Electromagnetic contactor

Abstract

To provide an electromagnetic contactor that can be provided with both an operation indicator protection function and a charging unit protection function, and can also be provided with only the operation indicator protection function.SOLUTION: An opening 9 provided in a housing 4 is covered with a first protective cover 25 connected to the housing. Furthermore, the power supply side and load side terminals 6a, 6b provided in the housing 2B are covered with a flat plate-shaped second protective cover 30 connected to the first protective cover.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an electromagnetic contactor having a detachable protective cover for protecting an operation display unit or a terminal unit. [Background technology]

[0002] The top cover of the electromagnetic contactor is provided with primary and secondary terminals, and an opening is formed between the primary and secondary terminals. A contact support for a contact mechanism fixed to a movable iron core of an electromagnet unit is disposed inside the housing of the electromagnetic contactor, and an operating protrusion of the contact support appears and disappears in the opening, thereby functioning as an operating indicator.

[0003] The electromagnetic contactor of Patent Document 1 has a first protective cover (operation display protective cover) that covers the opening of the operation display unit and is removably attached to the top cover, and has an operation display unit protection function that prevents dust from entering the contact mechanism inside the housing through the opening, or prevents erroneous operation of the operation display unit of the contact support of the contact mechanism.

[0004] In addition, the electromagnetic contactor of Patent Document 2 has a second protective cover (livery unit protective cover) that covers the primary and secondary terminal portions and is removably attached to the periphery of the opening of the top cover, and has a livery unit protection function that prevents electric shock to the primary and secondary terminal portions. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 5-290705 [Patent Document 2] JP 2000-113791 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, as shown in Patent Documents 1 and 2, a conventional electromagnetic contactor is equipped with either a first protective cover or a second protective cover, and cannot simultaneously have an operation indicator protection function and a live section protection function.

[0007] Therefore, an object of the present invention is to provide an electromagnetic contactor that can simultaneously have an operation indicator protection function and a charging unit protection function, and can also have only the operation indicator protection function. [Means for solving the problem]

[0008] In order to achieve the above-mentioned object, an electromagnetic contactor according to one embodiment of the present invention has a contact mechanism and an electromagnetic device disposed inside a housing, the housing covering the contact mechanism is formed with power supply side and load side terminal portions and an opening, and an operation indicator provided on a contact support of the contact mechanism appears and disappears inside the opening by on / off driving of the electromagnetic device, a first protective cover covering the opening is removably attached to the housing, and the first protective cover is provided with a cover connecting portion for connecting a flat-shaped second protective cover covering the power supply side and load side terminal portions. Effect of the Invention

[0009] The electromagnetic contactor of the present invention has a first protective cover attached to a housing and a second protective cover connected to the first protective cover, which covers the terminal portions on the power source side and the load side. Therefore, it is possible to simultaneously provide an operation indicator protection function for preventing the intrusion of dust into the contact mechanism inside the housing through the opening or for preventing erroneous operation of the operation indicator of the contact mechanism, and a live section protection function for preventing electric shock to the primary and secondary terminal portions. By attaching only the first protective cover to the housing, it is possible to provide only the operation indicator protection function. [Brief description of the drawings]

[0010] [Figure 1] FIG. 2 is an exploded perspective view showing a state in which a first protective cover and a second protective cover are attached to the electromagnetic contactor in the first embodiment according to the present invention. [Diagram 2]FIG. 2 is a front view of the electromagnetic contactor. [Diagram 3] FIG. 3 is a view taken along line AA in FIG. 2. [Figure 4] FIG. 3 is a view taken along line BB in FIG. 2. [Diagram 5] FIG. 4 is a perspective view showing the shape of a first protective cover used in the first embodiment. [Figure 6] FIG. 2 is a cross-sectional view of a main part showing a state in which a first protective cover and a second protective cover are attached to the electromagnetic contactor in the first embodiment. [Figure 7] FIG. 2 is a perspective view showing a state in which a first protective cover and a second protective cover are attached to the electromagnetic contactor in the first embodiment. [Figure 8] FIG. 11 is a perspective view showing the shape of a first protective cover used in a second embodiment according to the present invention. [Figure 9] FIG. 11 is a perspective view showing a state in which a first protective cover and a second protective cover are attached to an electromagnetic contactor in a second embodiment. [Figure 10] FIG. 11 is a cross-sectional view of a main part showing a state in which a first protective cover and a second protective cover are attached to an electromagnetic contactor in a second embodiment. [Figure 11] FIG. 11 is a perspective view showing the shape of a first protective cover used in a third embodiment according to the present invention. [Figure 12] FIG. 11 is a perspective view showing a state in which a first protective cover and a second protective cover are attached to an electromagnetic contactor in a third embodiment. [Figure 13] FIG. 11 is a cross-sectional view of a main part showing a state in which a first protective cover and a second protective cover are attached to an electromagnetic contactor in a third embodiment. [Figure 14] FIG. 13 is a perspective view showing the shape of a first protective cover used in a fourth embodiment according to the present invention. [Figure 15] FIG. 11 is a perspective view showing a state in which a first protective cover and a second protective cover are attached to an electromagnetic contactor in a fourth embodiment. [Figure 16] FIG. 13 is a simplified cross-sectional view showing a connected state of a first protective cover and a second protective cover in the fourth embodiment. [Figure 17]FIG. 13 is a perspective view showing the shape of a first protective cover used in a fifth embodiment according to the present invention. [Figure 18] FIG. 13 is a perspective view showing a state in which a first protective cover and a second protective cover are attached to an electromagnetic contactor in a fifth embodiment. [Figure 19] 13 is a simplified cross-sectional view showing a connected state of a first protective cover and a second protective cover in the fifth embodiment. FIG. [Figure 20] FIG. 13 is a perspective view showing the shape of a first protective cover used in a sixth embodiment according to the present invention. [Figure 21] FIG. 13 is a plan view showing the shape of a second protective cover used in the sixth embodiment. [Figure 22] FIG. 13 is a perspective view showing a state in which a first protective cover and a second protective cover are attached to an electromagnetic contactor in a sixth embodiment. [Figure 23] 23 is a view taken along the line CC in FIG. 22. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Next, an embodiment of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are given the same or similar reference numerals. However, it should be noted that the drawings are schematic, and the relationship between thickness and planar dimensions, the thickness ratio of each layer, etc., differ from the actual ones. Therefore, the specific thickness and dimensions should be determined with reference to the following description. In addition, it goes without saying that the drawings include parts with different dimensional relationships and ratios.

