An antenna transmission apparatus includes: a housing including an upper cover and a lower cover, and an input shaft and at least two sets of output shafts that are rotatably mounted between the upper cover and the lower cover; and further includes a planetary gear position selection assembly and a unidirectional control assembly. Each set of output shafts includes an output shaft and an auxiliary shaft in transmission fit with the output shaft; the planetary gear position selection assembly includes a planetary gear; the unidirectional control assembly can control the planetary gear to implement position selection and positioning; and the position selection and bidirectional rotation output of the output shafts may be implemented by using only one motor. The antenna transmission apparatus of the present invention is simple in structure, light in weight, stable, and easy to operate.

An antenna transmission apparatus includes: a housing including an upper cover and a lower cover, and an input shaft and at least two sets of output shafts that are rotatably mounted between the upper cover and the lower cover; and further includes a planetary gear position selection assembly and a unidirectional control assembly. Each set of output shafts includes an output shaft and an auxiliary shaft in transmission fit with the output shaft; the planetary gear position selection assembly includes a planetary gear; the unidirectional control assembly can control the planetary gear to implement position selection and positioning; and the position selection and bidirectional rotation output of the output shafts may be implemented by using only one motor. The antenna transmission apparatus of the present invention is simple in structure, light in weight, stable, and easy to operate.

A drive unit includes a wheel distribution gear mechanism for pivoting, for example, blades of an air vent for guiding an air current out of the air vent into a passenger compartment of a motor vehicle. So as to be able to determine a rotational position of an output wheel of the wheel distribution gear mechanism, for example after a power failure, without a sensor, the invention provides a non-rotation block, which, when the wheel distribution gear mechanism is rotationally driven, reaches a blocking position in which this blocks the output wheel in a defined rotational position to prevent further rotation.

A drive unit includes a wheel distribution gear mechanism for pivoting, for example, blades of an air vent for guiding an air current out of the air vent into a passenger compartment of a motor vehicle. So as to be able to determine a rotational position of an output wheel of the wheel distribution gear mechanism, for example after a power failure, without a sensor, the invention provides a non-rotation block, which, when the wheel distribution gear mechanism is rotationally driven, reaches a blocking position in which this blocks the output wheel in a defined rotational position to prevent further rotation.

A microtome has first and second shafts at different fixed positions, wherein the first shaft may be rotated by a hand wheel. The shafts carry first and second gear wheels, respectively. A transmission unit couples the two gear wheels to each other so that the second shaft can be driven to rotate by the first shaft, and a shift unit for pivotably shifting the transmission unit between first and second positions. The two shafts rotate in the same direction when the transmission unit is in the first position, and in opposite directions when the transmission unit is in the second position. The transmission unit includes first and second idler gears meshing constantly with each other. The two shafts are coupled by only one of the idler gears when the transmission unit is in the first position, and by both idler gears when the transmission unit is in the second position.

A microtome has first and second shafts at different fixed positions, wherein the first shaft may be rotated by a hand wheel. The shafts carry first and second gear wheels, respectively. A transmission unit couples the two gear wheels to each other so that the second shaft can be driven to rotate by the first shaft, and a shift unit for pivotably shifting the transmission unit between first and second positions. The two shafts rotate in the same direction when the transmission unit is in the first position, and in opposite directions when the transmission unit is in the second position. The transmission unit includes first and second idler gears meshing constantly with each other. The two shafts are coupled by only one of the idler gears when the transmission unit is in the first position, and by both idler gears when the transmission unit is in the second position.

A Gear change and gear change biasing mechanism for use in an automatic swimming pool cleaner in slightly off-set paths to cover a mostly square area, a fourth larger turn 46 will steer cleaner to a different area of pool indicated by arrow 47 where the pattern will repeat itself.

A Gear change and gear change biasing mechanism for use in an automatic swimming pool cleaner in slightly off-set paths to cover a mostly square area, a fourth larger turn 46 will steer cleaner to a different area of pool indicated by arrow 47 where the pattern will repeat itself.