A split type latch housing and a manufacturing method thereof

Abstract

The present invention discloses a split type bolt housing, comprising a split bottom plate and an outer cover, and also comprising an inner liner, wherein the inner liner comprises two mounting parts arranged opposite to each other and a connecting part connected between the two mounting parts so as to connect them into one body, the outer cover is hollowly arranged inside to form a receiving cavity for the connecting part to enter, the bottom plate is located at the bottom of the mounting part and the connecting part, the outer cover is provided with a hook for hooking at the bottom of the bottom plate so as to make the bottom plate, the inner liner and the outer cover tightly fit, the inner liner is integrally formed with the mounting part, a bottom plate is assembled at the bottom of the inner liner, and then the outer cover cooperates with the bottom plate through a reverse hook and an easy-folding piece so as to lock the outer cover, the inner liner and the bottom plate into a whole, so that the outer cover is more stable when in use.

Description

Technical Field

[0001] The present invention relates to the technical field of bolts, and in particular to a split bolt housing and a manufacturing method thereof. Background Art

[0002] In the prior art, there is a Chinese utility model patent with the patent number: 202022524671.1 and the patent name: A split bolt, comprising a lock tongue, a shell, a pull ring for driving the lock tongue to slide and a reset spring for resetting the lock tongue, the lock tongue is slidably arranged in the shell, a shaft body is penetrated through the shell, the pull ring passes through the lock tongue and the shell in sequence, one end of the pull ring is hingedly arranged on the shaft body, and the other end extends out of the shell, and the shell is also provided with a long slot a for the pull ring to swing, the shell comprises a bottom plate, a cover body and a baffle, the lock tongue is provided with a boss, the reset spring is sleeved on the lock tongue, and one end of the reset spring abuts on the boss, and the other end abuts on the baffle, the bottom plate, the cover body and the baffle are separately arranged, and the cover body A built-in installation groove, the notch of the installation groove is opened on the lower surface of the cover body, the bottom plate cover is arranged on the notch of the installation groove, the lower surface of the cover body is provided with a pin a, the bottom plate is provided with a slot a matched with the pin a, the pin a is inserted in the slot a, so as to realize the connection between the cover body and the bottom plate, the baffle is provided with a pin b, the bottom plate is provided with a slot b matched with the pin b, the pin b is inserted in the slot b, so as to realize the connection between the baffle and the bottom plate, when assembling, the baffle is fixed and assembled as a whole through the fixing part passing through the bottom plate, the baffle, the cover body and the bottom plate are matched with the pins and the slots, and the pins are bent to position the three, but the precision requirement is relatively high when the pins are bent, and it is easy to produce seams, which leads to the instability of the overall assembly. Summary of the invention

[0003] Purpose of the invention: In order to overcome the defects of the prior art, the present invention provides a split type latch housing, an inner lining is integrally formed with a mounting portion, a bottom plate is assembled at the bottom of the inner lining, and then the outer cover cooperates with the bottom plate through a hook to lock the outer cover, the inner lining and the bottom plate into a whole, making it more stable when in use.

[0004] The present invention discloses a split type bolt housing, comprising a split bottom plate and an outer cover, characterized in that: it also comprises an inner liner, the inner liner comprises two mounting parts arranged opposite to each other and a connecting part connected between the two mounting parts so as to connect them into one, the outer cover is hollow inside to form a receiving cavity for the connecting part to enter, the bottom plate is located below the mounting part and the connecting part and abuts against the bottom of the mounting part, and the outer cover is provided with a hook for hooking on the bottom of the bottom plate to achieve a tight fit between the bottom plate, the inner liner and the outer cover.

[0005] By adopting the above technical scheme, the outer cover, the bottom plate and the lining are processed separately to reduce the difficulty of the processing technology, thereby reducing the manufacturing cost. During assembly, the bottom plate is assembled to the lining to form a whole, and then the whole is assembled to the outer cover, making it more convenient to assemble. In addition, the hook on the outer cover will be hooked at the bottom of the bottom plate. At this time, the bottom plate acts as a gasket, so that the lining can be pressed on the outer cover to lock it, thereby preventing the outer cover from shaking relative to the lining. Because the connecting part and the mounting part on the lining are integrated, the connecting part will not shake relative to the mounting part, so that the overall structure is more stable when in use, and the accommodating cavity can facilitate the connection part to be assembled into the outer cover.

