An automatic safety seatbelt device for motor vehicles
The enclosed coil spring assembly with sealing mechanisms addresses water ingress and corrosion issues, enhancing safety and durability in automatic seatbelt devices.
Patent Information
- Authority / Receiving Office
- DE · DE
- Patent Type
- Utility models
- Current Assignee / Owner
- Filing Date
- 2025-12-15
- Publication Date
- 2026-04-09
AI Technical Summary
Existing automatic seatbelt devices for vehicles face issues with water ingress into the coil spring housing, leading to corrosion and a risk of the coil spring snapping out, posing safety hazards during installation or removal.
The device incorporates a coil spring assembly enclosed by a coil spring housing and a sealing cap, with multiple sealing mechanisms to prevent water ingress, including sealing grooves, rings, and flanges, ensuring a tight connection to the main unit.
Prevents corrosion of the coil spring, reduces the risk of accidental release, and enhances safety by maintaining the integrity of the coil spring, thereby extending its service life and ensuring safe operation.
Smart Images
Figure 00000000_0000_ABST
Abstract
Description
TECHNICAL AREA
[0001] The present utility model relates to an automatic seatbelt device for motor vehicles, trailers, aircraft, ships and other means of transport for securing and fastening cargo, in particular an automatic safe seatbelt device for motor vehicles. STATE OF THE ART
[0002] A secure restraint system for motor vehicles typically consists of the main unit of the tensioner and long and short straps. These straps are usually flat woven webbing, with or without hooks. The main unit utilizes a reverse-locking ratchet mechanism. Turning the handle directly moves the drive pawl, which in turn drives the ratchet. The ratchet directly drives the main rotating shaft, thus tightening the strap wound onto it. The stop plate prevents the ratchet from turning backward, maintaining tension in the straps and ensuring the load is securely fastened. Depending on the application, the working length of the device varies, resulting in excess strap always hanging off the device.This poses a certain safety risk and leads to mess after use, which can impair subsequent use.
[0003] Currently, there are technical devices for automatic strapping winding and tensioning that, through the use of a ratchet-type strapping winding disc and a coil spring for energy storage, enable automatic winding of the strapping band and thus solve the aforementioned problems. The coil springs in these types of products are typically made of spring steel and housed in an open coil spring casing. The outer hook of the coil spring is attached to the cylindrical side wall of the coil spring casing, while the inner hook is centered and connected to the winding shaft. One end of the winding shaft protrudes outside the main unit of the strapping device, and the open side of the coil spring casing rests tightly against the outer surface of the main unit (this could be the outer surface of the handle or the seat body of the main unit, depending on the main unit's design).The inner hook of the coil spring is connected to the protruding end of the winding shaft. The coil spring housing is typically attached to the main unit using rivets or screws. Theoretically, the face of its opening should be flush with the side of the main unit; however, in practical assembly, it is difficult to ensure a completely tight seal between the contact surfaces, resulting in gaps. Since the safety restraint device for motor vehicles is frequently used outdoors, rainwater or meltwater can penetrate the coil spring housing through these gaps during rain or snow, leading to corrosion of the coil spring. Once the coil spring has corroded, its material structure, mechanical properties, and stress state are compromised, creating microscopic crack sources that further increase stress concentration.This easily leads to breakage during use and eventually to the failure of the automatic rewind function. Furthermore, this open design of the coil spring housing poses a risk of the coil spring popping out during assembly, installation, or maintenance. The sharp edges of the coil spring can injure the operator's skin or even damage vital facial organs, representing a significant safety hazard.
[0004] In summary, there is still room for improvement in existing safe seat belt devices with coil springs for motor vehicles. CONTENTS OF THE PRESENT USE SAMPLE
[0005] The technical problem to be solved by the present utility model is to provide, taking into account the above-mentioned prior art, an automatic safe seatbelt device for motor vehicles which prevents the ingress of water into the coil spring housing and reduces the risk of injury from the coil spring spring snapping out during installation or removal.
[0006] The technical solution for overcoming the aforementioned technical problems is an automatic, safe restraint device for motor vehicles, comprising a main unit and straps, wherein the main unit comprises a seat body assembly, a handle assembly, and a retractor assembly, wherein the seat body assembly comprises a seat body, wherein the retractor assembly comprises a retractor shaft mounted on the seat body, which is rotatable under the drive of the handle assembly, wherein the strap is attached to the retractor shaft, characterized in that one end of the retractor shaft projects from the seat body, wherein a coil spring assembly is attached to the projecting end of the coil spring shaft, wherein the coil spring assembly comprises a coil spring, a coil spring housing, and a sealing cap, wherein the coil spring housing and the sealing cap are attached to the side wall of the main unit, wherein the coil spring housing and the sealing cap together enclose a mounting chamber.wherein the protruding end of the winding shaft extends into the assembly chamber, wherein the coil spring is arranged within the assembly chamber and mounted on the winding shaft.
