Fuse puller mounting structure and electrical junction box

Abstract

Fuse puller receiving structure (10) with a fuse puller (110), comprising: a puller main body (111) configured to hold a fuse while the fuse is being removed or tightened; a tubular puller receiving section (121) provided with a bottom (121b) and configured to insert and receive the puller main body (111) in an unused state; at least one lateral receiving projection (122) provided in the puller receiving section (121); at least one lateral puller projection (112) provided on the puller main body (111), wherein the lateral puller projection (112) is configured to cross over the at least one lateral receiving projection (122) in an insertion direction (D11) of the puller main body (111) and is then locked to the at least one lateral receiving projection (122) when the puller main body (111) is inserted into the puller receiving section (121); and at least one up-lift section (123) provided on a base (121b) of the puller receiving section (121), wherein the upward push section (123) is configured to bias a front end of the puller main body (111) which is received in the puller receiving section (121) in an upward push direction (D14) to push the lateral puller projection (112) against the lateral receiving projection (122), wherein the front end is directed forward with respect to the insertion direction (D11) and wherein the upward push-up direction (D14) is opposite to the insertion direction (D11).

Description

Background of the invention: Technical field

[0001] The present invention relates to a fuse puller receiving structure in which a fuse puller is housed as a tool for removing / inserting a fuse, and to an electrical junction box containing such a fuse puller receiving structure. State of the art

[0002] Traditionally, a fuse puller is known as a tool for removing / installing a fuse at a mounting position, e.g., for maintenance. Furthermore, electrical junction boxes with such a fuse mounting position are known to have a fuse puller receptacle, wherein the fuse puller receptacle accommodates a fuse puller so that it is always readily available (see, e.g., patent document 1).

[0003] In a fuse puller receptacle structure according to patent document 1, a fuse puller comprises a puller main body configured to clamp and hold a fuse during the removal or installation of the fuse, the puller main body being provided with a lateral puller projection for locking, and a puller receptacle section being provided with a lateral receptacle projection. In a non-used state of the fuse puller, the puller main body is housed within the puller receptacle section, with the lateral puller projection locked to the lateral receptacle projection. During, for example, maintenance work, the main body of the fuse puller, and thus the fuse puller, is pulled out of the fuse puller receptacle section by an operator to remove or install the fuse. Citation list of patent literature

[0004] Patent Document 1: JP H08-315 714 A

[0005] KR 10 2019 0 021 030 A relates to a puller with a gripping section formed around a pivot axis on one side to allow a user to grasp the gripping section, an electronic component clamping section formed around the pivot axis on the other side, and at least one guide projection formed on one side of the clamping section; and a mounting section with a receiving chamber for receiving the puller and a helical guide groove formed on an inner circumferential surface of the receiving chamber. When the puller is inserted into the mounting section while the puller is rotated in one direction, the puller is inserted into the receiving chamber and the guide projection of the puller is screwed into the guide hole of the mounting section. A user can detach the puller from the mounting section by rotating the puller without pushing or pulling the locking puller.

[0006] JP H07 - 51 724 Y2 relates to a fuse holder for holding a cylindrical fuse with contact terminals at both ends, comprising: a holder main body having an overall box-like shape with an opening at the top and connectors on the inside of the bottom for receiving and holding the contact terminals of the fuse; a cover element that can close the opening of the holder main body; and a fuse support element arranged on the back of the cover to position and support the fuse in a fixed lower position relative to the back of the cover, so that the contact terminals of the fuse can engage with the connectors when the opening of the holder main body is closed by the cover. Summary of the invention

[0007] In a safety puller receptacle structure where the puller main body is received in the puller receptacle section, with the puller side projection locking to the receptacle side projection, a gap forms between the puller side projection and the receptacle side projection in a received state. This gap can then lead to instability between the puller main body and the puller receptacle section, potentially generating abnormal noise.

[0008] Therefore, the present invention focuses on such a problem, and thus it is an object of the present invention to provide a fuse puller receiving structure with a fuse puller that makes it possible to suppress the generation of abnormal noises, and to provide an electrical junction box with such a fuse puller receiving structure.