[0006] The present invention is further configured as follows: the hook comprises a reverse hook and an easy-folding piece, which are arranged opposite to each other in front and behind, the reverse hook passes through the bottom plate and is hooked on the bottom of the bottom plate, the easy-folding piece passes through the bottom plate and can be folded to be hooked on the bottom of the bottom plate, and the reverse hook and the easy-folding piece cooperate to achieve a tight fit between the bottom plate, the inner lining and the outer cover.

[0007] With the above further arrangement, during assembly, the inverted hook can be first arranged at the bottom of the bottom plate, and then the easy-folding piece can be folded to make it contact with the bottom of the bottom plate to achieve assembly, which is more convenient during assembly and more stable during use.

[0008] The present invention is further provided that: the outer edge of the mounting portion is bent downward to form an inner lining support foot, and the inner lining support foot is provided flush with the lower end surface of the outer cover.

[0009] By further adopting the above arrangement, the height of the mounting portion can be raised by forming an inner lining support foot through the bending of the outer edge of the mounting portion, so that the inner lining support foot can be flush with the lower end surface of the outer cover, making it more stable when in use, and the thickness of the base plate can be reduced, thereby reducing its manufacturing cost.

[0010] The present invention is further configured as follows: the lining support feet are surrounded to form a base plate assembly chamber for base plate assembly; the base plate located in the base plate assembly chamber is provided with a base plate extension portion extending toward the lining support feet; the base plate extension portion is fitted with the bottom of the mounting portion; and the easy-folding piece can be folded outward to the bottom of the base plate extension portion.

[0011] By further adopting the above-mentioned arrangement, the base plate assembly chamber can facilitate the assembly of the base plate, the base plate extension plate extends toward the lining support foot to increase the strength of its structure, and can also adapt to the contour of the base plate assembly chamber to prevent the base plate from sliding sideways, and the easy-folding piece is folded outward until it can abut against the bottom of the base plate extension part, which can prevent a gap from being generated between the base plate extension part and the mounting part, making the overall effect better and more stable when used.

[0012] The present invention is further configured as follows: the connecting portion bulges upward in an inverted U-shape to form a U-shaped cavity, and both ends of the connecting portion are respectively connected to corresponding mounting portions to form a supporting structure.

[0013] With the above further configuration, the connecting portion is configured in an inverted U shape to form a U-shaped cavity, which can facilitate the assembly of the lock tongue and the spring, and a supporting structure is formed at both ends of the connecting portion, thereby making it more stable when in use.

[0014] The present invention is further configured as follows: the bottom plate and the head of the mounting portion are both provided with a snap-in groove for the inverted hook to be inserted during assembly, the snap-in grooves of the two are overlapped, and the bottom plate and the mounting portion are also provided with a through groove for the easy-folding piece to pass through at a position corresponding to the easy-folding piece.

[0015] By further configuring as above, the inverted hook can pass through the bottom plate through the snap-fitting groove during assembly, and then the snap-fitting groove is butted against the hook groove of the inverted hook. The snap-fitting groove can also provide an escape space when the liner with the bottom plate is assembled with the outer cover, thereby facilitating the assembly of the liner with the bottom plate. The through groove can facilitate the easy-folding piece on the outer cover to pass through the bottom plate, so that the easy-folding piece directly contacts the bottom of the bottom plate when being bent.

[0016] The present invention is further configured as follows: the inverted hook and the easy-folding piece form a group of limit structures, and the outer cover is provided with two groups of limit structures.

[0017] The above further configuration makes the locking effect better and the use more stable.

[0018] The present invention is further configured as follows: a blocking piece for the locking tongue to pass through is integrally arranged on or at the end of the U-shaped cavity.

[0019] With the above further arrangement, the blocking piece cooperates with the outer cover to guide the lock tongue when it slides, preventing it from falling off, facilitating its sliding, and also facilitating the resistance of the return spring, making it more stable and convenient to assemble.

[0020] Another embodiment of the present invention discloses a method for manufacturing a housing, which is characterized by comprising at least the following molding processes:

[0021] Bottom plate forming process: the bottom plate is formed by punching the original plate, and a clamping groove a and an avoidance groove are opened on the bottom plate, and then the head and tail of the bottom plate are punched to bend downward to form the bottom plate support feet;

[0022] The outer cover forming process is as follows: the original plate is punched to form a cross-shaped plate body, a hole is punched at the head of the cross-shaped plate body to open an inlet and outlet for the lock tongue to enter and exit the outer cover, and holes and trims are punched on both sides of the cross-shaped plate body to form a hook, an easy-folding piece and an axial hole for the shaft body to pass through, and at the same time, a hole is punched in the middle of the cross-shaped plate body to form a long slot hole for the pull ring to swing and pass through the outer cover, and finally the head, tail and both sides of the cross-shaped plate body are punched and bent to form the outer cover;