[0007] Preferably, the inside of the coil spring housing is the opening side, with the sealing cap mounted on the opening side and tightly connected to the coil spring housing. The sealing cap has an inner bore, and the winding shaft passes through this inner bore and projects into the assembly chamber. With this arrangement, the sealing cap is tightly connected to the coil spring housing, effectively preventing rainwater from entering the assembly chamber and thus preventing the coil spring from rusting or corroding.
[0008] To further prevent the rapid ingress of rainwater into the coil spring housing, the sealing cap has a flange on the outer circumference of the side surface cooperating with the coil spring housing, with the coil spring housing being arranged on the inside of the flange.
[0009] To prevent rainwater from penetrating through the joints between the coil spring housing and the sealing cap, a sealing pad is attached to the inside of the flange, with the outer ring of the coil spring housing pressing the sealing pad against it.
[0010] To further prevent rainwater from penetrating through the joints between the coil spring housing and the sealing cap, the end face of the outer circumference of the coil spring housing is provided with a circumferential rib, whereby the circumferential rib presses the sealing surface against it.
[0011] To prevent rainwater from penetrating the coil spring housing through the joints between the sealing cap and the side wall of the main unit, the sealing cap has a first sealing groove on the side facing the main unit, wherein a first sealing ring is installed in the first sealing groove, and the sealing cap is hermetically connected to the side wall of the main unit by the first sealing ring.
[0012] To further prevent rainwater from penetrating along the winding shaft into the coil spring housing, a second sealing groove is provided at the protruding end of the winding shaft, corresponding to the position of the inner bore of the sealing cap, wherein a second sealing ring is installed in the second sealing groove, and the winding shaft is tightly connected to the sealing cap by the second sealing ring.
[0013] Preferably, the outer side of the coil spring housing is the opening side, with the sealing cap mounted on the opening side and tightly connected to the coil spring housing by a sealing washer. The inner wall of the coil spring housing has an inner bore, and the winding shaft passes through this inner bore and projects into the assembly chamber. The coil spring can have various mounting configurations; preferably, the projecting end of the winding shaft has an inner hook groove for connecting to the inner hook of the coil spring, and the coil spring housing is provided with an outer hook groove for connecting to the outer hook of the coil spring.
[0014] Preferably, the rolling spring housing and the sealing cap are connected to each other by a detachable connection, wherein the rolling spring housing and the sealing cap are attached to the side wall of the main device after the connection.
[0015] Preferably, the coil spring housing can be detachably connected to the sealing cap by a cooperative structure consisting of a buckle and a clamping slot – either the buckle is located on the coil spring housing and the clamping slot on the sealing cap, or the buckle is located on the sealing cap and the clamping slot on the coil spring housing, or other connection structures besides the buckle and clamping slot can be used. The connected coil spring housing and the sealing cap can be fastened to the side wall of the seat body using fasteners such as rivets, screws, etc.; if the handle is located on the outside of the seat body, they are fastened to the side wall of the handle.
[0016] To secure the coil spring housing and the sealing cap to the seat body, a first projection is provided on the outer circumference of the coil spring housing, with a first mounting hole on this projection. A second projection is provided on the outer circumference of the sealing cap, with a second mounting hole on this projection that corresponds to the first mounting hole. A third mounting hole is provided in the seat body, aligned with the first and second mounting holes. The fasteners first pass through the first mounting hole and then the second mounting hole, and are then secured in the third mounting hole.
[0017] To prevent the winding shaft from falling out of the seat body, a winding shaft mounting hole is provided in the seat body. A shaft bushing, which is fitted onto the winding shaft, is installed in this mounting hole. A clamping spring groove is formed at the protruding end of the winding shaft, in which a clamping spring is mounted. The clamping spring is positioned between the outer surface of the bushing and the coil spring assembly.
