Patent Number: 6,170,372

Title: Dual spring hold down for wood working tools

Abstract: A dual spring hold down for use with wood working tools, such as table saws, routers and shapers comprises a bracket mounted on the wood working table behind the tool and a hold down bar pivotably attached to the bracket with the hold down bar surrounding the wood working tool. A threaded rod is threaded into and extends upward from an extension arm of the bracket and though a slot in a hold down bar cross plate. A first coil spring surrounds the threaded rod immediately above the cross plate and a second, stronger coil spring surrounds the threaded rod above the first coil spring while a cylindrical sleeve surrounds the first coil spring. The hold down bar is free to drop down to act as a safety barrier when no wood panel is present. Then, initial lifting of the hold down bar by a wood panel is initially against the relatively light downward bias of the first coil spring until the sleeve is lifted to a "hold down height" at a point sufficient to compress the first coil spring within the sleeve. Further lifting of the hold down bar is then against the considerably stronger downward bias of the second coil spring which provides the hold down bias. The hold down height of the hold down bar is adjustable by threading the threaded rod upward or downward.

Inventors: Weaver; Richard A. (Overland Park, KS)


International Classification: B23Q 3/00 (20060101); B23D 47/04 (20060101); B23D 47/00 (20060101); B27C 5/06 (20060101); B27C 5/00 (20060101); B27B 025/06 (); B27B 027/00 ()

Expiration Date: 01/09/2018