JPH064614Y2 - Small electronic device housing escutcheon fixing structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a case of a small electronic device for loading a vehicle,
The present invention relates to a structure for fixing a front escutcheon to a rear chassis.

(Prior Art) A general appearance of a small electronic device casing is shown in FIG. 1
Is a plastic escutcheon located in the front, 2
Is a cover for covering the rear chassis, and 3 is a cover fixing screw.

FIG. 12 is a partial cross-sectional view of the right side surface of FIG. 11, and FIG. 13 is a partial cross-sectional view of the upper surface of FIG. Escussion 1
In the part, a unit in which an operation button for operating the electronic device, an operation knob, an LED for display, an LCD and the like are integrated is usually incorporated.

In FIGS. 12 and 13, reference numeral 4 denotes a chassis, which normally houses a printed circuit board or the like containing electronic circuits, and is located behind the escutcheon 1. Reference numeral 5 is a cover mounting tap hole provided in the chassis, and 6 is press-molded by a recess of a cover mounting screw portion provided in the cover. Reference numeral 7 denotes a fixed portion of the plastic escutcheon, which is integrally fixed to the chassis 4 extending rearward, and 8 denotes a counter screw for fixing the chassis 4 and the escutcheon 1.

The need for such a structure is to minimize the L dimension in FIG. 11, and the dimension in FIG.
It can be kept as small as 1.5 mm.

Details of the escutcheon fixing portion 7 are shown in FIG.
9 is a countersink whose sectional shape is shown in FIG. Around the hole 9 of the plastic product, the flow of the plastic material at the time of plastic molding is divided into both sides of the hole 9 and joins again on the side opposite the hole. That is, there is a convex mold corresponding to the shape of the hole 9, and the flow of the plastic material flows around the convex mold and merges again toward the convex mold. In a plastic molded product, a visible line is formed at the confluence of the materials, which is called a weld line or weld mark. This weld line or weld mark is generated because the material temperature does not completely fuse when the materials join together again.It is generated far from the gate of the mold and more than other parts of the same molded product. It is generally brittle and easily destroyed. In FIG. 14, 10 is a weld line. With such a structure, when the escutcheon 1 is fixed to the chassis 4 with the escutcheon fixing screw, the slope of the countersunk screw 8 contacts the slope of the countersink 9 as the tightening of the countersunk screw 8 progresses. ,
A force for expanding the countersink 9 acts. The force received by the countersink 9 concentrates on the weakest weld line 10 and causes cracking. The tightening torque of the countersunk screw is regulated to prevent the cracks, but cracks may occur after a long time.

FIG. 16 is a partial cross-sectional view of the upper surface of another example of the escutcheon fixing structure. The fixing part 7 extending rearward integrally with the escutcheon 1 and the chassis 4 are fixed by using a pan head screw 8 ', and the position of the fixing part 7 extending rearward from the escutcheon 1 is the same as the conventional widthwise direction of the housing. It is located on the inner side of the example, that is, a distance of _{1 from the} cover 2 is required, and the space for the electronic components housed inside the chassis 4 is reduced accordingly. Or conversely, a storage space for electronic components plus 2
A width of ₁ is required. In the case of the small electronic device targeted by the present invention, it is not negligible to increase the size of the housing by, for example, 3 mm to 10 mm. In addition, in the case of FIG. 16, not only the head height of the pan head machine screw 8 ′ but also the reinforcing rising portion 7 ′ of the fixing portion 7 may be provided. Considering the dimension _{2 of} this rising portion. The _one dimension may be about 10 mm, and there is a risk of cracking of the weld line when tightening even with a pan head machine screw.

(Problems to be solved by the invention) In the above two conventional examples, when fixing with a counterscrew to reduce the lateral width of the housing, cracks in the weld line around the countersink, tightening torque management during assembly, etc. However, there are drawbacks such as the troublesomeness of work and the size of the housing being increased by the dead space of the escutcheon fixing portion.

