| 摘要 |
PURPOSE: A stamp compass is provided to exactly record and check the direction of a magnetic field without iron powders easily lost and to simply make out properties of lines of magnetic force. CONSTITUTION: A stamp compass is composed of an outer frame(70) having guide elongated holes(74) at both sides and an underlay(72) with a printing hole(73); a center bearing(60) having a guide bar(64) of which both ends are protruded outward through the guide elongated holes, and a combining hole(62) in the center; a transparent compass cover(80) having the lower end contacted to the upper end of the center bearing; a rebound spring(50) for rebounding upward the center bearing; a ball bearing(40) mounted to the inner periphery of the combining hole of the center bearing; a movable center shaft(30) having a pin hole at the upper end and a combining lumbar unit(32) at the lower end, joining with the lower end of a magnetic needle fitting unit(36) having an inserting groove(37) at the upper end by a combining pin(34), and freely moving; a fountain stamp(20) fitted in the combining lumbar unit of the movably center shaft, filled with ink, and formed with a printing unit(22) dipped with the ink to print; and a magnet(10,10a) fixed in the inserting groove of the magnetic needle fitting unit.
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