Removable bridge for secure electrical contacts and method of manufacturing the same

Abstract

A detachable connecting bridge (1) for a safety electrical contact, comprising a head (11) made of electrically insulating material and a stem (10) protruding from the head (11) and extending to a front end (3) made of electrically conductive material, wherein a free end portion (3b) of the front end (3) of the stem (10) is provided with a thin layer (13) only at its free end face opposite the head (11).

Description

Technical Field

[0001] This invention relates to a detachable connecting bridge for safety electrical contacts, which conforms to the technical solution described in the preamble of claim 1, and particularly to a detachable connecting bridge applied in safety electrical contacts, such as in elevator structures.

[0002] On the other hand, the present invention also relates to a method for manufacturing the detachable connecting bridge. Background Technology

[0003] In this invention, "electrically insulating material" refers to a material with dielectric properties, that is, a material that cannot conduct electric charge, and therefore can play an electrical insulating role, maintaining its insulating properties even under voltage conditions of about 380V.

[0004] Elevator systems widely employ safety electrical contacts equipped with detachable connecting bridges to disable or enable certain elevator functions. For example, the elevator cannot obtain electrical permission to start if all landing doors and car doors are not closed; or, the landing doors and car doors are prohibited from opening until the car has reached the designated floor.

[0005] In terms of working principle, the activation of this type of safety electrical contact is achieved by inserting the end of a detachable connecting bridge into the electrical contact body. Specifically, the end of the movable connecting bridge is inserted into the electrical contact body through a pre-set insertion path until it makes contact with the electrical contacts located within the electrical contact body, thereby establishing an electrical connection between the electrical contacts and enabling current transmission.

[0006] The performance requirements for safety electrical contacts are typically specified by stringent specifications and standards. For example, it is required that the end of a detachable connecting bridge must be inserted into the receiving part of the contact, and that the circuit is only allowed to close electrically after the mechanism used to achieve mechanical closure has completed its minimum effective stroke (which is typically at least 7 mm).

[0007] Currently, most safety electrical contact structures employing detachable connecting bridges typically include a sheet-like contact spring supporting a circular contact element. This circular contact element is generally fixed to the free end of the spring by riveting and is made of silver or at least has a silver coating. The ends of the detachable connecting bridge form two rod-shaped contact portions that apply pressure to the circular contact element, thereby establishing an electrical connection between the circular contact elements and enabling current conduction between one contact spring and the other.

[0008] Although this type of electrical contact structure has good performance and has been widely used and proven reliable, it still has some drawbacks. The primary issue is the need for a relatively large circular contact element, typically around 7mm in diameter. This larger size is necessary to ensure that even if the removable connecting bridge is not fully aligned or has misalignment when inserted into the safety contact body, the contact point at the end of the connecting bridge can still effectively act on the surface of the circular contact element, thus ensuring reliable electrical contact.

[0009] Furthermore, such contact structures typically need to be fixed to the leaf contact spring by riveting. This means that during manufacturing, the contact elements need to be manufactured separately, through holes need to be machined on the contact spring, and then the corresponding contact elements need to be riveted and fixed at each through hole location. The overall process involves many steps and is relatively complex.

[0010] To overcome the aforementioned problems and simultaneously achieve miniaturization of the safety electrical contact body, an improved solution has been proposed and adopted. This solution employs a safety electrical contact structure with a detachable connecting bridge. In this structure, the electrical contacts that need to make contact and establish an electrical connection no longer use a circular structure, but rather a filamentary or cylindrical structure. This approach reduces the amount of silver or other precious metals used for electrical contacts, thereby lowering material costs.

[0011] However, the improved structure described above requires that the front end of the detachable connecting bridge must have a conductive end face, which must be made of silver or other precious metals used for electrical contacts, or at least coated with such a material, to ensure that the front end of the connecting bridge can reliably contact the filamentary or cylindrical contacts located within the safety electrical contact body in any inserted state. Therefore, conventional connecting bridges with rod-shaped contacts are no longer suitable for this type of structure.

[0012] Therefore, the technical problem to be solved is to provide a detachable connecting bridge whose front contact surface can cover the entire width in the lateral direction, thereby ensuring contact reliability, without using a large amount of silver or other precious metal materials, and without increasing complexity or cost burden in the manufacturing process.