[0018] Compared to the prior art, the advantage of this utility model is as follows: The coil spring assembly of the automatic safety restraint device for motor vehicles is attached to the protruding end of the retractor shaft on the side wall of the main unit, with the coil spring being located in the mounting chamber, which is enclosed by the coil spring housing and the sealing cap, and / or on the retractor shaft. On the one hand, this prevents rainwater from penetrating the coil spring housing, which leads to corrosion of the coil spring, reduces the risk of coil spring breakage due to corrosion, and increases the product's service life. On the other hand, it also minimizes the risk of accidental coil spring release and associated injuries during removal, thus improving safety during use. BRIEF DESCRIPTION OF THE DRAWING Fig. Figure 1 shows a schematic structural representation of the safe seatbelt device for motor vehicles of embodiment 1 in the present utility model; Fig. 2 shows a partial exploded view of the Fig. 1. Safe seat belt device for motor vehicles shown; Fig. Figure 3 shows a schematic assembly diagram of the coil spring assembly of the in Fig. 1. Safe seat belt device for motor vehicles shown; Fig. Figure 4 shows a complete exploded view of the [unclear text]. Fig. 1. Safe seat belt device for motor vehicles shown; Fig. Figure 5 shows a sectional view of the safe seatbelt device for motor vehicles of the embodiment in the present utility model; Fig. Figure 6 shows an exploded view of the coil spring assembly of the embodiment in the present utility model; Fig. Figure 7 shows a sectional view of the coil spring assembly of the embodiment in the present utility model; Fig. Figure 8 shows a schematic assembly representation of the coil spring assembly of embodiment 2 in the present utility model; Fig. Figure 9 shows a sectional view of the safe seatbelt device for motor vehicles of embodiment 2 in the present utility model. Fig. Figure 10 shows a schematic assembly representation of the coil spring assembly of embodiment 3 in the present utility model; Fig. Figure 11 shows a sectional view of the safe seatbelt device for motor vehicles of embodiment 3 in the present utility model. Fig. Figure 12 shows a partial exploded view of the safe restraint device for motor vehicles of embodiment 4 in the present utility model. DETAILED DESCRIPTION
[0019] The utility model is further described below using specific examples of its implementation with reference to the attached drawings. Design 1:
[0020] As in Fig. In this embodiment, the automatic seatbelt restraint system for motor vehicles comprises a main unit 1, a long strap 2, a short strap 3, and a coil spring assembly 4. The main unit 1 can have a conventional structure, consisting of a seat body assembly 11, a handle assembly 12, and a retractor assembly 13. The seat body assembly 11 comprises a seat body 111, the front end of which is equipped 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.
[0021] The handle assembly 12 comprises the handle 121, on which a drive pawl 122 and a pawl spring 123 are mounted. The handle 121 is rotatably connected to the seat body 111 around the winding shaft 131, and by rotating the handle 121, the operating state of the stop plate 112 and the pressure plate 115 on the ratchet can be changed. The drive pawl 122 is rotatably attached to the handle 121.
[0022] The winding assembly 13 comprises a winding shaft 131, a shaft bushing 132, a winding pulley 133, and a clamping spring 134. A mounting bore for the winding shaft 1111 is provided in the seat body 111, through which the winding shaft 131 is guided. The shaft bushing 132 is installed in the mounting bore of the winding shaft 1111 and pushed onto the winding shaft 131. The winding shaft 131 runs through the shaft bushing 132 and the winding pulley 133. One end of the winding shaft 131 protrudes from the seat body 111. The protruding end of the winding shaft 131 is provided with a clamping spring groove 1311. The clamping spring 134 is secured in the clamping spring groove 1311 to fix the winding shaft 131 and prevent it from detaching from the seat body 111.
[0023] The seat assembly 11, the handle assembly 12, and the winding assembly 13 are rotatably connected to one another by the winding shaft 131. The winding disc 133 consists of two parts, the ratchet 1331 and the drum 1332, and is disc-shaped. It serves to wind the fabric strip 21 of the long strip 2. The ratchet 1331 is prevented from rotating backward by the stop plate 112, and its rotational speed is controlled by the pressure plate 115.
[0024] The handle 121 of this embodiment is located on the inside of the seat body 111, but can of course also be arranged on the outside. The winding disc 133 is located on the inside of the handle 121 and is positioned centrally. The winding shaft 131 rotates under the drive of the handle assembly 12. The cross-section of the winding shaft 131 is profiled and fits into the profiled bore on the ratchet 1331, allowing the winding disc 133 to rotate together with the winding shaft 131, or conversely, the winding shaft 131 to rotate the winding disc 133.
