JPH034066Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention mainly relates to a printed circuit board fixing structure for fixing a printed circuit board on which an appropriate electronic circuit is arranged inside a table clock or wall clock such as a crystal clock or transistor clock. It is something.

(Prior Art) Conventionally, as shown in FIGS. 5 and 6, two printed circuit boards 1 and 2 are sandwiched between a front case 3 and a rear case 4, and then mounted separately. It was fixed to the case using screws 5, 5, etc.

(Problem that the invention aims to solve) With the conventional mounting structure, the work process becomes complicated and inefficient, and the number of parts increases, which causes an increase in costs. It had drawbacks such as:

The present invention was developed in view of the shortcomings of the prior art, and allows for one-touch installation and removal of a printed wiring board without the need for any other mounting components when installing and fixing the printed wiring board inside the outer case of a watch. The technical objective is to improve the efficiency of the installation work by configuring the watch as described above, and to downsize the watch body and thereby reduce costs.

(Means for Solving the Problems) In order to solve the above-mentioned technical problems, the present invention first provides a plurality of claws having fitting and locking holes protruding from the joint part of the front case part, and A notched groove, a bottomed groove having an edge and a convex part for fitting the claw are formed in the joint part of the rear case part so as to face the part, and a bottomed groove is provided in the fitting and locking hole of the claw. At the fitting position of the protrusion for fitting the claw part, the fixing protrusion provided on the printed wiring board is held and positioned by the edge and one end of the fitting locking hole, and at the same time, the fixed protrusion provided on the printed wiring board The fixed concave portion is configured to be sandwiched and positioned between the joint portions at a position where the provided fixing recess is fitted into the claw portion.

(effect) The above technical means works as follows.

The tip inclined portion of the claw portion comes into surface contact with the inclined surface portion of the claw fitting convex portion protruding from the bottom surface of the bottomed groove, and the resilient claw portion rides on the inclined surface portion by the insertion action. After raising, the protrusion for fitting the claw part is lowered so as to fit into one end of the fitting locking hole on the rear case side, and at the same time, the fixing protrusion of the printed wiring board is fitted into the edge of the bottomed groove. It is clamped by one end of the mating and locking hole. In addition, when the front case part and the rear case part are abutted and fixed, the printed wiring board is clamped and fixed by the joint part of the front case part and the joint part of the rear case part, and the printed wiring board and the exterior part are fixed together. It will be completely fixed inside the case.
At this time, even if a tensile force is applied between the front case part and the rear case part, the vertical surface part of the claw fitting convex part functions as a stopper, and there is no fear that it will come off easily.

(Example) (FIGS. 1 to 4) Next, an example will be described with reference to the drawings. Reference numeral 10 designates an exterior case for a watch or the like made of elastic synthetic resin. The joint portion 11A has fitting locking holes 14 (square holes are adopted in this embodiment) having a total length of L ₂ and a tip inclined portion 15A at multiple locations as appropriate.
A protruding claw portion 15 is provided. Also, 16
is a bottomed groove portion, which is bored at a plurality of locations in the joint portion 12A to face the claw portion 15 of the front case portion 11. Reference numeral 16A denotes a notch groove, which is connected to the bottomed groove 16 via an edge 16B.

Reference numeral 17 denotes a claw fitting convex portion having an inclined surface portion 17A and a vertical surface portion 17B, and is connected to the rear case portion 1.
This is the bottom surface portion of the bottomed groove portion 16 provided in the rear case portion 12, and is formed to protrude at a distance l ₁ from the joint portion 12A of the rear case portion 12.

Therefore, by inserting the claw part 15 into the bottomed groove part 16 and fitting the claw part fitting convex part 17 into the fitting locking hole 14 provided in the claw part 15, the front case can be closed. The portion 11 and the rear case portion 12 can be abutted and fixed.

18 and 19 are printed wiring boards, respectively;
One printed wiring board 18 is provided with a fixing recess 18A for fitting the claw part 15 at a position opposite to the claw part 15 provided in the front case part 11 at the end thereof, and the other printed wiring board 19 is provided with a fixing recess 18A for fitting the claw part 15. A fixing convex portion 19A is provided for fitting and fixing into the fitting and locking hole 14 bored in the portion 15.

Therefore, the printed wiring board 19 is connected to the front case part 11 and the rear case part 12 by fitting the fixing convex part 19A into the fitting and locking hole 14 and by fitting the printed wiring board into the claw part 15 of the fixing recess 18A. Due to the collision with the outer case 10, it is securely fixed without rattling or falling off within the exterior case 10 and without the need for any other screws or the like.

In the state where the front case part 11 and the rear case part 12 are abutted and fixed as described above, the thickness of the fixing recess 18A of the printed wiring board 18 is Δl ₁ , the width of the fixing recess 18A is C, and the width of the fixing recess 18A is C, If the distance between the joint portion 12A and the vertical surface portion 17B of the claw fitting convex portion 17 provided in the bottomed groove portion 16 is l ₁ , then the projection 17 from the joint portion 1A of the front case portion 11 fits into the fitting locking hole 14. The distance L ₁ from the claw fitting convex portion 17 to the vertical surface portion 17B is L ₁ = l ₁
+Δl ₁ , and the distance from the vertical surface 17B of the claw fitting projection 17 to the edge 16B of the bottomed groove 16 is l ₂ , and the thickness of the fixing projection 19A of the printed wiring board 19 is fixed as Δl ₂ If the width of the convex portion 19A is b, then the length of the square hole of the fitting locking hole 14 is L ₂ = l ₂
+Δl ₂ . Also, the width of the fitting locking hole 14 is B, the width of the bottomed groove portion 16 is C ₁ , the width of the claw portion 15 is C,
Assuming that the width B ₁ of the claw fitting projection 17 is the width C ₂ of the fixed recess 18A and the width b of the fixed projection 19A, the relationship is as follows: C=C ₁ =C ₂ and B=B ₁ =b. Become.