[0023] Liner forming process: the original plate is punched to form the liner plate, and a baffle for the return spring to abut or connect and a clamping groove b for the hook to be inserted are formed on the liner plate, and then the liner plate is bent by punching to form the liner, and the formed liner includes a connecting portion and a mounting portion, the middle of the connecting portion is hollowed out to form a sliding cavity, the baffle is bent onto the sliding cavity, and a through hole for the lock tongue to pass through is opened on the baffle, the outer edge of the mounting portion is bent downward to form a liner support foot, and the connecting portion is located behind the liner support foot and a tail wing is also provided, the lower surface of the tail wing is flush with the lower surface of the liner support foot, and the liner support foot surrounds to form a bottom plate assembly chamber;

[0024] The assembly molding process is to assemble the base plate into the base plate assembly chamber. At this time, the snap-in groove a and the snap-in groove b are overlapped together, and then the outer cover is taken, and the inverted hook of the outer cover is connected with the snap-in groove a and the snap-in groove b, and then the lining is driven to flip over, and the connecting part enters the outer cover. At this time, the inverted hook is set on the base plate, and then the easy-folding piece is located on one side of the bottom of the base plate, so as to realize the connection between the base plate, the inner lining and the outer cover, thereby forming the shell.

[0025] A further configuration of the present invention is that the portion of the inverted hook used to hook the bottom of the bottom plate is arranged in an arc shape.

[0026] In summary, the shell manufacturing method has the following beneficial effects: the outer cover, the bottom plate and the lining are processed separately to reduce the difficulty of the processing technology, thereby reducing the manufacturing cost. During assembly, the bottom plate is assembled to the bottom plate assembly chamber to form a whole, and then the whole is assembled to the outer cover, making it more convenient to assemble. The inverted hook on the outer cover will be hooked on the bottom of the bottom plate. At this time, the bottom plate acts as a gasket, so that the lining can be pressed on the outer cover, and then the easy-folding piece is folded outward or inward so that the easy-folding piece is pressed against the bottom of the bottom plate, and locked with the inverted hook, thereby locking the outer cover to prevent the outer cover from shaking relative to the lining. Because the connecting part and the mounting part on the lining are integrated, the connecting part will not shake relative to the mounting part, so that the overall structure is more stable when in use, and the accommodating cavity can facilitate the connection part to be assembled into the outer cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the application structure of Example 1 of the present invention;

[0028] Figure 2 This is a schematic diagram of the shell structure of Example 1 of the present invention;

[0029] Figure 3 This is a diagram showing the coordination between the lining and the base plate of Example 1 of the present invention;

[0030] Figure 4 This is a schematic diagram of the outer cover structure of Example 1 of the present invention;

[0031] Figure 5 This is a schematic diagram of the bottom structure of the inner liner according to Embodiment 1 of the present invention;

[0032] Figure 6 This is a schematic diagram of the bottom plate structure of Example 1 of the present invention;

[0033] Figure 7 This is a schematic diagram of the bottom structure of the housing according to Embodiment 1 of the present invention;

[0034] Figure 8 This is a schematic diagram of the shell structure of Example 2 of the present invention;

[0035] Fig. 9 This is a diagram showing the coordination between the lining and the base plate of Example 2 of the present invention;

[0036] Fig.10 This is a schematic diagram of the outer cover structure of Example 2 of the present invention;

[0037] Fig.11 This is a schematic diagram of the bottom structure of the inner liner according to embodiment 2 of the present invention;

[0038] Fig.12 This is a schematic diagram of the bottom plate structure of Example 2 of the present invention. DETAILED DESCRIPTION

[0039] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings:

[0040] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "bottom", "top", "front", "back", "inside", "outside", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, the terms "connection", "communication", "connected" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, an integral connection, or a detachable connection; it can be the internal connection of two elements; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Example

