Patent ID: 7503763

Claim:
An in mouth cavity tracing device, comprising: an upper jaw plate having a substantially U-shaped main body, the upper jaw plate including a guide prop stud, a tracing pin, and at least two auxiliary studs; a lower jaw plate having a substantially U-shaped main body; and a coupling tool which connects the upper jaw plate and lower jaw plate, wherein the upper jaw plate includes a connection pore formed downward and having an opening located substantially at a center of the U-shaped main body of the upper jaw plate and configured to connect to the guide prop stud, the upper jaw plate includes a tracing pin installation pore formed downward and having an opening configured to connect to the tracing pin at a front of the main body of the upper jaw plate, and the two auxiliary studs are configured to record movement lines and project in substantial symmetry respectively downward at a rear of the main body of the upper jaw plate, wherein the lower jaw plate includes a guide tracing table configured to be positioned at a substantial center of the U shaped main body of the upper jaw plate when the upper jaw plate is connected to the lower jaw plate, and the lower jaw plate includes movement line formation tables located at a rear of the U shaped main body of the lower jaw respectively in substantial symmetry, and the coupling tool includes an upper jaw plate connection part having a plurality of studs configured to connect with the upper jaw plate, and a lower jaw plate connection part including another stud configured to connect with the lower jaw plate, the upper jaw plate connection part includes a portion extending in an opposed relationship with respect to the studs and configured to mate with the lower jaw plate connection part, and a plate interval fixing screw configured to connect the upper jaw plate connection part with the lower jaw plate connection part and configured to release the upper jaw plate connection part from the lower jaw plate connection part when rotated a predetermined amount, and at least a part of at least one of the upper jaw plate connection pore and the upper jaw plate tracing pin installation pore includes a first magnetic material, and at least a respective one of a part of the guide prop stud and a part of the tracing pin includes a second magnetic material configured such that the first magnetic material is magnetically attracted to the second magnetic material and such that a retaining force exists between the first magnetic material and second magnetic material to retain the at least respective one of a part of the guide prop stud and a part of the tracing pin within a respective one of the upper jaw plate connection pore and the upper jaw plate tracing pin installation pore, and wherein the at least one of a part of the guide prop stud and a part of the tracing pin is configured to closely mate with and extend into a respective one of the upper jaw plate connection pore and the upper jaw plate tracing pin installation pore.