Longitudinal adjuster for a vehicle seat, and vehicle seat

A longitudinal adjuster, comprising:

• one pair of rails and
• a drive device for the pair of rails,
• wherein the pair of rails has a first rail and a second rail, on which the first rail is guided displaceably,
• wherein the drive device has at least one geared motor with an output shaft, a motor, a gear unit, a spindle, which can be driven by the output shaft via the gear unit, and a coupling arrangement for coupling the spindle and the output shaft,
• wherein the spindle is mounted rotatably about a spindle axis,
• wherein the coupling arrangement comprises a flexible coupling which is connected in a form-fitting and/or force-fitting manner on the one hand to a spindle end and on the other hand to a shaft end of the output shaft and which connects the spindle end and the shaft end flexibly to each other,
• wherein the flexible coupling is configured as a claw coupling,
• wherein the claw coupling is provided with respective claws at both ends, and a nut element arranged in a form-fitting manner on the spindle end is provided with claw mating elements.