JPS6349744Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a watch case structure in which a back cover made of synthetic resin is fastened to a body made of metal with bites.

[Conventional technology]

As shown in Fig. 1, the conventional watch case structure is such that a dowel 2a of a case back 2 made of stainless steel (hereinafter referred to as SS) is fixed with a dowel in a groove 1a provided in a body 1. 4, it was common to use a middle frame 3 made of synthetic resin.

[The problem that the idea attempts to solve]

However, in the above-mentioned conventional technology, when using a shell whose material is lower in hardness than SS material, or which is plated or anodized, the shell biting portion 1b
When the SS back cover is attached and detached, it undergoes plastic deformation, and the gap height P cannot be kept constant, causing play in the dial gap and in the vertical direction of the movement. Also,
When attaching and detaching the SS back cover, from the biting part 1b of the body 1,
The material of the plating and body is scraped off and turned into powder, which enters the inside of the movement 4 and causes the movement to stop. Processing the back cover 2 made of SS requires several presses,
This method has drawbacks such as the need to strictly control the dimensional accuracy of the dowel height of the dowel 2a.

Therefore, the present invention attempts to solve such problems, and its purpose is that when a metal material with low hardness, such as a plated zinc case, is used for the case, the back lid has a bulge structure. The aim is to stabilize quality and reduce costs.

[Means to solve the problem]

The watch case structure of the present invention consists of a metal body 1
In a watch case structure in which a back cover 12 made of synthetic resin is fixed to the back cover 1 with a dowel, the back cover 12
is an outer mountain portion 1 that is engaged with the body 11 on the outside thereof;
2a, an inner ridge portion 12b in which the movement 14 is positioned inward than the outer ridge portion 12a, and a valley portion 12c formed between the outer ridge portion 12a and the inner ridge portion 12b are integrally formed. ,
Furthermore, the outer surface of the outer mountain part 12a is formed with a dowel 12a1 that is fixed to the groove 11a of the body 11 with a bite, and a dowel 12a1 is partially formed therebelow. A collar portion 12a2 is formed, and the inner mountain portion 12b
A side wall 12b2 is formed for positioning the movement 14 in the horizontal direction, and a stepped portion 12b1 is formed for placing the movement 14 and positioning it in the vertical direction, and the thin metal plate 12d is bent and fixed to the collar portion 12a2. It is characterized in that a bent portion 12d1 is formed.

〔Example〕

Hereinafter, the present invention will be explained in detail based on examples.

In FIGS. 2, 3, 4, and 5, a groove 11a formed in the inner wall of the case 11 is engaged with the outer ridge 12a of the case back 12 made of synthetic resin.
The dowel 12a1 with a dowel is fixed with a dowel (snap pushed in and fixed), and in order to fix the movement 14, an inner mountain part 12b that is integrally formed with the back cover 12 is formed, and the back cover and movement are fixed. Perform this on the same parts at the same time. The inner ridge portion 12b of the back cover 12 is formed above the stepped portion 12b.
1, the movement 14 is pushed upward through the dial 15, and by bringing the dial 15 into contact with the stepped portion of the body 11, vertical positioning and fixing are performed. The movement 14 is positioned in the horizontal direction. The material of the body 11 may be brass, zinc, aluminum, etc. plated with chromium, gold, nickel, palladium, etc., or anodized aluminum.
It is particularly effective when using materials with lower hardness and adhesion than SS. The material of the back cover 12 is
Made of synthetic resins such as ABS resin, polycarbonate, and polyacetal. Valley part 12c in the middle of the back cover
, when the dowel 12a1 of the back cover 12 bites into the groove 11a of the copper 11, the outer peak 12a touches the valley 12c.
It is easy to elastically deform to the side. 12d
is an SS thin sheet metal which is a thin corrosion-resistant member with a thickness of approximately 0.1 mm to 0.6 mm, and the bent portion 12 of the thin sheet metal 12 is partially bent to the adhesive film 12e and the collar portion 12a formed on the back cover 12.
It is fixed to the main body made of synthetic resin by d1. The 12f section has a horizontal interference margin or a gap of 0.1 mm or less between it and the shell 11. By bending one of the bent portions 12d1 so as to contact the body 11, it is also possible to establish electrical continuity with the body 11, thereby providing an electrostatic shielding effect.

Other embodiments of the present invention are shown in FIGS. 6 and 7,
FIG. 6 is a sectional view of the main parts corresponding to FIG. 2, and FIG. 7 is a plan view of only the back cover, corresponding to FIG. 3. In this case, the planar arrangement of the outer ridge portion 12a of the back cover 12 and the inner ridge portion 12b for supporting the movement is changed from the case shown in FIGS. 2 to 5 in a direction perpendicular to that shown in FIGS. With this arrangement, as seen in FIG. 6, the outer ridge portion 12a and the inner ridge portion 12b do not overlap in the radial direction (alpha direction in FIG. 6), and therefore, the valley portion 12c between them also does not overlap. Since it does not exist in the radial direction, the radial dimension of the watch case can be reduced overall, and miniaturization can be achieved. Furthermore, Figure 6,
The symbols in FIG. 7 are the same as in FIGS. 2 to 5.

