Automatic take-up automotive safety tensioner with waterproofed coil spring housing

Abstract

An automatic take-up automobile safety tensioning device with waterproof spring box, the main machine comprises a seat body assembly, a handle assembly and a take-up assembly, the seat body assembly comprises a seat body, the take-up assembly comprises a main shaft rotating under the drive of the handle assembly, a band is connected to the main shaft, one end of the main shaft extends out of the seat body, a spring assembly is installed at the extending end of the main shaft, the spring assembly comprises a spring, a spring box, a sealing cover and a coupling, the spring box and the sealing cover are fixed on the seat body or the handle assembly, the spring box, the sealing cover and the coupling enclose a sealed cavity, the spring is installed in the sealed cavity, the first end of the coupling is connected with the main shaft and can rotate synchronously with the main shaft, and the second end of the coupling is connected to the spring. The spring box, the sealing cover and the coupling of the automatic take-up automobile safety tensioning device with waterproof spring box enclose a sealed cavity for accommodating the spring, thereby preventing rainwater from entering the spring box and corroding the spring, reducing the risk of the spring breaking after corrosion, and greatly improving the service life of the product.

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 springs in these devices are 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 main shaft. One end of the main 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 structure). The inner hook of the spring connects to the extended end of the main shaft. The spring box is usually fixed to the main unit with rivets or screws. Theoretically, its open end face should fit snugly against the side of the main unit, but in actual assembly, the contact surfaces are difficult to completely seal, 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 will be damaged, forming micro-crack sources, which will aggravate stress concentration and easily lead to breakage during use, ultimately causing the automatic retraction function to fail.

[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 with a waterproof spring box that can prevent water from entering the spring box, 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 car safety tensioning device with a waterproof spring box, comprising 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 main shaft mounted on the base and capable of rotating under the drive of the handle assembly, and the strap is connected to the main shaft, characterized in that: one end of the main shaft extends out of the base, and a spring assembly is installed at the extended end of the main shaft, the spring assembly includes a spring, a spring box, a sealing cover and a coupling, the spring box and the sealing cover are fixed on the base or fixed on the handle assembly, the spring box, the sealing cover and the coupling form a sealed cavity, the spring is installed in the sealed cavity, the first end of the coupling is connected to the main shaft and can rotate synchronously with the main shaft, and the second end of the coupling is connected to the spring.

[0007] In order to ensure that the sealing cover can seal both with the spring box and with the coupling, preferably, the inner side of the spring box is an open side, the sealing cover is installed on the open side and is sealed to the spring box, the sealing cover has an inner hole, and the coupling is installed in the inner hole of the sealing cover and is sealed to the sealing cover.

[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 water leakage, the outer end face of the coil spring box is provided with circumferential ribs, which press the sealing gasket tightly.

[0011] In order to provide a mutually engaging limiting structure between the sealing cap and the spring box, a limiting hole is provided on the inner wall of the flange, and a buckle that engages with the limiting hole is provided on the outer peripheral wall of the spring box.

[0012] 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, and the coupling is sealed to the coil spring box through a sealing ring.

[0013] The coupling can have various structures. Preferably, the coupling includes a coupling hole and a coiled spring shaft. The protruding end of the main shaft is installed in the coupling hole, and the main shaft rotates synchronously with the coupling. The coiled spring shaft has an inner hook groove in the middle for connecting the inner hook of the coiled spring. The main shaft and the coupling can use any non-standard fit to ensure that they can rotate synchronously.

[0014] The coupling and the sealing cover can have various sealing structures. Preferably, a sealing groove is formed on the outer peripheral wall of the coupling, and a sealing ring is installed in the sealing groove. The coupling is sealed to the sealing cover through the sealing ring. Alternatively, the sealing groove can be set on the inner wall of the inner hole of the sealing cover, and a sealing ring can be installed in the sealing groove, which can also achieve a sealed connection between the coupling and the sealing cover.