[0012] In addition, the embodiments shown below are merely examples of devices and methods for embodying the technical idea of ​​the present invention, and the technical idea of ​​the present invention does not specify the materials, shapes, structures, arrangements, etc. of the components to those described below. The technical idea of ​​the present invention can be modified in various ways within the technical scope defined by the claims.

[0013] In addition, terms indicating directions such as "upper," "lower," "front," "rear," "left," and "right" used in the following description are used with reference to the directions in the accompanying drawings. [First embodiment]

[0014] As shown in FIG. 1, the electromagnetic contactor 1 according to the first embodiment of the present invention has a housing formed of a first frame 2A and a second frame 2B made of synthetic resin having electrical insulation. The first frame 2A is a rectangular cylinder with a bottom, and a mounting plate portion 3 is formed at the four corners of the rear end. The second frame 2B is a rectangular cylinder with an open rear end, and an arc-extinguishing cover 4 that covers a contact mechanism 10 (described later) is detachably attached to the front end. As shown in FIG. 2, power supply side terminals 6a, 6b, 6c, and 6d and a coil terminal portion 8 are formed on the upper side of the second frame 2B. Load side terminals 7a, 7b, 7c, and 7d are formed on the lower side of the second frame 2B. The electromagnetic contactor 1 is arranged in a distribution board by fixing a fixing screw penetrating the mounting plate portion 3 to a distribution board or the like attached to a wall.

[0015] 3 shows the internal structure of the electromagnetic contactor 1, which includes a contact mechanism 10 mounted in the second frame 2B, and an electromagnet unit 12 mounted in the first frame 2A and serving as an electromagnet device for turning the contact mechanism 10 on and off. The electromagnet unit 12 includes a fixed core 13 disposed on the bottom side of the first frame 2A, a movable core 14 disposed with its armature surface 14a facing the armature surface 13a of the fixed core 13, an electromagnetic coil 15 disposed by being inserted into a central protruding portion 13b of the fixed core 13, and a return spring 16 disposed between the front side of the electromagnetic coil 15 and the movable core 14. The electromagnetic coil 15 has a bobbin 21 and a winding 22 wound around the cylindrical portion of the bobbin 21.

[0016] The contact mechanism 10 comprises multiple sets of power supply side fixed contactors 18a and load side fixed contactors 18b fixed to the second frame 2B and arranged in a row in the left-right direction, a contact support 19 mounted inside the second frame 2B so as to be freely movable in the front-to-rear direction, and multiple movable contactors 20 supported by the contact support 19 and moving in the front-to-rear direction so that movable contacts 20a, 20b can be brought into contact with and separated from fixed contacts 18a1 of the multiple sets of power supply side fixed contactors 18a and fixed contacts 18b1 of the multiple sets of load side fixed contacts 18b.

[0017] 1, the arc-extinguishing cover 4 attached to the second frame 2B has a rectangular opening 9. Inside the opening 9, an operation indicator 23, which is an operation indicator, and a pair of frame protrusions 24a, 24b are arranged.

[0018] As shown in FIG. 4, the operation indicator 23 is integrally formed on the upper part of the contact support 19, and appears and disappears toward the opening 9 as the contact support 19 moves forward and backward during the opening and closing operation of the electromagnetic contactor 1, and functions as an operation indicator of the electromagnetic contactor 1. Note that, during the opening operation of the electromagnetic contactor 1, the operation indicator 23 moves to a position where it does not protrude outside the opening 9 (to the front side of the arc-extinguishing cover 4). As shown in FIG. 4, the pair of frame protrusions 24a, 24b are formed integrally with the second frame 2B, separated from the operation indicator 23 in the left-right direction. One frame protrusion 24a has a tip bent to the right to form a first engagement recess 24a1. The other frame protrusion 24b also has a tip bent to the left to form a first engagement recess 24b1. Also, as shown in FIG. 4, second engagement recesses 4a1, 4b1 are formed on the right and left inner walls 4a, 4b that form the opening 9.

[0019] Next, reference numeral 25 in FIG. 1 denotes a first protective cover that covers the opening 9 of the electromagnetic contactor 1, and reference numeral 30 in FIG. 1 denotes a second protective cover that covers the power supply side terminals 6a, 6b, 6c, 6d and the load side terminals 7a, 7b, 7c, 7d from the front.

[0020] The first protective cover 25 is formed of a transparent synthetic resin having electrical insulation properties, and as shown in Figures 5(a) and (b), is provided with a cover body 26 which is a rectangular flat plate that is approximately the same as the opening 9 formed in the arc-extinguishing cover 4, a pair of legs 27a, 27b extending parallel to each other from two opposing sides of the cover body 26, outward claw portions 27a1, 27b1 formed outward (in directions that do not face each other) at the tips of the pair of legs 27a, 27b, and a pair of first connecting holes 28a, 28a formed in the cover body 26.

