Sewing needle with two portion shank

  • US 4,519,330 A
  • Filed: 12/28/1983
  • Issued: 05/28/1985
  • Est. Priority Date: 12/28/1983
  • Status: Expired due to Term
First Claim
Patent Images

1. A needle for use with a sewing machine having a one way needle clamp of the type having a needle shank accommodating recess with a mouth shaped to admit a given irregular shaped needle shank in only one orientation, and means within said recess for locating a reference surface on said needle shank in a predetermined plane with respect to said sewing machine, said needle having a blade extending parallel to the lengthwise axis of said needle, an enlarged shank including a minor portion adjacent the free extremity thereof and a major portion extending from the blade and formed with a flat planar reference surface for cooperation with said locating means in said needle clamp, only said minor portion being formed with with said given irregular shape for cooperation with said needle clamp mouth to admit said needle into said needle clamp recess in only one orientation, in which said flat planar reference surface along said major portion of said shank extends into said given irregular shape in said minor portion at the free extremity of said shank, and said given irregular shape further includes protrusions formed at each side of said flat, said protrusions substantially extending the width of said flat in said minor portion as compared with the width of said flat along said major shank portion.

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