Glass tube and thermoplastic resin finger-grip and nose sleeve syringe body assembly

• US 3,987,940 A
• Filed: 03/18/1974
• Issued: 10/26/1976
• Est. Priority Date: 11/11/1971
• Status: Expired due to Term

• Current Assignee: MPL Ltd.
• Original Assignee: MPL Ltd.
• Inventors: Tischlinger, Edward A.
• Primary Examiner(s): Reeves, Robert B.
• Assistant Examiner(s): Handren, Frederick R.
• Application Number:
  US05/451,925
• Time in Patent Office: 953 Days
• Field of Search: 222/386, 222/386.5, 222/41, 222/44, 128/218 P, 128/218 R, 128/218 PA, 128/218 N, 128/218 NV, 128/218 M, 128/218 G, 128/218 S, 128/218 C, 128/218 D, 128/218 DA
• US Class Current: 222/386
• CPC Class Codes: A61M 2005/3132 having flow passages for injection agents at the distal end of the barrel to bypass a sealing stopper after its displacement to this end due to internal pressure increase
• CPC Class Codes: A61M 2005/3139 Finger grips not integrally formed with the syringe barrel, e.g. using adapter with finger grips
• CPC Class Codes: A61M 5/3129 Syringe barrels A61M5/3205 and A61M5/50 take precedence

Abstract

A glass tube and thermoplastic resin finger-grip and nose-forming sleeve syringe body assembly in which, the finger-grip sleeve and the nose-forming sleeve are each cam-stretched onto and frictionally retained on respective opposite ends of a glass tube, which is a section of die-formed glass tubing. Increase in latitude of operable interference fit and stretch is effected by assembling the finger-grip and nose-forming sleeves onto the glass tube while the sleeves are in a heated condition.

Claims

1. A glass tube and non-glass finger-grip and nose-forming arrangement for use particularly in packaging and subsequent dispensing of chemicals, comprising:

a substantially cylindrical glass tube formed of a length of substantially constant diameter thin-walled glass tubing of substantially constant wall thickness along its length and having a wall thickness substantially smaller than the outer and inner wall diameters of said glass tubing,

a finger-grip sleeve of thermoplastic resin and having a tube-gripping sheath section with laterally extending finger-grip protrusions integrally formed thereon,

and a nose-forming sleeve of thermoplastic resin and having a reduced diameter section integral with a tube-gripping sheath section thereof,

said sleeves being frictionally secured in annularly extending stretch-fit along their sheath sections over and along respectively opposite ends of said glass tube,

a sloped annular cam surface formed on one of the longitudinally inner end of said sheath section of said finger-grip sleeve and the respective longitudinally outer said end of said glass tube,

and a sloped annular cam surface formed on one of the longitudinally inner end of said sheath section of said nose-forming sleeve and the respective said end of said glass tube,

at least one of said slope annular cam surfaces being formed on said one end of said glass tube,

at least one of said sloped annular cam surfaces being smoothly arcuate in longitudinal section,

at least one of said sloped annular can surfaces being formed by and as a part of an annular fire-polished rim formed on one end of said glass tube,

said annular fire-polished rim comprising a fire-polished raised annular bead, and said fire-polished bead being formed at both longitudinal ends of said glass tube,

both of said sleeves sheaths having a laterally outwardly extending annular enlargement section at and in substantial lateral encompassing relation with the respective annular fire-polished end bead on said glass tube,

said finger-grip sheath annular enlargement being a fillet connecting with an annular finger-grip section, and

said annular enlargement on said nose forming sleeve forming a raised ring disposed in spaced relation from the opposite longitudinal ends of its respective said sheath section.

2. A glass tube and non-glass finger-grip and nose-forming arrangement for use particularly in packaging and subsequent dispensing of chemicals, comprising:

a substantially cylindrical glass tube formed of a length of substantially constant diameter thin-walled glass tubing of substantially constant wall thickness along its length and having a wall thickness substantially smaller than the outer and inner wall diameters of said glass tubing,

a finger-grip sleeve of thermoplastic resin and having a tube-gripping sheath section with laterally extending finger-grip protrusions integrally formed thereon,

and a nose-forming sleeve of thermoplastic resin and having a reduced diameter section integral with a tube-gripping sheath section thereof,

said sleeves being frictionally secured in annularly extending stretch-fit along their sheath sections over and along respectively opposite ends of said glass tube,

a sloped annular can surface formed on one of the longitudinally inner end of said sheath section of said finger-grip sleeve and the respective longitudinally outer said end of said glass tube,

and a sloped annular cam surface formed on one of the longitudinally inner end of said sheath section of said nose-forming sleeve and the respective said end of said glass tube,

at least one of said sloped annular cam surfaces being formed on said one end of said glass tube,

at least one of said sloped annular cam surfaces being smoothly arcuate in longitudinal section,

at least one of said sloped annular can surfaces being formed by and as part of an annular fire-polished rim formed on one end of said glass tube,

said annular fire-polished rim comprising a fire-polished raised annular bead, and said fire-polished bead being formed at both longitudinal ends of said glass tube, and

said nose-forming sleeve having a raised annular engagement ring section at and in substantial encompassing relation with said one annular fire-polished and bead on said glass tube, said ring being disposed in spaced relation from the opposite longitudinal ends of the sheath section of said nose-forming sleeve.