Insulation cover opening and 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 and closing structure for opening and closing an insulating cover that protects a terminal block serving as a user interface for connecting an electric wire with a device such as a noise filter.

Background Art

[0002] Conventionally, as an insulating cover opening and closing structure of a noise filter, for example, the structures shown in FIGS. 11 to 18 have been used.

[0003] As shown in FIGS. 11 and 12, in a conventional noise filter 100, an upper lid 114 is attached to the upper part of a housing 112 that houses a noise filter electric circuit part, and input terminal blocks 116 and output terminal blocks 118 for connecting electric wires are provided before and after the upper part of the housing 112.

[0004] Here, in the description of FIGS. 11 and 12, the X - Y - Z directions are directions orthogonal to each other. Specifically, when looking at the side where the input terminal block of the noise filter 100 is located as the front, the X direction is the left - right direction, the Y direction is the front - back direction, and the Z direction is the up - down direction. Also, 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 back side, the +Z side in the Z direction is the upper side, and the -Z side is the lower side. This is the same in FIGS. 1 to 10 and FIGS. 13 to 18.

[0005] Insulating covers 120 and 122 are provided slidably with respect to the upper lid 114 for each of the input terminal block 116 and the output terminal block 118 in order to prevent electric shock due to contact of a part of the human body or a tool with the terminals to which the electric wires are connected. Note that FIG. 11 shows a state where the insulating covers 120 and 122 are pushed into the upper lid 114 side to open the terminal block side.

[0006] For the insulating covers 120 and 122, a locking structure for locking (fixing) the cover at a closed position covering the terminal block and an open position releasing the covering of the terminal block (exposing the terminal block) is provided.

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

[0008] Furthermore, as shown in Figure 14 when the top cover 114 is removed and its back side is shown, a first fitting projection 130 is provided at a predetermined position on the back surface of the top cover 114. Note that the first fitting projection 130 is shown enlarged as part f.

[0009] Furthermore, as shown in Figure 15, which shows a portion of the input terminal block 116 side of the housing 112, second mating protrusions 128 are provided on both sides of the front of the input terminal block 116 provided on the housing 112. Note that the second mating protrusions 128 are shown enlarged as part g.

[0010] Figure 16 shows the state with the insulating cover 120 locked in the open position, exposing the input terminal block 116. Figure 16(A) shows the insulating cover 120 and top cover 114 removed and viewed from the back, while Figure 16(B) shows a top view.

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

[0012] Figure 17 shows the state in which the insulating cover 120, which was in the open position, is being pulled out towards the closed position. 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 cover 114 toward the input terminal block 116.

[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 as shown, the second mating receiving portion 126 of the insulating cover 120 fits onto the second mating projection 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] Japanese Patent Publication No. 2007-288710 [Overview of the Initiative] [Problems that the invention aims to solve]

[0015] However, in the locking mechanism provided in the insulating cover opening and closing structure of such conventional noise filters, the insulating covers 120 and 122 have two locking points, on both the left and right sides, regardless of whether they are in the open or closed position, which presents the following problem.

[0016] Firstly, when insulating covers 120 and 122 are warped in the left-right direction, sliding the insulating cover 120 to open and close it results in rattling and tilting due to contact at two points on both the left and right sides, which may prevent the insulating covers 120 and 122 from opening and closing smoothly.

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

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

[0019] Furthermore, as shown in Figure 13, because the insulating cover 120 has a long width (left-right width), the first fitting receiving portion 124 and the second fitting receiving portion 126 are susceptible to dimensional tolerances, which leads to a problem where the locking strength during opening and closing changes.

[0020] The present invention aims to provide an opening and closing structure for an insulating cover that has a locking structure that can stably ensure locking strength during opening and closing, regardless of the size or shape of the insulating cover. [Means for solving the problem]

[0021] (Insulating cover opening / closing structure) The present invention relates to an insulating cover opening and closing structure provided on a terminal block for connecting wires of a predetermined device, wherein a plate-shaped insulating cover slides open and closed between a closed position that covers the terminal block and an open position that releases the cover of the terminal block. The insulating cover is characterized by having a locking structure provided in the lateral center perpendicular to the sliding direction of the insulating cover, which fixes the insulating cover in a closed or open position.