[0021] The second protective cover 30 is also a rectangular plate made of a transparent synthetic resin having electrical insulation properties, and as shown in FIG. 1, a pair of second connecting holes 31a, 31b having the same diameter as the first connecting holes 28a, 28a of the first protective cover 25 are formed in the center in the longitudinal direction, and four voltage tester insertion holes 32a to 32d are formed on one side in the longitudinal direction.

[0022] In addition, the housing of the present invention corresponds to the second frame 2B and the arc-extinguishing cover, the housing engagement portion of the present invention corresponds to the second engagement recesses 4a1, 4b1 of the inner walls 4a, 4b, the first connecting hole of the present invention corresponds to the first connecting holes 28a, 28b, the second connecting hole of the present invention corresponds to the second connecting holes 31a, 31b, and the cover connection portion of the present invention corresponds to the first connecting holes 28a, 28b, the second connecting holes 31a, 31b and the push rivet 33.

[0023] The pair of legs 27a, 27b of the first protective cover 25 are inserted into the opening 9 of the arc-extinguishing cover 4. The pair of legs 27a, 27b are elastically deformed inward in the left-right direction as the outward claws 27a1, 27b1 slide against the inner walls 4a, 4b of the arc-extinguishing cover 4, and elastically return to their original shape when the outward claws 27a1, 27b1 fit into the second engagement recesses 4a1, 4b1 of the inner walls 4a, 4b (see FIG. 6). As a result, the first protective cover 25 is attached to the arc-extinguishing cover 4 with the cover body 26 closing the opening 9.

[0024] Next, the second protective cover 30 is placed on the first protective cover 25 with the second connecting holes 31a, 31b corresponding to the first connecting holes 28a, 28a of the cover body 26. At this time, the voltage detector insertion holes 32a to 32d of the second protective cover 30 face the power supply side terminals 6a, 6b, 6c, 6d from the front side.

[0025] Then, the second protective cover 30 is attached to the electromagnetic contactor 1 via the first protective cover 25 by pushing the push rivet 33 shown in FIG.

[0026] According to this embodiment, the second protective cover 30 covers all of the power supply side terminals 6a, 6b, 6c, 6d and the load side terminals 7a, 7b, 7c, 7d and the opening 9 from the front, so that it is possible to simultaneously provide an operation indicator protection function for preventing dust from entering the contact mechanism 10 through the opening 9 or for preventing erroneous operation of the operation indicator 23 of the contact mechanism 10, and a live section protection function for reliably preventing the user from receiving electric shock to the power supply side terminals 6a, 6b, 6c, 6d and the load side terminals 7a, 7b, 7c, 7d.

[0027] Furthermore, by removing the second protective cover 30 from the first protective cover 25, only the first protective cover 25 closes the opening 9 of the arc-extinguishing cover 4, so that it is possible to provide only the operation indicator protection function.

[0028] Furthermore, by fitting the outward claws 27a1, 27b1 of the first protective cover 25 into the second engagement recesses 4a1, 4b1 of the inner walls 4a, 4b of the arc-extinguishing cover 4, the first protective cover 25 can be easily attached to the opening 9 of the arc-extinguishing cover 4, and by pushing the push rivet 33 into the second connecting holes 31a, 31b of the first protective cover 25 and the first connecting holes 28a, 28b of the second protective cover 30, the second protective cover 30 can be easily attached to the first protective cover 25. And, by being attached as described above, even if vibration due to the opening and closing shock of the electromagnetic contactor 1 is transmitted, the arc-extinguishing cover 4 can firmly hold the first protective cover 25, and the first protective cover 25 can firmly hold the second protective cover 30.

[0029] Furthermore, when measuring the voltages of the power supply side terminals 6a, 6b, 6c, and 6d, with the second protective cover 30 attached to the electromagnetic contactor 1, a tester can be inserted into the power supply side terminals 6a, 6b, 6c, and 6d through the voltage tester insertion holes 32a to 32d to measure the voltages, making it easy to check the sequence control circuit, etc.

[0030] Furthermore, by forming the first protective cover 25 and the second protective cover 30 from a transparent synthetic resin, the movement of the operation indicator 23 appearing and disappearing from the opening 9, which functions as an operation indicator, can be easily confirmed visually. [Second embodiment]

[0031] Next, Figures 8 to 10 show a first protective cover 40 and a second protective cover 45 that are attached to an electromagnetic contactor 1 of a second embodiment. Note that since the electromagnetic contactor 1 has the same configuration as the first embodiment shown in Figures 1 to 7, the same reference numerals are used and the description is omitted. Also, the same reference numerals are used to designate members having the same configuration as the first embodiment and the description is omitted.

[0032] The first protective cover 40 is formed of a transparent synthetic resin having electrical insulation properties, and as shown in Figures 8(a) and (b), is provided with a cover body 41 which is a rectangular flat plate that is approximately the same as the opening 9 formed in the arc-extinguishing cover 4 of the electromagnetic contactor 1, a pair of legs 42a, 42b extending parallel to each other from two opposing sides of the cover body 41, inward claws 42a1, 42b1 formed inward (in opposing directions) at the tips of the pair of legs 42a, 42b, a pair of protrusions 43a, 43b protruding parallel to each other from the cover body 41 on the opposite side to the pair of legs 42a, 42b, and a pair of first connecting holes 44a, 44b formed in the cover body 41.

