Method for forming air flow control orifice in an inflated blank

Details Method for forming air flow control orifice in an inflated blank Method for forming air flow control orifice in an inflated blank

1992-07-20

1993-09-21

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

Punching article from sheet material

264154, 264156, 83 30, 83660, B26F 120

Patent

active

052466566

ABSTRACT:
The invention pertains to the method for forming air flow control orifices in a patient body temperature regulating blanket consisting of an inflated envelope defined by thin plastic film wherein temperature controlled air flows through the blanket orifices upon the patient's body. The blanket side disposed toward the patient is pierced by a sharp pointed punch having a plurality of intersecting facets defining sharpened intersecting edges. The punch apex and facet intersecting edges are related to the moving film in such a manner that the penetration of the punch forms a plurality of flexible valve flaps, and the valve flaps engaging the patient's body will be retained in a closed condition to restrain air flow through those orifices engaging the body to prevent exposure to excessive air temperatures.

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patent: 3956956 (1976-05-01), Bertlolf
patent: 4176567 (1979-12-01), Weisberg
patent: 4653363 (1987-03-01), Lang
patent: 5125238 (1992-06-01), Ragan et al.

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