Abstract: A hinge structure with position-locking engagement means includes a bracket, which has on its side panel a pivot hole, a recessed positioning hole, and a first arched limiter groove adjacent to the recessed positioning hole and sloping in one direction, a pivot shaft inserted through the pivot hole of the side panel of the bracket and pivotally fastened to a support, a locating plate affixed to the pivot shaft, a ball rotatably mounted in a ball hole on the locating plate and selectively engageable into the recessed positioning hole and arched limiter groove of the side panel, a holding down spring plate affixed to the pivot shaft and having an actuation portion pressed on the ball to force the ball into the recessed positioning hole and first arched limiter groove of the side panel selectively, and spacer affixed to the pivot shaft and defining a gap between the holding down spring plate and the support for accommodating deformation of the actuation portion of the holding down spring plate when the bracket i

Abstract: A hinge structure with position-locking engagement means includes a bracket, which has on its side panel a pivot hole, a recessed positioning hole, and a first arched limiter groove adjacent to the recessed positioning hole and sloping in one direction, a pivot shaft inserted through the pivot hole of the side panel of the bracket and pivotally fastened to a support, a locating plate affixed to the pivot shaft, a ball rotatably mounted in a ball hole on the locating plate and selectively engageable into the recessed positioning hole and arched limiter groove of the side panel, a holding down spring plate affixed to the pivot shaft and having an actuation portion pressed on the ball to force the ball into the recessed positioning hole and first arched limiter groove of the side panel selectively, and spacer affixed to the pivot shaft and defining a gap between the holding down spring plate and the support for accommodating deformation of the actuation portion of the holding down spring plate when the bracket i

Abstract: A hinge structure includes a bracket, which has a horizontal base panel and a vertical side panel, a first pivot set inserted through the side panel of the bracket and rotatably coupled to a support and having two elongated ribs protruded from one end of the pivot shaft and a guide groove defined between the elongated ribs, a supplementary contact member mounted on the pivot shaft of the first pivot set and having a contact lug disposed in parallel to and flush with the elongated ribs, and a second pivot set inserted through the horizontal base panel of the bracket and rotatably coupled to a mounting frame and having a two flat cut faces at two sides of the head of the pivot shaft thereof for stopping against the elongated rids of the pivot shaft of the first pivot set and the contact lug of the supplementary contact member such that the second pivot set is locked when the first pivot set is not turned to the predetermined angle, or unlocked for rotation when the first pivot set is turned to the predetermined