Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator
Patent
1986-09-15
1987-07-28
Echols, Percy W.
Metal working
Means to assemble or disassemble
Puller or pusher means, contained force multiplying operator
72138, 72139, B21F 3502
Patent
active
046823948
ABSTRACT:
A bedding foundation box spring having novel double twist coil springs interconnecting a wooden base frame and a top wire grid. The coil springs each comprise a single length of wire having a middle section located in a diametral plane of one end convolution of the spring and a pair of spring arms coiled in the same rotational direction from opposite ends of the middle section. Each of the spring arms is formed into a helix of varying pitch which terminates in a free end of the spring arm. The free ends of the two spring arms of each coil are located on opposite sides of the end convolution of the coil and are secured to the wire grid. The novel coils are manufactured by inserting a straight length of wire through a stationary pair of forming dies and a mandrel located between the dies. With the middle of the straight length of wire located in the mandrel, the mandrel is then simultaneously rotated and moved axially while the ends of the length of wire are pulled through the stationary forming dies.
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Serafini Angelo
Wells Thomas J.
Echols Percy W.
Leggett & Platt Incorporated
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