[0033] The second protective cover 45 is a rectangular plate made of transparent synthetic resin having electrical insulation properties, and as shown in Fig. 9, a pair of second communication holes through which a pair of push rivets 33 pass is formed in the center in the longitudinal direction as in the first embodiment, and a pair of slits 46a, 46b are formed at positions sandwiching these second communication holes. In addition, four voltage detector insertion holes 32a to 32d are formed on the upper side of the second protective cover 45.

[0034] Next, a procedure for attaching the first protective cover 40 and the second protective cover 45 to the electromagnetic contactor 1 will be described with reference to FIG.

[0035] The pair of legs 42a, 42b of the first protective cover 40 are inserted into the opening 9 of the arc-extinguishing cover 4. The pair of legs 42a, 42b are elastically deformed outward in the left-right direction as the inward claws 42a1, 42b1 slide over the pair of frame protrusions 24a, 24b, and when the inward claws 42a1, 42b1 fit into the first engagement recesses 24a1, 24b1, the pair of legs 42a, 42b elastically return to their original position. As a result, the first protective cover 40 is attached to the arc-extinguishing cover 4 with the cover body 41 closing the opening 9.

[0036] Next, with the pair of protrusions 43a, 43b inserted into the pair of slits 46a, 46b, the second communication holes (not shown) are aligned with the first connecting holes 44a, 44a of the cover body 41, and the second protective cover 45 is placed on the first protective cover 40. At this time, the voltage detector insertion holes 32a to 32d of the second protective cover 45 face the power supply side terminals 6a, 6b, 6c, 6d from the front side. Then, the push rivet 33 is pushed into the second connecting hole and the first connecting holes 44a, 44b, so that the second protective cover 45 is attached to the electromagnetic contactor 1 via the first protective cover 40.

[0037] Here, as shown in Figure 10, when the tip sides of the pair of protrusions 43a, 43b are deformed inward in the left-right direction (in the direction of arrows B1, B2) so that they approach each other, the cover body 41 is deformed, causing the pair of legs 42a, 42b to move outward in the left-right direction, and the inward claws 42a1, 42b1 are released from the first engagement recesses 24a1, 24b1, making it possible to remove the first protective cover 40 from the arc-extinguishing cover 4.

[0038] In addition, the housing engagement portion of the present invention corresponds to the first engagement recesses 24a1, 24b1 of the pair of frame protrusions 24a, 24b, the cover connection portion of the present invention corresponds to the first connection holes 44a, 44b and the second connection hole and push rivet 33 formed in the second protective cover 45, and the engagement release portion of the present invention corresponds to the pair of protrusions 43a, 43b.

[0039] According to this embodiment, the second protective cover 45 covers all of the power supply side terminals 6a, 6b, 6c, 6d, the load side terminals 7a, 7b, 7c, 7d and the opening 9 from the front, so that it is possible to simultaneously provide an operation indicator protection function for preventing dust from entering the contact mechanism 10 through the opening 9 or for preventing erroneous operation of the operation indicator 23 of the contact mechanism 10, and a live section protection function for reliably preventing the user from receiving electric shock to the power supply side terminals 6a, 6b, 6c, 6d and the load side terminals 7a, 7b, 7c, 7d.

[0040] Furthermore, by removing the second protective cover 45 from the first protective cover 40, only the first protective cover 40 closes the opening 9 of the arc-extinguishing cover 4, so that only the operation indicator protection function can be provided.

[0041] Furthermore, by fitting the inward claws 42a1, 42b1 of the first protective cover 40 into the second engagement recesses 4a1, 4b1, the first protective cover 40 can be easily attached to the opening 9 of the arc-extinguishing cover 4, and by pushing the push rivet 33 into the second connecting holes 44a, 44b of the first protective cover 40 and the connecting hole of the second protective cover 45, the second protective cover 45 can be easily attached to the first protective cover 40. And, by being attached as described above, even if vibrations due to opening and closing shocks of the electromagnetic contactor 1 are transmitted, the arc-extinguishing cover 4 can firmly hold the first protective cover 40, and the first protective cover 40 can firmly hold the second protective cover 45.

[0042] Furthermore, when the protrusions 43a, 43b of the first protective cover 40 are deformed inward in the left-right direction, the inward claws 42a1, 42b1 are released from the first engagement recesses 24a1, 24b1, so that the first protective cover 40 can be easily removed from the arc-extinguishing cover 4.

[0043] Furthermore, when measuring the voltages of the power supply side terminals 6a, 6b, 6c, and 6d, with the second protective cover 45 attached to the electromagnetic contactor 1, a tester can be inserted into the power supply side terminals 6a, 6b, 6c, and 6d through the voltage tester insertion holes 32a to 32d to measure the voltages, making it easy to check the sequence control circuit, etc.

[0044] Furthermore, by forming the first protective cover 40 and the second protective cover 45 from a transparent synthetic resin, the movement of the operation indicator 23 appearing and disappearing from the opening 9, which functions as an operation indicator, can be easily confirmed visually. [Third embodiment]

[0045] Next, FIGS. 11 to 13 show a first protective cover 50 and a second protective cover 55 that are attached to the electromagnetic contactor 1 of the third embodiment.

[0046] The first protective cover 50 is formed of a transparent synthetic resin having electrical insulation properties, and as shown in Figures 11(a) to (c), is provided with a cover body 51 which is a rectangular flat plate which is approximately the same as the opening 9 formed in the arc-extinguishing cover 4 of the electromagnetic contactor 1, a pair of legs 52a, 52b extending parallel to each other from two opposing sides of the cover body 51, inward claws 52a1, 52b1 formed inwardly at the tips of the pair of legs 52a, 52b, and four protrusions 53 protruding parallel to each other from the four corners of the cover body 51 on the opposite side to the pair of legs 52a, 52b.

