Hydraulic swimming pool cleaners with electricity generators

1. A method of generating electricity by an automatic swimming pool cleaner having a body including (i) an inlet for receiving water and (ii) an outlet, the method comprising:

a. placing the cleaner in fluid communication with a pump external to the cleaner; and

b. operating the pump so as to cause water to flow through a valve positioned in a first water flow path between the inlet and the outlet of the body, cooperation of the valve and pump resulting in oscillatory movement of a magnet positioned in a second water flow path of the body to generate electricity in a coil that is stationary relative to the body.

2. A method according to claim 1 further comprising causing the generated electricity to be conveyed to an electric device for operation thereof.

3. A method according to claim 2 in which the electric device is on-board the cleaner.

4. A method according to claim 3 in which the electric device affects movement or steering of the cleaner within a swimming pool containing debris-laden water.

5. A method according to claim 2 in which the electric device is remote from the cleaner.

6. A method according to claim 5 in which the electric device affects movement or steering of the cleaner within a swimming pool containing debris-laden water.

7. A method according to claim 1 in which the cleaner is placed in fluid communication with an inlet of the pump and debris-laden water is drawn through the valve when the pump is operated.

8. An automatic swimming pool cleaner comprising:

a. a body (i) comprising a water inlet and a water outlet and (ii) defining (A) primary and secondary flow paths therethrough and (B) upper and lower sections;

b. a valve forming part of the primary flow path, at least a portion of the upper section being upstream of the valve;

c. a connector (i) allowing fluid communication between the upper and lower sections and (ii) defining at least part of the secondary flow path; and

d. means, comprising (i) a magnet positioned in the connector and configured for oscillatory movement in the secondary flow path and (ii) a coil (A) stationary relative to the body and (B) cooperating with the magnet, for generating electricity upon oscillatory movement of the magnet in the secondary flow path.

9. A cleaner according to claim 8 in which the valve has an interior forming part of the primary flow path.

10. A cleaner according to claim 9 in which the valve has a wall configured to flex in use so as periodically to restrict passage of water through the primary flow path.

11. A cleaner according to claim 8 in which the valve (a) has an interior and (b) connects to the lower section so as to isolate the secondary flow path from the inlet except indirectly via the interior of the valve.

12. An automatic swimming pool cleaner comprising:

a. a body (i) comprising (A) a water inlet and (B) a water outlet and (ii) defining (A) primary and secondary flow paths therethrough, (B) an upper section, and (C) a lower section;

b. a valve (i) having an interior forming part of the primary flow path, (ii) having a wall configured to flex in use so as periodically to restrict passage of water through the primary flow path, and (iii) connected to the lower section so as to isolate the secondary flow path from the inlet except indirectly via the interior of the valve;

c. a connector (i) allowing fluid communication between the upper and lower sections and (ii) defining at least part of the secondary flow path;

d. a magnet (i) positioned within the connector and (ii) configured for oscillatory movement in the secondary flow path; and

e. a coil (i) positioned outside the connector and stationary relative to the body and (ii) configured to cooperate with the magnet so as to generate electricity when the magnet moves in the secondary flow path.

13. A method according to claim 1 in which the magnet is disconnected from the valve.