Safety belt cutter

Abstract

The invention relates to the technical field of vehicle accessories, in particular to a safety belt cutter which comprises a fixing plate fixed to a safety belt and provided with a blade sliding hole, the blade sliding hole right faces the safety belt, and the length of the blade sliding hole is larger than the width of the safety belt in the width direction of the safety belt; the shell is slidably mounted on the surface, away from the safety belt, of the fixing plate in the width direction of the safety belt, a mounting cavity is formed in the shell, a blade extending hole is formed in the bottom wall, attached to the fixing plate, of the shell, the mounting cavity communicates with the blade sliding hole through the blade extending hole, and a pressing through hole is formed in the top wall of the shell; the mounting cavity is communicated with the outside through the pressing through hole; and the cutting mechanism is arranged in the mounting cavity, the first end of the cutting mechanism extends out of the pressing through hole, the second end of the cutting mechanism is provided with a cutting edge, and the cutting edge is right opposite to the cutting edge extending-out hole.

Description

Technical Field

[0001] The present invention belongs to the technical field of vehicle accessories, and particularly relates to a seat belt cutter. Background Art

[0002] With the development of social economy, the types of automobiles are increasing continuously and the degree of intelligence is constantly improving. People's frequency of using automobiles is getting higher and higher, which makes the frequency of traffic accidents increase correspondingly, posing a serious threat to people's lives and property safety. The seat belt is one of the most important safety protection devices inside the vehicle. When the vehicle is driving normally, it can effectively fix the driver and passengers on the seat, preventing them from being thrown out of the seat in case of sudden braking, collision, etc., thus reducing the risk of personnel injury.

[0003] However, seat belts usually have relatively high strength, and it is difficult to quickly cut the seat belt with an ordinary knife. In some special cases, such as serious traffic accidents resulting in damage to the seat belt lock hole, the seat belt being locked, or emergencies such as vehicle fires or water ingress, the seat belt may become a "restraint belt" that restrains the driver and passengers, making it impossible for them to quickly break free from the seat belt and escape from the dangerous area, thus causing secondary injuries or even endangering lives; in addition, the window glass is also an important part of safety protection and improving the comfort of the vehicle, but it is also a barrier blocking people's escape in case of an accident.

[0004] Traditional seat belt cutting tools are usually stored independently in the vehicle storage compartment. When an accident occurs, they need to be manually searched for and taken out, delaying the rescue time and increasing the risk of trapped people; most seat belt cutting tools are large in size or complex in operation, not suitable for one-handed quick operation; the cutting part on the seat belt cutting tool is prone to causing people to accidentally touch the blade due to design defects; the seat belt cutting tool does not have the function of breaking the window. Traditional window breakers are large in size and heavy in weight, inconvenient to carry, and difficult to quickly take out and use in an emergency. The window breaking efficiency of the window breaker is low, and it is impossible to quickly break the window glass in a short time; when using the window breaker, it is easy for the user to be injured due to improper operation or design defects of the window breaker; there are differences in the window materials and structures of different vehicle models, and some window breakers may only be applicable to specific types of windows, unable to meet the general needs of multiple vehicle models; the window breaker does not have the function of cutting the seat belt. Summary of the Invention

[0005] In view of this, the present invention aims to provide a seat belt cutter, which is at least beneficial to improving the efficiency of cutting the seat belt.

[0006] To achieve the above object, the technical solution of the present invention is realized as follows: The present invention provides a seat belt cutter, comprising: a fixing plate fixed to the seat belt, and a part of the surface on one side of the fixing plate is attached to a part of the surface on one side of the seat belt. The fixing plate has a blade sliding hole penetrating through the fixing plate in its thickness direction, and the blade sliding hole is aligned with the seat belt. In the width direction of the seat belt, the length of the blade sliding hole is greater than the width of the seat belt; a housing slidably mounted on the surface of the fixing plate away from the seat belt in the width direction of the seat belt. An installation cavity is provided in the housing, and the bottom wall of the housing attached to the fixing plate has a blade protruding hole. The installation cavity is connected to the blade sliding hole through the blade protruding hole. The top wall of the housing has a pressing through hole, and the installation cavity is connected to the outside through the pressing through hole; a cutting mechanism disposed in the installation cavity. The first end of the cutting mechanism extends out from the pressing through hole, and the second end of the cutting mechanism has a blade, and the blade is aligned with the blade protruding hole. Press the first end of the cutting mechanism so that the blade sequentially passes through the blade protruding hole and the blade sliding hole and extends to contact the seat belt. While pressing the first end of the cutting mechanism, slide the housing relative to the fixing plate so that the blade slides in the blade sliding hole in the width direction of the seat belt to cut the seat belt.

