Gripping teeth and gripper

Abstract

Gripping teeth and grippers capable of reliably grasping a test piece to conduct a material test even for a brittle material or a composite material are provided. Multiple protrusions which are referred to as blade-shaped teeth having pointed leading ends are formed on tooth surfaces (15). The gripping teeth have the tooth surfaces (15) on which teeth cutting from two directions are crossed to form the protrusions and intervals between the protrusions are reduced to increase an amount of the protrusions. When a test piece is grasped by the gripping teeth, a force applied to each protrusion is reduced, and thus a depth by which each protrusion bites into the test piece can be shallow, and the test piece strength at grasped parts of the test piece can be prevented from decreasing.

Dependencies are inferred from the claim text.