[0009] To achieve the above-described objective, a fuse puller receiving structure with a fuse puller comprises a puller main body configured to hold a fuse when removing or installing the fuse, a tubular puller receiving section with a bottom configured to allow the puller main body to be inserted and received therein in a non-used state, at least one lateral receiving projection provided in the puller receiving section, and at least one lateral puller projection provided on the puller main body, wherein the lateral puller projection is configured to cross over the at least one lateral receiving projection in an insertion direction of the puller main body and then locks into the at least one lateral receiving projection when the puller main body is inserted into the puller receiving section.and at least one upward-pull section provided on a base of the puller receiving section, wherein the upward-pull section is configured to bias a front end of the puller main body received in the puller receiving section in an upward-pull direction to push the lateral puller projection against the lateral receiving projection, wherein the front end is directed forward with respect to the insertion direction and wherein the upward-pull direction is opposite to the insertion direction.

[0010] To solve the task described above, an electrical junction box comprises the fuse puller receiving structure described above with a fuse puller and a junction box main body section, wherein the junction box main body section is configured such that the fuse is attached to or detached from the junction box main body section by means of the puller main body.

[0011] In the fuse puller receptacle and electrical junction box, as previously described, the lateral puller projection crosses the lateral receptacle projection when the puller main body is inserted into the puller receptacle section and locks into place. The lateral puller projection is then pressed against the lateral receptacle projection by preloading the front end of the puller main body with the up-pull section. This pressing action eliminates any gap between the lateral puller projection and the lateral receptacle projection during receptacle insertion, thus eliminating the instability caused by this gap between the puller main body and the puller receptacle section. This elimination of instability therefore suppresses the generation of abnormal noises. Brief description of the drawings Fig. Figure 1 is a perspective external view of an electrical junction box with a structure for receiving a fuse puller according to one embodiment; Fig. Figure 2 is an enlarged perspective view of a fuse puller according to Fig. 1; Fig. Figure 3 is an enlarged perspective view of a recording element according to Fig. 1, which was taken from the electrical junction box, with the receiving element viewed from two directions; Fig. 4 is a top view of the receiving element according to Fig. 3 seen from the insertion direction of the safety puller; Fig. Figure 5 is a top view of the fuse puller receiving structure seen from the insertion direction of the fuse puller, with the fuse puller being inserted into and held by the receiving element; Fig. 6 is a cross-sectional view of the fuse puller receiving structure along the V11-V11 line in Fig. 5; Fig. 7 is a cross-sectional view of the fuse puller receiving structure along the V12-V12 line in Fig. 5; and Fig. Figure 8 shows a fuse puller receiving structure according to a comparative example for comparison with the fuse puller receiving structure according to the embodiment in Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6 to Fig. 7 in a similar cross-sectional view as Fig. 6. Detailed description of preferred embodiments

[0012] The following describes embodiments of a fuse puller receiving structure and an electrical junction box with such a fuse puller receiving structure.

[0013] Fig. Figure 1 shows a perspective external view of an electrical junction box with a fuse puller receiving structure according to one embodiment.

[0014] The electrical junction box 1 according to the present embodiment is configured such that a fuse can be attached to and removed from a junction box main body section 1a using a fuse puller 110 as a tool for attaching / removing, e.g., for maintenance purposes (the fuse is not shown). Furthermore, a fuse puller receiving structure 10 is provided at a corner of the junction box main body section 1a, the fuse puller receiving structure 10 comprising a fuse puller 110 and a receiving element 120 for it. The receiving element 120 is attached to the electrical junction box 1, and the fuse puller 110 is positioned in the electrical junction box 1 such that it is always accessible and is inserted into and received in the receiving element 120 in an insertion direction D11.For maintenance work or similar purposes, the fuse puller 110 is pulled out of the receiving element 120 of the electrical junction box 1 by an operator in order to remove or install the fuse.

