JPH0729666Y2 - Cover mounting structure for electrical equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a structure for attaching a cover to an opening for display, setting, etc. of a main body case constituting an electric device such as a distance sensor.

[Conventional technology]

 FIG. 4 shows a conventional example of this type of cover mounting structure.

That is, in the opening 11 of the main body case 10 that constitutes the electric device,
A cover 20 having a shape corresponding to that is fitted, and the foot 22 having the hole 21 is engaged with the protrusion 12 provided on the inner surface of the main body case 10 to attach the cover 20 to the main body case 10.

[Problems to be solved by the device]

However, with the structure as described above, when the cover 20 is attached or detached, the legs 22 of the cover 20 must be clamped or the entrance of the opening 11 of the main body case 10 must be expanded. Therefore, there is a problem that it is not easy to attach and detach the cover 20.

Moreover, at that time, too much force is applied and the cover 20 and the main body case 1
There is also a risk that 0 or the pieces and the like provided on them may be damaged.

Further, even if it is desired to make a waterproof structure between the opening 11 of the main body case 10 and the cover 20, there is a problem that it is difficult to make the waterproof structure because the projections 12 and the feet 22 are in the way.

In view of this, the present invention has improved these points, and the cover can be easily attached and detached, and at the same time, there is no risk of damaging the main body case, the cover, etc., and a cover for an electric device that can be easily waterproofed. Its main purpose is to provide a mounting structure.

[Means for Solving the Problems]

In order to achieve the above object, the cover mounting structure of the present invention is provided with two arcuate tongues at one end of the cover so as to project outward from the peripheral edge of the cover in a plan view. A U-shaped projecting piece having elasticity at its end portion, which has a projection on its outer surface portion, is provided so as to project outward from the peripheral portion of the cover in plan view, and Two arc-shaped first recesses, into which the tongues of the cover fit, are provided on one side, and are opened on the respective side surfaces, and the projecting piece of the cover is provided on the other side of the opening. Is provided with a hole having a hole that engages with the projection of the projecting piece, and is provided around the opening of the main body case, the first recess and the second recess.
An annular packing sandwiched between the main body case and the peripheral portion of the cover is provided inside the recess of the main body case, and each of the tongue pieces and the protruding piece of the cover are provided in the corresponding first case of the main body case.
And the cover is attached to the main body case by being fitted in the second concave portion and the main body case and the cover are sealed with the packing.

[Action]

According to the above structure, when the cover is attached to the main body case, the tongue piece of the cover is fitted into the corresponding concave portion of the main body case, and the cover is rotated and pressed against the main body case side by using that as a fulcrum to push the protruding piece. It suffices to fit it into the corresponding recess of the case. Then, the elasticity of the U-shaped projecting piece engages the projection with the hole on the body case side, and the cover cannot be removed.

Further, when removing the cover from the main body case, the U-shaped protruding piece of the cover may be pressed down to disengage the protrusion from the hole on the main body case side, and the cover may be rotated in the opposite direction to the above. .

〔Example〕

FIG. 1 is a sectional view showing an example of a cover mounting structure according to the present invention. FIG. 2 is a plan view of the cover shown in FIG. FIG. 3 is a plan view of the main body case in FIG.

The main body case 30 is for accommodating an electric circuit in, for example, a distance sensor, and has an opening 31 for display and the like on its front surface (upper surface in FIG. 1).

The cover 40 is for covering the opening 31, and is made of a transparent material for display, for example.

In this example, two tongue pieces 42 having an arc shape are provided at one end of the cover 40, and a U-shaped protruding piece 43 having elasticity is provided at the other end. Moreover, the protrusion 44 is provided on the outer surface of the protruding piece 43. As shown in FIGS. 1 and 2, the tongue piece 42 and the projecting piece 43 project outward from the peripheral edge portion 41 of the cover 40 in plan view.

On the other hand, on the main body case 30 side, two first concave portions 32 in the shape of an arc into which the tongues 42 of the cover 40 are respectively fitted are formed on one side of the opening 31 and the cover 40 is formed on the other side. Protruding piece 43
The second concave portions 33 into which are fitted are respectively provided. Moreover, the side surface of the recess 33 has a hole for engaging with the protrusion 44 of the cover 40.
34 are provided.

It should be noted that each of the recesses 32 is preferably opened laterally as shown in FIG. By doing so, even when the main body case 30 is formed by molding, the arc-shaped recess 32 can be formed without any trouble by making the mold open laterally as shown by the arrow C. Because.

According to the above structure, when the cover 40 is attached to the main body case 30, each tongue piece 42 of the cover 40 is erected in the corresponding concave portion of the main body case 30 in a state where the cover 40 is erected as shown by a two-dot chain line in FIG.
Fit into each 32, and cover using that as a fulcrum
It suffices to rotate 40 as shown by arrow A and press it toward the main body case 30 to fit the protruding piece 43 into the corresponding recessed portion 33 of the main body case 30, and by doing so, the elasticity of the U-shaped protruding piece 43 The protrusion 44 and the hole 34 on the body case 30 side are engaged with each other, and the cover 40 cannot be removed.

