JPH1020261A - Plating treatment of spectacle hinge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lock external thread shafts and to ensure smooth rotating operation by subjecting spectacle hinges to a composite plating treatment. SOLUTION: A lubricative and wear resistant composite plating film is formed by an easy plating treatment technique in a turning part 3. Namely, a sliding contact surface 11 is the intercontact surface of a stationary lower sliding surface and a turning upper sliding surface. The contained compd. particles 13 dispersed in the film base material 12 of the turning part 3 partly forms a rigid eutectic film 14 on the surface. In the case of, for example, a fluorine compd., the contained compd. particles are softened or dissolved by heating, etc., and are thereby codeposited on the surface, by which the lubricity is maintained as the eutectic film 14 and hardness is improved. The film base material 15 applied at a screw fixing part forms a sliding contact surface 11 by a soft sliding fit surface 17 by a small amt. of the contained compd. particles. Further, blisters 20 by an edge effect are generated by a high current density in the parts at the front ends of the screw threads 19 of internal screw threads existing on the lower plate 5 of the screw fixing part. These blisters press the valleys of the external screw shaft, by which the effect of locking is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plating process for an eyeglass hinge.

[0002]

2. Description of the Related Art Eyeglass hinges of eyeglass frame components are usually made of a metal material such as copper alloy or stainless steel in various designs consistent with the eyeglass frame. Basically, as shown in the schematic assembly diagram of FIG. 1, a male screw shaft 1, a screw fixing portion 2, and a rotating portion 3,
Separated into elements. Since the male screw shaft 1 is dropped or lost, or abrasion deformation of the driver groove occurs, a commercially available standard product such as easily replaceable stainless steel is usually used. Screw fixing part 2
Is integrated with the lens frame side. The rotating portion 3 is integrated with what is usually called a vine on the ear hanging side. The screw fixing part 2 and the rotating part 3 made of a metal material are usually subjected to surface treatment by plating for aesthetics, corrosion protection, and surface hardening.

[0003]

The eyeglass hinge (1) It cannot be said that a mechanism having a good effect is obtained only by turning the turning portion 3 smoothly around the male screw shaft 1 serving as a support shaft. Upper plate 4 and lower plate 5 of screw fixing portion 2 by tightening and adjusting male screw shaft 1.
The distance between the lower sliding 6 and the rotating upper sliding surface 7 of the rotating unit 3 and the sliding torque of the contact surface between the lower rotating sliding surface 8 and the fixed upper sliding surface 9 are used. Is adjusted to suit the person, and this contact surface generates a sliding fit surface,
Hard and soft surface treatments are desirable. (2) Regarding the male screw shaft 1, the mating female screw 18 is desirably subjected to a surface treatment for preventing loosening. (3) A hard and lubricious surface treatment is desirable for the rotation inner diameter 10 that rotates about the male screw shaft 1 as a core.

[0004]

SUMMARY OF THE INVENTION The present invention provides nickel,
Silver, Cu-Sn alloy, palladium and palladium alloys, cobalt, copper and copper alloys, zinc and zinc alloys as main components, PTFE having self-lubricating properties, carbon fluoride, molybdenum disulfide, boron nitrite, etc. The above-mentioned problems are solved by a plating technique using a composite plating in which a coating thickness and the content of contained compound particles are increased and decreased, and an edge effect is utilized.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS It is difficult in terms of work and cost to apply completely different plating to each of the items (1), (2) and (3) in the preceding item. According to the present invention, in the above composite plating, in the item (1), when the contained compound is a fluorine compound, the particle size is set in the range of 0.1 to 1 μm, and the dispersion amount in the plating bath is 10 ３０30 g / l. In the rotating section 3, the amount is 50 to 100 g / l. (2) The film thickness is 5 to 10 μm in the screw fixing portion 2
And In the rotating part 3, the thickness is set to 20 to 50 μm. As a result, a lubricating and surface-adhesive composite plating film is formed on the screw fixing portion 2, and a lubricating and wear-resistant composite plating film is formed on the rotating portion 3 by an easy plating technique. You. In the rotating part 3, the contained compound particles are dispersed in the coating matrix, and a part thereof is exposed on the surface.
In the case of a fluorine compound, the compound particles are softened or dissolved by heating or the like to cause eutectoid deposition on the surface, thereby maintaining lubricity as the eutectoid coating 14 and improving hardness. FIG. 2 is an enlarged view of the above-described partial explanation. Reference numeral 11 denotes a sliding contact surface, which is a contact surface between the fixed lower sliding surface 6 and the rotational upper sliding surface 7. Coating body 1 applied to rotating part 3
Part of the compound particles 13 dispersed in 2 becomes a hard eutectoid coating 14 on the surface. The coating matrix 15 applied to the screw fixing portion 2 forms a sliding contact surface 11 by a soft sliding conforming surface 17 formed by a small amount of compound particles 16.
FIG. 3 is a partially enlarged view of the distal end of the thread 19 of the female screw 18 on the lower plate 5 of the screw fixing portion 2. Due to the high current density, bulge due to the edge effect as shown at 20 occurs at the tip of the screw thread 19, which presses the valley of the male screw shaft 1 and exerts a locking effect. 1 is provided with a thick hard, wear-resistant and lubricious eutectoid coating 1 as shown in the lower part of the sliding contact surface 11 of FIG.
4 facilitates the turning operation.

[0006]

The present invention can easily solve various problems of eyeglass hinges by the composite plating technique and greatly contributes to the development of the eyeglass industry.

[Brief description of the drawings]

FIG. 1 is a schematic assembly view of an eyeglass hinge.

FIG. 2 is a partially enlarged view illustrating an embodiment of the present invention.

FIG. 3 is a partially enlarged view of an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Male screw shaft 2 Screw fixing part 3 Rotating part 4 Upper plate 5 Lower plate 6 Fixed lower sliding surface 7 Rotating upper sliding surface 8 Rotating lower sliding surface 9 Fixed upper sliding surface 10 Rotating inner diameter 11 Sliding contact Surface 12 Coating matrix 13 Containing compound particles 14 Eutectoid coating 15 Thin coating matrix 16 Small amount of compound particles 17 Sliding conforming surface 18 Female screw 19 Screw thread 20 Bulge

Claims (3)

[Claims] 1. A composite plating process of eyeglass hinges for preventing a male screw shaft from being loosened by an edge effect in a plating operation. 2. A composite plating process for eyeglass hinges in which lubricating properties are maintained, hard and soft sliding surfaces are brought into contact with each other, and a coating for generating a sliding conforming surface is adhered. 3. A composite plating process for an eyeglass hinge in which a hard and lubricious coating is closely attached to a rotation inner diameter rotating around a male screw shaft as a core.