[0013] However, existing detachable connecting bridges with continuous linear front-end contact surfaces cannot meet the above requirements. The main reason is that in order to achieve a firm bond between the front-end silver layer and the main body of the connecting bridge, a thicker silver layer is usually required, which results in a large consumption of precious metal materials. Summary of the Invention

[0014] Based on this, the purpose of the present invention is to propose and provide a detachable connecting bridge for safety electrical contacts. This detachable connecting bridge has specific structural and functional features, which can significantly reduce the amount of silver or other precious metal materials used for electrical contacts while ensuring that the front contact surface extends along the entire front side. Furthermore, it has a simple structure and a quick manufacturing process, thereby effectively reducing production costs.

[0015] The aforementioned technical problem is solved by a detachable connecting bridge for safety electrical contacts, the technical features of which are described in claim 1.

[0016] According to another aspect of the present invention, the above-mentioned technical problem is also solved by a method for manufacturing the detachable connecting bridge, the technical features of which are described in claim 15.

[0017] Other features and advantages of the detachable connecting bridge and its manufacturing method of the present invention will become clearer from the following detailed description of preferred embodiments in conjunction with the accompanying drawings. These embodiments are for illustrative purposes only and do not constitute a limitation on the scope of protection of the present invention. Attached Figure Description

[0018] To facilitate understanding of the present invention, it will now be described in conjunction with the accompanying drawings, wherein: — Figure 1 A three-dimensional structural schematic diagram of a detachable connecting bridge for safety electrical contacts according to the present invention is shown; — Figure 2 It shows Figure 1 The diagram shows a perspective view of a removable connecting bridge portion inserted into a safety electrical contact, wherein the safety electrical contact is shown in a simplified form and its top cover has been removed to show the internal structure of the electrical contact; — Figure 3 It shows Figure 1 A partially enlarged perspective view of the front contact portion of the detachable connecting bridge shown. — Figure 4 It shows the method for forming Figure 3 The material rod of the front contact portion of the detachable connecting bridge shown; — Figure 5 A three-dimensional structural schematic diagram of a detachable connecting bridge for safety electrical contacts according to another embodiment of the present invention is shown; — Figure 6 It shows Figure 1 A partial sectional perspective view of the detachable connecting bridge is shown to reveal its internal structure. — Figure 7 It shows Figure 5 A partially enlarged perspective view of the front contact portion of the detachable connecting bridge shown. — Figure 8 It shows the method for forming Figure 7 The material bar of the front contact portion of the detachable connecting bridge shown. Detailed Implementation

[0019] Referring to the accompanying drawings, the entire design is indicated by reference numeral 1, which denotes a detachable connecting bridge 2 for safety electrical contacts according to the present invention.

[0020] The detachable connecting bridge includes a head 11 and a rod 10 protruding outward from the head, the rod extending along a predetermined longitudinal direction XX between two opposing longitudinal sides 10a, 10b.

[0021] The head 11 of the detachable connecting bridge 1 is made of an electrically insulating material.

[0022] The rod portion 10 includes the following parts: — Rear portion 12, the rear portion being made of an electrically insulating material (e.g., a formable thermoplastic material) and including a rear end portion 12a, wherein the rear end portion is integrally connected to and extends therefrom the head 11, and the front end portion 12b is located on a side away from the head 11. — Front portion 3, which is made of conductive material and extends along the longitudinal direction XX, and includes a rear end portion 3a and a free end portion 3b.

[0023] The front end 12b of the rear part 12 of the rod 10 is inseparably connected to the rear end 3a of the front part 3 of the rod 10, thereby forming an integral structure.

[0024] Furthermore, the free end 3b of the front portion 3 of the rod 10 is covered only at its free end face opposite the head 11 of the detachable connecting bridge 1 with a thin layer 13 made of silver, silver alloy or other precious metal material suitable for electrical contact.

[0025] according to Figures 1 to 3 In the first embodiment of the detachable connecting bridge 1 shown, the front end 12b of the rear portion 12 of the rod 10 and the rear end 3a of the front portion 3 of the rod 10 are inseparably connected to each other by the engagement of complementary contours, the complementary contours forming an inverted snap structure that interlocks with respect to the rod 10 in the longitudinal direction XX in which it extends.

