| 摘要 |
An attachment for the enhanced measurement accuracy of a combination square is provided which consists of a horizontally elongated base of generally rectangular shape. A rectangular base indentation is positioned along the horizontal centerline of the base, and forms a plane that is parallel to the bottom surface of the base. The base indentation lateral walls are equidistant from the horizontal centerline of the base, and are of sufficient lateral distance to allow the handle lower contact surface of a combination square to have sufficient lateral clearance to slidably engage the base indentation and rest against the base indentation contact surface. The vertical depth of the base indentation provides sufficient vertical clearance for the handle upper contact surface to fit within the assembled device. A combination square blade receiving slot runs along the horizontal centerline of the base, and has a lateral width, vertical height, and horizontal depth sufficient to permit the combination square blade to slide into and become seated within it. Removably positioned against the base upper surface are two impingement plates, secured to the base by removable impingement plate securement means. When the impingement plates are secured to the base, a bounded area is created, partially bounded on the top by the impingement plate bottom surface, bounded completely on the sides by the base indentation lateral walls, and bounded on the bottom by the base indentation contact surface. An interference notch on each impingement plate stops the forward movement of the combination square into the present invention.
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