[0007] Further, the fixing plate has opposite first and second surfaces. A part of the second surface is attached to the seat belt. The first surface has two limiting sliding strips arranged at intervals and oppositely along the extending direction of the seat belt. The cross-sectional shape of the limiting sliding strip in a plane perpendicular to the extending direction of the limiting sliding strip is L-shaped; both side surfaces of the housing arranged along the extending direction of the seat belt have sliding grooves for cooperating with the sliding strips. When the housing is arranged on the fixing plate, the bent part of the limiting sliding strip towards the housing is embedded in the sliding groove.

[0008] Further, the seat belt cutter further comprises two fixing buckles, both of which are arranged on the second surface. The fixing plate is fixed to the seat belt through the fixing buckles. Among them, in the extending direction of the seat belt, the housing is located between the two fixing buckles; the fixing buckle includes an intermediate part with a first thickness and two end parts with a second thickness. The first thickness is less than the second thickness, and the surface of the intermediate part of the fixing buckle away from the fixing plate is flush with the surface of the end part of the fixing buckle away from the fixing plate. The end part of the fixing buckle contacts the fixing plate and is fixed together by screws. There is a spaced area between the intermediate part of the fixing buckle and the fixing plate, and the seat belt sequentially passes through the two spaced areas.

[0009] Further, the housing includes a main body part and a cover connected in sequence along the direction away from the fixing plate. The main body part and the cover enclose the installation cavity. The blade protruding hole is provided on the bottom wall of the main body part attached to the fixing plate, and the pressing through hole is provided on the cover.

[0010] Further, the installation cavity includes a first installation cavity and a second installation cavity arranged along the width direction of the seat belt. The cutting mechanism is arranged in the first installation cavity; the seat belt cutter further includes a window-breaking mechanism, and the window-breaking mechanism is arranged in the second installation cavity. The side wall of the housing on the side of the second installation cavity away from the first installation cavity has a pop-out hole, and the second installation cavity is communicated with the outside through the pop-out hole. The top wall of the housing corresponding to the second installation cavity has a first through hole, and the second installation cavity is communicated with the outside through the first through hole; the first end of the window-breaking mechanism extends out from the first through hole, the second end of the window-breaking mechanism has a tungsten carbide bullet head, and the tungsten carbide bullet head is aligned with the pop-out hole. After the housing is slid off the fixing plate, the first end of the window-breaking mechanism is controlled to make the tungsten carbide bullet head extend out or pop out from the pop-out hole to break the window.

[0011] Further, the window-breaking mechanism includes a fixed block, a launching spring, a limiting block and a tungsten carbide bullet head arranged in sequence along the direction away from the first installation cavity. Among them, the fixed block is fixed to the housing, the fixed block is connected to the launching spring, the limiting block is connected to the tungsten carbide bullet head, and the top of the limiting block has a push rod. The push rod, as the first end of the window-breaking mechanism, extends out from the first through hole. The push rod can move in the first through hole relative to the housing in the direction towards the pop-out hole or in the direction away from the pop-out hole. Push the push rod in the direction away from the pop-out hole, compress the launching spring and then release the push rod, and the launching spring pushes the tungsten carbide bullet head to pop out from the pop-out hole to break the window.

