Misoperation prevention cover

Abstract

To prevent a cover from having excessive toughness and to prevent the cover itself from becoming large.SOLUTION: A misoperation prevention cover includes a base 20 which is attached to a panel 1 together with a switch body 2b and exposes an operating portion 2a provided on the switch body 2b from an opening 21a, and a lid body 30 that engages with the base 20 via engagement means and opens and closes the opening 21a, the engagement means includes shaft portions 321, 322 formed on the lid body 30, bearing portions 221, 231 formed on the base 20 and which hold the shaft portions 321, 322 rotatably when they enter, and groove portions 222, 232 which are formed in a manner communicating with the bearing portions 221, 231 and allow the shaft portions 321, 322 to pass through only when the swing angle in the direction of opening the opening 21a of the lid body 30 becomes a predetermined angle, and when the base 20 is attached to the panel 1, the swing angle of the lid body 30 in the direction of opening the opening 21a is restricted to less than the predetermined angle.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to an erroneous operation prevention cover, and more particularly to an erroneous operation prevention cover for preventing erroneous operation of an operating portion of an operating switch mounted on a panel such as a control board. [Background technology]

[0002] Conventionally, an erroneous operation prevention cover includes a base and a lid. The base is attached to a panel together with a switch body of an operating switch, and an operating part provided on the switch body is exposed from an opening formed in the base. The lid is provided so as to be swingable relative to the base in a manner that opens and closes the opening by inserting and fitting an axis part formed on the lid into an axis hole formed in the base. In such an erroneous operation prevention cover, the lid swings in a direction that closes the opening in a normal state, thereby preventing erroneous operation of the operating part (for example, see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 3057954 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned erroneous operation prevention cover, the shaft portion formed on the cover is inserted into the shaft hole formed in the base and fitted thereto, so it is necessary to elastically deform the portion where the shaft portion is formed (shaft portion forming portion) or the portion where the shaft hole is formed (shaft hole forming portion) in order to insert the shaft portion into the shaft hole. Therefore, the shaft portion forming portion or the shaft hole forming portion is required to have strength that is greater than necessary, or is required to have dimensions that are greater than necessary in consideration of elastic deformation, which may result in excessive toughness and an increase in the size of the cover itself.

[0005] In view of the above-mentioned circumstances, the present invention aims to provide an erroneous operation prevention cover that can prevent excessive toughness and that can prevent the cover itself from becoming large. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the misoperation prevention cover of the present invention comprises a base that is attached to a panel together with a switch body and exposes an operating part provided on the switch body through an opening formed in the base, and a lid body that engages with the base via an engagement means and is arranged to be swingable in a manner to open and close the opening, and the lid body closes the opening, thereby preventing erroneous operation of the operating part, and the engagement means comprises an axis portion formed on one of the base and the lid body, a bearing portion formed on the other of the base and the lid body and that rotatably holds the axis portion when the axis portion enters, and a groove portion formed in a manner communicating with the bearing portion and that allows the axis portion to pass only when the swing angle in the direction of opening the opening of the lid body is a predetermined angle, and the lid body is characterized in that the swing angle in the direction of opening the opening is restricted to less than the predetermined angle when the base is attached to the panel.

[0007] The present invention is also characterized in that the above-mentioned erroneous operation prevention cover further comprises a biasing means interposed between the base and the lid body and biasing the lid body in a manner that causes it to swing in a direction that closes the opening.

[0008] Furthermore, in the above-mentioned erroneous operation prevention cover according to the present invention, the shaft portion is formed on the lid body, and the bearing portion is formed on the base.

