Restraint device

Abstract

A restraint device comprises a first restraint strap, a second restraint strap, a first locking part, a second locking part and a switching control part, the first restraint strap is provided with a first locking piece, the second restraint strap is provided with a second locking piece, the first locking part is provided with a first limiting piece, the second locking part is provided with a second limiting piece, and the switching control part comprises a movable piece, a fixed piece and a transmission piece. A ratchet wheel transmission structure or a cam groove transmission structure is formed among the moving part, the fixed part and the transmission part, so that the first limiting part and / or the second limiting part can be driven to move every time the moving part and the fixed part are subjected to external force, and the locking states of the first locking part and the second locking part are switched. The first fixing part and the second fixing part are fixed to the hand or the leg, the fixing piece is fixed to the bed edge or other firm positions, and therefore every time the first fixing part or the second fixing part is pulled, namely the switching control part can switch the locking state of the first locking part and the locking state of the second locking part under the action of external force once.

Description

Technical Field

[0001] This application relates to the field of medical auxiliary devices, and particularly to a restraint device. Background Art

[0002] In clinical care, for patients with disorders of consciousness such as those not yet awake from anesthesia, in a coma, or agitated, restraint devices are needed to prevent falling out of bed, extubation, self-harm, or aggressive behavior, ensuring the safety of patients and medical procedures. Traditional restraint straps achieve protection by fixing the limbs to the edge of the bed or other firm positions. Especially for agitated patients, they often struggle violently to break free. Therefore, a more secure and stable fixation method is required. If the limb fixation position is too loose, there are safety hazards and it is easy to slip or be misaligned. If the fixation position is too tight, it may cause skin lacerations or abrasions, with poor comfort, and pressure sores are likely to occur at the fixation position after long-term use, further affecting the wearing comfort.

[0003] The patent application with the Chinese patent publication number "CN215020095U" and the name "Y-shaped restraint strap" discloses a Y-shaped restraint strap. A Y-shaped structure is formed by a first strap, a second strap, and a third strap. Different positions of the arm are fixed using magnetic buttons and magnetic button holes to form a stable triangular structure, combined with Velcro for fixation to reduce the risk of breaking free, and the width and thickness are increased at the skin contact part to reduce frictional injuries. In this solution, the long-term stress positions are the same, and pressure sores are likely to occur at the positions with greater stress or The patent application with the Chinese patent publication number "CN106308998B" and the name "Restraint Strap" discloses a restraint strap, including a first strap for fixation and a second strap for restraint. One ends of the first and second straps are fixedly connected together. A Japanese character buckle or double-ring buckle is provided at the end of the first strap away from the second strap, and the other end of the first strap forms a fastening fit with the Japanese character buckle or double-ring buckle. The end of the second strap away from the first strap is fixed to the first strap or the second strap through Velcro, a Japanese character buckle, or a double-ring buckle. By providing the first strap and the Japanese character buckle and double-ring buckle at one end of the first strap, the restraint strap can be reliably fixed to the bed frame or other brackets, and then the patient's limb is restrained by the second strap. The strength and length of this restraint can be adjusted without affecting the reliability of the fixation of the first strap. Summary of the Invention

[0004] This application provides a restraint device to at least solve the above technical problems existing in the prior art.

[0005] According to the present application, a restraint device is provided, which includes a first restraint band, a second restraint band, a first locking portion, a second locking portion, and a switching control portion. The first restraint band is provided with a first locking member, the second restraint band is provided with a second locking member, the first locking portion is provided with a first limiting member, the second locking portion is provided with a second limiting member, and the switching control portion includes a moving member, a fixing member, and a transmission member. A ratchet drive structure or a cam groove drive structure is formed among the moving member, the fixing member, and the transmission member, so that when the moving member and the fixing member move relatively back and forth once under the action of an external force, the first limiting member and / or the second limiting member can be driven to move, and the locking states of the first locking portion and the second locking portion are switched. The moving member is fixed to the first locking portion and the second locking portion and moves synchronously; when the first locking member is in the locking position and the first locking portion is in the locking state, the first locking member can be locked by the first limiting member driven by the switching control portion, and when the second locking member is in the locking position and the first locking portion is in the locking state, the second locking member can be locked by the second limiting member driven by the switching control portion.