[0012] Further, the seat belt cutter further includes two limiting components. There are also two third installation cavities in the housing, and each third installation cavity is provided with a limiting component. The third installation cavities are located on the opposite sides of the second installation cavity in the extending direction of the seat belt, and one side of each third installation cavity facing the second installation cavity is communicated with the second installation cavity; the limiting component includes a slider and a first spring connected in sequence along the direction away from the second installation cavity. The end of the first spring away from the slider is fixed to the housing. When the slider contacts the tungsten carbide bullet head, the first spring is in a compressed state or a natural state. The top of the slider has a sliding rod, and the top wall of the housing corresponding to the third installation cavity has a second through hole. The sliding rod extends out from the second through hole. The sliding rod can move in the second through hole relative to the housing in the direction towards the second installation cavity or in the direction away from the second installation cavity; the outer diameter of the launching spring and the outer diameter of the tungsten carbide bullet head are both smaller than the outer diameter of the limiting block. The corner of the end of the limiting block connected to the tungsten carbide bullet head is arc-shaped. Push the push rod in the direction towards the pop-out hole to limit the limiting block on the side of the slider away from the first installation cavity. The tungsten carbide bullet head extends out from the pop-out hole, align the tungsten carbide bullet head with the car window glass and knock it to break the window; push the two sliding rods in the direction away from the window-breaking mechanism to disengage the limiting block, and the tungsten carbide bullet head retracts into the housing.

[0013] Further, the cutting mechanism includes a pressing rod, a second spring, a transmission member, a first bearing pair, a second bearing pair, and a cutting knife. The top of the first end of the transmission member is connected to the pressing rod. The pressing rod extends out of the pressing through-hole as the first end of the cutting mechanism. The bottom of the first end of the transmission member is connected to the second spring. The end of the second spring away from the transmission member is fixed on the housing. The second spring is in a compressed state or a natural state. The middle part of the transmission member is assembled on the rotor of the first bearing pair through a first rotating shaft. The stator of the first bearing pair is fixed to the housing. The transmission member can rotate around the first rotating shaft. The second end of the transmission member is rotatably connected to the first end of the cutting knife through a second rotating shaft. The middle part of the cutting knife is assembled on the rotor of the second bearing pair through a third rotating shaft. The stator of the second bearing pair is fixed to the housing. The cutting knife can rotate around the third rotating shaft. The second end of the cutting knife is the second end of the cutting mechanism, and the second end of the cutting knife has a blade edge.

[0014] Further, the blade edge extends from the second end of the cutting mechanism in a direction away from the cutting mechanism, and the end of the blade edge away from the cutting mechanism inclines towards the safety belt. The minimum included angle between the orthographic projection of the blade edge on the surface of the safety belt and the width direction of the safety belt is greater than 0° and less than 90°.

[0015] Further, the seat belt cutter further includes a positioning pin. The positioning pin penetrates through the fixing plate and extends into the housing, and the positioning pin is detachable.

[0016] Compared with the prior art, the present invention can achieve the following beneficial effects: The present invention provides a seat belt cutter, which can quickly cut the seat belt in an emergency when the seat belt cannot be unfastened, avoiding secondary injuries. After the housing is removed from the fixing plate, the housing also has the function of breaking the window; The way that the housing drives the blade edge to move relative to the fixing plate to cut the seat belt attached to the second surface of the fixing plate greatly improves the efficiency of cutting the seat belt; The seat belt cutter is directly fixed on the seat belt instead of being independently stored in the vehicle storage compartment, avoiding the need to manually search for and take out the seat belt cutter during an accident, which is beneficial to shortening the rescue time and reducing the risk of injury to trapped personnel; When not in use, the blade edge is completely embedded in the housing, avoiding damage to personnel; When in use, the blade edge forms a certain angle with the seat belt, facilitating quick and efficient cutting of the seat belt; The positioning pin is designed. Pulling out the positioning pin can make the housing slide relative to the fixing plate, and inserting the positioning pin can fix the housing relative to the fixing plate, which is simple, convenient and fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings: Figure 1A schematic structural diagram of the safety belt cutter according to an embodiment of the present invention at a first viewing angle; Figure 2 A schematic structural diagram of the seat belt cutter according to an embodiment of the present invention at a second viewing angle; Figure 3 A schematic diagram of a portion of the structure of a safety belt cutter according to an embodiment of the present invention; Figure 4 This is a schematic structural diagram of the limit assembly and window breaking mechanism described in an embodiment of the present invention.

