Graco Children's Products, Inc.

United Air Specialists, Inc.

Alan W Ball

Thomas B Green

Louis Robert Doucette

Thomas J Pollack

Thomas M Perrin

Kelly Kloster Hon

William Forbes

Christopher S Swain

A foldable stroller has a frame assembly with a fold joint, a fold joint, a handle push arm, a front leg with an upper end connected to the fold joint, a rear leg extending down from and pivotally connected to the fold joint, and a drive link. The drive link has a rear end pivotally coupled to the rear leg below the fold joint and a front end pivotally coupled to a lower end of the push arm. The frame assembly is reconfigurable between an unfolded and a folded configuration. In the folded configuration, the fold joint moves upward along the handle push arm. The rear end of the drive link and the rear leg are moved toward and lie closely adjacent the front leg and handle push arm. The frame assembly may automatically move to the folded and/or unfolded configuration. The foldable stroller may also stand upright in the folded configuration.

Foldable stroller and frame assembly

Shown is an apparatus and method for cleaning filter units of an air filtering system using a reverse flow pulse of pressurized air. The filter cleaning system includes a venturi element () with a narrowed throat portion (). A blowpipe () is substantially axially aligned with the venturi () and has an outlet nozzle () that is flared in a substantially conical shape with an included angle that () that exceeds an angle at () at which high pressure air would ordinarily diverge from an unmodified blowpipe opening. The nozzle () is axially spaced from the venturi at a selected distance () such that a high velocity pulse of air delivered by the blowpipe () through the nozzle () is delivered to the outlet portion () of the venturi () substantially between the outlet opening () and the throat (). This relationship provides a cleaning pulse of air that effectively completely chokes all forward movement of air flow through the venturi () and delivers a pulse wave of high pressure, high velocity air along substantially the full length of the tubular filter element ().

Apparatus and method for cleaning an air filter unit

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Loveland, OH, United States of America

Alan W Ball