[0009] The present invention is also characterized in that, in the above-mentioned misoperation prevention cover, the shaft portion comprises a first shaft portion having a cylindrical shape and a first planar notch formed in a portion along its central axis, and a second shaft portion having a cylindrical shape and a second notch formed along its central axis in a portion opposite the first shaft portion. Effect of the Invention

[0010] According to the present invention, the engaging means for engaging the base and the lid includes an axis formed on one of the base and the lid, a bearing formed on the other of the base and the lid, which holds the axis rotatably when the axis enters, and a groove formed in a manner communicating with the bearing and allowing the axis to pass only when the swing angle in the direction of opening the opening of the lid is a predetermined angle. When the base is attached to the panel, the swing angle of the lid in the direction of opening the opening is restricted to less than the predetermined angle, so that there is no need to elastically deform the part where the axis is formed, the bearing, and the groove. This not only eliminates the need to enlarge the dimensions of these parts, but also eliminates the need for excessive toughness in the base and the lid. This has the effect of preventing the cover from having excessive toughness and preventing the cover itself from becoming large. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a perspective view showing an application example of an erroneous operation prevention cover according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a perspective view showing an application example of the erroneous operation prevention cover according to the embodiment of the present invention. [Diagram 3] FIG. 3 is a perspective view showing the external configuration of the erroneous operation prevention cover according to the embodiment of the present invention. [Figure 4] FIG. 4 is a perspective view showing an external configuration of the base shown in FIG. [Diagram 5] FIG. 5 is a perspective view showing an external configuration of the base shown in FIG. [Figure 6] FIG. 6 is an enlarged perspective view showing a main part of the base shown in FIGS. [Figure 7] FIG. 7 is a perspective view showing the external configuration of the lid shown in FIG. [Figure 8] FIG. 8 is a perspective view showing the external configuration of the lid shown in FIG. [Figure 9]FIG. 9 is an enlarged perspective view showing a main part of the cover shown in FIGS. [Figure 10] FIG. 10 is an explanatory diagram showing a procedure for engaging the lid with the base. [Figure 11] FIG. 11 is an explanatory diagram for explaining the engagement state between the base and the lid body, where (a) is a plan view of the misoperation prevention cover with the lid body blocking the opening, and (b) shows the PP cross section and the QQ cross section in (a) when the swing angle of the lid body is 0°, 90°, and 270°. [Figure 12] FIG. 12 is an exploded perspective view of the application example shown in FIGS. [Figure 13] FIG. 13 is a perspective view showing an application example of the erroneous operation prevention cover according to the embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the erroneous operation prevention cover according to the present invention will be described in detail below with reference to the accompanying drawings.

[0013] 1 and 2 are perspective views showing application examples of an erroneous operation prevention cover according to an embodiment of the present invention.

[0014] The erroneous operation prevention cover 10 illustrated here is for preventing erroneous operation of an operation section 2a of an operation switch 2 such as a push button switch mounted on a panel 1 such as a control board. The configuration of the erroneous operation prevention cover 10 will be described below along the directions shown in Figs. 1 and 2.

[0015] 3 is a perspective view showing the external configuration of the erroneous operation prevention cover 10 according to the embodiment of the present invention. The erroneous operation prevention cover 10 shown here includes a base 20, a lid body 30, and a coil spring (urging means) 40.

[0016] Figures 4 and 5 are perspective views showing the external configuration of the base 20 shown in Figure 3. As shown in Figures 4 and 5, the base 20 is made of, for example, a resin material, and includes a base base 21, a first base protrusion 22, and a second base protrusion 23.

[0017] The base base 21 is a substantially annular plate-like portion having a circular opening 21a. The first base protrusions 22 are a pair of left and right protruding rearward from the rear end portion of the base base 21. A first bearing portion 221 and a first groove portion 222 are formed in each of the first base protrusions 22. In the following description, the sides of the pair of left and right first base protrusions 22 that are close to each other will be referred to as the inner side, and the sides that are separated from each other will be referred to as the outer side.

