JPH0648730Y2 - Waterproof electrical equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of the Invention] (Industrial field of application) The present invention is a waterproof electric device in which a device body is housed in an opening formed in one side surface of a case so as to be insertable and removable. Regarding

(Prior Art) In this type of electric device, for example, a waterproof photoelectric switch, a device body is inserted and accommodated in the case through an opening formed on one side surface of the case. With this configuration,
The housed device body is fixed in a retaining state by a locking member provided in the case, and the device body cannot be removed from the case unless the case is broken.

However, in the above configuration, since the device body cannot be repaired when the internal circuit of the device body fails, it is considered that the device body can be detached from the case. As an example of this configuration, there is a case in which a through hole through which a screw is inserted is formed in the case, and the device main body housed in the case is fixed in a retaining state by the screw through the through hole.

(Problem to be Solved by the Invention) However, in the above-mentioned configuration, since the through hole for the screw is formed in the case, it is necessary to seal this portion for waterproofing, and there is a problem that the number of sealing points increases. there were.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a waterproof electric device capable of suppressing the increase in the number of sealed portions of the case while making the device body removable from the case.

[Structure of the Invention] (Means for Solving the Problem) In the waterproof electric device of the present invention, the circuit board is arranged in the case with the device body having the circuit board through the opening formed on one side of the case. As described above, a cable insertion hole is formed on the other side surface of the case in which the opening is formed, the cable insertion hole being accommodated so that the cable can be inserted from the circuit board of the device body. The opening is sealed by the device body through packing, and
In a configuration in which a pre-molded portion formed on the cable is fitted into the cable insertion hole to seal the two by packing, the attachment is fixed to a portion in the case near the cable insertion hole, In the state where the pre-molded portion of the cable is pulled out from the cable insertion hole to the outside, a clamp fitting provided so as to be able to release the fixation with the case through the cable insertion hole by a tool is provided, and provided on the clamp fitting. It is characterized in that it is provided with a claw portion that restricts the movement of the device body in the removal direction by engaging with the engagement recess formed in the device body housed in the case.

(Operation) According to the above means, when the device body is removed from the case, first, the fixing between the clamp metal fitting and the case is released.
Specifically, the engagement between the cable bush and the tubular portion of the case is released, the cable is pulled outward, and the premolded portion of the cable is pulled out from the cable insertion hole to the outside. Then, in this pulled-out state, the fixing of the clamp fitting and the case is released by the tool through the cable insertion hole.
As a result, the engagement between the claw portion provided on the clamp metal fitting and the engagement recess formed on the device body is released, so that the movement restriction state of the device body housed in the case in the removal direction is released. To be done. After this, move the device body in the removal direction and remove it from the case. In this case, since the cable insertion hole for inserting the cable is originally used when removing the clamp metal fitting, it is not necessary to separately provide a through hole for removing the clamp metal fitting in the case, and the number of sealing portions does not increase.

(Embodiment) A first embodiment in which the present invention is applied to, for example, a photoelectric switch will be described below with reference to FIGS. 1 to 8.

First, in FIGS. 1 and 2, the case 1 is made of, for example, zinc die cast and has a box shape as a whole. An opening 1a is formed on the left side in the drawing, which is one side of the case 1. Further, an opening 1b is formed on the upper surface of the case 1, and a cover 2 made of a transparent member is rotatably provided on the case 1 so that the opening 1b can be opened and closed. This cover 2
Is screwed to the case 1 while the opening 1b is closed via the annular packing 3.

On the other hand, the device body 4 having a rectangular shape as a whole is housed in the case 1 so that it can be inserted and removed through the opening 1a (see FIG. 1). Inside the device body 4, a light projecting element 5 and a light receiving element 6 are arranged. On the left side of the device main body 4 in the drawing, there is provided a light projecting / receiving section 8 having a light projecting lens and a light receiving lens 7 (not shown). As shown in FIG. The opening 1a is closed. An annular packing 9 is interposed between the light emitting / receiving unit 8 and the opening 1a, so that the space between them is sealed. Further, two display elements 10 (only one of which is shown) made of a light emitting diode or the like and provided with an operating state are provided on the upper part of the device body 4, and an adjusting knob 11, a switch 12 and the like are provided. As shown in FIG. 1, the display element 10 is exposed from the opening 1b on the upper surface of the case 1, and the adjustment knob 11 and the switch 12 can be operated from the outside through the opening 1b. A printed wiring board (not shown) to which a control circuit and the like are attached is provided inside the device body 4, and a shielding film 13 is provided so as to cover the board.