[0015] Fig. Figure 2 shows an enlarged perspective view of the safety puller according to Fig. 1, wherein Fig. 3 an enlarged perspective view of a recording element according to Fig. Figure 1 shows the part being pulled out of the electrical junction box, with the receiving element viewed from two directions. Fig. 4 shows a top view of the receiving element according to Fig. 3 from one insertion direction of the safety puller.

[0016] The fuse puller 110 is a tool made of plastic and configured for tightening / removing the fuse. The fuse puller 110 comprises a main puller body 111 and lateral puller projections 112.

[0017] The puller main body 111 is an element having a rectangular tube shape that holds the safety device during the release or application of the safety device. A pair of opposing side walls of the puller main body 111 extends outwards in the insertion direction D11 to form a pair of opposing gripping elements 111a. The pair of gripping elements 111a is configured to hold the safety device by clamping. The puller main body 111 includes gripping claws 111a-1 on one side facing a front end 111b of the puller main body 111 in the insertion direction D11. The gripping claws 111a-1 are configured to lock onto the safety device. Two gripping claws 111a-1 are provided for each of the gripping elements 111a, i.e., a total of four gripping claws 111a-1.

[0018] The lateral puller projections 112 are sections that lock onto the lateral receiving projections 122 of the receiving element 120 when the puller main body 111, and thus the locking puller 110, is received in the receiving element 120. The locking puller 110 is held by the receiving element 120 by the lateral puller projection 112 locking onto the lateral receiving projections 122. According to the present embodiment, the lateral puller projections 112 are configured as projections, each arranged on an outer side face of one of the two opposing gripping elements 111a. Each of the lateral puller projections 112 is positioned such that it is located at its center on one side of the outer side face of a gripping element 111a in a lateral direction, with the side of the outer side face facing the front end 111b.

[0019] The receiving element 120 is a resin-made component configured to be attached to the main body section 1a of the junction box to position the fuse puller 110 within the electrical junction box 1 so that it is always readily available. The receiving element 120 comprises a fuse puller receiving section 121, lateral receiving projections 122, and sliding sections 123.

[0020] The puller receiving section 121 is a section having a bottomed tube shape (in particular a rectangular bottomed tube shape) and configured for inserting and receiving the puller main body 111 in a non-used state. The puller receiving section 121 comprises a pair of opposing inner wall surfaces 121a, which face the outer side surfaces of the pair of opposing gripping elements 111a when the puller receiving section 121 receives the puller main body 111, each of the inner wall surfaces 121a comprising a lateral receiving projection 122 to which a lateral puller projection 112 is locked.

[0021] The lateral receiving projections 122 are provided within the puller receiving section 121 and are configured as sections on which the lateral puller projections 112 are locked when they receive the puller main body 111. According to the present embodiment, a lateral receiving projection 122 is arranged on a section of each pair of opposing inner wall surfaces 121a of the puller receiving section 121, wherein the section is a center of the puller main body 111 in the insertion direction D11 and in the width direction.

[0022] The uplift sections 123 are sections provided in a base 121b of the puller receiving section 121 and configured to pre-tension the front end 111b of the puller main body 111, which is received in the puller receiving section 121, in an uplift direction D14, wherein the front end 111b is directed forward in the insertion direction D11 and wherein the uplift direction D14 is opposite to the insertion direction D11. These uplift sections 123 are designed as cantilever arms, each having one end as a fixed end 123a and the other end as a free end 123b. Furthermore, the cantilever arms as uplift sections 123 are sections cut out of the base 121b of the puller receiving section 121 by forming C-shaped slots 121b-1 therein.Furthermore, according to the present embodiment, a pair of cantilever arms is provided as uplift sections 123 such that they extend parallel to each other offset, wherein a fixed end 123a of one of the cantilever arms is arranged closer to a free end 123b of the other cantilever arm.

[0023] Fig. Figure 5 shows a top view of the fuse puller receiving structure from the insertion direction of the fuse puller, with the fuse puller being inserted into and held by the receiving element. Furthermore, it shows Fig. 6 a cross-sectional view of the fuse puller receiving structure along the line V11-V11 in Fig. 5, and Fig. Figure 7 shows a cross-sectional view of the fuse puller receiving structure along the V12-V12 line in Fig. 5.

