Abstract: Disclosed is a cambering apparatus for imparting a predetermined camber to a leaf spring blank loaded between a pair of dies opposing vertically to each other by bringing the dies closer relative to each other; the apparatus comprising an upper variable die and a lower variable die; the upper variable die essentially consisting of a multiplicity of upper supporting members disposed on upper guide members to be slidable in the longitudinal direction thereof; and a multiplicity of upper shaping fingers fitted descendably in U-shaped grooves defined on the upper supporting members, respectively; whereas the lower variable die consisting essentially of a multiplicity of lower supporting members disposed on lower guide members to be slidable in the longitudinal direction thereof; and a multiplicity of lower shaping fingers fitted ascendably in U-shaped grooves defined in the lower supporting members, respectively; wherein the shaping fingers are ascended or descended to be positioned onto the supporting members re

Abstract: Disclosed is a constraining apparatus, for constraining cambered leaf spring blanks when they are quenched in an quenching oil in the oil tank of a quenching systems so as to prevent any possible distortion in the directions of the thickness and width of the blanks. The constraining apparatus basically consists of a drive system having a pair of sprockets, a drive shaft for driving the sprockets, a fixed disc and a pair of endless chains extended across the sprockets and the fixed disc, with a plurality of constrainers attached across these chains.

Abstract: Disclosed is a cambering apparatus for imparting a predetermined camber to a leaf blank for a laminated spring, which requires no change-over of molds in accordance with order changes, whereby to reduce the change-over time greatly to improve productivity.

Abstract: Disclosed is a method and an apparatus for cambering a leaf spring by pressing a heated leaf spring element or member between a pair of molds, characterized in that the pair of molds each comprises a plurality of mold fingers which can be advanced or retracted relative to the opposite mold by operating a plurality of drive means connected to the plurality of mold fingers based upon a predetermined command transmitted from a control means so as to advance or retract the fingers to required heights, respectively, so that the free ends of the mold fingers as a whole may form a required mold surface; and each mold finger is locked by a releasable locking means. The cambering apparatus may further comprise a tempering section, in which the pair of molds, together with the cambered leaf spring, are designed to be immersed within the tempering liquid contained within a liquid tank so as to effect tempering of the cambered leaf spring.

Abstract: A forming device in a coil spring forming machine for forming a coil spring by winding a heated rod or wire-shaped spring material into a form of a spiral, wherein the forming machine includes an independent cassette mechanism which may be removably mounted to a predetermined site on the body of the forming machine and the independent cassette mechanism is composed of a mandrel around which the rod or wire-shaped spring material is to be wound into a form of a spiral and a guide means for guiding the spring material in a direction along which the spring material may be wound around the mandrel at a required lead angle into a form of a spiral.

Abstract: Disclosed is a method and device for making a double-coned coil spring, which comprises using a semi-finished spring having formed upon one end thereof a first conically wound portion with the rest of the wound portion extending axially with a constant maximum diameter, and forming a second conically wound portion upon the free end of the cylindrically wound portion; wherein the cylindrically wound portion is clamped at the site from which formation of the second conically wound portion is to be started by means of a first clamping means, and the open end of the cylindrically wound portion is also clamped by means of a second clamping means; and the second clamping means is allowed to rotate in the direction of winding the semi-finished spring, while the second clamping means is forced to be moved radially inwardly toward the center of the semi-finished spring.

Abstract: Disclosed herein is an improved method and apparatus for making a coil spring wherein a wire material is fed on a line of feed which is maintained at a constant position relative to a mandrel adapted for winding the wire material. The mandrel is controlled to pivot into a predetermined angular winding position relative to the line of feed and to move in the axial direction thereof so as to form the wire material into a spring.

Abstract: Disclosed herein is a method and apparatus for producing a barrel-shaped coil spring, by forming a coil spring having a first pig tail at one end, with a second pig tail at the other end. The method comprises providing a winding jig having a spiral stepped portion suited for forming a desired second pit tail; inserting the winding jig into the other end of the coil spring; and providing a rotary spindle for modifying the other end of the coil spring axially and radially relative to the winding jig, thereby winding the other end of the coil spring around the winding jig to form the desired second pig tail. Apparatus for performing the method is disclosed which comprises a winding jig and a cooperative rotary spindle to provide the second pig tail on the coil spring.

Abstract: A method for automatically forming wire frames which consists of the ordered steps of straightening continuously supplied wire stock, cutting the straightened wire stock into prescribed lengths, forming small ripples in portions of each section of the cut wire stock, ejecting and conveying the cut wire stock sections in a lateral direction, pooling the wire stock sections in successive order in a lateral direction, gathering together, removing and conveying a prescribed number of the pooled wire stock sections at given intervals, simultaneously bending a prescribed number of wire stock sections in the same plane as the ripples, removing and conveying the bent stock sections, pooling the conveyed wire stock sections in successive order in a lateral direction, separating the pooled wire stock sections into single sections spaced at equal intervals, intermittently feeding the separated wire stock sections into a press, pressing a three-dimensional bend into the fed wire stock sections and simultaneously ejecting