Automatic take-up automotive safety tensioner

Abstract

An automatic take-up automobile safety tensioning device, comprising a main machine and a binding belt, the main machine comprising a seat body assembly, a handle assembly and a take-up assembly, the take-up assembly comprising a take-up shaft installed on the seat body and capable of rotating under the drive of the handle assembly, the binding belt being connected to the take-up shaft, one end of the take-up shaft extending out of the seat body, a take-up spring assembly being arranged at the extending end of the take-up shaft, the take-up spring assembly comprising a take-up spring, a take-up spring box and a sealing cover, the take-up spring box and the sealing cover being fixed on the side wall of the main machine, the take-up spring box and the sealing cover surrounding an installation cavity, the extending end of the take-up shaft extending into the installation cavity, the take-up spring being arranged in the installation cavity and being installed on the take-up shaft. The take-up spring of the automatic take-up automobile safety tensioning device is arranged in the installation cavity surrounded by the take-up spring box and the sealing cover, on the one hand, rainwater can be prevented from entering the take-up spring box to corrode the take-up spring, the risk of the take-up spring breaking after corrosion is reduced, the service life of the product is improved, on the other hand, the risk of the take-up spring accidentally springing out to hurt people when disassembled is also reduced, the use is safer.

Description

Technical Field

[0001] This utility model relates to a vehicle safety tensioning device for securing and fastening goods on vehicles such as automobiles, trailers, airplanes, and ships, and in particular to an automatic retractable vehicle safety tensioning device. Background Technology

[0002] Automotive safety tensioning devices typically consist of a main unit and long and short straps. The straps are usually flat webbing, with or without hooks. The main unit uses an anti-reverse ratchet mechanism; a handle drives a pawl, which in turn pushes a ratchet. The ratchet then drives the main shaft, tightening the straps wrapped around it. A stop plate prevents the ratchet from reversing, maintaining tension on the straps to secure the cargo. However, the working length of the device varies depending on the application, often resulting in excess straps dangling outside the device, posing a safety hazard and creating a mess after use, which can affect future use.

[0003] Current technology includes automatic strap tensioning devices that solve the aforementioned problems by using a ratchet strap reel and a spring to store energy for automatic strap rewinding. The spring in these devices is typically made of spring steel and housed in an open-type spring box. The outer hook of the spring is fixed to the circumferential side wall of the spring box, while the inner hook is centered and connected to the strap shaft. One end of the strap shaft extends outward from the main unit of the tensioning device, and the open side of the spring box is flush against the outer side of the main unit (which could be the outer side of the handle or seat, depending on the main unit's structure). The inner hook of the spring connects to the extended end of the strap shaft. The spring box is usually fixed to the main unit with rivets or screws. Theoretically, its open end should fit snugly against the side of the main unit, but in actual assembly, a complete seal is difficult to achieve, resulting in gaps. Since automotive safety tensioning devices are mostly used outdoors, rainwater or melted snow can enter the spring box through these gaps during rainy or snowy weather, causing the spring to corrode. When a coil spring corrodes, its material structure, mechanical properties, and stress state are all damaged, forming micro-crack initiations and exacerbating stress concentration. This makes it prone to breakage during use, ultimately causing the automatic retraction function to fail. Furthermore, this type of open-type coil spring box poses a safety risk, as the spring may pop out during assembly, installation, or disassembly for maintenance. The sharp edges of the spring could cut the operator's skin or even injure vital organs such as the face.

[0004] In conclusion, further improvements are needed to the existing automatic retraction vehicle safety tensioning device with coil spring. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide an automatic car safety tensioning device that can prevent water from entering the coil spring box and reduce the risk of injury from the coil spring popping out during installation or disassembly, in light of the above-mentioned existing technology.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: an automatic retractable car safety tensioning device, including a main unit and a strap, wherein the main unit includes a base assembly, a handle assembly and a strap assembly, the base assembly includes a base, the strap assembly includes a strap shaft mounted on the base and rotatable under the drive of the handle assembly, and the strap is connected to the strap shaft, characterized in that: one end of the strap shaft extends out of the base, and a coil spring assembly is provided at the extended end of the strap shaft, the coil spring assembly includes a coil spring, a coil spring box and a sealing cover, the coil spring box and the sealing cover are fixed on the side wall of the main unit, the coil spring box and the sealing cover form an installation cavity, the extended end of the strap shaft extends into the installation cavity, and the coil spring is disposed in the installation cavity and connected to the strap shaft.