A cable 14 is led out from the device body 4.
Corresponding to the cable 14, a cable insertion hole 1c for inserting the cable 14 is formed in the inclined wall portion 15 at the lower right of FIG. 1 of the case 1. On the outer surface of the inclined wall portion 15 of the case 1, a cylindrical portion 1d that is continuous with the cable insertion hole 1c is provided in a protruding manner. A pre-molded portion 14a is formed on the cable 14, and a packing 16 is interposed between the pre-molded portion 14a and the cable insertion hole 1c of the case 1 so that the both are sealed. The pre-molded portion 14a
A cable bush 17 having a C-shaped cross section is attached to the cable bush 17. The cable bush 17 is detachably engaged with the tubular portion 1d of the case 1 so that the cable 14 is detachably fixed to the case 1. There is.

Now, on the inner surface of the inclined wall part 15 of the case 1, as shown in FIG. This support protrusion 18
Rises vertically from the bottom wall of the case 1 and the opening 1a
It has a support surface 18a facing the support surface 18a, a screw hole 18b is formed in the upper part of the support surface 18a, and an engaging projection 18c is provided in the lower part. Here, in FIG. 1, a clamp metal fitting 19 corresponding to a claw is provided on the inner bottom portion of the case 1. As shown in FIGS. 5 to 7, the clamp fitting 19 includes a base plate portion 19a, a mounting plate portion 19b vertically bent to the right end portion of the base plate portion 19a in FIG. 6, and a base plate portion 19a. It comprises a wedge-shaped claw portion 19c at the left end in FIG. As shown in FIG. 7, the mounting plate portion 19b is formed with a so-called dull-shaped through hole 19d having a small upper portion, a hole 19e is formed in the upper left portion of the drawing, and a lower hole is formed in the lower left portion of the drawing. A joint hole 19f is formed. Further, a rectangular notch 19g, which is continuous with the engaging hole 19f and is narrower than the inner diameter of the engaging hole 19f, is formed at the right end of the base plate portion 19a in FIG. When the clamp fitting 19 is mounted in the case 1, as shown in FIG. 4, the mounting plate portion 19b is aligned with the support surface 18a of the support projection 18 and the engagement hole 19f is formed in the engagement projection 18c. After fitting and temporarily fixing, in this state, insert the screw 20 into the small diameter upper part of the through-hole 19d of the polished type, and screw the screw 20 into the screw hole 18b of the support convex portion 18 to mount. The plate portion 19b is fixed to the support convex portion 18. In this case, by fitting the engagement hole 19f into the engagement protrusion 18c, the clamp fitting 19 is prevented from rotating when the screw 20 is turned. The clamp metal fitting 19 is arranged so that the board portion 19a is along the inner bottom surface of the case 1.

On the other hand, in the lower part of the device body 4, as shown in FIG. 1, an engaging recess 2 for engaging with the claw portion 19c of the clamp fitting 19 is provided.
1 is formed. Then, with the device body 4 housed in the case 1, the engagement recess 21 engages with the claw portion 19c of the clamp metal fitting 19, and thus the device body 4 is pulled out (to the left in FIG. 1). Movement is regulated. In this case, as shown in FIG. 8, since the engaging projections 18c of the supporting projections 18 are fitted in the engaging holes 19f of the mounting plate portion 19b of the clamp fitting 19, the engaging projections 18c are engaged with the upper portions of the engaging holes 19f. The deformation of the clamp fitting 19 is prevented by the contact of the fitting protrusion 18c. As a result, the device body 4 is prevented from coming off from the case 1 by the clamp metal fitting 19 without rattling. As shown in FIG. 1, a cover metal fitting 22 is attached to the upper portion of the device body 4, and the engaging metal piece 22 is cut and raised on the cover metal fitting 22.
22a is formed. By engaging the engagement piece 22a with the opening 1b on the upper surface of the case 1, the device body 4 is prevented from slipping off from the case 1 at the upper portion thereof.

Next, the operation of the above configuration will be described.

