JPS6227898Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The invention uses an inner frame for mechanically fixing a mobile watch.
This invention relates to a mechanical fixing device for a multi-purpose portable watch that double-protects the movement and the case back.

[Conventional technology]

The structure of a conventional mechanical fixing device for a portable watch is as shown in Fig. 1. 1 is a body, 2 is a middle frame, 3 is a back cover, and 4 is a case.
is a movement, in which the axial positioning of the movement 4 is performed by a spring portion 2b of the middle frame 2, and the horizontal positioning is performed by a partial collar projection 2a of the middle frame 2.

[Problem that the invention attempts to solve]

However, with the above-mentioned conventional technology, there was no protection against chips from the joints and joints generated when the case and case back were fixed, entering the movement and causing adverse effects such as the shot and rotor stopping. Furthermore, non-waterproof watch structures have the problem of being defenseless against dirt, dust, sweat, etc. that enter through the gap between the case and case back.
The purpose of this invention is to prevent dirt, dust, sweat, and chips generated when attaching and detaching the back cover from entering the movement, and at the same time protect the movement. , which attempts to ensure the axial and horizontal positioning of the movement.

[Means for solving problems]

The mechanical fixing device for a portable watch of the present invention has a cover that surrounds the side surface and back cover side of the movement, and a collar portion that contacts the inner circumferential wall of the body at the upper outer periphery. True 14b
A surface U-shaped relief portion 12e is provided to escape the
In addition, it has an inner frame made of synthetic resin on the lower bottom surface of which is provided with a protrusion 12b that contacts the inner surface of the back cover 13 and exerts a force on the back cover 13 in the axial direction, and the middle frame is provided between the body and the back cover. In a mechanical fixing device for a portable watch in which the movement is positioned and fixed,
The relief part 12e of the middle frame extends outward to reach the body, and the protrusion 12b on the bottom surface of the middle frame is arranged near the outer peripheral part in the opposite direction to the relief part 12e having a U-shaped cross section. It is characterized by the presence of

〔Example〕

The present invention will be described in detail below based on examples.

In Figure 2, 11 is the body, 12 is the middle frame, 13
The case back is pushed into the lower inner circumferential wall of the body, and 1
4 is the movement. The side of the movement 14 is the side wall 12c of the middle frame 12, the back cover side of the movement is the bottom wall 12i of the middle frame 12, and the gap between the body and the movement is between the outer shape of the collar 12f of the middle frame 12 and the inner peripheral wall of the body 11. Because they are close together, they are covered without any gaps. In particular, in the winding stem 14b, this collar part 12a has a U-shaped cross section as shown in the sketch shown in FIG.
This U-shaped relief part 12e extends outward in close contact with the body 11, so that the movement 14 can be completely isolated from the back cover 13 side. That is, it is possible to completely prevent chips, dirt, dust, sweat, etc. generated when the back cover 13 is removed from entering the movement side from the back cover side as described above. Especially the winding stem 1
4b, the U-shaped relief part 12e extends to the trunk 11 and completely covers it, so that the winding stem part 1
Chips from the hole where 4b engages with the movement 14,
No dirt, dust, etc. can enter. Preferred materials for the inner frame include flexible polyacetal, polycarbonate, polyester elastomer, and high-density polyethylene. The axial positioning of the movement is achieved by installing one or two protrusions 12b on the bottom of the inner frame that exert force against the case back 13 in the axial direction.
~6 locations are provided to push up the movement collar 14a via the middle frame 12d. The movement is positioned in the horizontal direction with respect to the barrel 11 using the inner frame collar 12a. Also, middle frame 12
is preferably processed by injection molding or drawing. The side wall 12c of the inner frame has a minimum shape that conforms to the outer shape of the movement 14, and the collar portion 12 of the inner frame
If a is set to the size of the expected maximum exterior model shape and only the flange outer shape 12f is pressed to match the internal shape of various models, the mold cost for the inner frame will be very low. According to this method, there is no need to change the push-up protrusion 12b in the axial direction of the movement for each model, and it is possible to unify the movement into one type. From a design point of view, the back cover slope portion 13a can be set to the minimum size without interfering with the position of the movement push-up portion. Furthermore, by providing the movement push-up protrusion 12b on the bottom of the middle frame near the outer periphery in the opposite direction to the U-shaped relief section 12e, the push-up force from the back cover is applied to the inner frame flange 12a and the U-shaped relief section. 12e tends to expand in the radial direction, so that it comes into contact with the inner circumferential wall of the cylinder more reliably, further enhancing the dust-proofing effect of the inner frame. Further, since the protrusion 12b is disposed near the outer periphery in the opposite direction to the U-shaped relief portion 12e, and the distance between the protrusion 12b and the U-shaped relief portion 12e is large,
The U-shaped relief part in cross section can avoid the direct pushing force from the back cover side that pushes up the movement, and there is little distortion or deformation in that part, so the relief part comes into contact with the winding stem and prevents the winding stem from moving in the axial direction. Good operability of the winding stem portion is ensured without any hindrance in terms of external operations such as rotational movement or rotational movement. In addition, the inner frame 12 made of synthetic resin has a collar portion 12.
By providing the relief part 12e with a U-shaped cross section, the cross-sectional area becomes larger and the rigidity is increased, so it has a reinforcing effect against distortion, deformation, etc. When the movement is supported on the body, the positional accuracy is also increased, and external disturbances are increased. Even with the addition of In particular, since a flange portion is formed over the entire surface of the U-shaped relief portion 12e, the rigidity of this portion increases, causing an adverse effect on the winding stem as described above. This allows for better operability of the winding stem.

