Door latch bolt

Abstract

The utility model provides a need not be provided with the flange part of the striker before the leg part of the rod is penetrated in the bottom plate and is fixed through cold riveting. The striker for door latch includes: the bottom plate is fixed in the striker installation surface; the rod is in Japanese hiragana shape, has a pair of leg parts that can be engaged with the door latch and the bottom part between the pair of leg parts, the bottom plate has the leg part fixed hole for the leg part of the rod to penetrate and fix, the inner diameter of the leg part fixed hole is equal to or larger than the outer diameter of the leg part, the part of the leg part of the rod that penetrates from the front side of the leg part fixed hole and protrudes from the back side of the leg part fixed hole is cold riveted to form the riveting part that is larger than the inner diameter of the leg part fixed hole on the back side of the bottom plate, on the front side of the bottom plate, the flange part that is larger than the inner diameter of the leg part fixed hole and larger than the outer diameter of the leg part is formed on a part of the leg part, the riveting part and the flange part clamp the bottom plate, the leg part has the flange part and the engagement part that can be engaged with the door latch, the engagement part is in the position that is closer to the bottom part side than the flange part.

Description

Technical Field

[0001] This utility model relates to a door bolt for holding a door in a closed position by engaging with a door latch provided on a car door, and particularly to a door bolt for which a riveted portion and a flange portion are formed in one step on the leg of the rod during the manufacturing stage, thereby reducing power consumption and thus expecting a reduction in CO2 emissions, and utilizing superior materials in terms of improved strength and recyclability. Background Technology

[0002] Previously, as a striking pin device that engages with a latching device to maintain the closure of a door, it is known to be manufactured by inserting the end of a rod into a base plate and cold riveting it, as in Patent Documents 1 and 2. However, this requires machining a pre-set flange, which is problematic not only in terms of manufacturing costs but also from the perspective of reducing electricity consumption and CO2 emissions, i.e., the Sustainable Development Goals (SDGs).

[0003] Furthermore, structures like those in Patent Document 3 that do not pre-set a flange are also known. However, the end of the rod (ring region 5) is machined into a tapered (truncated cone) shape, and to correspond with this, the hole (through hole 3) for inserting the rod into the base plate is also machined into a tapered (conical) shape. Therefore, in addition to the aspect of manufacturing cost, there are still problems from the viewpoint of reducing power consumption and CO2 reduction (SDGs).

[0004] Regarding reductions in electricity consumption and improvements in recycling, we recognize the importance of promoting these activities from the perspective of environmental concerns and the Sustainable Development Goals (SDGs).

[0005] The Sustainable Development Goals (SDGs) are international goals outlined in the "2030 Agenda for Sustainable Development," adopted at the United Nations Summit, aimed at creating a better, more sustainable world by 2030. The SDGs consist of 17 targets. Regarding the reduction of electricity consumption, as a response to Target 7 (Energy) "Clean access to energy for all," this is a response related to achieving the SDGs. Furthermore, regarding improvements in recycling, as a response to Target 12 (Sustainable consumption and production) "Ensuring sustainable patterns of production and consumption," this is also a response related to achieving the SDGs. Moreover, regarding Target 13 (Climate Change) "Concrete measures to address climate change," the reduction in CO2 emissions that can be expected along with the reduction in electricity consumption is considered a response that contributes to achieving the SDGs.

[0006] Existing technical documents

[0007] Patent documents

[0008] Patent Document 1: Japanese Patent No. 2935812

[0009] Patent Document 2: Chinese Invention Patent Application Publication No. 114144562

[0010] Patent Document 3: German Invention Patent Application Publication No. 102016110688 Utility Model Content

[0011] Problems to be solved by utility models

[0012] The firing pins described in Patent Documents 1 and 2 require the fabrication of flanges on both legs of the rod before they are fixed to the base plate, which could be improved in terms of power consumption and CO2 reduction. In view of the above problems, the present invention aims to provide a firing pin that eliminates the need for flanges on both legs of the rod.

