Auto-lock compact rope descent device
A descent control device is disclosed manufactured with a bar having holes for guiding a rope used in descent, and a lever designed to pivot or move relative to the bar and compress the opening of one of the holes. Compressing the opening increases friction and slows or stops descent. Control can be from manually moving the lever or by connecting the lever to the descending weight, thereby automatically moving the lever. Hole and pivot geometry may be altered to provide multiple braking options, accommodate varying ropes, and alter normal operating friction.
1. A descent control device, comprising:
a bar of a width to be gripped by one hand, the bar having
a plurality of path holes defining a rope path, the path holes aligned approximately linear;
a rope control hole, the rope control hole positioned towards an end of the bar and aligned approximately linear with the plurality of path holes;
a horizontal slot in a side of the bar, the horizontal slot encompassing the control hole; and
a hinge hole;
a lever pivotally connected to the bar at the hinge hole through a hinge pin, the lever having
an attachment hole; and
a constricting hole;
wherein the lever fits into the slot of the bar such that both when fully closed against the bar and when fully open away from the bar the constricting hole of the lever is moved away from alignment with the control hole of the bar therein constricting the rope path, and at a point in between fully open and fully closed the constricting hole overlaps with the control hole creating an open path through the control hole; and
wherein applying force at the attachment hole in a direction away from the bar assists with pivoting the lever towards either fully open away from the bar or fully closed against the bar, thereby easing control by constricting the passage of a rope through the space formed by the control hole and the constricting hole.
2. The descent control device of claim 1 , wherein there are three path holes.
3. The descent control device of claim 1 , wherein a surface edge of each hole is rounded.
4. The descent control device of claim 1 , wherein the hinge hole comprises a slotted hinge.