LATCH LOCKING DEVICE IN WIRE LINE UNIT

Japanese Patent JP3799699

B2

PROBLEM TO BE SOLVED: To solve the defect of slipping-off from a set place of a core inner tube assembly that in an conventional art, a latch is closed by a maloperation by vibrations during excavation and excess back-flow water during excavation works after setting at a fixed place of the core inner tube assembly inserted into a core inner tube and the core inner tube assembly is often slipped off from the set place of the core inner tube assembly in a wire line unit which has been sued for sampling a core in a conventional boring machine.
SOLUTION: When a rod 31j is projected to the inside on the reverse side of a spear 31a dispose date the base end of a core barrel head 31. To which a latch 31b is attached pivotally, and the latch 31b is fitted into the recessed section 11a of an outer tube 10, the latch locking device in the wire line unit is constituted so that the latch 31b cannot be closed while holding the rod 31j. Even when a non-core inner tube assembly conducting boring without sampling a core is used in place of the core inner tube assembly, an object is accomplished when the core barrel head having the same structure is employed.

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Tetsuya Endo
Takeshi Banri
Uto Gioki

JP35200996A

July 19, 2006

December 11, 1996

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Mining Industry Co., Ltd.

E21B17/02; E02D1/04; E21B25/04; (IPC1-7): E21B17/02; E02D1/04; E21B25/04

JP7011860A
JP44000642B1
JP48029486A
JP53006081B1

Eiichi Saito
Masami Hattori

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