Insulation cover opening / closing structure

Abstract

To provide an insulation cover opening / closing structure capable of stably securing a lock strength in the case of opening / closing without being influenced by a size or a shape of an insulation cover.SOLUTION: In a noise filter 10, an insulation cover opening / closing structure is provided in an input terminal block 16 and an output terminal block 18 and slides insulation covers 20 and 22 so as to be freely opened / closed between a closing position where the terminal blocks are covered and an opening position where the coverage of the terminal blocks is canceled. A lock structure which holds the insulation cover at the closing position or the opening position is provided in a central part of the insulation cover. In the lock structure, a lock bar 24 is formed in a central part of a rear face of the insulation cover and in a case where the insulation cover is moved to the opening position, one tip end of the lock bar is fitted to a first lock bar receiving part 28 which is formed on an inner surface of an upper lid 14, such that the insulation cover is locked at the opening position. In a case where the insulation cover is moved to the closing position, the other tip end of the lock bar is fitted to a second lock bar receiving part 30 of the terminal block, such that the insulation cover is locked at the closing position.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to an insulating cover opening / closing structure for opening and closing an insulating cover that protects a terminal block that serves as a user interface for connecting electric wires in a device such as a noise filter. [Background technology]

[0002] Conventionally, as an insulating cover opening and closing structure for a noise filter, for example, the structures shown in Figs.

[0003] As shown in Figures 11 and 12, conventional noise filter 100 has a top cover 114 attached to the top of housing 112 which houses the noise filter electric circuit section, and also has an input terminal block 116 and an output terminal block 118 for connecting electric wires provided at the front and rear of the top of housing 112.

[0004] 11 and 12, the X, Y and Z directions are perpendicular to each other, and more specifically, when the side surface of the noise filter 100 on which the input terminal block 116 is located is viewed from the front, the X direction is the left-right direction, the Y direction is the front-rear direction, and the Z direction is the up-down direction. In addition, the +X side in the X direction is the right side, the -X side is the left side, the +Y side in the Y direction is the front side, the -Y side is the rear side, the +Z side in the Z direction is the upper side, and the -Z side is the lower side. This also applies to Figs. 1 to 10 and Figs. 13 to 18.

[0005] Insulating covers 120, 122 are provided on the input terminal block 116 and the output terminal block 118 so as to be slidable relative to the top lid 114 in order to prevent electric shock caused by contact of a part of the human body, a tool, or the like with the terminals to which electric wires are connected. Note that Fig. 11 shows the state in which the insulating covers 120, 122 are pushed into the top lid 114 side to open the terminal block side.

[0006] The insulating covers 120, 122 are provided with a locking structure for locking (fixing) the covers in a closed position where the terminal blocks are covered and in an open position where the terminal blocks are released from the cover (where the terminal blocks are exposed).

[0007] For example, taking the locking structure of insulating cover 120 provided on input terminal block 116 as an example, insulating cover 120 is a rectangular plate member molded from insulating synthetic resin, with first fitting receiving portions 124 formed at the rear of the left and right side edges and second fitting receiving portion 126 formed at the front, as shown in Fig. 13. Second fitting receiving portion 126 is shown enlarged as portion e.

[0008] 14, which shows the back side of top cover 114, a first fitting protrusion 130 is provided at a predetermined position on the back side of top cover 114. The first fitting protrusion 130 is shown enlarged as part f.

[0009] 15 shows a portion of the input terminal block 116 side of the housing 112, and second fitting protrusions 128 are provided in front of both sides of the input terminal block 116 provided on the housing 112. The second fitting protrusions 128 are shown enlarged as part g.

[0010] Fig. 16 shows a state in which insulating cover 120 is locked in the open position to expose input terminal block 116. Note that Fig. 16(A) shows insulating cover 120 and top lid 114 from the back side with the insulating cover 120 and top lid 114 removed, and Fig. 16(B) shows them in plan.

[0011] When the insulating cover 120 is in the open position, the first fitting projection 130 of the top lid 114 fits into the first fitting receiving portion 124 of the insulating cover 120, locking the insulating cover 120 in the open position.

[0012] Figure 17 shows the insulating cover 120 in the middle of being pulled out from the open position toward the closed position, and Figures 17(A) and (B) are shown from the same perspective as Figures 16(A) and (B). In this case, the insulating cover 120 slides inside the top lid 114 toward the input terminal block 116 side.

