Winding – tensioning – or guiding – Strand tensioning device – Tortuous course
Patent
1990-04-30
1991-12-31
Stodola, Daniel P.
Winding, tensioning, or guiding
Strand tensioning device
Tortuous course
242 719, B65H 4906
Patent
active
050765108
ABSTRACT:
A thread bobbin especially useful for tying artificial flies and the like. The bobbin has a rotatable spool mounted on an arbor. The arbor also supports a yoke that holds a thread delivery tube. An annular space is defined between the arbor and an inner surface of the spool. A coiled flat spring is contained within the annular space. The spring is free in the sense that neither end is fixed to any other structural portion except by friction. In the resting or neutral position one end of the spring engages the inner surface of the spool and the other surface of the arbor. When thread is withdrawn the spring grips both the spool and arbor and the spring is tensioned. After more than a predetermined length of thread has been removed the spring slips clutch-like against the inner surface of the drum to prevent overtensioning. When tension is removed from the withdrawn thread an amount of thread up to the predetermined length is automatically rewound. When rotated in the rewind direction from the resting position, the spring is allowed to slip against the arbor. This allows any excess thread to be rewound onto the spool by hand and prevents the spring from doubling back on itself.
REFERENCES:
patent: 460723 (1891-10-01), Eisenhart
patent: 1838874 (1931-12-01), Serres
patent: 2220878 (1940-11-01), Harvey
patent: 2338353 (1944-01-01), Perkins
patent: 4096010 (1978-06-01), Parham et al.
patent: 4189111 (1980-02-01), Doiron
patent: 4253620 (1981-03-01), Takei et al.
patent: 4462551 (1984-07-01), Bloch
Gehr Keith D.
Nguyen John Q.
Stodola Daniel P.
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