Abstract: A device for positioning and locking a head clamp in a selective position including a first arm, a second arm and a third arm. The third arm having a free end including both a spherical member carried in a socket and including a mounting tube and a gripping device to restrain movement of said spherical member. The head clamp includes a mounting post for insertion to said mounting tube wherein said mounting tube includes a releasable locking device for engaging and holding said mounting post against rotation and withdrawal of said mounting tube to prevent accidental release of the mounting post.

Abstract: A locking device for positioning and locking an object in a selected position including a first arm, a second arm, a third arm and a mounting arm; the arms are structured to movably connect a support for an object to the platform; the arms are slidably and rotatably engageable with one another to allow positioning of the object in any desired position in three-dimensional space; each arm is associated with a locking lever, each locking lever is itself provided with a locking device to hold the associated arm in a closed position when actuated and which can be released by pressing on a pin; the pin is provided with spring biased detent members so that movement of the pin will move the detent members out of a restraining position to allow releasing of the lever arm.

Abstract: A combined saw blade and measuring device, or ruler. The saw blade includes a measuring device, or ruler, manufactured as an integrated component of the blade. In this case the ruler is marked, or etched, on the saw blade such that the blade acts as a ruler and straight edge. The ruler is marked on the horizontal edge opposite the saw teeth and runs the length of the saw blade. In this manner there is no need for adjunct attachments to the blade that act as measuring device or the use of a separate measuring device, or ruler, for the purpose of measuring the length of material to be cut. This design eliminates the need for a separate measuring device and therefore simplifies the process of measuring and cutting lengths of material.