Strand grab and ladder including the same
A strand grab includes a frame including a mounting portion and a hook portion having a first end attached to the mounting portion and extending in an arc shape to a second end, a gate member rotatably attached to the mounting portion, a jaw member rotatably attached to the mounting portion, and a connector member coupled between the gate member and the jaw member. The gate member, the jaw member, and the connector member are operatively coupled such that when the gate member rotates toward the first end of the hook portion, the connector member causes the jaw member to rotate toward the first end of the hook portion.
1. An apparatus for use with a ladder, the apparatus comprising:
a frame including a mounting portion and a hook portion having a first end attached to the mounting portion and extending in an arc shape to a second end;
a gate member rotatably attached to the mounting portion of the frame at a first pivot;
a jaw member rotatably attached to the mounting portion of the frame at a second pivot; and
a connector member coupled between the gate member and the jaw member,
wherein the gate member is rotatable between a first position proximate the second end of the hook portion and a second position proximate the first end of the hook portion,
wherein the gate member is structured to rotate from the first position toward the first end of the hook portion when the strand grab is lowered onto a strand such that the strand applies a force against the gate member, and
wherein the gate member, the jaw member, and the connector member are operatively coupled such that when the gate member rotates toward the first end of the hook portion, the connector member causes the jaw member to rotate toward the first end of the hook portion.
2. The apparatus of claim 1 , further comprising:
a latch attached to the frame,
wherein the gate member includes an engagement hole, and
wherein the latch is structured to engage with the engagement hole when the gate member is in the second position to latch the gate member into the second position.
3. The apparatus of claim 2 , wherein the latch is spring loaded and is structured to automatically engage and latch the gate member in the second position when the gate member reaches the second position, and wherein the latch member is structured to release the gate member from the second position when the latch is pulled away from the frame.
4. The apparatus of claim 1 , further comprising:
a spring structured to bias the connector member to rotate with respect to the gate member.
5. The apparatus of claim 4 , wherein the gate member includes a stop pin and the connector member includes a stop portion, wherein the stop pin is structured to abut against the stop portion to stop rotation of the connector member with respect to the gate member, and wherein the spring is structured to bias the connector member to rotate such that the stop portion abuts against the stop pin.
6. The apparatus of claim 5 , wherein the connector member includes a slot and the jaw member includes a slot pin that extends into the slot and is structured to slide along the slot, and wherein rotation of the connector member causes a side of the slot to press against the slot pin and cause the jaw member to rotate.
7. The apparatus of claim 6 , wherein the spring is structured to bias the connector member to rotate in a direction with respect to the gate member that biases the jaw member to rotate toward the gate member.
8. The apparatus of claim 7 , wherein the jaw member is structured to rotate away from the gate member when a force sufficient to overcome the bias of the spring is applied to the jaw member.
9. The apparatus of claim 8 , wherein when the jaw member is rotated away from the gate member such that an angle between the jaw member and the gate member is about 90°, the stop pin is structured to abut against the connector member and prevent the jaw member from rotating further away from the gate member.
10. The apparatus of claim 4 , wherein the spring is a torque spring disposed about the first pivot, and wherein the torque spring includes a first arm structured to apply a first bias against the connector member and a second arm structured to apply a second bias against the stop pin.
11. The apparatus of claim 1 , wherein the connector member includes a slot, wherein the gate member includes a gate slot pin that extends into the slot, and wherein the jaw member includes a jaw slot pin that extends into the slot.
12. The apparatus of claim 11 , wherein rotation of the gate member toward the first end of the hook portion is structured to cause the gate slot pin to press against an upper side of the slot and cause the connector member to rotate, and wherein upward rotation of the connector member is structured to cause a bottom side of the slot to press against the jaw slot pin and cause the jaw member to rotate.
13. The apparatus of claim 12 , wherein the frame includes a frame slot formed therein, wherein the connector member includes a connector pivot that extends into the frame slot, wherein the connector member is structured to rotate about connector pivot, and wherein the connector pivot is structured to slide along the frame slot.
14. The apparatus of claim 13 , further comprising:
a spring structured to bias the connector pivot toward a first end of the frame slot.
15. The apparatus of claim 14 , wherein the connector pivot is structured to slide away from the first end of the frame slot when a force is applied to the jaw member to rotate the jaw member away from the gate member.
16. The apparatus of claim 15 , wherein when the jaw member is rotated away from the gate member such that an angle between the jaw member and the gate member is about 90°, the connector pivot is structured to abut against a second end of the frame slot and prevent the jaw member from rotating further away from the gate member.
17. A ladder comprising:
a pair of rails;
a pair of rungs extending between the rails;
a mounting piece attached between the pair of rungs; and
an apparatus rotatably attached to the mounting piece, the apparatus including:
a frame including a mounting portion and a hook portion having a first end attached to the mounting portion and extending in an arc shape to a second end;
a gate member rotatably attached to the mounting portion of the frame at a first pivot;
a jaw member rotatably attached to the mounting portion of the frame at a second pivot;
a connector member coupled between the gate member and the jaw member,
wherein the gate member is rotatable between a first position proximate the second end of the hook portion and a second position proximate the first end of the hook portion,
wherein the gate member is structured to rotate from the first position toward the first end of the hook portion when the apparatus is lowered onto a strand such that the strand applies a force against the gate member, and
wherein the gate member, the jaw member, and the connector member are operatively coupled such that when the gate member rotates toward the first end of the hook portion, the connector member causes the jaw member to rotate toward the first end of the hook portion.
18. The ladder of claim 17 , wherein the apparatus is rotatable between a stowed position and a deployed position, wherein, in the stowed position, the apparatus does not extend beyond a width of the rails.
19. The ladder of claim 17 , wherein the mounting portion includes a pair of mounting pivots structured to couple the apparatus to the mounting piece.