[0013] Figure 18 shows the state in which the insulating cover 120 is locked in the closed position to protect the input terminal block 116, and Figures 18(A) and (B) are shown from the same perspective as Figures 16(A) and (B). When the insulating cover 120 is in the closed position in this way, the second fitting receiving portion 126 of the insulating cover 120 fits into the second fitting protrusion 128 of the input terminal block 116, locking the insulating cover 120 in the closed position. [Prior art documents] [Patent documents]

[0014] [Patent Document 1] JP 2007-288710 A Summary of the Invention [Problem to be solved by the invention]

[0015] However, in the locking structure provided in the insulating cover opening and closing structure of such a conventional noise filter, the insulating covers 120, 122 are locked at two locations, on both the left and right sides, in both the open and closed positions, resulting in the following problems:

[0016] First, when insulating covers 120, 122 are warped in the left-right direction, when insulating cover 120 is slid to open or close, the sliding occurs due to contact at two points on both the left and right sides, causing rattling or tilting, and in some cases insulating covers 120, 122 may not be able to be opened or closed smoothly.

[0017] Furthermore, for both the closed and open positions of the insulating covers 120, 122, if the insulating covers are not locked at two points on both the left and right sides but are locked at one point, stable locking strength cannot be expected.

[0018] Furthermore, when insulating covers 120, 122 are molded from insulating synthetic resin, first fitting receiving portion 124 and second fitting receiving portion 126 are located at the four corners, so regardless of the position of the injection gate (injection port), one of the fitting receiving portions will be the farthest from the injection gate (injection port), and the shape of that fitting receiving portion will vary. Also, as an example, when injection gate 134 (injection port) is located near the center as shown in Figure 13, first fitting receiving portion 124 and second fitting receiving portion 126 are located at the farthest from injection gate 134 (injection port), so the shapes of first fitting receiving portion 124 and second fitting receiving portion 126 may vary depending on the injection conditions.

[0019] Furthermore, as shown in FIG. 13, since the width (left-right width) of insulating cover 120 is long, each of first fitting receiving portion 124 and second fitting receiving portion 126 is easily affected by dimensional tolerances, which causes a problem that the locking strength when opening and closing changes.

[0020] An object of the present invention is to provide an opening and closing structure for an insulating cover that is equipped with a locking structure that can stably ensure locking strength when opening and closing, regardless of the size or shape of the insulating cover. [Means for solving the problem]

[0021] (Insulation cover opening and closing structure) The present invention provides an insulating cover opening / closing structure that is provided on a terminal block for connecting electric wires of a predetermined device, and that slides a plate-shaped insulating cover between a closed position for covering the terminal block and an open position for releasing the covering of the terminal block, A lock structure for fixing the insulating cover in a closed or open position is provided at the lateral center portion perpendicular to the sliding direction of the insulating cover.

[0022] (Lock Structure Configuration) The lock structure is a lock bar formed in the center of the rear surface of the insulating cover in a lateral direction perpendicular to the sliding direction, the lock bar being oriented in the sliding direction; a first lock bar receiving portion that engages with the lock bar to lock the insulating cover in the open position when the insulating cover is moved to the open position; a second lock bar receiving portion that engages with the lock bar to lock the insulating cover in the closed position when the insulating cover is moved to the closed position; Equipped with.

[0023] (Fitting of lock bar receiving part) The first lock bar receiving portion locks the insulating cover in the open position by engaging one end of the lock bar, The other end of the lock bar engages with the second lock bar receiving portion to lock the insulating cover in the closed position.

[0024] (Lock groove and lock bar) The first lock bar receiving portion and the second lock bar receiving portion have a lock groove on the receiving side of the lock bar, The lock bar has a lock bar head formed at each of one end and the other end, which fits into the lock groove.

[0025] (Lock groove and lock bar head shape) The lock groove has a groove shape in which the groove width at the entrance is narrower than the groove width at the inside, The lock bar head has a generally triangular head portion corresponding to the groove width inside the lock groove, followed by a neck portion that is narrowed down to correspond to the groove width at the entrance of the lock groove.

[0026] (Device configuration) The device having the insulating cover opening and closing structure includes: A housing having a terminal block and accommodating a predetermined electric circuit unit; a cover member provided on an upper opening adjacent to the terminal block of the housing; It is composed of The insulating cover is slidably provided on the inside of the lid member relative to the terminal block, the first lock bar receiving portion is disposed at a position on the lid member corresponding to the open position of the insulating cover, The second lock bar receiving portion is disposed at a position on the terminal block corresponding to the closed position of the insulating cover.

[0027] (Terminal block and lock structure) The device having the insulating cover opening and closing structure includes: Equipped with input and output terminal blocks, A locking structure is provided for each of the input and output terminal blocks to secure the insulating cover in a closed or open position.

