Measuring and testing – Volumetric content measuring
Patent
1977-11-10
1979-02-13
Reynolds, Wm. Carter
Measuring and testing
Volumetric content measuring
73143, 112 1, G01L 512
Patent
active
041388852
ABSTRACT:
A gage for setting sewing machine bobbin tension is comprised of a tensioning member which is located substantially within an open topped cylindrical case and which has gripping means arranged to extend out of the case, through an elongate opening in its side, for releasably engaging thread from a sewing machine bobbin. The tensioning member includes a tightly wound coil which fits rotatably over a post located in the case, but which is prevented from rotating on the post by means of a tab extending from one of its ends. The other end of the coil extends across the case to provide a straight indicating section, and an extention section extends at an acute angle from the indicating section back across and out of the case through the opening. A window located in a lid which covers the open top of the case is arranged to display a portion of the indicating section. When the bobbin is pulled relative to the case the tensioning member is pulled further out of the case, however, the amount of its displacement is limited and is proportional to the pulling force on it due to the spring effect of the coil, which is rotatably limited. Therefore the relative position of the indicating section in the window is indicative of the bobbin tension.
REFERENCES:
patent: 136626 (1873-03-01), Tiffany
patent: 1084736 (1914-01-01), Hagelstein
patent: 1305780 (1919-06-01), Dilks
patent: 2457245 (1948-12-01), Larson et al.
patent: 2625819 (1953-01-01), Miller
patent: 2694926 (1954-11-01), Hansen et al.
patent: 2987913 (1961-06-01), Whitehead, Jr.
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