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US 6,439,662 B2Granted
Spindle for a height regulating device
AssigneeSamhongsa Co., Ltd.
InventorDong Kwan Ma
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AssigneeSamhongsa Co., Ltd.
InventorDong Kwan Ma
Estimating the term…
A spindle base which constitutes a height regulating device of a chair, and it is an object of the present invention to improve the corrosion resistance, the abrasion resistance, the fatigue strength, and the reverse bending stress of the spindle body by coating a nitration layer of a predetermined thickness on the inner and outer surfaces of the spindle base. A height regulating device gas comprises a spindle base, a cylinder formed in the spindle base, a piston slidably moved in the cylinder, and a spindle having a piston rod having one end connected to the piston. The other end of the piston rod is fixed to one end of an outer case and the spindle is moved upward and downward through the outer case based on the piston rod and the outer case. The spindle base is comprised of a metal and nitration layers are formed on the inner and outer surface of the metal.
A height regulating gas device which comprises a spindle base, a cylinder formed in the spindle base, a piston slidably moved in the cylinder, and a spindle having a piston rod having one end connected to a piston and in which the other end of the piston rod is fixed to one end of an outer case and the spindle is moved upward and downward through the outer case based on the piston rod and the outer case, wherein the spindle base is comprised of a metal and nitration layers are formed on the inner and outer surface of the metal.
A height regulating device according to claim 6, wherein the thickness of the outside of the nitration layer is 10 to 20 μm.
Dependencies are inferred from the claim text.