Mechanism for positioning seat of exercising apparatus

The utility model provides a mechanism for positioning seat of exercising device. The exercising device is provided with a main frame and a seat group. The seat group can slip on the main frame. The positioning mechanism comprises a gear row, a base, an inserted piece, an immobilising arm and an elastic piece; the gear row is arranged on the main frame along the slip direction of the seat group; the base is arranged on the seat group; the inserted piece which is arranged on the base in a movable modus can move between an anti-trigger position and a clamping position, and when the inserted piece is positioned at the clamping position, the inserted piece is inserted and clamped with the gear row; the immobilising arm is pivoted on the base, one end of the immobilising arm is connected with the inserted piece, the other end is a trip portion used for feeding users to trip, and the inserted piece can be driven to move; one end of the elastic piece is bunted at the base, and when the elastic piece is in the natural state, the inserted piece is made to position at the clamping position.