Did You Know...
...that the Slinky toy was the result of a failed attempt by engineer Richard James to produce an antivibration device for ship instruments? His goal was to develop a spring that would instantaneously counterbalance the wave motion that rocks a ship at sea. Instead, he developed the Slinky.
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| Number | Title | Issue Date |
| 6401772 | System and method for forming dovetail joints An apparatus for cutting dovetail joints comprises one or more trapezoidal mortising chisels mountable on a drill press, each trapezoidal mortising chisel having a trapezoidal cross sectional shape with a particular slope or "pitch" on its non-parallel si... | 06/11/2002 |
| 4847961 | Method and apparatus for stitch-machining deep cavities in metal workpieces Stitch-machining the walls of a cylindrical blind cavity of a workpiece, the cavity being deep and narrow with respect to the axis of the cavity, is carried out by: (a) supporting a tubular housing for axial movement throughout substantially the axial ext... | 07/18/1989 |
| 4661028 | Reverse cutting expansion tap An expansion tap having a body (20) with a head (22) on one end and angularly tapered threads (26) on the other, with a bore (24) running therethrough. The body (20) has a shoulder stop (38) in the middle and a plurality of flutes (28) through the threade... | 04/28/1987 |
