According to the present invention, a hinge device which may be mounted
with one action without fixing and mounting the hinge device with any other discrete
part and is superior in mounting work, in which a cam portion 4 is provided
within a mounting case body 3 in a rotation preventing manner, the cam portion
4 is provided slidably movably within the mounting case body 4 against
an engagement biasing spring 5 provided within the mounting case body 3,
a cam engagement portion 6 for engaging with the cam portion 4 by
the engagement biasing spring 5 is provided in confrontation with the cam
portion 4, the cam engagement portion 4 or a mounting portion provided
in the cam engagement portion 6 is provided projectingly on one side of
the mounting case body 3, the mounting case body 3 is provided in
a fixed condition to the first member 1, the cam engagement portion 6
or the mounting portion provided in the cam engagement portion 6 is
provided in a fixed condition to the second member 2, when the second member
2 is rotated to the first member 1, the cam portion 4 and
the cam engagement portion 6 are disengaged and rotated to each other while
the cam portion 4 is separated against the engagement biasing spring 5
and a rotational position of the second member 2 is held to the first
member 1 under the condition that the cam portion 4 and the cam engagement
portion 6 are biased and engaged with each other, characterized in that
the cam engagement portion 6 provided on one side of the mounting case body
3 or the mounting portion provided in the cam engagement portion 6 is
slidably movably (retractably and movably) provided together with the cam portion
4 against the engagement biasing spring 5 toward the inside of the
mounting case body 3 so that the cam engagement portion 6 or the
mounting portion is fixed to the second member 2 with one action by the
retracting motion and by the returning and restoring motion of the engagement biasing
spring 5.
