초록 ▼

The high speed seal is an integral metal-to-metal type seal that, in its initial application, acts as a regular resilient O-ring. As the seal begins to operate, a protruding circular resilient lip adjacent the metal sealing ring provides an initial seal and, as the seal continues to function over a

The high speed seal is an integral metal-to-metal type seal that, in its initial application, acts as a regular resilient O-ring. As the seal begins to operate, a protruding circular resilient lip adjacent the metal sealing ring provides an initial seal and, as the seal continues to function over a length of time, the resilient portion wears away and metal-to-metal contact begins to be made. Thus the seal gradually converts from a standard O-ring type of seal to a lapped-in metal-to-metal seal during operation of the bit.

대표청구항 ▼

A seal apparatus for a rock bit, said seal being positioned in a cavity formed between a leg of said rock bit, said leg having a journal extending therefrom, and a rotatable cone mounted on said journal, said seal comprising: a metal ring, said ring having a diameter that will fit within said cavity

A seal apparatus for a rock bit, said seal being positioned in a cavity formed between a leg of said rock bit, said leg having a journal extending therefrom, and a rotatable cone mounted on said journal, said seal comprising: a metal ring, said ring having a diameter that will fit within said cavity, a peripheral surface formed by said ring subsequently serving as part of a metal-to-metal seal, a resilient material partially encapsulating said metal ring, said resilient material forming an O-ring type of seal in said cavity formed between said leg of said rock bit and said rotatable cone, during initial rotation of said cone on said journal, a portion of said resilient material nearest said metal peripheral surface eventually wears away exposing said peripheral metal surface to an adjacent cavity wall, said metal surface and said cavity wall subsequently forming a lapped sealing surface, said resilient sealing material prevents loss of a lubricant stored within said rock bit during the time said peripheral surface of said metal ring is forming a lapped seal against said adjacent wall of said cavity.