Door latch striker

Abstract

In order to contribute to achieving the targets of the SDGs, from the viewpoint of reducing power consumption and reducing CO2 emissions, a door latch striker, in which flange parts are not required to be provided on both leg parts of an engaging rod, is provided.　The door latch striker is characterized in that: the striker is provided with a base plate fixed to a striker mounting surface, and a U-shaped engaging rod having a pair of leg parts engageable with a door latch; the base plate has a leg part fixing hole for inserting and fixing the leg part of the engaging rod; the end part of the leg part is provided with a tapered part that narrows toward the tip; and the inner diameter of the leg part fixing hole is made smaller than the outer diameter of the leg part, and a portion, protruding from the rear surface side of the leg part fixing hole, of the tapered part inserted from the front surface side of the leg part fixing hole is cold-crimped to form a crimped part.

Description

Door latch striker

[0001] The present invention relates to a door latch striker that engages with a door latch provided on an automobile door to hold the door in a closed position, and in particular, to a door latch striker that reduces power consumption during the manufacturing stage, thereby reducing CO ２ This invention relates to a striker for a door latch that is expected to reduce emissions and utilizes superior materials for improved strength and recycling.

[0002] Conventionally, as in Patent Document 1, a striker for an automotive opening / closing body is known in which a rod made of high-strength steel (chromium molybdenum steel) is bent into a U-shape to form flanges near both ends in a hole in a base plate made of ordinary steel, and both ends of an engaging rod that has been heat-treated to remove internal stress generated by processing and to increase strength are inserted through the hole and then fixed by cold caulking, thereby reducing heat treatment costs. However, in order to fix the engaging rod to the surface side of the base plate, it is necessary to perform a process such as forging to provide the flanges, which reduces power consumption and CO ２ However, there were still issues to be addressed in terms of reducing emissions.

[0003] Furthermore, as in Patent Document 2, a striker is known in which a taper is provided at the top of a leg fixing hole provided in a base plate, both legs of an engaging rod are inserted into the leg fixing holes, and the leg portion forming the upper enlarged diameter crimped portion is cold-crimped to accommodate the upper enlarged diameter crimped portion in the upper tapered hole portion, thereby achieving miniaturization. However, as in Patent Document 1, a process is required to provide a flange by header processing or the like at the portion that is to be in close contact with the surface side of the base plate, which leads to reduction in power consumption and CO ２ In addition to reducing the amount of waste, there were also issues with costs.

[0004] On the other hand, base plates are made of standard steel, and vehicle mass is increasing with the shift to electric vehicles (EVs). This increases the load on doors, necessitating increased door lock system strength. This requires increasing the thickness of base plates and other strength measures, which could lead to increased weight due to larger strikers. While high-strength chromium-molybdenum steel has traditionally been used for locking rods, there is a need to utilize better materials in the future to improve processing and recycling, thereby achieving the SDGs. Avoiding larger strikers and utilizing superior materials for locking rod processing will reduce power consumption. Furthermore, utilizing superior materials to improve locking rod recycling will address the issue of steel recycling, which is considered an effective approach toward achieving the SDGs.

[0005] The importance of promoting activities such as reducing power consumption and improving recycling is recognized from the perspective of environmental considerations and the Sustainable Development Goals (SDGs). The Sustainable Development Goals are international goals set out in the 2030 Agenda for Sustainable Development adopted at the United Nations Summit, aiming to create a sustainable and better world by 2030. The SDGs consist of 17 goals, and reducing power consumption is an initiative that will lead to the achievement of Goal 7 (Energy), "Affordable and clean energy." Furthermore, improving recycling is an initiative that will lead to the achievement of Goal 12 (Sustainable consumption and production), "Ensure sustainable consumption and production patterns." Furthermore, for Goal 13 (Climate Change), "Take urgent action to combat climate change," reducing CO2 emissions from power consumption is also an initiative that will lead to the achievement of Goal 13 (Climate Change), "Take urgent action to combat climate change." ２ This initiative is expected to have a reduction effect on emissions, and is therefore considered to be one that will lead to achieving the goal.

