INDICATOR DEVICE, SAFETY BELT DEVICE AND CHILD SAFETY TRANSPORTER

Abstract

Display device (10) configured to indicate the status of a seat belt (20) with adjustable length, wherein the display device (10) comprises a housing (11, 12, 101), a display element arranged in the housing (11, 12, 101) and a sliding element (13) for transporting the seat belt (20), wherein the sliding piece (13) is arranged in the housing (11, 12, 101) on a damped sliding rail, the display unit has first display information and second display information that are different from each other, and the safety belt (20) is tensioned to a certain degree to drive the sliding piece (13) so that it slides a specified distance against the damping, and then the display part is activated so that it switches from the first display information to the second display information, wherein the display device (10) further comprises a power source which is connected to the display part and the sliding piece (13), wherein: a mounting slot (102) is arranged in the housing (11, 12, 101), the display part is mounted in the mounting slot (102) and has a contact part (152) that protrudes from the mounting slot (102), the contact part (152) is connected to the power source, and the sliding piece (13) slides so that it contacts the contact part (152) to establish a connection between the electronic component (15) and the power source, so that the second display information can be sent.

Description

Field of expertise

[0001] The present invention relates to the field of child transport products and, more particularly, to a display device, a safety belt device and a child safety transporter. background

[0002] When a small child is in a child carrier, it is safer and more reliable to secure the child with a seat belt. However, existing seat belts do not have an indicator for tightness adjustment, meaning they are tightened and fixed in a fixed position each time, regardless of the user's body type. Therefore, the seat belt tends to fail to protect and safety a thin user due to excessively loose tension, while an overweight user often feels uncomfortable due to excessively tight tension.

[0003] It is therefore necessary to provide an indicator device arranged on the seat belt device for adjusting the seat belt to different positions according to children of different body types sitting in a child seat and for recognizing whether the seat belt has been tightened to a position suitable for the user by means of the indicator device which switches display information.

[0004] DE 20 2020 103 540 U1 discloses a strap adjustment device for adjusting the tension of a strap of a latch device. A display component is slidably mounted on the base and includes a display portion, wherein the display component is driven to slide to expose the display portion through a display window structure when the strap is tensioned or loosened.

[0005] EP 2 430 942 A1 discloses a buckle comprising a housing connected to a lower strap of the restraint system, a coupling mechanism arranged to releasably engage a pair of tongue-like coupling elements, each connected to a respective upper strap of the restraint system, and an indicator device for indicating the correct tension of the straps to the user. The indicator device comprises an indicator element with a visual symbol visible to the user through one or more openings provided in the housing and received in the housing such that it is movable between a corresponding first end position of movement in the loose strap state, in which the visual symbol is not visible to the user, and a second end position corresponding to the correctly tensioned strap state, in which the visual symbol is visible to the user.

[0006] US 2003 / 0155166 A1 discloses a tension sensing assembly for a seat restraint system in a vehicle. The tension sensing assembly comprises a housing for operative connection to a vehicle structure and at least one spring disposed within the housing. The tension sensing assembly also comprises at least one magnet disposed within the housing and a Hall-effect sensor disposed within the housing and operable to interact with the at least one magnet.

[0007] WO 2008 / 121148 A1 discloses a child restraint system for detecting and indicating whether a vehicle safety belt is sufficiently tensioned to secure a child seat on a vehicle seat and whether a child seat harness is sufficiently tensioned to restrain a child within the child seat. The child restraint system includes a safety belt tension sensor and a status indicator, as well as a belt tension sensor and a status indicator for the child seat. Summary

[0008] An object of the present invention is to provide a display device which has a simple structure and can smoothly switch display information.

[0009] Another object of the present invention is to provide a seat belt device. The seat belt device includes an indicator device that allows convenient detection of whether the seat belt device has been tightened to a suitable position.

[0010] Another object of the present invention is to provide a child safety carrier, wherein a seat belt device of the child safety carrier is provided with the aforementioned display device.