[0018] Explanation of the accompanying drawings: 11, fixing plate; 10, safety belt; 103, blade sliding hole; 12, shell; 104, blade protrusion hole; 105, pressing through hole; 140, blade; 111, limiting slide; 101, positioning pin; 13, fixing buckle; 122, main body; 121, cover; 102, pop-up hole; 107, first through hole; 151, tungsten steel bullet; 154, fixing block; 153, launching spring; 152, limiting block; 150, push rod; 162, slider; 161, first spring; 160, slide rod; 106, second through hole; 141, pressing rod; 142, transmission member; 143, first bearing pair; 145, second bearing pair; 144, cutting knife. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and do not constitute a limitation of the present invention.

[0020] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0022] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art can understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0023] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0024] refer to Figures 1 to 4, the present invention provides a seat belt cutter, comprising: a fixed plate 11, the fixed plate 11 is fixed on the seat belt 10, and the fixed plate 11 can slide along the extension direction of the seat belt 10 on the seat belt 10. A part of the surface of one side of the fixed plate 11 is attached to a part of the surface of one side of the seat belt 10. The fixed plate 11 has a blade sliding hole 103 penetrating through the fixed plate 11 along its thickness direction. The blade sliding hole 103 is opposite to the seat belt 10. In the width direction of the seat belt 10, the length of the blade sliding hole 103 is greater than the width of the seat belt 10; a housing 12, the housing 12 is slidably mounted on the surface of the fixed plate 11 away from the seat belt 10 along the width direction of the seat belt 10. The housing 12 has an installation cavity. The bottom wall of the housing 12 attached to the fixed plate 11 has a blade protruding hole 104. The installation cavity is connected to the blade sliding hole 103 through the blade protruding hole 104. The top wall of the housing 12 has a pressing through hole 105. The installation cavity is connected to the outside through the pressing through hole 105; a cutting mechanism, the cutting mechanism is arranged in the installation cavity. The first end of the cutting mechanism extends out from the pressing through hole 105. The second end of the cutting mechanism has a blade 140. The blade 140 is opposite to the blade protruding hole 104. Press the first end of the cutting mechanism so that the blade 140 extends out through the blade protruding hole 104 and the blade sliding hole 103 in sequence and contacts the seat belt 10. While pressing the first end of the cutting mechanism, slide the housing 12 relative to the fixed plate 11 so that the blade 140 slides in the blade sliding hole 103 along the width direction of the seat belt 10 to cut the seat belt 10.

[0025] Further, the fixed plate 11 has opposite first and second surfaces. A part of the second surface is attached to the seat belt 10. The first surface has two limiting slide bars 111 arranged at intervals along the extension direction of the seat belt 10 and oppositely arranged. The cross-sectional shape of the limiting slide bars 111 in a plane perpendicular to the extension direction of the limiting slide bars 111 is L-shaped; both side surfaces of the housing 12 arranged along the extension direction of the seat belt 10 have chutes cooperating with the limiting slide bars 111. When the housing 12 is arranged on the fixed plate 11, the bent parts of the limiting slide bars 111 towards the housing 12 are embedded in the chutes. In this way, the housing 12 can slide on the fixed plate 11 and can only be separated from the fixed plate 11 by sliding.

[0026] Further, the seat belt cutter further includes a positioning pin 101. The positioning pin 101 penetrates through the fixed plate 11 and extends into the housing 12. The positioning pin 101 is detachable. The positioning pin 101 is used to limit the movement of the housing 12 to prevent the housing 12 from moving along the limiting slide bars 111 when the housing 12 does not need to slide. When the housing 12 needs to slide, the positioning pin 101 can be pulled out.

[0027] Further, the seat belt cutter further includes two fixing buckles 13, both of the two fixing buckles 13 are arranged on the second surface, and the fixing plate 11 is fixed on the seat belt 10 through the fixing buckles 13. Wherein, along the extending direction of the seat belt 10, the housing 12 is located between the two fixing buckles 13; the fixing buckle 13 includes an intermediate part with a first thickness and two end parts with a second thickness, the first thickness is less than the second thickness, and the surface of the intermediate part of the fixing buckle 13 away from the fixing plate 11 is flush with the surface of the end part of the fixing buckle 13 away from the fixing plate 11. The end part of the fixing buckle 13 is in contact with the fixing plate 11 and fixed together by screws. There is a spaced area between the intermediate part of the fixing buckle 13 and the fixing plate 11, and the seat belt 10 passes through the two spaced areas in sequence. With such a setting, interference caused by the fixing buckle 13 to the cooperation between the housing 12 and the fixing plate 11 is avoided.

