Rollover protection device

1. A rollover protection device disposed behind vehicle seats of a motor vehicle, being a convertible with a convertible top, the rollover protection device comprising:

two rollover protection cassettes each containing an extendible rollbar and a housing, said rollover protection cassettes including an actuator for triggering said rollbar, one of said rollover protection cassettes and said housing being a supporting component of a stiffening support being of multi-part construction and extending in a transverse direction of the motor vehicle;

a connecting profile extending in the transverse direction of the motor vehicle and disposed between said two rollover protection cassettes; and

two joining arms via which said two rollover protection cassettes are joined to a supporting structure of the motor vehicle.

2. The rollover protection device according to claim 1 , wherein components of said rollover protection device are one of welded, screwed, and riveted to one another.

3. The rollover protection device according to claim 2 , wherein said components of said rollover protection device are formed from a material selected from the group consisting of metals, light metals and cast metals.

4. A rollover protection device disposed behind vehicle seats of a motor vehicle, being a convertible with a convertible top, the rollover protection device comprising:

at least one rollover protection cassette containing an extendible rollbar and a housing, said rollover protection cassette including an actuator for triggering said rollbar, one of said rollover protection cassette and said housing being a supporting component of a stiffening support being of multi-part construction and extending in a transverse direction of the motor vehicle; and

a plate-shaped stiffening element via which the rollover protection device is supported to a rear in a longitudinal direction of the motor vehicle.

5. The rollover protection device according to claim 1 , wherein at least one of said rollover protection cassettes or said housing thereof has a foot region joined to the supporting structure of the motor vehicle.

6. The rollover protection device according to claim 1 , wherein at least one of said two joining arms is configured such that said one joining arm is angled forward in a direction of travel and has an end facing away from the rollover protection cassette being joined to at least one of a B pillar, a convertible top bearing and a wheelhouse of the motor vehicle.

7. The rollover protection device according to claim 6 , wherein a region of said at least one joining arm which is angled forward in the direction of travel runs one of approximately horizontally and approximately obliquely downward and is joined to the B pillar in one of an upper region, a central region and a lower region thereof.

8. The rollover protection device according to claim 2 , wherein at least one of said components of said rollover protection device is an extruded profile.

9. The rollover protection device according to claim 4 , wherein said plate-shaped stiffening element is supported to the rear in the longitudinal direction of the motor vehicle against a convertible top store.

10. The rollover protection device according to claim 5 , wherein said foot region is joined to one of a seat trough and a crossmember of the motor vehicle.

11. A motor vehicle, comprising:

two rollover protection cassettes each containing an extendible rollbar and a housing, said rollover protection cassettes including an actuator for triggering said rollbar, one of said rollover protection cassettes and said housing being a supporting component of a stiffening support being of multi-part construction and extending in a transverse direction of the motor vehicle;

a connecting profile extending in the transverse direction of the motor vehicle and disposed between said two rollover protection cassettes; and

two joining arms via which said two rollover protection cassettes are joined to a supporting structure of the motor vehicle.