Abstract: During the application of heat the intumescent coating is transformed into a swollen char material, which acts as a thermal barrier to eliminate or minimize incoming heat flux. It also acts as a mass transfer barrier, inhibiting oxygen from reaching the thermally insulative ablative material. During the intumescence process, the swollen material will also back fill into interstices within the ablative material and char to enhance their strength. The intumescent coating also acts as a moisture barrier to protect the thermally insulative ablative material from ambient elements such as moisture.

Abstract: A coupling for transferring torque and axial force from a first member to a second member. The coupling includes a first cylindrical member having an outer peripheral surface and an end portion and a second cylindrical member having a receiving end portion. The receiving end portion has an end face with a longitudinal bore in the receiving end portion for receiving the end portion of the first cylindrical member. The end portion of the first cylindrical member has a plurality of transverse keyways in the outer peripheral surface. The receiving end portion of the second cylindrical member has a plurality of transverse slots in the receiving end portion corresponding to the plurality of transverse keyways. A key is received in each transverse keyway and protrudes from each transverse keyway into the corresponding transverse slot. A retainer ring has a bore such that the retainer ring extends over the plurality of transverse slots of the receiving end portion of the second cylindrical member.

Abstract: A coupling for transferring torque and axial force from a first member to a second member. The coupling includes a first cylindrical member having an outer peripheral surface and an end portion and a second cylindrical member having a receiving end portion. The receiving end portion has an end face with a longitudinal bore in the receiving end portion for receiving the end portion of the first cylindrical member. The end portion of the first cylindrical member has a plurality of transverse keyways in the outer peripheral surface. The receiving end portion of the second cylindrical member has a plurality of transverse slots in the receiving end portion corresponding to the plurality of transverse keyways. A key is received in each transverse keyway and protrudes from each transverse keyway into the corresponding transverse slot. A retainer ring has a bore such that the retainer ring extends over the plurality of transverse slots of the receiving end portion of the second cylindrical member.

Abstract: Automatic drill pipe breakout torque is provided by a power sub or swivel. By connecting the drive pin of the power sub to the drill pipe in a non-threaded releasable manner the power sub is able to provide the breakout torque to breakout both threaded connections of a drill pipe segment. In geophysical or seismic drilling, a sliding barrel concentric with the drive pin releasable connects the drive pin to the drill pipe by engaging ridges on the pipe upsets with dogs on the barrel interior. The releasable non-threaded connection between the drive pin and the drill pipe segment allows breakout torque to be transmitted through the drill pipe segment after the threaded connection between the drive pin and the drill pipe segment has been partially broken out.

Abstract: A clamp for exerting joining force perpendicular to the joint line of a miter joint includes first and second sets of parallel pins defining first and second planes respectively, each set comprising at least two pins, all the pins being substantially equal in length, the first plane being parallel to and co-extensive with the second plane, and means for applying force in a direction perpendicular to the two planes to move the first and second sets of pins toward each other. In a preferred embodiment, first and second members hold the first and second sets of pins respectively and a threaded cylindrical shaft passes through holes in the members; the hole in the first member is threaded to receive the shaft threads and the hole in the second member is unthreaded and just large enough for the shaft to rotate freely therein, the second member being fixed in axial position on the shaft. In such embodiment rotation of the shaft moves the first member axially along the shaft toward the second member.

Abstract: Water or other heat-conducting liquid is heated in an upwardly open, substantially hemispherical outer bowl, the inside surface of which is treated to absorb heat from the sun's rays. The water or other liquid is introduced at the rim of the outer bowl and runs down the inside surface thereof, thereby being heated by the combined effects of the sun's rays and the heat absorbed by the outer bowl. A transparent, substantially hemispherical inner bowl is positioned within and spaced from the outer bowl to form a passageway for the water or other liquid. A tube or pipe is provided at the bottom of the outer bowl for allowing heated water or other liquid to drain from that bowl, and another tube or pipe is provided at the bottom of the inner bowl for allowing rain or melted snow to drain from that bowl.