Abstract: An animal fluid injector, replaceable syringe and method of replacement of the syringe in the injector are provided in which the syringe is loadable and unloadable into and from the injector through the open front end of a pressure jacket of the injector, thereby permitting replacement without retraction of the syringe plunger drive or disconnection of the injection tubing. The syringe is provided with a pressure restraining front end, such as an integral or removable cap with structure such as threads that lock the syringe to the front end of the jacket by mating with threads on the jacket. A mechanism in the injector, which includes, for example, a key on cam ring operated by a lever with one hand of an operator, interacts with structure such asymmetrically spaced notches on the back end of the syringe to, for example, rotate the syringe and simultaneously translate or rotate a coupling on the syringe plunger into and out of engagement with the plunger drive in the injector.

Abstract: A trayless film cassette transport apparatus is disclosed which includes an improved cassette gripping system which allows an x-ray film cassette to be loaded through a window; then gripped and withdrawn inwardly to a properly centered exposure position; then ejected to project partially from the window by a distance switch is automatically determined in accordance with the size of the cassette. This ensures that small cassettes project far enough from the window to be readily grasped by an operator while avoiding ejecting large cassettes so far that they are precariously balanced in the window. The novel gripper holds the cassette securely under a self-locking condition, such that the gripping force on the cassette increases in response to and at a greater rate than an improperly imposed cassette withdrawing force.

Abstract: A data cassette storage and retrieval device is provided having a gripper which moves linearly on the carrier of a cassette transporter to and from a storage crypt. The gripper carries a pair of pins having hooked ends which rotate into and out of engagement with the flange of a disc cassette. The gripper is operated by a mechanism which includes a chain which is driven around a pair of sprockets. The chain carries a drive pin which is linked to the gripper by way of an actuator plate which slides on the gripper only perpendicular to the path of the gripper. The actuator plate has a cam slot which rotates the pins by driving cam followers on the pins as the drive pin moves on the chain around a sprocket. Control switches and motors on the carrier are connected to the drive controls by a printed circuit board through a hollow shaft on which the carrier rotates on a movable elevator carriage of the transporter.