# US 4,393,528 A · Adjustable trampoline type pool and hot tub cover > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,393,528 A - Document ID: US4393528A - Status: Granted - Kind: A - Application number: 06/259,414 - Filed: 1981-05-01 - Granted: 1983-07-19 - Earliest claimed: 1981-05-01 - Inventors: Trent W. West - Web page: https://patentgrep.com/patent/US4393528A ## CPC - E04H 4/084: {with lifting mechanism} - E04H 4/10: Coverings of flexible material - E04H: BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL (foundations E02D) ## Abstract A cover for covering pools having a pool coping elevated a predetermined height above the surface area surrounding the pool. A pair of spaced apart hinges are mounted to a rigid support adjacent the pool. A hinge arm is pivotally mounted in each hinge for pivoting about a pivot axis. Each arm is capable of rotation through a predetermined angle of rotation from a plane that is substantiallay normal to the pivot axis. Each hinge arm includes a clamp within which a rigid planar hoop that circumscribes the pool is secured. The hinge arm has an axis and the clamp has an axis oriented a predetermined clamp angle away from the axis of the arm. A panel spanning the central interior area of the hoop is secured to the hoop. The clamp angle and the angle of rotation in combination allow for adjustment of the hoop in the clamp in accordance with the shape of said hoop and the presence and elevation of the pool coping such that when the panel covers the pool, the hoop lies in a horizontal plane. A resilient seal is attached to the one side of the panel for forming an air-tight seal with the panel such that when the panel covers the pool, the resilient seal contacts the surface area surrounding the pool for providing a substantially air-tight seal between the pool and the region enclosed by the cover. ## Claims ### Claim 1 A cover for covering pools comprising: at least one hinge for mounting to a rigid support adjacent the pool; a hinge arm pivotally mounted in such a hinge for pivoting between open and cover pool positions, the arm having an axis and first and second ends, the arm being pivotable at the first end thereof about a pivot axis defined in the hinge, the arm being capable of movement through a predetermined angle of rotation away from a plane that is substantially normal to the pivot axis; a clamp at the second end of the arm, the clamp having an axis oriented at a predetermined clamp angle relative to the axis of the arm; a hoop having a perimetral shape conforming to and circumscribing the pool, said hoop secured in the clamp, an interior hoop area being defined by the perimeter of the hoop; and a panel for covering the pool and secured to the hoop and spanning the interior hoop area thereof, the clamp angle and the angle of rotation of said hinge arm in combination allowing for adjustment of the hoop in the clamp in accordance with the shape of said hoop such that when the panel covers the pool the hoop lies in a horizontal plane. ### Claim 2 (depends on 1) The cover of claim 1 comprising a pair of said hinges spaced apart from one another, and a separate hinge arm pivotally mounted in each hinge, said hoop being secured in the clamps at the ends of the pair of arms. ### Claim 3 (depends on 2) The cover of claim 2 comprising a resilient seal located on one side of the panel adjacent the perimetral edge thereof and forming an air-tight seal therewith such that when the panel covers the pool the resilient seal contacts the area surrounding the pool and a substantially air-tight seal is provided between the pool and the region enclosed by the cover. ### Claim 4 (depends on 3) The cover of claim 3 wherein the resilient seal deforms upon contact with the area surrounding the pool for forming a seal therewith and wherein said resilient seal returns to its undeformed state upon removal of contact of the resilient seal with the area surrounding the pool. ### Claim 5 (depends on 4) The cover of claim 4 wherein the resilient seal is secured to the panel. ### Claim 6 (depends on 4) The cover of claim 4 wherein the resilient seal is detachably mounted to the hoop. ### Claim 7 (depends on 4) The cover of claim 4 wherein the resilient seal comprises an inflated tube encased within a hollow sleeve. ### Claim 8 (depends on 4) The cover of claim 4 wherein the resilient seal is formed of a solid unitary piece of flexible material. ### Claim 9 (depends on 2) The cover of claim 2 wherein each hinge comprises a substantially cylindrical hinge pin mounted therein, the hinge pin defining the pivot axis; and an annular generally spool shaped hinge grommet having an axial bore adapted for receiving the pin and being mounted thereon, said hinge grommet having annular inclined interior facing walls, said hinge arm being pivotable on the grommet, the hinge arm being capable of movement on the grommet such that contact of the hinge arm with the interior walls of the grommet defines the limits of the arc of rotation of the movement of the hinge arm in the hinge. ### Claim 10 (depends on 9) The cover of claim 9 wherein said inclined walls extend in opposite directions away from a plane that is located intermediate the hinge grommet axial bore and being normal thereto. ### Claim 11 (depends on 1) The cover of claim 1 wherein said panel is formed of nylon. ### Claim 12 (depends on 1) The cover of claim 1 wherein said panel is formed of polyester reinforced nylon coated fabric. ### Claim 13 (depends on 1) The cover of claim 1 comprising drainage means located in the panel for providing drainage for any water accumulating on the panel closed over the pool. ### Claim 14 (depends on 13) The cover of claim 13 wherein said drainage means comprises a grommet located substantially in the center of the panel, said grommet having an aperture that extends through the panel for conducting water accumulating on the panel into the pool. ### Claim 15 (depends on 1) The cover of claim 1 comprising means for locking said hoop in position while said panel is covering a pool. ### Claim 16 (depends on 1) The cover of claim 1 wherein said hoop is planar and rigid. ### Claim 17 (depends on 1) The cover of claim 1 wherein said pool has a coping being a predetermined height above the surface area surrounding the pool, the panel circumscribing the coping, the hoop being adjusted in the clamps in accordance with the height of the coping such that when the panel covers the pool, the panel lies on the upper extremities of the coping.