[Effect of idea]

As described above, according to the present invention, the case back made of synthetic resin is formed with an outer ridge portion having a dowel with a groove which is fixed to the groove of the body on the outer side, and a valley portion on the inner side thereof. Due to the void formed by the synthetic resin, the outer ridge can be freely deformed at least in the horizontal direction due to the elasticity of the synthetic resin and the fact that there is no obstacle inside the outer ridge. As the stress acting on the dowel on the part and the inner wall of the body is released by the deformation of the outer crest, the inner wall of the body, especially the corner part of the groove and the dowel on the back cover, are scraped and chips. It is possible to prevent quality defects that can be fatal to a watch, such as intruding into the movement and stopping the movement, and the deformation of the outer crest prevents the dowel and the groove of the body from getting stuck. Because it becomes easier,
This has the effect of widening the allowable range of dimensional accuracy between the dowel and the groove, and facilitating dimensional control.

In addition, the case back is integrally formed with an inner ridge portion, and the inner ridge portion is formed with a stepped portion and a side wall for positioning the movement in the vertical and horizontal directions. Since the movement can be reliably positioned using the inner mount alone without the need for separate members for positioning, such as an inner frame or a fixing ring, the number of parts can be reduced and assembly and disassembly can be facilitated, leading to cost reductions. Furthermore, the formation of the inner ridge portion located inward of the outer ridge portion also has the effect of reinforcing the rigidity of the back cover.

In addition, since the outer surface of the case back made of synthetic resin is covered with a thin sheet metal of stainless steel, which is a corrosion-resistant material, the synthetic resin part is not exposed to the outer surface, which makes up for the low-grade feel of synthetic resin, and has excellent corrosion resistance, such as Corrosion caused by sweat generated from the arm is prevented, and the rigidity of the back cover is improved, in addition to the reinforcing effect of the inner crest, compared to, for example, the case of a single synthetic resin made of only the outer ridge in the conventional technology. Since this can be significantly improved, it has the effect that a thinner case can be provided.
Furthermore, since the thin sheet metal has a bent part and is bent and fixed to the collar, it will not peel off even when the case back is removed using a kojiake jig. It is possible to ground static electricity to the human body, and it also has the effect of being able to take measures against static electricity on the movement's IC.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of the structure of a conventional watch case with a doweled back lid. FIG. 2 is a sectional view of an embodiment of the present invention. FIG. 3 is a plan view of only the back cover of FIG. 2. Fourth
The figure is a sectional view taken along line X1-X2 in FIG. FIG. 5 is a sectional view taken along Y1-Y2 in FIG. 3. FIG. 6 is a sectional view of another embodiment. FIG. 7 is a plan view of only the back cover of FIG. 6. 1, 11... Trunk, 1a, 11a... Groove of trunk,
2, 12...Back cover, 2a...Dowel with bite, 12
a...Toyama part, 12a1...Dowel with bite, 12a
2...Tlaw part, 12b...Uchiyama part, 12b1...
Stepped portion, 12b2...Side wall, 12c...Trough, 12
d...Thin sheet metal (SS), 12d1...Bending portion, 3...Inner frame, 4, 14...Movement,
5,15...Dial board.

Claims (1)

[Utility model registration claim] Body 11 made of metal with lining 1 made of synthetic resin
In the watch case structure in which the case back 12 is fixed with a dowel, the case back 12 has an outer mountain portion 12a on the outside thereof that is engaged with the case 11, an inner mountain portion 12b on the inside of the outer mountain portion 12a where the movement 14 is positioned, and a groove 12b between the outer mountain portion 12a and the inner mountain portion 12b.
The outer ridge portion 12a is integrally formed with a valley portion 12c formed between the groove 11a and the outer ridge portion 12a, and the outer ridge portion 12a is further covered with a thin plate metal 12 made of a corrosion-resistant material. The outer ridge portion 12a is partially formed with a dowel 12a1 that is fixed to the groove 11a of the body 11, and a flange portion 12a2 is formed below the dowel 12a1.
A watch case structure characterized in that the inner mountain portion 12b is formed with a side wall 12b2 that positions the movement 14 in the horizontal direction and a step portion 12b1 that places the movement 14 on and positions it in the vertical direction, and the thin plate metal 12d is formed with a bent portion 12d1 that is bent and fixed to the flange portion 12a2.