When removing the device main body 4 from the inside of the case 1, first, the engagement between the cable bush 17 and the tubular portion 1d of the case 1 is released, and the cable 14 is pulled outward to pull out the cable insertion hole of the case 1.
Pull out the premolded portion 14a of the cable 14 from inside 1c.
In this state, that is, in the state where only the core wire of the cable 14 is inserted into the cable insertion hole 1c, the removal tool shown in FIG.
23 is inserted into the cable insertion hole 1c, and the tip portion 23a of the tool 23 is inserted into the hole 19e of the mounting plate portion 19b of the clamp fitting 19. Then, by moving the tip portion 23a of the tool 23 upward, the clamp fitting 19 is moved upward. At this time, both side portions of the cutout portion 19g of the substrate portion 19a are elastically deformed,
The engagement protrusion 18c of the support protrusion 18 is disengaged from the notch 19g. As a result, the large diameter portion of the lower portion of the fully polished cable insertion hole 19d of the attachment plate portion 19b corresponds to the head portion of the screw 20. When the device body 4 is pulled out to the left in FIG. 1 in this state, the clamp metal fitting 19 has a screw 20 at the peripheral edge of the through hole 19d.
The device body 4 is dragged by the device body 4 in the same direction without being caught on the head of the device 1, and is disengaged from the support projection 18 of the case 1. still,
When the device body 4 is moved in the pull-out direction, the engaging piece 22a at the upper part of the device body 4 is deformed downward so that the engaging piece 22a engages with the opening 1b on the upper surface of the case 1. Is canceled in advance.

According to this embodiment having such a configuration, the clamp metal fitting 19 for restricting the movement of the device main body 4 in the pulling-out direction is placed in the case 1 at a position where it can be removed from the cable insertion hole 1c through which the cable 14 is inserted. Since it is provided, when removing the clamp fitting 19, the cable insertion hole 1c originally provided for inserting the cable 14 can be used. For this reason, it is not necessary to separately provide a through hole for removing the clamp metal fitting 19 in the case, and it is possible to suppress an increase in the number of sealing points, and thus to improve the waterproof performance.

FIG. 9 shows a second embodiment of the present invention. In FIG. 9, 24 is a case, and 24a is a cable insertion hole formed in this case 24.
A cable (not shown) is inserted into a. Reference numeral 25 denotes a support convex portion formed inside the case 24 so as to face the cable insertion hole 24a. A clamp metal fitting 26 is fixed to the support convex portion 25 with a screw 27. With this, the cable insertion hole
The screw 27 can be removed by a driver through 24a. And the claw portion of the clamp metal fitting 26
By engaging 26a with the device body, the movement of the device body in the pull-out direction is restricted. Therefore, also in the second embodiment, it is possible to obtain substantially the same effect as that of the first embodiment.

[Effects of the Invention] As is apparent from the above description, the present invention is provided such that the tool can be released from the fixing through the cable insertion hole with the premolded portion of the cable pulled out from the cable insertion hole to the outside. And a claw portion for restricting the movement of the device body in the removal direction by engaging with an engaging recess formed in the device body housed in the case and provided in the clamp metal fitting. Since it is configured to be provided, it has an excellent effect that it is possible to suppress the increase in the number of sealing portions of the case while the device body is configured to be removable from the case.

[Brief description of drawings]

1 to 8 show a first embodiment of the present invention. FIG. 1 is a vertical sectional view of the whole, FIG. 2 is an exploded side view of the whole, and FIG. 3 is a cutaway perspective view of a case. FIG. 4 is a cutaway perspective view showing a mounting state of the clamp metal fittings, FIG. 5 is a top view of the clamp metal fittings, FIG. 6 is a side view of the same, FIG. 7 is a rear view of the same, and FIG.
The figure is a vertical cross-sectional view showing the mounting state of the clamp fittings. FIG. 9 is a partial vertical sectional view showing a second embodiment of the present invention. In the drawing, 1,24 is a case, 1a is an opening, 1c and 24a are cable insertion holes, 4 is a device main body, 9 is packing, 14 is a cable, 14a is a premolded part, 16 is packing, and 18 and 25 are support. Projections, 19 and 26 are clamp fittings, 19c and 26a are claws, and 21 is an engaging recess.

Claims (1)

[Scope of utility model registration request] 1. An apparatus main body having a circuit board is housed in an inside of a case through an opening formed on one side of the case so that the circuit board is arranged in the case, and is led out from the circuit board of the apparatus main body. A cable insertion hole for inserting the cable is formed on the other side surface of the case where the opening is formed, and the opening is sealed by the device body through packing, and the cable is inserted. In a waterproof electric device configured to fit a pre-molded portion formed on the cable into the hole and seal the two by packing, fixedly attached to a portion in the case in the vicinity of the cable insertion hole, With the pre-molded portion of the cable pulled out from the cable insertion hole to the outside, with the case through the cable insertion hole with a tool Of the clamp body, which is provided so as to be able to release the fixing of the device body, and a direction in which the device body is pulled out by engaging with an engaging recess formed in the device body and housed in the case. A waterproof electric device, comprising: a claw portion that restricts movement of the electric device.