Safety device, and opening and closing mechanism
A safety device used together with a push-push type latch device latching and releasing a movable body to a main body by a push operation against an urging force of an urging device, has a circulation cam groove having a reciprocation groove portion and a latch groove portion; a responding member having a pin to trace the circulation cam groove and a balancer disposed therein; and an urging member disposed on the responding member to urge the responding member in a pull-in direction. When the responding member receives a load, the responding member slides against an urging force of the urging member and the pin irreversibly moves from the reciprocation groove portion to the latch groove portion, so that even if the latching of the latch device is released due to the load, the movable body is retained in the fixed position.
1. A safety device used together with a push-push latch device which latches a movable body to a main body at a fixed position of the main body by a push operation against an urging force of urging means and which allows a latching to be released by a next push operation, the safety device comprising:
a circulation cam groove adapted to be provided in either the main body or the movable body and having a reciprocation groove portion, a latching guide groove portion, a returning guide groove portion, a return groove, and a latch groove portion;
a responding member adapted to be provided in the other of the main body or the movable body and having a pin provided at one side thereof to trace the circulation cam groove and a balancer at the other side thereof; and
an urging member disposed on the responding member to urge the responding member in a pull-in direction;
wherein when the responding member receives a load, the responding member slides against an urging force of the urging member and the pin irreversibly moves from the reciprocation groove portion to the latch groove portion through the latching guide groove portion, so that even if the latching of the latch device is released due to the load, the movable body is retained in the fixed position.
2. A safety device according to claim 1 , further comprising a retaining portion to slidably support the responding member to the main body,
wherein the pin is disposed in a projecting end side which projects from the retaining portion.
3. A safety device according to claim 2 , further comprising a leaf spring attached to the retaining portion to push the pin in one direction.
4. A safety device according to claim 1 , wherein the circulation cam groove is arranged such that
when the movable body retained in the fixed position receives the push operation, the circulation cam groove allows the pin to move from the latch groove portion to the reciprocation groove portion through the returning guide groove portion, and thereby releasing the movable body from the fixed portion.
5. An opening and closing mechanism which switches a movable body relative to a main body from an open position to a closed position by a push operation against an urging force, and switches the movable body in an open direction from the closed position due to the urging force, comprising the safety device according to claim 1 .