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| Number | Title | Issue Date |
| 8007606 | Salvage process for spring elements An improved method for salvaging a spring element with a degraded force constant for return to a work environment. The spring element is subjected to a high temperature and extended duration annealing treatment alone or in combination with other treatments. The resu... | 08/30/2011 |
| 7459037 | Method of manufacturing reactor member by using the surface treatment method A method of surface-treating a reactor member for effectively removing a Cr-deficient layer and a work-hardened layer considered to be a cause of stress corrosion cracking (SCC) under low-stress conditions. The method of surface-treating a reactor member which is wo... | 12/02/2008 |
| 7407555 | Oil tempered wire for cold forming coil springs An oil-tempered wire for a cold-formed coil spring having a quality equivalent of or higher than a hot-formed coil spring is provided. A cold-formed coil spring made from the oil-tempered wire is also provided. Material used is the steel which contains, in weight pe... | 08/05/2008 |
| 7404865 | Steel wire for heat-resistant spring, heat-resistant spring and method for producing heat-resistant spring A high-strength steel wire for heat-resistant springs has both excellent high-temperature tensile strength and excellent high-temperature sag resistance at a temperature as high as 350 to 500° C., particularly at 400° C. or so (these properties are needed for spri... | 07/29/2008 |
| 7294212 | High-strength stainless steel material in the form of a wheel rim and method for manufacturing the same Material for stainless steel sheets is heated to a temperature within a range of 850 to 1250° C. and cooled at a rate 1° C./s or faster, the material including 0.02% by mass or less of C, 1.0% by mass or less of Si, 2.0% by mass or less of Mn, 0.04% by mass or les... | 11/13/2007 |
| 7284308 | Method for manufacturing a leaf spring Leaf springs have improved durability in spite of using inexpensive spring steel such as SUP9 and SUP11 as materials. While a spring main body, made of the spring steel in which Brinell hardness is under 555 HBW and not less than 388 HBW (corresponding to a diameter... | 10/23/2007 |
| 7255758 | Steel wire and method of manufacturing the same A steel wire of pearlite structure containing 0.8-1.0 mass % of C and 0.8-1.5 mass % of Si is disclosed. In the cross section of the steel wire the difference in average hardness between a region up to 100 μm from the surface thereof and a deeper region is within 5... | 08/14/2007 |
| 7192015 | Plate spring with improved settlement behavior A plate spring of a substantially circular-ring-shaped form having a substantially externally conical upper side (12) and a substantially internally conical underside (13) between which there are positioned an outer annular edge (14) and an inne... | 03/20/2007 |
| 7146731 | Snapping and hinging arrangements, watches and associated methods A magnet assembly connectable to a metal assembly in an engaging fashion, a metal assembly connectable with the magnet assembly in an engaging fashion and a snapping mechanism comprising the magnet assembly and the metal assembly are disclosed, to be used with a str... | 12/12/2006 |
| 7111833 | Dual disc spring A dual spring includes a pair of conically-shaped spring sections, which are joined at a common fulcrum. One of the spring sections is disposed radially inward from the fulcrum and the other of the spring sections is disposed radially outward from the fulcrum. Both ... | 09/26/2006 |
| 7074282 | Steel wire rod for hard drawn spring, drawn wire rod for hard drawn spring and hard drawn spring, and method for producing hard drawn spring Disclosed is a steel wire rod for hard-drawn springs capable of exhibiting fatigue strength and sag resistance equivalent to or higher than springs made of an oil-tempered wire. The steel wire rod contains carbon in a range from 0.5 to less than 0.7 mass %, silicon ... | 07/11/2006 |
| 7055244 | Method of manufacturing flat wire coil springs to improve fatigue life and avoid blue brittleness The present invention relates to a method of forming a coil of spring wire by winding a wire into a coil spring formed of a plurality of rings of the wire wherein each of the rings has a substantially constant strain rate. The forming speed of the wire being wound i... | 06/06/2006 |
| 7018209 | Apparatus and methods for a shape memory spring actuator and display Various apparatus and methods for an actuator and display using one or more shape memory springs. A shape memory spring is heated and urges a pin to a first or extended position. The pin may be supported in the first position by a supporting mechanism. The shape mem... | 03/28/2006 |