The purpose of the invention is to eliminate the dead space in the fixed part of the escutcheon and the chassis, and to eliminate the trouble of tightening torque management to prevent cracks or cracks near the flat screw even if fixed with a flat screw. To do.

(Means for Solving the Problem) Under the above background, the present invention eliminates a weld line around a countersink, particularly when using a countersunk screw that can reduce the size of the housing. A part of the periphery of the hole is cut out, and a stopper portion for suppressing the spread of the escutcheon fixing portion is provided around the fixing portion. The embodiments will be described in detail below with reference to the drawings.

(Embodiment) FIG. 1 shows an escutcheon of the present invention, in which 11 is a fixed portion extending rearward integrally with a plastic escutcheon 1, which is provided on two upper and lower sides of the escutcheon. 12 is a countersink and 13 is a notch. In this embodiment, the positions of the notches 13 are provided symmetrically with respect to the upper and lower fixing parts, but the positions are not particularly limited. By providing the notch 13, the material flow during the plastic molding flows as shown by the arrow a, there is no confluence of the material flow, no weld line is generated, and a uniform state is obtained in which there is no weak or brittle portion. If a countersunk screw (not shown in FIG. 1) is passed through the countersink 12 and tightened as it is, the fixing portion 11 is deformed in the direction of the arrow b. That is, it is deformed by the tightening force of the countersunk screw in the direction opposite to the notch 13 and in the direction perpendicular to the notch 13. Therefore, as shown in FIG. 2 of the embodiment of the present invention, by providing the stopper 15 in the deformation direction of the fixing portion 11, the deformation is prevented and at the same time, the contact force between the stopper 15 and the fixing portion 11 and the tightening force of the screw. Thus, the chassis 14 and the escutcheon 1 can be fixed more firmly. In FIG. 2, the stopper 15 is formed by stamping a part of the chassis 14, that is, the deformation direction of the fixed portion 11, and is opposite to the cutout portion 13 of the fixed portion 11 and is perpendicular to the cutout portion 13. That is, the barriers 16 and 17 are provided in the direction substantially equal to the thickness of the fixed portion 11. FIG. 3 shows a sectional view taken along the line AA in FIG. Reference numeral 16 is a barrier formed by partially embossing the chassis 14 having a thickness substantially equal to that of the fixed portion 11. By tightening the countersunk screw, the upper and lower fixing parts 11 are pressed against the barrier 16 of the stopper 15 so as to sandwich the stopper 15, and the fixing part 11 is prevented from being deformed. It can be firmly fixed.

FIG. 4 shows another embodiment of the present invention, in which a portion of the chassis 14 corresponding to the fixing portion 11 is concavely recessed.
5'becomes a stopper. The cross section A'A 'is the same as that of FIG. 3 of the above embodiment, 16' and 17 'serve as the barriers of the stopper 15', and the operation is the same as that of the above embodiment.

