Patent ID: 8251329

Claim:
A cam holder system for clasping sheet material between a pair of cam surfaces, said system comprising: a first elongated frame member having a first cam surface defined thereon; a second elongated frame member having a second cam surface defined thereon and including an an outer arm and an inner arm, said outer arm including a first portion positioned substantially above a longitudinal center of the second elongated frame member and a second portion positioned substantially below the longitudinal center of the second elongated frame member; a hinge element coupled to said first elongated frame member and said second elongated frame member to pivotally attach said first elongated frame member to said second elongated frame member with said first cam surface and said second cam surface opposing one another and to define an axis of rotation substantially in the longitudinal center of said first elongated frame member and said second elongated frame member about which said first elongated frame member and said second elongated frame member rotate relatively, wherein the hinge element is pivotally attached to said second elongated frame member between the inner arm and the outer arm of said second elongated frame member; wherein said first cam surface and said second cam surface are on the same side of the axis of rotation in a latitudinal direction of said first elongated frame member and said second elongated frame member to allow said first cam surface to move relatively toward said second cam surface when said first elongated frame member and said second elongated frame member rotate relatively about the axis of rotation.