[0011] To achieve the above-mentioned objects, the present invention provides a display device configured to display a state of a length-adjustable seat belt. The display device includes a housing; a display member disposed in the housing; and a slider for transporting the seat belt. The slider is disposed in the housing on a damped slide rail, and the display member displays first and second display information that are different from each other. The seat belt is tensioned to a certain degree to drive the slider to slide a predetermined distance against the damper, and then the display member is activated to switch from the first display information to the second display information.

[0012] In contrast to the prior art, the indicator device provided by the present invention is arranged on the seat belt. After the seat belt is tightened to a certain degree to activate the slider of the indicator device to slide, the indicator device is activated to transmit corresponding display information. The seat belt can be pulled to different positions according to different types of children on the child safety carrier, and the display information of the indicator device on the seat belt is switched to indicate whether the seat belt has been tightened to a position suitable for the user.A slider for transporting the seat belt is arranged in the housing. The slider is arranged in the housing on a damped slide rail. The slider slides to a specific position and activates the indicator, switching from the first display information to the second display information, thereby indicating whether the seat belt has been tightened to a suitable position. The present invention has a simple structure, is convenient to operate, is very practical, and is suitable for wide application and use.

[0013] The first display information is preferably a first color provided by the housing. When the display part is not activated by the slider, the housing provides the first color. The structure is simple, and identification is easy.

[0014] The second display information is preferably a second color provided by the housing and different from the first color. When the display part is activated by the slider, the housing can provide a different color that is different from the first color. The structure is simple, and identification is easy.

[0015] The slider preferably has a structure with the second color. The second display information is color information provided by a cooperation between the slider and the housing, i.e., a color of the slider is the second display information. Therefore, the structure is simple and the design is reasonable.

[0016] The housing is preferably provided with a display opening for displaying the first or second color, and the seat belt is tensioned to a certain extent to push the slider against the damper toward the display opening to switch the display opening from the first display information to the second display information. The slider is pushed toward the display opening against the damper with a force for pulling the seat belt, and when the color displayed in the display opening changes from an original color to the color of the slider, it means that the seat belt has been tensioned to the correct position. Therefore, the structure is simple and the design is reasonable.

[0017] The display device preferably further comprises a spring element arranged on the slider and positioned in the housing, the spring element damping the sliding of the slider and returning the slider to the original position. A spring element with a certain spring force is arranged on the slider. When the slider is pulled by the seat belt to slide, the spring element can dampen the sliding of the slider to a certain extent, and when the seat belt is released, the spring element can drive the slider to return it to the original position. Therefore, the structure is simple and the design is rational.

[0018] The spring element preferably has a coil spring structure. The coil spring can dampen the sliding of the slider and can store spring potential energy. After the seat belt resistance is removed, the spring potential energy can drive the coil spring to return the slider to its original position.

[0019] The slider preferably includes a mounting portion for supporting the seat belt and a limiting portion for preventing the seat belt from slipping out of the slider. The seat belt can be securely positioned on the slider through the cooperation of the mounting portion and the limiting portion, and the structure is simple and the design is efficient.

[0020] Preferably, a first and a second limit block are arranged in the housing, and the slider is slidably arranged between the first and second limit blocks. The slider and the spring element are arranged between the first and second limit blocks, and the slider and the spring element slide between the first and second limit blocks due to the action of the seat belt, so that the structure is compact and practical.

[0021] Preferably, the display part is an electronic component capable of transmitting audible and / or visual information, and the display part is pressed by the sliding of the slider to switch from the first display information to the second display information. The slider slides to activate the display part, so that the display part is turned on as the electronic component, thereby switching from the first display information to the second display information. Therefore, the structure is simple and the design is rational.

[0022] Preferably, the first display information is silent information, and the second display information is audible and / or visual information. When the display part is not activated by the slider, the display part is in a silent state, and upon activation, the display part transmits the audible information or the visual information, or both. Therefore, the operation is convenient, and the effect is obvious.

[0023] Preferably, the first display information is acoustic and / or visual information, and the second display information is acoustic and / or visual information that is different from the first display information. When the display part is not activated by the slider, the display part transmits the first acoustic and / or visual information, and after being activated, the display part transmits the second acoustic and / or visual information. Therefore, the operation is convenient and the design is rational.