[0028] Further, the housing 12 includes a main body part 122 and a cover 121 which are sequentially connected along the direction away from the fixing plate 11. The main body part 122 and the cover 121 enclose an installation cavity. The blade protruding hole 104 is arranged on the bottom wall where the main body part 122 is attached to the fixing plate 11, and the pressing through hole 105 is arranged on the cover 121. In this way, it is convenient to disassemble and assemble the components in the installation cavity. In some examples, the main body part 122 and the cover 121 are fixed by screws.

[0029] Further, the installation cavity includes a first installation cavity and a second installation cavity arranged along the width direction of the seat belt 10. The cutting mechanism is arranged in the first installation cavity; the seat belt cutter further includes a window-breaking mechanism, and the window-breaking mechanism is arranged in the second installation cavity. The side wall of the housing 12 on the side of the second installation cavity away from the first installation cavity has a pop-out hole 102, and the second installation cavity is communicated with the outside through the pop-out hole 102. The top wall of the housing 12 corresponding to the second installation cavity has a first through hole 107, and the second installation cavity is communicated with the outside through the first through hole 107; the first end of the window-breaking mechanism extends out from the first through hole 107, the second end of the window-breaking mechanism has a tungsten carbide bullet head 151, and the tungsten carbide bullet head 151 is aligned with the pop-out hole 102. After sliding the housing 12 off the fixing plate 11, control the first end of the window-breaking mechanism to make the tungsten carbide bullet head 151 extend out or pop out from the pop-out hole 102 to break the window. In this way, the seat belt cutter not only has the function of cutting the seat belt 10, but after removing the housing 12 from the fixing plate 11, the tungsten carbide bullet head 151 can also be used to break the window glass, realizing an efficient window-breaking operation, saving time and enabling the people in the vehicle to escape from the vehicle as soon as possible.

[0030] Further, the window-breaking mechanism includes a fixed block 154, a launching spring 153, a limiting block 152, and a tungsten carbide bullet 151 arranged in sequence along the direction away from the first installation cavity. Among them, the fixed block 154 is fixed to the housing 12, the fixed block is connected to the launching spring, the limiting block is connected to the tungsten carbide bullet, the top of the limiting block 152 has a push rod 150, and the push rod 150, as the first end of the window-breaking mechanism, extends out of the first through hole 107. The push rod 150 is movable relative to the housing 12 in the first through hole 107 in the direction towards the ejection hole 102 or in the direction away from the ejection hole 102. Push the push rod 150 in the direction away from the ejection hole 102, compress the launching spring 153 and then release the push rod 150, and the launching spring 153 pushes the tungsten carbide bullet 151 to eject from the ejection hole 102 to break the window.

[0031] Further, the seat belt cutter further includes two limiting components. There are also two third installation cavities in the housing 12, and each third installation cavity is provided with a limiting component. The third installation cavities are located on the opposite sides of the second installation cavity in the extending direction of the seat belt 10, and one side of each third installation cavity facing the second installation cavity is communicated with the second installation cavity; the limiting component includes a slider 162 and a first spring 161 connected in sequence along the direction away from the second installation cavity. One end of the first spring 161 away from the slider 162 is fixed to the housing 12. When the slider 162 contacts the tungsten carbide bullet 151, the first spring 161 is in a compressed state or a natural state. The top of the slider 162 has a sliding rod 160. The top wall of the housing 12 corresponding to the third installation cavity has a second through hole 106, and the sliding rod 160 extends out of the second through hole 106. The sliding rod 160 is movable relative to the housing 12 in the second through hole 106 in the direction towards the second installation cavity or in the direction away from the second installation cavity; the outer diameter of the launching spring 153 and the outer diameter of the tungsten carbide bullet 151 are both smaller than the outer diameter of the limiting block 152. The corner of the end of the limiting block 152 connected to the tungsten carbide bullet 151 is arc-shaped. Push the push rod 150 in the direction of the ejection hole 102 to limit the limiting block 152 on the side of the slider 162 away from the first installation cavity. The tungsten carbide bullet 151 extends out of the ejection hole 102, aligns the tungsten carbide bullet 151 with the window glass and strikes it to break the window; push the two sliding rods 160 in the direction away from the window-breaking mechanism to disengage the limiting block 152, and the tungsten carbide bullet 151 retracts into the housing 12.