[0025] The belt in this embodiment comprises a long belt 2 and a short belt 3, both of which have a fabric belt 21. In this embodiment, both the long belt 2 and the short belt 3 are provided with a hook 22. The long belt 2 is mounted on the winding shaft 131 and can be wound onto the winding disc 133. The short belt 3 is mounted on the connecting shaft 118. Furthermore, this automatic seatbelt restraint system for motor vehicles can have both a long belt 2 and a short belt 3, or only the long belt 2.
[0026] The coil spring assembly 4 is mounted on the outside of the seat body 111 and fits the protruding end of the retraction shaft 131. The retraction assembly 13 works together with the coil spring assembly 4, so that this restraint device has an automatic retraction function. After use, the long strap 2 can be automatically retracted into the main unit 1 without the need for manual operation, making it extremely convenient to use.
[0027] The structure mentioned above represents the preferred design; of course, the structure of the main device is not limited to it, but other similar conventional or modified structures may also be used.
[0028] As in Fig. 5-7 The coil spring assembly 4 of this embodiment comprises the coil spring 41, the coil spring housing 42, and the sealing cap 43. The coil spring housing 42 and the sealing cap 43 are attached to the side wall of the main unit. The coil spring housing 42 and the sealing cap 43 together enclose the mounting chamber 46, which is a relatively enclosed space. The sealing cap 43 has an inner bore 431 in its center, and the winding shaft 131 passes through this bore and projects into the mounting chamber 46. The coil spring 41 is located in the mounting chamber and connected to the winding shaft 431. This prevents rainwater from directly entering the coil spring housing 42 and corroding the coil spring 41, thereby reducing the risk of the coil spring 41 breaking due to corrosion and extending its service life.If the handle 121 is attached to the inside of the seat body 111, the coil spring housing 42 and the sealing cap 43 are attached to the side wall of the seat body 111. If the handle 121 is located on the outside of the handle 121, the coil spring housing 42 and the sealing cap 43 are attached to the side wall of the handle 121. There are also many fastening methods, such as the use of fasteners 119 like screws or rivets for fixing.
[0029] In this embodiment, the coil spring housing 42 and the sealing cap 43 are attached to the seat body 111. Specifically, a first projection 424 is provided on the outer circumference of the coil spring housing 42, with a first mounting bore 425 being provided on the first projection 424. A second projection 434 is provided on the outer circumference of the sealing cap 43, with a second mounting bore 435 being provided on the second projection 434, which corresponds to the first mounting bore 425. A third mounting bore 1112 is provided in the seat body 111, with the third mounting bore 1112 being aligned with the first mounting bore 425 and the second mounting bore 435.During assembly, the connecting elements 119, such as screws or rivets, can be used to first fasten the first mounting hole 425 and then the second mounting hole 435, and to insert these into the third mounting hole 1112, thereby fixing the roller spring housing 42 and the sealing cap 43 to the outside of the seat body 111.
[0030] The inner side of the coil spring housing 42 shown in this embodiment is the opening side. The sealing cap 43 is mounted on the opening side and tightly connected to the coil spring housing 42. The sealing cap 43 eliminates the gap between the coil spring housing 42 and the side wall of the main unit, thus preventing rainwater from directly entering the coil spring housing 42.
[0031] The specific sealing structure between the sealing cap 43 and the coil spring housing 42 is as follows: The sealing cap 43 has a flange 432 on the outer circumference of its side surface that interacts with the coil spring housing 42, with the coil spring housing 42 being located on the inside of the flange 432. A sealing pad 44 is also attached to the inside of the flange 432, and the sealing pad 44 is typically made of an elastic material such as rubber or silicone. The end face of the outer circumference of the coil spring housing 42 is provided with a circumferential rib 421, which presses against the sealing pad 44. The circumferential rib 421 can be pressed more effectively into the sealing pad 44, thereby improving the watertightness.After applying the above-mentioned waterproof construction between the sealing cap 43 and the rolling spring housing 42, the ingress of rainwater through the gap between the rolling spring housing 42 and the sealing cap 43 can be prevented.