[0047] The second protective cover 55 is a rectangular plate made of transparent synthetic resin having electrical insulation properties, and as shown in Fig. 12, four connection holes 56 are formed in the center in the longitudinal direction, through which the four protrusions 53 of the first protective cover 40 pass. In addition, four voltage detector insertion holes 32a to 32d are formed on the upper side of the second protective cover 55.

[0048] The first protective cover 50 is attached to the arc-extinguishing cover 4 by inserting the pair of legs 52a, 52b into the opening 9 of the arc-extinguishing cover 4 and engaging the inward claws 52a1, 52b1 with the first engagement recesses 24a1, 24b1, with the cover body 51 blocking the opening 9.

[0049] Furthermore, with the four protrusions 53 of the first protective cover 50 inserted into the four connecting holes 56, the second protective cover 55 is placed on the first protective cover 50, and the heads of the four protrusions 53 protruding from the connecting holes 56 are crimped to form crimped portions 53a. By forming these crimped portions 53a, the second protective cover 55 is fixed to the first protective cover 50. At this time, the voltage detector insertion holes 32a to 32d of the second protective cover 55 face the power supply side terminals 6a, 6b, 6c, and 6d from the front side.

[0050] The cover connecting portion according to the present invention corresponds to the protrusion 53 of the first protective cover 50, the connecting hole 56 of the second protective cover 55, and the crimping portion 53a.

[0051] According to this embodiment, the second protective cover 55 covers all of the power supply side terminals 6a, 6b, 6c, 6d, the load side terminals 7a, 7b, 7c, 7d and the opening 9 from the front, so that it is possible to simultaneously provide an operation indicator protection function for preventing dust from entering the contact mechanism 10 through the opening 9 or for preventing erroneous operation of the operation indicator 23 of the contact mechanism 10, and a live section protection function for reliably preventing the user from receiving electric shock to the power supply side terminals 6a, 6b, 6c, 6d and the load side terminals 7a, 7b, 7c, 7d.

[0052] Furthermore, if the heads of the four protrusions 53 of the first protective cover 50 are not crimped and the second protective cover 55 is not fixed to the first protective cover 50, only the first protective cover 50 will block the opening 9 of the arc-extinguishing cover 4, thereby providing only the operation indicator protection function.

[0053] Furthermore, by fitting the inward claws 52a1, 52b1 of the first protective cover 50 into the first engagement recesses 24a1, 24b1, the first protective cover 50 can be easily attached to the opening 9 of the arc-extinguishing cover 4, and the arc-extinguishing cover 4 can firmly hold the first protective cover 50 even if vibrations caused by the opening and closing shock of the electromagnetic contactor 1 are transmitted. Furthermore, by inserting the four protrusions 53 of the first protective cover 50 into the four connecting holes 56 and crimping the heads of the protrusions 53 protruding from the connecting holes 56 to form crimped portions 53a, the first protective cover 50 can firmly hold the second protective cover 55 even if vibrations caused by the opening and closing shock of the electromagnetic contactor 1 are transmitted.

[0054] Furthermore, when measuring the voltages of the power supply side terminals 6a, 6b, 6c, and 6d, with the second protective cover 55 attached to the electromagnetic contactor 1, a tester can be inserted into the power supply side terminals 6a, 6b, 6c, and 6d through the voltage tester insertion holes 32a to 32d to measure the voltages, making it easy to check the sequence control circuit, etc.

[0055] Furthermore, since the first protective cover 50 and the second protective cover 55 are made of a transparent synthetic resin, the movement of the operation indicator 23 appearing and disappearing from the opening 9, which functions as an operation indicator, can be easily confirmed visually. [Fourth embodiment]

[0056] Next, FIGS. 14 to 16 show a first protective cover 60 and a second protective cover 65 that are attached to the electromagnetic contactor 1 of the fourth embodiment.

[0057] The first protective cover 60 is formed of a transparent synthetic resin having electrical insulation properties, and as shown in Figures 14(a) to (c), is provided with a cover body 61 which is a rectangular flat plate which is approximately the same as the opening 9 formed in the arc-extinguishing cover 4 of the electromagnetic contactor 1, a pair of legs 62a, 62b extending parallel to each other from two opposing sides of the cover body 61, inward claws 62a1, 62b1 formed inwardly at the tips of the pair of legs 62a, 62b, and a pair of engaging protrusions 68a, 68b which protrude from the cover body 61 on the opposite side to the pair of legs 62a, 62b and constitute a pair of snap-fit ​​mechanisms 67a, 67b.

[0058] The second protective cover 65 is a rectangular plate made of transparent synthetic resin having electrical insulation properties, and as shown in FIG. 15, a pair of fitting holes 66a, 66b constituting the above-mentioned snap-fit ​​mechanisms 67a, 67b are formed in the longitudinal center, and four voltage detector insertion holes 32a to 32d are formed on the upper side.

[0059] The first protective cover 60 is attached to the arc-extinguishing cover 4 with the cover body 61 blocking the opening 9 by inserting the pair of legs 62a, 62b into the opening 9 of the arc-extinguishing cover 4 and engaging the inward claws 62a1, 62b1 with the first engagement recesses 24a1, 24b1 shown in Figure 13 of the third embodiment.

[0060] Then, as shown in FIG. 16, the mating protrusions 68a, 68b of the first protective cover 60 are inserted into the mating holes 66a, 66b of the second protective cover 65, and the claw portions 68a1, 68b1 of the mating protrusions 68a, 68b engage with the periphery of the mating holes 66a, 66b, thereby fixing the second protective cover 65 to the first protective cover 60 by a snap-fit ​​connection.

