Swivels

Details Swivels Swivels

1990-02-07

1991-01-15

Neuder, William P.

Boring or penetrating the earth

With tool drive prime mover or above-ground mechanical...

173163, 285 98, E21B 302

Patent

active

049846418

ABSTRACT:
A swivel apparatus of the type having a main body for supporting a rotatable member, wherein the member supports a load therefrom and is journaled to the main body by a thrust bearing assembly that transfers the load from the rotatable member into the main body. The speed of rotation of the thrust bearing assembly is reduced to a value which is less than the speed of rotation of the rotatable member. This is achieved by rotatably driving a gear means by the rotatable member; and, arranging a first and a second thrust bearing and a middle race member adjacent to one another with the middle race member separating the first and second thrust bearings from one another. This enables the load carried by the rotatable member to be transferred into the first thrust bearing, into the middle race member, into the second thrust bearing, and into the main body. The middle race member is rotatably driven by the rotating gear means in a manner to cause the middle race member to rotate in opposition to the rotatable member at a speed which is less than the speed of the rotatable member and thereby reduce the centrifugal force imposed on the rollers of the thrust bearings by reducing the speed of rotation thereof. This invention further includes rotatably supporting a washpipe from the swivel main body and connecting the washpipe to the rotatable member with seal means so that fluid can flow through the washpipe, into said rotatable member; and, rotatably driving the washpipe in the same direction and at reduced rotational speed respective to the rotatable member in response to rotation of said rotatable member.

REFERENCES:
patent: 4574893 (1986-03-01), Young et al.
patent: 4890681 (1990-01-01), Skelly

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