[0013] In addition, the rod of the firing pin is usually made of high-strength steel (chromium-molybdenum steel). Because chromium-molybdenum steel contains a considerable amount of chromium and molybdenum added to the iron used as the base material, chromium and molybdenum must be introduced into the slag as impurities and removed during the recycling of the iron, which is the main component. To improve iron recycling, it is preferable to keep the amount added low. In view of the above problems, the present invention aims to provide a high-strength steel with a lower amount added as an alloying component for the rod.

[0014] Solution for solving the problem

[0015] According to this utility model, the above problems are solved as follows.

[0016] The first technical solution is a bolt for a door latch, characterized in that...

[0017] The bolt for the door latch includes: a base plate fixed to the bolt mounting surface; and a rod shaped like the Japanese katakana character コ, having a pair of legs capable of engaging with the door latch and a bottom located between the pair of legs.

[0018] The base plate has leg fixing holes for the legs of the rod to pass through and be fixed.

[0019] The inner diameter of the leg fixing hole is equal to or larger than the outer diameter of the leg.

[0020] By cold riveting the portion of the rod's leg that extends through the front side of the leg fixing hole and protrudes from the back side of the leg fixing hole, a riveting portion larger than the inner diameter of the leg fixing hole is formed on the back side of the base plate. On the front side of the base plate, a flange portion larger than both the inner and outer diameter of the leg is formed on a portion of the leg. The riveting portion and the flange portion clamp the base plate.

[0021] The leg has the flange portion and the engaging portion capable of engaging with the latch.

[0022] The engaging portion is located closer to the bottom side than the flange portion.

[0023] Since the engagement part that engages with the latch can be ensured at the leg of the rod, and the riveting part and flange part that function to prevent the leg of the rod from detaching from the base plate can be formed in one step, the number of manufacturing steps of the firing pin 1 can be reduced, thereby reducing costs.

[0024] According to the bolt for the door latch described in (1) above, the second technical solution is characterized in that the leg fixing hole of the base plate is formed by a straight hole, and the front end to the end of the leg of the rod are all formed with the same diameter.

[0025] Since there is no need to process the fixing holes and legs, the number of manufacturing steps for the firing pin 1 can be reduced, thus reducing costs. Furthermore, by making the ends of the legs straight, it is easier to achieve a larger amount of flattening (riveting) during riveting, which can firmly hold the rod to the base plate and contribute to improved reliability.

[0026] According to the bolt for the door latch described in (1) above, the third technical solution is characterized in that the front side of the leg fixing hole of the base plate is formed by a tapered hole, and the front end of the leg of the rod is formed with the same diameter up to the end.

[0027] By incorporating a tapered shape in the mounting holes of the base plate, the rod is easily guided into the holes when set in the fixture, thus improving workability. Furthermore, by plastically deforming the legs on the front side along the tapered shape during riveting, the rod can be held more firmly to the base plate, further contributing to improved reliability.

[0028] According to the bolt for the latch described in (2) or (3) above, the fourth technical solution is characterized in that a curved portion is formed between the engaging portion and the flange portion of the leg.

[0029] By setting the curved section, even if a load is generated by pulling the striker with a latch, the load will be distributed and the load can be reliably borne.

[0030] According to the bolt for the door latch described in (1) above, the fifth technical solution is characterized in that the leg fixing hole has a shearing surface and a fracture surface formed by shearing the base plate.

[0031] The thickness of the sheared surface in the thickness direction of the base plate is at least 1 / 2 of the thickness of the base plate.

[0032] A thicker, or longer, sheared surface results in a higher degree of fit between the leg and the sheared surface. However, extending the sheared surface requires expensive processing such as precision stamping, which is detrimental to cost reduction. Adjusting the length of the sheared surface to achieve the appropriate degree of fit can help reduce costs.

[0033] According to the bolt for the door latch described above (1), the sixth technical solution is characterized in that, when the riveting portion and the flange portion are formed on the leg by cold riveting, the die supporting the front side of the base plate holds the engaging portion, and a space is provided near the leg on the front side of the base plate of the die and which is continuous with the front side of the base plate.