[0006] The first restraint band includes a first fixing portion, a first connecting band, and a first elastic member. The two ends of the first connecting band are respectively connected to the first fixing portion and the first elastic member. The first connecting band is provided with a first locking member, and one end of the first elastic member is fixedly connected to the first locking portion. When the first connecting band is not affected by an external force, the first elastic member can move the first locking member to the first locking portion.

[0007] The second restraint band includes a second fixing portion, a second connecting band, and a second elastic member. The two ends of the second connecting band are respectively connected to the second fixing portion and the second elastic member. The second connecting band is provided with a second locking member, and one end of the second elastic member is fixedly connected to the second locking portion. When the second connecting band is not affected by an external force, the second elastic member can move the second locking member to the second locking portion.

[0008] Compared with the prior art, the restraint device of the present application has the following beneficial effects: Fix the first fixing part and the second fixing part to the hand or leg, and fix the fixing member to the edge of the bed or other firm positions. Thus, each time the first fixing part or the second fixing part is pulled, that is, when the switching control part is subjected to an external force, the locking states of the first locking part and the second locking part can be switched. For example, currently the first locking part is in the locked state, the force on the first fixing part is relatively larger than that on the second fixing part, and the second fixing part is subjected to the action of the second elastic member and the force on it is relatively smaller than that on the first fixing part or basically not subjected to force. To switch the locking state, by pulling the first fixing part, the moving member and the fixing member are forced to move relative to each other, driving the first limiting member and the second limiting member to move, and switching the locking states of the first locking part and the second locking part, so that the second locking part is in the locked state and the first locking part is in the unlocked state. Thus, the force on the second fixing part is relatively larger than that on the first fixing part, and the first fixing part is subjected to the action of the first elastic member and the force on it is relatively smaller than that on the second fixing part or basically not subjected to force. In this way, the first fixing part and the second fixing part can switch the force, and only one retraction and release is required to achieve the switch, without being subjected to force at the same position for a long time. The third fixing part or even more fourth fixing parts can be set as needed to alternately switch the force-bearing positions. Under some extreme conditions, if the patient cannot complete the switch due to continuous exertion for a long time, the switch can also be assisted by medical staff, that is, retract and release the first connecting belt and the second connecting belt once.

[0009] In an implementable embodiment, the first locking part is provided with a first sliding groove, the first locking member can slide relative to the first locking part along the first sliding groove, the first locking member is provided with a first serrated part, and the first serrated part is provided with reverse teeth so that the first locking member is not locked when moving in the direction of inserting into the first locking part, but the first locking member can be locked by the first limiting member when moving in the direction of pulling out of the first locking part; the second locking part is symmetrically arranged with the first locking part, the second locking part is provided with a second sliding groove, the second locking member can slide relative to the second locking part along the second sliding groove, the second locking member is provided with a second serrated part, and the second serrated part is provided with reverse teeth so that the second locking member is not locked when moving in the direction of inserting into the second locking part, but the second locking member can be locked by the second limiting member when moving in the direction of pulling out of the second locking part. The reverse teeth can achieve one-way locking, and multiple reverse teeth can also achieve the function of locking at multiple positions.