[0022] (Configuration of the locking structure) The locking mechanism is, On the back surface of the insulating cover, in the lateral center perpendicular to the sliding direction, a lock bar is formed facing the sliding direction, When the insulating cover is moved to the open position, there is a first lock bar receiving part that fits the lock bar to lock it in the open position, When the insulating cover is moved to the closed position, there is a second lock bar receiving part that fits the lock bar to lock it in the closed position, and is provided with.

[0023] (Fitting of the lock bar receiving part) The first lock bar receiving part locks the insulating cover in the open position by fitting one tip of the lock bar, The second lock bar receiving part locks the insulating cover in the closed position by fitting the other tip of the lock bar.

[0024] (Lock groove and lock bar) The first lock bar receiving part and the second lock bar receiving part have lock grooves opening on the receiving side of the lock bar, The lock bar has lock bar heads formed at each of one tip and the other tip, which fit into the lock grooves.

[0025] (Shape of the lock groove and the lock bar head) The lock groove has a groove shape with the groove width at the entrance narrowed with respect to the internal groove width, The lock bar head has a neck portion narrowed corresponding to the groove width at the entrance of the lock groove, following a substantially triangular head corresponding to the internal groove width of the lock groove.

[0026] (Device configuration) The device with the insulating cover opening and closing structure includes a terminal block, a housing that houses a predetermined electric circuit part, a lid member provided at an upper opening adjacent to the terminal block of the housing, and is composed of, The insulating cover is provided slidably inside the lid member with respect to the terminal block, The first lock bar receiving part is arranged at a position corresponding to the open position of the insulating cover in the lid member, The second lock bar receiving part is arranged at a position corresponding to the closed position of the insulating cover in the terminal block.

[0027] (Terminal block and locking mechanism) A device equipped with an insulating cover opening and closing mechanism, Equipped with input terminal blocks and output terminal blocks, Each of the input and output terminal blocks is provided with a locking mechanism to fix the insulating cover in either the closed or open position.

[0028] (Noise filter) The device is connected wires via , the electrical circuit section housed in the enclosure Includes a noise filter to remove noise that intrudes into the signal. [Effects of the Invention]

[0029] (Insulating cover opening / closing structure) The present invention relates to an insulating cover opening and closing structure provided on a terminal block for connecting wires of a predetermined device, wherein a plate-shaped insulating cover slides open and closed between a closed position that covers the terminal block and an open position that releases the cover of the terminal block. A locking structure is provided in the center of the lateral direction perpendicular to the sliding direction of the insulating cover to fix the insulating cover in the closed or open position. As a result, the insulating cover is less susceptible to warping, rattling during opening and closing of the cover is corrected, enabling smooth opening and closing operation, and the locking structure can form a stable locking strength regardless of the position of the injection gate of the insulating synthetic resin.

[0030] (Effects of the lock structure configuration) Furthermore, the locking structure includes a lock bar formed in the center of the lateral direction perpendicular to the sliding direction on the back surface of the insulating cover, a first lock bar receiving portion that, when the insulating cover is moved to the open position, engages, for example, one end of the lock bar to lock it in the open position, and a second lock bar receiving portion that, when the insulating cover is moved to the closed position, engages, for example, the other end of the lock bar to lock it in the closed position. As a result, 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 the fixed side, in accordance with the opening and closing operation of the insulating cover, making it possible to reliably lock the insulating cover in both the closed and open positions.

[0031] (Effect of lock groove and lock bar) Furthermore, the first and second lock bar receiving sections have lock grooves on the receiving side of the lock bar, and the lock bar has lock bar heads formed at each of its ends that fit into the lock grooves. As the insulating cover moves, the lock bar heads are pushed into the lock grooves of either lock bar receiving section, ensuring secure locking, and the lock can be smoothly released as the lock bar heads disengage from the lock grooves.

