Abstract: A hypodermic syringe assembly which is self-sheathing in that use of the syringe activates a locking mechanism which automatically and irreversibly causes a hypodermic needle to be retracted into an outer sheath. As a result, the syringe assembly is automatically and permanently made safe to handle by the user. In addition, reuse of the syringe is prevented by the locking mechanism, in that the locking mechanism serves to puncture the syringe if an attempt is made to reuse the syringe. The syringe includes a tubular-shaped sheathing member having an apertured end through which the hypodermic needle extends when the syringe is in use. Telescopically disposed within the sheathing member is a tubular-shaped insert having one end which is open to receive a plunger, with the other end being provided with an aperture and boss for receiving the hypodermic needle.

Abstract: Apparatus for finishing or polishing a surface of a lens with a finishing tool. The apparatus includes a main frame, a shaft pivotally mounted to the main frame, and eccentric drive means driving the shaft in a predetermined orbital motion. Lens finishing means are fixedly secured to one end of the shaft. A lens carrier is slidably mounted to the main frame such as to be reciprocable along a path perpendicular to the orbital axis of the shaft. The lens is removably mounted to the carrier and is biased by a biasing device against the lens finishing tool.