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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
First Claim
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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, andsaid 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.

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