[0034] By setting the die with the shape described above, the riveting part and the flange part that function to prevent the rod from detaching from the base plate can be formed in one step, thereby reducing the number of manufacturing steps for the firing pin 1 and reducing costs.

[0035] Effects of the utility model

[0036] According to the bolt for door latches of this invention, even without pre-setting a flange on the front side of the base plate of the rod, the rod can be fixed by clamping the base plate with the riveted portion and the flange portion formed after cold riveting. Therefore, CO2 emissions can be reduced as electricity consumption is reduced, and costs can be lowered. Thus, regarding SDG objective 13 (climate change), a reduction in CO2 emissions due to reduced electricity consumption can be expected, and therefore it can be considered a measure that contributes to the achievement of the objective. Attached Figure Description

[0037] Figure 1 This is a perspective view of one embodiment of the bolt for a door latch according to the present invention.

[0038] Figure 2 yes Figure 1 The front view of the latch using the striking pin.

[0039] Figures 3(a) to 3(c) yes Figure 1 Assembly process diagram of the bolt for the door latch.

[0040] Figures 4(a) to 4(c) This is an assembly process diagram showing the case where the leg fixing hole of the bolt for the door latch of this utility model is a straight hole.

[0041] Figures 5(a) to 5(c) This is an assembly process diagram showing the case where the leg fixing hole of the bolt for the door latch of this utility model is a tapered hole.

[0042] Figure 6 This diagram shows the die held in place on the front side of the base plate during cold riveting when the leg fixing hole is a straight hole.

[0043] Figure 7 This diagram shows the die held in place on the front side of the base plate during cold riveting when the leg fixing hole is a tapered hole.

[0044] Explanation of reference numerals in the attached figures

[0045] 1. Strike pin; 2. Base plate; 3. Rod; 4. Leg fixing hole; 5. Strike pin mounting hole; 21. Upward bending part; 31. Leg; 32. Bottom; 33. Riveting part; 35. Engaging part; 37. Flange part; 41. Shearing surface; 42. Fracture surface; 43. Straight shearing surface; 44. Fracture surface; 45. Conical shearing surface; 46. Fracture surface; 51. Die cavity; 51R. Die cavity corner; D. Strike pin mounting surface; d1. Outer diameter of leg; d2. Inner diameter of leg fixing hole; L. Latch; l. Thickness of shearing surface; R. Curved part; S. Allowable space for variable shape; SP. Space part; t. Thickness of base plate. Detailed Implementation

[0046] Hereinafter, one embodiment of the present invention will be described with reference to the accompanying drawings. Furthermore, the present invention is not limited to the embodiments described below, but also includes appropriate modifications that can be understood by those skilled in the art based on the following embodiments.

[0047] Furthermore, in this instruction manual, the side of the base plate 2 opposite to the side facing the firing pin mounting surface D is designated as the front side, and the side facing the firing pin mounting surface D is designated as the back side (see reference). Figure 2 ).

[0048] like Figure 1 and Figure 2 As shown, the door bolt 1 of this embodiment functions to keep the door in a closed position by engaging with the door bolt L mounted on the door of the vehicle body via a bolt mounting surface D on the vehicle body. The bolt 1 has: a base plate 2 fixed to the bolt mounting surface D of the vehicle body; and a rod 3, which is shaped like a katakana character and has a pair of legs 31, 31 capable of engaging with the door bolt L and a bottom 32 connecting the pair of legs.

[0049] The base plate 2 is roughly elliptical in plan view. An upwardly bent portion 21 is formed on the front side of the base plate 2 where the two legs 31 of the rod 3 are fixed. A variable allowable space S is formed between this upwardly bent portion 21 and the firing pin mounting surface D. This variable allowable space S continuously opens along the line connecting the two ends of the pair of legs 31, 31 that pass through the pair of leg fixing holes 4, 4. With such a variable allowable space S, when a tensile load is applied to the rod 3, the base plate 2 compresses the allowable space S and deforms towards the firing pin mounting surface D. As a result, the tensile load applied to the rod 3 is mitigated, and the rod 3 is less prone to breakage.

