US4494257A — Flow control device

Claim 1

Independent Claim 170 words

A skimming device for removing water from the surface of a swimming pool, said pool including a gutter conduit having a trough disposed at an elevation lower than the normal level of the water in the pool, said gutter having a pool-side wall with an upper edge disposed above the normal level of the water in the pool, the device comprising: a housing in said gutter wall defining a flow passage with an inlet opening into the pool and an outlet opening into the gutter trough, said passage having a downwardly-inclined portion adjacent to said outlet; and a plate pivotally disposed within said inclined portion of the passage such that under its own weight the lower edge of the plate contacts the lower surface of said passage a control the flow through said passage, said plate responsive to the level of water within the trough to reduce flow through said passage and to stop flow through said passage when the level of water in the trough exceeds a predetermined height.

Claim 2

Dependent Claim 170 words

A skimming device for removing water from the surface of a swimming pool, said pool including a gutter conduit having a trough disposed at an elevation lower than the normal level of the water in the pool, said gutter having a pool-side wall with an upper edge disposed above the normal level of the water in the pool, the device comprising: a housing in said gutter wall defining a flow passage with an inlet opening into the pool and an outlet opening into the gutter trough, said passage having a downwardly-inclined portion adjacent to said outlet; and a plate pivotally disposed within said inclined portion of the passage such that under its own weight the lower edge of the plate contacts the lower surface of said passage a control the flow through said passage, said plate responsive to the level of water within the trough to reduce flow through said passage and to stop flow through said passage when the level of water in the trough exceeds a predetermined height.

Claim 3

Dependent Claim 37 words

A skimming device as set forth in claim 1, wherein said plate is pivotally disposed at an angle relative to a vertical axis through said inclined portion of the flow passage with the plate closing the passage.

Claim 4

Dependent Claim 22 words

A skimming device as set forth in claim 1, wherein said passage further includes a substantially horizontally-disposed portion adjacent to said inlet.

Claim 5

Dependent Claim 36 words

A skimming device as set forth in claim 1, wherein said flow passage is formed by the upper and lower surfaces of said housing, and said housing further includes end surfaces to form an enclosing chamber.

Claim 6

Dependent Claim 54 words

A skimming device as set forth in claim 4, wherein said upper and lower housing surfaces each are configured to have a substantially horizontal portion disposed adjacent to the inlet opening and an inclined portion disposed adjacent to the outlet opening, and are disposed in a spaced, parallel relationship to define said flow passage.

Claim 7

Dependent Claim 34 words

A skimming device as set forth in claim 5, wherein the inlet of said flow passage is provided with a cover perforated to permit controlled flow of water into said passage from the pool.

Claim 8

Dependent Claim 42 words

A skimming device as set forth in claim 5, wherein said plate is pivotal about an upper edge and the lower edge of said plate cooperates with the inclined portion of said lower housing surface to control water flow through said passage.

Claim 9

Dependent Claim 39 words

A skimming device as set forth in claim 5, wherein the inclined portion of each of said upper and lower housing surfaces is oriented at a predetermined angle relative to the substantially horizontal portion of each of said surfaces.

Claim 10

Independent Claim 215 words

A system for removing the water from the surface of a swimming pool comprising, in combination: a conduit for disposition about the perimeter of the swimming pool and adapted to carry water at a level below a predetermined level of water in the pool; a retaining wall on the pool side of said conduit, the upper edge of said wall being disposed above the predetermined level of water in the pool, over which edge water may flow from the pool into said conduit; and a skimming device having an inlet opening in said retaining wall disposed below the upper edge of said wall, at substantially the predetermined level of water in the pool; a housing defining a flow passage from said inlet to an outlet opening into said conduit, said passage having a downwardly-inclined portion adjacent to said outlet; and a plate pivotally disposed within said inclined portion of the passage such that under its own weight the lower edge of the plate contacts the lower surface of said passage to control the flow of water through said passage, said plate responsive to the level of water within said conduit to reduce flow through the passage and to stop flow through the passage when the level of water in said conduit exceeds a predetermined height.

Claim 11

Independent Claim 215 words

A system for removing the water from the surface of a swimming pool comprising, in combination: a conduit for disposition about the perimeter of the swimming pool and adapted to carry water at a level below a predetermined level of water in the pool; a retaining wall on the pool side of said conduit, the upper edge of said wall being disposed above the predetermined level of water in the pool, over which edge water may flow from the pool into said conduit; and a skimming device having an inlet opening in said retaining wall disposed below the upper edge of said wall, at substantially the predetermined level of water in the pool; a housing defining a flow passage from said inlet to an outlet opening into said conduit, said passage having a downwardly-inclined portion adjacent to said outlet; and a plate pivotally disposed within said inclined portion of the passage such that under its own weight the lower edge of the plate contacts the lower surface of said passage to control the flow of water through said passage, said plate responsive to the level of water within said conduit to reduce flow through the passage and to stop flow through the passage when the level of water in said conduit exceeds a predetermined height.

Claim 12

Dependent Claim 26 words

A system as set forth in claim 9, wherein the flow passage in said skimming device further includes a substantially horizontally-disposed portion adjacent to said inlet.