[0032] (Effect of the lock groove and lock bar head shape) 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 corresponding to the groove width inside the lock groove, followed by a neck that is narrowed to correspond to the groove width at the entrance of the lock groove. As a result, the roughly triangular head of the lock bar is pressed into the lock groove, which has a narrow groove width at the entrance and a wide groove width inside, so that it can be locked securely with sufficient strength and stable locking strength can be ensured.

[0033] (Effects of the device configuration) Furthermore, the device equipped with an insulating cover opening and closing structure comprises a housing that houses a predetermined electrical circuit section and includes a terminal block, and a lid member provided in the upper opening adjacent to the terminal block of the housing. The insulating cover is slidably mounted on the inside of the lid member relative to the terminal block, and the first lock bar receiving portion is positioned in the lid member to correspond to the open position of the insulating cover, and the second lock bar receiving portion is positioned in the lid member to correspond to the closed position of the insulating cover on the terminal block. Thus, for a predetermined device composed of the housing and the lid member, it is possible to appropriately provide a lock structure consisting of a lock bar, a first lock bar receiving portion, and a second lock bar receiving portion in the insulating cover opening and closing structure.

[0034] (Effects of terminal block and locking mechanism) Furthermore, the device equipped with an insulating cover opening / closing structure includes an input terminal block and an output terminal block, and each of the input and output terminal blocks is provided with a locking structure to fix the insulating cover in the closed or open position. By providing the locking structure for the insulating cover opening / closing structure of each of the input and output terminal blocks provided in the device, it is possible to ensure stable locking strength during opening and closing, regardless of the size or shape of the insulating cover, and to realize a locking structure that enables smooth opening and closing operation.

[0035] (Effect of noise filter) Furthermore, a device equipped with an insulating cover opening and closing structure is connected wires via , the electrical circuit section housed in the enclosure By including a noise filter to remove intruding noise, the insulating cover protecting the input and output terminal blocks of the noise filter can be designed to ensure stable locking strength during opening and closing, regardless of the size or shape of the insulating cover, and to enable a locking structure that allows for smooth opening and closing operation. [Brief explanation of the drawing]

[0036] [Figure 1] This is an explanatory diagram showing the external appearance of a noise filter equipped with an insulating cover opening / closing mechanism with a locking structure. [Figure 2] Figure 1 is an explanatory diagram showing the assembled and disassembled state of the noise filter. [Figure 3] Figure 1 is an explanatory diagram showing the top and front views of the noise filter. [Figure 4] This is an explanatory diagram showing the cross-section along the cutting line aa in Figure 3(A). [Figure 5] This is an explanatory diagram showing the insulating cover of the input terminal block in Figure 1, removed from its original position. [Figure 6] This is an explanatory diagram showing the front, top, and right side views of the top cover of Figure 1 after it has been removed. [Figure 7] This is an explanatory diagram showing the back surface and right-side cross-section of the top cover from Figure 1 after it has been removed. [Figure 8]Figure 1 is an explanatory diagram showing the noise filter with its insulating cover locked in the open position, exposing the input terminal block. [Figure 9] This is an explanatory diagram showing the state of the noise filter in Figure 1, where the insulating cover 20, which was in the open position, is being pulled out towards the closed position. [Figure 10] Figure 1 is an explanatory diagram showing the noise filter's insulating cover locked in the closed position to protect the input terminal block. [Figure 11] This is an explanatory diagram showing the appearance of a noise filter equipped with a conventional locking mechanism for opening and closing an insulating cover. [Figure 12] Figure 11 is an explanatory diagram showing the assembled and disassembled state of a conventional noise filter. [Figure 13] This is an explanatory diagram showing the insulating cover of the input terminal block from Figure 11 removed from the diagram. [Figure 14] This is an explanatory diagram showing the reverse side of the top cover from Figure 11 after it has been removed. [Figure 15] This is an explanatory diagram showing the input terminal block side of the enclosure from Figure 11 in a plan view. [Figure 16] Figure 11 is an explanatory diagram showing a conventional noise filter with its insulating cover locked in the open position, exposing the input terminal block. [Figure 17] Figure 11 is an explanatory diagram showing the state in which the insulating cover 20 of the conventional noise filter, which was in the open position, is being pulled out towards the closed position. [Figure 18] Figure 11 is an explanatory diagram showing the state in which the insulating cover of a conventional noise filter is locked in the closed position to protect the input terminal block. [Modes for carrying out the invention]

[0037] The following describes in detail an embodiment of the insulating cover opening / closing structure according to the present invention, based on the drawings. However, the present invention is not limited to the following embodiments.