[0050] The base plate 2 is fixed to the striker mounting surface D by countersunk screws (not shown) passing through a set of striker mounting holes 5, 5. The rod 3 clamps and fixes the base plate 2 by passing the ends of a pair of legs 31, 31 through a set of leg fixing holes 4, 4 provided on the base plate 2, forming a pair of riveting portions 33, 33 on the back side of the base plate and a pair of flange portions 37, 37 on the front side of the base plate. According to the striker for a door latch of this invention, even without pre-setting flange portions on the front side of the base plate 2 of the rod 3, the rod 3 can be fixed to the base plate after cold riveting. Therefore, CO2 can be reduced by reducing power consumption, and costs can be lowered.

[0051] The base plate 2 is made of ordinary steel such as SS material (rolled steel for ordinary structures) and SPH material (hot rolled steel plate), while the rod 3 is made of high-strength steel such as chromium molybdenum steel (SCM material) and boron steel.

[0052] Figures 3(a) to 3(c) Figure 3(a) shows an assembly process diagram of one embodiment of the bolt for a door latch according to the present invention. Figure 3(a) shows the base plate 2 and the rod 3 constituting the bolt 1. As described above, the base plate 2 is composed of leg fixing holes 4, bolt mounting holes 5, etc., and the rod 3 is composed of a pair of legs 31 and a bottom 32 connecting the pair of legs, etc. The bolt 1 is formed by passing the pair of legs 31 of the rod 3 through the pair of leg fixing holes 4 provided in the base plate 2.

[0053] In this invention, the legs 31 of the rod 3 are all constructed with the same outer diameter d1 up to their front ends. Therefore, the inner diameter d2 of the leg fixing hole 4 provided in the base plate 2 through which the legs 31 pass is equal to or larger than the outer diameter d1 of the legs. The leg fixing hole 4 is formed by a shearing process such as stamping, and is composed of a sheared surface 41 and a fracture surface 42 that is rougher than the sheared surface. Through the shearing process, a cone shape with a predetermined angle is formed on the fracture surface 42.

[0054] Figure 3(b) shows the state in which the front ends of a pair of legs 31 pass through a pair of leg fixing holes 4. In this state, it is used as if... Figure 6 , Figure 7As will be explained later, a die (mold) 51 is installed on each of the pair of legs 31, which contacts the front of the base plate 2 and holds the outer periphery of the engaging portion 35 of the legs 31. By installing the die 51, a flange portion 37 can be provided on the front side of the base plate 2, which is larger than the inner diameter d2 of the leg fixing hole 4 due to the plastic flow generated by the cold riveting of the legs (see Figure 3(c)).

[0055] Figure 3(c) shows the striker 1 after cold riveting, with the front ends of a pair of legs 31 passing through a pair of leg fixing holes 4 as in Figure 3(b). The striker 1 is formed by clamping the base plate 2 with a riveting portion 33 provided on the back side of the base plate 2 and a flange portion 37 provided on the front side of the base plate 2, thereby forming a striker 1 that is firmly joined by the base plate 2 and the rod 3. Each pair of legs 31 has an engaging portion 35, which functions to keep the door in the closed position by engaging with the latch L.

[0056] Since the engaging part 35 that engages with the latch L can be ensured at the leg 31 of the rod 3, and the riveting part and flange part that function to prevent the leg 31 of the rod 3 from detaching from the base plate 2 can be formed in one step, the number of manufacturing steps of the firing pin 1 can be reduced, thereby reducing costs.

[0057] Figures 4(a) to 4(c) The diagram shows the assembly process when the leg fixing hole 4 in the bolt 1 of this invention is a straight hole. As shown in Figure 4(a), the thickness (length) l of the straight shear surface 43, which is formed during the shearing process of the leg fixing hole 4, is at least 1 / 2 or more of the plate thickness t of the base plate 2. In addition, the straight shear surface 43 is solidified by the shearing process. The longer the straight shear surface 43, the higher the tightness of the fit between the leg 31 and the straight shear surface 43, but in order to extend the shear surface, expensive processing such as precision punching is required, which is not conducive to cost reduction. Adjusting the length of the straight shear surface 43 to obtain an appropriate tightness can help reduce costs.

