Method for manufacturing an insulated screwdriver insert

Abstract

The invention relates to a method for manufacturing an insulated screwdriver insert, comprising the steps of "placing a material," "closing a mold," "injecting a material," "opening the mold," and "sealing," which steps are performed sequentially to produce an insulated screwdriver insert (100). In the step of "placing a material," a screwdriver insert (10) is placed in a mold (20), wherein the screwdriver insert (10) comprises a starting section (101), a middle section (102), and a closing section (103), which are formed by metalworking such that the outer diameter of the starting section (101) is larger than the outer diameters of the middle section (102) and the closing section (103), wherein an end opening (104) is arranged at the end part of the closing section (103).wherein the mold (20) is composed of an upper mold (21) and a lower mold (22), wherein a first cavity (211) is formed inside the upper mold (21) and a second cavity (221) is formed inside the lower mold (22), wherein the upper and the lower mold (21, 22) together form a through-hole (222) at one end into which a locking pin (23) is inserted, wherein a boundary wall (223), a plurality of injection ports (224), a first ejector pin (24) and a second ejector pin (25) are arranged on the lower mold (22).

Description

Technical field

[0001] The invention relates to a method for manufacturing an insulated screwdriver insert, which method achieves a high yield. State of the art

[0002] In DE102016212247A1, an insulated bit for a screwdriver is known. As in Fig. As shown in Figure 2, the insulated bit comprises a metallic bit 1 and an insulating protective section 5. The metallic bit 1 has a bit body 3, a left end 6, and an end face 15, the end face 15 having a recess 23. By overmolding, the insulating protective section 5 forms at least a portion of the bit body 3 and the end face 15 such that the left end 6 can protrude outwards. During the overmolding process to produce the insulating protective section 5, the recess 23 is filled with a circumferential annular wall region 25 such that the insulating protective section 5 is completely bonded to the bit body 3 and the end face 15.

[0003] However, the conventional bit for a screwdriver of the type mentioned above has the following shortcomings. During the overmolding process to manufacture the insulating protective section 5, only the left end 6 can be used for gripping, because the circumferential annular wall area 25 is formed in one piece with the insulating protective section 5 in the recess 23. This results in low stability, so that a significant difference in thickness arises in areas of the insulating protective section 5 because the end face 15 wobbles or tilts slightly. Object of the invention

[0004] The invention is based on the objective of creating a method for manufacturing an insulated screwdriver insert that eliminates the deficiencies mentioned in the prior art. Technical solution

[0005] This problem is solved according to the invention by a method for manufacturing an insulated screwdriver insert with the features of claim 1. Advantageous embodiments are the subject of the dependent claims.

[0006] The invention provides a method for manufacturing an insulated screwdriver insert, comprising the steps of "placing a material," "closing a mold," "injecting a material," "opening the mold," and "sealing," which steps are performed sequentially to produce an insulated screwdriver insert. In the step of "placing a material," a screwdriver insert is placed in a mold, wherein the screwdriver insert comprises a starting section, a middle section, and a closing section, which are formed by metalworking such that the outer diameter of the starting section is larger than the outer diameters of the middle section and the closing section, and an end opening is provided at the end of the closing section.The mold is composed of an upper mold and a lower mold, wherein a first cavity is formed inside the upper mold and a second cavity inside the lower mold. The upper and lower molds together form a through-hole at one end, into which a locating pin is inserted. This pin can be inserted into and withdrawn from both the first and second cavities. At the other end of the lower mold, a raised boundary wall is arranged, and a plurality of injection ports are provided on the bottom of the lower mold, leading into the second cavity. Furthermore, a first ejector pin and a second ejector pin are provided and arranged to extend through the lower mold.When the screwdriver insert is positioned in the second cavity of the lower mold, the first and last sections are supported by the first and second ejector pins in the second cavity, respectively, in such a way that the screwdriver insert is held horizontally, ensuring that the last section remains easily separated from the inner wall of the second cavity. In the "Closing a Mold" step, the upper and lower molds are joined together so that the first and second cavities are connected, thus keeping the middle and last sections likewise separated from the inner wall of the first cavity.By inserting the locking pin through the through-hole into the end opening, the screwdriver bit is firmly supported between the boundary wall and the locking pin, ensuring that the screwdriver bit is held stably in a horizontal position and does not wobble or tilt when the second ejector pin retracts. In the "injecting a material" step, a first insulating material is injected through the injection ports into the first and second cavities in such a way that the middle and end sections in both cavities are completely encased with the first insulating material, thus forming an insulating layer on the middle and end sections.In the "opening the mold" step, the upper and lower molds are separated, the locking pin is retracted, and the first and second ejector pins are raised to allow the screwdriver insert, containing the insulating layer, to be easily removed from the mold. With the locking pin retracted, a hole is created in the insulating layer, which is held in a straight line with the end opening. In the "sealing" step, the end opening and the hole are filled with a second insulating material to form an insulating piece, which seals the opening and the hole. The production of the insulated screwdriver insert is completed by simultaneously encasing the metal middle and end sections with the insulating layer and the sealing piece.