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

[0039] Here, a "noise filter" is a device that prevents electronic equipment from malfunctioning due to noise entering the electronic equipment from the outside via power lines, communication lines, etc.

[0040] Furthermore, the "insulating cover" protects the terminal block to which the wires of specified devices such as noise filters are connected, preventing electric shock accidents due to human contact with the terminal block, and also preventing a decrease in insulation resistance by preventing dust from adhering to the terminal block.

[0041] Furthermore, the "insulating cover opening / closing structure" is a structure in which a plate-shaped insulating cover slides open and closed between a closed position that covers the terminal block of a predetermined device and an open position that releases the cover from the terminal block. Note that "covering the terminal block" means "covering the terminal block," and "releasing the cover from the terminal block" means "removing the cover from the terminal block and opening it."

[0042] Furthermore, the insulating cover opening and closing structure of the embodiment is characterized in that a locking structure for fixing the insulating cover in a closed or open position is provided at the center of the lateral direction perpendicular to the sliding direction of the insulating cover.

[0043] This type of locking structure is less susceptible to the effects of warping of the insulating cover, corrects rattling during opening and closing of the cover, enables smooth opening and closing operation, and allows for stable locking strength regardless of the position of the injection gate of the insulating synthetic resin.

[0044] The configuration of the "lock structure" in the embodiment is arbitrary, but for example, it may consist 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 on the back surface of the insulating cover, in the central part in the lateral direction perpendicular to the sliding direction, with both ends functioning as fitting parts.

[0046] Furthermore, the "first lock bar receiving part" locks the lock bar in the open position by engaging, for example, one end of the lock bar, when the insulating cover is moved to the open position that releases the terminal block's cover. Similarly, the "second lock bar receiving part" locks the lock bar in the closed position by engaging, for example, the other end of the lock bar, when the insulating cover is moved to the closed position that covers the terminal block. Note that the location where the lock bar engages with the first lock bar receiving part or the second lock bar receiving part is not limited to the tip of the lock bar, and the structure for engaging is arbitrary, as long as it can lock the insulating cover in the open or closed position.

[0047] Furthermore, the "first lock bar receiving portion" and the "second lock bar receiving portion" have, for example, a lock groove opening on the receiving side of the lock bar, and the "lock bar" has a lock bar head formed on each of its ends, which fits into the lock groove. Also, as mentioned above, the structure for engaging the lock bar with 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 projection that engages with 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 corresponding to the groove width inside the lock groove, followed by a neck (restricted portion) that is narrowed to correspond to the groove width at the entrance of the lock groove.

[0049] This locking mechanism of the insulating cover ensures secure locking as the head of the lock bar is pushed into the lock groove of the lock bar receiver when the insulating cover moves to the open or closed position. Furthermore, the lock can be smoothly released as the head of the lock bar disengages from the lock groove. In particular, the approximately triangular head of the lock bar is pushed into the lock groove, which has a narrow entrance groove width and a wider interior groove width, ensuring sufficient strength for secure locking and stable locking strength.

[0050] Furthermore, certain devices such as noise filters equipped with an insulating cover opening and closing structure consist of a housing and a lid member.

[0051] Here, "enclosure" refers to a device equipped with a terminal block that houses a predetermined electrical circuit section, and includes concepts such as the storage section and the case body. Furthermore, "lid member" refers to a member provided in the upper opening adjacent to the terminal block of the enclosure, and includes concepts such as the storage section cover and the case cover.

[0052] In the lock structure of this embodiment, 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 positioned in the lid member at a position corresponding to the open position of the insulating cover, and the second lock bar receiving portion is positioned in the terminal block at a position corresponding to the closed position of the insulating cover.