[0028] (Noise filter) The device includes a noise filter that removes noise that enters electronic devices or the like via a power line or the like. Effect of the Invention

[0029] (Insulation cover opening and closing structure) The present invention provides an insulating cover opening / closing structure that is provided on a terminal block for connecting electric wires of a specified device, and that allows a plate-shaped insulating cover to slide freely open and close between a closed position that covers the terminal block and an open position that releases the covering of the terminal block. A locking structure that fixes the insulating cover in the closed or open position is provided in the horizontal center perpendicular to the sliding direction of the insulating cover, so that the structure is less susceptible to warping of the insulating cover, and any rattling that occurs when the cover is opened or closed is corrected, allowing for smooth opening and closing operations. The locking structure can provide stable locking strength regardless of the position of the injection gate for the insulating synthetic resin.

[0030] (Effect of Lock Structure Configuration) In addition, the locking structure includes a lock bar formed facing the sliding direction in the horizontal center of the back surface of the insulating cover perpendicular to the sliding direction, a first lock bar receiving portion into which, for example, one end of the lock bar engages to lock it in the open position when the insulating cover is moved to the open position, and a second lock bar receiving portion into which, for example, the other end of the lock bar engages to lock it in the closed position when the insulating cover is moved to the closed position.Therefore, the lock bar formed from the center of the back surface of the insulating cover moves between the first lock bar receiving portion and the second lock bar receiving portion, which are fixed sides, as the insulating cover is opened or closed, making it possible to reliably lock the insulating cover in each of the closed and open positions.

[0031] (Effect of lock groove and lock bar) In addition, the first lock bar receiving portion and the second lock bar receiving portion have lock grooves opened on the receiving side of the lock bar, and the lock bar is designed to have lock bar heads at each of its ends that fit into the lock grooves.As a result, as the insulating cover moves, the lock bar head is pushed into the lock groove of one of the lock bar receiving portions, enabling reliable locking, and the lock bar head can be smoothly released by slipping out of the lock groove.

[0032] (Effect of lock groove and lock bar head shape) In addition, the lock groove has a groove shape in which the groove width at the entrance is narrower than the groove width inside, and the lock bar head has a roughly triangular head that corresponds to the groove width inside the lock groove, followed by a neck that is narrowed in accordance with the groove width at the entrance of the lock groove.As a result, by pressing the roughly triangular head of the lock bar into the lock groove which has a narrow groove width at the entrance and a wide groove width inside, it can be reliably locked with sufficient strength and stable locking strength can be ensured.

[0033] (Effect of device configuration) In addition, a device equipped with an insulating cover opening / closing structure is composed of a housing having a terminal block and accommodating a specified electrical circuit section, and a lid member provided at an upper opening adjacent to the terminal block of the housing, wherein the insulating cover is slidably provided on the inside of the lid member relative to the terminal block, the first lock bar receiving portion is arranged at a position on the lid member corresponding to the open position of the insulating cover, and the second lock bar receiving portion is arranged at a position on the terminal block corresponding to the closed position of the insulating cover.As such, it is possible to appropriately provide a lock structure composed of a lock bar, first lock bar receiving portion and second lock bar receiving portion in the insulating cover opening / closing structure for a specified device composed of a housing and a lid member.

[0034] (Effect of terminal block and lock structure) In addition, the device equipped with the insulating cover opening and closing structure is equipped with an input terminal block and an output terminal block, and a locking structure that fixes the insulating cover in a closed or open position is provided for each of the input terminal block and the output terminal block.By providing a locking structure for each of the insulating cover opening and closing structures for the input terminal block and the output terminal block provided in the device, it is possible to realize a locking structure that enables smooth opening and closing operations by stably ensuring the locking strength when opening and closing regardless of the size or shape of the insulating cover.

[0035] (Noise filter effect) In addition, since a device equipped with an insulating cover opening and closing structure includes a noise filter that removes noise that enters electronic devices, etc. via power lines, etc., the insulating cover that protects the input terminal block and output terminal block of the noise filter is not affected by the size or shape of the insulating cover, and the locking strength when opening and closing can be stably ensured, making it possible to realize a locking structure that enables smooth opening and closing operations. [Brief description of the drawings]

