The drive unit is designed to be mounted on a marine vessel, including a mobile housing, and is able to pivot around an axis against the hull of the marine vessel. A drive shaft mounted rotary is against the mobile housing and is supported by two roller bearings. A propulsion element rotates in solidarity with the drive shaft. The propulsion unit has, at the front, at least two braking and locking systems of the drive shaft located in an area between the upstream rolling bearing and propulsion element.

The disclosure relates to a frictionally locking arrangement for a drive, which drive has an advancing gear mechanism, the frictionally locking arrangement having a carrier and at least one frictionally locking unit. In some embodiments at least one frictionally locking unit has a frictionally locking lever which is mounted with a first lever end pivotably on the carrier, which frictionally locking lever, on a first lever section which is spaced apart from the first lever end, has a force introduction device which is mounted on the carrier and is configured to introduce a force into the frictionally locking lever in a manner which is spaced apart from the first lever end, and which frictionally locking lever, on a second lever section which is arranged between the first lever end and the first lever section, has a first frictional element.

A torque transfer apparatus and method of use is described. The apparatus (60) comprises a plurality of elements (62) assembled together to form a ring structure oriented in a plane around a longitudinal axis. The ring structure defines a first engagement surface. A structure (56) defining a second engagement surface is rotatable with respect to the ring structure. The ring structure is operable to be moved between a collapsed condition and an expanded condition by movement of the plurality of elements, and movement between the collapsed condition and the expanded condition engages or disengages the first and second engagement surfaces. The apparatus can be configured to transfer a driving torque (e.g. a clutch) or a braking force (e.g. a torque brake).

The drive unit is designed to be mounted on a marine vessel, including a mobile housing, and is able to pivot around an axis against the hull of the marine vessel. A drive shaft mounted rotary is against the mobile housing and is supported by two roller bearings. A propulsion element rotates in solidarity with the drive shaft. The propulsion unit has, at the front, at least two braking and locking systems of the drive shaft located in an area between the upstream rolling bearing and propulsion element.

The drive unit is designed to be mounted on a marine vessel, including a mobile housing, and is able to pivot around an axis against the hull of the marine vessel. A drive shaft mounted rotary is against the mobile housing and is supported by two roller bearings. A propulsion element rotates in solidarity with the drive shaft. The propulsion unit has, at the front, at least two braking and locking systems of the drive shaft located in an area between the upstream rolling bearing and propulsion element.

A digital microscope includes a stationary stand body (12) and a pivot unit (14) mounted on a shaft (24) of the stand body (12), pivotably about a longitudinal axis (26) of the shaft (24). The pivot unit (14) has an image sensing unit for acquiring images of objects to be examined microscopically. Microscope (10) furthermore has a brake unit (22) for braking and/or immobilizing the pivot unit (14), the brake unit (22) including at least one brake element (32 to 38) biased by an elastic element (40) into a braked position. Microscope (10) includes an actuation element (44) for releasing the brake unit (22), the brake element (32 to 38) being movable by manual actuation of the actuation element (44), against return force of the elastic element (40), from the braked position into a released position, and the actuation element (44) being coupled to the brake element (32 to 38).

A digital microscope includes a stationary stand body (12) and a pivot unit (14) mounted on a shaft (24) of the stand body (12), pivotably about a longitudinal axis (26) of the shaft (24). The pivot unit (14) has an image sensing unit for acquiring images of objects to be examined microscopically. Microscope (10) furthermore has a brake unit (22) for braking and/or immobilizing the pivot unit (14), the brake unit (22) including at least one brake element (32 to 38) biased by an elastic element (40) into a braked position. Microscope (10) includes an actuation element (44) for releasing the brake unit (22), the brake element (32 to 38) being movable by manual actuation of the actuation element (44), against return force of the elastic element (40), from the braked position into a released position, and the actuation element (44) being coupled to the brake element (32 to 38).

A digital microscope has a stationary stand body (12) and a pivot unit (14) pivotably mounted on the stand body (12). The pivot unit (14) includes an image sensing unit for acquiring images of objects. The microscope has a brake unit (22) for braking and/or immobilizing the pivot unit (14), and an actuation element (44) for releasing the brake unit (22). The pivot unit (14) includes a first connecting element (60) and the stand body (12) has a second connecting element (62). The first and second connecting elements (60, 62) are coupled to one another when the pivot unit (14) is in a predetermined zero position and the actuation element (44) is in an unactuated default position. The connecting elements (60, 62) are moreover coupled to one another when the pivot unit (14) is in the zero position and the actuation element (44) is actuated within a predetermined actuation range.

A digital microscope includes a stationary stand body (12) and a pivot unit (14) that is mounted on a shaft (24) of the stand body (12), pivotably around the longitudinal axis (26) of the shaft (24). The pivot unit (14) includes an image sensing unit for acquiring images of objects to be examined microscopically. The microscope (10) further has a brake unit (22) for braking and/or immobilizing the pivot unit (14), and an actuation element (44) for releasing the brake unit (22). Also provided is an elastic element (82) that, upon pivoting of the pivot unit (14) out of a predetermined zero position, exerts a return moment (M.sub.R) on the pivot unit (14), the return moment (M.sub.R) being directed against a tangential moment (M.sub.T) brought about by the weight (G) of the pivot unit (14).