A river or tidal turbine for generating a minimum predetermined value of electricity from river current received at a harnessing module comprises a harnessing module, a control module and a generating module. Han's principle is that harnessed power from a river or tidal turbine must exceed a predetermined value of control power used by the turbine. Minimum power is lost in a three variable closed mechanical control system. The three variable closed mechanical system comprises a Hummingbird control assembly of first and second spur/helical gear assemblies which may be preferably mechanically simplified. The Hummingbird control, a control motor and a generator among other components may be mounted on a floating platform for delivery of constant power at constant frequency given sufficient input from a waterwheel harnessing module driven by river current flow in at least one direction. A tidal embodiment may comprise a moveable hatch for permitting the waterwheel to turn in foe same rotational direction regardless of direction of water current flow.

A river or tidal turbine for generating a minimum predetermined value of electricity from river current received at a harnessing module comprises a harnessing module, a control module and a generating module. Han's principle is that harnessed power from a river or tidal turbine must exceed a predetermined value of control power used by the turbine. Minimum power is lost in a three variable closed mechanical control system. The three variable closed mechanical system comprises a Hummingbird control assembly of first and second spur/helical gear assemblies which may be preferably mechanically simplified. The Hummingbird control, a control motor and a generator among other components may be mounted on a floating platform for delivery of constant power at constant frequency given sufficient input from a waterwheel harnessing module driven by river current flow in at least one direction. A tidal embodiment may comprise a moveable hatch for permitting the waterwheel to turn in foe same rotational direction regardless of direction of water current flow.

A torque load binder for changing tension in a chain or strap securing a load to a vehicle or support surface. The load binder includes a housing with an internal gear mechanism and a connector mechanism operatively engaged with the gear mechanism and extending outwardly from the housing. A high speed first driveshaft and a lower speed second driveshaft on the load binder are selectively individually actuated to effect movement between first and second end linkages of the connector mechanism. The first driveshaft effects movement between the first and second end linkages at a first speed and the second driveshaft effects movement between the end linkages at a lower second speed. Rotation of either of the first or second driveshafts actuates the connector mechanism, changing the distance between the first and second end linkages, and thereby changing the tension in the tie-down.

A torque load binder for changing tension in a chain or strap securing a load to a vehicle or support surface. The load binder includes a housing with an internal gear mechanism and a connector mechanism operatively engaged with the gear mechanism and extending outwardly from the housing. A high speed first driveshaft and a lower speed second driveshaft on the load binder are selectively individually actuated to effect movement between first and second end linkages of the connector mechanism. The first driveshaft effects movement between the first and second end linkages at a first speed and the second driveshaft effects movement between the end linkages at a lower second speed. Rotation of either of the first or second driveshafts actuates the connector mechanism, changing the distance between the first and second end linkages, and thereby changing the tension in the tie-down.

A telescopic adjuster including first and second linear actuators, a connecting platform and first and second telescopic levers is provided. The first linear actuator includes a first screw and a pair of first fixing rings. The first fixing rings are arranged at two respective ends of the first screw. The second linear actuator includes a second screw and a second fixing ring. The second fixing ring is arranged at the end of the second screw, relatively away from the connecting platform. The first and second linear actuators are arranged on the connecting platform in parallel. The first screw pushes the connecting platform to move along the first screw, and the first fixing rings limit a movement of the connecting platform. The first and second telescopic levers are coaxially arranged.

A transmission for a motor is provided, which optimizes a transmission for outputting a rotational force only in one direction at different shifting ratios according to forward/reverse rotation directions of a rotational shaft of the motor while enabling a reverse input, accurately transmits the rotational force without slippage and has durability even upon use thereof for a long period of time, thereby improving reliability and shifting accuracy and maximizing marketability and market competitiveness.

Provided are a linear driver for electric furniture and electric furniture. The linear driver for electric furniture includes a housing, a worm with one end extending into the housing, a worm wheel disposed in the housing and meshing with the worm, and a lead screw. The lead screw penetrates through the worm wheel and is in threaded connection with the worm wheel. At least one end of the lead screw extends out of the housing. At least one end of the worm wheel is provided with a guide structure. The guide structure is sleeved around the lead screw and is in clearance fit with the lead screw. The guide structure is fixed relative to the worm wheel or the housing.

Provided are a linear driver for electric furniture and electric furniture. The linear driver for electric furniture includes a housing, a worm with one end extending into the housing, a worm wheel disposed in the housing and meshing with the worm, and a lead screw. The lead screw penetrates through the worm wheel and is in threaded connection with the worm wheel. At least one end of the lead screw extends out of the housing. At least one end of the worm wheel is provided with a guide structure. The guide structure is sleeved around the lead screw and is in clearance fit with the lead screw. The guide structure is fixed relative to the worm wheel or the housing.

A gear change and gear change biasing mechanism for use in an automatic swimming pool cleaner.

A gear change and gear change biasing mechanism for use in an automatic swimming pool cleaner.