[0053] Furthermore, a device equipped with an insulating cover opening and closing structure, such as a noise filter, comprises an input terminal block and an output terminal block, and each of the input and output terminal blocks is provided with a locking structure for fixing the insulating cover in a closed or open position.

[0054] The following describes a specific embodiment. In this embodiment, the "predetermined device" is a "noise filter," the "noise filter" is "composed of a housing equipped with an input terminal block and an output terminal block, and a top cover placed in the upper opening of the housing," and the "locking mechanism for the insulating cover" is composed of a "lock bar on the back of the insulating cover," a "first lock bar receiving part on the back of the top cover," and a "second lock bar receiving part on the terminal block."

[0055] [Specific details of the embodiment] The insulating cover opening and closing structure of the embodiment will be described in detail as follows. a. Structure of the noise filter b. Structure of the insulating cover c. Structure of the top lid d. Structure of a terminal block that is one element of a locking structure e. Insulation cover opening / closing function and locking function f. Modified versions of the present invention

[0056] [a. Structure of the noise filter] First, the structure of the noise filter will be explained. In this explanation, refer to Figure 1, which shows the external appearance of the noise filter equipped with an insulating cover opening / closing structure with a locking mechanism; Figure 2, which shows the assembled and disassembled state of the noise filter of Figure 1; Figure 3, which shows the top and front views of the noise filter of Figure 1; and Figure 4, which shows the cross-section of the cutting line aa in Figure 3(A). Note that Figure 3(A) shows the top view of the noise filter, and Figure 3(B) shows the front view.

[0057] As shown in Figures 1 to 3, the noise filter 10 of the embodiment consists of a housing 12, a top cover 14, a bottom plate 15, and insulating covers 20 and 22.

[0058] The enclosure 12 incorporates one or more noise filter electrical circuits internally, with an input terminal block 16 on the front upper side and an output terminal block 18 on the rear upper side. The input terminal block 16 and the output terminal block 18 are each divided into four sections by partition walls, and screw connections are provided in each section. Therefore, the input terminal block 16 and the output terminal block 18, which serve as the user interface for the noise filter 10, are configured as a three-phase four-wire system with four terminals for one circuit. In this embodiment, a three-phase four-wire system with four terminals for one circuit is used, but it is sufficient to incorporate one or more noise filter electrical circuits, and any connection method such as single-phase two-wire, single-phase three-wire, or three-phase three-wire can be applied.

[0059] An upper 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 slidably mounted in the front-to-back direction on the end face of the upper cover 14 on the input terminal block 16 side, and an insulating cover 22 is slidably mounted in the front-to-back direction on the end face of the upper cover 14 on the output terminal block 18 side.

[0060] Furthermore, in Figures 1 to 3, as shown in the cross-section of Figure 4, the insulating covers 20 and 22 are pushed into the back side of the top cover 14, and the insulating covers 20 and 22 are locked in an open position that exposes 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 explained. For this explanation, please refer to Figure 5, which shows the insulating cover 20 of the input terminal block 16 from Figure 1. Regarding the insulating cover 20, Figure 5(A) shows the front view, Figure 5(B) shows the top view, Figure 5(C) shows the bottom view, Figure 5(D) shows the cross-section of the cutting line aa in Figure 5(B), and Figure 5(E) shows an enlarged view of part a in Figure 5(C).

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

[0063] An upward-facing handle 2012 is formed at the center of the front end of the insulating cover 20, and four downward-facing stoppers 2014 are formed at the lower front end.

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

[0065] The first lock bar head 2410 has a shape that is roughly triangular at its tip, followed by a narrowed lock bar neck 2412, as shown in an enlarged view in Figure 5(E). The insulating cover 22 provided on the output terminal block 18 side has a similar structure to the insulating cover 20 in Figure 5.

[0066] Furthermore, regardless of the location of the injection gate (injection port), the lock bar 24 will never be located far from the injection gate, thus reducing variations in the shape of the lock bar 24. For example, as shown in Figure 5(C), if the injection gate 34 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. Even if the injection conditions fluctuate, the molding of the lock bar 24 will not be affected, and variations in the shape of the lock bar 24 will be reduced or eliminated, enabling a highly accurate lock structure.

