Importance

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Abstract

A holder for a pick and the combination of a pick and holder. The pick 1 has a shank 4 received in a socket 6 of a holder 2. The holder 2 carries in its socket 6 a tubular spigot 13 which mates in sealed manner with a coupling socket 15 in the pick shank to provide communication for water flow from a supply passage 16a through the pick 1 to outlet ports 12. A shoulder 8 on the spigot 13 abuts a sealing ring 18 in the coupling socket 15 to retain the pick in the holder and permit relative longitudinal displacement therebetween. Carried by the tubular spigot 13 is a valve having an actuating rod 22 which extends through the bore of the spigot. A valve head 24 on the rod 22 is seatable on a shoulder 23a to close off water flow through the bore of the spigot. The end 26 of the rod 22 abuts the pick and during displacement of the pick into its holder in response to cutting engagement of the pick with the mineral, the valve head 24 is displaced to permit water flow to the ports 12. When the pick disengages from the mineral, water pressure on the pick and valve head 24 closes the valve head to seal against the shoulder 23a.

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First Claim