| 摘要 |
<p>PCT No. PCT/GB85/00560 Sec. 371 Date Sep. 4, 1986 Sec. 102(e) Date Sep. 4, 1986 PCT Filed Dec. 9, 1985 PCT Pub. No. WO86/04180 PCT Pub. Date Jul. 17, 1986.A conventional video cassette comprises a tape transport mechanism (1) comprising two reels each with an internally splined tape drive hole, contained in a protective housing (2). The protective housing (2) of the cassette is provided with two circular access holes through which the tape drive holes of the reels can be accessed, and normally the reels themselves are pressed into firm contact with the underside of the cassette protective housing (2) by a leaf spring (3). The device (10) of the invention can be inserted into either of the internally splined tape drive holes and pushed downwardly with compression of the associated leaf spring (3) of the video cassette until the underside of the protective housing (2) is exposed. Thereafter detent members (15) engage beneath the protective housing (2), and the device can be removed from the tape drive hole only by an authorized person using a key (17).</p> |
