Internal expansion fixed rivet

Abstract

The utility model discloses an internal expansion fixed rivet, which relates to the field of rivets, and comprises a rivet handle, a plurality of uniformly distributed expansion lobes are fixedly arranged below the rivet handle, the plurality of expansion lobes form a cylinder, and an expansion gap is formed between every two adjacent expansion lobes. At the moment, a positive tapping half thread is meshed with a first matching thread again, then a straightening inner ring piece and a straightening outer ring piece are driven to move downwards, meanwhile, a rivet expansion cap and a sliding ring also move downwards along with rotation of a first screw, and the straightening inner ring piece and the straightening outer ring piece move downwards so that a plurality of expansion leaves can be straightened through a straightening groove; according to the rivet, the expansion lobes are changed into the initial state, then the whole rivet can be taken out from the interior of the prefabricated hole, the structure is simple, fastening and dismounting of the rivet can be achieved only by changing the rotating direction, the dismounted rivet can be used for the second time, and the rivet is low in manufacturing cost, high in applicability and capable of being repeatedly used.

Description

Technical Field

[0001] The utility model relates to the field of rivets, in particular to an internal expansion fixed rivet. Background Art

[0002] Commonly used rivets include R-type rivets, fan rivets, blind rivets (core rivets), tree rivets, semi-circular heads, flat heads, semi-hollow rivets, solid rivets, countersunk rivets, blind rivets, and hollow rivets. These usually use their own deformation to connect the riveted parts. Generally, cold rivets are used for those smaller than 8 mm, and hot rivets are used for those larger than this size. But there are exceptions, such as the nameplates on some locks, which are riveted using the interference between the rivet and the lock body hole.

[0003] Traditional rivets are complicated to disassemble after installation, and may even be impossible to disassemble, and can only be disassembled by destruction, making rivets disposable and increasing the cost of the enterprise.

[0004] Therefore, it is necessary to propose an internal expansion fixed rivet to solve the above problems. Utility Model Content

[0005] The utility model aims to provide an internal expansion fixed rivet to solve the problem that the rivet is difficult to disassemble or cannot be disassembled.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an internal expansion fixed rivet, comprising a rivet shank, a plurality of evenly distributed expansion lobes are fixedly installed below the rivet shank, the plurality of expansion lobes form a cylindrical body, and an expansion gap is formed between two adjacent expansion lobes, a first screw is clamped in the middle of the rivet shank, a screw rod is fixedly installed at the lower end of the first screw, a positive half thread is provided in the lower half of the screw rod, a straightening inner ring is slidably clamped inside the cylindrical body, a straightening outer ring is sleeved on the outside of the straightening inner ring, a plurality of connecting rods are fixedly installed between the straightening inner ring and the straightening outer ring, and the connecting rods are slidably clamped inside the corresponding expansion gaps.

[0007] Preferably, the middle part of each of the first screw and the screw rod is provided with an installation groove penetrating through the first screw and a full counter-thread is provided on the installation groove. A rotating plate is fixedly installed on the lower surface of the first screw and the rotating plate is located at the outer circle of the screw rod. The upper surface of the rivet handle is provided with a rotating groove corresponding to the rotating plate and the rotating plate is rotatably clamped inside the rotating groove.

[0008] Preferably, a rivet expansion cap is provided below the cylindrical body, and an upper surface of the rivet expansion cap is provided with an inclined surface, which fits with the bottom surfaces of the multiple expansion lobes, and the bottom end of the expansion gap is also provided with an inclined surface used in conjunction with the rivet expansion cap.

[0009] Preferably, a sliding ring is fixedly mounted on the upper surface of the rivet expansion cap, and a second mating thread for use with the forward tapping half thread is provided in the middle of the sliding ring.

[0010] Preferably, a first mating thread for use with the forward-tapping half thread is provided in the middle of the straightened inner ring member.

[0011] Preferably, a plurality of straightening grooves are formed between the straightening inner ring member, the straightening outer ring member and the connecting rod, a plurality of the expansion vanes are slidably clamped in the corresponding straightening grooves, and a limit block is fixedly installed at the bottom end of the expansion gap.

[0012] Preferably, the interior of the mounting groove is threadedly connected with a second screw.

[0013] The technical effects of the utility model are:

[0014] Rotate the first screw in the opposite direction, and the tapping half thread will re-engage with the first matching thread, and then drive the straightened inner ring and the straightened outer ring to move downward. At the same time, the rivet expansion cap and the sliding ring also move downward with the rotation of the first screw. The straightened inner ring and the straightened outer ring move downward so that the straightening groove straightens the multiple expansion petals, so that the expansion petals return to the initial state, and then the rivet can be taken out of the prefabricated hole as a whole. The structure is simple, and the rivet can be tightened and disassembled by only changing the rotation direction. The disassembled rivet can be reused, with low manufacturing cost, high applicability and reusability.