[0010] In an implementable embodiment, the first limiting member is provided with a first hinge shaft and a first guiding shaft, and the moving member is provided with a first guiding groove, or the first limiting member is provided with a first hinge shaft and a first guiding groove, and the moving member is provided with a first guiding shaft. The first hinge shaft is installed on the moving member, and the first guiding shaft is located in the first guiding groove, such that when the moving member moves relative to the fixed member, the first guiding shaft slides in the first guiding groove to drive the first limiting member to rotate. When the first limiting member rotates to a first angle, the locking portion of the first limiting member can abut against the first serrated portion. When the first limiting member rotates to a second angle, the locking portion of the first limiting member separates from the first serrated portion. The second limiting member is provided with a second hinge shaft and a second guiding shaft, and the moving member is provided with a second guiding groove, or the second limiting member is provided with a second hinge shaft and a second guiding groove, and the moving member is provided with a second guiding shaft. The second hinge shaft is installed on the moving member, and the second guiding shaft is located in the second guiding groove, such that when the moving member moves relative to the fixed member, the second guiding shaft slides in the second guiding groove to drive the second limiting member to rotate. When the second limiting member rotates to the second angle, the locking portion of the second limiting member can abut against the second serrated portion. When the second limiting member rotates to the second angle, the locking portion of the second limiting member separates from the second serrated portion. The first limiting member and the second limiting member can be made of an elastic material, such as high-strength engineering plastic, so as to achieve the one-way locking function and control of the moving member.

[0011] In an implementable embodiment, an elastic reset member is provided between the moving member and the fixed member, and the elastic force direction of the elastic reset member is opposite to the pulling force directions of the first connecting belt and the second connecting belt. The restraint belt is usually subjected to unidirectional force, so it is necessary to provide an elastic reset member.

[0012] In an implementable embodiment, the moving member is provided with a cam groove, and the transmission member is hinged and fixed to the fixed member, or the fixed member is provided with a cam groove, and the transmission member is hinged and fixed to the moving member. The transmission member is U-shaped. The first end of the transmission member is inserted into the cam groove, and the second end of the transmission member is inserted into the hinge hole of the moving member or the fixed member, such that when the moving member moves relative to the fixed member along the first direction, the first end of the transmission member can slide in the cam groove. The position of the cam groove does not affect the relative movement. Therefore, the cam groove can be provided on the moving member or the fixed member, and finally the first limiting member and the second limiting member are driven through the relative movement.

[0013] In an implementable embodiment, the cam groove is provided with a first inflection point, a second inflection point, a third inflection point, and a fourth inflection point. The first inflection point and the third inflection point have a certain distance in the first direction. When the second end of the transmission member moves forward and backward in the first direction, the first end of the transmission member moves sequentially along the first inflection point, the second inflection point, the third inflection point, and the fourth inflection point in the cam groove. That is, when the second end of the transmission member moves forward in the first direction, the first end of the transmission member reaches the second inflection point from the first inflection point; then when the second end of the transmission member moves in the direction opposite to the first direction, the first end of the transmission member reaches the third inflection point from the second inflection point; when the second end of the transmission member moves forward in the first direction again, the first end of the transmission member reaches the fourth inflection point from the third inflection point; then when the second end of the transmission member moves in the direction opposite to the first direction, the first end of the transmission member returns to the first inflection point from the fourth inflection point. The technical solution of the present application is to pull once to switch the locking position. Pulling once will move back and forth once, and moving back and forth twice is a cycle. Therefore, four inflection points need to be set.

[0014] In an implementable embodiment, a first cam surface is provided in the first direction of the first inflection point. When the first end of the transmission member is at the first inflection point, the center of the cross-section of the first end can be projected onto the first cam surface in the first direction, so that when the first end moves in the first direction, it can abut against the first cam surface and move along the first cam surface to reach the second inflection point; a second cam surface is provided in the direction opposite to the first direction of the second inflection point. When the first end of the transmission member is at the second inflection point, the center of the cross-section of the first end can be projected onto the second cam surface in the direction opposite to the first direction, so that when the first end moves in the direction opposite to the first direction, it can abut against the second cam surface and move along the second cam surface to reach the third inflection point; a third cam surface is provided in the first direction of the third inflection point. When the first end of the transmission member is at the third inflection point, the center of the cross-section of the first end can be projected onto the third cam surface in the first direction, so that when the first end moves in the first direction, it can abut against the third cam surface and move along the third cam surface to reach the fourth inflection point; a fourth cam surface is provided in the direction opposite to the first direction of the fourth inflection point. When the first end of the transmission member is at the fourth inflection point, the center of the cross-section of the first end can be projected onto the fourth cam surface in the direction opposite to the first direction, so that when the first end moves in the direction opposite to the first direction, it can abut against the fourth cam surface and move along the fourth cam surface to reach the first inflection point. The setting of the cam surface ensures the sliding direction of the transmission member. The cam surface can deviate from a certain position in any direction perpendicular to the first direction. Of course, it is necessary to ensure that the first end of the transmission member can follow the movement. For example, the transmission member is made of an elastic material and can undergo elastic deformation to store elastic potential energy, so that the first end of the transmission member can closely move along the cam groove.