[0058] As shown in Figure 4(a), the legs 31 of the rod 3 of this invention are all constructed with the same straight outer diameter d1 up to the front end. Therefore, the inner diameter d2 of the leg fixing hole 4 provided on the base plate 2 through which the leg 31 passes is equal to or larger than the outer diameter d1 of the leg.

[0059] Figure 4(b) shows the state in which the front ends of a pair of legs 31 pass through a pair of leg fixing holes 4. Since the front ends of the legs 31 are straight, if cold riveting is performed in this state, it is easy to obtain a large amount of flattening (riveting) during riveting, and to form a large riveting part 33 on the back side of the base plate 2, thereby firmly holding the rod 3 to the base plate 2, which helps to improve reliability.

[0060] Like using Figure 6 As will be explained later, a die 51 is installed on each of the pair of legs 31, which is in contact with the front of the base plate 2 in the state shown in FIG. 4(b) and holds the outer periphery of the engaging portion 35 of the leg 31. By installing the die 51, a flange portion 37 can be provided on the front side of the base plate 2. This flange portion 37 has an outer diameter D1 that is larger than the inner diameter d2 of the leg fixing hole 4 and larger than the outer diameter d1 of the leg 31 due to the plastic flow generated by the cold riveting of the legs (see FIG. 4(c)).

[0061] Furthermore, by installing the die 51, as shown in FIG4(c), a smooth curve R with a certain radius of curvature is formed at the end of the flange 37 on the engaging side between the flange 37 and the engaging part 35. By providing the curve R, even if a load is generated by the latch L pulling the engaging part 35 of the striker 1, the load will be distributed and the load applied to the engaging part 35 can be reliably borne.

[0062] As described above, by making the leg fixing hole 4 a straight hole, there is no need to process the leg fixing hole 4 and the leg 31, thus reducing the number of manufacturing steps for the firing pin 1 and reducing costs.

[0063] Figures 5(a) to 5(c) The diagram shows the assembly process when the leg fixing hole 4 in the bolt 1 of this invention is a tapered hole. The leg fixing hole 4 is formed by a shearing process such as stamping, and consists of a sheared surface and a fracture surface that forms a surface rougher than the sheared surface. As shown in FIG. 5(a), the sheared surface of the leg fixing hole 4 can be set as a tapered sheared surface 45 that forms a tapered hole. Of the tapered sheared surface 45 and the fracture surface 46, the thickness l of the tapered sheared surface 45 is at least 1 / 2 or more of the plate thickness t of the base plate 2.

[0064] In this invention, the legs 31 of the rod 3 are all constructed with the same straight outer diameter d1 up to their front ends. Therefore, the inner diameter d2 of the leg fixing hole 4 provided on the base plate 2 through which the legs 31 pass is equal to or larger than the outer diameter d1 of the legs. Through shearing of the leg fixing hole 4, a tapered shape with a predetermined angle is formed on the fracture surface 46. By providing a tapered shape on the sheared surface of the leg fixing hole in the base plate, the legs 31 of the rod 3 are easily introduced into the leg fixing hole 4 when the rod 3 is positioned there, thus improving workability.

[0065] Figure 5(b) shows the state in which the front ends of a pair of legs 31 pass through a pair of leg fixing holes 4. Since the front ends of the legs 31 are straight, if cold riveting is performed in this state, it is easy to obtain a larger flattening (riveting) amount during riveting, and to form a larger riveting portion 33 on the back side of the base plate 2, thereby firmly holding the rod 3 to the base plate 2 and contributing to improved reliability. Furthermore, by plastically deforming the legs on the front side in a tapered manner along the tapered shear plane 45 during riveting, the rod 3 can be held more firmly to the base plate 2.

