A hoist (1) where said hoist comprises a trolley (3) with one or more wheels arranged to run along a first running surface (2a) of a rail (2). Said trolley (3) comprises one or more drive wheels (14) and one or more suspension wheels (11). The one or more suspension wheels (11) are rotatably fixed on a cart (7). One or more drive wheels (14) are rotatably fixed to a bracket (8) and said bracket (8) is pivotably connected via a hinge (16) to the cart (7). Said trolley (3) comprises a spring member (21) having a first end connected to the cart (7) and second end connected to the bracket (8). The spring member (21) is provided for pressing the one or more drive wheels (14) against a running surface (2b) on the rail (2). A shaft (22) with an eccentric cam (23) is rotatably mounted in the bracket (8). The eccentric cam (23) acts upon rotation against an edge surface (27) on the cart (7) for rotation of the bracket (8) in relation to the cart in the hinge (16). Hereby said one or more drive wheels (14) are released from contact with the running surface (2b), whereby the one or more suspension wheels (11) are able to rotate freely along the rail (2), e.g. by moving the hoist manually in the rail (2). This provides a safety locking and releasing system for the hoist in relation to the rail (2).L'invention concerne un appareil de levage (1) dans lequel ledit appareil de levage comprend un wagonnet (3) doté d'une ou de plusieurs roues agencées pour rouler le long d'une première surface de roulement (2a) d'un rail (2). Ledit wagonnet (3) comprend une ou plusieurs roues motrices (14) et une ou plusieurs roues de suspension (11). La ou les roues de suspension (11) sont fixées de manière rotative sur un chariot (7). Une ou plusieurs roues motrices (14) sont fixées rotatives à un support (8) et ledit support (8) est raccordé de manière pivotante par le biais d'une charnière (16) au chariot (7). Ledit wagonnet (3) comprend un élément de ressort (21) dont une extrémité est raccordée
