JPH09116281A - Cover fixing structure of control apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce external dimension as compared with the conventional control apparatus, by fixing a cover to a case, by an engaging means on one side of the cover and by a screw linkage means on the other side. SOLUTION: A cover 3 is fixed to a case 1 as follows; an engaging part 13 is engaged with an engaging hole 6 of a case side engaging part 5, in the upper part (one side) of the cover 3, and the lower part (the other side) is fixed to the case 1 by a screw part member 20. Thereby the external dimension can be reduced as compared with the conventional structure wherein a cover is fixed to the front aperture part of a case by fitting engaging pawl parts of the right and the left engaging parts of the cover to engaging hole parts of the case.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cover mounting structure for a control device such as a temperature controller.

[0002]

2. Description of the Related Art As shown in FIG. 7, a cover 40 in a conventional cover mounting structure for a control device has its left side,
An engaging piece portion 41 is provided on the right side, the engaging piece portion 41 is divided into two pieces, and an engaging claw portion 43 is provided at a tip end portion of each piece portion. Engagement holes 46 are formed on the left and right of the front opening 45 of the case 44 accommodating the control mechanism.

Then, the cover 40 is attached to the front opening 45 of the case 44 by engaging the engaging claw 43 at the tip of the engaging piece 41 with the engaging hole 46. The front opening 45 is closed.

[0004]

However, in the conventional cover mounting structure for a control device, the cover 40 is used.
However, the engaging piece portions 41 are provided on the left and right sides of the case 40, and the cover 40 engages the engaging claw portions 43 of the left and right engaging piece portions 41 with the engaging hole portions 46 to form the case 44. Since it is mounted in the front opening 45, there is a problem that the outer dimension L is increased by the left and right engaging piece portions 41 as shown in FIG. 7.

The present invention has been made in view of the above problems, and its purpose is to achieve control that contributes to reducing the external dimensions of the control device as compared with conventional control devices. It is to provide a cover mounting structure for a device.

[0006]

To achieve the above object, a cover mounting structure for a control device according to the invention of claim 1 is a control device for mounting a cover on an opening of a case accommodating a control mechanism part. In the cover mounting structure, the cover is fixed to the case by engaging means on one side and screw connecting means on the other side.

Therefore, since the cover is fixed to the case by the engaging means on one side and by the screw connecting means on the other side, the conventional cover engages the left and right engaging piece portions thereof. The external dimensions of the control device can be made smaller than those in which the claw portion is engaged with the engagement hole portion of the case and is attached to the front opening portion of the case.

In order to achieve the above object, a cover mounting structure for a control device according to a second aspect of the present invention is the cover mounting structure for a control device according to the first aspect, wherein the engaging means is the cover. An engaging piece portion having an engaging claw portion on the front side, a case side engaging portion having an engaging hole portion on the case side, and the engaging claw portion of the engaging piece portion It is configured to be engaged with the engagement hole.

Therefore, not only can the same effect as that of the above-mentioned invention of the first aspect be exerted, but in the engaging means, the engaging claw portion of the engaging piece portion is engaged with the engaging hole.

In order to achieve the above object, the cover mounting structure for a control device according to the invention of claim 3 is the cover mounting structure for a control device according to claim 1 or 2.
The screw connecting means fits a nut member holding portion provided on the case into a fitting concave portion of a screw holding portion provided on the cover, and fixes a screw member inserted into a screw insertion hole of the screw holding portion. The nut member is screwed into the nut member held by the nut member holding portion.

Therefore, not only can the same effects as those of the above-mentioned invention be achieved, but in the screw connecting means, the nut member provided in the case is provided in the fitting recess of the screw holding portion provided in the cover. The holding portion is fitted and the screw member inserted in the screw insertion hole of the screw holding portion is screwed into the nut member held by the nut member holding portion.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. 1 is an exploded perspective view of a control device having a cover mounting structure according to the present invention as seen from the front side, FIG. 2 is a front view for explaining the dimensions of the control device, and FIG. 3 is an exploded state of the control device. FIG. 4 is a cross-sectional view taken along the line AA of FIG.