[0018] The first bearing portion 221 is a circular hole portion formed in a manner exposed on the inner side of the first base protrusion 22. The first groove portion 222 is a slit-shaped portion that communicates with the first bearing portion 221 and extends downward from the first bearing portion 221 and has a uniform width dimension. The first groove portion 222 is exposed on the inner side of the first base protrusion 22 and is exposed at the lower end of the first base protrusion 22. As shown in FIG. 6, the width dimension A of the first groove portions 222 in the front-rear direction is smaller than the inner diameter of the first bearing portion 221, and the first groove portions 222 are formed biased toward the front side with respect to the first bearing portion 221.

[0019] The second base protrusions 23 are a pair of left and right second base protrusions 23 formed between the first base protrusions 22 in a manner to protrude rearward from the rear end portion of the base base 21. Each of the second base protrusions 23 is formed with a second bearing portion 231 and a second groove portion 232.

[0020] The second bearing portions 231 are circular hole portions formed in a manner that exposes the outer side of the second base protrusion 23, i.e., the side portion facing the inner side of the first base protrusion 22. The second bearing portions 231 have the same inner diameter as the first bearing portion 221 while having the same central axis as the first bearing portion 221, and each face the first bearing portion 221. In other words, the second bearing portion 231 formed in the left second base protrusion 23 faces the first bearing portion 221 formed in the left first base protrusion 22, and the second bearing portion 231 formed in the right second base protrusion 23 faces the first bearing portion 221 formed in the right first base protrusion 22.

[0021] The second groove portion 232 is in communication with the second bearing portion 231, and is a slit-shaped portion having a uniform width extending downward from the second bearing portion 231. The second groove portion 232 is exposed to the outer side of the second base protrusion 23, and is exposed to the lower end of the second base protrusion 23. The width dimension of these second groove portions 232 in the front-rear direction is the same as the width dimension A of the first groove portion 222. Furthermore, the width dimension of the second groove portion 232 in the front-rear direction is smaller than the inner diameter of the second bearing portion 231, and the second groove portion 232 is formed offset toward the rear side with respect to the second bearing portion 231.

[0022] As a result, the second groove portion 232 formed in the left second base protrusion 23 partially faces the first groove portion 222 formed in the left first base protrusion 22, and the second groove portion 232 formed in the right second base protrusion 23 partially faces the first groove portion 222 formed in the right first base protrusion 22.

[0023] Fig. 7 and Fig. 8 are perspective views showing the external configuration of the lid body 30 shown in Fig. 3. As shown in Fig. 7 and Fig. 8, the lid body 30 is formed of, for example, a resin material, and includes a lid base 31 and a lid protrusion 32.

[0024] The lid base 31 is a generally circular portion whose outer diameter is generally equal to that of the base base 21. The lid base 31 bulges upward in Figures 7 and 8, with its upper surface being the front surface 31a and its lower surface being the back surface 31b (see Figure 2). In other words, the lid base 31 is large enough to close the opening 21a formed in the base base 21.

[0025] The lid protrusions 32 are a pair of left and right lid protrusions formed in a manner to protrude rearward from the rear end portion of the lid base 31. In the following description, the sides of the pair of left and right lid protrusions 32 that are close to each other will be referred to as the inner side, and the sides that are separated from each other will be referred to as the outer side.

[0026] Here, the separation distance between the lid protrusions 32 is greater than the left-right width defined by the second base protrusion 23 and is smaller than the distance between the first base protrusions 22. More specifically, when the left lid protrusion 32 enters between the left first base protrusion 22 and the left second base protrusion 23, the right lid protrusion 32 is formed at a distance such that it can enter between the right first base protrusion 22 and the right second base protrusion 23.

[0027] Each of such cover projections 32 is formed with a first shaft portion 321 and a second shaft portion 322. The first shaft portion 321 is formed so as to protrude outward from the outer side of the cover projection 32. That is, the first shaft portion 321 formed on the left cover projection 32 is formed so as to protrude leftward from the left side portion, and the first shaft portion 321 formed on the right cover projection 32 is formed so as to protrude rightward from the right side portion. These first shaft portions 321 are cylindrical in shape with a planar first notch 321a formed along the central axis of the first shaft portion 321 in the lower portion in Figs. 7 and 8.

