Adjusting device for adjusting a motor vehicle seat, motor vehicle seat, motor vehicle and method for adjusting a motor vehicle seat

A motor vehicle seat with a backrest adjustable relative to a seat part, the motor vehicle seat having an adjusting device for adjusting the backrest, the adjusting device comprising:

• an engagement fitting unit;
• a force transmission device configured to transmit a force for locking and unlocking the engagement fitting unit, the force transmission device having a first lever member rotatable about a first lever axis and a second member remote from the first lever member and rotatable about a second axis;
• a force step-up transmission device operably coupled to the first lever member and configured to step up the force transmitted by the force transmission device, the force step-up transmission device configured as a control cam rotatably mounted on the first lever member about a cam axis and further configured to variably step up the force transmitted by the force transmission device;
• and
• a flexible control cable interconnecting the force step-up transmission device and the second member such that the second member rotates about the second axis in response to rotation of the first lever member about the first lever axis.

A motor vehicle with a seat unit for a vehicle occupant, wherein the seat unit has a backrest adjustable relative to a seat part and an adjusting device for adjusting the backrest, the adjusting device comprising:

• an engagement fitting unit;
• a force transmission device configured to transmit a force for locking and unlocking the engagement fitting unit, the force transmission device having a first lever member rotatable about a first lever axis and a second member remote from the first lever member and rotatable about a second axis;
• a force step-up transmission device operably coupled to the first lever member and configured to step up the force transmitted by the force transmission device, the force step-up transmission device configured as a control cam rotatably mounted on the first lever member about a cam axis and further configured to variably step up the force transmitted by the force transmission device;
• and
• a flexible control cable interconnecting the force step-up transmission device and the second member such that the second member rotates about the second axis in response to rotation of the first lever member about the first lever axis.

A method for adjusting a motor vehicle seat using an adjusting device, the method comprising the steps of:

• transmitting, to an engagement fitting unit, a force for locking and unlocking the engagement fitting unit of the adjusting device with a force transmission device, the force transmission device having a first lever member rotatable about a first lever axis and a second member remote from the first lever member and rotatable about a second axis;
• and
• variably stepping up the force during the transmitting with a force step-up transmission device operably coupled to the first lever member and configured to step up the force transmitted by the force transmission device, the force step-up transmission device configured as a control cam rotatably mounted on the first lever member about a cam axis,
• wherein a flexible control cable interconnects the force step-up transmission device and the second member such that the second member rotates about the second axis in response to rotation of the first lever member about the first lever axis.