Abstract: A work performing member in the nature of a tool or die component comprised of multiple axially related parts including one element which has a work performing end and a shank end and a second element capping the shank end and forming an extension thereof as well as forming thereon a head. The shank end of the one element and the head provided by the other are so formed to effectively and simply key together in an unmistakable fashion whereby to prevent rotation of one relative the other and means are provided for interconnection of the head element to the shank end of the other element in a manner to achieve a pressured connection thereof. Said head element, in a preferred embodiment is further characterized by a form emphasizing the pressured and precisely related disposition of the elements in the connection thereof by the positioning thereof through the medium of alignment pins utilizing means and methods such as described in the U.S. Letters Pat. No. 3,797,352.

Abstract: A die system wherein upper and lower die shoes have a basic generally standardized form and are adapted for an interchangeable mount of various sub-assemblies embodying different die tools. The system features means facilitating a precise and quick location of a sub-assembly on its related die shoe as well as a quick release thereof. The invention further provides a unique pressure cell for backing the material being worked in a manner to insure optimal performance of the die and a quality work product.

Abstract: A spring unit comprising spring means, a cage for the spring means, and means to control the path of movement of the spring means within the cage having in association therewith means to apply a required pre-load on the spring means within the cage.In preferred embodiments of the caged spring assemblies, the open spaces between the coils of a contained spring are reduced to a dimension less than that of the thickness of the coils themselves. This prevents the coils from winding or screwing and from materially affecting the prescribed pre-load in event of spring breakage.