[0042] The present invention discloses a split type bolt housing, including a split bottom plate 11 and an outer cover 12. In the embodiment of the present invention, an inner lining 13 is also included. The inner lining 13 includes two mounting parts 132 arranged opposite to each other and a connecting part 131 connected between the two mounting parts 132 so as to connect them into one. The outer cover 12 is hollow inside to form a receiving cavity for the connecting part 131 to enter. The bottom plate 11 is located below the mounting parts 132 and the connecting part 131 and contacts the bottom of the mounting parts 132. The outer cover 12 is provided with a hook 2 for hooking at the bottom of the bottom plate 11 to achieve a tight fit between the bottom plate 11, the inner lining 13 and the outer cover 12. The outer cover 12, the bottom plate 11 and the inner lining 13 are processed in a split manner to reduce the difficulty of the processing technology, thereby reducing the manufacturing cost. When assembling, the bottom plate 11 is assembled to the lining 13 to form a whole, and then the whole is assembled to the outer cover 12, so that it is more convenient to assemble. When in use, the mounting portion 132 is installed through the fixing piece. The hook 2 on the outer cover 12 will be hooked at the bottom of the bottom plate 11. At this time, the bottom plate 11 acts as a gasket, so that the lining 13 can be pressed on the outer cover 12, so as to be locked, thereby preventing the outer cover 12 from shaking relative to the lining 13. Because the connecting portion 131 and the mounting portion 132 on the lining 13 are integrated, the connecting portion 131 will not shake relative to the mounting portion 132, so that its overall structure is more stable when in use, and the accommodating cavity can facilitate the connection portion 131 to be assembled into the outer cover 12.

[0043] The hook 2 includes a reverse hook 21 and an easy-folding piece 22, which are arranged opposite to each other in front and behind. The reverse hook 21 passes through the bottom plate 11 and is hooked on the bottom of the bottom plate 11. The easy-folding piece 22 passes through the bottom plate 11 and can be folded to be hooked on the bottom of the bottom plate 11. The reverse hook 21 and the easy-folding piece 22 cooperate to achieve a tight fit between the bottom plate 11, the lining 13 and the outer cover 12. When assembling, the reverse hook 21 can be hooked on the bottom of the bottom plate 11 first, and then the easy-folding piece 22 can be folded to make it contact with the bottom of the bottom plate 11 to achieve assembly. It is more convenient to assemble and more stable when used.

[0044] The outer edge of the mounting portion 132 is bent downward to form an inner lining support foot 1321, and the inner lining support foot 1321 is arranged flush with the lower end surface of the outer cover 12. The inner lining support foot 1321 formed by bending the outer edge of the mounting portion 132 can raise the height of the mounting portion 132, so that the inner lining support foot 1321 can be flush with the lower end surface of the outer cover 12, making it more stable when in use, and can reduce the thickness of the base plate 11, thereby reducing its manufacturing cost.

[0045] The lining support foot 1321 is surrounded to form a bottom plate assembly chamber 133 for assembling the bottom plate 11. The bottom plate 11 located in the bottom plate assembly chamber 133 is provided with a bottom plate extension portion 112 extending toward the lining support foot 1321. The bottom plate extension portion 112 is fitted with the bottom of the mounting portion 132. The easy-folding piece 22 can be folded outward to the bottom of the bottom plate extension portion 112. The bottom plate assembly chamber 133 can facilitate the assembly of the bottom plate 11. The bottom plate extension plate z extends toward the lining support foot 1321 to increase the strength of its structure, and can also adapt to the contour of the bottom plate assembly chamber 133 to prevent the bottom plate 11 from sliding sideways. The easy-folding piece 22 is folded outward to abut against the bottom of the bottom plate extension portion 112, which can prevent a gap from being generated between the bottom plate extension portion 112 and the mounting portion 132, making it have a better overall effect and more stable when used.

[0046] The connecting portion 131 bulges upward in an inverted U shape to form a U-shaped cavity. The two ends of the connecting portion 131 are respectively connected to the corresponding mounting portions 132 to form a supporting structure. The U-shaped cavity can facilitate the assembly of the locking tongue and the spring, and the two ends of the connecting portion 131 will form a supporting structure, thereby making it more stable when in use.

[0047] The base plate 11 and the head of the mounting portion 132 are both provided with a snap-in groove 3 for the inverted hook 21 to be inserted during assembly. The snap-in grooves 3 of the two are overlapped, and the base plate 11 and the mounting portion 132 are also provided with a through groove 4 for the easy-folding piece 22 to pass through at the corresponding position. During assembly, the inverted hook 21 can pass through the base plate 11 through the snap-in groove 3, and then the snap-in groove 3 is docked with the hook groove of the inverted hook 21. The snap-in groove 3 can also provide an avoidance space when the lining 13 with the base plate 11 and the outer cover 12 are assembled, thereby facilitating the assembly of the lining 13 with the base plate 11. The through groove 4 can facilitate the easy-folding piece 22 on the outer cover 12 to pass through the base plate 11, so that the easy-folding piece 22 directly contacts the bottom of the base plate 11 when it is bent.