[0036] [Figure 1] 1 is an explanatory diagram showing the appearance of a noise filter provided with an insulating cover opening / closing structure having a lock structure; [Diagram 2] 2 is an explanatory diagram showing an assembled and disassembled state of the noise filter in FIG. 1. [Diagram 3] 2 is an explanatory diagram showing a plan view and a front view of the noise filter of FIG. 1. [Figure 4] FIG. 4 is an explanatory diagram showing a cross section taken along line aa in FIG. [Diagram 5] FIG. 2 is an explanatory diagram showing an insulating cover of the input terminal block of FIG. 1. [Figure 6] 2 is an explanatory diagram showing the front, top, and right side of the top cover of FIG. 1. [Figure 7] 2A and 2B are explanatory views showing the back surface and the right side cross section of the upper cover of FIG. 1 taken out. [Figure 8] 2 is an explanatory diagram showing a state in which an insulating cover of the noise filter in FIG. 1 is locked in an open position to expose an input terminal block. FIG. [Figure 9] 2 is an explanatory diagram showing a state in which an insulating cover 20 of the noise filter in FIG. 1 is in the middle of being pulled out toward a closed position. [Figure 10] 2 is an explanatory diagram showing a state in which the insulating cover of the noise filter in FIG. 1 is locked in a closed position to protect the input terminal block. FIG. [Figure 11] 1 is an explanatory diagram showing the appearance of a noise filter provided with an insulating cover opening / closing structure having a conventional lock structure; [Figure 12] 12 is an explanatory diagram showing an assembled and disassembled state of the conventional noise filter of FIG. 11. [Figure 13] 12 is an explanatory diagram showing the insulating cover of the input terminal block of FIG. 11. [Figure 14] FIG. 12 is an explanatory diagram showing the back side of the upper cover of FIG. 11 taken out. [Figure 15] 12 is an explanatory diagram showing a plan view of the input terminal block side of the housing in FIG. 11. [Figure 16] 12 is an explanatory diagram showing a state in which the insulating cover of the conventional noise filter of FIG. 11 is locked in an open position to expose the input terminal block. [Figure 17] 12 is an explanatory diagram showing a state in which an insulating cover 20 of the conventional noise filter in FIG. 11 is in the middle of being pulled out toward a closed position from an open position. [Figure 18] 12 is an explanatory diagram showing a state in which the insulating cover of the conventional noise filter of FIG. 11 is locked in a closed position to protect the input terminal block. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0037] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an insulating cover opening / closing structure according to the present invention will be described in detail below with reference to the drawings. However, the present invention is not limited to the following embodiment.

[0038] [Basic Concept of the Embodiment] First, a basic concept of the embodiment will be described. The embodiment generally relates to an insulating cover opening / closing structure for opening and closing an insulating cover that protects a terminal block that serves as a user interface for connecting electric wires in a specified device, and the embodiment takes a noise filter as an example.

[0039] Here, the term "noise filter" refers to a device that prevents electronic devices from malfunctioning due to noise that enters the electronic devices from the outside via a power line, a communication line, or the like.

[0040] An "insulating cover" is a device that protects a terminal block to which electric wires of a specific device such as a noise filter are connected, preventing electric shock accidents caused by human contact with the terminal block, and also prevents dust from adhering to the terminal block, thereby preventing a decrease in insulation resistance.

[0041] In addition, the "insulating cover opening and closing structure" is a structure in which a plate-shaped insulating cover slides freely between a closed position in which the terminal block of a specified device is covered and an open position in which the terminal block is released from the cover. Note that "covering the terminal block" means "covering the terminal block," and "removing the cover on the terminal block" means "removing the cover on the terminal block to open it."

[0042] The insulating cover opening / closing structure of the embodiment is characterized in that a lock structure for fixing the insulating cover in a closed or open position is provided in the central portion in the lateral direction perpendicular to the sliding direction of the insulating cover.

[0043] This type of locking structure is less susceptible to warping of the insulating cover, corrects any rattling that occurs when the cover is opened or closed, allowing for smooth opening and closing operations, and enables the locking structure to provide stable locking strength regardless of the position of the insulating synthetic resin injection gate.

[0044] The "lock structure" of the embodiment may have any configuration, but may be, for example, made up of a lock bar, a first lock bar receiving portion, and a second lock bar receiving portion.

[0045] Here, the "lock bar" refers to a rod-shaped portion formed toward the sliding direction in the horizontal center of the back surface of the insulating cover, perpendicular to the sliding direction, and the tips of both ends function as fitting portions.

[0046] Moreover, the "first lock bar receiving portion" is a portion into which, for example, one end of the lock bar fits and locks in the open position when the insulating cover is moved to the open position to release the terminal block. Moreover, the "second lock bar receiving portion" is a portion into which, for example, the other end of the lock bar fits and locks in the closed position when the insulating cover is moved to the closed position to cover the terminal block. The location where the lock bar fits into the first lock bar receiving portion or the second lock bar receiving portion is not limited to the end of the lock bar, and the structure for this fit is also arbitrary as long as it can lock the insulating cover in the open position or the closed position.