[0032] As in Fig. 6 and Fig. 7 To limit the installation structure of the coil spring housing 42 and the sealing cap 43 in the present embodiment, a clamping slot 436 is provided on the inner wall of the flange 432. The outer circumferential wall of the coil spring housing 42 is convexly provided with a buckle 426 that fits into the clamping slot 436. The position of the clamping slot 436 and the buckle 426 coincides. The number of buckles 426 and buckles 436 is unlimited. After assembly and connection, the two cannot be easily separated. This prevents the coil spring 41 from accidentally popping out and injuring people during installation and removal, thus improving operational safety. During assembly, the coil spring housing 42 is rotated, and when the buckle 426 on the coil spring housing 42 engages in the clamping slot 436 of the sealing cap 43, the coil spring housing 42 and the sealing cap 43 are assembled together.Furthermore, the clamping groove can also be attached to the coil spring housing 42, with the buckle positioned accordingly on the sealing cap 43. The two fit together and can also form a limiting structure. Of course, in addition to the buckle connection between the coil spring housing 42 and the sealing cap 43, another detachable connection can be used; for example, rivets or screws can be used to firmly connect the coil spring housing 42 and the sealing cap 43.
[0033] The sealing washers or sealing rings used in this embodiment can be made of different materials or have different shapes. For example, the round sealing ring is usually a standard rubber O-ring. However, other flat sealing rings, shaft seals, bore seals, lip seals, or other special sealing rings can also be used.
[0034] In this embodiment, the protruding end of the winding shaft 131 is provided with an internal hook groove 1312, to which an internal hook of the coil spring 411 is attached. An external hook groove 423 is provided on the coil spring housing 42, to which an external hook of the spring 411 is connected. Following the application of the above-mentioned structure, the coil spring 411 can rotate after energy storage and drive the winding shaft 131. The winding shaft 131, in turn, drives the winding disc 133, thereby winding the long strip 2 with the fabric strip 21 onto the winding disc 133. Design 2:
[0035] As in Fig. A first sealing groove 433 is arranged on the side surface of the sealing cap 43 facing the main unit 1, as shown in Figures 8-9. A first sealing ring 45 is installed in the first sealing groove 433. The sealing cap 43 is tightly connected to the side wall of the main unit by the first sealing ring 45 to prevent water from penetrating the inner bore 431 of the sealing cap through the small gaps between the sealing cap 43 and the side wall of the seat body 111, and thus from entering the coil spring housing 42, where it could corrode the coil spring 41. The remaining structure of this embodiment can be carried out according to embodiment 1 and is not explained further here. Design 3:
[0036] As in Fig. At the protruding end of the winding shaft 131, corresponding to the position of the inner bore of the sealing cap 431, a second sealing groove 1313 is provided, wherein a second sealing ring 135 is installed in the second sealing groove 1313, the winding shaft 131 being tightly connected to the sealing cap 43 by the second sealing ring 135. This further prevents rainwater from penetrating the roller spring housing 42 along the winding shaft 131 of the winding belt. The remaining structure of this embodiment can be carried out according to embodiment 1 and is not explained further here. Design 4:
[0037] As in Fig.In Figure 12, the outer side of the coil spring housing 42 is the opening side, with the sealing cap 43 mounted on the opening side and tightly connected to the coil spring housing 42 by a sealing pad 44. The coil spring housing 42 and the sealing cap 43 enclose an assembly chamber (not shown in the figure). The inner wall of the coil spring housing 42 has an inner bore of the coil spring housing 422, and the winding shaft 131 passes through the inner bore of the coil spring housing 422 and projects into the assembly chamber. The remaining structure of this embodiment can be carried out according to embodiment 1 and is not explained further here.
[0038] In the description and claims of this utility model, direction-specific terms such as "front," "back," "top," "bottom," "left," "right," "side," "top," "bottom," etc., are used to describe the various exemplary structural parts and elements of this utility model. However, these terms are used here solely for explanatory purposes and are determined based on the exemplary orientations shown in the drawings. Since the disclosed embodiments of this utility model can be arranged in different directions, these direction-specific terms are to be understood merely as clarification and not as limitations—for example, "top" and "bottom" are not necessarily limited to a direction opposite to or corresponding with the direction of gravity.
[0039] The embodiments of the present utility model described above are merely preferred. It should be noted that those skilled in the art in this field may make various modifications or improvements, provided they do not depart from the fundamental principles of this utility model. For example, the sealing cap may also be attached to the inside of the opening side of the coil spring housing or to a similar structure. Furthermore, the connection between the sealing cap and the coil spring housing may be made not only as a detachable connection but also as a permanent connection, for example by gluing, ultrasonic welding, etc., so that the coil spring housing and the sealing cap are completely and permanently joined. All these variants fall within the scope of protection of this utility model.