Stock material or miscellaneous articles – All metal or with adjacent metals – Helical or with helical component
Reexamination Certificate
2001-10-16
2003-08-19
Zimmerman, John J. (Department: 1775)
Stock material or miscellaneous articles
All metal or with adjacent metals
Helical or with helical component
C428S573000, C428S583000, C428S584000, C428S594000, C148S527000, C072S127000, C072S129000, C072S146000, C072S371000
Reexamination Certificate
active
06607841
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an improved silicon steel sheet and particularly a silicon steel sheet with a changed soldering structure to facilitate production of silicon steel cores to reduce costs and increase production yield.
BACKGROUND OF THE INVENTION
Most presently known current limiters or choke coils have a silicon steel core formed in an annular shape (as shown in FIGS.
1
A and
1
B). Th silicon steel core is made of an elongated silicon steel sheet cut to a selected length from a silicon sheet
10
. The formed silicon steel sheet has two lateral ends
10
a
and
10
b
. Then anchor one lateral end
10
b
to wind the silicon steel sheet in an annular shape by means of a tool to form the silicon steel core desired, and solder another lateral end
10
a
at a solder spot
10
c
. The silicon steel core thus made usually has two corners
10
d
at the lateral end
10
a
that are prone to turn upwards. The turned corners tend to hamper installation of the silicon steel core into the casing and make assembly more difficult. Moreover, the corners
10
d
tend to become very sharp after being cut. Workers who do assembly or installation of the silicon steel cores in the casings could easily get hurt or injured. While fully soldering the lateral end
10
a
and corners
10
d
can eliminate the turning up problem of the corners
10
d
, it causes additional problems in soldering operation and results in higher costs.
There are many techniques disclosed in the prior art to address the product winding processes. References can be found in U.S. Pat. Nos. 5,813,616, 2,094,454, 2,191,028, 2,776,094, 3,583,558 and 4,445,646. They generally propose to cut the end of the winding articles to a triangular shape to facilitate winding operations. Those techniques mostly aim to winding soft materials such as photo films, plastic rolls, paper, etc. The technique for winding stiff material such as silicon steel sheet is still unknown.
SUMMARY OF THE INVENTION
The primary object of the invention is to resolve aforesaid disadvantages. The invention provides a novel silicon soldering structure to allow the cut lateral ends fastening to the silicon steel sheet securely.
Another object of the invention is to provide an annular silicon steel core structure that is easier to make to reduce costs and increase production yield.
A further object of the invention is to protect workers from injury during producing and assembling the silicon steel cores.
To achieve the foregoing objects, the silicon steel sheet of the invention has two lateral ends after being punched. Each lateral end has a side edge which is narrower than the original width of the silicon steel sheet. Between the side edge and the lateral sides of the silicon steel sheet, two slant solder zones are formed for soldering use at the initial winding stage and the final winding stage.
The foregoing, as well as additional objects, features and advantages of the invention will be more readily apparent from the following detailed description, which proceeds with reference to the accompanying drawings.
REFERENCES:
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patent: 2191028 (1940-02-01), Miller et al.
patent: 2776094 (1957-01-01), Edwards et al.
patent: 3698223 (1972-10-01), Sagara
patent: 4170691 (1979-10-01), Rogers
patent: 4445646 (1984-05-01), Karr et al.
patent: 4662954 (1987-05-01), Fedoris
patent: 5026439 (1991-06-01), Tanaka et al.
patent: 5319833 (1994-06-01), Kohl et al.
patent: 5553640 (1996-09-01), Ferenczy et al.
patent: 5566443 (1996-10-01), Allan et al.
patent: 6039283 (2000-03-01), Munoz-Baca et al.
patent: 6498554 (2002-12-01), Chow
Savage Jason L
Zimmerman John J.
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