[0007] As a preferred embodiment, the inner side of the coil spring box is an open side, and the sealing cover is installed on the open side and sealed to the coil spring box. The sealing cover has an inner hole, through which the coil spool passes and extends into the mounting cavity. This configuration ensures a sealed connection between the sealing cover and the coil spring box, effectively preventing rainwater from entering the mounting cavity and causing the coil spring to rust or corrode.

[0008] To further prevent rainwater from quickly entering the spring box, the outer ring of the side of the sealing cover that mates with the spring box is provided with a flange, and the spring box is located inside the flange.

[0009] To prevent rainwater from seeping in through the gap between the spring box and the sealing cover, a sealing gasket is provided on the inner side of the flange, and the outer ring of the spring box presses against the sealing gasket.

[0010] To further prevent rainwater from seeping in through the gap between the spring box and the sealing cover, the outer end face of the spring box is provided with circumferential ribs, which press the sealing gasket tightly.

[0011] To prevent rainwater from seeping into the coiled spring box through the gap between the sealing cover and the side wall of the main unit, the sealing cover has a first sealing groove on the side facing the main unit, and a first sealing ring is installed in the first sealing groove. The sealing cover is sealed to the side wall of the main unit through the first sealing ring.

[0012] To further prevent rainwater from seeping into the spring box along the tape reel, a second sealing groove is provided at the protruding end of the tape reel corresponding to the position of the inner hole of the sealing cover. A second sealing ring is installed in the second sealing groove, and the tape reel is sealed to the sealing cover through the second sealing ring.

[0013] As another preferred embodiment, the outer side of the coil spring box is an open side, the sealing cover is installed on the open side and is sealed to the coil spring box through a sealing gasket, the inner wall of the coil spring box has an inner hole, and the winding shaft passes through the inner hole of the coil spring box and extends into the mounting cavity.

[0014] The coil spring can have various mounting structures. Preferably, the extended end of the winding shaft has an inner hook groove for connecting the inner hook of the coil spring, and the coil spring box has an outer hook groove for connecting the outer hook of the coil spring.

[0015] As a preferred embodiment of any of the above solutions, the coil spring box and the sealing cover are connected to each other by a detachable structure, and the connected coil spring box and sealing cover are fixed to the side wall of the main unit.

[0016] Further optimized, the spring coil box and the sealing cover can be detachably connected via a snap-fit ​​or slot-fit structure. The snap-fit ​​can be located on the spring coil box and the slot on the sealing cover, or vice versa, or other connection structures can be used. After connection, the spring coil box and sealing cover can be fixed to the side wall of the base using rivets, screws, or other connectors. If the handle is located on the outside of the base, it can be fixed to the side wall of the handle.

[0017] To fix the coil spring box and the sealing cover to the base, the outer periphery of the coil spring box is provided with a first lug and a first mounting hole. The outer periphery of the sealing cover is provided with a second lug and a second mounting hole corresponding to the first mounting hole. The base is provided with a third mounting hole corresponding to the first mounting hole and the second mounting hole. The connector is fixed in the third mounting hole after being connected to the first mounting hole and the second mounting hole.

[0018] To prevent the tape reel from detaching from the base, a tape reel mounting hole is provided on the base for the tape reel to pass through. A bushing is installed in the tape reel mounting hole and is fitted onto the tape reel. A retaining spring groove is provided at the extended end of the tape reel, and a retaining spring is installed in the retaining spring groove. The retaining spring is located on the outside of the bushing and between it and the spring assembly.

