Automatically retractable needle syringe

Claim 1

A HYPODERMIC SYRINGE, COMPRISING; AN ELONGATED TUBULAR BODY HAVING A FIRST BORE PORTION IN ONE END THEREOF FOR SLIDABLY RECEIVING A TUBULAR CARPULE, AND A SECOND BORE PORTION AT THE OTHER END THEREOF ALIGNED WITH AND ADJACENT TO SAID FIRST BORE PORTION; MANUALLY OPERABLE PLUNGER MEANS CARRIED BY SAID ONE END OF SAID TUBULAR BODY, SELECTIVELY ENGAGEABLE WITH SAID CARPULE TO SLIDE THE SAME WITHIN SAID TUBULAR BODY AND TO EFFECT SELECTIVE EMPTYING THEREOF; A HUB MOUNTED ON SAID OTHER END OF SAID TUBULAR BODY, AND HAVING AN AXIAL BORE THERETHROUGH ALIGNED WITH SAID FIRST AND SECOND BORE PORTIONS; A PISTON RECEIVED WITHIN SAID SECOND BORE PORTION, AND HAVING A BORE THERETHROUGH ALIGNED WITH SAID AXIAL HUB BORE; A HOLLOW NEEDLE POINTED AT BOTH ENDS THEREOF, SAID NEEDLE EXTENDING THROUGH AND BEING SECURED WITHIN SAID PISTON BORE, AND BEING TRANSLATABLE WITHIN SAID AXIAL HUB BORE; THE OPPOSITE ENDS OF SAID NEEDLE EXTENDING FOR A SUBSTANTIAL DISTANCE FROM THE OPPOSITE SIDES OF SAID PISTON; ABUTMENT MEANS WITHIN SAID TUBULAR BODY AT THE JUNCTION OF SAID FIRST AND SAID SECOND BORE PORTIONS, SAID PISTON BEING ENGAGEABLE WITH SAID ABUTMENT MEANS TO LIMIT MOVEMENT OF SAID PISTON TOWARD SAID FIRST BORE PORTION AND RESILIENT MEANS ARRANGED TO BIAS SAID PISTON AND SAID NEEDLE AWAY FROM SAID HUB AND TOWARD SAID FIRST BORE PORTION, TO ENGAGE SAID PISTON WITH SAID ABUTMENT MEANS.