[0024] First, when the safety puller 110 is inserted into the receiving element 120, i.e., the puller main body 111 is inserted into the puller receiving section 121, the lateral puller projections 112 cross the lateral receiving projections 122 in the insertion direction D11 of the puller main body 111 in order to lock with them as follows: the lateral puller projections 112 engage with the lateral receiving projections 122 to bend the pair of opposing gripping elements 111a of the puller main body 111 in a bending direction D13 ( Fig. 6) to bend, whereby the pair of gripping elements 111a approach each other in the bending direction D13. Then, bending the gripping elements 111a in this way causes the lateral puller projections 112 to cross over the lateral receiving projections 122, wherein, after the lateral puller projections 112 have completely crossed over the lateral receiving projections 122, the gripping elements 111a are returned so that the lateral puller projections 112 are locked with the lateral receiving projections 122.

[0025] Furthermore, at this time the upward push sections 123 in the base 121b of the puller receiving section 121 press the front end 111b of the puller main body 111 in the upward push direction D14 ( Fig. 7), wherein the front end 111b contains the gripping claws 111a-1. The free ends 123b of the lifting sections 123 are designed as cantilevers, as described above, in a projecting shape, in which they extend inwards into the puller receiving section 121. In this way, the lifting sections 123 are bent in the insertion direction D11 when the puller main body 111 is inserted into the puller receiving section 121, so that the free ends 123b are pressed downwards by a portion of the projection. The lifting sections 123 then pre-tension the front end 111b of the puller main body 111 in the lifting direction D14 with the free ends 123b via a restoring force of the bending. As a result of this preload in the upward push direction D14, the lateral puller projections 112 are pressed against the lateral receiving projections 122 in the upward push direction D14.

[0026] Furthermore, according to the present embodiment, a pair of cantilever arms is provided as the uplift sections 123, which extend parallel to each other offset, as shown in Fig. 4 shown. Then the free end 123b of one of the uplift sections 123 pushes the front end 111b of the puller main body 111 upwards on one of the pair of opposing gripping elements 111a, with the free end 123b of the other of the uplift sections 123 pushing the front end 111b upwards on the other of the gripping elements 111a.

[0027] According to the present embodiment, a pair of uplift sections 123 is arranged in an arrangement direction D12 in the base 121b of the puller receiving section 121, wherein the arrangement direction D12 extends along the base, intersects the insertion direction D11, and coincides with a width direction of the inner wall surfaces 121a and / or the gripping elements 111a of the puller main body 111. The lateral receiving projections 122 and the lateral puller projections 112 are then configured such that, in a state where the projections 122 and 112 are locked together, they are positioned between the pair of uplift sections 123 with respect to the arrangement direction D12.

[0028] The fuse puller mounting structure 10 and the electrical connection box 1 according to the embodiment described above can achieve the effects described below. Before these effects are explained, a test example for comparison with the fuse puller mounting structure 10 according to the embodiment described above is described below.

[0029] Fig. Figure 8 shows a fuse puller receiving structure according to a comparative example for comparison with the fuse puller receiving structure according to the embodiment in Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6 to Fig. 7 in a similar cross-sectional view as Fig. 6. It should be noted that elements in Fig. 8, those in Fig. 6 are similar, are designated with the same reference symbols as in Fig. 6, omitting the repetition of the description of these similar elements in the following description.

[0030] The fuse puller receiving structure 50 according to the one described in this Fig. The experimental example shown in section 8 does not contain a feature corresponding to the upshift section 123 according to Fig.6 corresponds to the puller receiving section 521 of the receiving element 520, wherein the receiving section 521 is configured to receive a puller main body 111 of a locking puller 110 therein. Therefore, when the puller main body 111 is received in the puller receiving section 521 and the lateral puller projections 112 cross over and lock with the lateral receiving projections 522, a gap d51 is formed between the lateral receiving projections 522 and the lateral puller projections 112, since there is no pressure of the lateral puller projections 112 against the lateral receiving projections 522. In the fuse puller receiving structure 50 according to the experimental example, the gap d51 can lead to an instability between the puller main body 111 and the puller receiving section 521, which can generate an abnormal noise.