| 6986203 | Manufacturing method for a composite coil spring A manufacturing method for a composite coil spring includes the following steps: preparing a mold, winding a coil former around a mandrel of the mold, winding composite material pre-preg, compressing and heating, opening the mold and detaching the mandrel and the co... | 01/17/2006 |
| 6939418 | Process for the thermomechanical treatment of steel A process for thermomechanical treatment of steel for torsionally-strained spring elements, the initial material being heated with a heating rate of at least 50 K/s and austenitized, and then, being formed in at least one forming step with the formed product being q... | 09/06/2005 |
| 6936792 | Furnace cart and load transfer system for high temperature vacuum furnaces and process therefor Furnace cart assembly for loading high temperature vacuum furnaces for treating target material, for example, metal parts, under extreme temperature and vacuum environments. The furnace cart includes electrical heating elements as an integral part of the cart, which... | 08/30/2005 |
| 6893727 | Metal gasket and a material for its manufacture and a method for their manufacture This invention relates to a stainless steel gasket having markedly improved strength and fatigue properties due to precipitation strengthening. Its composition comprises C: at most 0.03%, Si: at most 1.0%, Mn: at most 2%, Cr: 16.0%-18.0%, Ni: 6.0%-8.0%, N: at most 0... | 05/17/2005 |
| 6793745 | Maraging type spring steel The invention relates to a high-strength, age-hardenable, corrosion-resistant maraging type spring steel, which is essentially comprised of 6.0 to 9.0 wt. % of Ni, 11.0 to 15.0 wt. % of Cr, 0.1 to 0.3 wt. % of Ti, 0.2 to 0.3 wt. % of Be and of a remainder consisting... | 09/21/2004 |
| 6779564 | Method and apparatus for setting a helical compression spring The present invention is directed to method for setting a formed helical compression spring. At the out set, parameters are measured to determine a reaction force axis of a formed helical compression spring. Next, A target reaction force axis of the spring is compar... | 08/24/2004 |
| 6648996 | Method and apparatus for producing a helical spring The present invention is directed to a method for producing a helical spring which comprises the steps of providing a plurality of parameters for defining a desired configuration of a target helical spring, setting at least bending positions and twisting ... | 11/18/2003 |
| 6627005 | High fatigue-strength steel wire and spring, and processes for producing these A steel wire of pearlite structure containing 0.8-1.0 mass % of C and 0.8-1.5 mass % of Si is disclosed. In the cross section of the steel wire the average hardness in a region up to 100 μm from the surface thereof is at least 50 higher that that in a de... | 09/30/2003 |
| 6544360 | Highly strengthened spring and process for producing the same In a production process for highly strengthened springs, the process comprises performing a first shot peening to a spring steel having a hardness of a diameter of 2.7 mm or less on a Brinell ball mark while applying stress to the springs at a warm temper... | 04/08/2003 |
| 6527883 | Steel wire and method of manufacturing the same A steel wire of pearlite structure containing 0.8-1.0 mass % of C and 0.8-1.5 mass % of Si is disclosed. In the cross section of the steel wire the difference in average hardness between a region up to 100 μm from the surface thereof and a deeper region ... | 03/04/2003 |
| 6458226 | Process for the thermomechanical treatment of steel A process for thermomechanical treatment of steel for torsionally-strained spring elements, the initial material being heated with a heating rate of at least 50 K/s and austenitized, and then, being formed in at least one forming step with the formed prod... | 10/01/2002 |
| 6383316 | Cold drawn wire and method for the manufacturing of such wire Through electro slag refining of a bloom of a stainless, precipitation hardenable stainless steel of 17-7 PH type, the fatigue resistance of springs made of cold drawn wires of said material is increased substantially. This depends on the fact that large ... | 05/07/2002 |
| 6372056 | Spring steel superior in workability A spring steel which is superior in both shaving properties and green drawing properties, which are important in spring production. A process for making the spring steel into wire rods for good springs. A rolled spring steel superior in workability charac... | 04/16/2002 |