[0061] The cover connecting portion according to the present invention is the snap-fit ​​mechanisms 67a, 67b consisting of the fitting protrusions 68a, 68b and the fitting holes 66a, 66b.

[0062] In this embodiment as well, the second protective cover 65 covers the power supply side terminals 6a, 6b, 6c, 6d, the load side terminals 7a, 7b, 7c, 7d and all of the opening 9 from the front, so that it is possible to simultaneously provide an operation indicator protection function for preventing dust from entering the contact mechanism 10 through the opening 9 or for preventing erroneous operation of the operation indicator 23 of the contact mechanism 10, and a live section protection function for reliably preventing the user from receiving electric shock to the power supply side terminals 6a, 6b, 6c, 6d and the load side terminals 7a, 7b, 7c, 7d.

[0063] Furthermore, if the mating protrusions 68a, 68b of the first protective cover 60 and the mating holes 66a, 66b of the second protective cover 65 are not snap-fitted together and the second protective cover 65 is not fixed to the first protective cover 60, then only the first protective cover 60 will block the opening 9 of the arc-extinguishing cover 4, thereby providing only the operation indicator protection function.

[0064] Furthermore, by fitting the inward claws 62a1, 62b1 of the first protective cover 60 into the first engagement recesses 24a1, 24b1, the first protective cover 60 can be easily attached to the opening 9 of the arc-extinguishing cover 4, and the arc-extinguishing cover 4 can firmly hold the first protective cover 60 even if vibrations due to opening and closing shocks of the electromagnetic contactor 1 are transmitted. Furthermore, since the first protective cover 60 and the second protective cover 65 are snap-fit ​​connected by a pair of snap-fit ​​mechanisms 67a, 67b, the second protective cover 65 can be easily attached to the first protective cover 60, and even if vibrations due to opening and closing shocks of the electromagnetic contactor 1 are transmitted, the second protective cover 65 can be firmly held by the first protective cover 60, and the second protective cover 65 can be easily removed from the first protective cover 60.

[0065] Furthermore, when measuring the voltages of the power supply side terminals 6a, 6b, 6c, 6d, with the second protective cover 65 attached to the electromagnetic contactor 1, a tester can be inserted into the power supply side terminals 6a, 6b, 6c, 6d through the voltage tester insertion holes 32a to 32d to measure the voltages, making it easy to check the sequence control circuit, etc.

[0066] Furthermore, since the first protective cover 60 and the second protective cover 65 are made of a transparent synthetic resin, the movement of the operation indicator 23 appearing and disappearing from the opening 9, which functions as an operation indicator, can be easily confirmed visually. [Fifth embodiment]

[0067] 17 to 19 show a first protective cover 70 and a second protective cover 75 attached to an electromagnetic contactor 1 of a fifth embodiment. This embodiment is a modified example of the first protective cover 60 and the second protective cover 65 of the fourth embodiment, and members having the same configuration as those in the fourth embodiment are given the same reference numerals and will not be described.

[0068] As shown in FIG. 17, the first protective cover 70 has a cylindrical boss 71 protruding from the cover body 61 on the opposite side to the pair of legs 62a, 62b, and is formed between a pair of mating protrusions 68a, 68b that constitute the snap-fit ​​mechanisms 67a, 67b.

[0069] As shown in FIG. 18, the second protective cover 75 has a boss hole 76 formed between the pair of fitting holes 66a, 66b that constitute the snap fit mechanisms 67a, 67b in the left-right direction.

[0070] The first protective cover 70 is attached to the arc-extinguishing cover 4 with the cover body 61 blocking the opening 9 by inserting the pair of legs 62a, 62b into the opening 9 of the arc-extinguishing cover 4 and engaging the inward claws 62a1, 62b1 with the first engagement recesses 24a1, 24b1 shown in Figure 13 of the third embodiment.

[0071] 19, the fitting protrusions 68a, 68b of the first protective cover 70 are inserted into the fitting holes 66a, 66b of the second protective cover 75, and the boss 71 of the first protective cover 70 is inserted into the boss hole 76 of the second protective cover 75. Then, the claws 68a1, 68b1 of the fitting protrusions 68a, 68b engage with the peripheries of the fitting holes 66a, 66b, and the boss 71 fits into the boss hole 76, thereby fixing the second protective cover 75 to the first protective cover 70.

[0072] The cover connecting portion according to the present invention is constituted by snap-fit ​​mechanisms 67a, 67b consisting of fitting protrusions 68a, 68b and fitting holes 66a, 66b, which correspond to boss holes 76 of second protective cover 75 and bosses 71 of first protective cover 70.

[0073] In this embodiment as well, the second protective cover 75 covers the power supply side terminals 6a, 6b, 6c, 6d, the load side terminals 7a, 7b, 7c, 7d and all of the opening 9 from the front, so that it is possible to simultaneously provide an operation indicator protection function for preventing dust from entering the contact mechanism 10 through the opening 9 or for preventing erroneous operation of the operation indicator 23 of the contact mechanism 10, and a live section protection function for reliably preventing the user from receiving electric shock to the power supply side terminals 6a, 6b, 6c, 6d and the load side terminals 7a, 7b, 7c, 7d.

[0074] Furthermore, when the second protective cover 75 is not fixed to the first protective cover 70, only the first protective cover 70 closes the opening 9 of the arc-extinguishing cover 4, so that only the operation indicator protection function can be provided.

[0075] In addition, the first protective cover 70 and the second protective cover 75 are snap-fit ​​connected by a pair of snap-fit ​​mechanisms 67a, 67b, and the boss 71 of the first protective cover 70 fits into the boss hole 76 of the second protective cover 75. This means that the second protective cover 75 can be easily attached to the first protective cover 70, and the second protective cover 75 can be firmly held to the first protective cover 70 even if vibrations caused by the opening and closing impact of the electromagnetic contactor 1 are transmitted.