[0019] Compared with the prior art, the advantages of this utility model are as follows: the coil spring assembly of the automatic retractable car safety tensioning device is located at the extended end of the retractor shaft and fixed on the side wall of the main unit. The coil spring is located in the mounting cavity formed by the coil spring box and the sealing cover and is installed on the retractor shaft. On the one hand, it can prevent rainwater from entering the coil spring box and corroding the coil spring, reducing the risk of the coil spring breaking due to corrosion and improving the service life of the product. On the other hand, it also reduces the risk of the coil spring accidentally popping out and injuring people during disassembly, making it safer to use. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the automobile safety tensioning device according to Embodiment 1 of this utility model;

[0021] Figure 2 for Figure 1 A partially exploded diagram of the vehicle safety restraint device shown.

[0022] Figure 3 for Figure 1 The diagram shows the assembly diagram of the coil spring assembly of the automotive safety tensioning device.

[0023] Figure 4 for Figure 1 A fully exploded diagram of the vehicle safety restraint device shown.

[0024] Figure 5 This is a cross-sectional view of the automotive safety tensioning device according to an embodiment of the present invention;

[0025] Figure 6 This is an exploded view of the coil spring assembly according to an embodiment of the present utility model;

[0026] Figure 7 This is a cross-sectional view of the coil spring assembly according to an embodiment of the present utility model;

[0027] Figure 8 This is a schematic diagram of the coil spring assembly according to Embodiment 2 of this utility model;

[0028] Figure 9 This is a cross-sectional view of the car safety tensioning device according to Embodiment 2 of this utility model;

[0029] Figure 10 This is a schematic diagram of the coil spring assembly according to Embodiment 3 of this utility model;

[0030] Figure 11 This is a cross-sectional view of the car safety tensioning device according to Embodiment 3 of this utility model;

[0031] Figure 12 This is a partially exploded schematic diagram of the car safety tensioning device according to Embodiment 4 of this utility model. Detailed Implementation

[0032] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0033] Example 1:

[0034] like Figures 1 to 4 As shown, the automatic retractable car safety tensioning device of this embodiment includes a main unit 1, a long strap 2, a short strap 3, and a coil spring assembly 4. The main unit 1 can adopt a conventional structure. The main unit 1 includes a seat assembly 11, a handle assembly 12, and a retractable strap assembly 13. The seat assembly 11 includes a seat 111. The front end of the seat 111 is provided with a stop plate 112, a stop plate spring 113, a support plate 114, and a protective cover 117. The rear end is provided with a pressure plate 115, a pressure plate spring 116, and a connecting shaft 118.

[0035] The handle assembly 12 includes a handle 121, on which a drive pawl 122 and a pawl spring 123 are mounted. The handle 121 is pivotally connected to the seat 111 and can rotate about the winding shaft 131. Rotating the handle 121 can change the action state of the stop plate 112 and the pressure plate 115 on the ratchet. The drive pawl 122 is rotatably connected to the handle 121.

[0036] The tape winding assembly 13 includes a tape winding shaft 131, a bushing 132, a tape winding reel 133, and a retaining ring 134. A tape winding shaft mounting hole 1111 is provided on the base 111 for the tape winding shaft 131 to pass through. The bushing 132 is installed in the tape winding shaft mounting hole 1111 and sleeved on the tape winding shaft 131. The tape winding shaft 131 passes through the bushing 132 and the tape winding reel 133. One end of the tape winding shaft 131 extends out of the base 111. A retaining ring groove 1311 is provided at the extended end of the tape winding shaft 131. The retaining ring 134 is engaged in the retaining ring groove 1311 to limit the tape winding shaft 131 and prevent the tape winding shaft 131 from detaching from the base 111.

[0037] The seat assembly 11, handle assembly 12, and tape winding assembly 13 are pivotally connected together via tape winding shaft 131. The tape winding reel 133 is a disc-shaped structure consisting of two ratchet wheels 1331 and a drum 1332, used to wind the webbing 21 of the long binding strap 2. The ratchet wheels 1331 are prevented from reversing by a stop plate 112, and their rotation speed is controlled by a pressure plate 115.

