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DOOR CLOSER: DOOR ROTATES A SPINDLE IN CLOSER HOUSING WHICH DRIVES A CAM FOLLOWER ALONG A TRACK THEREIN AGAINST A RESILIENTLY BIASED RECIPROCAL PISTON: TORQUE AT SPINDLE GREATER WHEN DOOR CLOSED THAN WHEN OPEN
DOOR CLOSER: DOOR ROTATES A SPINDLE IN CLOSER HOUSING WHICH DRIVES A CAM FOLLOWER ALONG A TRACK THEREIN AGAINST A RESILIENTLY BIASED RECIPROCAL PISTON: TORQUE AT SPINDLE GREATER WHEN DOOR CLOSED THAN WHEN OPEN
