Abstract: A well drilling apparatus (10?) (top drive) designed to be suspended from a travelling block (6?) in a drawworks and laterally supported by a dolly (9?) running together with the well drilling apparatus along tracks or rails fixed to a derrick. The drilling apparatus (10?) comprises at least one driving motor (5?), one power transmission (4?) powered by the at least one driving motor (5?), a drive shaft (70) driven from the power transmission (4?) and designed to be connected to a drill string, load transferring means, and a torque arresting device (3?) fixed to and depending from the power transmission (4?). The load transferring means is in the form of a load frame module (1?) that relieves the drive shaft (70) and the power transmission (4?) at the same time as the load frame module (1?) forms a central component module that the other main components of the well drilling apparatus are releasable connected to.

Abstract: A well drilling apparatus (10) (top drive) designed to be suspended from a travelling block (6) in a drawworks and laterally supported by a dolly (9) running together with the well drilling apparatus along tracks or rails fixed to a derrick. The well drilling apparatus (10) comprises at least one driving motor (5), one power transmission (4) powered by the at least one driving motor (5), a drive shaft (7) driven from the power transmission (4) and designed to be connected to a drill string, load transferring means, and a torque arresting device (3) fixed to and depending from the power transmission (4). At least a number of the above referred components of the well drilling apparatus (10) are designed and arranged as component modules, which by means of quick releasable connecting means connect the individual components/modules together.

Abstract: A well drilling apparatus (10) (top drive) designed to be suspended from a travelling block (6) in a drawworks and laterally supported by a dolly (9) running together with the well drilling apparatus along tracks or rails fixed to a derrick. The well drilling apparatus (10) comprises at least one driving motor (5), one power transmission (4) powered by the at least one driving motor (5), a drive shaft (7) driven from the power transmission (4) and designed to be connected to a drill string, load transferring means, and a torque arresting device (3) fixed to and depending from the power transmission (4). At least a number of the above referred components of the well drilling apparatus (10) are designed and arranged as component modules, which by means of quick releasable connecting means connect the individual components/modules together.

Abstract: A well drilling apparatus (10?) (top drive) designed to be suspended from a travelling block (6?) in a drawworks and laterally supported by a dolly (9?) running together with the well drilling apparatus along tracks or rails fixed to a derrick. The drilling apparatus (10?) comprises at least one driving motor (5?), one power transmission (4?) powered by the at least one driving motor (5?), a drive shaft (70) driven from the power transmission (4?) and designed to be connected to a drill string, load transferring means, and a torque arresting device (3?) fixed to and depending from the power transmission (4?). The load transferring means is in the form of a load frame module (1?) that relieves the drive shaft (70) and the power transmission (4?) at the same time as the load frame module (1?) forms a central component module that the other main components of the well drilling apparatus are releasable connected to.