[0047] Furthermore, the "first lock bar receiving portion" and the "second lock bar receiving portion" have, for example, a lock groove opened on the receiving side of the lock bar, and the "lock bar" has a lock bar head formed at each of one end and the other end that fits into the lock groove. Also, as described above, the structure for fitting the lock bar to the first lock bar receiving portion or the second lock bar receiving portion is arbitrary, and for example, a groove may be provided on the lock bar side, and a protrusion that fits into the groove may be provided on the lock bar receiving portion side.

[0048] Furthermore, the "lock groove" has a groove shape in which the groove width at the entrance is narrower than the groove width inside, and the "lock bar head" has a roughly triangular head that corresponds to the groove width inside the lock groove, followed by a neck portion (narrowed portion) that is narrowed in accordance with the groove width at the entrance of the lock groove.

[0049] With this locking structure for the insulating cover, the head of the lock bar is pushed into the lock groove of the lock bar receiving part as the insulating cover moves to the open or closed position, thereby enabling a reliable locking, and the head of the lock bar is pulled out of the lock groove, allowing the lock to be released smoothly. In particular, the approximately triangular head of the lock bar is pushed into the lock groove, which has a narrow groove width at the entrance and a wide groove width inside, thereby enabling a reliable locking with sufficient strength and ensuring stable locking strength.

[0050] Furthermore, a given device such as a noise filter having an insulating cover opening and closing structure is composed of a housing and a cover member.

[0051] Here, the "casing" is a member that includes a terminal block and houses a predetermined electric circuit unit, and includes concepts such as a storage unit, a case main body, etc. Also, the "lid member" is a member that is provided at the upper opening adjacent to the terminal block of the housing, and includes concepts such as a storage unit cover, a case cover, etc.

[0052] In the locking structure of the embodiment, the insulating cover is slidably provided on the inside of the cover member relative to the terminal block, the first lock bar receiving portion is positioned at a position on the cover member corresponding to the open position of the insulating cover, and the second lock bar receiving portion is positioned at a position on the terminal block corresponding to the closed position of the insulating cover.

[0053] In addition, a device equipped with an insulating cover opening and closing structure, such as a noise filter, has an input terminal block and an output terminal block, and each of the input terminal block and the output terminal block is provided with a lock structure that fixes the insulating cover in a closed position or an open position.

[0054] In the following, a specific embodiment will be described. In the embodiment, the "predetermined device" is a "noise filter", the "noise filter" is "composed of a housing having an input terminal block and an output terminal block, and a top cover placed on the top opening of the housing", and the "locking mechanism of the insulating cover" is composed of a "lock bar on the back surface of the insulating cover", a "first lock bar receiving portion on the back surface of the top cover", and a "second lock bar receiving portion of the terminal block".

[0055] [Specific details of the embodiment] The insulating cover opening / closing structure of the embodiment will be described in detail as follows. a. Noise filter structure b. Structure of the insulating cover c. Top cover structure d. Terminal block structure that is one element of the lock structure e. Insulation cover opening / closing and locking functions f. Modifications of the present invention

[0056] [a. Noise filter structure] First, the structure of the noise filter will be described. In this description, reference will be made to Fig. 1, which shows the external appearance of a noise filter provided with an insulating cover opening / closing structure equipped with a locking structure, Fig. 2, which shows the assembled and disassembled state of the noise filter in Fig. 1, Fig. 3, which shows the plan (top) and front (front surface) of the noise filter in Fig. 1, and Fig. 4, which shows a cross section taken along the cutting line aa in Fig. 3(A). Fig. 3(A) shows the plan view of the noise filter, and Fig. 3(B) shows the front view.

[0057] As shown in FIGS. 1 to 3, a noise filter 10 according to an embodiment of the present invention is made up of a housing 12, an upper cover 14, a bottom plate 15, and insulating covers 20 and 22.

[0058] The housing 12 incorporates one or more noise filter electric circuit circuits therein, and an input terminal block 16 is provided at the front upper part, and an output terminal block 18 is provided at the rear upper part. The input terminal block 16 and the output terminal block 18 are each divided into four sections by partition walls, and a screw connection part is provided in each section. For this reason, the input terminal block 16 and the output terminal block 18, which are the user interface of the noise filter 10, are of a three-phase four-wire type with four terminals for one circuit. Note that in the embodiment, a three-phase four-wire type with four terminals for one circuit is used, but as long as one or more noise filter electric circuit circuits are incorporated, any connection method, such as a single-phase two-wire type, a single-phase three-wire type, or a three-phase three-wire type, can be used.