[0015] After the rivet is installed into the interior of the corresponding target, the second screw is screwed into the interior of the installation groove. Because the reverse full thread and the forward half thread are reverse threads, turning the second screw will not cause the first screw to loosen, but will make the first screw tighter. When the rivet is used to connect the plate, the second screw can fix another different plate or perform other connecting functions. When the rivet is used as a wall, the second screw can be used to connect other structural members or be used as a carrier. Therefore, the device is no longer limited to the use of rivets, and the device can also be used as a carrier for carrying objects or connecting other structural members, making the device more applicable. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the internal expansion fixed rivet of the utility model.

[0017] Figure 2 It is a schematic structural diagram of the first screw and the screw rod in the utility model.

[0018] Figure 3 It is a schematic diagram of the connection structure of the expansion vane, the straightened inner ring and the rivet expansion cap in the utility model.

[0019] Figure 4 The utility model is a schematic diagram of the connection structure of the straightened inner ring member, the straightened outer ring member and the connecting rod.

[0020] In the figure: 1, rivet handle; 2, expansion leaf; 3, first screw; 4, straighten the inner ring; 5, rivet expansion cap; 6, second screw; 101, rotation groove; 201, expansion gap; 300, screw rod; 301, rotation plate; 302, forward attack half thread; 303, installation groove; 304, reverse attack full thread; 401, straighten the outer ring; 402, connecting rod; 403, straighten the groove; 404, first matching thread; 501, sliding ring; 502, second matching thread. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] like Figure 1-4 As shown, the utility model provides an internal expansion fixed rivet, including a rivet shank 1, a plurality of evenly distributed expansion lobes 2 are fixedly installed below the rivet shank 1, the plurality of expansion lobes 2 form a cylindrical body, a rivet expansion cap 5 is provided below the cylindrical body, an expansion gap 201 is formed between two adjacent expansion lobes 2, a first screw 3 is clamped in the middle of the rivet shank 1, a screw rod 300 is fixedly installed at the lower end of the first screw 3, a positive attack half thread 302 is provided at the lower half of the screw rod 300, when in use, a sliding ring 501 is fixedly installed on the upper surface of the rivet expansion cap 5, a second matching thread 502 used in conjunction with the positive attack half thread 302 is provided in the middle of the sliding ring 501, an inclined surface is provided on the upper surface of the rivet expansion cap 5, the inclined surface is in contact with the bottom surfaces of the plurality of expansion lobes 2, and an inclined surface used in conjunction with the rivet expansion cap 5 is also provided at the bottom end of the expansion gap 201.

[0023] In actual use, the rivet is first inserted into the prefabricated hole. The riveted object can be a wall or multiple plates. Then the first screw 3 is rotated in the forward direction. At this time, the rivet expansion cap 5 and the sliding ring 501 are moved up under the drive of the forward tapping half thread 302. Because the upper surface of the rivet expansion cap 5 is an inclined surface, the rivet expansion cap 5 will enter the interior of the cylindrical body. At this time, the rivet expansion cap 5 squeezes the cylindrical body, causing multiple expansion petals 2 to expand along the direction of the expansion gap 201, thereby riveting the plate or firmly clamping itself inside the wall.

[0024] A straightening inner ring 4 is slidably clamped inside the cylindrical body, a first mating thread 404 for use with the forward attack semi-thread 302 is opened in the middle of the straightening inner ring 4, a straightening outer ring 401 is sleeved on the outside of the straightening inner ring 4, a plurality of connecting rods 402 are fixedly installed between the straightening inner ring 4 and the straightening outer ring 401, the connecting rods 402 are slidably clamped inside the corresponding expansion gap 201, a plurality of straightening grooves 403 are formed between the straightening inner ring 4, the straightening outer ring 401 and the connecting rods 402, a plurality of expansion vanes 2 are slidably clamped inside the corresponding straightening grooves 403, and a limiting block is fixedly installed at the bottom end of the expansion gap 201.

[0025] When the first screw 3 rotates in the forward direction, the straightened inner ring member 4 will move to the upper end of the first screw 3 with the rotation of the first screw 3. At this time, the first matching thread 404 slides out from the forward attacking half thread 302, so that the forward attacking half thread 302 loses support for the straightened inner ring member 4, and then the straightened inner ring member 4 will remain at the upper end of the first screw 3. When the rivet needs to be removed, it is only necessary to rotate the first screw 3 in the reverse direction. At this time, the forward attacking half thread 302 re-engages with the first matching thread 404, and then drives the straightened inner ring member 4 and the straightened inner ring member 4 to move. The straight outer ring 401 moves downward, and at the same time, the rivet expansion cap 5 and the sliding ring 501 also move downward with the rotation of the first screw 3. The straightened inner ring 4 and the straightened outer ring 401 move downward so that the straightening groove 403 straightens the multiple expansion petals 2, so that the expansion petals 2 become the initial state, and then the rivet can be taken out from the inside of the prefabricated hole as a whole. The structure is simple, and the rivet can be tightened and disassembled by only changing the rotation direction. The disassembled rivet can be reused, with low manufacturing cost, high applicability and reusability.

