Earthquake-proof latch mechanism
An earthquake-proof latch mechanism includes a case body, a hook member which is swingably supported on the case body, and a pendulum member which is vibratably suspended and supported on the case body. The hook member includes a hook on one side of a swinging shaft and a pendulum engagement portion on the other side of the swing shaft. A through hole is formed in the pendulum engagement portion. The pendulum member is disposed to penetrate the through hole, and a peripheral surface of the pendulum member facing the through hole is formed into a tapered shape. The peripheral surface pushes up the inner periphery of the through hole to swing the hook member when the pendulum member vibrates. Thus, the earthquake-proof latch mechanism is made compact.
1. An earthquake-proof latch mechanism which engages with a reception portion provided on a door body when vibration occurs so that the earthquake-proof latch mechanism can lock and prevent the door body from opening, the earthquake-proof latch mechanism comprising:
a case body;
a hook member which is swingably supported in the case body; and
a pendulum member which is vibratably suspended and supported in the case body; wherein:
the hook member includes a hook on one side of a swinging shaft and a pendulum engagement portion on another side of the swinging shaft, the hook engaging with the reception portion, a through hole being formed in the pendulum engagement portion;
the pendulum member is disposed to penetrate the through hole, and a peripheral surface of the pendulum member facing the through hole is formed into a tapered shape; and
the peripheral surface pushes up an inner periphery of the through hole to swing the hook member when the pendulum member vibrates.
2. An earthquake-proof latch mechanism according to claim 1 , wherein:
a bottom surface of the pendulum member does not touch any other member.
3. An earthquake-proof latch mechanism according to claim 1 , wherein:
a bottom surface of the pendulum member is formed into a curved surface.
4. An earthquake-proof latch mechanism according to claim 1 , wherein:
the case body includes a pendulum reception chamber which receives the pendulum member; and
the pendulum reception chamber is provided with a collision portion which allows the vibrating pendulum member to collide therewith to thereby change a vibrating direction of the pendulum member.
5. An earthquake-proof latch mechanism according to claim 1 , wherein:
the pendulum engagement portion has a front end extending obliquely downward in a non-vibration state.