Next, the assembly order of the present invention will be explained.

Although a plurality of claw portions 15 are formed to protrude from the front case portion 11, in order to clarify the assembled state, only one claw portion 15 will be explained below.

First, the fixing recess 18A provided at the end of the printed wiring board 18, on which an electronic circuit has been attached in advance, is fitted and fixed into the claw part 15 of the front case part 11. Next, the fixing convex portion 19A of the other printed wiring board 19 on which the electronic circuit is arranged in advance
is fitted and fixed into the square hole serving as the fitting and locking hole 14 bored in the claw portion 15. At that time, the claw portion 15 of the front case portion 11 to which the printed wiring boards 18 and 19 are assembled is connected to the cutout groove portion 16A and the bottomed groove portion 16 provided in the joint portion 12A of the rear case portion 12.
Insert it in the direction of arrow A. (See FIG. 4, top a) At this time, the tip inclined portion 15A of the claw portion 15 is connected to the claw fitting convex portion 17 which is protruded from the bottom surface of the bottomed groove portion 16.
in surface contact with the inclined surface portion 17A of the arrow A.
After the claw portion 15 having elasticity rides on the inclined surface portion 17A due to the insertion action in the direction, the claw portion fitting convex portion 17 is attached to one end P of the fitting locking hole 14 on the rear case portion 12 side. At the same time, the fixing convex portion 19A of the printed wiring board 19
is the edge 16B of the bottomed groove 16 and the fitting locking hole 1.
It is held between one end Q of 4. Also, as mentioned above, the front case part 11 and the rear case part 12
When the printed wiring board 1 and the
8 is clamped and fixed by the joint part 11A of the front case part 11 and the joint part 12A of the rear case part 12, and is completely fixed in the exterior case 10 together with the printed wiring board 19.

At this time, even if tension is exerted between the front case part 11 and the rear case part 12 in the direction of arrow E, the vertical surface part 17B of the claw part fitting convex part 17 functions as a stopper and there is no fear that it will come off easily. (See FIG. 4, top b) Note that two printed wiring boards 18 and 19 are attached to the front case portion 11.

(Effects) The present invention has the following unique effects.

In particular, a plurality of claws 15 having fitting and locking holes 14 are formed protrudingly on the joint portion 11A of the front case portion 11, and fixing recesses 18A for preventing the printed wiring board 18 from falling off are fitted into the claws 15. Then, the fixing convex portion 19A for preventing the printed wiring board 19 from falling off is fitted into the fitting and locking hole 14, and then the connecting portion 12A of the rear case portion 12 is fitted to face the claw portion 15. The claw portion 15 is inserted into the bottomed groove portion 16 which has a protrusion portion 17 for fitting the claw portion connected to the provided notch groove portion 16A, and the protrusion portion 17 for fitting the claw portion and the fitting locking hole 14 are connected to each other. Since the front case part 11 and the rear case part 12 are abutted and fixed together by fitting, there is no need to use any other screws or the like when fixing the printed wiring boards 18 and 19 into the exterior case 10. No fixing parts required
The assembly work time is shortened and it can be removed and fixed with one touch, and the cost is reduced by reducing the number of parts, and the timepiece body is made smaller and lighter by reducing the installation space inside the outer case 10. Also, the front case part 1
Even if a tensile force is applied between the rear case part 12 and the rear case part 12, the vertical surface part 17B of the claw part fitting convex part 17 functions as a stopper and will not easily come off.

[Brief explanation of the drawing]

Figures 1 to 4 show examples of the present invention. Figure 1 is a vertical right side view of the watch body, and Figure 2 shows the front case after the printed wiring board is attached to the front case. FIG. 3 is a perspective view of the main parts showing a state where the rear case part and the rear case part are abutted and fixed; FIG. 3 is a perspective view of the main part showing the state after the front case part and the rear case part are abutted and fixed; FIGS. FIG. 2 is a vertical sectional right side view of the main part of the attachment, illustrating the principle of operation of inserting and fitting the claw into the bottomed groove. FIG. 5 is a longitudinal sectional side view of a main part showing a conventional printed wiring board mounting structure, and FIG. 6 is a rear view seen from the direction of arrow P in FIG. DESCRIPTION OF SYMBOLS 10... Exterior case, 11... Front case part, 12... Rear case part, 14... Fitting locking hole, 15... Claw part, 16... Bottomed groove part, 16A...
...Notch groove, 16B...Edge, 17...Claw fitting projection, 18A...Fixing recess, 19A...Fixing projection, 18, 19...Printed wiring board.

Claims (1)

[Scope of utility model registration request] A plurality of claws 15 having fitting and locking holes 14 are provided protruding from the joint portion 11A of the front case portion 11, and a notched groove portion 16A and an edge are provided in the joint portion 12A of the rear case portion 12 to face the claws 15. 16B and the bottomed groove 16 having the claw fitting projection 17 are bored, while the claw fitting projection 17 of the bottomed groove 16 is inserted into the fitting locking hole 14 of the claw 15. In the fitting and locking position, the fixed protrusion 19A provided on the printed wiring board 19 is held and positioned by the edge 16B and one end Q of the fitting locking hole 14, and at the same time, the fixed protrusion 19A provided on the printed wiring board 18 A printed circuit board fixing structure configured to sandwich and position the fixing recess 18A between the joint portion 11A and the joint portion 12A at the position where the nail portion 15 is fitted.