US 3762879 A
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United States Patent 1 1 Moran 1 Oct. 2, 1973 1 LOOP CONVEYOR FOR AUTOMATIC CHEMICAL TESTING APPARATUS  Inventor: John J. Moran, Houston, Tex.
 Assignee: Hycel, Inc., Houston, Tex.
 Filed: June 21,197]
 Appl. No.: 155,153
Related US. Application Data  Division of Scr. No. 737,065, June 14, 1968, Pat. No.
 U.S. Cl. 23/259, 23/253 R  Int. Cl. G0ln 1/14, G01nl/18  Field of Search 23/253, 259, 292;
 References Cited UNITED STATES PATENTS 3,432,271 3/1969 Wasilewski 23/253 R 3,475,130 10/1969 Baruch 23/259 X 3,481,709 12/1969 Slone r 23/259 X 3,487,862 l/l970 Soderblom 23/259 X 3,533,744 10/1970 Ungcr 23/259 X 3,556,731 l/l97l Martin 23/259 X 3,578,412 5/1971 Martin 23/259 Primary Examiner-Morris O. Wolk Assistant ExaminerR. E. Serwin Attorney-James F. Weiler et al.
 ABSTRACT A loop conveyor for automatic chemical testing apparatus having a plurality of rigid slats for carrying a row of reaction tubes intermediate their ends with the open ends extending upwardly above the conveyor and the lower closed ends extending beneath the upper portion of the loop whereby chemical tests may be performed in the tube as the conveyor is indexed along the various positions. Heating means positioned inside the conveyor and movable upward for heating the bottom of some of the tubes and movable downwardly for allowing the conveyor to rotate. Power means for rotating the conveyor and lowering and raising the heating means and moving drying means into and out of the tubes and having a lost motion connection between the power means and the conveyor for allowing the heating means to be lowered and the drying means to be retracted away from the tubes before the conveyor is rotated. A second lost motion connection for allowing the conveyor to be rotated before the heating means is raised and the drying means is moved into the tubes. An indexing pawl engaging the conveyor for allowing the conveyor to index only a predetermined distance, and a locking means for holding the conveyor in a fixed position after each indexing movement.
18 Claims, 68 Drawing Figures lil PAIENTEB 081 21975 (fa/$0 cf Mora/7 I N VENTOR.
SHEET 02 0F 33 JU ULLIULLULUULILILILIUL In I 1H Hlll I III IHH HHIHH PATENTEDUCI 212m SHEU 03 0F 3 INVENTOR.
PATENTEDUBI 2mm sum mar 33 00 00 00 00 0O 00 O0 O0 0 0 O 0 0 O 0 db/Y/Y J Mara/7 INVENTOR.
PATENTEU 2 I975 sum 11 or 33 cfaf/w J Mara/7 1N VENTOR.
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ATTOR/VEVJ PATENTEI] OCT 2 I973 SHEET 18 0F 33 WWW;
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