US 5,215,021 AGranted

Needle with triangular end and thermal load reducing eye

AssigneeSinger Spezialnadelfabrik GmbH

InventorWolf-Dieter Fuhrmann

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Abstract

A sewing machine needle has a piston for clamping the needle into a sewing machine, a needle shaft comprised of a shaft portion and an end piece with a tip, whereby the needle shaft has a needle eye between the shaft portion and the end piece for receiving a sewing thread. A conical portion connected to the piston forms a transition into the needle shaft. The end piece, between the tip and the needle eye, has a triangular radial cross-section with rounded corners, whereby the size of the triangular cross-section increases from the tip toward the needle eye, and whereby the triangular cross-section has its greatest size in the vicinity of the needle eye. The needle shaft, in the area of the needle eye, has an essentially circular cross-section, and this circular cross-section has a size that is smaller than the greatest size of the triangular cross-section.

Claims2

Dependent claims

A sewing machine needle comprising:

a piston for inserting said needle into the sewing machine;
a needle shaft comprised of a shaft portion and an end piece with a tip, said needle shaft having a needle eye between said shaft portion and said end piece for receiving a sewing thread;
a conical portion connected to said piston and forming a transition between said piston and said needle shaft;
said end piece, between said tip and said needle eye, having a radial cross-section of a triangular shape with rounded corners, with a size of said radial cross-section of triangular shape increasing from said tip toward said needle eye, said radial cross-section of triangular shape having a greatest size in the vicinity of said needle eye;
and
said needle shaft, in the area of said needle eye, having an essentially circular cross-section, wherein said circular cross-section is smaller than said greatest size of said radial cross-section of triangular shape of reducing a thermal load on the sewing thread.

3 more elements

Dependencies are inferred from the claim text.