Automatic swimming pool cleaners especially adept at climbing and cleaning pool stairs

1. An automatic swimming pool cleaner comprising:

a. a generally-cylindrical body having a central axis, wherein the central axis of the generally-cylindrical body is in a horizontal direction;

b. motive elements configured to cause movement of the body in a swimming pool; and

c. a brush adjacent the generally-cylindrical body, wherein the brush comprises an axis of rotation extending parallel to the central axis of the generally-cylindrical body.

2. An automatic swimming pool cleaner according to claim 1 further comprising a filter assembly (i) configured for placement wholly or partly within the body and (ii) comprising telescoping layers of filtration material.

3. An automatic swimming pool cleaner comprising:

a body defining an inlet for receiving debris-laden water of a swimming pool;

a filter assembly:

a. positioned at least partially within the body; and

b. comprising telescoping layers of filtration material configured to be nested in use and extended for cleaning; and

a pump configured to exhaust filtered water out a side of the automatic swimming pool cleaner and relative to a direction of movement of the automatic swimming pool cleaner.

4. The automatic swimming pool cleaner according to claim 3 in which a first layer of the telescoping layers initially encountering debris-laden water in use filters particles of a first size and a second layer of the telescoping layers subsequently encountering the debris-laden water in use filters particles of a second size smaller than the first size.

5. An automatic swimming pool cleaner comprising:

a. a body defining an inlet for receiving debris-laden water of a swimming pool;

b. motive elements configured to drive the body in a first direction on a surface of the swimming pool;

c. a filter positioned wholly or partly within the body; and

d. a first pump configured to exhaust filtered water at (i) a first angle relative to the first direction and (ii) a second angle relative to the surface, with each of the first and second angles being none of 0°, 90°, or 180°, wherein the first pump is configured to exhaust the filtered water outside of the motive elements in a lateral direction.

6. An automatic swimming pool cleaner according to claim 5 further comprising a second pump configured to exhaust filtered water at (i) a third angle relative to the first direction and (ii) a fourth angle relative to the surface, with each of the third and fourth angles being none of 0°, 90°, or 180°.

7. An automatic swimming pool cleaner according to claim 6 in which the second pump is configured to be controlled independently of the first pump.

8. An automatic swimming pool cleaner according to claim 7 in which the body comprises a first end region and a second end region opposite the first end region, with the first pump being located in the first end region and the second pump being located in the second end region.

9. An automatic swimming pool cleaner comprising:

a. a body comprising:

i. an inlet;

ii. a first end region; and

iii. a second end region opposite the first end region, wherein the first end region and the second end region are arranged in a side-to-side direction relative to a direction of movement of the automatic swimming pool cleaner;

b. a first pump:

i. configured to exhaust water received through the inlet; and

ii. located in the first end region; and

c. a second pump:

i. configured to exhaust water received through the inlet;

ii. located in the second end region; and

iii. configured to be controlled independently of the first pump.

10. An automatic swimming pool cleaner according to claim 9 further comprising:

d. a first motive element located in the first end region;

e. a second motive element located in the second end region;

f. a first handle located in the first end region; and

g. a second handle located in the second end region.

11. The automatic swimming pool cleaner comprising of claim 9 , wherein the first end region further comprises a first drive motor and the second end region further comprises a second drive motor.

12. An automatic swimming pool cleaner comprising a body, the body comprising:

i. an inlet;

ii. a first end region containing a first motive element and a first pump configured to exhaust water received through the inlet to an exterior of the first motive element; and

iii. a second end region opposite the first end region and such that the first region and the second region are arranged in a side-to-side direction relative to a direction of movement of the automatic swimming pool cleaner, the second end region containing a second motive element and a second pump configured to exhaust water received through the inlet to an exterior of the second motive element.

13. The automatic swimming pool cleaner comprising of claim 12 , wherein the first end region further comprises a first drive motor and the second end region further comprises a second drive motor.

14. An automatic swimming pool cleaner comprising:

a body defining an inlet for receiving water of a swimming pool;

motive elements at opposing ends of the body and configured to move the body along a surface of a swimming pool; and

outlets for exhausting the water from the body, wherein the motive elements are between the outlets and the body.

15. An automatic swimming pool cleaner comprising:

a. a generally-cylindrical body;

b. motive elements configured to cause movement of the body in a swimming pool;

c. a brush adjacent the generally-cylindrical body; and

d. a filter assembly (i) configured for placement wholly or partly within the body and (ii) comprising telescoping layers of filtration material.