[0024] The display device further includes a power source connected to the display part and the slider. A mounting slot is arranged in the housing, and the display part is mounted in the mounting slot and has a contact part protruding from the mounting slot. The contact part is connected to the power source, and the slider slides to contact the contact part to realize connection between the electronic component and the power source, so that the second display information can be transmitted. The power source is arranged in the housing or on the seat belt and is connected to the contact part and the slider. When the slider slides to contact the contact part, the power source is connected to the electronic component. Therefore, the structure is simple and the design is rational.

[0025] To achieve the above further objective, the present invention provides a seatbelt device comprising a seatbelt and the aforementioned display device. The display device is arranged on the seatbelt and connected thereto.

[0026] Unlike the prior art, the indicator device is arranged on and connected to the seat belt. After the seat belt is tightened to a certain degree to activate the slider of the indicator device to slide, the indicator device is activated to transmit corresponding display information. The seat belt can be pulled to different positions according to different types of children on the child safety carrier, and the display information of the indicator device on the seat belt is switched to indicate whether the seat belt has been tightened to a position suitable for the user. Therefore, the structure is simple and the implementation is easy.

[0027] To achieve the further objective, the present invention provides a child safety carrier comprising a carrier body for carrying a child and the aforementioned seat belt device. The seat belt of the seat belt device is connected to the carrier body.

[0028] Unlike the prior art, the carrier is equipped with a seat belt device, and the seat belt device is connected to the indicator device. After the seat belt is tightened to a certain degree to activate the slider of the indicator device to slide, the indicator device sends corresponding display information. The seat belt can be pulled to different positions according to different types of children on the carrier, and the display information of the indicator device on the seat belt is switched to indicate whether the seat belt has been tightened to a position suitable for the user. Therefore, it is convenient to use, and it is safer and more reliable.

[0029] Preferably, the transporter body is a structure of a safety seat, stroller, cradle, or rocker. The display device is suitable for transporters of various structures and is convenient to use and can be widely used. Short description of the drawings Fig. 1 is a schematic structural diagram of a safety seat according to an embodiment of the present invention. Fig. 2 is a schematic structural diagram of a safety seat according to another embodiment of the present invention. Fig. 3 is a schematic construction diagram of a Fig. 1 shown display device. Fig. 4 is a schematic construction diagram of an internal structure of the display device of Fig. 3 when displaying initial display information. Fig. 5 is a schematic construction diagram of a slider of Fig. 1. Fig. Fig. 6 is a schematic diagram of an internal structure of the display device of Fig. 3 when displaying a second display information. Fig. Fig. 7 is a schematic diagram of an internal structure of the display device of Fig. 6 after removing the seat belt. Fig. 8 is a schematic diagram of an internal structure of a first housing of Fig. 3. Fig. 9 is a sectional view of the seat belt of Fig. 2 when displaying the first display information. Fig. 10 is an enlarged view of A of Fig. 9. Fig. 11 is a sectional view of the seat belt of Fig. 2 when displaying the second display information. Fig. 12 is an enlarged view of B of Fig. 11. Fig. 13 is a schematic construction diagram of the slider of Fig. 2. List of reference numbers 100 child safety transporters 10 Display device 101 housings 102 Mounting slot 11 First housing 111 Display opening 112 First assembly block 1121 butt part 113 Second mounting block 114 First guide section 12 Second housing 121 First boundary block 122 Second boundary block 123 Second guide section 13 sliding piece 131 Assembly part 132 First boundary part 133 Second boundary part 134 Spring compression opening 14 Spring element 15 Electronic Component 151 Fastening part 152 Contact part 20 seat belt 30 transporter bodies Detailed description

[0030] Hereinafter, the present invention will be described in conjunction with the embodiments and the accompanying drawings to further explain the technical content and structural elements of the present invention.

[0031] In the Fig. 1 and Fig. 2, the present invention provides a child safety carrier 100 comprising a carrier body 30 for carrying a child or infant, and a safety belt device connected to the carrier body 30. An indicator device 10 is disposed on the safety belt device and connected to a safety belt 20. The indicator device 10 is configured to indicate a state of the adjustable-length safety belt 20.

