• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    SCREW EARTH. A ground screw is provided, the conductivity and impermeability of which can be ensured simultaneously when being fixed and in which peeled coating pieces can be retained inside, so as not to be scattered outside. The ground screw (1) is used electrically connected to a joining member (20) in which an insulating film (21) is formed, and is characterized by having a thread part (3) and a head part (2) and being equipped with a projection part (5) protruding from the seating face (4) of the head part and formed with a circular ring shape outside the thread part, capable of peeling off the insulating film.
    公开号:BR112013025508B1
    申请号:R112013025508-0
    申请日:2012-04-04
    公开日:2020-12-08
    发明作者:Nobuhide Suzuki；Nobuyoshi Suzuki；Mitsunari Ono
    申请人:Iwata Bolt Kabushiki Kaisha；
    IPC主号:
    专利说明:

    TECHNICAL FIELD
    [001] The present invention refers to a ground screw, capable of simultaneously fixing an electrical device to a body structure of an automobile or similar and electrically connecting the electrical device to the body structure. BACKGROUND OF THE INVENTION
    [002] A ground screw is used to either attach an electrical device to an automobile chassis frame or similar and electrically connect the electrical device to the chassis structure.
    [003] A fastening method using a conventional ground screw requires the following steps and cost.
    [004] The method removes part of a coating from a structure and fixes an earth plate with a screw. Another method of connecting a ground terminal to a frame with a screw having a notched screw thread is to scrape the liner by screwing the screw into an internal screw thread formed in the frame.
    [005] When such a conventional ground screw is used, the following problems arise. The work to remove the covering and masking parts requires man-hours and deteriorates workability. The use of a ground terminal, a wire and a plate increases the cost. In most cases, several fixing screws are used, which increases the cost even more.
    [006] The conventional method of attaching an electrical device to a body structure of an automobile or similar attaches the electrical device to the body structure, so that the electrical device is electrically connected to the body structure and the gasket of the electrical device and body structure is waterproof. A method mentioned in JP 2009-246740 A electrically connects an electrical device to a body structure, compressing a cushion, serving as an earth electrode, to the body structure and ensures an impermeable joint preventing water infiltration with a non-connecting crest electrical.
    [007] Patent Document: JP2009-246740A DESCRIPTION OF THE INVENTION Problem to be solved by the invention
    [008] To obtain both an electrical connection and a waterproof seal simultaneously using the conventional ground screw, the following problems arise.
    [009] Since the conventional ground screw has an electrical connection function and a waterproof sealing function separately, the electrical connection and waterproof sealing are obtained separately and cannot be achieved simultaneously.
    [0010] Therefore, it is an objective of the present invention to provide a ground screw capable of simultaneously obtaining fixation, electrical connection and impermeable sealing, and to retain fragments removed from a coating, so that the fragments of the coating do not spread. Ways to Solve the Problem
    [0011] The present invention provides a ground screw capable of being electrically connected to a member coated with an insulating film, having a threaded body, a head having a support surface and an annular crest, formed on the support surface of the head, in order to partially surround the threaded body.
    [0012] When the ground screw is turned to tighten, the annular crest protrudes from the support surface of the head, fractures and removes part of the insulating film covering the member and comes into electrical contact with the member. The continuous annular crest can seal an inner part of the annular crest in an impermeable manner. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view of a ground screw of a first embodiment of the present invention; Fig. 2 is a bottom view of the ground screw shown in Fig. 1, as seen from below the threaded body of the ground screw; Fig. 3 is a partially sectional side elevation of the ground screw shown in Fig. 1; Fig. 4 is a fragmentary side elevation of the ground screw shown in Fig. 1, to assist in explaining the function of the ground screw shown in Fig. 1; Fig. 5 is a fragmentary side elevation of a ground screw of a second embodiment of the present invention; Fig. 6 is a fragmentary side elevation of a ground screw of a third embodiment of the present invention; Fig. 7 is a fragmentary side elevation of a ground screw of a fourth embodiment of the present invention; Fig. 8 is a fragmentary side elevation of a ground screw of a fifth embodiment of the present invention; Fig. 9 is a perspective view of a ground screw of a sixth embodiment of the present invention; Fig. 10 is a side elevation of the ground screw shown in Figure 9. Fig. 11 is a diagrammatic view of an external screw thread formed on the ground screw shown in Fig. 9; and Fig. 12 is a view of assistance in explaining the use of the ground screw shown in Fig. 9. BEST MODE FOR CARRYING OUT THE INVENTION
    [0013] A ground screw 1 of a first embodiment of the present invention will be described with reference to Figs. 1 to 4.
