| 摘要 |
A device for visually identifying the bisector of an angle, curve, line or space between two points and for visually identifying any point or points along the bisector. The device includes a base, a first arm, a second arm, an indexing assembly, at least two connection assemblies, and a sight. The first and second arms each have a proximal end pivotally connected to the base. The longitudinal axes of the arms are generally coplanar and pivot coplanarly. The indexing assembly is connected between the first arm and the second arm and indexes the relative pivotal motion of the arms. The indexing assembly communicates the pivotal motion of either of the first or second arm into a pivotal motion of the other of the first or second arm and pivots both arms equidistantly and equiangularly relative to a median line between and generally coplanar with the arms in such a manner that the same median line always bisects the angle defined by the longitudinal axes of the two arms. At least one connection assembly is located on each arm. The connection assemblies connect the arms to the points to be bisected in such a manner that the distance from the connection assembly on each arm to the apex of the angle created by the longitudinal axes of the arms is equal. The sight is connected to the base and superposes the common plane of the first and second arms. The sight is aligned to precisely view and sight along the median bisector line.
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