[0026] Preferably, the front part 3 and the rear part 12 of the rod 10 are on path P (see...) Figure 1The ends are connected to each other in an end-to-end contact manner. The path P is defined by the mating end face contours formed by the front end 12b of the rear part 12 and the rear end 3a of the front part 3, thereby forming an undercut structure relative to the longitudinal direction XX. The mating end faces extend from one longitudinal side 10a to the other longitudinal side 10b of the rod 10 in a direction transverse to the longitudinal direction XX.

[0027] Preferably, the path P used to form the inverted structure is composed of a plurality of annular segments, recessed segments, arc segments and / or other curved segments in sequence, and preferably also includes straight segments.

[0028] Preferably, the path (P) forming the inverted structure includes multiple arc segments, each arc segment having a central angle greater than 190°, thereby forming an arc portion larger than a semicircle.

[0029] Preferably, the rear portion 12 of the rod portion 10 is made of a moldable polymer material and is formed on the front portion 3 by injection molding or, more preferably, by overmolding (i.e., overmolding), so that the polymer material fills the undercut structure formed in the rear end portion 3a of the front portion 3, thereby achieving a firm connection between the two.

[0030] Preferably: — The front part 3 of the rod 10 is a thin sheet structure made of conductive material; — The rear part 12 of the rod 10 is a sheet structure made of electrical insulating material. The sheet is connected to each other by end-to-end contact through the matching of complementary contours. The complementary contours form an inverted snap structure that interlocks with the longitudinal direction XX of the rod 10.

[0031] Preferably, the rear portion 12 and the front portion 3 of the rod portion 10 are substantially coplanar, such that the thickness s2 of the sheet forming the front portion 3 of the rod portion 10 is substantially equal to the thickness S of the sheet forming the rear portion 12 of the rod portion 10, for example, the thickness S is less than or equal to 3 mm, preferably the thickness S is less than 2.3 mm, and more preferably the thickness S is equal to 2 mm.

[0032] according to Figures 5 to 8 In the second embodiment of the detachable connecting bridge 1 shown, preferably, the front end 12b of the rear part 12 of the rod 10 and the rear end 3a of the front part 3 of the rod 10 are connected in an inseparable manner by a male-female fit, wherein the male-female fit is provided by complementary engagement elements provided on the front end 12b of the rear part 12 and the rear end 3a of the front part 3, and the complementary engagement elements are interlocked in a direction YY perpendicular to the longitudinal direction XX.

[0033] Preferably, the complementary engagement elements that interlock in a direction YY perpendicular to the longitudinal direction XX include (see...) Figure 6 and Figure 7 ): — Through opening 14, which extends along a direction YY perpendicular to the longitudinal direction XX, and is provided in a portion of the front end portion 12b and the rear end portion 3a; — A corresponding solid element 15, which is used to fill the through opening 14 and is integrally formed with another part of the front end portion 12b and the rear end portion 3a.

[0034] The solid element 15 is embedded in the through opening 14 to form a mating structure, so that the front part 3 and the rear part 12 of the rod 10 are connected in an inseparable manner.

[0035] according to Figure 6 and Figure 7 In the embodiment shown, the detachable connecting bridge 1 conforms to claim 8, wherein: — The through opening 14, which extends along a direction YY perpendicular to the longitudinal direction XX, is provided in the front part 3 of the rod 10, and the front part 3 is made of conductive metal material; — The corresponding solid element 15 for filling the through opening 14 is integrally disposed with the rear portion 12 of the rod portion 10, which is typically made of a formable polymer material.

[0036] Alternatively, through openings can be provided in both the front and rear portions of the rod, and correspondingly, solid elements for filling the through openings can be provided in both the rear and front portions of the rod.

[0037] Preferably: — The front portion 3 of the rod 10 is formed into a sheet made of a conductive material, such as copper, copper alloy and similar material, having a predetermined thickness s1; — The rear portion 12 of the rod 10 forms a layered structure with a predetermined thickness S, which is basically a sheet structure and is made of an electrically insulating material (e.g., a formable polymer material); the rear end portion 3a of the front portion 3 of the rod 10 is preferably embedded in the thickness S of the rear portion 12 in a sandwich form, so that the free end portion 3b of the front portion 3 of the rod 10 extends outward from the rear portion 12 along the longitudinal direction XX.