[0038] In this embodiment, the handle 121 is located inside the base 111, although it can also be located on the outside. The reel 133 is located inside the handle 121 and centered. The reel 131 rotates under the drive of the handle assembly 12. The cross-section of the reel 131 is irregular, which cooperates with the irregular hole on the ratchet 1331, so that the reel 133 can drive the reel 131 to rotate together, or in other words, the reel 131 can drive the reel 133 to rotate together.

[0039] The straps in this embodiment include a long strap 2 and a short strap 3, both of which have webbing 21 and hooks 22. The long strap 2 is mounted on a winding shaft 131 and can be wound onto a winding reel 133. The short strap 3 is mounted on a connecting shaft 118. Furthermore, this automatic retractable car safety tensioning device can have both the long strap 2 and the short strap 3, or it can have only the long strap 2.

[0040] The coil spring assembly 4 is installed on the outside of the base 111 and cooperates with the extended end of the winding shaft 131. The cooperation between the winding shaft 13 and the coil spring assembly 4 enables the tensioning device to have an automatic winding function. After use, the long strap 2 can be automatically wound back into the main unit 1 without manual operation, which is very convenient to use.

[0041] The above structure is the preferred structure. Of course, the structure of the host is not limited to this. Other similar conventional structures or modified structures can also be used.

[0042] like Figures 5 to 7 As shown, the coil spring assembly 4 in this embodiment includes a coil spring 41, a coil spring box 42, and a sealing cover 43. The coil spring box 42 and the sealing cover 43 are fixed to the side wall of the main unit, forming a mounting cavity 46, which is a relatively sealed space. A sealing cover inner hole 431 is opened in the center of the sealing cover 43. The winding shaft 131 passes through the sealing cover inner hole 431 and extends into the mounting cavity 46. The coil spring 41 is located in the mounting cavity and connected to the winding shaft 131. This prevents rainwater from directly flowing into the coil spring box 42 and corroding the coil spring 41, reducing the risk of the coil spring 41 breaking due to corrosion and extending its service life. When the handle 121 is located inside the base 111, the coil spring box 42 and the sealing cover 43 are fixed to the side wall of the base 111. When the handle 121 is located outside the handle 121, the coil spring box 42 and the sealing cover 43 are fixed to the side wall of the handle 121. There are many ways to fix it, such as using screws or rivets 119 for fixing.

[0043] In this embodiment, the coil spring box 42 and the sealing cover 43 are fixed to the base 111. Specifically, the outer periphery of the coil spring box 42 is provided with a first lug 424, and the first lug 424 has a first mounting hole 425. The outer periphery of the sealing cover 43 is provided with a second lug 434, and the second lug 434 has a second mounting hole 435 corresponding to the first mounting hole 425. The base 111 has a third mounting hole 1112, which is aligned with the first mounting hole 425 and the second mounting hole 435. During installation, screws or rivets or other connecting parts 119 can be used to sequentially connect the first mounting hole 425 and the second mounting hole 435 and then fix them into the third mounting hole 1112, thereby fixing the coil spring box 42 and the sealing cover 43 to the outside of the base 111.

[0044] In this embodiment, the inner side of the spring box 42 is the open side. The sealing cover 43 is installed on the open side and is sealed to the spring box 42. The sealing cover 43 eliminates the gap between the spring box 42 and the side wall of the main unit, which can prevent rainwater from directly entering the spring box 42.

[0045] The specific sealing structure of the sealing cover 43 and the spring box 42 is as follows: A flange 432 is provided on the outer ring of the side of the sealing cover 43 that mates with the spring box 42, and the spring box 42 is located inside the flange 432. Furthermore, a sealing gasket 44 is provided inside the flange 432. The sealing gasket 44 is typically made of an elastic material, such as rubber or silicone. A circumferential rib 421 is provided on the outer end face of the spring box 42. The circumferential rib 421 presses against the sealing gasket 44, allowing it to be more effectively pressed into the sealing gasket 44, resulting in better waterproofing. With the above-mentioned waterproof structure between the sealing cover 43 and the spring box 42, rainwater can be prevented from seeping in through the gap between the spring box 42 and the sealing cover 43.