[0026] It should be noted that when the first screw 3 continues to rotate in the opposite direction, the straightened inner ring 4 will eventually be carried by the limit block at the bottom of the expansion gap 201 to reach the maximum position. At this time, the rivet expansion cap 5 is detached from the screw rod 300, and the sliding ring 501 is clamped by multiple expansion petals 2. When used again, first rotate the first screw 3 to move the straightened inner ring 4 to the upper end of the screw rod 300, and then press the rivet expansion cap 5 to re-establish the connection between the second mating thread 502 and the forward attack half thread 302, so that it can be used for a second time.

[0027] The middle part of the first screw 3 and the screw rod 300 are both provided with a mounting groove 303 that penetrates through themselves, the interior of the mounting groove 303 is connected with the second screw 6 through a thread, the mounting groove 303 is provided with a counter-attack full thread 304, and a rotating plate 301 is fixedly installed on the lower surface of the first screw 3, and the rotating plate 301 is located at the outer circle of the screw rod 300. The upper surface of the rivet handle 1 is provided with a rotating groove 101 corresponding to the rotating plate 301, and the rotating plate 301 is rotatably clamped inside the rotating groove 101.

[0028] After the rivet is installed into the interior of the corresponding target, the second screw 6 is screwed into the interior of the installation groove 303. Because the counter-attack full thread 304 and the forward-attack half thread 302 are reverse threads, rotating the second screw 6 will not cause the first screw 3 to loosen, but will make the first screw 3 tighter, so that when the rivet is used to connect the plate, the second screw 6 can fix another different plate or perform other connecting functions. When the rivet is used as a wall, the second screw 6 can be used to connect other structural members or be used as a carrier, so that the device is no longer limited to the use of rivets, and the device can also be used as a carrier for carrying objects or connecting other structural members, making the device more applicable.

Claims

1. An internal expansion fixed rivet, characterized in that: It comprises a rivet shank (1), a plurality of uniformly distributed expansion lobes (2) are fixedly mounted below the rivet shank (1), the plurality of expansion lobes (2) form a cylindrical body, an expansion gap (201) is formed between two adjacent expansion lobes (2), a first screw (3) is clamped in the middle of the rivet shank (1), a screw rod (300) is fixedly mounted at the lower end of the first screw (3), a positive tapping half thread (302) is provided in the lower half of the screw rod (300), a straightening inner ring member (4) is slidably clamped inside the cylindrical body, a straightening outer ring member (401) is sleeved on the outside of the straightening inner ring member (4), a plurality of connecting rods (402) are fixedly mounted between the straightening inner ring member (4) and the straightening outer ring member (401), and the connecting rods (402) are slidably clamped inside the corresponding expansion gaps (201).

2. The internal expansion fixed rivet according to claim 1, characterized in that: The middle parts of the first screw (3) and the screw rod (300) are each provided with a mounting groove (303) penetrating through the first screw (3) and a full counter-attack thread (304) is provided on the mounting groove (303). A rotating plate (301) is fixedly mounted on the lower surface of the first screw (3), and the rotating plate (301) is located at the outer ring of the screw rod (300). The upper surface of the rivet handle (1) is provided with a rotating groove (101) corresponding to the rotating plate (301), and the rotating plate (301) is rotatably clamped inside the rotating groove (101).

3. The internal expansion fixed rivet according to claim 1, characterized in that: A rivet expansion cap (5) is provided below the cylindrical body, and an upper surface of the rivet expansion cap (5) is provided with an inclined surface, the inclined surface is fitted with the bottom surfaces of the plurality of expansion lobes (2), and the bottom end of the expansion gap (201) is also provided with an inclined surface used in conjunction with the rivet expansion cap (5).

4. The internal expansion fixed rivet according to claim 3, characterized in that: A sliding ring (501) is fixedly mounted on the upper surface of the rivet expansion cap (5), and a second matching thread (502) for use with the forward-tapping half thread (302) is provided in the middle of the sliding ring (501).

5. The internal expansion fixed rivet according to claim 1, characterized in that: A first matching thread (404) for use with the forward-tapping half thread (302) is provided in the middle of the straightened inner ring member (4).

6. The internal expansion fixed rivet according to claim 1, characterized in that: A plurality of straightening grooves (403) are formed between the straightening inner ring member (4), the straightening outer ring member (401) and the connecting rod (402); a plurality of the expansion vanes (2) are slidably mounted inside the corresponding straightening grooves (403); and a limit block is fixedly installed at the bottom end of the expansion gap (201).

7. The internal expansion fixed rivet according to claim 2, characterized in that: The interior of the installation groove (303) is connected with a second screw (6) via threads.

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