Abstract: The secondary fork 36 is composed of an aluminum extrusion which is formed integrally with a pair of right and left outward guide rail grooves 40a, 40b to be fitted with the guide rollers 45, 46 provided on the fixed fork 35 side and a pair of right and left inward guide rail grooves 41a, 41b to be fitted with the guide rollers 47, 48 provided on the primary fork 37 side, so as to form the secondary fork 36 in a single member. As a result, assembling operation is not needed, and therefore the number of parts and the assembling processes of the running fork type load transfer apparatus can be greatly curtailed, so as to reduce the cost.

Abstract: A traveling crane, comprising an upper frame, a lower frame, an elongated guide post between the upper and lower frames, an elevating platform adapted to move up and down along the guide post, a device for moving the elevating platform, and a load transfer device mounted on the elevating platform, the guide post being a hollow aluminum extrusion being formed with an integral grove throughout its length, a guide roller attached to the edge of the elevating platform for rolling within the groove as the elevating platform moves up and down along the guide post, the device for moving including a drive chain attached to the elevating platform for suspending, raising, lowering the platform, a motor and a device for transferring the rotation of the motor to move the chain, the chain being threaded through the interior of the hollow guide post.

Abstract: A threaded element for forming a threaded profile in the wall of a bore formed in a material and for insertion into the bore so as to reinforce the bore. The threaded element includes a cylindrical stem having an external thread having a plurality of separate tapping lobes for cutting the threaded profile in the wall of the bore. The stem has an unthreaded radius smaller than the unthreaded radius of the bore and a threaded radius greater than the unthreaded radius of the bore. A recess is defined between each adjacent pair of tapping lobes. Each tapping lobe is defined by two cutting arcs formed at its opposite ends and a convex escape-gap arc is located intermediate the two cutting arcs. Each cutting arc has a convex configuration relative to the center of the stem, and the apex of each of the cutting arcs defines the maximum thread radius of the threaded profile, as measured from the center of the stem.

Abstract: A stud fastening assembly 10 including a stud 11 having a threaded end threadable into a hole 15 formed in a workpiece 16 and a plurality of serrated rings 21 and 22 for securing the stud in place. The serrated rings include inner serrations 20 sized to slidably engage longitudinal serrations 14 formed on a mid-section of the stud and further include outer serrations 19 configured to engage the sidewalls of the hole formed in the workpiece and thereby prevent relative rotation. The lower ring includes fewer outer serrations than does the upper ring, to facilitate installation.