    [0014] With reference to Figs. 1, 2 and 3, the ground screw is electrically connected to a member 20 coated with an insulating film 21. The ground screw 1 has a head 2 having a support surface and a threaded body 3. A continuous annular crest is formed on the support surface of the head 2 in order to encircle an upper part of the threaded body 3. The member 20 is made of a metal and is coated with insulating film 21. The ground screw 1 is made of a metal.
    [0015] Fig. 3 shows the positional relationship between the earth screw 1 and the member 20 coated with the insulating film 21. When the earth screw 1 is screwed into a nut 18, the continuous annular crest 5 is pressed against the insulating film 21 When the ground screw 1 is screwed further into nut 18, part of the insulating film 21 in contact with the annular crest 5 is fractured and removed.
    [0016] As shown in Fig. 4, a first annular groove 6 is formed contiguously with the annular crest 5 of the support surface 4 on the outside of the annular crest 5 and a second annular groove 7 is formed contiguously with the annular crest 5 in the support surface 4 on the inner side of the annular ridge 5. The first annular groove 6 and the second annular groove 7 have a trapezoidal cross section expanding downwards.
    [0017] The annular crest 5 has a triangular cross section. The triangular cross section has a first side 8 and a second side 9 diverging from the apex of the triangular cross section. The first side 8 and the second side 9 are on the external side and the internal side, respectively, with respect to the geometric axis of the threaded body 3. The first side 8 is the generator of the internal inclination of the first annular groove 6. The second side 9 is the generator of the external inclination of the second annular groove 7.
    [0018] With reference to Fig. 4, the annular crest 5 comes into direct contact with the member 20 and the ground screw 1 is electrically connected to the member 20 when part of the insulating film 21 is scraped from the annular crest 5. At the same time, a space extending within the annular crest 5 is sealed in an impermeable manner because the annular crest 5 is continuous.
    [0019] The removed fragments 22 of the insulating film 21 scraped by the annular crest 5 of the insulating film 21 are guided by the first side 8 and the second side 9 of the annular crest 5 into the first annular groove 6 and the second annular groove 7, respectively .
    [0020] Once the annular crest 5 protrudes from the support surface 4, the annular crest 5 presses and scrapes the insulating film 21 covering the member 20 and comes into electrical contact with the member 20, when the ground screw 1 is tightened . Since the annular groove 5 is continuous and surrounds the threaded body 3, the space within the annular crest 5 can be sealed in an impermeable manner.
    [0021] The first annular groove 6, formed contiguously with the outer side of the annular crest 5 at the support location 4, can retain fragments 22 of the insulating film 21 scraped by the annular crest 5. Thus, fragments 22 of the scraped insulating film 21 can be prevented from spreading.
    [0022] The second annular groove 7, formed contiguously with the internal inclination of the annular crest 5 of the support place 4, can retain fragments 22 of the scraped insulating film 21 by the annular crest 5. Thus, fragments 22 of the scraped insulating film 21 through the annular crest 5 they can be safely retained on the inner and outer sides of the annular crest 5.
    [0023] The annular crest 5 has a triangular cross section. The first side 8 and the second side 9, diverging from the apex of the triangular cross section, are the generators of the internal inclination of the first annular groove 6 and the external inclination of the second annular groove 7, respectively. Therefore, the fragments 22 of the insulating film 21, scraped by the annular crest 5, are guided safely into the first annular groove 6 and the second annular groove 7, by the internal inclination of the first annular groove 6, defined by the first side 8 and by external inclination of the second annular groove 7, defined by the second side 9, into the first annular groove 6 and the second annular groove 7, respectively.
    [0024] A ground screw 1 of a second embodiment of the present invention will be described with reference to Fig. 5. The ground screw 1 has a head 2 having a bearing surface 4 and a threaded body 3. A continuous annular crest 5 it is formed on the support surface 4 in order to partially surround the threaded body 3. The ground screw 1 of the second embodiment has no parts corresponding to the first annular groove 6 and close to the annular crest 5.
    [0025] If an insulating film 21 covering the member 20 is very thin, the amount of fragments 22 of the insulating film 21, which can be scraped, is small and the fragments 22 will not cause problems even if the fragments 22 are not prevented from spreading . In such a case, the ground screw 1 of the second embodiment, provided only with the annular ridge 5 and having a simple shape, is functionally effective.
