HYDRAULIC OPERATED INDEXING APPARATUS FOR SLEEVE TYPE CORE BARREL

Japanese Patent JPS60105794

A

A coring tool (10), which includes a flexible wire mesh (28) in which the core is disposed, includes a mechanism for maintaining tension on the wire mesh sleeve (28) which then seizes the core disposed within the sleeve (28), and which serves to retain the core and maintain it under tension. The sleeve (28) is maintained under tension by tensile force transmitted to the sleeve (28) through a stripper tube (34). The stripper tube (34) is axially disposed through a piston ratchet assembly (50) connected to a piston (40) slidable within the tool member (16). The piston (40) is resiliently urged upward within the tool member (16) by a return spring (42) but is longitudinally forced downward within the tool member (16) and advanced downwardly with respect to the stripper tube (34) by an increase in pressure within the drill string thereby compressing the return spring (42). The piston ratchet assembly (50) prevents the piston (40) from moving longitudinally upward with respect to the stripper tube (34) and thereby allows the resilient force of the preloaded spring (42) to be applied through the piston (40) and piston ratchet assembly (50) to the stripper tube (34) as a tensile force on the wire mesh sleeve (28). A fixed ratchet assembly (52) is provided within the coring tool (10) to prevent any downward movement of the stripper tube (34) through the fixed ratchet assembly (52) thereby maintaining tension on the stripper tube (34) while the piston (40) is being advanced in response to an increase in fluidic pressure. A decrease in fluidic pressure allows the full force of the return spring (42) to be applied to the stripper tube (34). By means of this combination of elements the coring operation may be continuously practiced while the piston (40) is cyclically advanced compressing the spring (42); and the spring (42) allowed to relax as additional core length is cut; while all the time maintaining the stripper tube (34), sleeve (28) and core under tension.

WO/1999/020870	CORE DRILL
WO/1994/017386	MATERIAL SAMPLING METHOD AND DEVICE
WO/1995/004870	SOIL SAMPLER FOR ANALYSIS FOR FERTILIZER DETERMINATION

JIMII ERU KIYARORU
JIEEMUZU TEII OOMAN

JP20840884A

June 11, 1985

October 05, 1984

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CHRISTENSEN INC NORTON

E21B25/06; (IPC1-7): E21B25/00

Aoki Akira

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