Abstract: An improved seal assembly for a well head including a ring-shaped seal body positioned in the tubing head, a tubular coupling formed to the seal body and adapted to connect between adjacent portions of inner tubing, a lower seal ring positioned in the tubing head above the seal body and surrouding the coupling, a pliable rubber gasket positioned in the tubing head above the lower seal ring and surrounding the coupling, and an upper seal ring positioned in the tubing head above the gasket and surrounding the coupling. The seal body has a central circular opening and a radial slot for a cable. The lower seal ring has an inner circular section and an outer circular section split into an arcuate outer front section, and an arcuate outer rear section. The outer section has a semi-circular opening along the inner edge. The inner section is provided with a semi-circular opening on the outer edge which mates with the semi-circular opening on the outer section to form a passageway for the cable.

Abstract: A latching mechanism for a hoisting hook of the type having a C-shaped body portion with a stem at one end and a tip at an opposite end spaced from the stem to form a mouth, a longitudinally extending latch pivotally connected at one end to the stem for pivotal movement towards and away from the body portion about a horizontal pivot axis perpendicular to and spaced from the central axis of the stem, the tip having a recess means therein terminating in a stop means, the latch being provided with a projection means adjacent the opposite free end, whereby, when the latch is pivoted about its pivot axis away from the body portion, the projection means will pass into the recess means until it engages the stop means, constituting a closed position of the latch with respect to the hook, a spring means for urging the latch away from the body portion towards and into engagement with the tip, and rotatable locking means at the opposite end of the latch and selectively engagable with the upper end of the tip for retaini

Abstract: A gate latching mechanism comprising a gate for closing the mouth of a hoist hook. The gate is attached to the hook and pivotally movable out of the mouth of the hook about a substantially vertical pivot axis spaced from the central axis of the stem of the hook. A spring which is located at the pivot axis biases the gate to swing to an open position. The free end of the gate is provided with a latch which, when closed, covers the tip of the hook, a lock which holds the latch engaged with the tip until the lock is manually released, and a locking spring for moving the lock to the locked position when the latch is moved to engage the tip.

Abstract: A method and apparatus for forming a flat circular disc of metal having a central opening therein into a sheave of the type having an annular peripheral groove for receiving a wire line therein, the size and shape of said groove corresponding to the diameter of said wire line; the disc has two flat side portions separated by the width of said disc and an outer diameter slightly larger than the outer diameter of the sheave to be produced; the apparatus by which the method of the present invention is carried out includes a pair of rotatable holding members rotatable on a common horizontal axis, means for moving the holders axially relatively towards and away from each other whereby when the holders are moved axially towards each other, the holders will engage the disc therebetween; each holder is provided with a hub portion facing towards the other holder concentric with the common horizontal axis and adapted to be received in the central opening of said disc; a rotatable forming roller is rotatable on an axis