[0048] The inverted hook 21 and the easy-folding piece 22 form a set of limiting structures. The outer cover 12 is provided with two sets of limiting structures, so that the locking effect is better and the use is more stable.

[0049] A blocking piece 1311 for the lock tongue to pass through is integrally provided on or at the end of the U-shaped cavity. The blocking piece 1311 cooperates with the outer cover 12 to guide the lock tongue when it slides, prevents the lock tongue from falling, facilitates its sliding, and also facilitates the resistance of the return spring, making it more stable and convenient when assembled. Example

[0050] The present invention discloses a shell manufacturing method, which is characterized by at least comprising the following molding processes:

[0051] The bottom plate forming process is to stamp the original plate into a bottom plate 1', and to open a clamping groove a12' and an avoidance groove 11' on the bottom plate 1', and then to bend the head and tail of the bottom plate 1' downwardly to form a bottom plate support foot 13';

[0052] The outer cover forming process is as follows: the original plate is punched to form a cross-shaped plate body, a hole is punched at the head of the cross-shaped plate body to open an inlet and outlet 21' for the lock tongue to enter and exit the outer cover 2', and the two side wings of the cross-shaped plate body are punched and trimmed to form a hook 22', an easy-folding piece 23' and an axial hole 24' for the shaft body to pass through. At the same time, a hole is punched in the middle of the cross-shaped plate body to form a long slot 25' for the pull ring to swing and pass through the outer cover 2', and finally the head, tail and two side wings of the cross-shaped plate body are punched and bent to form the outer cover 2';

[0053] Liner forming process: the original plate is punched to form the liner plate, and a baffle 31' for the return spring to contact or connect and a clamping groove b32' for the hook 22' to be inserted are formed on the liner plate, and then the liner plate is bent by punching to form the liner 3', and the formed liner 3' includes a connecting portion 33' and a mounting portion 34', the middle of the connecting portion 33' is hollowed out to form a sliding cavity, the baffle 31' is bent onto the sliding cavity, and a through hole 35' is provided on the baffle 31' for the lock tongue to pass through, the outer edge of the mounting portion 34' is bent downward to form a liner support foot 36', and the connecting portion 33' is located behind the liner support foot 36' and a tail wing 37' is further provided, the lower surface of the tail wing 37' is flush with the lower surface of the liner support foot 36', and the liner support foot 36' surrounds to form a bottom plate assembly chamber 38';

[0054] In the assembly molding process, the base plate 1' is assembled into the base plate assembly chamber 38', at which time the snap-in groove a12' and the snap-in groove b32' are overlapped together, and then the outer cover 2' is taken, and the inverted hook 22' of the outer cover 2' is docked with the snap-in groove a12' and the snap-in groove b32', and then the lining 3' with the base plate 1' is driven to flip over, and the connecting portion 33' is made to enter the outer cover 2'. At this time, the inverted hook 22' is hooked on the base plate 1', and then the easy-folding piece 23' is located at the bottom of the base plate 1', so as to realize the connection between the base plate, the inner lining and the outer cover, thereby forming the shell 10'. When locking is required, the easy-folding piece 23' only needs to be folded outward to lock it.

[0055] A further configuration of the present invention is that the portion of the barb 22 ′ used for hooking the bottom of the bottom plate 1 ′ is arranged in an arc shape.

[0056] In summary, the shell manufacturing method has the following beneficial effects: the outer cover 2', the bottom plate 1' and the inner liner 3' are processed separately to reduce the difficulty of the processing technology, thereby reducing the manufacturing cost. During assembly, the bottom plate 1' is assembled to the bottom plate assembly chamber 38' to form a whole, and then the whole is assembled to the outer cover 2', making it more convenient to assemble. In addition, the hook 22' on the outer cover 2' will be hooked at the bottom of the bottom plate 1'. At this time, the bottom plate 1' acts as a gasket, making it The lining 3' can be pressed onto the outer cover 2', and then the easy-folding piece 23' can be folded outward or inward so that the easy-folding piece 23' is pressed against the bottom of the bottom plate 1', and cooperates with the inverted hook 22' to achieve locking, thereby locking the outer cover 2', thereby preventing the outer cover 2' from shaking relative to the lining 3', and because the connecting portion 33' and the mounting portion 34' on the lining 3' are integrated, the connecting portion 33' will not shake relative to the mounting portion 34', thereby making its overall structure more stable when in use.

