Patent ID: 8881461

Claim:
A restrictor, comprising: a housing; a tab pivotally mounted on the housing; a pushing element; and a restraining element, the tab comprising a first arm and a second arm, the tab being pivotally movable relative to the housing between: at least a first pivot position, in which the restraining element is in a disengaged arrangement and at least a portion of the first arm is on a first side of a first plane and an entirety of the second arm is on a second side of the first plane, and a second pivot position, in which: the restraining element is engaged, and the restraining element prevents the tab from pivoting, an entirety of the first arm is on the second side of the first plane, at least a portion of the second arm is on the first side of the first plane, and at least a portion of the second arm protrudes from the housing, the pushing element biasing the tab to pivot toward the first pivot position, with the restraining element engaged, the restraining element can be disengaged by pressing the second arm, such that the pushing element causes the tab to pivot toward the first pivot position.