[0032] The display device 10 includes a housing 101, a display part disposed in the housing 101, and a slider 13 for transporting the seat belt 20. Specifically, the slider 13 is disposed in the housing 101 on a damped slide rail, and the display part displays first display information and second display information different from the first display information. The seat belt 20 is tensioned to a certain degree to allow the slider 13 to slide against the damper for a predetermined distance, and then the display part is activated to switch from first display part information to second display part information. It is understood that "a certain degree" refers to the extent to which the seat belt 20 is pulled to allow the slider 13 to slide against the damper.In addition, the “set distance” means a distance that the slider 13 slides from an initial position to a position at which the display part is activated.

[0033] When the above technical solution is used, the child safety carrier 100 provided by the present invention is provided with a seat belt device having a display device 10 so that it is convenient to know whether the seat belt 20 has been pulled to a position suitable for the user.

[0034] In particular, the indicator device 10 is arranged on and connected to the seat belt 20. After the seat belt 20 has been tensioned to a certain degree to activate the slider 13 of the indicator device 10, the indicator device 10 is activated and transmits corresponding display information. The seat belt 20 can be pulled to different positions according to different types of children on the child safety carrier 100, and the indicator device 10 on the seat belt 20 can be switched from the first display information to the second display information to indicate whether the seat belt 20 has been tensioned to a position suitable for the user.The slider 13, in which the seat belt 20 is transported, is arranged in the housing 101 on a damped slide rail. It slides to a certain position and activates the display part, switching the display part from the first display information to the second display information. That is, when the display part is not activated, it displays the first display information, and when activated, it displays the second display information, allowing it to be determined whether the seat belt 20 has been tightened to a suitable position. The present invention has a simple structure, is convenient to operate, and is very practical, suitable for wide application and use.

[0035] In the Fig. 1 and Fig. 2, in some embodiments, the carrier body 30 has a structure of a safety seat, stroller, crib, or rocker. The display device 10 of the present invention is suitable for child safety carriers 100 of various structures and carriers with various seat belt devices. The display device 10 of the present invention has a wide range of applications, is convenient to operate, and is very practical, suitable for widespread application and use.

[0036] In the Fig. 3 to 8, in some embodiments, the first display information is a first color provided by the housing 101. The first color may be a color such as red, blue, yellow, or the like, or a combination thereof. When the display part is not activated by the slider 13, the housing 101 provides the first color of one of the aforementioned colors. The color provided by the housing 101 may be a color of the housing 101 itself or a color of one of the other corresponding components in the housing 101, which is not limited to the present invention.

[0037] In the Fig. 3 to 8, the second display information is a second color provided by the housing 101 and different from the first color. The second color may be a color such as red, blue, yellow, or the like, or a combination thereof. The second color may be different from the first color and may be clearly distinguishable from the first color, but the present invention is not limited thereto. In particular, when the display part is activated by the slider 13, the housing 101 may provide another color that is different from the first color. In one example, when the display part is not activated, the first color displayed by the display part is yellow, and when the display part is activated, the second color displayed by the display part is red.In another example, when the indicator part is not activated, the first color displayed by the indicator part is red, and when the indicator part is activated, the second color displayed by the indicator part is green. There may be a significant color difference between the first and second colors, but this is not described here.

[0038] In the embodiment shown in the Fig. 4 to 6, the slider 13 has a pattern in the second color. When the slider 13 is in the home position, the color displayed on the housing 101 is a color of the housing 101 or another corresponding component. When the seat belt 20 slides the slider 13 to a position where the housing 101 displays a color of a component, the color of the slider 13 is displayed with a second color pattern on the housing 101. It is understood that the second display information is color information provided by the cooperation of the slider 13 and the housing 101. That is, when the slider 13 slides until the housing 101 displays the color of the slider 13, the seat belt 20 has been tightened to the correct position, so the structure is simple and the design is reasonable.

