| 摘要 |
A continuously unfurlable car window shade includes a shaft having a first end coupled with a ratchet wheel formed with a control button, and a second end coupled with a knob. A window shade is attached to the shaft and rolled therearound. A spring having a first end coupled with the shaft, and a second end coupled with a rod, winds along the rod. A shell encases the shaft. An end cap having a rectangular well holds the rod. A control cap having a pawl that can be used to engage with the ratchet wheel holds the shaft. While a user pulls down the window, the ratchet wheel slides on the pawl. The rotational shaft then rotates, thus loading the spring, and unfurls the window shade. After unfurling the window shade to a desired length, the user releases the window shade. The tension pulls the knob, thus forcing the ratchet wheel to engage with the pawl, thus locking the window shade unfurled to the desired length. When wishing to furl the window shade the user just pushes the control button. The ratchet wheel thus disengages from the pawl thus allowing the torsion stored in the spring to roll back the window shade.
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