Single Free-end Wire Reel - Patent 8136751  Document Sample
scope of work template Description: 1. Field of the Invention
The present invention relates to a single free-end wire reel,
and more particularly to a device to extend and retract a wire.
2. Description of the Prior Art A wire earphone or a mouse uses
a transmission wire to get or transmit data. A key ring,
stationery or a decoration also uses a wire for retraction or
extension. In the past, the wire is wound or collected
irregularly. Sometimes, the wire isto wind around, which is not
convenient when in use. Therefore, there are some improved
products on the market for extending and retracting a wire. This
type of product comprises a spiral spring to extend/retract the
wire through the spiral route ofthe spiral spring. When the wire
is pulled out in use, the operation to pull out the wire is
slightly held up by the outward force of the spiral spring.
However, the force of the spiral spring can be overcome easily,
so the wire is retracted along atrack