Patent ID: 11867004
Assignee: SAUDI ARABIAN OIL COMPANY
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 10:
11. A power tong assembly for making and breaking a tubular connection, the power tong assembly comprising:
a first tong operable to engage a first tubular;
a second tong operable to engage and rotate a second tubular relative to the first tubular to make or break the tubular connection, wherein the second tong comprises
a rotation lever operable to set rotation of the second tong to a makeup setting when the rotation lever is in a first position or a break out setting when the rotation lever is in a second position; and
a speed lever operable to set rotation speed of the second tong in a low speed position or a high speed position;

a system for selectively preventing high speed rotation of the power tong comprising a rotation lever position locking element and a coupling mechanism, wherein
the rotation lever position locking element is movable between a blocking position wherein the rotation lever position locking element blocks movement of the rotation lever between the first position and the second position and a non-blocking position wherein the rotation lever position locking element does not block movement of the rotation lever; and
the coupling mechanism couples the rotation lever position locking element to the speed lever such that movement of the speed lever from the low speed position to the high speed position moves the rotation lever position locking element from the non-blocking position to the blocking position and movement of the speed lever from the high speed position to the low speed position moves the rotation lever position locking element from the blocking position to the non-blocking position.