Aspirating piston and plunger coupling

• US 3,115,135 A
• Filed: 03/12/1962
• Issued: 12/24/1963
• Est. Priority Date: 03/12/1962
• Status: Expired due to Term

• Current Assignee: Stanley J. Sarnoff
• Original Assignee: Stanley J. Sarnoff
• Inventors: Sarnoff, Stanley J.
• Application Number:
  US04/179,085
• Time in Patent Office: 652 Days
• US Class Current: 604/228
• CPC Class Codes: A61M 2005/2407 from the rear
• CPC Class Codes: A61M 2005/2411 from the front
• CPC Class Codes: A61M 2005/2437 by clamping means
• CPC Class Codes: A61M 2005/2444 by thread
• CPC Class Codes: A61M 2005/2496 via pivot
• CPC Class Codes: A61M 5/24 Ampoule syringes, i.e. syringes with needle for use in combination with replaceable ampoules or carpules, e.g. automatic ampoules or carpules A61J1/06
• CPC Class Codes: A61M 5/31511 Piston or piston-rod constructions, e.g. connection of piston with piston-rod A61M5/5066 takes precedence

Claims

2. A HOLDER COMPRISING A BARREL ADAPTED TO RECEIVE A CARTRIDGE WITH A PISTON THEREIN, SAID PISTON HAVING A COUPLING BUTTON HAVING A HEAD WITH AN UNDERFACE OF THE HEAD PERPENDICULAR TO THE LENGTH OF THE PISTON, A HUB, FORMING PART OF THE HOLDER, PROVIDED WITH A BORE THERETHROUGH, A PLUNGER SNUGLY SLIDABLY RECIPROCATIVE IN SAID BORE, SAID PLUNGER COMPRISING A FURCATED PORTION FORMING A PLUNGER PORTION SLIDABLE IN THE BORE, AND SAID FURCATED PORTION TERMINATING IN FINGERS DIRECTED TOWARD EACH OTHER ADAPTED TO ENGAGE BENEATH THE HEAD OF THE BUTTON ON THE PISTON, WHEN THE FINGERS ARE BROUGHT TOGETHER, THE FACE OF THE FINGERS ADAPTED TO DIRECTLY ENGAGE THE UNDERFACE OF THE HEAD BEING BEVELLED TO PERMIT EASY DISENGAGEMENT OF THE PLUNGER FROM THE PISTON IN A PREDETERMINED REGION OF THE PLUNGER WITH RESPECT TO THE BARREL.