[0039] In the Fig. 4 and Fig. 8, in some implementations of this embodiment, the housing 101 comprises a first housing 11 and a second housing 12, the first housing 11 and the second housing 12 cooperating to form the housing 101. The housing 11 is provided with a display opening 111 for displaying the first or second color. When the slider 13 is in a home position and not sliding, the display opening 111 displays a color of an internal component at a position corresponding to the display opening 111. When the seat belt 20 slides the slider 13 to the position corresponding to the display opening 111, the display opening 111 displays a color of the slider 13 with the second color pattern. Specifically, the seat belt 20 is tensioned to a certain extent to push the slider 13 against the damper toward the display opening 111, so that the color of the slider 13 can be displayed in the display opening 111.When the color displayed in the indicator hole 111 changes from the original color to the color of the slider 13, it means that the seat belt 20 has been pulled to the appropriate position. It should be understood that the indicator part is configured as the first housing 11 with the indicator hole 111. Therefore, the structure is simple and the design is reasonable.

[0040] In Fig. 5, in this embodiment, the slider 13 includes a mounting portion 131 for supporting the seat belt 20, as well as a first limiting portion 132 and a second limiting portion 133 for preventing the seat belt 20 from slipping out of the slider 13. The first limiting portion 132 is disposed at one end of the mounting portion 131, and the second limiting portion 133 is disposed at the other end of the mounting portion 131. One end of the seat belt 20 is a fixed end, which is sewn, for example, and through which the slider 13 passes. The slider 13 is arranged at the fixed end of the seat belt 20, and the mounting part 131 is in direct contact with the seat belt 20, so that by the cooperation of the mounting part 131 and the limiting parts arranged at its ends, the seat belt 20 can be securely provided on the slider 13 without slipping out of the slider 13.The seat belt 20 pushes the slider 13 in the housing 101 through the mounting part 131, so that the structure is simple and the design is reasonable.

[0041] In the Fig. 4 to 8, the second housing 12 is provided with a first limiting block 121 and a second limiting block 122, and the slider 13 is slidably disposed between the first limiting block 121 and the second limiting part 133. The first housing 11 is provided with a first mounting block 112 that cooperates with the first limiting block 121 and a second limiting block 113 that cooperates with the second limiting block 122. The first mounting block 112 and the second limiting block 113 cooperate with the first limiting block 121 and the second limiting block 122, respectively, and are screwed thereto. A surface of the first mounting block 112 that abuts the spring element 14 is provided with a straight abutting part 1121 to abut the spring element 14 and prevent the spring element 14 from slipping and impairing the overall effect.The seat belt 20 is mounted on the mounting part 131 to drive the slider and the spring element 14 to slide between the first limit block 121 and the second limit block 122. In order for the seat belt 20 to smoothly drive the slider 13 and extend from the housing 101, a first guide part 114 is arranged in the first housing 11, and a second guide part 123 is arranged in the second housing 12. The seat belt 20 is guided by the first guide part 114 and the second guide part 123 as it extends from the housing 101. Furthermore, the first guide part 114 and the second guide part 123 are arranged obliquely at a certain angle in the housing 101, and the seat belt 20 passes between the first guide part 114 and the second guide part 123.The first guide member 114 and the second guide member 123 are configured to reduce the tensile force of the seat belt 20 directly acting on the housing 101 for driving the slider 13, thereby protecting the housing 101 and extending its service life. Therefore, the structure is simple, the design is reasonable, and the effect is good.

[0042] In the Fig. 4 to 7, the display device 10 further includes the spring element 14 arranged on the slider 13 and positioned in the housing 101. The spring element 14 enables damping of the slider 13 and returns it to its sliding starting position. The spring element 14 has, for example, a structure with a coil spring. The coil spring can dampen the sliding of the slider 13 and store a certain spring potential energy. After resistance from the seat belt 20 is removed, the spring potential energy can drive the coil spring to return the slider 13 to the starting position. The slider 13 is provided with one or more spring compression holes 134. One end of the spring element 14 is arranged in the spring compression hole 134, and its other end abuts against the abutment part 1121 of the first housing 11. A spring element 14 with a certain spring force is arranged on the slider 13.When the slider 13 is pulled by the seat belt 20 to slide, the spring element 14 can provide a certain amount of damping against the sliding of the slider 13. When the slider 13 slides to a position where the indicator part is activated, the coil spring is compressed in the spring compression hole 134; and when the seat belt 20 is loosened, the stored spring potential energy of the coil spring can drive the slider 13 to return to its original position. Therefore, the structure is simple and the design is rational.