[0006] Patent No. 2935812 Patent No. 6349573

[0007] The strikers described in Patent Documents 1 and 2 require processing to provide flanges on both legs of the engaging rod before inserting and fixing it to the base plate, which reduces power consumption and CO ２ In view of the above-mentioned problems, an object of the present invention is to provide a striker that does not require flanges to be provided on both legs of an engagement rod.

[0008] In addition, the striker base plate described in Patent Document 1 is made of general steel and is not heat-treated. However, to avoid increasing the striker size, it is desirable to heat-treat the general steel to increase the product strength of the base plate. Furthermore, the striker engagement rod is generally made of high-strength steel (chromium-molybdenum steel). Because chromium-molybdenum steel contains significant amounts of chromium and molybdenum added to the iron base material, when recycling the iron, the main component, these chromium and molybdenum must be captured in slag as impurities and removed. To improve iron recycling, it is desirable to keep the added amounts low. In view of the above-mentioned problems, the present invention aims to provide a general steel base plate that can be heat-treated and a high-strength steel with minimal added amounts of alloying elements for the engagement rod.

[0009] According to the present invention, the above problems are solved as follows: A first invention is a door latch striker comprising: a base plate fixed to a striker mounting surface; and a U-shaped engagement rod having a pair of legs that can engage with a door latch, the base plate has leg fixing holes through which the legs of the engagement rod are inserted to fix the base plate, the ends of the legs are provided with tapered portions that narrow towards the tips, the inner diameter of the leg fixing holes is smaller than the outer diameter of the legs, and the portions of the tapered portions that are inserted from the front side of the leg fixing holes and protrude from the back side of the leg fixing holes have crimped portions formed by cold crimping.

[0010] By providing a tapered portion at the end of the leg, the engaging rod can be fixed in the axial direction after crimping without having to provide a flange on the surface side of the base plate of the engaging rod in advance, which reduces power consumption and CO ２ This reduces the amount of waste and also reduces costs.

[0011] The second invention is characterized in that the leg fixing hole has a shear surface and a fracture surface formed by shearing the base plate, and the length of the shear surface in the thickness direction of the base plate is at least 1 / 2 of the thickness of the base plate.

[0012] By caulking, the tapered portion of the leg of the engaging rod and the shear surface of the leg fixing hole are tightly attached, and the tip of the engaging rod and the base plate are tightly attached, resulting in a unified structure without any rattle. The longer the length of the shear surface in the thickness direction of the base plate, the higher the degree of adhesion, but lengthening the shear surface requires expensive processing such as fine blanking, which does not lead to cost reduction. Adjusting the length of the shear surface to achieve the appropriate degree of adhesion leads to cost reduction.

[0013] A third invention is characterized in that the leg fixing holes are formed as straight holes.

[0014] By caulking, the tapered part of the leg of the engaging rod and the straight part (shear surface) of the leg fixing hole are tightly fitted together, and the tip of the tapered part is also tightly fitted to the base plate, resulting in a single piece without any rattle. By using a straight hole, processing costs can be reduced.

[0015] A fourth aspect of the present invention is characterized in that the end of the leg has a taper angle of 20 degrees or less.

[0016] The smaller the taper angle, the smaller the processing pressure that can be applied during swaging, and the less likely work hardening occurs, improving the elongation rate of the tapered portion. In addition, the thickness of the engaging rod due to swaging can be reduced, making additional processing unnecessary. By reducing the taper angle, CO2 emissions can be reduced by reducing power consumption. ２ This will lead to a reduction in

[0017] The fifth invention is characterized in that at the joint between the leg fixing hole and the tapered portion after cold crimping, the cross-sectional shape of the joint is formed in a U-shape starting from the back side of the leg fixing hole.

[0018] The tapered portions of the legs of the engaging rod are fixed to the shear and fracture surfaces of the base plate by cold caulking, so that the joint is tightly adhered in a dogleg shape, resulting in excellent strength.

[0019] A sixth invention, which is another embodiment of the first invention, is a striker for a door latch, comprising: a base plate fixed to a striker mounting surface; and a U-shaped engaging rod having a pair of legs that can engage with a door latch; the base plate has leg fixing holes through which the legs of the engaging rod are inserted to fix the rod, and tapered portions are provided at the ends of the legs so that they become thinner at the tips; the inner diameter of the leg fixing holes is equal to or larger than the outer diameter of the legs; the leg fixing holes are formed as tapered holes; and the tapered portions that are inserted from the front side of the leg fixing holes and that protrude from the back side of the leg fixing holes form crimped portions by cold crimping.