[0046] like Figure 6 and Figure 7 As shown, in order to limit the installation structure of the spring box 42 and the sealing cover 43, in this embodiment, a groove 436 is formed on the inner wall of the flange 432, and a buckle 426 that cooperates with the groove 436 is protruding on the outer peripheral wall of the spring box 42. The positions of the groove 436 and the buckle 426 are corresponding, and the number is unlimited. After the buckle 426 and the groove 436 are assembled and connected, they are not easy to separate, which can prevent the spring 41 from accidentally popping out and injuring people during installation and disassembly, thus improving the safety of use. During installation, the spring box 42 is rotated. When the buckle 426 on the spring box 42 is engaged with the groove 436 of the sealing cover 43, the spring box 42 and the sealing cover 43 are assembled together. Alternatively, the groove can be set on the spring box 42, and the buckle can be set on the sealing cover 43 accordingly. The cooperation of the two can also achieve the limiting structure. Of course, in addition to the snap-fit ​​connection, the spring box 42 and the sealing cover 43 can also be connected by other detachable structures, such as using rivets or screws to fix the spring box 42 and the sealing cover 43 together.

[0047] In this embodiment, the sealing gasket or sealing ring can be made of different materials or shapes. For example, the most basic circular sealing ring can be a standard rubber O-ring, but other end face sealing rings, shaft sealing rings, hole sealing rings, lip sealing rings, or other special sealing rings can also be used.

[0048] In this embodiment, the extended end of the winding shaft 131 has an inner hook groove 1312, and the inner hook 411 of the coil spring is connected to the inner hook groove 1312. The coil spring box 42 is provided with an outer hook groove 423, and the outer hook 412 of the spring is connected to the outer hook groove 423. With the above structure, after the coil spring 41 stores energy, it can rotate to drive the winding shaft 131 to rotate, and the winding shaft 131 then drives the winding reel 133 to rotate, thereby winding the webbing 21 of the long binding strap 2 onto the winding reel 133.

[0049] Example 2:

[0050] like Figure 8 and Figure 9As shown, in this embodiment, the sealing cover 43 has a first sealing groove 433 on its side facing the main unit 1. A first sealing ring 45 is installed in the first sealing groove 433. The sealing cover 43 is sealed to the side wall of the main unit through the first sealing ring 45, preventing water from seeping into the inner hole 431 of the sealing cover from the small gap between the sealing cover 43 and the side wall of the base 111, and then entering the coil spring box 42 to corrode the coil spring 41. The remaining structure of this embodiment can be referred to Embodiment 1, and will not be repeated here.

[0051] Example 3:

[0052] like Figure 10 and Figure 11 As shown, in this embodiment, a second sealing groove 1313 is formed at the protruding end of the winding shaft 131 corresponding to the position of the inner hole 431 of the sealing cover. A second sealing ring 135 is installed in the second sealing groove 1313, and the winding shaft 131 is sealed to the sealing cover 43 through the second sealing ring 135. This further prevents rainwater from seeping into the spring box 42 along the winding shaft 131. The remaining structure of this embodiment can be referred to Embodiment 1, and will not be repeated here.

[0053] Example 4:

[0054] like Figure 12 As shown, in this embodiment, the outer side of the spring box 42 is the open side. The sealing cover 43 is installed on the open side and is sealed to the spring box 42 through the sealing gasket 44. The spring box 42 and the sealing cover 43 form an installation cavity (not shown in the figure). The inner wall of the spring box 42 has a spring box inner hole 422. The winding shaft 131 passes through the spring box inner hole 422 and extends into the installation cavity. The remaining structure of this embodiment can be referred to Embodiment 1, and will not be repeated here.

