Abstract: A cover for temporarily covering a hinge, the hinge having a first portion for mounting on a fixed surface and a second portion for mounting on a door, the second portion hingedly attached to the first portion, the hinge having a first position wherein the first and second portions are perpendicular to one another, and a second position wherein the first and second portions are parallel to one another. The hinge cover includes a first member having a raised central channel, first left and right flanges, and a first vertical flange for resiliently engaging at least one vertical surface of the first hinge portion. A second member includes a raised channel, second left and right flanges, and a second vertical flange for resiliently engaging at least one vertical surface of the second hinge portion, the second body portion raised channel adapted for receiving a portion of the first member raised central channel.

Abstract: A leg support for attachment to a crutch for supporting the affected leg of a user, and having a cushioned upper surface. The support is preferably adjustable to a variety of heights on the crutch, and adjustable to position the cushioned upper member at one or more preselected angles for enhanced comfort.

Abstract: An absorbent compacted composition is disclosed. The absorbent compacted composition of the present invention consists essentially of clay, a finely divided cellulosic material, such as fir, and finely divided pine. The amount of finely divided cellulosic material and finely divided pine is enough to bind the composition into a compacted form without additional binders or water addition. Also, the amount of pine is sufficient to reduce the friction heat during compaction to no greater than about 200° F.

Abstract: A underreamer drill bit assembly including a pilot bit and extendable underreaming arms operatively connected to the pilot bit. The underreaming arms have an extended position for underreaming, and a retracted position in which the overall diameter of the underreamer drill bit assembly is less than the inside diameter of the well casing, permitting the entire bit assembly to be withdrawn through the well casing. In another aspect of the invention, the bit assembly is operatively connected to a dual wall pipe assembly. A supply of compressed air is conducted through the annulus of the dual wall pipe assembly to a down hole pneumatic hammer. Exhaust air from the down hole hammer is directed to the bit assembly for continuous removal of drilling debris through a central evacuation tube of the dual wall pipe assembly. In another aspect of the invention, a pressurized, incompressible fluid is injected into the annulus between the well casing and the downhole pneumatic hammer.