    [0026] The ground screw 1 of the second embodiment can be easily manufactured and can obtain both an electrical connection and a waterproof seal when it is tightened.
    [0027] A ground screw 1 of a third embodiment of the present invention will be described with reference to Figure 6. The ground screw 1, of the third embodiment, has a head 2 having a support surface 4, provided with a crest ring 5 and a first ring groove 6 and is not provided with any part corresponding to the second ring groove shown in Fig. 3.
    [0028] When the insulating film 21, covering the member 20, is comparatively thin and the amount of fragments 22 of the insulating film 21, scraped is negligibly small, the fragments 22 of the insulating film 21 are not left without collecting and are retained only in the first annular groove 6.
    [0029] The ground screw 1, of the third embodiment, can be comparatively easy to manufacture, can achieve both electrical connection and waterproof sealing when it is tightened and can retain fragments 22 of the scraped insulating film 21 in the third annular groove 6.
    [0030] A ground screw 1 of a fourth embodiment of the present invention will be described with reference to Fig. 7. The ground screw 1 of the fourth embodiment has a head 2 having a bearing surface provided with an annular crest 5 and a threaded body 3. A first annular groove 6 is formed on the support surface of the head 2. The support surface has an outer part 10 extending on the outer side of the first annular groove 6 and an inner part 11 extending on the outer side of the first annular groove 6. The outer part 10 has a height with respect to a direction perpendicular to the geometric axis of the threaded body 3 and containing the tip of the threaded body 3 higher than that of the inner part 11. Therefore , a gap 12 is formed between the inner part 11 of the support surface 2 and an insulating film 21, when the ground screw 1 is tightened.
    [0031] When the ground screw 1 is threaded, the outer part 10 of the support surface, extending out of the annular crest 5, and the first annular groove 6 first come into contact with the insulating film 12. Consequently, the part wide outer 10 of the support surface presses the insulating film 21.
    [0032] Thus, the infiltration of moisture outside the ground screw can be avoided. Therefore, the annular ridge 5 can roughly obtain airtight seal and the outer part 10 of the support surface can obtain airtight seal even more effectively.
    [0033] A ground screw 1 of a fifth embodiment of the present invention will be described with reference to Fig. 8. The ground screw 1 of the sixth embodiment has a head 2 having a support surface 4. The support surface 4 it is provided with an annular crest 5 and a secondary annular crest 13 surrounding the annular crest 5. The secondary annular crest 13 has a lower height than that of the annular crest 5.
    [0034] The secondary annular crest 13 cuts partially or totally inside the insulating film 21 to obtain airtight seal. At the same time, the annular ridge 5 cuts entirely within the insulating film 21, to ensure even more watertight sealing.
    [0035] A ground screw 15 of a sixth embodiment of the present invention will be described with reference to Figs. 9 to 11.
    [0036] With reference to Figs. 9 and 10, the ground screw 15 of the sixth embodiment has the same shape as the ground screw 1 of the first embodiment, however the ground screw 15 has a threaded body 3 having a screw thread provided with several projections 17 projecting radially out from the crest 16 of the screw thread. The projections 17 are formed on the crest 16 of the screw thread. Thus, the projections 17 are arranged in a revolution around the geometric axis of the threaded body 3.
    [0037] The various projections 17 are formed at intervals on the crest 16 of each turn of the screw thread. As shown in Figs. 9 and 10, the projections 17 are arranged in a loop around the geometric axis of the threaded body 3. The projections 17 are protuberances 17b formed on opposite sides of each of the depressions 17a formed by pressing parts of the crest 16 of the screw thread of the body threaded 3.
    [0038] Fig. 11 is an enlarged half longitudinal section of the threaded body 3 of the ground screw 15. A member provided with an internal screw thread is shown in combination with the threaded body 3 of the earth screw 15 of Fig. 11, for facilitate understanding. It is indicated in 3a the geometric axis of the threaded body 3, in 32 the root of the screw thread of the threaded body 3, in 30 the root of the internal screw thread formed inside the member and in 31 the crest of the internal screw thread formed inside of the member.
    [0039] The protrusions 17 (the depressions 17a and the protrusions 17b) formed on the crest of a turn of the screw thread and those formed on the crest of the adjacent turn of the screw thread are shown typically equal.
    [0040] When the ground screw 15 is threaded on a nut 18 shown in Fig. 12, the projections 17 scrape a second insulating film formed on the screw thread of the nut 18.