[0032] In some embodiments, the side of the slider 162 away from the ejection hole 102 is arc-shaped. In this way, when the tungsten carbide bullet advances, it will push the limiting component to move to both sides, avoiding the slider from affecting the firing of the tungsten carbide bullet.

[0033] That is to say, the launching spring 153 can be used to provide the breaking power for the tungsten carbide bullet 151 to achieve ejection window breaking, or the tungsten carbide bullet 151 can be fixed in an extended state and the window can be broken by knocking.

[0034] For ejection window breaking, you first need to use the push rod 150 to move the tungsten steel bullet 151 in the direction of compressing the launch spring 153. During ejection, move the push rod 150 to a position directly opposite the first through hole 107. The tungsten steel bullet 151 ejects outward along the extension direction of the second mounting cavity and directly acts on the car window glass to break the window. To prevent unsuccessful window breaking, you can use a limit assembly to fix the tungsten steel bullet 151 in an extended state, and then use a knocking method to break the window; if you want to use ejection window breaking again, you only need to use the slide bar 160 to drive the slider 162 to move in the direction of compressing the first spring 161, and at the same time use the push rod 150 to move the tungsten steel bullet 151 into the housing 12, and then you can perform the ejection window breaking operation again.

[0035] It should be noted that the size of the tungsten steel bullet is smaller than the pop-up hole. The launching spring and the limit block may be connected or not. When the launching spring and the limit block are not connected, it is necessary to ensure that the size of the limit block is larger than the pop-up hole and the size of the tungsten steel bullet is smaller than the pop-up hole.

[0036] Furthermore, the cutting mechanism includes a pressing rod 141, a second spring, a transmission member 142, a first bearing pair 143, a second bearing pair 145 and a cutting knife 144. The top of the first end of the transmission member 142 is connected to the pressing rod 141. The pressing rod 141 extends from the pressing through hole 105 as the first end of the cutting mechanism. The bottom of the first end of the transmission member 142 is connected to the second spring. The end of the second spring away from the transmission member 142 is fixed to the housing 12. The second spring is in a compressed state or a natural state. The middle part of the transmission member 142 is assembled on the first shaft through the first rotating shaft. On the mover of the bearing pair 143, the stator of the first bearing pair 143 is fixed to the housing 12, the transmission member 142 is rotatable around the first rotating shaft, the second end of the transmission member 142 is rotatably connected to the first end of the cutting knife 144 through the second rotating shaft, the middle part of the cutting knife 144 is assembled on the mover of the second bearing pair 145 through the third rotating shaft, the stator of the second bearing pair 145 is fixed to the housing 12, the cutting knife 144 is rotatable around the third rotating shaft, the second end of the cutting knife 144 serves as the second end of the cutting mechanism, and the second end of the cutting knife 144 has a blade 140.

[0037] Furthermore, the blade 140 extends from the second end of the cutting mechanism away from the cutting mechanism, and the end of the blade 140 away from the cutting mechanism is inclined toward the safety belt. The minimum angle between the orthographic projection of the blade 140 on the surface of the safety belt 10 and the width direction of the safety belt 10 is greater than 0° and less than 90°. This helps improve the efficiency of cutting the safety belt 10.

[0038] Among them, the second spring is used to prevent the blade 140 from protruding out of the blade protruding hole 104 when the pressing rod 141 is not subjected to a pressing force. During use, press the pressing rod 141 with the palm of the hand, so that the end of the transmission member 142 away from the pressing rod 141 inclines towards the top of the housing 12, thereby driving the first end of the cutting knife 144 to incline towards the top of the housing 12, and the second end of the cutting knife 144 inclines towards the blade protruding hole 104, so that the blade 140 contacts the seat belt 10 through the blade protruding hole 104 and the blade sliding hole 103, and slides the housing 12 relative to the fixing plate 11 to cut the seat belt 10.