[0043] In the Fig. 2 and 9 to 13, in some embodiments, the display part is an electronic component 15 that can transmit acoustic and / or optical information. That is, the display part is an electronic component 15 that can transmit acoustic information, or an electronic component 15 that can transmit optical information, or an electronic component 15 that can transmit acoustic and optical information. By sliding the slider, the display part switches from the first display information to the second display information, and the slider 13 slides to activate the display part, so that the display part is turned on as the electronic component 15, so that it switches from the first display information to the second display information. Therefore, the structure is simple and the design is rational.

[0044] In the Fig. 9 to 13, in some implementations of this embodiment, the first display information is silent information. In this embodiment, silent information means that no acoustic and / or visual information is transmitted. On the other hand, the second display information is acoustic and / or visual information. It should be understood that when the display part is not activated by the slider 13, the display part is in a silent state. When the display part has been activated by the slider 13, the display part functions as the electronic component 15 and transmits the acoustic information or the visual information, or both. The acoustic information and the visual information can be arbitrarily set, but the present invention is not limited thereto. Therefore, the operation is convenient, the effect is obvious, and identification is easy.

[0045] In the Fig. 9 to 13, in other implementations of this embodiment, the first display information is audible and / or visual information, and the second display information is audible and / or visual information that is different from the first display information. It should be understood that when the display part is activated by the slider 13, the display part transmits a first audible information or a first visual information, or both. The audible information and the visual information transmitted by the electronic component 15 can be arbitrarily determined, but the present invention is not limited thereto.When the display part is activated by the slider 13, a second acoustic information different from the first acoustic information is transmitted, or a second optical information different from the first optical information is transmitted, or the second acoustic information and the second optical information different from one or both of the first acoustic information and the first optical information are simultaneously transmitted. That is, the display part of the present invention is actuated as long as the second display information can be distinguished from the first display information, but the present invention is not limited to this.

[0046] In the Fig. 9 to 13, the display device further includes a power source (not shown) connected to the display part and the slider 13. The power source can be arranged in the housing 101 or other locations outside the housing 101, as long as it can be electrically connected to the slider 13 and the electronic component 15. The mounting position in the present invention is not limited to the power source. Specifically, the housing 101 is provided with a mounting slot 102, and the display part includes a fixing part 151 mounted in the mounting slot 102 and a contact part 152 protruding from the mounting slot 102. The contact part 152 is connected to the power source, and the slider 13 slides to contact the contact part 152 to realize connection between the electronic component 15 and the power source, so that the second display information can be transmitted.For example, one pole of the power source is connected to the contact part 152, and the other pole of the power source is connected to the slider 13. When the slider 13 slides so that it is in contact with the contact part 152, the two poles of the power source are connected to each other, so that the electronic component 15 operates and switches from the first display information to the second display information. Alternatively, both poles of the power source are connected to the contact part 152 but not to each other. When the slider 13 slides so that it is in contact with the contact part 152, the poles of the power source at the contact part 152 are connected to each other through contact with the slider 13, so that the electronic component 15 is connected to the operating power source, and then the electronic component 15 switches from the first display information to the second display information.This provides a simple structure and a reasonable design, and the present invention is very practical and suitable for wide application.

[0047] In Fig. 13, the seat belt 20 is mounted in the mounting part 131 of the slider 13. An end surface of the first restriction part 132 near the mounting part 131 is curved. The seat belt 20 directly acts on the curved surface. The seat belt 20 drives the curved surface and thus drives the slider 13 to slide so that it is in contact with the electronic component 15. A surface of the first fastening part 132 in contact with the seat belt 20 has a curved surface structure that better fits the seat belt 20, thereby preventing wear of the seat belt 20, enabling smoother sliding, and providing a simple structure and rational design.