[0038] Preferably, the rear end portion 3a of the front portion 3 of the rod 10 is embedded in the thickness S of the front end portion 12b of the rear portion 12 of the rod 10, so that the free end portion 3b of the front portion 3 of the rod 10 extends outward from the rear portion 12 along the longitudinal direction XX.

[0039] Preferably, the front end portion 12b of the rear portion 12 of the rod 10 is made of a moldable polymer material and is formed on the rear end portion 3a of the front portion 3 of the rod 10 by overmolding.

[0040] Preferably: — The rear portion 12 of the rod portion 10 forms a layered structure with a predetermined thickness S, wherein the predetermined thickness S is less than or equal to 3 mm, more preferably less than 2.3 mm, and more preferably equal to 2 mm. — The front part 3 of the rod 10 forms a thin sheet structure with a predetermined thickness s1, wherein the predetermined thickness s1 is less than or equal to 1.1 mm, more preferably less than or equal to 0.7 mm, and more preferably equal to 0.6 mm.

[0041] As an alternative to the above embodiments, the same detachable connecting bridge may include both of the above embodiments, thereby enabling the front end portion of the rear part of the rod to be inseparably connected to the rear end portion of the front part of the rod.

[0042] Preferably, in the above two embodiments, the thin layer 13, made of silver, silver alloy or other precious metal material for electrical contact, is applied to the free end 3b of the front part 3 of the rod 10 by welding and / or thermal welding to cover the free end.

[0043] According to another aspect of the present invention, the present invention also relates to a safety electrical contact 2, the safety electrical contact comprising: — Receiver body 4, which is made of electrically insulating material and is used to be mounted on an external support; — Electrical contact element 6, which is disposed within the receiving body 4 and in a protected position and is electrically insulated from each other, and is electrically connected or can be electrically connected to an external electrical conductor; — A longitudinal channel, which is disposed in the receiving body 4 and extends in the longitudinal direction, is used to detachably insert the front part 3 of the rod 10 of the detachable connecting bridge 1 until the front part 3 contacts the electrical contact element 6, thereby establishing electrical conduction between the electrical contact elements 6; — A sheet-like contact spring 7, which supports the electrical contact element 6 and is disposed within the receiving body 4, enabling the electrical contact element 6 to reversibly move within the receiving body 4 to the following positions: ●From the forward position, in which the detachable connecting bridge 1 is not inserted into the receiving body 4, the electrical contact element 6 is substantially located at the corresponding position of the longitudinal channel; ●To the rearward position, in which the detachable connecting bridge 1 is fully inserted into the receiving body 4 through the longitudinal channel, the electrical contact element 6 is pushed backward by the free end of the front part 3 of the rod 10.

[0044] According to the present invention, a method for manufacturing the above-described detachable connecting bridge 1 includes the following steps: — Provide a first sheet or strip 16 made of a conductive material and extending along a major axial direction YY, and including two longitudinal sides spaced apart by a predetermined distance s1 or s2, the predetermined distance corresponding to the thickness of the first sheet or strip 16 and defining two opposing larger surfaces thereon. — Providing a second sheet or strip 13, the second sheet or strip having a thin-layer structure and being composed of a material selected from silver, silver alloys, or other precious metals for electrical contact; the method includes the following steps: — The second sheet or strip 13 is applied to one longitudinal side of the first sheet or strip 16 to obtain a semi-finished product, which is a sheet or strip of conductive material, one longitudinal side of which is covered by the second sheet or strip 13. — The front part 3 of the rod 10 is formed by processing the semi-finished product; — The rear portion 12 of the rod 10 is manufactured so that it is inseparably connected to the front portion 3 of the rod 10, and this connection is achieved in the following manner: ● An undercut structure is formed by the complementary contour fit between the front end portion 12b of the rear portion 12 of the rod 10 and the rear end portion 3a of the front portion 3 of the rod 10, the undercut structure being positioned relative to the longitudinal direction XX of the rod 10; and / or ● The connection is achieved through a male-female fit between the front end 12b of the rear part 12 of the rod 10 and the rear end 3a of the front part 3 of the rod 10, and the complementary engagement elements are interlocked in a direction YY perpendicular to the longitudinal direction XX.

[0045] Preferably, the step of applying the second sheet or strip 13 to the longitudinal side of the first sheet or strip 16 is achieved by rolling and / or welding, that is, fixing the second sheet or strip 13 to the longitudinal side of the first sheet or strip 16 by lamination or welding.