[0020] By providing a tapered section at the end of the leg so that the tip becomes narrower, and by making the inner diameter of the leg fixing hole equal to or larger than the outer diameter of the leg, and by forming the leg fixing hole as a tapered hole, the tapered section of the leg of the engaging rod and the tapered section (shear surface) of the leg fixing hole are closely fitted together by crimping, without the need to previously provide a flange on the surface side of the base plate of the engaging rod, and the tip side of the tapered section is closely fitted to the base plate, so they are integrated without any rattle, which reduces power consumption and CO ２ This reduces the amount of waste and also reduces costs.

[0021] A seventh invention, which is yet another embodiment of the first invention from the viewpoint of materials, is a door latch striker comprising a base plate fixed to a striker mounting surface, and a U-shaped engagement rod fixed to the base plate and having a pair of legs that can engage with a door latch, wherein the base plate is made of general steel, the engagement rod is made of boron steel, and the pair of legs of the engagement rod are inserted from the surface side of the base plate into leg fixing holes provided in the base plate and fixed by cold crimping.

[0022] Boron steel is used for the engaging rod. Boron steel has a low carbon content and improves cold workability, so it can be processed as is. This reduces power consumption and costs in processing. Furthermore, because boron steel contains low amounts of chromium and molybdenum, it is easily absorbed into slag and removed during melting and refining in iron recycling. Furthermore, because only a small amount of slag is generated, it is highly recyclable as scrap iron.

[0023] The eighth invention is a method for manufacturing a door latch striker comprising: a base plate formed from general steel and fixed to a striker mounting surface; and a U-shaped engagement rod formed from boron steel and fixed to the base plate, the engagement rod having a pair of legs that can engage with a door latch, wherein an end of the engagement rod is inserted from the front surface side of the base plate into a leg fixing hole provided in the base plate and fixed by cold crimping, and then the engagement rod is heat-treated together with the base plate.

[0024] Since the base plate is heat treated together with the engaging rod, the product strength of the base plate can be increased and the base plate can be made thinner.

[0025] A ninth invention is characterized in that the general steel material of the base plate is SC material (carbon steel material for mechanical structures) or H steel (alloy steel material for mechanical structures with guaranteed hardenability).

[0026] The general steel material in Patent Document 1 is not heat-treated, so SS material (general structural rolled steel material), SPC material (cold-rolled steel plate), SPH material (hot-rolled steel plate), etc., which do not have heat treatment regulations, are usually used. On the other hand, the general steel material in the present invention is heat-treated, so steel material for which heat treatment regulations are specified is used. By using general steel material that can be heat-treated, it is possible to reduce the thickness of the base plate.

[0027] A tenth aspect of the present invention is characterized in that the heat treatment of the base plate and the engaging rod is quenching and tempering.

[0028] By subjecting a base plate made of general steel to quenching and tempering as heat treatment, the mechanical properties of the base plate, such as tensile strength and toughness, are improved, making it possible to increase the strength of the product and reduce the thickness of the base plate.

[0029] According to the striker for a door latch of the present invention, the engaging rod can be fixed in the axial direction after crimping without the need to previously provide a flange on the surface side of the base plate of the engaging rod, which reduces power consumption and CO ２This reduces CO2 emissions and lowers costs. This can be considered an initiative that contributes to achieving Goal 13 (Climate Change), one of the SDGs, because it is expected to reduce CO2 emissions through reduced power consumption. Furthermore, by using boron steel for the engaging rod, the carbon content is kept low, resulting in excellent cold workability and reduced power consumption and costs in processing. Furthermore, the low amount of chromium and molybdenum added leads to improved recycling of scrap iron and reduces the generation of slag containing chromium and molybdenum during the melting and refining of scrap iron. This contributes to achieving Goal 12 (Sustainable Consumption and Production). In addition, by using heat-treatable steel for the base plate and performing quenching and tempering heat treatments, the thickness of the base plate can be avoided, leading to reduced power consumption in processing and contributing to the achievement of Goal 7 (Energy). Furthermore, with regard to Goal 13 (Climate Change), the reduction in CO2 emissions through reduced power consumption can be achieved. ２ Since it is expected to have an effect of reducing emissions, it can be considered an initiative that will lead to achieving the goal.