[0048] In contrast to the prior art, the child safety carrier 100 according to the present invention is provided with a seat belt device including a display device 10 connected to a seat belt 20; a slider 13 of the display device 10 can be activated to slide after the seat belt 20 has been tightened to a certain degree; and the display device 10 can be activated to transmit corresponding display information. The seat belt 20 can be pulled to different positions according to children with different body types, and the display device 10 on the seat belt 20 switches from the first display information to the second display information, thereby indicating whether the seat belt 20 has been tightened to a position suitable for the user.The first and second display information may each be a sound, light of different colors, or the like, as long as the first display information is different from the second display information and they can be clearly distinguished from each other. The display device 10 of the present invention has a simple structure and is convenient to use, making driving safer and more comfortable for the user. Therefore, it is very practical and suitable for wide application.

[0049] The above-disclosed embodiments are merely preferred examples of the present invention and should not be used to limit the scope of the present invention. Therefore, appropriate modifications made in accordance with the claims of the present invention are within the scope of the present invention.

Claims

[1] A display device (10) configured to display a state of a safety belt (20) with adjustable length, the display device (10) comprising a housing (11, 12, 101), a display part arranged in the housing (11, 12, 101) and a slider (13) for transporting the safety belt (20), the sliding piece (13) is arranged in the housing (11, 12, 101) on a damped slide rail, the display part has first display information and second display information which are different from each other, and the safety belt (20) is tensioned to a certain degree to drive the sliding piece (13) so that it slides a predetermined distance against the damping, and then activates the display part to switch from the first display information to the second display information, wherein the display device (10) further comprises a power source connected to the display part and the slider (13), wherein: a mounting slot (102) is arranged in the housing (11, 12, 101), the display part is mounted in the mounting slot (102) and has a contact part (152) protruding from the mounting slot (102), the contact part (152) is connected to the power source, and the slider (13) slides so as to contact the contact part (152) to realize a connection between the electronic component (15) and the power source so that the second display information can be sent. [2] The display device (10) according to claim 1, wherein the first display information is a first color provided by the housing (11, 12, 101). [3] The display device (10) according to claim 2, wherein the second display information is a second color provided by the housing (11, 12, 101) and different from the first color. [4] The display device (10) according to claim 3, wherein the slider (13) has a structure with the second color. [5] Display device (10) according to claim 3 or 4, wherein: the housing (11, 12, 101) is provided with a display opening (111) for displaying the first color or the second color, and the seat belt (20) is tensioned to a certain extent to push the slider (13) against the damper to the display opening (111) to switch the display opening (111) from the first display information to the second display information. [6] A display device (10) according to any one of the preceding claims, further comprising an elastic element (14) arranged on the slider (13) and positioned in the housing (11, 12, 101), the elastic element (14) providing damping against the sliding of the slider (13) and returning the slider (13) to the initial position. [7] The display device (10) according to claim 6, wherein the elastic member (14) has a structure of a coil spring. [8] Display device (10) according to one of the preceding claims, wherein the slider (13) has a mounting part (131) for transporting the safety belt (20) and a limiting part (132, 133) which prevents the safety belt (20) from slipping out of the slider (13). [9] Display device (10) according to one of the preceding claims, wherein: a first limiting block (121) and a second limiting block (113) are arranged in the housing (11, 12, 101), and the slider (13) is slidably arranged between the first limiting block (121) and the second limiting block (113, 122). [10] Display device (10) according to one of the preceding claims, wherein: the display part is an electronic component (15) designed to send acoustic and / or optical information, and the display part is pressed by the sliding of the slider (13) so that it switches from the first display information to the second display information. [11] Display device (10) according to one of the preceding claims, wherein the first display information is silent information and the second display information is acoustic and / or optical information. [12] Display device (10) according to one of claims 1 to 10, wherein the first display information is acoustic and / or optical information and the second display information is acoustic and / or optical information which is different from the first display information. [13] A seat belt device comprising a seat belt (20) further comprising the display device (10) according to any one of claims 1 to 12, wherein the display device (10) is arranged on and connected to the seat belt (20). [14] Child safety transporter (100) comprising a transporter body (30) for carrying a child, wherein the child safety transporter (100) further comprises the safety belt device according to claim 13, and the safety belt (20) of the safety belt device is connected to the transporter body (30). [15] The child safety carrier (100) according to claim 14, wherein the carrier body (30) has a structure of a safety seat, a stroller, a cradle or a rocker.

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