| 摘要 |
A protecting device (1) for transparencies (8) intended for overhead projection and pivotably mounted about a swivel pin (9) in the protecting device (1) is provided in the form of an unfoldable file. This file comprises a bottom cover (2) shaped as a rectangular frame with a transparent window (5) and comprising side members (6,7) secured thereto and situated at opposing rim portions. The swivel pin (9) is mounted in one side of the frame, preferably adjacent one corner of the frame, and in such a manner that it extends substantially perpendicular from said frame. The transparencies (8) are provided with a gripping register (10a, b, c) and are collated in a swivel cover (11) so as to be turned out individually, said swivel cover being pivotably mounted about the swivel pin. As a result, the protecting device can also be used as an easily operatable and detached presentation device which can be moved on the working surface of the overhead projector during the presentation, and whereby the transparencies (8) can be projected in any combination and sequence at the same time as they are always well protected in the device.
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