    [0041] Fig. 12 shows the ground screw 15 in use by way of example, in which the thickness of an insulating film 21 and the height of the annular crest 5 are exaggerated. The insulating film 21 and an insulating film 22 are formed on the opposite surfaces, respectively, of a first member 20. An external insulating film 24 and an internal insulating film 25 are formed on the opposite surfaces, respectively, of a second member 23. The film external insulator 24 is formed after conductively connecting a nut 18 to the second member 23 by welding and coating the external surface of the second member 23 with an insulating material. The inner screw thread of nut 18 is coated with an insulating film that is the same as the outer insulating film 24 during a coating process to form the outer insulating film 24. The insulating film covering the inner thread of nut 18 blocks contact of nut 18 with the threaded body 3 of the ground screw 15.
    [0042] Suppose that the first member 20 and the second member 23 are to be joined together with the ground screw 15 and the nut 18 under such circumstances. Suppose that the insulating film 21 of the first member 20 to be exposed to ambient conditions needs to be watertight and the first member 20 and the second member 23 need to be electrically connected. When the first member 20 and the second member 23 are simply brought into contact, the insulating films 22 and 25 prevent electrical contact between the first member 20 and the second member 23. Since the internal screw thread of nut 18 is coated with a coating process with the insulating film which is the same as the external insulating film 24, the ground screw 15 and the nut 18 cannot simply be electrically connected.
    [0043] When the screw thread of the ground screw 15 and the internal screw thread of the nut 18 are engaged, the projections 17, formed on the crest of the screw thread of the threaded body 3, in order to be arranged on a close turn of the geometric axis of the threaded body 3, they can certainly scrape the insulating film by coating the internal screw thread of nut 18.
    [0044] The annular crest 5 of the ground screw 15 makes electrical contact with the first member 20 and isolates the threaded body 3 of the ground screw 15 from the environment of the first insulating film 21 in a watertight mode.
    [0045] The projections 17 scrape the second insulating film 24 covering the internal screw thread of the nut 18 to obtain the electrical contact of the ground screw 15 with the nut 18.
    [0046] The annular crest 5 and the first member 20 are electrically connected, the threaded body 3 and the internal thread of the nut 18 are electrically connected as indicated by an arrow 19 and the nut 18 is welded on the second member 23. Therefore, the first member 20 and second member 23 are undoubtedly electrically connected.
    [0047] Since the ground screw 15 has the annular crest 15 and the projections 17, the ground screw 15 can obtain the necessary watertight sealing of the first member 20 and the electrical connection of the first member 20 and the second member 23.
    [0048] Although it is described by way of example that the ground screw 15 of the sixth embodiment is obtained by adding the projections 17 to the ground screw 1 in the first embodiment, the ground screw 15 of the sixth embodiment can be obtained adding the projections 17 to any of the ground screws of the second to fifth embodiments.
    [0049] The ground screw of any of the preceding embodiments is provided on the support surface of the head with the first annular groove contiguously surrounding the annular crest. Therefore, fragments of the insulating film scraped by the annular crest can be retained within the first annular groove and, as a result, the scraped fragments of the insulating film can be prevented from spreading.
    [0050] Since the ground screw is provided on the support surface of its head on the inner side of the annular crest with the second annular groove contiguously formed with the annular crest, the fragments of the insulating film scraped by the annular crest can undoubtedly be retained in the first and second annular grooves on the outside and inside of the annular crest.
    [0051] The first part of the support surface protrudes more than the second part of the support surface, towards a plane perpendicular to the geometric axis of the threaded body and containing the tip of the threaded body 3. Therefore, the outer part of the support surface can increase the hermetic sealing effect of the annular crest even more.
    [0052] The annular crest has a triangular cross section. The triangular cross section has the first and second sides diverging from the apex of the triangular cross section. The first side is the generator of the internal inclination of the first annular groove. Therefore, the fragments of the insulating film scraped by the annular crest can certainly be guided into the first annular groove by the internal inclination of the first annular groove defined by the first side.
    [0053] The annular crest has a triangular cross section. The triangular cross section has the first and second sides diverging from the apex of the triangular cross section. The first side is the generator of the internal inclination of the first annular groove and the second side is the generator of the external inclination of the second annular groove. Therefore, the fragments of the insulating film scraped by the annular crest can certainly be guided into the first annular groove by the internal inclination of the first annular groove defined by the first side and into the second annular groove by the external inclination of the second annular groove defined by the second side .
    [0054] The head of the ground screw is provided on its support surface with the annular crest and the secondary annular crest surrounding the annular crest. The secondary annular crest has a smaller height than the annular crest. The secondary annular ridge partially or totally digs the insulating film 21 to obtain airtight seal. At the same time, the annular ridge digs fully into the insulating film to obtain electrical contact and to ensure even more hermetic sealing.
