Wrench assembly bumper plate systems

1 . A wrench assembly for assisting with attaching drill segments to, and/or separating drill segments from, a drill string, the wrench assembly comprising:

a pair of arms, each arm comprising a bumper plate shaped to be separately removably mountable to both:

a first one of the pair of arms in a first arm impact location where the bumper plate receives impact force when the first one of the arms makes contact with a drill segment; or

a second one of the pair of arms in a second arm impact location where the bumper plate receives impact force when the second one of the arms makes contact with the drill segment.

2 . The wrench assembly of claim 1 wherein each arm further comprises:

a housing defining an interior that houses one or more other components of the arm;

a cover plate removably mountable to the arm in a location spaced apart from the bumper plate to thereby cover an access to the interior of the housing.

3 . The wrench assembly of claim 2 wherein, for each arm, the bumper plate is removably mountable to the arm in a manner such that the bumper plate is removable from the arm while the cover plate remains mounted to the arm.

4 . The wrench assembly of claim 2 wherein, for each arm, the bumper plate is removably mountable to the arm in a location where the bumper plate is removable from the arm while the cover plate remains mounted to the arm.

5 . The wrench assembly of claim 2 wherein, for each arm, the bumper plate is separately embodied from the cover plate.

6 . The wrench assembly of claim 2 wherein the cover plate is shaped to be separately removably mountable to both the first one of the pair of arms, or the second one of the pair of arms.

7 . The wrench assembly of claim 2 wherein, for each arm, when mounted, the cover plate physically engages with one or more idler shafts to maintain a position of the one or more idler shafts.

8 . The wrench assembly of claim 1 wherein each arm comprises a tubular level gauge, the tubular level gauge located on the arm in a location spaced apart from the bumper plate.

9 . The wrench assembly of claim 1 wherein each arm further comprises: a roller shaft supported for rotational movement relative to the arm; and a seal carrier located between the roller shaft and the bumper plate.

10 . The wrench assembly of claim 1 wherein each arm further comprises a hinge pin about which the arm is pivotable, the hinge pin comprising at least one lubrication port through which lubrication can be introduced to bearing surfaces of the hinge pin.

11 . The wrench assembly of claim 10 wherein the hinge pin is mounted to the arm using a pair of bushings.

12 . The wrench assembly of claim 1 wherein each arm comprises a hinge pin lock which is shaped to be separately coupleable to the hinge pin of both the first one of the pair of arms or the second one of the pair of arms.

13 . A kit for servicing an arm of a wrench assembly for assisting with attaching drill segments to, and/or separating drill segments from, a drill string, the kit comprising:

a bumper plate; and

a cover plate embodied separately from the bumper plate;

wherein the bumper plate is shaped for mounting to the arm in a location where the bumper plate receives impact force when the arm makes contact with a drill segment;

wherein the cover plate is shaped for mounting to the arm in a location spaced apart from the bumper plate to thereby cover an access to an interior of a housing of the arm.

14 . The kit of claim 13 wherein the bumper plate and cover plate together are mountable to the arm in a place of an existing bumper plate.

15 . The kit of claim 13 wherein the arm is one of a pair of arms, and the bumper plate and cover plate are separately mountable to both a first one of the pair of arms of the wrench assembly, or a second one of the pair of arms of the wrench assembly.

16 . The kit of claim 13 wherein the bumper plate is removably mountable to the arm in a manner such that the bumper plate is removable from the arm while the cover plate remains mounted to the arm.

17 . The kit of claim 13 wherein the bumper plate is removably mountable to the arm in a location where the bumper plate is removable from the arm while the cover plate remains mounted to the arm.

18 . The kit of claim 13 wherein, when mounted, the cover plate physically engages with one or more idler shafts to maintain a position of the one or more idler shafts on the arm.

19 . A replacement bumper plate for replacing an existing bumper plate of an arm of a wrench assembly for assisting with attaching drill segments to, and/or separating drill segments from, a drill string, the replacement bumper plate shaped for mounting to the arm in a location where the replacement bumper plate receives impact force when the arm makes contact with a drill segment and in a location spaced apart from a cover plate mounted to the arm to cover an access to an interior of a housing of the arm.

20 . The replacement bumper plate of claim 19 wherein the arm is one of a pair of arms, and the replacement bumper plate can separately replace an existing bumper plate on both a first one of the pair of arms of the wrench assembly, or a second one of the pair of arms of the wrench assembly.

21 . The replacement bumper plate of claim 19 wherein the replacement bumper plate is removably mountable to the arm in a manner such that the replacement bumper plate is removable from the arm while the cover plate remains mounted to the arm.

22 . The replacement bumper plate of claim 19 wherein the replacement bumper plate is removably mountable to the arm in a location where the replacement bumper plate is removable from the arm while the cover plate remains mounted to the arm.