[0007] The inventive method for manufacturing an insulated screwdriver insert is characterized by the following: In the closed mold, the screwdriver insert is pushed by the fixing pin so that it presses firmly against the boundary wall, thereby completely fixing the initial and final sections simultaneously. By fixing both ends at the same time, wobbling or tilting of the screwdriver insert during the injection process is prevented, ensuring that the central and final sections are uniformly encased with the insulating layer, resulting in a high yield. Brief description of the drawings Fig. Figure 1 shows a flow chart of a method according to the invention for manufacturing an insulated screwdriver insert. Fig. Figure 2 shows a perspective view of a screwdriver insert according to the invention. Fig. Figure 3 shows a forming tool and a screwdriver insert according to the invention housed therein in a sectional view. Fig. Figure 4 shows a schematic representation of a closed forming tool with a screwdriver insert according to the invention housed therein in sectional view. Fig. Figure 5 shows a schematic representation of the injection of a material into the mold according to the inventive method. Fig. Figure 6 shows a schematic representation to illustrate that the screwdriver insert is ejected by the ejector pins after the mold is opened. Fig. Figure 7 shows a schematic representation to illustrate that an insulating piece is formed by filling it with a material. Fig. Figure 8 shows a perspective view of a sheathed, insulated screwdriver insert according to the invention. Fig. Figure 9 shows a sectional view of a sheathed, insulated screwdriver insert according to the invention. Fig. Figure 10 shows a schematic representation to illustrate that the insulated screwdriver insert is connected to a tool by means of its end section. Fig. Figure 11 shows a schematic representation of an insulated screwdriver insert according to the invention and a tool in the assembled state. Detailed description of a preferred embodiment

[0008] The following section will explain the tasks, features, and advantages of the present invention in more detail with reference to a detailed description of an exemplary embodiment and the accompanying drawings. However, the invention is not limited to the description of this exemplary embodiment and its illustration in the accompanying drawings.