[0030] 11 is a perspective view of an embodiment of a door latch striker according to the present invention; FIG. 12 is a front view of the door latch striker of FIG. 1; FIG. 13 is a side view of the door latch striker of FIG. 1; FIG. 14 is a plan view of the door latch striker of FIG. 1; FIG. 15 is a longitudinal sectional view of an engagement rod and a base plate before crimping; FIG. 5 is an enlarged view of a portion surrounded by a dashed line in FIG. 5; FIG. 16 is a longitudinal sectional view of an engagement rod and a base plate after crimping; FIG. 7 is an enlarged view of a portion surrounded by a dashed line in FIG. 7; FIG. 17 is a longitudinal sectional view of an engagement rod and a base plate having leg fixing holes formed as tapered holes before crimping, as another embodiment; FIG. 18 is an enlarged view of a portion surrounded by a dashed line in FIG. 19; FIG. 19 is a longitudinal sectional view of an engagement rod and a base plate having leg fixing holes formed as tapered holes after crimping, as another embodiment; FIG. 19 is an enlarged view of a portion surrounded by a dashed line in FIG. 11;

[0031] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiment described below, and includes appropriate modifications of the embodiment described below within the scope obvious to those skilled in the art.

[0032] In the description of this specification, the surface of the base plate 2 opposite to the side facing the striker mounting surface D is referred to as the front surface, and the surface facing the striker mounting surface D is referred to as the back surface.

[0033] 1 to 4, the striker 1 for a door latch according to this embodiment is attached to a striker attachment surface D of the body of an automobile and has the function of holding the door in a closed position by engaging with a door latch L attached to the automobile door. The striker 1 has a base plate 2 fixed to the striker attachment surface D of the body, and a U-shaped engagement rod 3 having a pair of legs 31, 31 that can engage with the door latch.

[0034] The base plate 2 is fixed to the striker mounting surface D by inserting flat head screws or the like (not shown) into a pair of striker mounting holes 5, 5. The engaging rod 3 is fixed to the base plate 2 by inserting the ends of a pair of legs 31, 31 of the engaging rod 3 into a pair of leg fixing holes 4, 4 provided in the base plate 2 and forming a pair of enlarged diameter crimped portions 33, 33 (see FIGS. 2 and 8 ) by cold crimping. According to the door latch striker of the present invention, the engaging rod 3 can be fixed in the axial direction after crimping without the need to previously provide a flange on the surface side of the base plate 2 of the engaging rod 3, which reduces power consumption and therefore CO2 emissions and costs.

[0035] The base plate 2 is formed of a general steel material such as a hot-rolled steel plate of a predetermined thickness and has a generally elliptical shape in a plan view. An upward bent portion 21 is formed in the center of the minor axis side to which the legs 31 of the engaging rod 3 are fixed. A continuously opening deformation allowance space S is formed between this upward bent portion 21 and the striker mounting surface D on a line connecting the ends of the pair of legs 31, 31 inserted into the pair of leg fixing holes 4, 4 (see FIG. 7 ). With such deformation allowance space S formed, when a tensile load acts on the engaging rod 3, the base plate 2 compresses the deformation allowance space S and deforms downward. As a result, the tensile load acting on the engaging rod 3 is alleviated, making the engaging rod 3 less likely to break.

[0036] The engaging rod 3 is made of a high-strength steel material such as chromium-molybdenum steel (SCM material). Alternatively, the engaging rod 3 may be formed by bending a rod-shaped rod made of low-alloy TRIP steel having transformation-induced plasticity (TRIP) of retained austenite, such as SUS304, which is a metastable austenitic stainless steel, into a U-shape by press working or the like.

[0037] As shown in Figures 5 and 6, the leg fixing holes 4 in the base plate 2 are formed by shearing, such as by press working. Preferably, the leg fixing holes 4 are formed such that the length of the sheared surface 41, of the sheared surfaces 41 and fractured surfaces 42 that are generated during shearing, is at least half the thickness of the base plate 2. The sheared surface 41 is work-hardened by plastic working. A longer sheared surface 41 increases the degree of adhesion between the tapered portion 32 and the sheared surface 41, but lengthening the sheared surface requires expensive processing such as fine blanking, which does not result in cost reduction. Adjusting the length of the sheared surface 41 to achieve an appropriate degree of adhesion can lead to cost reduction.

