Patent ID: 8561495

Claim:
A gear unit having: a drive element with a first tooth structure, an output element with a second tooth structure, wherein the tooth structures are able to be brought in engagement cogging with each other to form a gearing in at least one engagement area of the second tooth structure, wherein the output element has at least one uncoupling area, in which the cogging engagement of the gearing is uncoupled, wherein the first tooth structure has at least one first modified tooth element and wherein the second tooth structure has at least one second modified tooth element, wherein by a movement of the drive element, synchronization of the second modified tooth element with the first modified tooth element is enabled in order to create a change from the uncoupled state to the engagement state, wherein the second tooth structure has at least one lengthened tooth element with an enlarged length, which is greater than a smaller length of the rest of the second tooth structure, wherein the first modified tooth element of the first tooth structure has an enlarged length, that is greater than a smaller length of the majority of the first tooth structure, and a blocking element whereby the output element is blocked in the uncoupled state and the gear unit is configured to be self-locking, wherein the blocking element further includes a blocking surface and the blocking element is disposed adjacent the first tooth structure and arranged on the drive element.