[0046] Preferably, the width of the second sheet or strip 13 is less than or equal to the thickness s1 of the first sheet or strip 16.

[0047] Preferably, the step of forming the front part 3 of the rod 10 from the semi-finished product is achieved by punching, cutting and / or material removal processing.

[0048] The manufacturing of the detachable connecting bridge 1 also includes the step of molding or covering the rear part 12 of the rod 10 onto the front part 3 of the rod 10.

[0049] In the case of the above-described overmolding, where the rear portion 12 of the polymer material is overmolded onto the front portion 3 of the conductive material, preferably, the front portion 3 of the rod portion 10 is provided with an additional through opening 18 (see...). Figure 5 and Figure 6 The through opening 18 is disposed in the front part 3 and is not covered or filled by the polymer material, and is used to clamp and position the front part 3 during the overmolding process.

[0050] As can be seen from the above description, the detachable connecting bridge and its manufacturing method of the present invention can meet the aforementioned technical requirements and overcome the defects of the prior art described in the background section of this specification. Specifically, by providing a thin layer made of silver, silver alloy, or other precious metal materials for electrical contacts, the detachable connecting bridge can meet the requirements of optimal working performance while using this thin layer material only on the front end face of the connecting bridge, thereby limiting the amount of such electrical contact materials, which are more expensive than copper or copper alloys, to a minimum.

[0051] Furthermore, by applying the conductive thin layer to the free end of the rod by welding and / or rolling, the thin layer can be firmly fixed without the need for edging, mechanical fasteners or other fixing structures, and without extending the thin layer to cover the side of the rod.

[0052] Therefore, the detachable connecting bridge according to the present invention can significantly reduce the amount of silver, silver alloy or other precious metal materials for electrical contact while ensuring functional effectiveness and reliability, thereby achieving effective savings in material costs.

[0053] Furthermore, by applying the cover layer to a conductive metal sheet (e.g., a copper or copper alloy sheet) by rolling and / or welding, the detachable connecting bridge can be manufactured on an automated production line, thereby achieving lower production costs.

[0054] Another advantage of the present invention is that it can effectively control the amount of precious metal material applied to the free end of the connecting bridge, thereby avoiding waste and scrap generation of precious metal material.

[0055] Furthermore, the detachable connecting bridge of the present invention has the characteristics of simple structure, which facilitates manufacturing and can ensure a high number of working cycles.

[0056] Obviously, those skilled in the art can make various modifications and variations to the above-mentioned detachable connecting bridge, safety electrical contact and manufacturing method without departing from the scope of protection of the present invention, and all such modifications and variations should fall within the scope of protection of the present invention as defined by the appended claims.

Claims

1. A detachable connecting bridge (1) for safety electrical contacts, the detachable connecting bridge comprising a head (11) and a rod (10) protruding from the head, the rod extending between opposing longitudinal sides (10a, 10b) along a predetermined longitudinal direction (XX), wherein: — The head (11) is made of an electrically insulating material; — The rod (10) includes: ● Rear portion (12), said rear portion being made of electrically insulating material and having a rear end portion (12a) and a front end portion (12b), said rear end portion being integrally connected to and extending from said head (11), said front end portion being located away from said head (11); and ● Front portion (3), said front portion is made of conductive material and extends along said longitudinal direction (XX) from rear end portion (3a) toward free end portion (3b), — The front end (12b) of the rear portion (12) of the rod (10) and the rear end (3a) of the front portion (3) of the rod (10) are inseparably connected to each other. Its features are: —The free end (3b) of the front portion (3) of the rod (10) is covered only with a thin layer (13) on its free end face opposite the head (11), the thin layer being made of a conductive material selected from silver, silver alloys or other precious metals for electrical contact; and — The front end (12b) of the rear portion (12) of the rod (10) and the rear end (3a) of the front portion (3) of the rod (10) are inseparably connected to each other in the following manner: ● An undercut structure is formed by the complementary contour engagement between the front end portion (12b) of the rear portion (12) of the rod (10) and the rear end portion (3a) of the front portion (3) of the rod (10), the undercut structure being disposed relative to the longitudinal direction (XX) of the rod (10); and / or ● The connection is achieved by a male-female fit between the front end (12b) of the rear part (12) of the rod (10) and the rear end (3a) of the front part (3) of the rod (10), the male-female fit including complementary engagement elements, the complementary engagement elements fitting together in a direction (YY) perpendicular to the longitudinal direction (XX).

