Abstract: In a drilling head assembly for rotary well drilling a tubular member has an external screw thread near its lower end, with the outer surface of the member below the thread tapering downwardly to its lower end to form a sealing surface. Screwed onto the thread is a metal ring that extends down past the sealing surface and is provided with an annular recess encircling and facing the sealing surface, from which it is spaced. A resilient sealing member encircles the ring and is secured to it, with the portion of the ring beside the sealing surface and below it embedded in the sealing member which also fills the annular recess in the ring. The sealing member converges downwardly below the ring to a neck portion, and the inner surface of the sealing member converges from above the annular recess downwardly to the neck portion so that the sealing member between the tapered sealing surface and the encircling portion of the ring is compressed by them to form a seal.

Abstract: A cigarette holder ring consisting of a resiliently contractible ring band operable to fit snugly on any portion of the wearer's finger, and a cigarette holding clip adapted normally to be folded extremely inconspicuously into the crown portion of the ring band, but to be extended therefrom to hold a cigarette, the clip being universally movably relative to the ring band to hold the cigarette in any position relative to his finger most suitable to any individual user.