| 摘要 |
A hinge for foldable ladders comprises a first joint member (10) with main discs (13, 14), a second joint member (20) with a sub discs (23), a locking device (30) having a button (32), connecting pin (31), coil spring (34), rectangular locking block (33) and a press locking control device (60) for controlling to latch or unlatch the locking device (30). The first and second joint members (10, 20) are combined together through a common axis of a center shaft (50). The sub disc (23) of the second joint member (20) is inserted between a pair of parallel spaced main discs (13, 14) of the first joint member (10). The main discs (13, 14) have the slot openings (13a, 13c) for inserting the locking device (30). A first and second protruded arcuate stoppers (15, 25) are disposed on the surface of the discs (14, 23) for matching each other. A plurality of detents (28) is formed around periphery of the sub disc (23). At one side of the slot opening (13c) of the main disc (14), a press locking control device (63) is elastically installed for actuating the device.
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