2. The detachable connecting bridge (1) according to claim 1, characterized in that, The front portion (3) and the rear portion (12) of the rod (10) are connected to each other along a path (P) in an end-to-end contact manner. The path (P) is defined by complementary contours formed by the respective end faces of the front end (12b) of the rear portion (12) and the rear end (3a) of the front portion (3). The complementary contours form the buckle structure, and the end faces extend from one longitudinal side (10a) of the rod (10) to another longitudinal side (10b) in a direction transverse to the longitudinal direction (XX).

3. The detachable connecting bridge (1) according to claim 2, characterized in that, The path (P) forming the inverted structure is composed of a plurality of annular segments, recessed segments, arc segments and / or other curved segments in sequence, and preferably also includes straight segments.

4. The detachable connecting bridge (1) according to claim 3, characterized in that, The path (P) forming the inverted structure includes multiple arc segments, each arc segment having a central angle greater than 190°.

5. The detachable connecting bridge (1) according to any one of claims 1 to 4, characterized in that, The rear portion (12) of the rod (10) is made of a moldable polymer material and is formed on the front portion (3) of the rod (10) to fill the buckle structure disposed in the rear end portion (3a) of the front portion (3).

6. The detachable connecting bridge (1) according to any one of claims 1 to 5, characterized in that: — The front portion (3) of the rod (10) is a sheet of conductive material; and — The rear part (12) of the rod (10) is a sheet of electrical insulating material, which is connected to each other by end face contact through the matching of complementary contours, and the complementary contours form an interlocking inverted structure relative to the longitudinal direction (XX) of the rod (10).

7. The detachable connecting bridge (1) according to any one of claims 1 to 6, characterized in that, The rear part (12) and the front part (3) of the rod (10) are substantially coplanar.

8. The detachable connecting bridge (1) according to any one of claims 1 to 6, characterized in that, The complementary engagement elements, which interlock along a direction (YY) perpendicular to the longitudinal direction (XX), include: — Through opening (14), which extends along the direction (YY) perpendicular to the longitudinal direction (XX) and is located in a portion between the front end (12b) of the rear part (12) of the rod (10) and the rear end (3a) of the front part (3) of the rod (10); — A corresponding solid element (15) is provided to fill the through opening (14) and is integrally formed with another part between the front end (12b) of the rear part (12) of the rod (10) and the rear end (3a) of the front part (3) of the rod (10). The solid element (15) is embedded in the through opening (14) to form a mating structure that makes the front part (3) of the rod (10) and the rear part (12) of the rod (10) inseparable.

9. The detachable connecting bridge (1) according to claim 8, characterized in that: — The through opening (14) extends along the direction (YY) perpendicular to the longitudinal direction (XX) and is disposed in the front part (3) of the rod (10); — The solid element (15) used to fill the through opening (14) is integrally formed with the rear part (12) of the rod (10).

10. The detachable connecting bridge (1) according to any one of claims 8 or 9, characterized in that: — The front part (3) of the rod (10) is a sheet of conductive material with a predetermined thickness (s1); — The rear part (12) of the rod (10) is a layered structure of electrical insulating material with a predetermined thickness (S). The rear end (3a) of the front part (3) of the rod (10) is disposed within the thickness (S) of the rear part (12) of the rod (10), preferably disposed in a sandwich manner, so that the free end (3b) of the front part (3) of the rod (10) extends outward from the rear part (12) along the longitudinal direction (XX).

11. The detachable connecting bridge (1) according to any one of claims 8 to 10, characterized in that, The rear end (3a) of the front part (3) of the rod (10) is embedded in the thickness (S) of the front end (12b) of the rear part (12) of the rod (10), so that the free end (3b) of the front part (3) of the rod (10) extends outward from the rear part (12) along the longitudinal direction (XX). Preferably, the front end (12b) of the rear part (12) of the rod (10) is made of a moldable polymer material and is overmolded onto the rear end (3a) of the front part (3) of the rod (10).