[0028] The second shaft portion 322 is formed so as to protrude inward from the inner portion of the lid projection 32 with the central axis coinciding with the first shaft portion 321. That is, the second shaft portion 322 formed on the left lid projection 32 is formed so as to protrude rightward from the right side, and the second shaft portion 322 formed on the right lid projection 32 is formed so as to protrude leftward from the left side. These second shaft portions 322 are cylindrical in shape with a planar second notch 322a formed along the central axis in the portion opposite to the first shaft portion 321, i.e., in the upper portion in Figures 7 and 8.

[0029] 9, the first shaft portion 321 and the second shaft portion 322 have the same dimensions such that the width dimension B perpendicular to the notch (first notch 321a or second notch 322a) and the maximum outer diameter dimension D are the same. Furthermore, the first shaft portion 321 and the second shaft portion 322 have a width dimension B smaller than the width dimension A of the first groove portion 222 and the second groove portion 232, and a maximum outer diameter dimension D slightly smaller than the inner diameter of the first bearing portion 221 and the second bearing portion 231.

[0030] The lid body 30 having such a configuration is engaged with the base 20 as follows. As shown in FIG. 10(a), the lid body 30 is arranged so that the front surface 31a faces the front and the back surface 31b faces the rear, so that the first notch 321a faces the rear side and the second notch 322a faces the front side. Then, the lid body 30 is brought close to the base 20 arranged along the front-rear direction from below. As described above, in the base 20, the first groove portion 222 is formed to be biased toward the front from the first bearing portion 221, and the second groove portion 232 is formed to be biased toward the rear from the second bearing portion 231. Therefore, the first shaft portion 321 passes through the first groove portion 222 from below to above, and the second shaft portion 322 passes through the second groove portion 232 from below to above.

[0031] Thereafter, as shown in (b) of Fig. 10, the first shaft portion 321 is inserted into the first bearing portion 221, and the second shaft portion 322 is inserted into the second bearing portion 231, so that the lid body 30 can swing about the central axis of the first shaft portion 321 and the second shaft portion 322. Then, as shown in (c) of Fig. 10, the lid body 30 is swung so that the back surface 31b of the lid body 30 approaches the upper side of the opening 21a of the base 20, whereby the lid body 30 is engaged with the base 20. That is, the lid body 30 is engaged with the base 20 so as to be capable of swinging in a manner that opens and closes the opening 21a.

[0032] 3, the coil spring 40 is held so as to span the holding protrusion 233 formed on the inner side of the second base protrusion 23 of the base 20, with one end 41 engaged with the base 20 and the other end 42 engaged with the lid body 30. This coil spring 40 biases the lid body 30 in a direction to close the opening 21a. In other words, the coil spring 40 is interposed between the base 20 and the lid body 30, and biases the lid body 30 in a manner that causes it to swing in a direction to close the opening 21a.

[0033] The engagement state between the base 20 and the lid body 30 in the erroneous operation prevention cover 10 will be described.

[0034] 11 is an explanatory diagram for explaining the engagement state between the base 20 and the lid body 30, where (a) is a plan view of the erroneous operation prevention cover 10 in a state in which the lid body 30 closes the opening 21a, and (b) shows the PP section and the QQ section in (a) when the swing angle of the lid body 30 is 0°, 90°, and 270°. Note that the coil spring 40 is not shown in FIG.

[0035] As shown in FIG. 11, when the cover body 30 blocks the opening 21a, i.e., when the swing angle of the cover body 30 is 0°, the front-to-rear dimension of the first shaft portion 321 and the second shaft portion 322 becomes the maximum outer diameter dimension D, and they are engaged with the first bearing portion 221 and the second bearing portion 231, thereby restricting them from passing through the first groove portion 222 and the second groove portion 232.