[0039] The seat belt cutter provided by the present invention can be fixed at a position close to the buckle of the seat belt 10. The seat belt cutter provided by the present invention has both the seat belt 10 cutting function and the window breaking function; and it is directly fixed on the seat belt 10, so it will not be stored independently in the vehicle storage compartment. When an accident occurs, it avoids manual searching and taking out, which is beneficial to reducing the escape time and reducing the risk of injury to trapped personnel; when not in use, the blade 140 is completely hidden in the housing 12, avoiding damage to personnel, and when in use, the blade 140 forms a certain angle with the seat belt 10, which is convenient for quickly cutting the seat belt 10.

[0040] It should be understood that various forms of processes shown above can be used, steps can be reordered, added or deleted. For example, the steps described in the disclosure of the present invention can be executed in parallel, sequentially or in a different order, as long as the desired results of the technical solution disclosed in the present invention can be achieved. There is no limitation herein.

[0041] The above specific embodiments do not constitute a limitation to the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub - combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A seat belt cutter, characterized in that, Comprising: A fixing plate which is fixed on the safety belt, and a part of the surface on one side of the fixing plate is attached to a part of the surface on one side of the safety belt. The fixing plate has a blade sliding hole penetrating through the fixing plate along its thickness direction, and the blade sliding hole is opposite to the safety belt. In the width direction of the safety belt, the length of the blade sliding hole is greater than the width of the safety belt; A housing which is slidably mounted on the surface of the fixing plate away from the safety belt along the width direction of the safety belt. An installation cavity is provided in the housing. The bottom wall of the housing attached to the fixing plate has a blade protruding hole, and the installation cavity is communicated with the blade sliding hole through the blade protruding hole. The top wall of the housing has a pressing through hole, and the installation cavity is communicated with the outside through the pressing through hole; A cutting mechanism which is arranged in the installation cavity. The first end of the cutting mechanism extends out from the pressing through hole, and the second end of the cutting mechanism has a blade. The blade is opposite to the blade protruding hole. Press the first end of the cutting mechanism so that the blade extends out through the blade protruding hole and the blade sliding hole in sequence and contacts the safety belt. While pressing the first end of the cutting mechanism, slide the housing relative to the fixing plate so that the blade slides along the width direction of the safety belt in the blade sliding hole to cut the safety belt.

2. The seat belt cutter according to claim 1, wherein The fixing plate has opposite first and second surfaces. A part of the second surface is attached to the safety belt. The first surface has two limiting slide bars arranged at intervals and oppositely along the extending direction of the safety belt. The cross-sectional shape of the limiting slide bar in a plane perpendicular to the extending direction of the limiting slide bar is L-shaped; Both side surfaces of the housing arranged along the extending direction of the safety belt have chutes cooperating with the slide bars. When the housing is arranged on the fixing plate, the bent part of the limiting slide bar towards the housing is embedded in the chute.

3. The seat belt cutter according to claim 2, characterized in that, The safety belt cutter further includes two fixing buckles, and both of the two fixing buckles are arranged on the second surface. The fixing plate is fixed on the safety belt through the fixing buckles. Among them, in the extending direction of the safety belt, the housing is located between the two fixing buckles; The fixing buckle includes an intermediate part with a first thickness and two end parts with a second thickness. The first thickness is less than the second thickness, and the surface of the intermediate part of the fixing buckle away from the fixing plate is flush with the surface of the end part of the fixing buckle away from the fixing plate. The end part of the fixing buckle contacts the fixing plate and is fixed together by screws. There is an interval area between the intermediate part of the fixing buckle and the fixing plate, and the safety belt passes through the two interval areas in sequence.

4. The seat belt cutter according to claim 1, wherein, The housing includes a main body part and a cover connected in sequence along the direction away from the fixing plate. The main body part and the cover enclose the installation cavity. The blade protruding hole is arranged on the bottom wall of the main body part attached to the fixing plate, and the pressing through hole is arranged on the cover.

5. The seat belt cutter according to claim 1, characterized in that, The installation cavity includes a first installation cavity and a second installation cavity arranged along the width direction of the seat belt, and the cutting mechanism is arranged in the first installation cavity; The seat belt cutter further includes a window-breaking mechanism, the window-breaking mechanism is arranged in the second installation cavity, a side wall of the housing on a side of the second installation cavity away from the first installation cavity has an ejection hole, the second installation cavity is communicated with the outside through the ejection hole, a top wall of the housing corresponding to the second installation cavity has a first through hole, and the second installation cavity is communicated with the outside through the first through hole; A first end of the window-breaking mechanism extends out from the first through hole, a second end of the window-breaking mechanism has a tungsten carbide bullet head, the tungsten carbide bullet head is aligned with the ejection hole, after the housing is slid off from the fixing plate, the first end of the window-breaking mechanism is controlled to enable the tungsten carbide bullet head to extend out or eject from the ejection hole to break the window.

