Apparatus for preparation of samples for spectrographic analysis

Details Apparatus for preparation of samples for spectrographic analysis Apparatus for preparation of samples for spectrographic analysis

1991-01-29

1993-03-30

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Molding pressure control means responsive to pressure at...

91362, 100 51, 251322, 425167, 425170, B29C 4300

Patent

active

051982412

ABSTRACT:
An apparatus for compressing a workpiece is disclosed. The apparatus has a die to receive the workpiece in powdered or other form. An abutment holds the workpiece in a fixed position against the application of force, while a hydraulic cylinder is positioned to exert force against the die in the direction toward the abutment. A pump feeds hydraulic fluid to the hydraulic cylinder, and a pressure control valve is coupled to the hydraulic cylinder to control the maximum pressure in the hydraulic cylinder. The pressure control valve has a sealing member, a seat which engages the sealing member with the sealing member closing the outlet, a spring which urges the sealing member towards the seat, closing the outlet, and a backing member putting the spring under compression by maintaining a distance between the backing member and the seat. A stepping motor is rigidly mounted with respect to the seat. The stepping motor has a shaft which may be advanced towards and away from the valve seat whereby the degree of compression on the spring may be adjusted.

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