Importance

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Abstract

In order to attain a small-sized opening and closing device suitable for use especially with a portable telephone which is so constructed to reduce cost by minimizing the number of parts to simplify the structure thereof, and to achieve a light pushing operation on a push-button, the present invention is composed of a shaft, a slider cam attached to the shaft slidably in an axial direction, having a cam portion in one end portion, a first compression spring interposed resiliently between the slider cam and the shaft, an inner cam attached rotatably relative to the shaft, having a cam portion disposed on a side thereof facing the cam portion of the slider cam, an outer cam attached to the shaft, accommodating the inner cam rotatably therein, with a cam portion thereof provided on a side facing the cam portion of the slider cam, a slide key disposed non-rotatably and slidably in an axial direction relative to the outer cam, for arresting and releasing the inner cam, a push-button disposed in one end portion of the slide key, and a second compression spring interposed resiliently between the push-button and/or the slide key and the outer cam, with a weaker resilient force than that of the first compression spring.

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First Claim