Mounting frame for displacing and fixing in a shaft, comprising - a main frame, - a support component having a support surface for supporting the mounting frame via the support surface against a first shaft wall of the shaft when the mounting frame is displaced in a displacement direction, - a primary fixing component having a fixing surface for supporting the mounting frame via the fixing surface against the first shaft wall when the mounting frame is fixed in the shaft, and - a secondary fixing component having a contact part for supporting the mounting frame via the contact part against a second shaft wall of the shaft, which second wall is opposite the first shaft wall in a fixing direction, when the mounting frame is fixed in the shaft, - the support component and the primary fixing component being arranged on a first side of the main frame, and - the secondary fixing component being arranged on a second side of the main frame, which second side is opposite the first side in the fixing direction, characterized in that - the primary fixing component is arranged on the main frame so as to be immovable relative to the main frame, - the contact part of the secondary fixing component is arranged on the main frame so as to be movable in the fixing direction relative to the main frame and can assume a fixing position and a displacement position, the contact part being spaced further outward in the fixing direction from the main frame in the fixing position than in the displacement position, and - the support component is arranged on the main frame so as to be at least partially movable in the fixing direction relative to the main frame and can assume a fixing position and a displacement position, with no part of the support surface being spaced further outward in the fixing direction from the main frame in the fixing position than the fixing surface of the primary fixing component, and the support surface being spaced further outward in the fixing direction from the main frame in the displacement position than the fixing surface. - a main frame, - a support component having a support surface for supporting the mounting frame via the support surface against a first shaft wall of the shaft when the mounting frame is displaced in a displacement direction, - a primary fixing component having a fixing surface for supporting the mounting frame via the fixing surface against the first shaft wall when the mounting frame is fixed in the shaft, and - a secondary fixing component having a contact part for supporting the mounting frame via the contact part against a second shaft wall of the shaft, which second wall is opposite the first shaft wall in a fixing direction, when the mounting frame is fixed in the shaft, - the support component and the primary fixing component being arranged on a first side of the main frame, and - the secondary fixing component being arranged on a second side of the main frame, which second side is opposite the first side in the fixing direction, - the primary fixing component is arranged on the main frame so as to be immovable relative to the main frame, - the contact part of the secondary fixing component is arranged on the main frame so as to be movable in the fixing direction relative to the main frame and can assume a fixing position and a displacement position, the contact part being spaced further outward in the fixing direction from the main frame in the fixing position than in the displacement position, and - the support component is arranged on the main frame so as to be at least partially movable in the fixing direction relative to the main frame and can assume a fixing position and a displacement position, with no part of the support surface being spaced further outward in the fixing direction from the main frame in the fixing position than the fixing surface of the primary fixing component, and the support surface being spaced further outward in the fixing direction from the main frame in the displacement position than the fixing surface.