The mechanism according to claim 1, wherein the first radial distance is less than the second radial distance.Ĥ. The second linkage comprises a second door arm having a second plate end rotatably coupled to the second cam plate and a second door end including means to be rotatably coupled to the second door.ģ. The first linkage comprises a first door arm having a first plate end rotatably coupled to the first cam plate and a first door end including means to be rotatably coupled to the first door and The mechanism according to claim 1, wherein: (c) a first linkage including means to couple the first cam plate to the first door Ī second linkage including means to couple the second cam plate to the second door andĪ first shuttle arm first end rotatably coupled to the first cam plate at a first radial distance from the first pivot pin andĪ first shuttle arm second end rotatably coupled to the second cam plate at a second radial distance from the second pivot pin.Ģ. (b) a first cam plate rotatably and linearly slidably mounted on the first pivot pin Ī second cam plate rotatably mounted and linearly slidably on the second pivot pin (a) a first pivot pin including means for mounting at the first fixed position of the door frame Ī second pivot pin including means for mounting at the second fixed position of the door frame A door-closing mechanism adapted for use in closing two doors including a first door and a second door, the door mounted on hinges to a door frame, the door frame having a first fixed position and a second fixed position relative thereto the mechanism comprising: The dimensions are adjusted for sequential closing of the doors.ġ. The mechanism is asymmetrical with the distances from the pivots to the door arms, the lengths of the door arms, and the attachment points of the hasps on the two sides being in general unequal. The door linked to the cam plate with the smaller distance closes first. The two different distances cause the cam plates, as linked by the shuttle arms, to rotate at different angular rates. On the first cam plate the shuttle arms are fastened at a radial distance (d/2) from the pivot pin, and on the second the shuttle the shuttle arms are fastened at a greater radial distance (D/2). A pair of crossed shuttle arms (50, 60) are rotatably coupled to the cam plates. Linkages, such as doors arms (20) hinged from each door to the corresponding cam plate, cause the doors to close when the cam plates rotate. Each pin engages a cam plate (30), so that the plate can rotate. A mechanism for closing in sequence a first door (D1) and then a second door (D2) has pivot pins (40) mounted to the door frame.
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