12. The detachable connecting bridge (1) according to claim 10 or 11, characterized in that: — The rear part (12) of the rod (10) is a layered structure with a predetermined thickness (S), the predetermined thickness (S) being less than or equal to 3 mm, preferably less than 2.3 mm, and more preferably equal to 2 mm; — The front part (3) of the rod (10) is a sheet structure with a predetermined thickness (s1), the predetermined thickness (s1) being less than or equal to 1.1 mm, preferably less than or equal to 0.7 mm, and more preferably equal to 0.6 mm.

13. The detachable connecting bridge (1) according to any one of claims 1 to 12, characterized in that, The thin layer (13) is made of a conductive material selected from silver, silver alloy or other precious metal materials for electrical contact, and is fixed to the free end (3b) of the front part (3) of the rod (10) by welding and / or thermal welding to cover it.

14. A safety electrical contact (2), the safety electrical contact comprising: — A receiving body (4), which is made of electrically insulating material and is used to be mounted on an external support; — Electrical contact element (6), the electrical contact element is disposed in the receiving body (4) and disposed in a protected position and electrically insulated from each other, and is electrically connected or can be electrically connected to an external electrical conductor respectively; — A longitudinal channel, which is disposed in the receiving body (4) and extends in the longitudinal direction, for removably inserting into the front part (3) of the rod (10) of the removable connecting bridge (1) according to any one of claims 1 to 13 until the front part (3) contacts the electrical contact element (6), thereby establishing electrical conduction between the electrical contact elements (6); — A sheet-like contact spring (7), which supports the electrical contact element (6) and is disposed within the receiving body (4), enabling the electrical contact element (6) to reversibly move within the receiving body (4) at the following positions: ●From the forward position, in which the detachable connecting bridge (1) is not inserted into the receiving body (4), the electrical contact element (6) is substantially located at the corresponding position of the longitudinal channel; ●To the rearward position, in which the detachable connecting bridge (1) is fully inserted into the receiving body (4) through the longitudinal channel, the electrical contact element (6) is pushed backward by the free end of the front portion (3) of the rod (10).

15. A method for manufacturing a detachable connecting bridge (1) according to any one of claims 1 to 13, the method comprising the following steps: — Provide a first sheet or strip (16) made of a conductive material and extending along a major axial direction (YY), and including two longitudinal sides spaced apart by a predetermined distance (s1; s2), the predetermined distance corresponding to the thickness of the first sheet or strip (16) and defining its two opposing larger surfaces; — Provide a second sheet or strip (13), the second sheet or strip being a thin-layer structure and being made of a conductive material selected from silver, silver alloys or other precious metals for electrical contact; Its features are: — The second sheet or strip (13) is applied to one longitudinal side of the first sheet or strip (16) to obtain a semi-finished product, the semi-finished product being a sheet or strip of conductive material, one longitudinal side of which is covered by the second sheet or strip (13); — The front part (3) of the rod (10) is formed by processing the semi-finished product; — Manufacture the rear portion (12) of the rod (10) so that it is inseparably connected to the front portion (3) of the rod (10), wherein the connection is achieved by means of: ● An undercut structure is formed by the complementary contour engagement between the front end portion (12b) of the rear portion (12) of the rod (10) and the rear end portion (3a) of the front portion (3) of the rod (10), the undercut structure being disposed relative to the longitudinal direction (XX) of the rod (10); and / or ● The connection is achieved by a male-female fit between the front end (12b) of the rear part (12) of the rod (10) and the rear end (3a) of the front part (3) of the rod (10), the male-female fit including complementary engagement elements, the complementary engagement elements fitting together in a direction (YY) perpendicular to the longitudinal direction (XX).

16. The method according to claim 15, characterized in that, The step of applying the second sheet or strip (13) to a longitudinal side of the first sheet or strip (16) is carried out by rolling and / or welding, that is, fixing the second sheet or strip (13) to the longitudinal side of the first sheet or strip (16) by lamination and / or welding.

17. The method according to claim 15 or 16, characterized in that, The width of the second sheet or strip (13) is equal to or less than the thickness (s1) of the first sheet or strip (16).

18. The method according to any one of claims 15 to 17, wherein the step of forming the front portion (3) of the rod portion (10) from the semi-finished product is achieved by punching, cutting and / or material removal processing.

19. The method according to any one of claims 15 to 18, the method comprising the step of overmolding the rear portion of the rod (10) by overmolding the rear portion of the moldable polymer material onto the rear end portion (3a) of the front portion (3) of the rod (10).

Images