[0015] In order to connect the outer hook of the coil spring to the coil spring box, the coil spring box is provided with an outer hook groove, and the outer hook of the coil spring is connected to the outer hook groove.

[0016] To prevent the spindle from detaching from the housing, a spindle mounting hole is provided on the housing for the spindle to pass through. A bushing is installed in the spindle mounting hole and is fitted onto the spindle. A snap ring groove is provided at the protruding end of the spindle, and a snap ring is installed in the snap ring groove. The snap ring is located on the outside of the bushing and between it and the coupling.

[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] Compared with the prior art, the advantages of this utility model are as follows: the automatic retractable car safety tensioning device with waterproof spring box has a spring assembly installed at the extended end of the main shaft. The spring box and sealing cover of the spring assembly are fixed on the base. The spring box, sealing cover and coupling form a sealed cavity to accommodate the spring, thereby preventing rainwater from entering the spring box and corroding the spring, reducing the risk of the spring breaking due to corrosion, and greatly improving the product life. Attached Figure Description

[0019] Figure 1 This is a perspective view of the automobile safety tensioning device according to Embodiment 1 of this utility model;

[0020] Figure 2 for Figure 1 The diagram shows a partial exploded perspective view of the vehicle safety restraint device.

[0021] Figure 3 for Figure 1 The diagram shows the assembly diagram of the coil spring assembly of the automotive safety tensioning device.

[0022] Figure 4 for Figure 1 The diagram shows a fully disassembled three-dimensional representation of the vehicle safety restraint device.

[0023] Figure 5 This is a cross-sectional view of the car safety tensioning device according to Embodiment 1 of this utility model;

[0024] Figure 6 This is an exploded perspective view of the coil spring assembly of the automobile safety tensioning device according to Embodiment 1 of this utility model;

[0025] Figure 7 for Figure 6 The diagram shows another angle of the coil spring assembly.

[0026] Figure 8 This is a front view of the tape reel box according to Embodiment 1 of this utility model;

[0027] Figure 9 This is a radial sectional view of the coil spring assembly according to Embodiment 1 of this utility model;

[0028] Figure 10 This is an axial sectional view of the coil spring assembly according to Embodiment 1 of this utility model;

[0029] Figure 11 This is a partially exploded perspective view of the car safety tensioning device according to Embodiment 2 of this utility model. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0031] Example 1:

[0032] 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.

[0033] 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 main 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.

[0034] The tape winding assembly 13 includes a spindle 131, a bushing 132, a tape reel 133, and a retaining ring 134. A spindle mounting hole 1111 is formed on the base 111 for the spindle 131 to pass through. The bushing 132 is installed in the spindle mounting hole 1111 and sleeved on the spindle 131. The spindle 131 passes through the bushing 132 and the tape reel 133, with one end of the spindle 131 extending out of the base 111. A retaining ring groove 1311 is provided at the extended end of the spindle 131, and the retaining ring 134 is engaged in the retaining ring groove 1311 to limit the movement of the spindle 131. The base assembly 11, the handle assembly 12, and the tape winding assembly 13 are pivotally connected together via the spindle 131. The reel 133 is a disc-shaped device consisting of two ratchet wheels 1331 and a drum 1332, used to wind the webbing 21 of the long binding strap 2. The ratchet wheel 1331 is prevented from reversing by the stop plate 112 and its rotation speed is controlled by the pressure plate 115.

[0035] 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 spindle 131 rotates under the drive of the handle assembly 12. The cross-section of the spindle 131 is irregular, which cooperates with the irregular hole on the ratchet 1331, so that the reel 133 can drive the spindle 131 to rotate together, or in other words, the spindle 131 can drive the reel 133 to rotate together.

[0036] 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 the main shaft 131 and can be wound onto the reel 133. The short strap 3 is mounted on the 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.

[0037] The coil spring assembly 4 is installed on the outside of the base 111 and cooperates with the extended end of the main shaft 131. The cooperation between the winding belt assembly 13 and the coil spring assembly 4 enables this 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, making it very convenient to use.

