Fuji Seiki Inc.

Tsutomu Taniguchi

Hubert Boesch

A valve open-close indicating apparatus comprises a cylindrical housing having two opposite ends in the axial direction thereof, a sleeve arranged in the housing for axial reciprocation between the opposite ends of the housing, and a cylindrical elastic member for urging the sleeve from both outer sides with respect to the axial direction so that the sleeve is normally situated in an intermediate position between the opposite ends. When a piston moves toward one end of the housing to open a valve, the sleeve is pressed toward the one end against the urging force of the cylindrical elastic member, and the indicating apparatus indicates 'open.' When the piston moves toward the other end to close the valve, the sleeve is pressed toward the other end against the urging force, and the indicating apparatus indicates 'closed.' When the piston is situated between the opposite ends, the sleeve is restored to the intermediate position by means of the cylindrial elastic member without being pressed by the piston, and the indicating apparatus indicates nothing. The sleeve is normally restored to the intermediate position by means of the cylindrical elastic member, and is moved as required, toward either of the opposite ends by means of the piston.

Valve open-close indicating apparatus

A valve operating mechanism produces a rotating force for causing a valve body of the valve to shift relative to a valve seat thereof, so that the valve is opened and closed. A piston of the mechanism produces a rectilinear reciprocating force. A screw member is supported moveably along the rectilinear line and unrotatably in the housing and includes a pair of pawls helically projecting along the rectilinear line and a helical interval space defined between the helical pawls. A pivot is inserted into the helical interval space. A cylindrical rotating member is supported rotatably and unmoveably along the rectilinear line in the housing so as to surround the screw member. When the screw member receives the rectilinear reciprocating force to perform the reciprocating motion along the rectilinear line, the pivot is urged to rotate along the helical interval space in the rectilinearly unmoved state, and the cylindrical rotating member can rotate with the pivot. Therefore the cylindrical rotating member can output the rotating force for causing the valve body of the valve to shift relative to the valve seat thereof.

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Yokohama, Japan

Tsutomu Taniguchi