Claim 13

Dependent Claim 26 words

A system as set forth in claim 10, wherein the inclined portion of the passage is disposed at a predetermined angle relative to the horizontally-disposed portion.

Claim 14

Dependent Claim 41 words

A system as set forth in claim 11, wherein said housing comprises parallel-disposed upper and lower surfaces and parallel-disposed end surfaces joined to said upper and lower surfaces and said flow passage is defined within said housing by said adjoined surfaces.

Claim 15

Dependent Claim 45 words

A system as set forth in claim 12, wherein said upper and lower surfaces are each formed with a horizontally-disposed portion adjacent the inlet and a downwardly-inclined portion adjacent the outlet, said inclined portion being disposed at a predetermined angle relative to said horizontal portion.

Claim 16

Dependent Claim 36 words

A system as set forth in claim 13, wherein said plate is disposed to pivot substantially about the upper edge and coacts with the inclined portion of said lower surface to control flow through said passage.

Claim 17

Dependent Claim 51 words

A system as set forth in claim 12, including a perforated cover for said inlet, the mid-height of said perforations being disposed substantially at the predetermined level of water in the pool, said perforations functioning as weirs to accelerate the flow of the surface layer of pool water into said passage.

Claim 18

Dependent Claim 25 words

A system as set forth in claim 12, further including a second conduit disposed adjacent to said conduit to provide water to the swimming pool.

Claim 19

Dependent Claim 52 words

A system as set forth in claim 16, wherein said second conduit is an enclosed conduit having a pool-side wall forming said retaining wall and an upper surface over which water may flow from the pool into said conduit, and said housing is disposed in a cutout provided in said second conduit.

Claim 20

Dependent Claim 29 words

A system as set forth in claim 17, wherein the upper surface of said housing conforms to and is substantially flush with the external shape of said second conduit.

Claim 21

Dependent Claim 181 words

In combination, a swimming pool having generally vertical walls to contain a body of water to a predetermined height; a first conduit disposed about the upper periphery of said walls and adapted to carry water at a level lower than the level of water in the pool; a pool-side wall of said first conduit having an edge disposed above the predetermined height of water in the pool, over which edge water may flow from the pool into said first conduit; and a skimming device having a flow passage with an inlet opening into the pool-side wall of said first conduit, at a level substantially equal to the predetermined height of water in the pool, and an outlet opening into said first conduit, said passage having a downwardly-inclined portion adjacent to said outlet, and a plate pivotally disposed within said inclined portion of the passage to have its lower edge contact under the plate's own weight the lower surface of the passage and responsive to the level of water in said first conduit to control the flow of water through said passage.

Claim 22

Dependent Claim 181 words

In combination, a swimming pool having generally vertical walls to contain a body of water to a predetermined height; a first conduit disposed about the upper periphery of said walls and adapted to carry water at a level lower than the level of water in the pool; a pool-side wall of said first conduit having an edge disposed above the predetermined height of water in the pool, over which edge water may flow from the pool into said first conduit; and a skimming device having a flow passage with an inlet opening into the pool-side wall of said first conduit, at a level substantially equal to the predetermined height of water in the pool, and an outlet opening into said first conduit, said passage having a downwardly-inclined portion adjacent to said outlet, and a plate pivotally disposed within said inclined portion of the passage to have its lower edge contact under the plate's own weight the lower surface of the passage and responsive to the level of water in said first conduit to control the flow of water through said passage.

Claim 23

Dependent Claim 21 words

A combination as set forth in claim 19, wherein said passage further includes a substantially horizontally-disposed portion adjacent to said inlet.

Claim 24

Dependent Claim 75 words

A combination as set forth in claim 20, wherein said skimming device includes a housing having generally parallel, spaced upper and lower surfaces and end surfaces adjoined to define said flow passage, each of said upper and lower surfaces having a substantially horizontal portion disposed adjacent to the inlet opening and an inclined portion disposed at a predetermined angle relative to said horizontal portion to form said respective horizontal and inclined portions of said passage.

Claim 25

Dependent Claim 38 words

A combination as set forth in claim 21, wherein said plate is pivotal substantially about an upper edge and coacts with the inclined portion of said lower housing surface to control the flow of water through the passage.

Claim 26

Dependent Claim 55 words

A combination as set forth in claim 22, wherein said housing further includes a perforated cover over said inlet, the mid-height of the perforations being disposed substantially at the predetermined level of water in the pool, said perforations functioning as weirs to accelerate the flow of the surface layer of pool water into said passage.

Claim 27

Dependent Claim 26 words

A combination as set forth in claim 22, further including a second, enclosed conduit disposed adjacent to said first conduit to provide water to the pool.

Claim 28

Dependent Claim 84 words

A combination as set forth in claim 24, said second conduit having a pool-side wall forming a retaining wall for the water in the pool and a top wall disposed above the predetermined height of the water in the pool, over which top wall water may flow from the pool to said first conduit, and said skimmer housing is disposed in a cutout provided in said second conduit, the external configuration of said housing being complementary with the external configuration of said second conduit.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1988-01-22	1988-07-23	1989-01-22	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1992-01-22	1992-07-23	1993-01-22	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1996-01-22	1996-07-23	1997-01-22	$7700.00	Window Closed / Lapsed

Flow control device

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