| 摘要 |
A cam that when positioned next to a nail which is engaged with the claw of a claw hammer will keep the prying fulcrum of the hammer at the level of the head of the nail as the hammer rotates along the cam and pulls the nail upward with a force directed along the axis of the nail. The cam is provided with a handle that serves as an aid in positioning the cam and also an aid to placing the cam in and removing the cam from a craftsman's personal carrier. The handle also can serve as a straight edge, a scale, a scribing guide, a pry, and a tack and brad pulling aid. The handle and the cam together can serve as a square. The cam can be provided with a slot which a partially pulled nail can enter so that the hammer can regain a mechanical advantage and to press against the work surface and protect it from damage from the nail being pulled from the work surface.
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