Florence B Mallet

US Patent:

57279950, Mar 17, 1998

Filed:

Oct 24, 1994

Appl. No.:

8/328315

Inventors:

Brian Godfrey Harkins - Collegeville PA
Robert Walter Hoeflein - Paoli PA
Christopher Paul Dee - Leamington Spa, GB2
Florence Beatrice Mallet - Wayne PA

Assignee:

Trelawny Pneumatic Tools Division of Fulton Group Ltd. - Malvern PA

International Classification:

B23F 1905
B24D 900

US Classification:

451463

Abstract:

A surface preparation tool for peening and removing a coating from a work surface, the tool including a rotating hub which retains a plurality of peening flaps with peening particles attached at one end. The peening particles impact the work surface as the hub rotates and cause the coating to fragment and dislodge from the work surface. The tool includes a shroud assembly with a funnel-shaped evacuation port attached thereto. The shroud is positioned above the work surface such that a gap is formed which permits air to enter into the shroud. A sealing structure is affixed to the rear wall of the shroud to block air flow into the shroud below the funnel. When a vacuum is applied to the funnel, the narrow gap formed between the shroud and the work surface accelerates ambient air flow into the shroud while preventing dislodged particles from escaping. The rear wall seal prevents air from flowing into the shroud below the funnel which would oppose the direction of flow from the other three sides into the funnel. This results in a directional airflow, aligned to carry dislodged particles into the funnel mouth.