Knee ascender assembly for rope climbing
View Patent ↗A secondary ascender system for use in rope climbing and with other rope climbing systems that provides a knee ascender permitting full range of motion and energy capture from two legs by encasing an interior portion of the length of an elastic cord used for tending the knee ascender within a load bearing member. The load bearing member connects a foot attachment to an ascender and transfers loads applied to the foot attachment and via the elastic cord during tending to the ascender to advance up the rope.
1. A knee ascender apparatus comprising:
an elastic cord having a fixed end and a free end defining a length;
a load bearing member having a hollow core open at an aperture, wherein the fixed end of the elastic cord is secured relative to the load bearing member, an interior portion of the length of the elastic cord extends from the fixed end through the hollow core to the aperture, and an exterior portion of the length of the elastic cord extends through the aperture to the free end external to the load bearing member;
a pulley positioned within the hollow core opposite the aperture around which the interior portion of the length of the elastic cord extends;
an ascender secured to the load bearing member adjacent to the aperture; and
a foot attachment depending from the load bearing member.
2. The knee ascender apparatus of claim 1 , wherein the fixed end of the elastic cord is secured relative to the load bearing member adjacent to or in the aperture.
3. The knee ascender apparatus of claim 1 , further comprising a liner secured within the hollow core, thereby defining a cavity having an interior diameter and through which the interior portion of the elastic cord extends, the liner comprising an upper end and a lower end wherein the upper end is positioned in the aperture of the load bearing member.
4. The knee ascender apparatus of claim 1 , wherein the pulley is mounted within a pulley block comprising:
a pulley shell comprising:
a pulley mounting bore; and
a conduit extending from an inlet and around the pulley mounting bore to an outlet;
two flanged bushings; and
the pulley positioned within the pulley mounting bore and secured therein by the two flanged bushings.
5. The knee ascender apparatus of claim 4 , further comprising a liner secured within the hollow core, comprising:
a first cavity having an interior diameter and upper and lower ends, wherein the lower end of the first cavity is longitudinally aligned with and adjacent to the inlet of the conduit of the pulley shell; and
a second cavity having an interior diameter and upper and lower ends, wherein the lower end of the second cavity is longitudinally aligned with and adjacent to the outlet of the conduit of the pulley shell,
wherein the interior portion of the elastic cord extends through the first cavity, the conduit of the pulley shell, and the second cavity.
6. The knee ascender apparatus of claim 5 , wherein the fixed end of the elastic cord comprises a knot sized larger than the interior diameter of the first cavity and positioned outside of the first cavity at the upper end of the first cavity, thereby securing the fixed end relative to the load bearing member.
7. The knee ascender apparatus of claim 6 , wherein the upper end of the first cavity and the upper end of the second cavity are each positioned in the aperture of the load bearing member.
8. The knee ascender apparatus of claim 5 , wherein the liner is flexible and the cavity is incompressible.
9. The knee ascender apparatus of claim 7 , further comprising:
a first rigid end cap having an opening, wherein the first rigid end cap is positioned within the aperture of the load bearing member and is fixed to the upper end of the first cavity; and
a second rigid end cap having an opening, wherein the second rigid end cap is positioned within the aperture of the load bearing member and is fixed to the upper end of the second cavity.
10. The knee ascender apparatus of claim 1 , further comprising a means for attaching the free end of the elastic cord to a harness.
11. The knee ascender apparatus of claim 10 , wherein the means for attaching the free end of the elastic cord to a harness comprises a boat snap tied to the free end of the elastic cord.
12. The knee ascender apparatus of claim 1 , wherein the load bearing member comprises a first strip of webbing and a second strip of webbing stitched together to form the hollow core.
13. The knee ascender apparatus of claim 12 , wherein the foot attachment comprises:
a cinch buckle secured at a distal end of the first strip of webbing opposite the ascender; and
an elongated strapping extension depending from the second strip of webbing.
14. The knee ascender apparatus of claim 1 , wherein the foot attachment comprises:
a loop depending from the load bearing member; and
a carabiner attached to the loop.
15. A knee ascender apparatus for use in rope climbing comprising:
an elastic cord having a fixed end and a free end defining a length;
a load bearing member having a hollow core open at an aperture, wherein the fixed end of the elastic cord is secured relative to the load bearing member, an interior portion of the length of the elastic cord extends from the fixed end through the hollow core to the aperture, and an exterior portion of the length of the elastic cord extends through the aperture to the free end external to the load bearing member;
a pulley positioned within the hollow core opposite the aperture around which the interior portion of the length of the elastic cord extends;
an ascender secured to the load bearing member adjacent to the aperture; and
a means for attaching the load bearing member to a foot.
16. The apparatus of claim 15 , further comprising a means for attaching the free end of the elastic cord to a harness.
17. The apparatus of claim 16 , wherein the means for attaching the free end of the elastic cord to a harness comprises a boat snap tied to the free end of the elastic cord.
18. The knee ascender apparatus of claim 15 , wherein the fixed end of the elastic cord is secured relative to the load bearing member adjacent to or in the aperture.