[0055] In the specification and claims of this utility model, terms indicating direction, such as "front," "rear," "upper," "lower," "left," "right," "side," "top," and "bottom," are used to describe various exemplary structural parts and elements of this utility model. However, the use of these terms is merely for the purpose of explanation and is based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this utility model can be arranged in different orientations, these terms indicating direction are for illustrative purposes only and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0056] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, various modifications or improvements can be made to the present utility model without departing from the principle of the present utility model. For example, the sealing cover can also be set inside the opening side of the spring box or a similar structure. In addition to the detachable connection method, the sealing cover and the spring box can also be connected in a non-detachable way, such as by gluing or ultrasonic welding, so that the spring box and the sealing cover are completely connected and cannot be detached. These are all considered to be within the protection scope of the present utility model.

Claims

1. An automatic retractable car safety tensioning device, comprising a main unit (1) and a strap, wherein the main unit (1) comprises a base assembly (11), a handle assembly (12), and a strap assembly (13), the base assembly (11) comprising a base (111), the strap assembly (13) comprising a strap shaft (131) mounted on the base (111) and rotatable under the drive of the handle assembly (12), and the strap being connected to the strap shaft (131), characterized in that: One end of the tape reel (131) extends out of the base (111). A coil spring assembly (4) is provided at the extended end of the tape reel (131). The coil spring assembly (4) includes a coil spring (41), a coil spring box (42), and a sealing cover (43). The coil spring box (42) and the sealing cover (43) are fixed on the side wall of the main unit. The coil spring box (42) and the sealing cover (43) form an installation cavity (46). The extended end of the tape reel (131) extends into the installation cavity (46). The coil spring (41) is located in the installation cavity and connected to the tape reel (131).

2. The automatic retraction vehicle safety tensioning device according to claim 1, characterized in that: The inner side of the coil spring box (42) is the open side. The sealing cover (43) is installed on the open side and is sealed to the coil spring box (42). The sealing cover (43) has a sealing cover inner hole (431). The winding shaft (131) passes through the sealing cover inner hole (431) and extends into the mounting cavity (46).

3. The automatic retraction vehicle safety tensioning device according to claim 2, characterized in that: The sealing cover (43) and the spring box (42) have a flange (432) on the outer side of their respective sides, and the spring box (42) is located on the inner side of the flange (432).

4. The automatic retraction vehicle safety tensioning device according to claim 3, characterized in that: A sealing gasket (44) is provided on the inner side of the flange (432), and the outer ring of the coil spring box (42) presses against the sealing gasket (44).

5. The automatic retraction vehicle safety tensioning device according to claim 4, characterized in that: The outer ring end face of the coil spring box (42) is provided with a circumferential rib (421), and the circumferential rib (421) presses against the sealing gasket (44).

6. The automatic retraction vehicle safety tensioning device according to claim 2, characterized in that: The sealing cover (43) has a first sealing groove (433) on the side facing the host (1), and a first sealing ring (45) is installed in the first sealing groove (433). The sealing cover (43) is sealed to the side wall of the host through the first sealing ring (45).

7. The automatic retraction vehicle safety tensioning device according to claim 2, characterized in that: The extended end of the tape reel (131) has a second sealing groove (1313) corresponding to the position of the inner hole (431) of the sealing cover. A second sealing ring (135) is installed in the second sealing groove (1313), and the tape reel is sealed to the sealing cover through the second sealing ring (135).

8. The automatic retraction vehicle safety tensioning device according to claim 1, characterized in that: The outer side of the coil spring box (42) is the open side. The sealing cover (43) is installed on the open side and is sealed to the coil spring box (42) through the sealing gasket (44). The inner wall of the coil spring box (42) has a coil spring box inner hole (422). The winding shaft (131) passes through the coil spring box inner hole (422) and extends into the mounting cavity (46).

9. The automatic retraction vehicle safety tensioning device according to any one of claims 1 to 8, characterized in that: The coil spring box (42) and the sealing cover (43) are connected to each other through a detachable structure, and the connected coil spring box (42) and the sealing cover (43) are fixed on the side wall of the main unit.

10. The automatic retraction vehicle safety tensioning device according to claim 9, characterized in that: The coil spring box (42) and the sealing cover (43) are detachably connected by snaps, screws or rivets.

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