Claims

1. A split type bolt housing, comprising a split bottom plate and an outer cover, characterized in that: The outer cover is provided with a hook for hooking at the bottom of the bottom plate to make the bottom plate, the inner lining and the outer cover fit tightly together. The hook comprises a reverse hook and an easy-folding piece, the reverse hook and the easy-folding piece are arranged opposite to each other in front and behind, the reverse hook passes through the bottom plate and is hooked at the bottom of the bottom plate, the easy-folding piece passes through the bottom plate and can be folded to be hooked at the bottom of the bottom plate, and the reverse hook and the easy-folding piece cooperate to achieve the tight fit of the bottom plate, the inner lining and the outer cover.

2. A split type latch housing according to claim 1, characterized in that: The outer edge of the mounting portion is bent downward to form an inner liner support foot, and the inner liner support foot is arranged flush with the lower end surface of the outer cover.

3. A split type latch housing according to claim 2, characterized in that: The lining support feet surround and form a base plate assembly chamber for base plate assembly. The base plate located in the base plate assembly chamber is provided with a base plate extension portion extending toward the lining support feet. The base plate extension portion is fitted with the bottom of the mounting portion, and the easy-folding piece can be folded outward to the bottom of the base plate extension portion.

4. A split type latch housing according to claim 1, 2 or 3, characterized in that: The connecting portion bulges upward in an inverted U shape to form a U-shaped cavity, and two ends of the connecting portion are respectively connected to the corresponding mounting portions to form a supporting structure.

5. A split type latch housing according to claim 4, characterized in that: The inverted hook and the easy-folding piece form a set of limiting structures, and the outer cover is provided with two sets of upper limit structures.

6. A split type latch housing according to claim 5, characterized in that: The bottom plate and the head of the mounting part are both provided with a clamping groove for the inverted hook to be inserted during assembly, and the clamping grooves of the two are arranged in an overlapping manner. The bottom plate and the mounting part are also provided with a through groove for the easy-folding piece to pass through at the corresponding position.

7. A split type latch housing according to claim 6, characterized in that: A blocking piece for the locking tongue to pass through is integrally arranged on the U-shaped cavity or at the end thereof.

8. A method for manufacturing a split type latch housing as claimed in any one of claims 1 to 7, characterized in that: At least the following molding processes are included: Bottom plate forming process: the bottom plate is formed by punching the original plate, and a clamping groove a and an avoidance groove are opened on the bottom plate, and then the head and tail of the bottom plate are punched to bend downward to form the bottom plate support feet; The outer cover forming process is as follows: the original plate is punched to form a cross-shaped plate body, a hole is punched at the head of the cross-shaped plate body to open an inlet and outlet for the lock tongue to enter and exit the outer cover, and holes and trims are punched on both sides of the cross-shaped plate body to form a hook, an easy-folding piece and an axial hole for the shaft body to pass through, and at the same time, a hole is punched in the middle of the cross-shaped plate body to form a long slot hole for the pull ring to swing and pass through the outer cover, and finally the head, tail and both sides of the cross-shaped plate body are punched and bent to form the outer cover; Liner forming process: the original plate is punched to form the liner plate, and a baffle for the return spring to abut or connect and a clamping groove b for the hook to be inserted are formed on the liner plate, and then the liner plate is bent by punching to form the liner, and the formed liner includes a connecting portion and a mounting portion, the middle of the connecting portion is hollowed out to form a sliding cavity, the baffle is bent onto the sliding cavity, and a through hole for the lock tongue to pass through is opened on the baffle, the outer edge of the mounting portion is bent downward to form a liner support foot, and the connecting portion is located behind the liner support foot and a tail wing is also provided, the lower surface of the tail wing is flush with the lower surface of the liner support foot, and the liner support foot surrounds to form a bottom plate assembly chamber; The assembly molding process is to assemble the base plate into the base plate assembly chamber. At this time, the snap-in groove a and the snap-in groove b are overlapped together, and then the outer cover is taken, and the inverted hook of the outer cover is connected with the snap-in groove a and the snap-in groove b, and then the lining is driven to flip over, and the connecting part enters the outer cover. At this time, the inverted hook is set on the base plate, and then the easy-folding piece is located on one side of the bottom of the base plate, so as to realize the connection between the base plate, the inner lining and the outer cover, thereby forming the shell.

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