    [0055] The screw thread of the threaded body is provided with the protrusions projecting radially outward from the crest of the external screw thread of the threaded body and capable of scraping part of the second insulating film formed on the second member and covering the screw thread internal nut. Thus, the ground screw can obtain electrical contact with the nut. Consequently, the first and second members, joined together by the ground screw and the nut, can be electrically connected through the annular crest and the projections formed on the screw thread of the threaded body.
    [0056] The projections are formed inside the crest of each turn of the external screw thread of the threaded body and are arranged on a turn close to the geometric axis of the threaded body. Thus, the second insulating film covering the inner screw thread of the nut can certainly be removed by the projections formed on the crest of the screw thread of the threaded body.
    [0057] The projections are formed by compressing the parts of the crest of the screw thread, in order to project outwards on the opposite sides of each of the compressed parts. Thus, protrusions can easily be formed by simply pressing on the crest parts of the outer screw thread.
    权利要求:
    Claims (8)
    [0001]
    1. Ground screw (1) capable of making electrical contact with a coated member (20) with an insulating film (21), said ground screw (1) having a head (2) and a threaded body (3), characterized by fact that an annular crest (5), capable of scraping the insulating film (21), is formed on the support surface (4) of the head (2), in order to surround the threaded body (3), in which a first annular groove (6), capable of retaining fragments of the scraped insulating film (21) by the annular crest (5), is formed on the support surface (4) of the head (2) contiguously with the outer side of the annular crest (5), the threaded body (3) is provided with protrusions (17) projecting radially out of the ridges of the screw thread turns and capable of scraping a second insulating film (24) covering the internal screw thread of a nut (18) with that the threaded body (3) is to be engaged and when the ground screw (1) is turned for tightening, the annular crest (5), projecting from the support surface (4) of the head (2), it fractures and removes part of the insulating film (21) covering the member (20) and the continuous annular crest seals an inner part of the annular crest (5) in an impermeable manner.
    [0002]
    Ground screw (1) according to claim 1, characterized in that a second annular groove (7), capable of retaining fragments (22) of the insulating film (21) scraped by the annular crest (5), is formed on the support surface (4) of the head (2) contiguously with the inner side of the annular crest (5).
    [0003]
    Ground screw (1) according to claim 1, characterized in that an external part of the support surface (4) extending outside the first annular groove (6) projects more than an internal part of the surface of support (4) extending into the first annular groove (6), towards a plane perpendicular to the geometric axis of the threaded body (3) and containing the tip of the threaded body (3).
    [0004]
    Ground screw (1) according to claim 1, characterized in that the annular ridge (5) has a triangular cross section, a first side (8) of the triangular cross section on one side of the apex of the triangular cross section the generator of the internal inclination of the first annular groove (6).
    [0005]
    Earth screw (1) according to claim 2, characterized in that the annular crest (5) has a triangular cross section, a second side (9) of the triangular cross section on the other side of the apex of the triangular cross section the generator of the external inclination of the second annular groove (7).
    [0006]
    Ground screw (1) according to claim 1, characterized in that a secondary annular crest (13) of a height less than the annular crest (5) is formed on the support surface (4).
    [0007]
    7. Ground screw (1) according to claim 1, characterized in that the projections (17) are formed on the crest (5) of each turn of the screw thread, in order to be arranged in a turn around the geometric axis of the threaded body (3).
    [0008]
    8. Ground screw (1) according to claim 1, characterized by the fact that the projections (17) are protuberances (17b) formed on the opposite sides of each of the depressions formed, respectively, by pressing the parts of the crest of each turn of the screw thread of the threaded body (3).
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    法律状态:
    2018-12-18| B06F| Objections, documents and/or translations needed after an examination request according art. 34 industrial property law|
    2019-09-03| B06U| Preliminary requirement: requests with searches performed by other patent offices: suspension of the patent application procedure|
    2020-05-26| B06A| Notification to applicant to reply to the report for non-patentability or inadequacy of the application according art. 36 industrial patent law|
    2020-09-15| B09A| Decision: intention to grant|
    2020-12-08| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 04/04/2012, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2011083662A|JP5653824B2|2011-04-05|2011-04-05|Earth bolt|
    JP2011-083662|2011-04-05|
    PCT/JP2012/059220|WO2012137831A1|2011-04-05|2012-04-04|Earth bolt|
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