[0038] Furthermore, the region of the leg fixing hole 4 where the sheared surface 41 is formed is a straight hole, and the inner diameter d2 of this straight hole is formed to be smaller than the outer diameter d1 of the leg 31 of the engaging rod 3. Furthermore, during shearing, a sagging surface 43 is formed at the end of the region of the leg fixing hole 4 where the sheared surface 41 is formed (the surface side of the leg fixing hole 4), and a taper of a predetermined angle is formed in the region of the leg fixing hole 4 where the fractured surface 42 is formed.

[0039] A tapered portion 32 having a predetermined angle is formed at the end of the leg portion 31 of the engaging rod 3. Preferably, the taper angle α (see FIG. 6) is set to 20 degrees or less. The smaller the taper angle α, the less processing pressure can be applied during swaging and the less work hardening occurs, which improves the elongation rate of the tapered portion and reduces the thickness of the leg portion 31 due to swaging, making additional processing unnecessary.

[0040] To fix the ends of the legs 31 of the engaging rod 3 to the leg fixing holes 4 of the base plate 2, the tapered portions 32 of both legs 31 are inserted into the leg fixing holes 4 of the base plate 2 from the front side, and the tapered portions 32 protruding from the back side of the leg fixing holes 4 are cold swaged to form enlarged diameter crimped portions 33 as shown in Figures 7 and 8. By plastically deforming the tapered portions 32 protruding from the leg fixing holes 4 by cold swaging, enlarged diameter crimped portions 33 are formed as enlarged diameter flanges with a diameter larger than the outer diameter of the leg fixing holes 4 at the lower parts of the legs 31 that sandwich the base plate 2.

[0041] When the tapered portion 32 of the leg 31 is plastically deformed by cold crimping, the fracture surface 42, which is softer than the shear surface 41, is pressed by the diameter-expansion crimping portion 33 to expand and form a tapered shape, thereby bringing the diameter-expansion crimping portion 33 and the fracture surface 42 into close contact. Furthermore, as the diameter of the tapered portion 32 expands due to plastic deformation, the tapered portion 32 also comes into close contact with the sagging surface 43 formed at the end of the shear surface 41. Therefore, as shown in FIG. 8 , the tapered portion 32 tightly adheres to the shear surface 41 and the fracture surface 42 of the leg fixing hole 4, and in the vertical cross section of the joint between the leg fixing hole 4 and the tapered portion 32, the shape of this joint is formed in a dogleg shape, starting from the back side (the fracture surface 42 side) of the leg fixing hole 4.

[0042] 9 and 10, the region of the leg fixing hole 4 where the shear surface 41 is formed can be made into a tapered hole. The inner diameter d2 of this tapered hole can be made equal to or larger than the outer diameter d1 of the leg 31 of the engaging rod 3. Furthermore, during shearing, a taper of a predetermined angle is formed in the region of the leg fixing hole 4 where the fracture surface 42 is formed.

[0043] When the tapered portion 32 of the leg portion 31 is plastically deformed by cold crimping, the fracture surface 42, which is softer than the shear surface 41, is pressed by the diameter expansion crimping portion 33 to be expanded in diameter and formed into a tapered shape, so that the diameter expansion crimping portion 33 and the fracture surface 42 come into close contact with each other (see FIGS. 11 and 12 ). Furthermore, as the diameter of the tapered portion 32 expands due to plastic deformation, the diameter of the leg portion 31 expands as if escaping toward the gap that is generated between the leg portion 31 and the tapered hole and widens toward the surface side, so that the hole of the base plate, which is made of soft general steel, comes into close contact with the tapered portion 32 of the leg portion 31 of the engaging rod 3 while deforming. 12, the tapered portion 32 is firmly attached to the shear surface 41 and fracture surface 42 of the leg fixing hole 4, and in the vertical cross section of the joint between the leg fixing hole 4 and the tapered portion 32, the shape of this joint is formed in a dogleg shape starting from the back side (the fracture surface 42 side) of the leg fixing hole 4. Therefore, in a door latch striker that uses general steel for the base plate, it is possible to achieve both cost reduction and strength.

