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US 4,730,933 AGranted
Photometric measuring apparatus
OwnerWilli Lohrinventor
Life of this patent
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OwnerWilli Lohrinventor
Estimating the term…
A photometric measuring apparatus having a measuring chamber which can be cut off from extraneous light when a sample vessel is inserted and removed from the open end of the measurement chamber. A plunger, having a light-tight seal, movable vertically and horizontally on a pivotable arm driven by a drive mechanism for sealing the measuring chamber after a sample vessel is inserted in the measuring chamber. A guide means comprising a cylindrical guide tube having a guide groove on its surface which acts as cam means for controlling the vertical and horizontal movement of the plunger. The drive mechanism includes a drive motor and photocells for controlling the drive of the motor and vertical movement of the plunger and drive of the motor until the sample vessel upon which measurements have been completed are removed. The drive motor is spring mounted and actuates a microswitch to interrupt the motor drive when the drive is obstructed by the operator.
A photometric measuring apparatus having a measuring chamber with an open top for receiving a sample vessel containing material to be measured, a first sealing means in said chamber for sealing said measuring chamber from extraneous light when said sample vessel is removed, a plunger for insertion into said open top of said measuring chamber after a sample vessel to be measured is positioned in said measuring chamber, a second sealing means on said plunger for sealing said measuring chamber from extraneous light when said plunger is inserted into said open top of said measuring chamber, a vertically slidable and horizontally pivoted arm on said plunger for pivoting said plunger and aligning said plunger with said open top of said measuring chamber characterized in a guide means for guiding said vertically slidable and horizontally pivotal arm for vertical and pivotal movement and a drive mechanism for driving and controlling said vertical and horizontal movement of said arm and said plunger.
Dependencies are inferred from the claim text.