[0076] Furthermore, when measuring the voltages of the power supply side terminals 6a, 6b, 6c, and 6d, with the second protective cover 75 attached to the electromagnetic contactor 1, a tester can be inserted into the power supply side terminals 6a, 6b, 6c, and 6d through the voltage tester insertion holes 32a to 32d to measure the voltages, making it easy to check the sequence control circuit, etc.

[0077] Furthermore, since the first protective cover 70 and the second protective cover 75 are formed from a transparent synthetic resin, the movement of the operation indicator 23 appearing and disappearing from the opening 9, which functions as an operation indicator, can be easily confirmed visually. [Sixth embodiment]

[0078] Next, FIGS. 20 to 23 show a first protective cover 80 and a second protective cover 85 that are attached to the electromagnetic contactor 1 of the sixth embodiment.

[0079] The first protective cover 80 is a member formed of a transparent synthetic resin having electrical insulation properties, and as shown in Figures 20(a) and (b), the first protective cover 80 is provided with a cover body 81 which is a rectangular flat plate substantially identical to the opening 9 formed in the arc-extinguishing cover 4 of the electromagnetic contactor 1, a pair of legs 82a, 82b extending parallel to each other from two opposing sides of the cover body 81, inward claws 82a1, 82b1 formed inward at the tips of the pair of legs 82a, 82b, a pair of fitting protrusions 88a, 88b protruding from the cover body 81 on the opposite side to the pair of legs 82a, 82b to constitute a pair of snap-fit ​​mechanisms 87a, 87b, a cylindrical boss 83 protruding between the pair of fitting protrusions 88a, 88b, and a step protrusion 84 protruding in a stepped shape in the same direction as the fitting protrusions 88a, 88b and the boss 83 on one side of the cover body 81 between the two opposing sides of the cover body 81 described above.

[0080] The second protective cover 85 is a rectangular plate made of transparent synthetic resin having electrical insulation properties, and as shown in Fig. 21, a pair of fitting holes 86a, 86b constituting snap-fit ​​mechanisms 87a, 87b is formed in the center in the longitudinal direction, and a boss hole 89 is formed between the pair of fitting holes 86a, 86b. In addition, four voltage detector insertion holes 32a to 32d are formed in one end side in the longitudinal direction of the second protective cover 85, and an opening 90 into which the stepped protrusion 84 of the first protective cover 80 enters is formed near the pair of fitting holes 86a, 86b and the boss hole 89 on the other end side in the longitudinal direction.

[0081] The first protective cover 80 is attached to the arc-extinguishing cover 4 with the cover body 81 blocking the opening 9 by inserting the pair of legs 82a, 82b into the opening 9 of the arc-extinguishing cover 4 and engaging the inward claws 82a1, 82b1 with the first engagement recesses 24a1, 24b1 shown in Figure 13 of the third embodiment.

[0082] 22, the fitting protrusions 88a, 88b of the first protective cover 80 are inserted into the fitting holes 86a, 86b of the second protective cover 85, and the boss 83 of the first protective cover 80 is inserted into the boss hole 89 of the second protective cover 85. At this time, the stepped protrusion 84 of the first protective cover 80 is inserted into the opening 90 of the second protective cover 85 from the back side of the second protective cover 85 (the surface side that abuts against the first protective cover 80). As a result, the claws 88a1, 88b1 of the fitting protrusions 88a, 88b engage with the peripheries of the fitting holes 86a, 86b, and the boss 83 fits into the boss hole 89, thereby fixing the second protective cover 85 to the first protective cover 80. Here, as shown in FIG. 23, the end of the stepped protruding portion 84 of the first protective cover 80 inserted into the opening engaging portion 91 of the second protective cover 85 abuts against the periphery of the opening engaging portion 91 from the front side. In this embodiment, by providing the stepped protrusion 84, movement of the second protective cover 85 in the front-rear direction due to the opening and closing shock when the contacts are opened and closed can be suppressed, and the second protective cover 85 is less likely to come off the first protective cover 80.

[0083] The pressing portion according to the present invention corresponds to the stepped protruding portion 84 of the first protective cover 80 and the opening 90 of the second protective cover 85.

[0084] In this embodiment as well, the second protective cover 85 covers the power supply side terminals 6a, 6b, 6c, 6d, the load side terminals 7a, 7b, 7c, 7d and all of the opening 9 from the front, so that it is possible to simultaneously provide an operation indicator protection function for preventing dust from entering the contact mechanism 10 through the opening 9 or for preventing erroneous operation of the operation indicator 23 of the contact mechanism 10, and a live section protection function for reliably preventing the user from receiving electric shock to the power supply side terminals 6a, 6b, 6c, 6d and the load side terminals 7a, 7b, 7c, 7d.

[0085] Furthermore, when the second protective cover 85 is not fixed to the first protective cover 80, only the first protective cover 80 closes the opening 9 of the arc-extinguishing cover 4, so that only the operation indicator protection function can be provided.

[0086] In addition, the first protective cover 80 and the second protective cover 85 are snap-fit ​​connected by a pair of snap-fit ​​mechanisms 87a, 87b, the boss 83 of the first protective cover 80 fits into the boss hole 89 of the second protective cover 75, and the end of the stepped protrusion 84 of the first protective cover 80 abuts against the periphery of the opening engagement portion 91 of the second protective cover 85 from the front side, so that the second protective cover 85 can be firmly held to the first protective cover 80 even if vibrations due to the opening and closing impact of the electromagnetic contactor 1 are transmitted.