A control device equipped with a cover mounting structure according to the present invention includes a case 1 having a control mechanism inside, a cover 3 for closing a front opening 2 of the case 1, and a waterproof seal shown in FIG. The material 4 is generally configured.

The case 1 has upper and lower surface portions 1A and 1B.
And left and right surface portions 1C and 1D, and the front and rear surfaces thereof are open. The peripheral edge of the front opening 2 of the case 1 is formed as a fitting convex portion 2A, and the receiving portion 2B is provided on the outer peripheral portion of the front opening 2 over the entire circumference. A case side engaging portion 5 is formed at the center of the upper portion of the receiving portion 2B. The case-side engaging portion 5 has the receiving portion 2B as a bottom surface, and the receiving portion 2B is integrally formed with a gate-shaped enclosure portion 2C, and the receiving portion 2 of the enclosure portion 2C is formed.
An engaging hole 6 is formed in a surface portion 2D facing B.

Further, a nut member holding portion 7 is formed in the center of the inner surface of the lower surface portion 1B of the case 1 so as to be closer to the front side, and a nut member 8 is attached to the nut member holding portion 7.

The cover 3 has a square-shaped cover body 9, and a skirt portion 10 is formed on the peripheral edge of the cover body 9 over substantially the entire circumference. The fitting wall 11 is formed on the inner surface of the skirt 10 so as to be located inside the skirt 10, and the groove between the skirt 10 and the fitting wall 11 accommodates the sealing material. The groove 12 is formed.

The skirt portion 10 is separated at the center of the upper portion 10A thereof, and an engaging piece portion 13 is provided between the end portions 10a and 10a of the skirt portion 10. The ribs 13 project from the outer surface portion of the skirt portion 10 to the outside by the amount of the ribs 14a provided on the outer surface portion 13b, and are located substantially in the same plane as the skirt portion 10. That is, the engagement piece 13 is
The base portion 13a is connected to the cover body 9, and the outer surface portion 13b has a rib 1 located in the middle portion and extending in the left-right direction.
4b and the engaging claw portion 15 located at the tip end portion are formed. Then, the case side engaging portion 5 and the engaging claw portion 15 constitute an engaging means.

Further, the lower portion 11B of the fitting wall portion 11
A screw holding portion 16 is provided at the center of the. The screw holding portion 16 has a fitting recess 17 into which the nut member holding portion 7 fits, and a screw insertion hole 18 extends from the surface portion of the cover body 9 to the end surface portion of the fitting recess 17. Is formed. In addition, the upper and lower parts 1 of the fitting wall portion 11
Substrate holding ribs 19 for holding a substrate of the control mechanism portion (neither shown) are integrally formed on 1A and 11B.

Further, the control mechanism portion is accommodated in the case 1 while being held by the substrate holding ribs 19, and the waterproof seal material 4 is accommodated in the seal material accommodating groove portion 12 of the cover 3. The front opening 2 of the case 1 is closed by a cover 3.

That is, the fitting wall portion 11 is fitted to the inner surface side of the front opening 2 of the case 1, the fitting convex portion 2A of the case 1 is inserted into the sealing material accommodating groove portion 12, and this fitting is performed. The convex portion 2A compresses the waterproof sealing material 4, and the engagement piece portion 13 is inserted into the case side engagement portion 5 on the upper side of the cover 3, and the tip portion of the engagement piece portion 13 is inserted. Engaging claw 1
5 is engaged with the engagement hole 6. On the lower side of the cover 3, the nut member holding portion 7 is fitted in the fitting recess 17 of the screw holding portion 16, and the screw member 20 inserted into the screw insertion hole 18 is the nut member holding portion. It is screwed to the nut member 8 held by 7. The screw member 20, the screw holding portion 16, and the nut member 8 constitute a screw connecting means.

