Minnesota Mining and Manufacturing Company

John A Heveron

Gerald J Niles

Davis W Chamberlin

Vincent P Teuber

A shock shield formed of an annular body having a central axial hole which mounts within a case is disclosed. A cylindrical axial ring is formed around the central axial hole. The shock shield permits a tape reel stored within the case to rotate within the case and absorbs shocks to prevent damage to the tape reel. A tab on the shield mates with the tape reel to prevent relative rotation therebetween. Shock absorption is accomplished by compressible elements formed on the shield body. The compressible elements are annular bearing rings concentric with the annular circumference. The annular bearing rings have a generally V-shaped cross section and an axial height less than the axial height of the axial ring. The shield body preferably is formed of four spaced radial members to enhance flexion.

Shock shield for shipping cases

An erasure preventing button for preventing recording on a magnetic tape cassette slides within a cavity in a side wall of the cassette between a released position and a depressed position. The erasure preventing button includes a base, which interacts with the tape recorder when the button is released, and a front wall. The front wall includes an arm with a shoulder which is biased toward an opening formed in the side wall of the cavity. The shoulder extends into the opening when the erasure preventing button is released and includes a planar inclined surface which frictionally engages one corner of the opening to prevent the button from sliding from the released position to the depressed position. A rear arm extending from the base prevents the erasure preventing button from being removed from the cavity.

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Champlin, MN, United States of America

John A Heveron