[0015] In one possible implementation, the fixing member is provided with a cam groove, and the transmission member is provided with a convex shaft that matches the cam groove, or the transmission member is provided with a cam groove, and the fixing member is provided with a convex shaft that matches the cam groove. The transmission member is hinged and fixed to the moving member. The cam groove is arranged on the cylindrical surface such that the convex shaft moves along the cylindrical surface. When the moving member moves back and forth relative to the fixing member in the first direction, the sliding of the convex shaft in the cam groove can drive the transmission member to rotate relative to the moving member. The rotation of the driving member can also change the locking state. For example, by driving the first limiting member and the second limiting member to move through a cam, or directly realizing the locking function through the cam.

[0016] In one possible implementation, the cam groove includes a vertical groove and a spiral groove. There are at least two vertical grooves and spiral grooves. The vertical groove is higher than the spiral groove at the transition position between the vertical groove and the spiral groove, so that there is a stepped surface in the vertical groove. The convex shaft is provided with an elastic member such that the convex shaft can keep abutting against the bottom of the cam groove. In this way, the convex shaft will not rotate relatively when sliding in the vertical groove, and the convex shaft can rotate relatively when sliding in the spiral groove.

[0017] In one possible implementation, the transmission member is provided with a locking cam in the first direction. When the locking cam rotates to the first angle, it can limit the relative movement of the first locking member in the first direction. When the locking cam rotates to the second angle, it can limit the relative movement of the second locking member in the first direction. In this way, the locking structure is simpler.

[0018] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] By referring to the drawings and reading the following detailed description, the above and other purposes, features, and advantages of the exemplary embodiments of the present application will become easy to understand. In the drawings, several embodiments of the present application are shown in an exemplary rather than restrictive manner, where: In the drawings, the same or corresponding reference numerals represent the same or corresponding parts.

[0020] Figure 1 The schematic diagram of the composition structure of the restraint device of Embodiment 1 of the present application is shown; Figure 2 The schematic diagram of the open housing state of the restraint device of Embodiment 1 of the present application is shown; Figure 3 The schematic diagram of removing the housing of the restraint device of Embodiment 1 of the present application is shown; Figure 4 The schematic diagram of the locked state of the first locking member of the restraint device of Embodiment 1 of the present application is shown; Figure 5 The schematic diagram of the locked state of the second locking member of the restraint device of Embodiment 1 of the present application is shown; Figure 6 Shows a schematic diagram of the switching control part of the restraint device in Embodiment 1 of the present application; Figure 7 Shows a schematic diagram of the cam groove structure of the restraint device in Embodiment 1 of the present application; Figure 8 Shows a schematic diagram of the cam groove of the restraint device in Embodiment 2 of the present application; Figure 9 Shows a schematic diagram of the drive bar of the restraint device in Embodiment 3 of the present application; Figure 10 Shows a schematic diagram of the open state of the housing of the restraint device in Embodiment 4 of the present application; Figure 11 Shows a schematic diagram of the removed housing of the restraint device in Embodiment 4 of the present application; Figure 12 Shows a three-dimensional schematic diagram of the fixing part of the restraint device in Embodiment 4 of the present application; Figure 13 Shows a schematic diagram of the transmission part of the restraint device in Embodiment 4 of the present application Figure 1 ; Figure 14 Shows a schematic diagram of the transmission part of the restraint device in Embodiment 4 of the present application Figure 2 ; Figure 15 Shows a schematic diagram of the sliding along the cam groove plane of the restraint device in Embodiment 4 of the present application; Figure 16 Shows a schematic diagram of the switching control part of the restraint device in Embodiment 5 of the present application; Figure 17 Shows an exploded schematic diagram of the switching control part of the restraint device in Embodiment 5 of the present application; Figure 18 Shows a schematic diagram of the transmission structure of the restraint device in Embodiment 5 of the present application unfolded along a plane Figure 1 ; Figure 19 Shows a schematic diagram of the transmission structure of the restraint device in Embodiment 5 of the present application unfolded along a plane Figure 2 ; Figure 20 Shows a schematic diagram of the transmission structure of the restraint device in Embodiment 5 of the present application unfolded along a plane Figure 3 .