6. The seat belt cutter according to claim 5, characterized in that, The window-breaking mechanism includes a fixed block, a launching spring, a limiting block and a tungsten carbide bullet head arranged in sequence along a direction away from the first installation cavity. Among them, the fixed block is fixed to the housing, the fixed block is connected to the launching spring, the limiting block is connected to the tungsten carbide bullet head, a push rod is provided at the top of the limiting block, the push rod serves as the first end of the window-breaking mechanism and extends out from the first through hole, the push rod can move in a direction towards the ejection hole or in a direction away from the ejection hole in the first through hole relative to the housing, the push rod is pushed in a direction away from the ejection hole, the launching spring is compressed and then the push rod is released, and the launching spring pushes the tungsten carbide bullet head to eject from the ejection hole to break the window.

7. The seat belt cutter according to claim 6, characterized in that, The seat belt cutter further includes two limiting components. The housing further has two third installation cavities, and each third installation cavity is provided with one limiting component. The third installation cavities are located on opposite sides of the second installation cavity in the extending direction of the seat belt, and one side of each third installation cavity facing the second installation cavity is communicated with the second installation cavity; The limiting component includes a slider and a first spring connected in sequence along a direction away from the second installation cavity. One end of the first spring away from the slider is fixed to the housing. When the slider contacts the tungsten carbide bullet head, the first spring is in a compressed state or a natural state. A sliding rod is provided at the top of the slider, a top wall of the housing corresponding to the third installation cavity has a second through hole, and the sliding rod extends out from the second through hole. The sliding rod can move in a direction towards the second installation cavity or in a direction away from the second installation cavity in the second through hole relative to the housing; The outer diameter of the launching spring and the outer diameter of the tungsten carbide bullet head are both smaller than the outer diameter of the limiting block. A corner of an end of the limiting block connected to the tungsten carbide bullet head is arc-shaped. The push rod is pushed in a direction towards the ejection hole to limit the limiting block on a side of the slider away from the first installation cavity. The tungsten carbide bullet head extends out from the ejection hole, and the tungsten carbide bullet head is aligned with the window glass and struck to break the window. Push the two sliding rods away from the window-breaking mechanism, so that the limit block is disengaged from the limit, and the tungsten carbide bullet head is retracted into the shell body.

8. The seat belt cutter according to claim 1, wherein, The cutting mechanism includes a pressing rod, a second spring, a transmission member, a first bearing pair, a second bearing pair, and a cutting knife. The top of the first end of the transmission member is connected to the pressing rod. The pressing rod extends out of the pressing through hole as the first end of the cutting mechanism. The bottom of the first end of the transmission member is connected to the second spring. The end of the second spring away from the transmission member is fixed on the shell body. The second spring is in a compressed state or a natural state. The middle part of the transmission member is assembled on the rotor of the first bearing pair through a first rotating shaft. The stator of the first bearing pair is fixed to the shell body. The transmission member can rotate around the first rotating shaft. The second end of the transmission member is rotatably connected to the first end of the cutting knife through a second rotating shaft. The middle part of the cutting knife is assembled on the rotor of the second bearing pair through a third rotating shaft. The stator of the second bearing pair is fixed to the shell body. The cutting knife can rotate around the third rotating shaft. The second end of the cutting knife is the second end of the cutting mechanism, and the second end of the cutting knife has a blade.

9. The seat belt cutter according to claim 1, wherein, The blade extends away from the second end of the cutting mechanism, and the end of the blade away from the cutting mechanism inclines towards the seat belt. The minimum included angle between the orthographic projection of the blade on the surface of the seat belt and the width direction of the seat belt is greater than 0° and less than 90°.

10. The seat belt cutter according to claim 1, characterized in that, The seat belt cutter further includes a positioning pin. The positioning pin penetrates through the fixing plate and extends into the shell body, and the positioning pin is detachable.

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