Averruncator

[Image:Averruncator.png|thumb|200px|Fig.1 shows the handle and head of an averruncator. Fig. 2 shows the head in use.]
An averruncator or pole pruner is a form of long shears used in arboriculture for averruncating or pruning off the higher branches of trees, etc.

Etymology

The word averruncate glided into meaning to weed the ground, prune vines, etc., by a supposed derivation from the Lat. ab, "off", and eruncare, "to weed out", and it was spelt aberuncate to suit this; but the New English Dictionary regarded such a derivation as impossible.

Description

An averruncator has a compound blade attached to a handle between five and eight feet long. The blades are closed with a rope and pulley, and they are opened with a spring.

Types

There are at least three varieties of this tool, depending on how force is transmitted to the blades or the blade shape: shear-action, pully-action and parrot-bill.