[0031] In contrast to the fuse puller receiving structure 50 according to the previously described experimental example, the fuse puller receiving structure 10 according to the embodiment described above and the electrical junction box 1 containing the fuse puller receiving structure 10 can suppress the generation of abnormal noises, as described below.

[0032] In the present embodiment, when the puller main body 111 is inserted into the puller receiving section 121, the lateral puller projections 112 intersect and lock onto the lateral receiving projections 122. The lateral puller projections 112 are then pressed against the lateral receiving projections 122 by pre-tensioning the front end 111b of the puller main body 111 with the up-sliding sections 123. This sliding action eliminates any gap between the lateral puller projections 112 and the lateral receiving projections 122 during insertion, thus eliminating the instability that arises between the puller main body 111 and the puller receiving section 121 due to this gap. Therefore, eliminating this instability suppresses the generation of abnormal noise.

[0033] According to the present embodiment, a pair of lateral puller projections 112, each provided on the outer side surface of one of the gripping elements 111a of the puller main body 111, then crosses a pair of lateral receiving projections 122 in order to be locked with the pair of lateral receiving projections 122, while the respective gripping elements 111a are bent, so that the pair of lateral puller projections 112 is locked with the pair of lateral receiving projections 122, the lateral receiving projections 122 being provided on the inner wall surfaces 121a of the puller receiving section 121. This configuration is advantageous because the puller main body 111 can be held firmly by the puller receiving section 121 by locking the pair of lateral puller projections 112 of the puller main body 111 with the pair of lateral receiving projections 122 of the puller receiving section 121.

[0034] Furthermore, the present embodiment is designed such that the lifting sections 123 are configured as cantilever arms, wherein the cantilever arms are bent when receiving the puller main body 111 such that they pre-tension the front end 111b of the puller main body 111 with the free ends 123b of the cantilever arms in the lifting direction D14 via the restoring force. In this arrangement, the received puller main body 111 is pushed upwards by the leaf-spring-like lifting sections 123 in the form of cantilever arms, which exert a high pre-tensioning force. This upward pushing presses the lateral puller projections 112 firmly against the lateral receiving projections 122, thus further suppressing abnormal noises.

[0035] Furthermore, according to the present embodiment, the cantilever arms are the uplift sections 123, which are cut out of the base 121b of the puller receiving section 121 by forming C-shaped slots 121b-1 in it. In this configuration, a portion of the base 121b of the puller receiving section 121 is used for the cantilever arms as uplift sections 123, thus reducing the number of components.

[0036] Furthermore, according to the present embodiment, a pair of cantilever arms are provided as upward-pull sections 123 such that they extend parallel to each other, offset from one another, with a fixed end 123a of one of the cantilever arms positioned closer to a free end 123b of the other cantilever arm. In this configuration, the front end 111b of the received puller main body 111 is pushed upward by the two offset cantilever arms. This upward pushing action makes it possible to press the lateral puller projections 112 firmly and uniformly against the lateral receiving projections 122, thus further suppressing abnormal noise.

[0037] Furthermore, according to the present embodiment, the lateral receiving projections 122 and the lateral puller projections 112 are configured such that, in a state where the projections 122 and 112 are locked together, they are positioned between the pair of uplift sections 123 with respect to the arrangement direction D12 of the uplift sections 123. From this perspective as well, the present embodiment allows the lateral puller projections 112 to be pressed firmly and uniformly against the lateral receiving projections 122, thus further suppressing abnormal noises.

[0038] It should be noted that the embodiments described above are merely illustrative embodiments for the structure receiving the fuse puller and the electrical junction box, and that the fuse puller receiving structure and the electrical junction box are not limited to these, but that numerous variations thereof can be implemented.

[0039] The embodiment described above shows, as examples, the puller main body 111 and the puller receiving section 121, wherein both the puller main body 111 and the puller receiving section 121 are made of plastic and have a rectangular tube shape. However, the puller main body and the puller receiving section are not limited to this; any specific suitable shape and / or material properties can be chosen for each of these elements.

