The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 24, 1984
Filed:
Nov. 09, 1981
Walter T Selsted, Cupertino, CA (US);
Arneson Products, Inc., Corte Madera, CA (US);
Abstract
A positive buoyancy programmed motion pool cleaning device is adapted for operation under a floating pool cover. The pool cleaning device is given positive buoyancy with floats fore and aft, both floats being adapted to provide positive buoyancy towards the pool cover while riding on an upper water bearing against the under surface of the pool cover. In this adaptation each float defines a concavity having a circumscribing annulus. At the interior of the concavity there is an outlet of a high volume, low pressure jet pump. Typically the high volume, low pressure jet pump includes a low volume, high pressure jet entraining and expanding water flow from beneath the floats through and elongate tube up, to, and discharging within the concavity. Preferably, the concavity and pump outlet are arranged with the pump outlet somewhat off center of the annulus walls so that pool cover plugging of the pump outlet does not occur. In operation, the concavity forms a water bearing pressure pocket. The pressure within this pocket is sufficient to provide positive fluid force lifting the cover. Reactive forces on the floating pool cleaning device place a force opposing the buoyant force on the pool cleaning device float. Travel of the float a sufficient distance under the cover results so that a fluid bearing exists between the float and cover at all times. The resultant fluid bearings provide a high lubricity interface permitting the programmed motion of pool cleaning device to continue without significant friction with the cover interrupting operation.