[0038] 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.

[0039] like Figure 5As shown, the coil spring assembly 4 in this embodiment includes a coil spring 41, a coil spring box 42, a sealing cover 43, and a coupling 44. The coil spring box 42 and the sealing cover 43 are fixed on the base 111. The coil spring box 42, the sealing cover 43, and the coupling 44 form a sealed cavity 47. The coil spring 41 is installed in the sealed cavity 47, which can prevent 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. In addition, when the handle 121 is located outside the base 111, the coil spring box 42 and the sealing cover 43 are fixed to the side of the handle 121.

[0040] The installation structure of the spring coil box 42 and the sealing cover 43 is as follows: The outer periphery of the spring coil 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 in the third mounting hole 1112, thereby fixing the spring coil box 42 and the sealing cover 43 to the outside of the base 111.

[0041] like Figures 5 to 10As shown, 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 specific sealing structure is as follows: the outer ring of the side of the sealing cover 43 that mates with the spring box 42 is provided with a flange 432. The spring box 42 is located inside the flange 432. Furthermore, a sealing gasket 45 is provided inside the flange 432. The sealing gasket 45 is usually made of an elastic material, such as rubber or silicone. The outer end face of the spring box 42 is provided with a circumferential rib 421. The circumferential rib 421 presses the sealing gasket 45 tightly. The circumferential rib 421 can be pressed more effectively into the sealing gasket 45, resulting in better waterproofing. After adopting the above-mentioned waterproof structure between the sealing cover 43 and the spring box 42, rainwater can be prevented from seeping in from the gap between the spring box 42 and the sealing cover 43. In addition, to limit the installation structure of the spring box 42 and the sealing cover 43, in this embodiment, a limiting hole 433 is opened on the inner wall of the flange 432, and a buckle 422 that cooperates with the limiting hole 433 is provided on the outer peripheral wall of the spring box 42. During installation, the spring box 42 is rotated, and when the buckle 422 on the spring box 42 engages with the limiting hole 433 of the sealing cover 43, the spring box 42 and the sealing cover 43 are assembled together. Alternatively, the limiting hole can be set on the spring box 42, and the buckle can be set on the sealing cover 43 accordingly. The two can cooperate to achieve the limiting structure. Of course, in addition to the buckle connection, other fixing methods can be used between the spring box 42 and the sealing cover 43, such as using rivets or screws to fix the spring box 42 and the sealing cover 43 together.

[0042] The sealing cover 43 has an inner hole 431, and the coupling 44 is installed inside the inner hole 431 and sealed to the sealing cover 43. The specific sealing structure is as follows: a sealing groove 443 is formed on the outer peripheral wall of the coupling 44, and a sealing ring 46 is installed inside the sealing groove 443. The coupling 44 is sealed to the sealing cover 43 through the sealing ring 46. This prevents further rainwater infiltration. Alternatively, the sealing groove can be located on the inner wall of the inner hole 431 of the sealing cover, and a sealing ring can be installed inside the groove, achieving the same sealed connection between the sealing cover 43 and the coupling 44.

[0043] 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.

[0044] One end of the coupling 44 has a coupling hole 441, and the other end has a coil spring shaft 442. The protruding end of the main shaft 131 is installed in the coupling hole 441. The coupling hole 441 is an irregularly shaped hole that matches the shape of the protruding end of the main shaft 131, allowing the coupling 44 to rotate synchronously with the main shaft 131. A retaining ring 134 is located between the outer side of the bushing 132 and the coupling 44 to prevent the main shaft 131 from disengaging from the seat 111. Additionally, the coil spring shaft 442 has an inner hook groove 444 in the middle for connecting the inner hook 411 of the coil spring. Figure 7 and Figure 9 As shown, the coil spring box 42 is provided with an outer hook groove 423, and the outer hook 412 of the coil 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 coupling 44 to rotate, the coupling 44 drives the main shaft 131 to rotate, and the main shaft 131 drives the winding reel 133 to rotate, thereby winding the webbing 21 of the long binding strap 2 onto the winding reel 133.