[0067] [c. Structure of the top lid] Next, the structure of the top cover 14 will be explained. For this explanation, please refer to Figures 6 and 7, which show the top cover 14 as it is in Figure 1. Regarding the top cover 14, Figure 6(A) shows the front view, Figure 6(B) shows the top view, Figure 6(C) shows the right side view, Figure 7(A) shows the back view (bottom view), Figure 7(B) shows the cross-section at the cutting line cc in Figure 6(B), and Figure 7(C) shows an enlarged view of part b in Figure 7(A).

[0068] As shown in Figures 6(A) to (C), the top cover 14 has a box-shaped top frame body 1410 with an open back surface, and multiple heat dissipation vents are formed on the top surface and left and right sides of the top cover body 1410. A cover insertion opening 1412 is opened in the left-right direction at the upper front end of the top cover body 1410, and a lock bar insertion opening 1414 is continuously opened below the center of the cover insertion opening 1412.

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

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

[0071] As shown in an enlarged view in Figure 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 inlet narrowing portion 2812 at the groove entrance, resulting in a groove shape where 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 Figure 5(E) is inserted into this first lock groove 2810 to lock the insulating cover 20 in the open position.

[0072] Furthermore, the lock bar guide 1418 formed on the front side of the first lock bar receiving portion 28 guides the lock bar 24 of the insulating cover 20 with it inserted, as shown in the cross-section of Figure 4.

[0073] Furthermore, while the structure of the top cover body 1410 on the input terminal block 16 side has been described, these points are also the same for the output terminal block 18 side.

[0074] [d. Structure of the terminal block, which is one element of the locking structure] Next, we will explain the structure of the terminal block, which is one element of the locking structure of the insulating cover. For this explanation, please refer again to Figures 1 to 4.

[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-back center line of the input terminal block 16 located on the upper front of the housing 12, corresponding to the lock bar 24 provided on the back surface of the insulating cover 20, and a second lock groove 3010 opening to the rear is formed in the second lock bar receiving portion 30.

[0076] When the insulating cover 20 is moved to the closed position that covers the input terminal block 16, the second locking groove 3010 of

[0077] The structure in which a second lock bar receiving portion 30 is provided on the terminal block that is one element of the lock structure of the insulating cover 20 protecting the input terminal block 16 is the same for the second lock bar receiving portion 30 provided on the output terminal block 18 that is one element of the lock structure of the insulating cover 22 protecting the output terminal block 18.

[0078] [e. Opening / closing and locking functions for the insulating cover] Next, the opening / closing and locking functions of the insulating cover will be explained using the insulating cover 20 that protects the input terminal block 16 as an example. In this explanation, refer to Figure 8, which shows the insulating cover 20 locked in the open position, exposing the input terminal block 16; Figure 9, which shows the insulating cover 20 being pulled out from the open position toward the closed position; and Figure 10, which shows the insulating cover 20 locked in the closed position, protecting the input terminal block 16. Note that (A) in each figure shows the insulating cover 20 and top cover 14 removed and viewed from the back side, (B) in each figure shows a plan view, Figure 8(C) is an enlarged view of part c in Figure 8(A), and Figure 10(C) is an enlarged view of part d in Figure 10(A). It is.

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

[0080] As shown in Figure 8, in the closed position where the insulating cover 20 releases the cover of the input terminal block 16, the insulating cover 20 is pushed into the top cover 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 is fitted into the first lock bar receiving portion 28 formed on the back surface of the top cover 14, which is the fixed side, and the insulating cover 20 is locked in the open position where the cover of the input terminal block 16 is released.

[0081] In this state, when moving the insulating cover 24 to the closed position that covers and protects the input terminal block 16, the first lock bar head 2410 of the lock bar 24 provided on the insulating cover 20 disengages from the first lock groove 2810 of the first lock bar receiving portion 28 of the upper cover 14, releasing the lock and allowing it to move toward the input terminal block 16, as shown in Figure 9.

[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 is the fixed side, and locks the insulating cover 20 to the open position to cover and protect the input terminal block 16.

