Syringes for dispensing paste or the like

• US 3,212,685 A
• Filed: 10/26/1961
• Issued: 10/19/1965
• Est. Priority Date: 11/02/1960
• Status: Expired due to Term

• Current Assignee: James Swan Richard, Julius P. Steindler
• Original Assignee: James Swan Richard, Julius P. Steindler
• Inventors: JAMES SWAN RICHARD, Steindler, Julius P.
• Application Number:
  US04/147,868
• Time in Patent Office: 1,454 Days
• US Class Current: 222/386
• CPC Class Codes: A61M 2005/31516 reducing dead-space in the syringe barrel after delivery
• CPC Class Codes: A61M 3/00 Medical syringes, e.g. enemata; Irrigators A61M5/00 takes precedence; pistons A61M5/315
• CPC Class Codes: A61M 5/31586 performed by rotationally moving or pivoted actuator, e.g. an injection lever or handle
• CPC Class Codes: B05C 17/0133 Nut and bolt advancing mechanism, e.g. threaded piston rods
• CPC Class Codes: B24B 57/00 Devices for feeding, applying, grading or recovering grinding, polishing or lapping agents for abrasive blasting B24C1/00, B24C7/00
• CPC Class Codes: B65D 83/0011 moved by a screw-shaft
• CPC Class Codes: F16N 3/12 Grease guns
• CPC Class Codes: G01F 11/027 of the syringe type

Claims

1. A SYRINGE FOR DISPENSING A PASTY SUBSTANCE, COMPRISING:

A CYLINDRICAL BARREL HAVING A REAR END WALL FORMED WITH A CENTRAL GUIDE OPENING;

A NOZZLE SECURED ON THE FRONT END OF THE BARREL AND HAVING A PART-SPHERICAL, CONCAVE INNER END SURFACE FROM WHICH EXTENDS A NARROW EXIT PASSAGE FOR THE PASTY SUBSTANCE, OF WHICH AT LEAST THE INNER END LIES ON THE AXIS OF THE BARREL;

A PISTON ARRANGED FOR SLIDING AXIAL MOVEMENT IN THE BARREL, SAID PISTON BEING COMPOSED OF A RESILIENT YIELDING MATERIAL AND HAVE A PART-SPERICAL CONVEX CROWN END SURFACE OF LARGER RADIUS THAN THE INNER END SURFACE OF NOZZLE AND ADAPTED TO COOPERATE THEREWITH AT THE END OF THE DELIVERY STROKE OF THE PISTON;

A PLUNGER CONNECTED AT ONE END TO SAID PISTON EXTENDING OUTWARDLY THROUGH THE CENTRAL GUIDE OPENING IN THE REAR END WALL AND HAVING A HANDLE ON ITS EXTERNALLY PROJECTING REAR END, SAID PLUNGER BEING AXIALLY SLIDABLE THROUGH BUT NOT ROTATABLE IN SAID CENTRAL GUIDE OPENING;

AND A FINGER NUT SCREWED ON THE PLUNGER AND MOUNTED ON THE REAR END OF THE BARREL SO THAT IT IS ROTATABLE THEREON BUT CONSTRAINED AGAIST AXIAL DISPLACEMENT WITH RESPECT THERETO.