[0059] A top cover 14 is attached and fixed to the upper opening between the input terminal block 16 and the output terminal block 18 of the housing 12. An insulating cover 20 is assembled to the end face of the top cover 14 on the input terminal block 16 side so as to be able to slide freely in the front-rear direction, and an insulating cover 22 is assembled to the end face of the top cover 14 on the output terminal block 18 side so as to be able to slide freely in the front-rear direction.

[0060] In addition, in Figures 1 to 3, as shown in the cross section of Figure 4, the insulating covers 20, 22 are pushed into the back side of the top cover 14, and the insulating covers 20, 22 are locked in an open position exposing the input terminal block 16 and the output terminal block 18.

[0061] [b. Structure of the insulating cover] Next, the structure of the insulating cover will be described. In this description, reference will be made to Fig. 5, which shows the insulating cover 20 of the input terminal block 16 of Fig. 1. Note that Fig. 5(A) shows the front (front surface), Fig. 5(B) shows the plan (top surface), Fig. 5(C) shows the back (bottom surface), Fig. 5(D) shows a cross section of the cutting line aa in Fig. 5(B), and Fig. 5(E) shows an enlarged view of part a in Fig. 5(C).

[0062] As shown in FIG. 5, the insulating cover 20 has a cover body 2010 which is a plate member of various lengths and widths that covers the upper part of the input terminal block 16 shown in FIG. 1, and is manufactured by injection molding of insulating synthetic resin and is transparent or translucent.

[0063] A handle 2012 is formed facing upward in the center of the front end of the insulating cover 20, and stoppers 2014 are formed facing downward in four separate locations on the lower front end.

[0064] A lock bar 24 of a predetermined length is formed integrally in the center of the back surface of the cover body 2010 in the front-rear direction, which is the sliding direction. The lock bar 24 is one element of the locking structure of the insulating cover 20. The lock bar 24 is a rod-shaped part with a rectangular cross section, and has a first lock bar head 2410 formed at one tip, which is the rear end, and a second lock bar head 2420 formed at the other tip, which is the front end.

[0065] 5(E), the first lock bar head 2410 has a generally triangular head at its tip, followed by a narrowed lock bar neck 2412. The insulating cover 22 provided on the output terminal block 18 side has a similar structure to the insulating cover 20 in FIG.

[0066] Furthermore, no matter where the injection gate (injection port) is located, the lock bar 24 will not be located far from the injection gate, which reduces variation in the shape of the lock bar 24. For example, as shown in Fig. 5(C), if the injection gate 34 used during molding is located in the center of the cover body 2010, the lock bar 24 will be located close to the injection gate 34, and even if the injection conditions vary, the molding of the lock bar 24 will not be affected. By reducing or eliminating variation in the shape of the lock bar 24, a highly accurate locking structure can be achieved.

[0067] [c. Top cover structure] Next, the structure of the top cover 14 will be described. In this description, reference will be made to Figures 6 and 7, which show the top cover 14 taken out from Figure 1. Note that, with respect to the top cover 14, Figure 6(A) shows the front (front surface), Figure 6(B) shows the plan (top surface), Figure 6(C) shows the right side, Figure 7(A) shows the back (bottom surface), Figure 7(B) shows the cross section of cutting line cc in Figure 6(B), and Figure 7(C) shows an enlarged view of part b in Figure 7(A).

[0068] 6(A) to 6(C), the top lid 14 has a box-lid shaped upper frame body 1410 with an open back side, and a plurality of heat dissipation ports are formed on the top surface and left and right side surfaces of the top lid body 1410. A cover insertion port 1412 is opened in the left and right directions at the top of the front end of the top lid body 1410, and a lock bar insertion port 1414 is opened continuously below the center of the cover insertion port 1412.

[0069] In addition, notches 1416 are formed in three locations on the left and right sides of the lower front end of the top cover body 1410, and as shown in Figure 2, when assembled into the housing 12, the three partition walls of the input terminal block 16 are fitted into them.

[0070] As shown in FIG. 7(A), a first lock bar receiving portion 28 is formed along the front-to-rear center line 1420 of the top cover body 1410 of the top cover 14 in correspondence with the input terminal block 16 located at the front, and a lock bar guide 1418 is formed on the front side of the first lock bar receiving portion 28.