[0045] Example 2:

[0046] like Figure 11 As shown, in this embodiment, the inner wall of the spring box 42 fits against the side of the main unit, and the outer side of the spring box 42 is the open side. The sealing cover 43 is installed on the open side and can be fixed to the spring box 42 by a buckle or screw, and is sealed to the spring box 42 by a sealing gasket 45. The spring box 42 has an inner hole for installing the coupling 44. The coupling 44 can be sealed to the spring box 42 by a sealing ring 46. The sealing groove for installing the sealing ring 46 can be set on the outer peripheral wall of the coupling or on the inner wall of the spring box 42. Alternatively, the sealing ring 46 can be omitted.

[0047] 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.

[0048] 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, and these are all considered to be within the protection scope of the present utility model.

Claims

1. An automatic retractable car safety tensioning device with a waterproof coil spring box, 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 main shaft (131) mounted on the base (111) and rotatable under the drive of the handle assembly (12), and the strap being connected to the main shaft (131), characterized in that: One end of the main shaft (131) extends out of the base (111). A coil spring assembly (4) is installed at the extended end of the main shaft (131). The coil spring assembly (4) includes a coil spring (41), a coil spring box (42), a sealing cover (43), and a coupling (44). The coil spring box (42) and the sealing cover (43) are fixed on the base (111) or fixed on the handle assembly (12). The coil spring box (42), the sealing cover (43), and the coupling (44) form a sealed cavity (47). The coil spring (41) is installed in the sealed cavity (47). The first end of the coupling (44) is connected to the main shaft (131) and can rotate synchronously with the main shaft (131). The second end of the coupling (44) is connected to the coil spring (41).

2. The automatic retractable car safety tensioning device with a waterproof spring box according to claim 1, characterized in that: The inner side of the coil spring box (42) is an 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 an inner hole (431). The coupling (44) is installed in the inner hole (431) and is sealed to the sealing cover (43).

3. The automatic retractable car safety tensioning device with a waterproof spring box 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 retractable car safety tensioning device with a waterproof spring box according to claim 3, characterized in that: A sealing gasket (45) 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 (45).

5. The automatic retractable car safety tensioning device with a waterproof spring box 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 the sealing gasket (45).

6. The automatic retractable car safety tensioning device with a waterproof spring box according to claim 3, characterized in that: The flange (432) has a limiting hole (433) on its inner wall, and the outer peripheral wall of the spring box (42) is provided with a buckle (422) that cooperates with the limiting hole (433).

7. The automatic retractable car safety tensioning device with a waterproof spring box 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 (45). The coupling (44) is sealed to the coil spring box (42) through the sealing ring (46).

8. The automatic retractable car safety tensioning device with a waterproof spring box according to claim 1, characterized in that: The coupling (44) includes a coupling hole (441) and a coil spring shaft (442). The protruding end of the main shaft (131) is installed in the coupling hole (441), and the main shaft (131) rotates synchronously with the coupling (44). The coil spring shaft (442) has an inner hook groove (444) in the middle for connecting the inner hook (411) of the coil spring.

9. The automatic retractable car safety tensioning device with a waterproof spring box according to claim 1, characterized in that: A sealing groove (443) is provided on the outer peripheral wall of the coupling (44), and a sealing ring (46) is installed in the sealing groove (443). The coupling (44) is sealed to the sealing cover (43) through the sealing ring (46).

10. The automatic retractable car safety tensioning device with a waterproof spring box according to any one of claims 1 to 9, characterized in that: 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 seat (111) has a third mounting hole (1112) corresponding to the first mounting hole (425) and the second mounting hole (435). The connector (119) is connected to the first mounting hole (425) and the second mounting hole (435) in sequence and fixed in the third mounting hole (1112).

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