FIG. 5 shows another embodiment in which a rail plate 18 is attached to a chassis 14 '.
It is the case when is attached. The rail plate 18 allows a rail groove 18 'to be attached to a guide on a mounting base (not shown) for mounting on a vehicle or the like, and FIG. 6 shows a state before mounting the escutcheon. Reference numerals 19 and 20 are parts of the rail plate 18 and serve as the barriers described above. Reference numeral 21 is an escutcheon mounting tap hole formed in the chassis 14 '. FIG. 7 is a partial cross-sectional view of the housing with the rail plate 18, and 22 is a cover. Further, FIG. 8 shows another embodiment in which the tap hole 21 of FIG. 6 is provided at a position corresponding to the escutcheon fixing portion of the rail plate 18 ″, 23 is a tap hole and 24 is a surface.
It is recessed from the surface of No. 5 by the thickness of the escutcheon fixing portion. 26 and 27 serve as barriers for preventing the deformation of the escutcheon fixing portion. FIG. 9 shows another embodiment in which the cutouts 29 of the escutcheon fixing portion 28 are in the same direction in both the upper and lower fixing portions, and the barriers 31 and 32 of the stopper 30 are in the opposite direction and at right angles to the cutout 29. It is provided in the direction. FIG. 10 shows another embodiment in which one escutcheon fixing portion 33 is provided on both sides of the escutcheon lateral width direction, where 34 is a countersink, 35 is a notch, and 36 is a stopper. In this case, the barrier of the stopper 36 is provided with 37 in the direction perpendicular to the notch 35 and 38 in the same direction as the notch 35. The position of the cutout portion 35 of the countersink 34 in the above description is not particularly limited, and the structure of the stopper 36 and the position of the barrier should be such that the deformation of the escutcheon fixing portion 33 due to the cutout portion 35 is prevented. It serves a purpose, but is not limited thereby. In FIG. 10, reference numeral 39 denotes a recess provided at a position in front of the countersink 34 of the escutcheon fixing portion 33.
By locking a part of the stopper 36 to the front side, the forward movement of the escutcheon due to the tightening of the countersunk screw is suppressed.

Further, although the above description mainly focuses on the provision of the escutcheon fixing portions on both side surfaces of the escutcheon in the widthwise direction, the object, the structure and the operation are the same even if they are provided in the longitudinal direction, that is, in the vertical direction of the housing, and the countersunk screw is used. Although the use of is described above, it is also applicable to the mounting holes of pan head screws.

(Effects of the Invention) As described above, the escutcheon of the small electronic device housing and a part of the mounting hole of the fixing part for fixing the chassis are cut out to eliminate the weld line at the time of plastic molding. By preventing the deformation at the time of tightening the screw due to the provision, and by providing a stopper that obtains the pressure contact force, it is possible to prevent the fixing part from cracking and improve workability and quality even when using a countersunk screw. It can be widely applied to small electronic device housings.

[Brief description of drawings]

1 to 3 show one embodiment of the present invention, FIGS. 4 to 10 show another embodiment, FIG. 11 shows an external view of a general small electronic device, and FIGS. Fig. 12 is an explanatory view of the device.
The figure is a partial cross-sectional view of the side surface, and FIG. 13 is a partial cross-sectional view of the upper surface.
14 and 15 are detailed views, and FIG. 16 is a partial top sectional view of another conventional example. 11, 24, 28, 33 ... Escushon fixing part, 1
2, 34 ... Countersink, 13, 29, 35 ... Notch, 14,
14 '... Chassis, 15, 15', 30, 36 ... Stoppers, 16, 17, 16 ', 17', 19, 20, 26,
27, 31, 32, 37, 38 ... Stopper barrier, 1
8,18 "... Rail plate, 21,23 ... Tap hole, 22 ...
cover.

Claims (3)

[Scope of utility model registration request] 1. A structure comprising a plastic escutcheon (1), a chassis (14) and a cover for covering the chassis (14), wherein the plastic escutcheon (1) is fixed to the chassis (14) with machine screws. The fixing part (11) is formed integrally with the escutcheon (1) in the direction of the chassis (14), and the fixing part (11) has a shape in which a part of the periphery of the fastening hole (12) is cut out, and the fixing part is formed. A part of the chassis (14) corresponding to (11) has a barrier (1
An escutcheon fixing structure for a small electronic device housing, which is provided with 6) and 17). 2. The escutcheon fixing structure for a small electronic device casing according to claim 1, further comprising barriers (19), (20) provided as stoppers which are separate from the chassis (14 '). 3. A cutout portion (3) of the escutcheon fixing portion (33).
5) is arranged behind the tightening hole (34), a recess (39) is provided in a part of the fixing part (33) in front of the tightening hole (34), and the stopper barrier corresponding to the shape of the fixing part is formed. (37), (38) is provided, The escutcheon fixing structure of the small electronic equipment casing of Claim 1 or 2 characterized by the above-mentioned.