| 6346157 | Manufacturing method of suspension spring for car A method for manufacturing a coiled spring having a high fatigue strength to be used for example as a suspension spring of a car using a rod of tensile strength 1910 to 2020 N/mm2 and diameter 8 to 17 mm. In a cold coiling step, the rod is form... | 02/12/2002 |
| 6338763 | Steel wire for high-strength springs and method of producing the same This invention provides an oil-tempered wire having high strength (tensile strength of not less than 1960 MPa) and excellent workability and specifically provides a steel wire for high-strength springs comprising as steel components, in weight percent, ... | 01/15/2002 |
| 6235131 | System for heat treating coiled springs Steel springs are cold coiled, then hardened by electrical resistance heating, and then quenched. The invention may be used to produce hardened springs with uniform mechanical and physical characteristics, fine grain microstructures, and high fatigue resi... | 05/22/2001 |
| 6224686 | High-strength valve spring and it's manufacturing method The high-strength valve spring uses, as the material, a steel containing 0.5-0.8% C, 1.2-2.5 wt % Si, 0.4-0.8 wt % Mn, 0.7-1.0 wt % Cr, balance Fe and inevitable impurities, where, in the inevitable impurities, Al is no more than 0.005 wt % and Ti is no m... | 05/01/2001 |
| 6206984 | Non-heat treated wire or bar steel for springs A non-heat treated wire or bar steel for springs which is characterized by having in its as-rolled state a tensile strength of 120-150 kgf/mm2 and a bending breakage rate no higher than 15% when tested according to JIS Z-2248 under the conditio... | 03/27/2001 |
| 6193816 | Spring with corrosion fatigue strength A spring is provided having a high durability in actual use and sagging resistance of the same level as or higher than conventional ones through improvement of the corrosion fatigue resistance. The spring uses as a material a steel including C: 0.35-0.55%... | 02/27/2001 |
| 6174390 | Spiral parts heat treatment apparatus and method, and spiral part A spiral parts heat treatment apparatus includes a first guide, a transfer unit, a second guide, and a controller. The first guide has a carrier portion that continuously conveys the manufactured spiral parts carried thereon in a longitudinal direction. T... | 01/16/2001 |
| 6132533 | Method for making arcuate coil springs, resulting springs and devices for carrying out the method The invention relates to a method for making arcuate coil springs from straight coil springs and particularly includes a phase of bending the straight springs during a heat treatment, which method provides exceptional results in that for the bending, a la... | 10/17/2000 |
| 6106639 | Stainless steel wire and process of manufacture Stainless steel wire of diameter smaller than 2 mm and with a tensile strength greater than 2100 MPa, consisting of a steel whose chemical composition includes, by weight: 0%ࣘCࣘ0.03%, 0%ࣘMnࣘ2%, 0%ࣘSiࣘ0.5%, 8%ࣘNiࣘ9%, 17%ࣘCrࣘ18%, 0%... | 08/22/2000 |
| 6074496 | High-strength oil-tempered steel wire with excellent spring fabrication property and method for producing the same A high-strength oil-tempered steel wire with excellent spring fabrication property that is made of spring low-alloy steel, having a decarburized layer of reduced hardness extending to a depth of not greater than 200 μm from the wire surface, a wire surfa... | 06/13/2000 |
| 6022427 | Method for producing helical springs A method of manufacturing helical springs from steel wire. The springs' skin is thermomechanically hardened by shot peening the unstressed springs followed by thermally destressing them, and shot peening them again. The second shot peening is carried out ... | 02/08/2000 |
| 6017641 | Coil spring resistive to delayed fracture and manufacturing method of the same A coil spring made of an oil-tempered steel wire with internal hardness of more than Hv 550 in cross-section, the surface hardness of the oil-tempered steel wire being determined in an extent between Hv 420 in a minimum value and hardness defined by subtr... | 01/25/2000 |
| 5930897 | Method and apparatus for tempering knotted coil springs Disclosed herein is apparatus for fabricating a coil spring including axially opposite end convolutions having respective ends respectively knotted to the associated end convolutions, which apparatus comprises a frame, a coil forming device mounted on the... | 08/03/1999 |
| 5897717 | High strength spring steel and process for producing same The present invention provides, at low cost, a valve spring steel having a tensile strength as high as 210 to 240 kgf/mm2 after oil tempering. The high strength spring steel comprises, based on weight, 0.65 to 0.85% of C, 1.90 to 2.40% of Si, 0... | 04/27/1999 |