[0040] Furthermore, the embodiment described above shows, as an example of the puller receiving section, the puller receiving section 121, which forms part of the receiving element 120 as a separate component of the main body section 1a of the electrical junction box 1. However, the puller receiving section is not limited to this, but can, for example, be formed integrally as part of the main body section of the electrical junction box.

[0041] Furthermore, the embodiment described above shows, as examples of the lateral puller projections and the lateral receiving projections, a pair of lateral puller projections 112 and a pair of lateral receiving projections 122, wherein the pair of lateral puller projections 112 is provided on the gripping elements 111a of the puller main body 111 and the pair of lateral receiving projections 122 is provided on the inner wall surfaces 121a of the puller receiving section 121. However, the lateral puller projections and the lateral receiving projections are not limited to this; any position for forming projections and any number of projections can be selected, which are formed on both the puller main body and the puller receiving section.However, as described above, the puller main body 111 can be held firmly by the puller receiving section 121 by providing a pair of lateral puller projections 112 and a pair of lateral receiving projections 122 on the gripping elements 111a of the puller main body 111 and on the inner wall surfaces 121a of the puller receiving section 121, respectively.

[0042] Furthermore, the embodiment described above shows, as an example of the uplift section, the uplift sections 123, which are designed as cantilever arms. However, the uplift section is not limited to this; any element can be chosen that allows the front end of the puller main body to be pre-tensioned, with the puller main body being received in the puller receiving section, e.g., a coil spring and / or an elastic rubber. As described above, however, the lateral puller projections 112 can be pressed firmly against the lateral receiving projections 122 by using cantilever arms as uplift sections 123, thus further suppressing abnormal noise.

[0043] Furthermore, the embodiment described above shows, as an example of the uplift section, the uplift sections 123, which are cut out of the base 121b of the puller receiving section 121 in the form of cantilevers by forming the C-shaped slots 121b-1 therein. However, even when the uplift section is configured as cantilevers, any specific shape configuration for the uplift section can be chosen, whereby the uplift section can be attached, for example, to an inner wall surface of the puller receiving section as a separate component. As described above, however, the number of components can be reduced by cutting the uplift sections 123 out of the base 121b of the puller receiving section 121 by forming the slots 121b-1 therein.

[0044] Furthermore, the embodiment described above, as an example of the uplift section, shows that a pair of uplift sections 123 are provided as cantilevers extending parallel to each other in an offset manner. However, even when a pair of uplift sections are provided as cantilevers, their arrangement is not limited to configurations in which the uplift sections extend parallel to each other in an offset manner. For example, the pair of uplift sections as cantilevers can be arranged such that they extend parallel to each other, with their free ends aligned and their fixed ends aligned. As described above, however, abnormal noise can be suppressed even further by arranging the pair of uplift sections 123 as cantilevers in a parallel and offset manner, as described above.

[0045] Furthermore, the embodiment described above, as an example of the arrangement of the lateral puller projection, the lateral puller projection, and the lift-up section, shows that the lateral receiving projections 122 and the lateral puller projections 112, which are interlocked, are arranged between the pair of lift-up sections 123. However, the arrangement of the lateral receiving projection, the lateral puller projection, and the lift-up section is not limited to this; for example, the lateral receiving projection and the lateral puller projection can be arranged far from a position between the pair of lift-up sections. As described above, however, abnormal noise can be suppressed even better by arranging the lateral receiving projections 122 and the lateral puller projections 112 between the pair of lift-up sections 123. Reference list 1 Electrical junction box 1a Junction box main body section 10 fuse puller mounting structure 110 fuse pullers 111 Puller main body 111a Gripping elements 111a-1 Gripping claws 111b Front end 112 Lateral puller projections 120 recording element 121 Puller attachment section 121a Interior wall surfaces 121b Floor 121b-1 slots 122 Lateral mounting protrusions 123 uplift sections 123a Fixed ends 123b Free ends D11 insertion direction D12 Arrangement direction D13 Bending direction D14 Upward direction

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