Therefore, the cover 3 engages the engaging piece portion 13 with the engaging hole portion 6 of the case side engaging portion 5 at the upper portion (one side) and the screw at the lower portion (other side). In order to have a structure in which each member 20 is fixed to the case 1, the conventional cover 40 engages the engaging claw portions 43 of the left and right engaging piece portions 41 with the engaging hole portions 46 of the case 44. As shown in FIG. 2, the outer dimension L ′ (<L) is smaller than that of the case 44 mounted on the front opening 45 of the case 44.

[0022]

As described above, according to the cover mounting structure according to the invention of claim 1, in the cover mounting structure of the control device for mounting the cover on the opening of the case accommodating the control mechanism, Since the cover is fixed to the case by the engaging means on one side and by the screw connecting means on the other side, the conventional cover has the engaging claw portions of the left and right engaging piece portions of the cover. The external dimensions of the control device can be made smaller than those of the control device which is engaged with and attached to the front opening of the case.

A cover mounting structure for a control device according to a second aspect of the present invention is the cover mounting structure for a control device according to the first aspect, wherein the engaging means is engaged with the cover at a front engaging claw portion. And a case-side engaging portion having an engaging hole portion on the case side, and the engaging claw portion of the engaging piece portion is engaged with the engaging hole. According to the present invention, not only can the same effect as that of the invention of claim 1 described above be exhibited, but in the engaging means, the engaging claw portion of the engaging piece portion is engaged with the engaging hole. , The cover can be fixed to the case.

A cover mounting structure for a control device according to a third aspect of the present invention is the cover mounting structure for a control device according to the first or second aspect, wherein the screw connecting means holds a screw provided on the cover. The nut member holding portion provided on the case is fitted into the fitting concave portion of the portion, and the screw member inserted into the screw insertion hole of the screw holding portion is screwed into the nut member held in the nut member holding portion. With the combined structure, not only the same operation as the invention of the above-mentioned claim 1 can be achieved, but in the screw connecting means, it is provided in the case at the fitting recess of the screw holding portion provided in the cover. The cover is fixed to the case by fitting the nut member holding portion and screwing the screw member inserted into the screw insertion hole of the screw holding portion into the nut member held by the nut member holding portion. This Can.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a control device provided with a cover mounting structure according to the present invention as seen from the front side.

FIG. 2 is a front view for explaining the dimensions of the control device.

FIG. 3 is a plan view of the control device in an exploded state.

4 is a sectional view taken along the line AA of FIG.

FIG. 5 is a plan view of a cover.

FIG. 6 is a plan view of a case.

FIG. 7 is an exploded perspective view of a control device having a conventional cover mounting structure as seen from the front side.

[Explanation of symbols]

 1 Case 2 Front Opening 3 Cover 6 Engagement Hole 8 Nut Member 15 Engaging Claw 20 Screw Member

Claims (3)

[Claims] 1. A cover attachment structure for a control device, wherein a cover is attached to an opening of a case accommodating a control mechanism portion, wherein the cover is provided on one side thereof with an engagement means.
A cover mounting structure for a control device, characterized in that the other side is fixed to a case by a screw connecting means. 2. The engagement means, wherein the cover is provided with an engagement piece portion having an engagement claw portion on a front side, and a case side engagement portion having an engagement hole portion on the case side, The cover mounting structure for a control device according to claim 1, wherein the engaging claw portion of the engaging piece portion is configured to engage with the engaging hole. 3. The screw connecting means fits a nut member holding portion provided on the case into a fitting concave portion of a screw holding portion provided on the cover, and inserts the nut member holding portion into a screw insertion hole of the screw holding portion. 3. The cover mounting structure for a control device according to claim 1, wherein the screw member is screwed onto the nut member held by the nut member holding portion.