover at said folding angle with respect to said case body.