Patent ID: 9238951
Filing Date: 2016-01-19
CPC Classification: E21B

Claim Text:
1. A polish rod seal comprising: (a) a post comprising a bottom end that is threaded on the outside of the bottom end only, a top part, and a circumferential flange situated between the bottom end and the top part; (b) a collar that fits over the top part of the post, wherein the collar comprises one or more internal channels into which one or more O-rings are inserted, and wherein the O-rings are positioned between the collar and the top part of the post to form a seal between the collar and the post, the O-rings extending around an outer circumference of the post; (c) a barrel comprising a bottom end and two internal bushings, each of which comprises one or more internal channels into which one or more O-rings are inserted; wherein the bottom end of the barrel screws into the top part of the collar; (d) a bracket that is attached to the circumferential flange and that secures the collar on the top part of the post while still allowing it to flex on the post; and (e) top cap that screws onto a top end of the barrel; wherein a polish rod extends through the post, the collar and the barrel and is in contact with the O-rings in the internal bushings of the barrel; wherein the flex of the collar on the post is in the O-rings that form the seal between the collar and the post; wherein the barrel and the top part of the post each has an outer diameter, and wherein the outer diameter of the barrel is approximately equal to the outer diameter of the top part of the post; wherein there is a gap between a too surface of the circumferential flange and a bottom edge of the collar and a gap between a top edge of the collar and a bottom edge of a top circumferential portion of the bracket; wherein the collar and the barrel each has a constant outside diameter and wherein the inside diameter of the collar is greater than the outside diameter of the barrel.