[0066] Like using Figure 7 As will be explained later, a die 51 is installed on each of the pair of legs 31, which is in contact with the front of the base plate 2 as shown in FIG. 5(b) and holds the outer periphery of the engaging portion 35 of the leg 31. By installing the die 51, a flange portion 37 can be provided on the front side of the base plate 2. The flange portion 37 has an outer diameter D1 that is larger than the inner diameter d2 of the leg fixing hole 4 and larger than the outer diameter d1 of the leg 31 due to the plastic flow generated by the cold riveting of the leg (see FIG. 5(c)).

[0067] Furthermore, by installing the die 51, as shown in FIG5(c), a smooth curve R with a certain radius of curvature is formed at the end of the flange 37 on the engaging side between the flange 37 and the engaging part 35. By providing the curve R, even if a load is generated by the latch L pulling the engaging part 35 of the striker 1, the load will be distributed and the load applied to the engaging part 35 can be reliably borne.

[0068] Figure 6 The diagram shows a die 51 that holds the leg 31 in the engagement portion 35 on the front side of the base plate during cold riveting when the shear surface of the leg fixing hole is a straight hole. A die 51 is installed on each pair of legs 31, contacting the front side of the base plate 2 in the state shown in FIG. 4(b) and holding the outer periphery of the leg 31. By installing the die 51, a flange portion 37 can be provided on the front side of the base plate 2, which has an outer diameter D1 larger than the inner diameter d2 of the leg fixing hole 4 and larger than the outer diameter d1 of the leg 31 due to the plastic flow generated by the cold riveting.

[0069] like Figure 6As shown, a space SP of die 51 is provided around the leg 31 on the front side of the base plate 2, and near the front side of the base plate 2. If cold riveting is performed with the die 51 installed as shown in FIG. 4(b), the front end of the leg 31 flows due to plastic deformation and flows into the space SP around the leg 31, resulting in the formation of a flange 37 with a large outer diameter D1. Furthermore, a die corner 51R is provided at a position from the front side of the base plate 2 along the leg 31 at a distance H, i.e., at the end of the space SP. The metal flowing through the leg 31 flows into the space SP near the die corner 51R, thereby forming a smooth curve R with a certain radius of curvature. By providing the curve R, even if a load is generated by pulling the engagement part 35 of the bolt 1 by the latch L, the load will be distributed and the load applied to the engagement part 35 can be reliably borne.

[0070] and Figure 6 same, Figure 7 This illustrates the die held in place on the front side of the base plate during cold riveting when the shear surface of the leg fixing hole is a tapered hole. (Example) Figure 7 As shown, a space SP is provided around the leg 31 on the front side of the base plate 2 of the die 51, and near the front side of the base plate 2. If cold riveting is performed with the die 51 installed as shown in FIG. 5(b), the front end of the leg 31 flows due to plastic deformation and flows into the space SP around the leg 31, resulting in the formation of a flange 37 with a large outer diameter D1. When the leg fixing hole 4 is a tapered shear surface 45, the plastic flow of the metal of the leg 31 has the following characteristics in terms of its tightness with the tapered shear surface 45 and the fracture surface 46, and its flow into the space SP.

[0071] When the front end of the leg 31 is plastically deformed by cold riveting, the fracture surface 46, which is softer than the conical shear surface 45, is pressed by the riveting part 33 and expanded in diameter, further forming a conical shape, thereby making the riveting part 33 and the fracture surface 46 fit together tightly. This situation is similar to... Figure 6 The fracture surface 44 is the same. On the other hand, in the conical shear surface 45, through the plastic deformation of the leg 31, the leg 31 expands in diameter along the conical shear surface 45 toward the front side of the base plate and fits tightly with the conical portion of the conical shear surface 45. Therefore, as Figure 7 As shown, the leg 31 is firmly and tightly fitted with the conical shear surface 45 and the fracture surface 46. Further details... Figure 6 and Figure 7 The flange portions are compared. Figure 6 and Figure 7 The dotted lines on the flange portion 37 are drawn in a manner that allows for comparison of the size of the flange portion. Figure 7 The flange shown occupies the area covering the conical shear surface 45, therefore it is related to... Figure 6The flange portion is relatively larger. Therefore, Figure 7 The conical shear surface shown is Figure 6 The straight shear surface 43 shown can firmly hold the rod 3 to the base plate 2.

