Roller

1. A roller ( 1 ), having a wheel ( 2 ) and a locking device, an activating part ( 10 ) acting on an engagement part ( 18 ) of the locking device for releasing or locking the wheel ( 2 ) about an axis x, and the activating part ( 10 ) being movable by a drive, a movement of a transmission part ( 7 ) between a locking position and a release position, that is generated by said drive being transmitted only via spring force to the activating part ( 10 ) for moving the activating part, and

a spring having an underside, and the underside of the spring is supported in a first support region on the transmission part, wherein a second support region for the spring is formed on the activating part ( 10 ), through which second support region the transmission part ( 7 ) passes only due to compression of the spring when moved from the locking position to the release position or vice versa.

2. The roller according to claim 1 , wherein the spring ( 8 , 9 , 44 ) can be lifted off from the first support region on the transmission part ( 7 ).

3. The roller according to claim 2 , wherein the spring ( 8 , 9 , 44 ) can be lifted off upwardly from the first support region.

4. The roller according to claim 2 , wherein the first support region comprises an upper support region for the spring ( 8 , 9 , 44 ) formed on the transmission part ( 7 ) and wherein the spring ( 8 , 9 , 44 ) can be lifted off downwardly from the upper support region.

5. The roller according to claim 1 , wherein the spring ( 8 , 9 , 44 ) can be lifted off from the second support region on the activating part ( 10 ) by means of the transmission part ( 7 ).

6. The roller according to claim 1 , wherein the transmission part ( 7 ) is disposed within the activating part ( 10 ).

7. The roller according to claim 1 , wherein the roller has the two springs and that at least one of the two springs ( 8 , 9 , 44 ) is situated outside the transmission part ( 7 ).

8. The roller according to claim 7 , wherein the two springs ( 8 , 9 ) are situated outside the transmission part ( 7 ).

9. The roller according to claim 1 , wherein the spring ( 8 , 9 , 44 ) can be lifted off upwardly from the second support region.

10. A roller ( 1 ), having a wheel ( 2 ) and a locking device, an activating part ( 10 ) acting on an engagement part ( 18 ) of the locking device for releasing or locking, and the activating part ( 10 ) being movable by a drive, a movement of a transmission part ( 7 ) that is generated by said drive being transmitted via spring force to the activating part ( 10 ) for moving the activating part, and a spring ( 8 , 9 , 44 ) being supported on the transmission part, wherein a support region for the spring ( 8 , 9 , 44 ) is formed on the activating part ( 10 ), through which region the transmission part ( 7 ) passes; and

wherein the activating part ( 10 ) forms a lower central chamber which is open at the bottom and in which the spring ( 8 , 9 , 44 ) is accommodated.

11. A roller ( 1 ), having a wheel ( 2 ) and a locking device, an activating part ( 10 ) acting on an engagement part ( 18 ) of the locking device for releasing or locking, and the activating part ( 10 ) being movable by a drive, a movement of a transmission part ( 7 ) that is generated by said drive being transmitted via spring force to the activating part ( 10 ) for moving the activating part, and a spring ( 8 , 9 , 44 ) being supported on the transmission part, wherein a support region for the spring ( 8 , 9 , 44 ) is formed on the activating part ( 10 ), through which region the transmission part ( 7 ) passes; and

wherein the activating part ( 10 ) acts on the engagement part by means of an intermediate part acting as a spring, wherein the intermediate part is pivotably mounted in the wheel for movement between an engagement position and a release position.

12. The roller according to claim 11 , wherein the intermediate part moves the engagement part into the release position.

13. A roller ( 1 ), having a wheel ( 2 ) and a locking device, an activating part ( 10 ) acting on an engagement part ( 18 ) of the locking device for releasing or locking the wheel ( 2 ) about an axis x, and the activating part ( 10 ) being movable by a drive, a movement of a transmission part ( 7 ) that is generated by said drive being transmitted via spring force to the activating part ( 10 ) for moving the activating part, and

a spring ( 8 , 9 , 44 ) having an underside, and the underside of the spring is supported on the transmission part, wherein a support region for the spring ( 8 , 9 , 44 ) is formed on the activating part ( 10 ), through which region the transmission part ( 7 ) passes when moved from a locking position to a release position or vice versa;

wherein for carrying out an emergency release, the activating part ( 10 ) is actuated by means of a handle ( 11 ) acting on the activating part, which handle is accessible from the outside.

14. The roller according to claim 13 , wherein the handle ( 11 ) moves together with the activating part ( 10 ).

15. The roller according to claim 13 , wherein the handle ( 11 ) is fixedly connected to the activating part ( 10 ).

16. The roller according to claim 13 , wherein the activating part ( 10 ) can be moved relative to the stationary transmission part ( 7 ) by means of the handle ( 11 ).

17. The roller according to claim 16 , wherein the movement of the activating part ( 10 ) takes place relative to the stationary transmission part ( 7 ) while carrying along the support region for the spring ( 8 , 9 , 44 ).

18. The roller according to claim 13 , wherein the handle ( 11 ) can be moved relative to a stationary abutment ( 12 , 13 ) within the roller.

19. A roller ( 1 ), having a wheel ( 2 ) and a locking device, an activating part ( 10 ) acting on an engagement part ( 18 ) of the locking device for releasing or locking the wheel ( 2 ) about an axis x, and the activating part ( 10 ) being movable by a drive, a movement of a transmission part ( 7 ) that is generated by said drive being transmitted via spring force to the activating part ( 10 ) for moving the activating part, and a spring ( 8 , 9 , 44 ) being supported on the transmission part, wherein a support region for the spring ( 8 , 9 , 44 ) is formed on the activating part ( 10 ), through which region the transmission part ( 7 ) passes when moved from a locking position to a release position or vice versa; and

wherein the spring comprises only one spring ( 8 , 9 , 44 ) between the transmission part ( 7 ) and the activating part ( 10 ).

20. The roller according to claim 19 , wherein the only one spring is supported on the transmission part ( 7 ) and the activating part ( 10 ).