Patent Model - Screw-Driver

Maker and role
Cal Thomas (b.1837, d.Post 1884), Patentee
Production date
May 23 1882
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Object detail

Wood, iron, brass
8 x 1 1/2" (20.3 x 3.8cm)
Thomas' patent "relates to improvements in screw-drivers in which clamping-jaws are used for holding the screw in contact with the driver when entering it into the material into which it is to be driven; and the objects of my improvements are to provide certain novel devices and combinations thereof, which, when properly arranged, shall constitute a screw-driver, which, when a screw is properly placed in it, will hold it in position for being entered into the substance into which it is to be driven..." (Patent Number 258,329)
Object number
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