[0072] The material for rod 3 can be boron steel instead of high-strength steels such as chromium-molybdenum steel (SCM material). Generally speaking, boron steel is a type of steel made by adding more than 0.008 wt% boron (P) and a maximum of 0.3 wt% chromium to carbon steel. It has excellent hardenability and can achieve higher strength than ordinary iron steel. The lower the carbon content of the added boron, the better the hardenability. By making it a carbon steel with a lower carbon content, the machinability also improves. Therefore, the annealing process can be omitted when machining rod 3.

[0073] By using boron steel for rod 3, the carbon content is kept low, resulting in excellent cold workability and enabling reductions in power consumption and costs during processing. Furthermore, the low addition of chromium and molybdenum contributes to increased recycling of iron scrap, reducing the generation of chromium and molybdenum-containing slag during the melting and refining of iron scrap. This contributes to addressing SDG 12 (Sustainable Consumption and Production).

[0074] Therefore, it can be considered a response that helps to achieve the goals of the SDGs, namely, reducing electricity consumption for goal 7 (energy), addressing goal 12 (sustainable consumption and production), and further regarding goal 13 (climate change), it can also be expected that the reduction in CO2 emissions will be achieved with the reduction in electricity consumption.

[0075] In addition to the aforementioned side door bolts, the bolts for door latches of this invention can also be applied to rear doors, engine hoods, trunk lids, etc.

[0076] The above describes one embodiment of the present invention, but various modifications, alterations and combinations can be made to the above embodiment without departing from the spirit of the present invention.

[0077] For example, the base plate can be shaped to appear roughly elliptical when viewed from above, but the shape of the base plate is not particularly limited. For example, it can also appear roughly circular or roughly quadrilateral when viewed from above.

[0078] For example, in addition to ordinary steel, the base plate can also be made of high-strength steel, depending on the vehicle's strength requirements. By using high-strength steel, the shear surface of the leg mounting holes is less prone to deformation during cold riveting of the legs compared to using ordinary steel. Therefore, the diameter of the leg mounting holes is less likely to increase, which is advantageous in terms of strength.

Claims

1. A bolt for a door latch, characterized in that, The bolt for the door latch includes: a base plate fixed to the bolt mounting surface; and a rod shaped like the Japanese katakana character コ, having a pair of legs capable of engaging with the door latch and a bottom located between the pair of legs. The base plate has leg fixing holes for the legs of the rod to pass through and be fixed. The inner diameter of the leg fixing hole is equal to or larger than the outer diameter of the leg. By cold riveting the portion of the rod's leg that extends through the front side of the leg fixing hole and protrudes from the back side of the leg fixing hole, a riveting portion larger than the inner diameter of the leg fixing hole is formed on the back side of the base plate. On the front side of the base plate, a flange portion larger than both the inner and outer diameter of the leg is formed on a portion of the leg. The riveting portion and the flange portion clamp the base plate. The leg has the flange portion and the engaging portion capable of engaging with the latch. The engaging portion is located closer to the bottom side than the flange portion.

2. The bolt for a door latch according to claim 1, characterized in that, The leg fixing holes of the base plate are formed by straight holes, and the front end to the end of the leg of the rod are formed with the same diameter.

3. The bolt for a door latch according to claim 1, characterized in that, The front side of the leg fixing hole of the base plate is formed by a tapered hole, and the front end of the leg of the rod is formed with the same diameter up to the end.

4. The bolt for a door latch according to claim 2 or 3, characterized in that, A curved portion is formed between the engaging portion and the flange portion of the leg.

5. The bolt for a door latch according to claim 1, characterized in that, The leg fixing holes have shear surfaces and fracture surfaces formed by shearing the base plate. The thickness of the sheared surface in the thickness direction of the base plate is at least 1 / 2 of the thickness of the base plate.

6. The bolt for a door latch according to claim 1, characterized in that, When the riveted portion and the flange portion are formed on the leg by cold riveting, the die supporting the front side of the base plate holds the engaging portion, and a space is provided on the front side of the base plate of the die and near the leg portion.

Images