A locking apparatus. The apparatus comprises a fixed element (2) and a rotating element (1). The fixed element (2) and the rotating element (1) are sheet metals bent into U-groove structures are provided on the rotating element (1). A primary pin shaft (3A), a secondary pin shaft (3B), and an engaging pin shaft (3C). A C-shaped engaging groove (2B22) is provided on the fixed element (2). The fixed element (2) and the rotating element (1) are connected with each other via the primary pin shaft (3A). The rotating element (1) rotates around the primary pin shaft (3A) to constitute an opened state or an engaged state with the fixed element (2). The rotating element (1) in the opened state rotates around the primary pin shaft (3A) into the engaged state, then rotates forward into a disengaging process, and finally rotates backward to restore to the opened state. An elbow support apparatus of a vertebral traction bed made with the locking apparatus. Left and right holes (6A1 and 6A2) are provided on either side of a mattress at positions of the human elbows. Left and right support blocks (8A and 8B) respectively are buried within the left and right holes (6A1 and 6A2). The locking apparatus is in the engaged state when the support blocks are in a vertically fixed state the locking apparatus is in the opened state when the support blocks are in a horizontally placed state.La présente invention concerne un appareil de verrouillage. Lappareil comprend un élément fixe (2) et un élément rotatif (1). Lélément fixe (2) et lélément rotatif (1) sont des tôles pliées en structures de rainure en U. Sur lélément rotatif (1) sont disposés un axe de broche primaire (3A), un axe de broche secondaire (3B) et un axe de broche de mise en prise (3C). Une rainure de mise en prise en forme de C (2B22) est disposée sur lélément fixe (2). Lélément fixe (2) et lélément rotatif (1) sont reliés lun à lautre par lintermédiaire de laxe de broche primaire (3A). Lélément rotatif (1) tourne autour de l