[0044] In yet another embodiment, in order to thin the base plate 2, the ends of a pair of legs 31, 31 of the engaging rod 3 are inserted into a pair of leg fixing holes 4, 4 provided in the base plate 2, and a pair of enlarged diameter crimped portions 33, 33 are formed by cold crimping to fix the engaging rod 3 to the base plate 2, and then the base plate 2 can be heat-treated together with the engaging rod 3. Since the general steel material in Patent Document 1 is not heat-treated, steel materials for which no heat treatment regulations are specified, such as SS material (general structural rolled steel), SPC material (cold-rolled steel plate), and SPH material (hot-rolled steel plate), are typically used. On the other hand, since the general steel material according to the present invention is heat-treated, steel materials for which heat treatment regulations are specified, such as S-C material (carbon steel material for mechanical structures) and H steel (alloy steel for mechanical structures with guaranteed hardenability), are used.

[0045] This heat treatment is quenching and tempering to increase the strength of the product while thinning the base plate 2. Quenching and tempering improve the mechanical properties of the base plate, such as tensile strength and toughness, and allow for a thinner wall. The quenching conditions are 820 to 870°C, which is the quenching temperature at which a martensite single phase is obtained as the quenched structure of ordinary S-C material (carbon steel for machine structures), and the tempering conditions are 500 to 650°C, which is the tempering temperature at which a large amount of fine cementite Fe3C precipitates, imparting good toughness.

[0046] By using a steel material that can be heat-treated as the material for the base plate 2 and performing heat treatments such as quenching and tempering, it is possible to avoid making the base plate 2 thicker, which leads to a reduction in power consumption in processing and contributes to achieving Goal 7 (Energy).

[0047] Boron steel can be used for the engaging rod 3 instead of high-strength steel such as chromium-molybdenum steel (SCM material). Generally, boron steel is a type of steel made by adding 0.008 wt% or more of boron (boron) and up to 0.3 wt% of chromium to carbon steel. It has excellent hardenability and is characterized by higher strength than ordinary steel. The lower the carbon content of carbon steel, the better the hardenability, and using carbon steel with a low carbon content also improves workability. Therefore, the engaging rod 3 can be processed without the annealing process.

[0048] The use of boron steel for the engaging rod material allows for a low carbon content, making it suitable for cold workability and reducing power consumption and costs in processing. Furthermore, the low amount of chromium and molybdenum added leads to improved recycling of scrap iron, and reduces the generation of slag containing chromium and molybdenum during the melting and refining of scrap iron, which contributes to the achievement of Goal 12 of the SDGs (Sustainable Consumption and Production).

[0049] Therefore, this will lead to efforts to reduce power consumption, which is Goal 7 (Energy), and Goal 12 (Sustainable consumption and production), which are the goals of the SDGs. Furthermore, for Goal 13 (Climate Change), the reduction of CO2 emissions associated with power consumption reduction will contribute to the achievement of this goal. ２ Since it is expected to have an effect of reducing emissions, it can be considered an initiative that will lead to achieving the goal.

[0050] The door latch striker according to the present invention can be applied to strikers for back doors, hoods, trunk lids, etc. in addition to the side doors described above.

[0051] Although one embodiment of the present invention has been described above, the following various modifications, changes, and combinations can be made to the above embodiment without departing from the spirit of the present invention.

[0052] In the above embodiment, the end of the leg is provided with a single-stage tapered portion that narrows toward the tip, but a multi-stage tapered portion with two or more different taper angles α may be provided. As shown in Figure 13, when the taper angle of the tapered portion 32 of the leg 31 of the engaging rod 3 is defined as a first taper angle α1 and the other as a second taper angle α2, α1 < α2 is satisfied, and the second taper angle α2 of the second taper portion 32-2 is set to be larger than the first taper angle α1 of the first taper portion 32-1 to facilitate close contact with the leg fixing hole 4, and the first taper angle α1 of the first taper portion 32-1 is set to be smaller than the second taper angle α2 of the second taper portion 32-2 to ensure a wide end of the tapered portion that is pressed by cold swaging.

