Double-lock carabiner

1. A locking carabiner comprising:

a body comprising a first end and a second end;

a gate rotatably coupled to the second end about a gate axis; and

a locking mechanism rotatably coupled to the gate about a locking mechanism axis, wherein the locking mechanism is configured to engage with the first end, wherein the gate axis is substantially parallel to, and offset from, the locking mechanism axis, and wherein the rotation of the locking mechanism is in a substantially similar plane as the rotation of the gate,

wherein the locking carabiner is movable between a first condition in which the gate is closed and the locking mechanism is locked, a second condition in which the gate is closed and the locking mechanism is unlocked, and a third condition in which the gate is open and the locking mechanism is unlocked, wherein when the gate is closed, the gate is in contact with the first end, and when the gate is open, the gate is positioned away from the first end, and wherein when the locking mechanism is locked, the locking mechanism prevents the gate from opening, and when the locking mechanism is unlocked, the locking mechanism enables the gate to open, and

wherein the gate rotates in a substantially similar direction as the locking mechanism when moving between the first condition, the second condition, and the third condition.

2. The locking carabiner of claim 1 , wherein the gate and the locking mechanism are biased so as to rotate automatically towards the first condition.

3. The locking carabiner of claim 1 , wherein the gate defines a longitudinal axis, and wherein the locking mechanism comprises a lever arm rotatably coupled to the gate and extending substantially along the longitudinal axis, the lever arm comprising a free end configured to be positioned proximate the first end and in a blocking position so as to prevent the gate from opening.

4. The locking carabiner of claim 3 , wherein the locking mechanism further comprises a bias spring disposed opposite the free end and configured to bias the lever arm toward the first condition.

5. The locking carabiner of claim 1 , wherein the gate further comprises a bias spring disposed proximate the second end and configured to bias the gate toward the first condition.

6. The locking carabiner of claim 1 , wherein the gate comprises a concave portion, and wherein the locking mechanism is disposed at least partially within the concave portion.

7. The locking carabiner of claim 6 , wherein the concave portion is sized and shaped to receive a zip line wire.

8. The locking carabiner of claim 7 , wherein a force applied to the locking mechanism rotates the locking mechanism about the locking mechanism axis.

9. The locking carabiner of claim 1 , wherein the body is substantially C-shaped.

10. The locking carabiner of claim 9 , wherein the body includes a spine opposite the gate, and wherein the spine comprises a curved section.

11. The locking carabiner of claim 9 , wherein at least a portion of a top end of the body comprises a substantially circular cross-section.

12. The locking carabiner of claim 11 , wherein at least a portion of a bottom end of the body comprises a substantially circular cross-section.

13. A locking carabiner comprising:

a body comprising a first end and a second end;

a gate rotatably coupled to the second end about a gate axis;

a locking mechanism rotatably coupled to the gate about a locking mechanism axis, wherein the locking mechanism is configured to engage with the first end, wherein the gate axis is substantially parallel to, and offset from, the locking mechanism axis, and wherein the rotation of the locking mechanism is in a substantially similar plane as the rotation of the gate; and

a trolley rotatably coupled to the body.

14. The locking carabiner of claim 13 , wherein the trolley comprises:

two side plates;

a first sheave rotatably mounted between the two side plates;

a second sheave rotatably mounted between the two side plates; and

an anchor point defined within the two side plates for receiving the locking carabiner, wherein the anchor point is positioned at a midpoint between the first sheave and the second sheave and above a zip line when the trolley is installed on the zip line.

15. The locking carabiner of claim 14 , wherein the trolley further comprises a bushing positioned within the anchor point, and wherein the bushing is substantially circular for receiving a corresponding top end of the body of the locking carabiner.

16. The locking carabiner of claim 14 , wherein a top end of the trolley comprises:

a slot and a hook defined by the top end; and

an accessory connection point positioned adjacent to the slot and defined within the two side plates.

17. The locking carabiner of claim 16 , wherein the slot and the accessory connection point are both offset from the midpoint.

18. A locking carabiner comprising:

a substantially C-shaped body comprising a first end and a second end and defining a chamber therein;

a gate rotatably coupled to the second end, wherein the gate is rotatable between a closed position where the gate contacts the first end and an open position where the gate is positioned away from the first end, and wherein the gate is biased to rotate automatically towards the closed position; and

a locking mechanism rotatably coupled to the gate and disposed on an exterior side of the gate relative to the chamber, wherein the locking mechanism is rotatable between a locked position where the locking mechanism is in a blocking position with respect to the first end to prevent the gate from opening and an unlocked position where the locking mechanism is out of the blocking position with respect to the first end to enable the gate to open, wherein the locking mechanism is biased to rotate automatically towards the locked position, and wherein a direction the gate rotates between the open position and the closed position is substantially similar to a direction the locking mechanism rotates between the locked position and the unlocked position.