Opening and closing mechanism comprising a dead-center spring element
An opening and closing mechanism includes a dead-center spring element for a swivelable part, and a control curve is provided on a side wall of the swivelable part, and the dead-center spring element engages the control curve via a swivelable control lever to control an opening and closing force progression with the aid of the control curve.
1. An opening and closing mechanism comprising:
a movable part movable from a dead-center position to a closed position and from the dead-center position to a usage position, wherein the dead-center position is between the closed position and the usage position;
a dead-center spring element which acts on the movable part;
a control curve mounted on the movable part, the control curve being engageable by the dead-center spring element and having an angular deflection, wherein:
when the dead-center spring element engages the control curve on one side of the angular deflection, the dead-center spring element urges the movable part in a closing direction toward the closed position to move the movable part toward the closed position,
when the dead-center spring element engages the control curve on a side of the angular deflection opposite the one side, the dead-center spring element urges the movable part in an opening direction toward the usage position to move the movable part toward the usage position, and
when the dead-center spring element engages the angular deflection, the dead-center spring element urges the movable part neither in the opening direction or in the closing direction, whereby a moment that the dead-center spring element applies on the movable part is zero and the movable part is in the dead-center position;
a stop which limits an opening motion of the movable part in the opening direction and which is overcome when a misuse force is applied to the movable part in the opening direction, whereby the stop is elastically deformed and the movable part is moveable to a misuse position which is past the usage position in the opening direction.
2. The opening and closing mechanism according to claim 1 , wherein a moment which the dead-center spring element applies to the movable part, when the movable part is in the closed position or in the usage position, is greater than a moment the dead-center spring element applies to the movable part when the movable part is adjacent the dead-center position.
3. The opening and closing mechanism according to claim 1 , wherein the movable part is swivelably mounted and the angular deflection is a dead-center point which the dead-center spring element engages when the movable part is in the dead-center position.
4. The opening and closing mechanism according to claim 3 , wherein the control curve is curved at the dead-center point.
5. The opening and closing mechanism according to claim 1 , wherein the dead-center spring element is configured to snaps into a recess of the control curve when the movable part is in the closed position and snap into a recess of the control curve when the movable part is in the usage position.
6. The opening and closing mechanism according to claim 1 , wherein the dead-center spring element includes at a swivelable control lever which engages the control curve.