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

[0084] (Target device) The above embodiment uses a noise filter as an example of a predetermined device equipped with an insulating cover opening and closing structure, but is not limited to this, and includes any suitable device equipped with a terminal block for connecting wires such as power lines and communication lines.

[0085] (Noise filter) Furthermore, although the above embodiment took a noise filter equipped with a three-phase four-wire input terminal block and output terminal block forming a four-terminal structure for one circuit as an example, it may also be applied to a noise filter equipped with a single-phase two-wire input terminal block and output terminal block forming a two-terminal structure for one circuit, as shown in the conventional example in Figure 11. It can also be applied to noise filters equipped with multi-terminal input terminal blocks and output terminal blocks for any connection method such as single-phase two-wire, single-phase three-wire, or three-phase three-wire, for one or more circuits.

[0086] (others) Furthermore, the present invention includes appropriate modifications that do not impair its purpose and advantages, and is not limited by the numerical values ​​shown in the above embodiments. [Explanation of Symbols]

[0087] 10: Noise filter 12: Cabinet 14:Top lid 1410: Top lid body 1412: Cover insertion slot 1414: Lock bar insertion slot 1416: Notch 1418: Lock 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: Second Lock Bar Head 28: First lock bar receiving section 2810: First lock groove 2812: Groove entrance constriction 30: Second lock bar receiving section 3010: Second lock groove

Claims

1. An insulating cover opening / closing structure is provided on a terminal block for connecting the wires of a predetermined device, and a plate-shaped insulating cover slides open and closed between a closed position that covers the terminal block and an open position that releases the cover of the terminal block, A locking structure is provided to fix the insulating cover in the closed position or the open position. The aforementioned locking structure is A lock bar is formed on the back surface of the insulating cover in the central part in the lateral direction perpendicular to the sliding direction, and is oriented toward the sliding direction. When the insulating cover is moved to the open position, the first lock bar receiving portion engages with the lock bar and locks it in the open position, When the insulating cover is moved to the closed position, a second lock bar receiving portion engages with the lock bar to lock it in the closed position, An insulating cover opening and closing structure characterized by having the following features.

2. An insulating cover opening and closing structure according to claim 1, The first lock bar receiving portion locks the insulating cover in the open position by engaging one end of the lock bar. 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 when the other end of the lock bar engages with it.

3. An insulating cover opening and closing structure according to claim 2, The first lock bar receiving portion and the second lock bar receiving portion have lock grooves open on the receiving side of the lock bar, The insulating cover opening and closing structure is characterized in that the lock bar has a lock bar head formed at each of its two ends, which fits into the lock groove.

4. An insulating cover opening and closing structure according to claim 3, The lock groove has a groove shape in which the groove width at the entrance is narrower than the groove width inside, The insulating cover opening and closing structure is characterized in that the head of the lock bar has a substantially triangular head corresponding to the groove width inside the lock groove, followed by a neck portion that is narrowed to correspond to the groove width at the entrance of the lock groove.

5. An insulating cover opening and closing structure according to any one of claims 1 to 4, The aforementioned device is A housing equipped with the aforementioned terminal block and housing a predetermined electrical circuit section, A cover member provided in the upper opening adjacent to the terminal block of the aforementioned housing, It consists of, The insulating cover is slidably mounted on the inside of the cover member relative to the terminal block. The first lock bar receiving portion is positioned in the lid member at a position corresponding to the open position of the insulating cover. The insulating cover opening and closing structure is characterized in that the second lock bar receiving portion is positioned in a location corresponding to the closed position of the insulating cover on the terminal block.

6. An insulating cover opening and closing structure according to claim 5, The aforementioned device is Equipped with input terminal blocks and output terminal blocks, An insulating cover opening / closing structure characterized in that the input terminal block and the output terminal block are each provided with the locking structure for fixing the insulating cover in a closed position or an open position.

7. An insulating cover opening and closing structure according to claim 6, The device is characterized by including a noise filter that removes noise entering the electrical circuit section housed in the housing via the connected wires, and is an insulating cover opening / closing structure.

Images