Ferrules for pole and tool extension
A ferrule system includes: a first ferrule comprising a proximal end for engaging a first implement and a threaded portion opposite the proximal end; and a second ferrule comprising a distal portion for engaging a second implement, a proximal portion opposite the distal portion and comprising teeth, a threaded portion intermediate the distal portion and proximal portion and configured to engage the threaded portion of the first ferrule. Teeth are mounted on the first ferrule and are biased to automatically engage the teeth of the proximal portion of the second ferrule as the threaded portion of the first ferrule engages the threaded portion of the second ferrule such that only tightening rotation of the second ferrule relative to the first ferrule is permitted when the teeth mounted on the first ferrule are automatically engaged with the teeth of the proximal portion of the second ferrule.
1 . A ferrule system comprising:
a first ferrule comprising a proximal end for engaging a first implement and a threaded portion opposite the proximal end;
a second ferrule comprising a distal portion for engaging a second implement, a proximal portion opposite the distal portion and comprising teeth, a threaded portion intermediate the distal portion and proximal portion and configured to engage the threaded portion of the first ferrule; and
teeth mounted on a lever pivotably attached to the first ferrule and biased to automatically engage the teeth of the proximal portion of the second ferrule as the threaded portion of the first ferrule engages the threaded portion of the second ferrule such that only tightening rotation of the second ferrule relative to the first ferrule is permitted when the teeth mounted on the first ferrule are automatically engaged with the teeth of the proximal portion of the second ferrule.
2 . The ferrule system of claim 1 , wherein the teeth mounted on the first ferrule are connected to the lever, and the lever is biased by a bias force to automatically pivot to a default locking position at which the teeth mounted on the first ferrule automatically engage the teeth of the proximal portion of the second ferrule.
3 . The ferrule system of claim 2 , wherein the lever is user operable by being moved against the bias force, thereby pivoting the lever out of the default locking position, and disengaging the teeth mounted on the first ferrule from the teeth of the proximal portion of the second ferrule.
4 . The ferrule system of claim 3 , wherein:
the proximal portion of the second ferrule comprises an interior wall;
the teeth of the proximal portion of the second ferrule extend inward from the interior wall; and
the teeth mounted on the first ferrule are connected to a distal end of the lever and extend outward.
5 . The ferrule system of claim 4 , wherein the distal end of the lever is inserted into the proximal portion of the second ferrule.
6 . The ferrule system of claim 4 , wherein:
the teeth mounted on the first ferrule comprise respective distal ends having sloped surfaces; and
the teeth of the proximal portion of the second ferrule comprise respective proximal ends each having a sloped surface.
7 . The ferrule system of claim 6 , wherein, when the threaded portion of the first ferrule is inserted into the proximal portion of the second ferrule, the sloped surfaces of the teeth of the proximal portion of the second ferrule make contact with the sloped surfaces of the teeth mounted on the first ferrule thereby pushing the distal end of the lever inward to ease mutual engagement of the teeth.
8 . The ferrule system of claim 4 , wherein the teeth of the proximal portion of the second ferrule define a ring of teeth encircling a longitudinal axis defined by the second ferrule.
9 . The ferrule system of claim 8 , wherein the teeth of the proximal portion of the second ferrule each have a profile when taken along the longitudinal axis in the shape of a right triangle.
10 . The ferrule system of claim 9 , wherein the teeth of the proximal portion of the second ferrule each comprise:
a base connected to the interior wall;
a locking side oriented perpendicular to the base and extending towards the longitudinal axis; and
a hypotenuse face that forms a slope.
11 . The ferrule system of claim 10 , wherein the teeth mounted on the first ferrule each comprise:
a base connected to the lever;
a locking side oriented perpendicular to the base and extending outward; and
a hypotenuse face that forms a slope.
12 . The ferrule system of claim 11 , during tightening rotation of the second ferrule relative to the first ferrule the hypotenuse faces of the teeth mounted on the first ferrule slide along the hypotenuse faces of the teeth of the proximal portion of the second ferrule causing the lever to pivot from its default locking position.
13 . The ferrule system of claim 8 , wherein the teeth mounted on the first ferrule are connected to a distal end of the lever along an arc of curvature that matches the ring of teeth within the second ferrule for intimate mutual engagement.
14 . The ferrule system of claim 1 , wherein:
the proximal end of the first ferrule comprises a first tube; and
the distal portion of the second ferrule comprises a second tube.
15 . The ferrule system of claim 14 , further comprising the first implement and the second implement, wherein:
the first implement comprises a first pole, a pruner and a rope, a double pulley pruner and a rope, a saw head, a saw blade, a hook saw blade and belting scabbard, and/or a limb and wire raiser, wherein this list is not exhaustive; and
the second implement comprises a second pole, a pruner and a rope, a double pulley pruner and a rope, a saw head, a saw blade, a hook saw blade and belting scabbard, and/or a limb and wire raiser.
16 . The ferrule system of claim 4 , wherein the teeth connected to the distal end of the lever extend outward to engage an equal number of teeth of the proximal portion of the second ferrule.
17 . The ferrule system of claim 3 , wherein a distal end of the lever comprises a tab trapped in a slot defined by the first ferrule thereby movably coupling the distal end of the lever to the first ferrule and preventing the lever from swinging therefrom.