[0036] Furthermore, when the swing angle of the cover body 30 becomes 90°, i.e., when the cover body 30 swings 90° in the direction of opening the opening 21a, the front-to-rear dimension of the first shaft portion 321 and the second shaft portion 322 becomes the width dimension B, but since the first shaft portion 321 engages with the rear portion of the first bearing portion 221 and the second shaft portion 322 engages with the front portion of the second bearing portion 231, the first shaft portion 321 and the second shaft portion 322 are restricted from passing through the first groove portion 222 and the second groove portion 232, respectively.

[0037] On the other hand, when the swing angle of the cover body 30 is 270°, i.e., when the cover body 30 swings 270° in the direction of opening the opening 21a, the front-to-rear dimension of the first shaft portion 321 and the second shaft portion 322 becomes width dimension B, and by positioning the first shaft portion 321 directly above the first groove portion 222 in the first bearing portion 221 and positioning the second shaft portion 322 directly above the second groove portion 232 in the second bearing portion 231, the first shaft portion 321 is allowed to pass through the first groove portion 222 and the second shaft portion 322 is allowed to pass through the second groove portion 232.

[0038] That is, in the erroneous operation prevention cover 10, when the swing angle of the lid body 30 is equal to or greater than 0° and less than 270°, the engaged state between the base 20 and the lid body 30 is maintained. The grooves (first groove 222 and second groove 232) of the base 20 allow the shafts (first shaft 321 and second shaft 322) to pass through only when the lid body 30 swings a predetermined angle (270°) in the direction to open the opening 21a.

[0039] Such an erroneous operation prevention cover 10 is attached to the panel 1 as shown in Fig. 1 and Fig. 2 in the following manner. As shown in Fig. 12, the base 20 is arranged so that its opening 21a coincides with the mounting hole 1a formed in the panel 1 via a ring-shaped packing 3 for ensuring waterproofing. Then, the switch body 2b constituting the operation switch 2 is relatively passed through the opening 21a and the mounting hole 1a in this order, and then passed through the support hole 4a formed in the press fitting 4 as shown in Fig. 13, and then screwed into the nut 5. As a result, the switch body 2b is attached to the panel 1 with the operation part 2a for pressing operation provided on the switch body 2b exposed from the opening 21a of the base 20 as shown in Fig. 2, and as a result, the erroneous operation prevention cover 10 is attached to the panel 1.

[0040] The anti-misoperation cover 10 is configured so that the lid body 30 swings in a direction that blocks the opening 21a of the base 20 due to the biasing force of the coil spring 40, so that in the normal state, the lid body 30 covers the operating unit 2a as shown in FIG. 1, thereby preventing erroneous operation of the operating unit 2a.

[0041] On the other hand, when the lid body 30 is swung in a direction to open the opening 21a against the biasing force of the coil spring 40 as shown in FIG. 2, the misoperation prevention cover 10 exposes the operating portion 2a and allows the operating portion 2a to be pressed.

[0042] In addition, in the above-mentioned erroneous operation prevention cover 10, the base 20 is attached to the panel 1, so that the swing angle of the lid 30 (the swing angle in the direction to open the opening 21a) is 0° or more and 180° or less. In other words, when the base 20 is attached to the panel 1, the swing angle of the lid 30 in the direction to open the opening 21a is restricted to less than a predetermined angle (270°). This prevents the lid 30 from coming off the base 20 during normal use.

[0043] As described above, in the misoperation prevention cover 10 which is an embodiment of the present invention, the first shaft portion 321 and the second shaft portion 322 formed on the lid body 30, the first bearing portion 221 and the second bearing portion 231 formed on the base 20 and which hold the first shaft portion 321 and the second shaft portion 322 rotatably when they enter, and the first groove portion 222 and the second groove portion 232 formed in a manner communicating with the first bearing portion 221 and the second bearing portion 231 respectively and which allow the first shaft portion 321 and the second shaft portion 322 to pass through only when the swing angle in the direction opening the opening 21a of the lid body 30 becomes a predetermined angle (270°), constitute the engagement means in the present invention.

