Baxter Travenol Laboratories, Inc.

Charles E Hodgson

Stephen G Hauser

James H Macemon

Richard W George

James G Bruni

David L Lessner

George M Coker, Jr

Richard J Range

Daniel F Mendoza

The input polarizer and the output polarizer of a spectrofluorometer are each mechanically identical except for the optical elements, and are constructed as modules which plug into a spectrofluorometer base. Each of the polarizer modules includes a polarizing filter that is rotatable and a self-contained motor drive for rotating the polarizing filter. Each of the motor drives comprises an electric motor mounted on the respective module, a pulley mounted on the respective module and rotatable with actuation of the electric motor, a loop coupling the pulley to the polarizing filter for rotation of the filter with rotation of the pulley, and means for enabling the filter to rotate exactly 90.degree. in opposite directions.

Modular motorized polarizers for a spectrofluorometer

The assembly includes a horizontally disposed sample transfer arm which is mounted to and extends radially outwardly from a vertically positioned cylindrical support member. A drive shaft is coupled by a drive mechanism to the cylindrical member for rotating the cylindrical member a predetermined arcuate distance to move the transfer arm between a first position over a first receptacle and a second position over a second receptacle. Locating stops associated with the cylindrical support member define and limit the arcuate movement of the arm. The drive mechanism includes a lost motion clutch assembly including a flat cam member which has a generally rectangular cross-section, which is fixed to the top of the drive shaft and which is received in a slot in the cylindrical member that extends axially inwardly from one end of the cylindrical member and that has a generally rectangular cross-section greater than the rectangular cross section of the cam member. A wide, generally U-shaped spring clip has a flat bight portion situated within the slot at the inner end thereof and has two leg portions which extend toward each other and which have opposed outer ends which are spaced apart a distance less than the thickness of the cam member. The cam member is received between and engaged by the leg portions of the spring clip within the slot in the cylindrical support member. Overrotation of the drive shaft in excess of the predetermined arcuate distance will cause the cam to turn within the slot and spread the opposed leg portions of the spring clip as movement of the arm is blocked by engagement of the arm with one of the locating stops at one end of the arcuate path of travel of the arm thereby to prevent damage to the assembly.

Sample transfer arm assembly

Proportional dialysis unit

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Silver Spring, MD, United States of America

Charles E Hodgson