[0009] As from Fig. As can be seen from Figure 1, the present invention relates to a method for manufacturing an insulated screwdriver insert, comprising the steps "placing a material" (S1), "closing a mold" (S2), "injecting a material" (S3), "opening the mold" (S4), and "sealing" (S5), which steps are carried out sequentially to manufacture an insulated screwdriver insert 100. In step S1, "placing a material," a screwdriver insert 100 is placed in a mold 20, wherein the screwdriver insert 100 comprises a starting section 101, a middle section 102, and a closing section 103, which are formed by metalworking such that the outer diameter of the starting section 101 is larger than the outer diameters of the middle section 102 and the closing section 103, and wherein an end opening 104 is arranged at the end part of the closing section 103 (see also Figure 1). Fig. 2) The mold 20 is composed of an upper mold 21 and a lower mold 22, wherein a first cavity 211 is formed inside the upper mold 21 and a second cavity 221 is formed inside the lower mold 22, wherein the upper and lower molds 21, 22 together form a through-hole 212, 222 at one end, into which a locking pin 23 is inserted, which can be inserted into and withdrawn from the first and second cavities 211, 221. At the other end of the lower mold 22, a raised boundary wall 223 is arranged, wherein a plurality of injection openings 224 are provided on the bottom of the lower mold 22, which lead into the second cavity 221. In addition, a first ejector pin 24 and a second ejector pin 25 are provided and arranged so that they pass through the lower mold 22.When the screwdriver insert 10 is placed in the second cavity 221 of the lower mold 22, the initial section 101 and the final section 103 are each supported by the first and second ejector pins 24, 25 in the second cavity 221 in such a way that the screwdriver insert 10 is held horizontally, so that the final section 103 is easily kept separated from the inner wall of the second cavity 221 (see also . Fig. 3) In step S2 “Closing a mold tool”, the upper and lower molds 21, 22 are placed together so that the first and second cavities 211, 221 are joined, thus keeping the middle section 102 and the end section 103 separated from the inner wall of the first cavity 211. By inserting the locking pin 23 through the through-hole 212, 222 into the end opening 104, the screwdriver bit 10 is firmly supported between the boundary wall 223 and the locking pin 23, ensuring that the screwdriver bit 10 is held stably in a horizontal position (see also Fig. 4) and thus does not wobble or tilt when the second ejector pin 23 retracts. In step S3 “Injecting a material”, a first insulating material 30 is injected into the first cavity 211 and the second cavity 221 via the injection ports 224 in such a way that the central section 102 and the end section 103 in the first and second cavities 221 are completely encased with the first insulating material 30, thereby forming an insulating layer 11 on the central section 102 and the end section 103 (see also Fig. 5) In step S4 “Opening the mold tool”, the upper and lower molds 21, 22 are separated, the locking pin 23 is retracted, and the first and second ejector pins 24, 25 are moved upwards to push the screwdriver insert 10, which is equipped with the insulating layer 11, out of the mold tool 20 without difficulty. When the locking pin 23 is retracted, a bore 111 is created in the insulating layer 11, which is held in a straight line connected to the end opening 104 (see also Fig. 6) In step S5 “Sealing”, the end opening 104 and the bore 111 are filled with a second insulating material 300 to form an insulating piece 12 in the end opening 104 and the bore 111, with which the end opening 104 and the bore 111 are sealed (see also Fig. 7) By completely encasing the central section 102 and the end section 103, which are made of metal, simultaneously with the insulating layer 11 and the insulating piece 12, the manufacture of the insulated screwdriver insert 100 is completed.

[0010] In the method according to the invention, the initial section 101 can optionally be rectangular, slotted or cross-shaped, depending on the connecting element to be driven (e.g. screws, bolts), so that the insulated screwdriver insert 100 clamps the connecting element by means of the initial section 101 and causes it to rotate.

[0011] In the method according to the invention, the final section 103 is a hexagonal drive part onto which a tool 40, such as a socket wrench, can be placed (see also Fig. 10 and Fig. 11).

[0012] In the process according to the invention, the first insulating material 30 is polybutylene terephthalate (PBT).

[0013] In the method according to the invention, the second insulating material 300 is epoxy resin.

[0014] The inventive method for manufacturing an insulated screwdriver insert is characterized by the following. With the mold 20 closed, the screwdriver insert 10 is pushed by the fixing pin 23 so that it presses firmly against the boundary wall 223, thereby completely fixing the initial section 101 and the final section 103 simultaneously. By fixing both ends at the same time, wobbling or tilting of the screwdriver insert 10 during the injection process (step S3) is prevented, ensuring that the central section 102 and the final section 103 are uniformly encased with the insulating layer 11, resulting in a high yield.

