| 摘要 |
A coilable member, such as a measuring tape, is replaceably supported within a device for extension and recoiling. A separable casing defines an aperture through which a coilable member can be extracted and retracted, and has an interior portion defining a bearing surface for supporting for rotation a first reel adapted to retain a spring secured to the reel. The first reel rotatably supports a second reel adapted to support the coilable member secured thereto and extending through the aperture defined by the casing. The second reel is supported in the casing by the first reel for relative axial movement with respect to the first reel. Braking means, which can include an annular member having teeth which engage at least one of the reels, rotates therewith in the casing substantially freely in one direction, while causing retardation of the rotation of the reel in the opposite direction through frictional engagement with the side of the casing. The device can further include a rotatable member accessible for rotation through an aperture in the casing for tensioning a spring retained by the first reel.
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