[0021] Explanation of the reference numerals in the figure: X, the first direction; Y, the second direction; Z, the third direction; 1. First restraint strap; 2. Second restraint strap; 3. First locking part; 4. Second locking part; 5. Switch control part; 6. Cam groove; 10. First serrated part; 11. First locking member; 12. First fixing part; 13. First connecting strap; 14. First elastic member; 15. First driving bar; 20. Second serrated part; 21. Second locking member; 22. Second fixing part; 23. Second connecting strap; 24. Second elastic member; 25. Second driving bar; 31. First limiting member; 32. First sliding groove; 33. First hinge shaft; 34. First guiding groove; 41. Second limiting member; 42. Second sliding groove; 43. Second hinge shaft; 44. Second guiding groove; 50. Housing; 51. Moving part; 52. Fixed part; 53. Fixed strap; 54. First guiding shaft; 55. Second guiding shaft; 56. Elastic reset member; 57. Transmission part; 58. Hinge hole; 59. First end; 60. Second end; 61. First inflection point; 62. Second inflection point; 63. Third inflection point; 64. Fourth inflection point; 65. First inflection surface; 66. Second inflection surface; 67. Third inflection surface; 68. Fourth inflection surface; 69. First groove bottom surface; 70. Second groove bottom surface; 71. Second transition step surface; 72. Convex shaft; 73. Convex ear; 74. Vertical groove; 75. Spiral groove; 76. Cam groove bottom; 77. Locking cam; 78. Locking protrusion structure; 79. Transmission ratchet; 80. Transmission saw gear; 81. Helical tooth; 82. Hollow shaft; 83. Cylindrical serration; 84. Mounting hole; 85. Serrated surface; 86. Core shaft; 87. Shaft hole; 88. First step surface; 89. Third sliding groove; 90. Fourth sliding groove. Detailed implementation mode

[0022] To make the objectives, features, and advantages of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present application.

[0023] Embodiment 1: As Figure 1 , Figure 2 and Figure 3As shown in the figure, a restraint device includes a first restraint strap 1, a second restraint strap 2, a first locking part 3, a second locking part 4, and a switching control part 5. The first restraint strap 1 is provided with a first locking member 11, the second restraint strap 2 is provided with a second locking member 21, the first locking part 3 is provided with a first limiting member 31, and the second locking part 4 is provided with a second limiting member 41. The switching control part 5 includes a moving member 51, a fixing member 52, and a transmission member 57. A cam groove 6 transmission structure is formed among the moving member 51, the fixing member 52, and the transmission member 57. When an external force acts on the moving member 51 and the fixing member 52 and they move relatively back and forth once, the first limiting member 31 and / or the second limiting member 41 can be driven to move, so as to switch the locking states of the first locking part 3 and the second locking part 4. The moving member 51 is fixed together with the first locking part 3 and the second locking part 4 and moves synchronously. When the first locking member 11 is in the locking position and the first locking part 3 is in the locking state, the first locking member 11 can be locked by the first limiting member 31 driven by the switching control part 5. When the second locking member 21 is in the locking position and the first locking part 3 is in the locking state, the second locking member 21 can be locked by the second limiting member 41 driven by the switching control part 5. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other in pairs. The first restraint strap 1 and the second restraint strap 2 are arranged along the second direction Y. Therefore, the first locking part 3 and the second locking part 4 are also arranged along the second direction Y.

