Arrangement for exchanging pole piece systems in corpuscular radiation apparatus

Claim 1

IN AN ARRANGEMENT FOR USE IN A CORPUSCULAR RAY DEVICE, IN PARTICULAR AN ELECTRON MICROSCOPE, FOR THE INSERTION OF A POLE SHOE SYSTEM OR PARTS THEREOF INTO THE BORE OF THAT PORTION, WHICH PRODUCES THE MAGNETIC FLUX, OF A MAGNETIC POLE SHOE LENS LATERALLY SURROUNDING AN INSERTED POLE SHOE SYSTEM, AND THE REMOVAL OF SUCH SYSTEM OR PARTS THEREOF FROM SUCH BORE, THE COMBINATION OF CONTROL MEANS FOR IMPARTING A LONGITUDINAL MOTION IN THE DIRECTION OF THE RADIATION AXIS TO SUCH A POLE PIECE SYSTEM OR PARTS THEREOF, CONTROL MEANS FOR IMPARTING TO SUCH POLE PIECE SYSTEM OR PARTS THEREOF, WHEN REMOVED FROM THE BORE, A ROTARY ANGULAR MOTION TRANSVERSE TO THE RADIATION AXIS, AND DRIVE MEANS FOR SAID CONTROL MEANS OPERATIVE TO ACTUATE SAID FIRST-MENTIONED CONTROL MEANS FOR RESPECTIVELY EFFECTING INSERTION OF THE POLE PIECE SYSTEM OR PARTS THEREOF INTO THE BORE OF SAID POLE PIECE LENS AND REMOVAL THEREFROM, AND TO ACTUATE SAID SECOND MENTIONED CONTROL MEANS FOR RESPECTIVELY EFFECTING MOVEMENT OF THE POLE PIECE SYSTEM OR PARTS THEREOF AWAY FROM AND TOWARDS THE RADIATION AXIS, FOLLOWING REMOVAL THEREOF FROM THE BORE OF SAID POLE PIECE LENS.