Mineral mining cutting pick, cutting pick seat, and assembly thereof

Abstract

The present invention provides a mineral cutter cutting pick, which has an oblong section to define leading (3), trailing (4) and side (5) faces of a shank (2), and hence has longitudinal and transverse axes (6, 7). The shank (2) is provided with a single, circular section through hole (16) extending orthogonally across its side faces (5), in which hole (16) is fitted a resilient member (17) of circular section with an external diameter to match that of the hole (16), the resilient member (17) itself having a coaxial through hole (18) so as to provide an annulus of constant thickness when uncompressed and adapted, in use, after the pick shank (2) has been inserted into a shank-receiving aperture (22) of a pick box (5), to itself receive, and frictionally retain, a manually insertable, and manually removable, metal pin (23) adapted to project beyond the side faces (5). The metal pin (23) is suitable to exceed the side surface (5), thereby enabling the metal pin (23) to be knocked into any one side of the handle portion (2).

Description

technical field [0001] The present invention relates to picks, pick holders, and combinations of picks and pick holders in which a shank of a replaceable pick for a mining operation is disposed. Background technique [0002] For example, GB1062752 discloses a so-called stab-lock pick which has been the industry standard for almost 40 years, particularly in coal mining. As can be seen, the stab-locking pick has a shank with an acute-angled through-hole through the cheek, in which is fixed a resilient pad on which is permanently provided a metal pin with a protruding end that Adapted in use to engage an L-shaped groove machined in the cheek of the pick holder to releasably latch the pick on the pick holder. [0003] However, the need to machine the L-shaped slots in the two cheeks of the pick holder, the attendant machining costs and the resulting metal removal of the pick holder, necessarily leads to a weakening of the pick holder, which is important if the pick Side loads ...

AI Technical Summary

Problems solved by technology

[0003] However, the need to machine the L-shaped slots in the two cheeks of the pick holder, the attendant machining costs and the resulting metal removal of the pick holder, necessarily leads to a weakening of the pick holder, which is important if the pick side loads, which cause the cheeks to break off the pick holders from time to time

Since the pick holders are welded around the periphery of the rotary cutting head of a planer or continuous excavator, typically with 50-70 picks on the cutter head, it is often necessary to remove damaged pick holders Breakage of a certain number of pick holders can be tolerated before replacing damaged pick holders with new ones, which can cause unplanned production effects if replacement of damaged pick holders is not part of pre-planned maintenance loss

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