[0087] Furthermore, when measuring the voltages of the power supply side terminals 6a, 6b, 6c, and 6d, with the second protective cover 85 attached to the electromagnetic contactor 1, a tester can be inserted into the power supply side terminals 6a, 6b, 6c, and 6d through the voltage tester insertion holes 32a to 32d to measure the voltages, making it easy to check the sequence control circuit, etc.

[0088] Furthermore, since the first protective cover 80 and the second protective cover 85 are formed from a transparent synthetic resin, the movement of the operation indicator 23 appearing and disappearing from the opening 9, which functions as an operation indicator, can be easily confirmed visually. [Explanation of symbols]

[0089] 1 Magnetic contactor 2A 1st Frame 2B 2nd frame 3 Mounting plate 4 Arc extinguishing cover 4a, 4b inner wall 4a1, 4b1 Second engagement recess 6a, 6b, 6c, 6d Power supply terminals 7a,7b,7c,7d Power supply side terminal 8 Coil terminal 9 Openings 10 Contact mechanism 12 Electromagnet unit 13 Fixed core 13a Electrode surface 14 Movable core 14a Electrode surface 15 Electromagnetic Coil 16 Return spring 18a Power supply side fixed contact 18a1 fixed contact 18b Load side fixed contact 18b1 Fixed contact 19 Contact Support 20 Movable contact 20a,20b Movable contact 21 Bobbin 22 Windings 23 Operation display section 24a, 24b A pair of frame protrusions 24a1, 24b1 First engagement recess 25 First protective cover 26 Cover body 27a,27b Legs 27a1, 27b1 Outward claws 28a,28b 1st connection hole 30 Second protective cover 31a,31b 2nd connection hole 32a~32d Voltage tester insertion hole 33 Push Rivet 40 First protective cover 45 Second protective cover 41 Cover body 42a,42b Legs 42a1, 42b1 Inward claws 43a,43b Projection 44a, 44b First connecting hole 46a, 46b Slit 50 First protective cover 51 Cover body 52a,52b Legs 52a1, 52b1 Inward claws 53 Protrusion 53a Crimping part 55 Second protective cover 56 Connection hole 60 First protective cover 65 Second protective cover 61 Cover body 62a,62b Legs 62a1, 62b1 Inward claws 66a,66b Fitting hole 67a, 67b Snap fit mechanism 68a,68b Fitting protrusion 68a1,68b1 Claw part 70 First protective cover 71 Boss 75 Second protective cover 76 Boss hole 80 First protective cover 81 Cover body 82a,82b Legs 82a1, 82b1 Inward claws 83 Boss 84 Step protrusion 85 Second protective cover 86a,86b Fitting hole part 87a, 87b Snap fit mechanism 88a,88b Fitting protrusion 88a1,88b1 Claw part 89 Boss hole 90 Opening 91 Opening engagement part

Claims

1. An electromagnetic contactor in which a contact mechanism and an electromagnet device are disposed inside a housing, said housing has terminals and an opening on the power supply side and the load side, and an operation indicator provided on a contact support of said contact mechanism appears and disappears inside said opening by on / off driving of said electromagnet device, a first protective cover that covers the opening is detachably attached to the housing; An electromagnetic contactor, comprising: a cover connecting portion provided on said first protective cover for connecting a second protective cover having a flat plate shape covering said power supply side and said load side terminal portions.

2. 2. The electromagnetic contactor according to claim 1, wherein the second protective cover is connected to the first protective cover via a cover connecting portion.

3. The electromagnetic contactor according to claim 1, characterized in that the first protective cover comprises a plate-shaped cover body that fits into and closes the opening, at least a pair of legs that are inserted from the cover body into the opening, and claws formed on the pair of legs that engage with housing engagement portions of the opening.

4. 3. The electromagnetic contactor according to claim 2, characterized in that the cover connection portion is composed of a first connecting hole formed in the first protective cover, a second connecting hole formed in the second protective cover, and a push rivet that is pressed into the corresponding first connecting hole and second connecting hole.

5. 3. The electromagnetic contactor according to claim 2, characterized in that the cover connection portion is composed of a connection hole formed in one of the first protective cover and the second protective cover, and a crimping portion which is a protrusion formed in the other of the first protective cover and the second protective cover and inserted into the connection hole, and which crimps a head protruding from the connection hole.

6. 3. The electromagnetic contactor according to claim 2, characterized in that the cover connection portion is a snap-fit ​​mechanism having a mating protrusion portion formed on one of the first protective cover and the second protective cover, and a mating hole portion formed on the other of the first protective cover and the second protective cover, into which the mating protrusion portion fits.

7. 7. The electromagnetic contactor according to claim 6, characterized in that the cover connection portion further includes a boss formed on one of the first protective cover and the second protective cover, and a boss hole formed on the other of the first protective cover and the second protective cover into which the boss fits.

8. The pair of claw portions of the pair of legs are formed as inward claw portions facing each other and engage with the housing engagement portion, The electromagnetic contactor according to claim 3, further comprising an engagement release portion that deforms the cover body so that the pair of inward claw portions are released from engagement with the housing engagement portion, thereby moving the pair of legs in a direction away from each other.

9. 3. The electromagnetic contactor according to claim 2, wherein the first protective cover is provided with a pressing portion that presses the second protective cover, which is disposed in an overlapping state with the first protective cover, against the housing.

10. 9. The electromagnetic contactor according to claim 2, wherein the second protective cover has a voltage detector insertion hole formed at least at a position facing the terminal portion on the power source side.

11. 9. The electromagnetic contactor according to claim 2, wherein the first protective cover and the second protective cover are made of a transparent material.

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