[0053] In the above embodiment, the base plate has a generally elliptical shape in plan view, but the shape of the base plate is not particularly limited. For example, it may have a generally circular or rectangular shape in plan view.

[0054] In the above embodiment, the base plate may be made of high-strength steel. By using high-strength steel, the shear surface of the leg fixing hole is less likely to deform when the tapered portion of the leg is cold-swaged than when using ordinary steel, so the diameter of the leg fixing hole is less likely to expand, which is advantageous in terms of strength.

[0055] REFERENCE SIGNS LIST 1 striker 2 base plate 3 engaging rod 4 leg fixing hole 5 striker mounting hole 21 upward bent portion 31 leg 32 tapered portion 32-1 first tapered portion 32-2 second tapered portion 33 enlarged caulking portion 41 shear surface 42 fracture surface 43 sagging surface D striker mounting surface d1 outer diameter of leg d2 inner diameter of leg fixing hole L door latch S allowable deformation space α taper angle α1 first taper angle α2 second taper angle

Claims

1. The striker is attached to the striker mounting surface of the door. The striker is attached to the striker mounting surface of the door. The striker is attached to the striker mounting surface of the door. The striker is attached to the striker mounting surface of the striker ... the base plate has leg fixing holes through which the leg portions of the engagement rods are inserted and fixed, the leg fixing holes being formed as straight holes, and tapered portions being provided at the ends of the leg portions so that the tips become narrower; The inner diameter of the leg fixing hole is smaller than the outer diameter of the leg, A striker for a door latch, characterized in that a crimped portion is formed by cold crimping the portion of the tapered portion inserted from the front side of the leg fixing hole and protruding from the back side of the leg fixing hole.

2. 2. The door latch striker according to claim 1, wherein the leg fixing hole has a shear surface and a fracture surface formed by shearing the base plate, and the length of the shear surface in the thickness direction of the base plate is at least half the thickness of the base plate.

3. (delete)

4. 2. The door latch striker according to claim 1, wherein the taper angle of the tapered portion of the leg portion is set to 20 degrees or less.

5. 3. The door latch striker according to claim 1, wherein the shape of the joint portion is formed in a V-shape in a vertical cross section of the joint portion between the leg fixing hole and the tapered portion after cold crimping, starting from the rear side of the leg fixing hole.

6. The striker is attached to the striker mounting surface of the door. The striker is attached to the striker mounting surface of the door. The striker is attached to the striker mounting surface of the door. The striker is attached to the striker mounting surface of the striker ... the base plate has a leg fixing hole through which the leg of the engagement rod is inserted and fixed, and a tapered portion is provided at an end of the leg so that the tip becomes narrower; The inner diameter of the leg fixing hole is equal to or larger than the outer diameter of the leg; The leg fixing holes are formed as tapered holes having a single taper angle; A striker for a door latch, characterized in that a crimped portion is formed by cold crimping the portion of the tapered portion inserted from the front side of the leg fixing hole and protruding from the back side of the leg fixing hole.

7. A striker for a door latch includes: a base plate fixed to a striker mounting surface; and a U-shaped engagement rod fixed to the base plate and having a pair of legs that can engage with a door latch, wherein the ends of the legs are provided with tapered portions that narrow towards the tips, A striker for a door latch, characterized in that the base plate is formed from general steel, the engaging rod is formed from boron steel, and the pair of legs of the engaging rod are inserted from the surface side of the base plate into leg fixing holes provided in the base plate and fixed by cold crimping.

8. A striker for a door latch comprising: a base plate made of general steel and fixed to a striker mounting surface; and a U-shaped engagement rod made of boron steel, fixed to the base plate, and having a pair of legs that can engage with a door latch, wherein the general steel of the base plate is S-C steel (carbon steel for mechanical structures) or H steel (alloy steel for mechanical structures with guaranteed hardenability), and the ends of the legs are provided with tapered portions that narrow to the tips, A method for manufacturing a striker for a door latch, characterized in that an end of the engagement rod is inserted from the surface side of the base plate into a leg fixing hole provided in the base plate and fixed by cold crimping, and then heat treated together with the base plate.

9. (delete)

10. 9. The method for manufacturing a striker for a door latch according to claim 8, wherein the heat treatment of the base plate and the engaging rod is quenching and tempering.