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US 4,360,186 AGranted
Swivel joint
OwnerWilliam B. Tinsley, C. Richard Baconinventors
Life of this patent
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OwnerWilliam B. Tinsley, C. Richard Baconinventors
Estimating the term…
A Swivel Joint for use on producing wells which are being pumped, having an upper and a lower annular member, in juxtaposition, with a coil spring separating the members, the lower member having a curved external face to receive, in line contact, the inside wall of the retaining member, which is engaged with the upper member, and having a packing chamber and a packing nut having one end extending into said packing chamber, and a grease chamber in said packing nut, and packing members mounted in said packing chamber compressed by one end of said packing nut. A blow out preventer is mounted on the lower member having a collapsible packing retainer in which a flexible packing is mounted, said retainer being maintained normally in inactive position, with means for moving said packing into active position to seal off the annulus between the sucker rod and the inside wall of the lower annular member to permit repacking of the packing gland, or to act as a blowout preventer, said packing retainer retracting the packing material when the activating means is moved to inactive position.
In a swivel joint for use in pumping wells, an upper and lower annular member, each having a face thereon, connecting means for connecting said members with said faces opposed to each other and maintaining said members in position on a well head, said upper and lower annular members and connecting means having aligned bores extending therethrough in which a sucker rod is positioned for reciprocation, said bores and sucker rod defining an annulus therebetween, said upper member having packing means sealing the annulus between the sucker rod and the upper member, the upper portion of the lower annular member having an external curved surface and the internal wall of the connecting means being internally curved forming a line contact with said externally curved surface of said lower annular member, a yieldable means mounted in the respective opposed faces of the upper and lower annular members constantly urging said members apart and the annulus between the sucker rod and the lower member admitting a flow of production fluid under pressure into the area between said opposed faces to assist in maintaining said annular members in spaced relationship.
Dependencies are inferred from the claim text.