In addition to the above-mentioned materials, the inner frame may be made of a highly magnetically permeable material such as permilion, pure iron, etc. to ensure high magnetic resistance.

The present invention is suitable for side structures where a gasket is not attached between the back cover and the body, or where chips are likely to be generated when the back cover is fixed to the body.

[Effect of idea]

As described above, according to the present invention, there is a U-shaped relief part in cross section that escapes the winding stem on the winding stem side of the collar part provided on the upper outer periphery of the inner frame that surrounds the side surface and the back cover side of the movement. It extends outward all the way to the body, and the protrusion on the bottom of the inner frame is placed near the outer periphery in the opposite direction to the U-shaped cross-section relief part, so that the flange of the inner frame and the U-shaped cross-section The die relief part securely comes into contact with the inner circumferential wall of the body due to the force that tries to spread in the radial direction in response to the push-up force from the case back, and prevents dust from entering the movement from the case back side, especially from the winding stem when the case back is attached or removed. It has the effect of reliably preventing the intrusion of dust, chips, sweat, etc. Furthermore, since the distance between the protrusion on the bottom of the inner frame and the U-shaped relief section is large, the U-shaped relief section can avoid the direct pushing force from the back cover that pushes up the movement, causing distortion of that part. Because there is little deformation,
The relief portion comes into contact with the winding stem and is not obstructed during external operations such as axial movement or rotational movement of the winding stem, thereby ensuring good operability of the winding stem. In addition, the inner frame made of synthetic resin has a brim portion and a U-shaped relief portion, which increases the cross-sectional area and increases the rigidity.
It has a reinforcing effect against deformation, improves positional accuracy when supporting the movement on the body, and ensures reliable support even when external disturbances are applied. In particular, since a flange part is formed over the entire surface of the relief part, which has a U-shaped cross section, the rigidity of this part is increased, and as mentioned above, there is no adverse effect on the winding stem part, and the winding stem This allows for better operability of the parts. Since the inner frame is made of synthetic resin, injection molding and drawing processing are possible, making manufacturing easy.

As described above, the present invention is an excellent device that is versatile and economical, and can be adapted to various exterior model variations.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional mechanical fixing device for a portable watch. FIG. 2 is a sectional view showing an embodiment of the mechanical fixing device for a portable watch of the present invention. Figure 3 is a sketch of the U-shaped cross-sectional relief part that escapes from the winding stem. 1, 11... body, 2, 12... middle frame, 12a...
...Brim part, 12b... Protrusion, 12e... Relief part,
3, 13...Back cover, 4,14...Movement.

Claims (1)

[Scope of utility model registration request] A collar is formed to surround the side and back cover sides of the movement, and is in contact with the inner circumferential wall of the body at the upper outer periphery, and has a U-shaped relief part in cross section that escapes the winding stem 14b on the winding stem side of the collar 12a. 12e is provided, and a protrusion 1 is provided on the bottom bottom surface of the lower part that contacts the inner surface of the back cover 13 and exerts a force on the back cover 13 in the axial direction.
It has a middle frame made of synthetic resin provided with 2b,
In a mechanical fixing device for a portable watch in which the movement is positioned and fixed between a case and a back cover via the middle frame, a relief part 12e of the middle frame extends outward to reach the case, and A mechanical fixing device for a portable watch, characterized in that a protrusion 12b on the bottom surface of the inner frame is disposed near the outer periphery in a direction opposite to the U-shaped relief section 12e.