Rotating spinkler having magnetic coupling elements for transmitting motion

A sprinkler comprising:

• a liquid inlet;
• a liquid outlet rotatable with respect to said liquid inlet;
• and
• apparatus, driven by a pressurized flow of liquid entering said liquid inlet, for rotating said liquid outlet, said apparatus including a magnetic coupling for transmitting motion, wherein the magnetic coupling comprises at least one rotating driving magnet and wherein said apparatus for rotating is not engaged until said at least one rotating driving magnet is rotating at a predetermined minimum rate of rotation.

A sprinkler comprising:

• a liquid inlet;
• a liquid outlet rotatable with respect to said liquid inlet;
• and
• apparatus, driven by a pressurized flow of liquid entering said liquid inlet, for rotating said liquid outlet, said apparatus including a magnetic coupling for transmitting motion, and wherein said magnetic coupling comprises first and second pairs of magnetic coupling elements and further comprising:
• a gear train located in a watertight sealed section of said sprinkler and comprising a plurality of gears, including:
• a first gear, mechanically driven by said first pair of magnetic coupling elements;
• and
• a last gear, mechanically driving said liquid outlet via said second pair of magnetic coupling elements.

A sprinkler comprising:

• a liquid inlet;
• a liquid outlet rotatable with respect to said liquid inlet;
• and
• apparatus, driven by a pressurized flow of liquid entering said liquid inlet, for rotating said liquid outlet, said apparatus including a magnetic coupling for transmitting motion, wherein the magnetic coupling comprises at least one driving magnet and at least one driven magnet driven by said at least one driving magnet but not in physical contact therewith, and wherein said said at least one driving magnet and said at least one driven magnet are arranged to exert a repelling force on each other.

A sprinkler comprising:

• a liquid inlet;
• a liquid outlet rotatable with respect to said liquid inlet;
• and
• apparatus, driven by a pressurized flow of liquid entering said liquid inlet, for rotating said liquid outlet, said apparatus including a magnetic coupling for transmitting motion, wherein the magnetic coupling comprises at least one driving magnet and at least one driven magnet driven by said at least one driving magnet but not in physical contact therewith, and wherein rotation of said at least one driving magnet exerts a force on said at least one driven magnet only during a portion of the rotation thereof.

A sprinkler comprising:

• a liquid inlet;
• a liquid outlet rotatable with respect to said liquid inlet;
• and
• apparatus, driven by a pressurized flow of liquid entering said liquid inlet, for rotating said liquid outlet, said apparatus including a magnetic coupling for transmitting motion, and wherein the magnetic coupling comprises:
• a rotating driving magnet;
• and
• a rotatable driven magnet coupled to said liquid outlet, whereby said driving magnet and said driven magnet are close enough to interact only as said driving magnet rotates past said driven magnet,
• wherein the inertia of said driven magnet and said liquid outlet are such that as said rotating driving magnet rotates past said driven magnet in propinquity thereto, the force exerted by said rotating magnet on said driven magnet is sufficient to move said driven magnet a short distance.