[0015] Although the present invention has been described in detail with reference to an exemplary embodiment, it is obvious to those skilled in the art that the invention is not limited to this embodiment, but rather that modifications are possible such that individual features can be omitted or different combinations of features can be implemented, as long as the scope of protection of the appended claims is not exceeded. The disclosure of the present invention includes all combinations of the individual features presented. Reference symbol list 10 screwdriver inserts 100 insulated screwdriver inserts 101 Initial section 102 Middle section 103 Final Section 104 End opening 11 Insulation layer 111 Bore 12 insulating pieces 20 forming tools 21 upper casting mold 211 first cavity 212 Feedthrough hole 22 lower mold 221 second cavity 222 Feedthrough hole 223 Boundary wall 224 Injection port 23 Fixing pin 24 first ejector pin 25 second ejector pin 30 first insulating material 300 second insulating material 40 tools QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] DE 102016212247A1

[0002]

Claims

A method for manufacturing an insulated screwdriver insert, comprising steps “placing a material” (S1), “closing a mold” (S2), “injecting a material” (S3), “opening the mold” (S4), and “sealing” (S5), which steps are carried out sequentially to manufacture an insulated screwdriver insert (100), characterized in that in step (S1) “placing a material,” a screwdriver insert (10) is placed in a mold (20), wherein the screwdriver insert (10) comprises a starting section (101), a middle section (102), and a closing section (103), which are formed by metalworking such that the outer diameter of the starting section (101) is larger than the outer diameters of the middle section (102) and the closing section (103), wherein an end opening (104) is arranged at the end part of the closing section (103).wherein the mold (20) is composed of an upper mold (21) and a lower mold (22), wherein a first cavity (211) is formed inside the upper mold (21) and a second cavity (221) is formed inside the lower mold (22), wherein the upper and the lower mold (21, 22) together form a through-hole (212, 222) at one end, into which a locking pin (23) is inserted, which can be inserted into and withdrawn from the first and the second cavity (211, 221), wherein a raised boundary wall (223) is arranged at the other end of the lower mold (22), wherein a plurality of injection openings (224) are provided on the bottom of the lower mold (22) which lead into the second cavity (221), wherein a first ejector pin (24) and a second ejector pin (25) are provided and arranged so that they pass through the lower mold (22), wherein,when the screwdriver insert (10) is placed in the second cavity (221) of the lower mold (22), the initial section (101) and the final section (103) are each supported by the first and second ejector pins (24, 25) in the second cavity (221) such that the screwdriver insert (10) is held horizontally, so that the final section (103) is easily kept separated from the inner wall of the second cavity (221); that in step (S2) “Closing a mold tool”, the upper and lower molds (21, 22) are placed together so that the first and second cavities (211, 221) are joined together, so that the middle section (102) and the final section (103) are likewise kept separate from the inner wall of the first cavity (211), whereby the locking pin (23) is held over the through hole (212, 222) is inserted into the end opening (104),the screwdriver insert (10) is supported so firmly between the limiting wall (223) and the fixing pin (23) that the screwdriver insert (10) is held stably in a horizontal state and thus does not wobble or tilt when the second ejector pin (23) retracts; that in step (S3) “injecting a material” a first insulating material (30) is injected via the injection ports (224) into the first cavity (211) and the second cavity (221) in such a way that the middle section (102) and the end section (103) in the first and the second cavity (221) are completely encased with the first insulating material (30), thereby forming an insulating layer (11) on the middle section (102) and the end section (103); that in step (S4) “opening the mold” the upper and the lower mold (21, 22) are separated from each other, the locking pin (23) is retracted and the first and the second ejector pins (24,25) are brought upwards to push the screwdriver insert (10) provided with the insulating layer (11) can be easily removed from the forming tool (20), wherein, when the fixing pin (23) is retracted, a bore (111) is formed in the insulating layer (11) which is held in a straight line connected to the end opening 104, and that in step (S5) “Sealing”, the end opening (104) and the bore (111) are filled with a second insulating material (300) to form an insulating piece (12) in the end opening (104) and the bore (111), with which the end opening (104) and the bore (111) are sealed, wherein the central section (102) and the end section (103), which are made of metal, are simultaneously completely encased with the insulating layer (11) and the insulating piece (12), the manufacture of the insulated screwdriver insert (100) is completed. Method according to claim 1, characterized in that the initial section (101) is rectangular, slotted or cross-shaped. Method according to claim 1, characterized in that the final section (103) is a hexagonal drive part. Method according to claim 1, characterized in that the first insulating material (30) is polybutylene terephthalate (PBT). Method according to claim 1, characterized in that the second insulating material (300) is epoxy resin.

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