Cable puller

1. A cable puller for pulling a rope or a cable through a conduit comprising:

an attachment system configured to rigidly secure the cable puller to the conduit from which the rope or the cable is to be pulled;

a puller frame;

at least one capstan rotatably mounted on the puller frame;

a motor operatively coupled with the at least one capstan;

an elongated body extending from the puller frame;

an extension member to which the attachment system is attached, the extension member being movable relative to the body to various positions; and

a locking mechanism configured to lock the extension member and the body together into the various positions, the locking mechanism including a barrel having a passageway extending in an axial direction and an elongated linear slot extending from the passageway to an outer diameter of the barrel, the slot generally extending in the axial direction, a plunger mounted within the passageway, a compressible member positioned within the passageway and engaged with the plunger, and a handle extending from the plunger and through the slot, the handle extending outward from the barrel in a direction which is transverse to the direction in which the slot extends, wherein the handle is configured to translate along the slot, wherein the locking mechanism is configured to be placed into a locked position in which the extension member is fixed relative to the body and is further configured to be placed into an unlocked position in which the extension member is movable relative to the body.

2. The cable puller of claim 1 , wherein the compressible member is expanded when the locking mechanism is in the locked position and is compressed when the locking mechanism is in the unlocked position.

3. The cable puller of claim 2 , wherein the plunger includes a shaft extending from an enlarged head, and the compressible member is positioned between the enlarged head and a wall forming a portion of the passageway, the compressible member surrounding the shaft.

4. The cable puller of claim 3 , wherein the compressible member is a metal coil spring or is formed of rubber.

5. The cable puller of claim 2 , wherein the handle passes through an opening in the plunger.

6. The cable puller of claim 1 , wherein the slot is a first slot, and the barrel further includes a second elongated slot extending from the first slot and extending from the passageway to the outer diameter of the barrel, the second slot being angled relative to the first slot, wherein the handle is further configured to seat within and to move within the second slot.

7. The cable puller of claim 6 , wherein the first slot has upper and lower parallel wall surfaces and inner and outer wall surfaces at opposite ends thereof, and the second slot extends transverse to the first slot and has inner and outer parallel wall surfaces and an end wall at ends of the inner and outer parallel wall surfaces thereof, wherein the end wall is angled.

8. The cable puller of claim 6 , wherein the plunger includes a shaft extending from an enlarged head, and the compressible member is positioned between the enlarged head and a wall forming a portion of the passageway, the compressible member surrounding the shaft.

9. The cable puller of claim 8 , wherein the compressible member is a metal coil spring or is formed of rubber.

10. The cable puller of claim 6 , wherein the first and second slots form a first L-shaped slot, and further comprising a second L-shaped slot extending from the passageway to an outer diameter of the barrel, wherein the handle is configured to seat within and is configured to move within the first and second slots.

11. The cable puller of claim 10 , wherein the compressible member is expanded when the locking mechanism is in the locked position and is compressed when the locking mechanism is in the unlocked position.

12. The cable puller of claim 11 , wherein the plunger includes a shaft extending from an enlarged head, and the compressible member is positioned between the enlarged head and a wall forming a portion of the passageway, the compressible member surrounding the shaft.

13. The cable puller of claim 12 , wherein the compressible member is a metal coil spring or is formed of rubber.

14. The cable puller of claim 1 , wherein the slot is a first slot, and the barrel further includes a second elongated slot extending from the first slot and extending from the passageway to the outer diameter of the barrel, the second slot is helical, wherein the handle is further configured to seat within and to move within the second slot.

15. The cable puller of claim 3 , wherein the extension member has a plurality of spaced apart openings therein, and wherein the enlarged head has a front face which is angled at an angle from a centerline of the plunger, the enlarged head being configured to seat within each of the openings in the extension member with the front face facing in a downward direction.

16. The cable puller of claim 15 , wherein the front face is angled at about 60 degrees from the centerline of the plunger.

17. The cable puller of claim 8 , wherein the extension member has a plurality of spaced apart openings therein, and wherein the enlarged head has a front face which is angled at an angle from a centerline of the plunger, the enlarged head being configured to seat within each of the openings in the extension member with the front face facing in a downward direction.

18. The cable puller of claim 17 , wherein the front face is angled at about 60 degrees from the centerline of the plunger.

19. The cable puller of claim 6 , wherein the second slot is transverse to the first slot.

20. The cable puller of claim 7 , wherein the first and second slots form a first L-shaped slot, and further comprising a second L-shaped slot extending from the passageway to an outer diameter of the barrel, wherein the handle is configured to seat within and is configured to move within both L-shaped slots.