Apparatus for the detachable connection of a piston with a piston plunger

• US 4,144,885 A
• Filed: 08/01/1977
• Issued: 03/20/1979
• Est. Priority Date: 08/31/1976
• Status: Expired due to Term

• Current Assignee: Oerlikon Contraves AG
• Original Assignee: Contraves AG
• Inventors: Stait, Donald P.
• Primary Examiner(s): Yasko, John D.
• Application Number:
  US05/820,925
• Time in Patent Office: 596 Days
• Field of Search: 128/218 P, 128/218 PA, 128/218 R, 128/234, 128/215
• US Class Current: 604/218
• CPC Class Codes: A61M 5/31511 Piston or piston-rod constructions, e.g. connection of piston with piston-rod A61M5/5066 takes precedence
• CPC Class Codes: A61M 5/31515 Connection of piston with piston rod

Abstract

An apparatus for the detachable connection of an axially to-and-fro movable piston of a syringe with a piston rod or plunger, comprising at least two holder brackets arranged in mutually spaced relationship from one another at the piston plunger and formed of a spring wire, detachably secured with said piston plunger. Each holder bracket essentially comprises two respective axially extending webs and a connection element or piece arranged transversely with respect to said webs. The piston of the syringe possesses a headpiece formed as a substantially truncated cone and equipped with a contact edge engaged by said connection pieces.

Claims

1. An apparatus for the detachable connection of an axial to-and-fro movable piston of a syringe with a piston plunger, comprising:

at least two holder brackets arranged in spaced relationship from one another and detachably secured with the piston plunger;

each of said holder brackets being formed of a spring wire;

each of said holder brackets comprising two respective essentially axially extending webs and a connection element arranged transversely with respect to said webs;

a headpiece constructed in the form of a substantially truncated conical member provided for the piston of the syringe; and

said headpiece having a contact edge with which engage said connection elements.

2. The apparatus as defined in claim 1, further including:

a clamping element for securing the holder brackets with an end face of the piston plunger.

3. The apparatus as defined in claim 1, wherein:

a respective bent-off portion is provided at the webs of the holder brackets and merging therewith end portions extending substantially parallel to said webs.

4. The apparatus as defined in claim 2, wherein:

said clamping element has a rear face provided with two spaced bores for the reception of the end portions and grooves for the reception of the bent-off portions of the holder bracket.