When removing the cover 40 from the main body case 30, the U-shaped protruding piece 43 of the cover 40 is pressed and narrowed as shown by the arrow B to disengage the protrusion 44 from the hole 34 on the main body case 30 side. Further, the cover 40 may be rotated in the direction opposite to the arrow A, whereby the cover 40 can be removed.

Thus, according to the above structure, the arc-shaped tongue piece of the cover 40 is formed.
Since the portion of 42 serves as a fulcrum and the portion of the U-shaped protruding piece 43 on the opposite side can engage with and disengage from the main body case 30 side, it is very easy to attach / detach the cover 40 to / from the main body case 30. become.

Further, since the protruding piece 43 is U-shaped, its elasticity is great, and it can be pressed more than necessary (that is, only until the U-shaped inner surfaces come into contact with each other). At this time, there is no fear that the protruding piece 43 will be damaged.
Of course, there is no possibility that the main body case 30, the cover 40, and other parts provided on them will be damaged.

Even when a waterproof structure is provided between the opening 31 of the main body case 30 and the cover 40, the tongue piece 42 and the protruding piece 43 of the cover 40,
Alternatively, since the recesses 32 and 33 of the main body case 30 do not interfere with the recesses, the waterproof structure can be easily achieved.

This embodiment is an example of such a waterproof structure, in which an annular packing groove 35 is provided around the opening 31 of the main body case 30, an annular packing 50 is put therein, and this is covered with a cover 40.
I put it between As a result, the opening 31 of the main body case 30 and the cover 40 are hermetically sealed to form a waterproof structure.

It is preferable that the packing groove 35 is provided in terms of waterproof performance, but it is not essential.

Further, the above structure can be widely applied to the case where the cover is attached to the opening for display and setting of the main body case that constitutes the electric device other than the distance sensor.

[Effect of device]

Since the present invention is configured as described above, it has the following effects.

Since the arc-shaped tongue of the cover serves as a fulcrum, the U-shaped protruding piece on the opposite side can be engaged with and disengaged from the body case side, so that the cover can be easily attached to and detached from the body case. Become. In addition, there is no risk of damaging the main body case, the cover, and the parts provided on them when attaching and detaching them.

Since the tongue piece and the projecting piece of the cover are provided so as to project outward from the peripheral portion of the cover in a plan view,
Correspondingly, the first and second recesses of the main body case are also located outside the peripheral edge of the cover, and therefore the first and second recesses around the opening of the main body case.
Using the packing provided inside the concave portion of the cover, the tongue piece and the protruding piece of the cover, and the first and second pieces of the main body case.
The main body case and the cover can be hermetically sealed without being disturbed by the recessed portion, and thus a waterproof structure can be easily realized.

Since the tongue of the cover and the first recess of the main body case into which the cover is fitted are both arcuate, it is possible to make the rattling in the front-rear direction and the up-down direction in the engaging portion of both very small. As a result, the positional displacement of the cover in the front-back direction and the vertical direction can be made extremely small, so that the main body case and the cover can be reliably sealed through the packing, and the reliability of waterproofing is high. .

Two tongues of the cover and the first recesses of the main body case in which the tongues are fitted are provided, and the displacement of the cover to the left and right is caused by the side surface of the tongue of the cover and the side surface of the first recessed portion of the main body case. Since they are stopped by abutting each other, it is possible to make the lateral displacement of the cover extremely small. Therefore, also from this point of view, the sealing between the main body case and the cover is ensured via the packing. Can be done, waterproof and reliable.

Since the two first recesses of the main body case are open to the side surface, respectively, even when the main body case is formed by molding, the mold can be opened and pulled out laterally, and thus the first recess having an arc shape is formed. Can be formed without any trouble.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of a cover mounting structure according to the present invention. FIG. 2 is a plan view of the cover shown in FIG. FIG. 3 is a plan view of the main body case in FIG. FIG. 4 is a perspective view showing an example of a conventional cover mounting structure. 30 ... Body case, 31 ... Opening part, 32, 33 ... Recessed part, 34 ... Hole, 4
0 ... Cover, 42 ... Tongue piece, 43 ... Projecting piece, 44 ... Projection, 50 ... Packing.

Claims (1)

[Scope of utility model registration request] 1. A structure in which a cover, which is slightly larger than the opening and covers the opening, is attached to an opening of a main body case that constitutes an electric device, and two arc-shaped parts are provided at one end of the cover. A tongue piece is provided so as to project outward from the peripheral edge of the cover in a plan view, and a projecting piece having U-shaped elasticity at the other end of the cover and having a projection on its outer surface is covered. The two first concave portions having an arc shape, which are provided so as to project outwardly in a plan view from the peripheral edge portion of, and each tongue piece of the cover is fitted to one side portion of the opening portion of the main body case. There is an open one on each side, and a second concave portion into which the protruding piece of the cover fits on the other side portion of the opening, and a hole for engaging with the protrusion of the protruding piece is formed on the side surface portion. And the surrounding area of the opening of the body case. An annular packing that is sandwiched between the main body case and the peripheral portion of the cover is provided inside the first and second recesses, and the tongue pieces and the protruding pieces of the cover correspond to the first and second corresponding ones of the main body case. A cover mounting structure for an electric device, characterized in that the cover is attached to the main body case by being fitted into the second recesses, respectively, and the space between the main body case and the cover is sealed by using the packing.