Underwater spear gun

Claim 1

AN UNDERWATER SPEAR GUN COMPRISING A CYLINDER, A PISTON MOVABLE WITHIN SAID CYLINDER, TRIGGER MEANS TO EFFECT ENGAGEMENT WITH SAID PISTON AFTER A PREDETERMINED TRAVEL THEREOF IN A FIRST DIRECTION AND ACTUABLE TO RELEASE SAID ENGAGEMENT, BIAS MEANS OPERABLE TO BIAS SAID PISTON TOWARD A SECOND DIRECTION, COCKING MEANS FOR OPERATING SAID BIAS MEANS AFTER SAID PREDETERMINED TRAVEL, BARREL MEANS IN FLUID COMMUNICATION WITH SAID CYLINDER AND ADAPTED TO HOUSE A SPEAR, SAID BIAS MEANS WHEN OPERATED BEING OPERATIVE UPON ACTUATION OF SAID TRIGGER MEANS TO MOVE SAID PISTON IN SAID SECOND DIRECTION TO FORCE FLUID FROM SAID CYLINDER AND THROUGH SAID BARREL MEANS WHEREBY ANY SPEAR WHICH MAY BE HOUSED WITHIN SAID BARREL MEANS IS DRIVEN OUTWARDLY, AND A SLEEVE DISPOSED ABOUT SAID BARREL MEANS AND CLOSED AT EACH END TO FORM A HERMETICALLY SEALED ANNULAR SPACE TO PROVIDE BUOYANCY FOR SAID UNDERWATER SPEAR GUN, SAID COCKING MEANS COMPRISING A COCKING ELEMENT AND A LOST MOTION CONNECTION BETWEEN SAID COCKING ELEMENT AND SAID PISTON, SAID COCKING ELEMENT BEING RELATIVELY MOVABLE WITH RESPECT TO SAID PISTON IN THE DIRECTION OF MOVEMENT OF SAID PISTON AND SAID BIAS MEANS ACTING BETWEEN SAID COCKING ELEMENT AND SAID PISTON.