Coil and coil-head formation dies coils with non-conventional terminal convolutions

Abstract

Machinery for automated manufacture of innerspring assemblies (1) for mattresses and flexible support structures includes coil formation devices (201, 202) configured to produce generally helical spring coils (2) having a terminal convolution (26) which extends beyond an end of the coil and a conveyor system (301, 302) having a plurality of flights (308) connected to a chain (315) and driven by an index driver (320) which delivers formed coils to an innerspring assembler (500). A coil forming block (208) on a coiler machine has a cavity (218) in which a terminal convolution of the coil is formed, and from which the coil is cut by a cutter (212) which extends into the cavity. Coil head formation dies (2000) at coil head forming stations (230, 240) of the coil forming machine also have a cavity (2010) for receiving a terminal convolution of a coil, and flanges (2007, 2008) which surround the cavity and provide a punch set for punches (232) which form a coil head proximate to the terminal convolution in the die.

Description

technical field [0001] The present invention relates generally to formed wire structures and, more particularly, to machinery for the automated fabrication and assembly of wire-shaped structures such as coils and springs and inner spring assemblies having a set of interconnected wire springs or coils . Background technique [0002] Internal spring assemblies for mattresses, furniture, seats, and other resilient structures are assembled by first arranging the coils or springs by hand in a matrix and interconnecting them with tie or connecting wires. Depending on the design of the inner spring, the coils are connected at various points along the axial length. The machines that automatically form the coils cooperate with various conveying means to transport the coils to the assembly point. For example, US Patent Nos. 3,386,561 and 4,413,659 describe apparatus for transferring springs from an automatic spring forming machine to a spring core assembly machine. Spring or coil f...

AI Technical Summary

Problems solved by technology

This machine is not suitable for coils of different designs, especially for coils where the terminal turns extend beyond the bottom or end of the coil

Additionally, these types of machines are prone to misoperation due to the need for two sets of clamping jaws with multiple fast moving small parts and linkages for the top and bottom of each coil

Images