Abstract: A screen door assembly (61) on the bottom of a combine serves to screen large pieces of foreign material from air flowing to a fan (49) and to provide access for service personnel to an interior cavity (53) of the combine. A screen (62) is moved between a closed horizontal position and an open position, shown by broken lines (62"), by a crank arm member (63) which can be operated (pivoted) by a wrench (91) engaged with the hex head (89) of a shaft portion (86). A pin (111) locks the crank arm member (63), and the screen in their screen closed position in which the screen and arms rest on laterally inward extending flanges (106, 107). The rear edges (116, 117) of the flanges (106, 107) serve to guide the screen (62) to its open position as the crank arm member (63) is rotated counterclockwise, as viewed in FIG. 2 from its full line screen closed position to its screen open position shown by broken lines (63").

Abstract: The invention is an improved liquid measuring device which can be used as a proportioner, dispenser or flow meter for a single fluid or for an unlimited number of fluids. The device embodies a free-floating piston sealed within a cylinder capped at both ends, a high-resolution detector system, either optical or electrical, to accurately determine the piston location within the cylinder, and a microprocessor which converts the lateral movement of the piston within the cylinder into volume measurements of the fluid in the cylinder.

Abstract: A dialysate bag assembly suitable for continuous ambulatory peritoneal dialysis includes a plurality of unfilled, expansible dialysate bags. An expansible container includes a plurality of compartments, each bag being removably positioned in one of those compartments. A filling feedline is detachably connected to each bag for providing dialysate from a source to each bag. The bags and the container are adapted to expand as the bags are being filled with the bags being engageable against the walls of the compartments to maintain the bags in relatively tight engagement. Each bag includes an opening for emptying dialysate which has been delivered to the same from the source.

Abstract: A collapsible disposable container for dilution and delivery of chemicals for in vivo use which includes a combination adsorbent and absolute filter for effecting sterilization and removal of endotoxins and organic contaminants from a diluent introduced into the container prior to in vivo use thereof. Such combination may be in the container inlet, container outlet or in the main storage portion thereof. Unsterilized diluent can be employed for diluting chemicals in the container.

Abstract: A pipetter for drawing fluid into capillary tubes and the like. A capillary tube is forced into an adapter coupled to one end of a vented, flexible tube. A compression wheel rides in a guideway adjacent the tube, and is rolled to continuously vary the point at which the tube is compressed in the manner of a peristaltic pump. Manual rolling of the wheel away from the capillary tube produces sufficient suction in the tube to cause liquid to be drawn into it. The pumping action is reversible in that rolling the wheel back toward the capillary tube will cause fluid to be expelled. Provision is made to prevent undesirable "compression set" as a result of long term static of the flexible tube during periods of non-use.

Abstract: A recorder pen is mounted on the sample scanning stage of an electrophoretic sample analyzer. Movement of the stage scans the sample optically while, at the same time, the recorder pen produces an analog record of the optical analysis. A sample holder is mounted in the stage for detented movement in the direction orthogonal to the scanning motion of the sample stage. The sample holder can be moved to one of several detented positions so that different tracks of the samples are scanned.

Abstract: An automatic recording fluorometer/densitometer has an integral viewer for viewing and photographing fluorescent samples which have been applied to a clear, thin-film substrate. Light from an ultraviolet source is on the opposite side of the sample from the viewer when the sample is placed in a viewer holder. When the sample is placed in a recording holder, light from the same source is on the opposite side of the sample from the recorder optics. By having the source on the opposite side from the optics, it is possible to have the source much closer to the sample and to thereby reduce the stray ultraviolet light in the instrument. Another source emits visible light for densitometric analysis of the sample. A movable filter holder can be indexed to different positions for placing an ultraviolet filter or one of the densitometric filters in the optical path between the sources and the recording device.