[0071] As shown enlarged in Fig. 7(C), the first lock bar receiving portion 28 is provided with a first lock groove 2810 that opens to the front. Here, the first lock groove 2810 has a groove entrance narrowed portion 2812 formed at the groove entrance, giving it a groove shape in which the groove width at the entrance is narrower than the groove width inside. The first lock bar head 2410 of the lock bar 24 shown in Fig. 5(E) is inserted into this first lock groove 2810 to lock the insulating cover 20 in the open position.

[0072] As shown in the cross section of FIG. 4, the lock bar 24 of the insulating cover 20 is inserted and guided through a lock bar guide 1418 formed on the front side of the first lock bar receiving portion 28.

[0073] Incidentally, although the structure of the upper cover body 1410 on the input terminal block 16 side has been described, these points also apply to the output terminal block 18 side.

[0074] [d. Terminal block structure as one element of the lock structure] Next, the structure of the terminal block, which is one element of the locking structure of the insulating cover, will be described with reference to Figs.

[0075] As shown in Figures 1 to 4, a second lock bar receiving portion 30 is provided at the upper end of the partition wall corresponding to the front-to-rear center line of the input terminal block 16 provided at the upper front side of the housing 12, in correspondence with the lock bar 24 provided on the rear surface of the insulating cover 20, and a second lock groove 3010 open to the rear side is formed in the second lock bar receiving portion 30.

[0076] When the insulating cover 20 is moved to the closed position to cover the input terminal block 16, the second lock bar head 2420 at the front end of the lock bar 24 provided on the back surface of the insulating cover 20 shown in Figure 5 fits into the second lock groove 3010 of the second lock bar receiving portion 30, locking the insulating cover 20 in the closed position.

[0077] The structure in which a second lock bar receiving portion 30 is provided on the terminal block, which is one element of the locking structure of the insulating cover 20 that protects the input terminal block 16, is also similar to the second lock bar receiving portion 30 provided on the output terminal block 18, which is one element of the locking structure of the insulating cover 22 that protects the output terminal block 18.

[0078] [e. Insulation cover opening / closing and locking functions] Next, the opening / closing function and locking function of the insulating cover will be described using the insulating cover 20 that protects the input terminal block 16 as an example. In this description, reference will be made to Fig. 8, which shows the insulating cover 20 locked in the open position to expose the input terminal block 16, Fig. 9, which shows the insulating cover 20 in the open position being partially pulled out toward the closed position, and Fig. 10, which shows the insulating cover 20 locked in the closed position to protect the input terminal block 16. Note that (A) of each figure shows the insulating cover 20 and the top cover 14 taken out and viewed from the back side, (B) of each figure shows them in plan, Fig. 8(C) shows an enlarged view of part c in Fig. 8(A), and Fig. 10(C) shows an enlarged view of part d in Fig. 10(A). is.

[0079] As described above, the locking structure of the insulating cover 20 that protects the input terminal block 16 is composed of the lock bar 24 of the insulating cover 20 shown in FIG. 5, the first lock bar receiving portion 28 provided on the back surface of the top lid 14 shown in FIG. 7, and the second lock bar receiving portion 30 provided on the input terminal block 16 shown in FIG. 3.

[0080] 8, in the closed position where the insulating cover 20 releases the covering of the input terminal block 16, the insulating cover 20 is pushed into the top lid 14, opening the input terminal block 16. At this time, the first lock bar head 2410 on the rear end side of the lock bar 24 of the insulating cover 20 fits into the first lock bar receiving portion 28 formed on the back surface of the top lid 14, which is the fixed side, and the insulating cover 20 is locked in the open position where the covering of the input terminal block 16 is released.

[0081] In this state, when the insulating cover 24 is moved to the closed position where it covers and protects the input terminal block 16, as shown in the state during movement in Figure 9, the first lock bar head 2410 of the lock bar 24 provided on the insulating cover 20 comes out of the first lock groove 2810 of the first lock bar receiving portion 28 of the top cover 14, the lock is released, and the cover is moved toward the input terminal block 16.

[0082] As shown in Figure 10, when the insulating cover 20 is moved to the closed position to cover the input terminal block 16, the second lock bar head 2420 on the front end side of the lock bar 24 of the insulating cover 20 fits into the second lock groove 3010 of the second lock bar receiving portion 30 formed on the upper part of the partition wall in the central part of the input terminal block 16, which serves as the fixed side, and the insulating cover 20 is locked in the open position where it covers and protects the input terminal block 16.

[0083] [f. Modifications of the present invention] Modifications of the insulating cover opening / closing structure according to the present invention will now be described. In addition to the above-described embodiment, the insulating cover opening / closing structure according to the present invention includes the following modifications.

