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

Claim 0:
1. A system for selectively preventing high speed rotation of a power tong, the power tong having a rotation lever operable to set rotation of the power 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 the rotation speed of the power tong to a low speed when the speed lever is in a low speed position or a high speed when the speed lever is in a high speed position, the system comprising:
a rotation lever position locking element 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
a coupling mechanism coupling 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.