[0044] According to the above-mentioned erroneous operation prevention cover 10, the first groove 222 and the second groove 232 constituting the engagement means allow the first shaft 321 and the second shaft 322 to pass through only when the swing angle in the direction to open the opening 21a of the lid body 30 is a predetermined angle (270°), and the swing angle of the lid body 30 constituting the engagement means in the direction to open the opening 21a is restricted to less than the predetermined angle (270°) when the base 20 is attached to the panel 1, so that it is not necessary to elastically deform the first base protrusion 22, the second base protrusion 23, and the lid protrusion 32 which are the shaft forming portion and the bearing forming portion, and not only is it not necessary to increase the dimensions of the first base protrusion 22, the second base protrusion 23, and the lid protrusion 32, but the base 20 and the lid body 30 do not require excessive toughness. Therefore, it is possible to suppress the cover from having excessive toughness and to suppress the cover itself from becoming large.

[0045] Although the preferred embodiment of the present invention has been described above, the present invention is not limited to this and various modifications can be made.

[0046] In the above-described embodiment, the shaft portion (first shaft portion 321 and second shaft portion 322) was formed in the cover body 30, and the bearing portion (first bearing portion 221 and second bearing portion 231) and the groove portion (first groove portion 222 and second groove portion 232) were formed in the base 20, but in the present invention, the shaft portion may be formed in the base, and the bearing portion and the groove portion may be formed in the cover body.

[0047] In the above-described embodiment, the swing angle of the lid body 30 at which the first shaft portion 321 and the second shaft portion 322 can pass through the first groove portion 222 and the second groove portion 232 is 270°, but in the present invention, this is not limited to 270°.

[0048] In the above-described embodiment, the first groove 222 and the second groove 232 are slit-shaped portions with a uniform width, but in the present invention, the grooves may be formed so that their widths gradually increase with increasing distance from the bearing. This makes it easier to insert the shaft into the groove when engaging the lid with the base, and simplifies the assembly work of the erroneous operation prevention cover. [Explanation of symbols]

[0049] 1...panel, 1a...mounting hole, 2...operation switch, 2a...operation portion, 2b...switch body, 10...misoperation prevention cover, 20...base, 21...base base, 21a...opening, 22...first base protrusion, 221...first bearing portion, 222...first groove portion, 23...second base protrusion, 231...second bearing portion, 232...second groove portion, 30...lid body, 31...lid base, 32...lid protrusion, 321...first shaft portion, 321a...first notch, 322...second shaft portion, 322a...second notch, 40...coil spring.

Claims

1. a base that is attached to a panel together with a switch body and exposes an operating portion provided on the switch body through an opening formed in the base; a lid body that is engaged with the base via an engaging means and is provided so as to be swingable in a manner to open and close the opening; Equipped with The cover closes the opening to prevent erroneous operation of the operation unit, The engagement means is a shaft portion formed on one of the base and the lid; a bearing portion formed on the other of the base and the lid, the bearing portion rotatably holding the shaft portion when the shaft portion is inserted; a groove portion that is formed in a manner that communicates with the bearing portion and that allows the shaft portion to pass through only when the swing angle of the lid body in the direction in which the opening portion is opened is a predetermined angle; It is equipped with The erroneous operation prevention cover is characterized in that, when the base is attached to the panel, the lid body has a swing angle in a direction to open the opening that is restricted to less than the predetermined angle.

2. 2. The erroneous operation prevention cover according to claim 1, further comprising a biasing means interposed between the base and the lid for biasing the lid in a manner to swing the lid in a direction to close the opening.

3. 3. The erroneous operation prevention cover according to claim 2, wherein the shaft portion is formed on the lid body, and the bearing portion is formed on the base.

4. The shaft portion is A first shaft portion having a cylindrical shape and a first planar notch formed along a central axis of the first shaft portion; a second shaft portion having a cylindrical shape and a second notch formed along its central axis on a portion opposite to the first shaft portion; The erroneous operation prevention cover according to claim 3, further comprising:

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