[0084] (Target device) The above embodiment has taken a noise filter as an example of a specified device equipped with an insulating cover opening and closing structure, but is not limited to this and includes any appropriate device equipped with a terminal block for connecting electric wires such as a power supply line or a communication line.

[0085] (Noise filter) Furthermore, the above embodiment has been exemplified by a noise filter having a three-phase four-wire input terminal block and an output terminal block which form a four-terminal structure for one circuit, but the present invention may be applied to a noise filter having a single-phase two-wire input terminal block and an output terminal block which form a two-terminal structure for one circuit as shown in the conventional example of FIG. 11, and may also be applied to other noise filters having one or more circuits and having input and output terminal blocks with multi-terminal structures for any connection method, such as a single-phase two-wire system, a single-phase three-wire system, or a three-phase three-wire system.

[0086] (others) Furthermore, the present invention includes appropriate modifications that do not impair the objects and advantages of the present invention, and is not limited to the numerical values ​​shown in the above embodiment. [Explanation of symbols]

[0087] 10: Noise filter 12: Housing 14:Top lid 1410: Top cover body 1412: Cover insertion port 1414: Lock bar insertion port 1416:Notch 1418: Rock Bar Guide 15: Bottom plate 16: Input terminal block 18: Output terminal block 20, 22: Insulating cover 24: Rock Bar 2410: First lock bar head 2412: Lock bar neck 2420: 2nd lock bar head 28: First lock bar receiving part 2810: First lock groove 2812: Groove entrance constriction 30: Second lock bar receiving part 3010: Second lock groove

Claims

1. An insulating cover opening / closing structure is provided on a terminal block for connecting electric wires of a predetermined device, and slides a plate-shaped insulating cover between a closed position for covering the terminal block and an open position for releasing the covering of the terminal block, an insulating cover opening / closing structure, comprising: a lock structure for fixing the insulating cover in the closed position or the open position, the lock structure being provided in a lateral central portion perpendicular to a sliding direction of the insulating cover;

2. 2. The insulating cover opening / closing structure according to claim 1, The locking structure includes: a lock bar formed in a lateral center portion of the back surface of the insulating cover in a sliding direction perpendicular to the sliding direction; a first lock bar receiving portion that engages with the lock bar to lock the insulating cover at the open position when the insulating cover is moved to the open position; a second lock bar receiving portion that engages with the lock bar to lock the insulating cover at the closed position when the insulating cover is moved to the closed position; An insulating cover opening and closing structure comprising:

3. 3. The insulating cover opening / closing structure according to claim 2, the first lock bar receiving portion is engaged with one end of the lock bar to lock the insulating cover in the open position; The insulating cover opening and closing structure is characterized in that the second lock bar receiving portion locks the insulating cover in the closed position by engaging with the other end of the lock bar.

4. In the insulating cover opening / closing structure according to claim 3, The first lock bar receiving portion and the second lock bar receiving portion have lock grooves opened on the receiving side of the lock bar, The lock bar has a lock bar head formed at each of one end and the other end thereof, the lock bar head fitting into the lock groove.

5. 5. The insulating cover opening / closing structure according to claim 4, The lock groove has a groove shape in which the groove width at the entrance is narrower than the groove width at the inside, an insulating cover opening / closing structure, wherein the lock bar head has a generally triangular head portion corresponding to the groove width inside the lock groove, followed by a neck portion that is narrowed down to correspond to the groove width at the entrance of the lock groove.

6. The insulating cover opening / closing structure according to any one of claims 1 to 5, The apparatus comprises: a housing including the terminal block and accommodating a predetermined electric circuit unit; a cover member provided on an upper opening adjacent to the terminal block of the housing; It is composed of the insulating cover is slidably provided on the inside of the lid member relative to the terminal block, the first lock bar receiving portion is disposed at a position on the lid member corresponding to an open position of the insulating cover, The insulating cover opening and closing structure, wherein the second lock bar receiving portion is disposed at a position on the terminal block corresponding to a closed position of the insulating cover.

7. 7. The insulating cover opening / closing structure according to claim 6, The apparatus comprises: Equipped with input and output terminal blocks, an insulating cover opening / closing structure, characterized in that a lock structure for fixing the insulating cover in a closed position or an open position is provided for each of the input terminal block and the output terminal block.

8. The insulating cover opening / closing structure according to claim 7, The device is an insulating cover opening and closing structure characterized in that it includes a noise filter that removes noise that enters electronic equipment or the like via a power line or the like.

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