[0024] The moving member 51 can move linearly back and forth or rotate relative to the fixing member 52. The ratchet can be used to change the back-and-forth movement into a one-way movement. In this way, different locking states can exist at the same position, that is, pulling the switching control part 5 once can make the transmission member 57 rotate or move a certain distance, and this displacement is used to realize the switching of the locking state. If two restraint straps are set, only two states are needed. If four restraint straps are set, four locking states are designed. Similarly, the change of the locking state is realized by the movement or rotation of the transmission member 57. Setting the cam groove 6 can change the relative positions of the moving member 51 and the fixing member 52 to control the locking state, that is, directly driving the first limiting member 31 or the second limiting member 41 through the moving member 51, or moving the first limiting member 31 or the second limiting member 41 through the transmission member 57. Similarly, the ratchet structure can also change the relative positions of the moving member 51 and the fixing member 52. For example, some push-button ballpoint pens use the ratchet structure to change the relative positions of the moving member 51 and the fixing member 52.

[0025] Such as Figure 1 and Figure 2As shown, a fixing belt 53 is provided at the upper end of the fixing member 52. The fixing belt 53 can be tied to other objects so that the fixing member 52 is relatively fixed in a certain position. The moving member 51 and the housing 50 form an integral structure. The first fixing portion and the second fixing portion are provided on the housing 50. The main body of the fixing member 52 is installed inside the moving member 51. A sliding track is provided between the fixing member 52 and the moving member 51 so that the fixing member 52 and the moving member 51 are connected in a relatively slidable manner.

[0026] As Figure 1 and Figure 2 shown, the first restraint belt 1 includes a first fixing portion 12, a first connecting belt 13, and a first elastic member 14. Both ends of the first connecting belt 13 are respectively connected to the first fixing portion 12 and the first elastic member 14. The first connecting belt 13 is provided with a first locking member 11. One end of the first elastic member 14 is fixedly connected to the first locking portion 3. When the first connecting belt 13 is not affected by an external force, the first elastic member 14 can move the first locking member 11 to the first locking portion 3.

[0027] As Figure 1 and Figure 2 shown, the second restraint belt 2 includes a second fixing portion 22, a second connecting belt 23, and a second elastic member 24. Both ends of the second connecting belt 23 are respectively connected to the second fixing portion 22 and the second elastic member 24. The second connecting belt 23 is provided with a second locking member 21. One end of the second elastic member 24 is fixedly connected to the second locking portion 4. When the second connecting belt 23 is not affected by an external force, the second elastic member 24 can move the second locking member 21 to the second locking portion 4.

[0028] As Figure 4 and Figure 5 shown, in an embodiment, the first locking portion 3 is provided with a first sliding groove 32. The first locking member 11 can slide relative to the first locking portion 3 along the first sliding groove 32. The first locking member 11 is provided with a first serrated portion 10. The first serrated portion 10 is provided with triangular reverse teeth so that the first locking member 11 is not locked when moving in the direction of inserting into the first locking portion 3, but the first locking member 11 can be locked by the first limiting member 31 when moving in the direction of pulling out from the first locking portion 3; the second locking portion 4 is provided with a second sliding groove 42. The second locking member 21 can slide relative to the second locking portion 4 along the second sliding groove 42. The second locking member 21 is provided with a second serrated portion 20. The second serrated portion 20 is provided with reverse teeth so that the second locking member 21 is not locked when moving in the direction of inserting into the second locking portion 4, but the second locking member 21 can be locked by the second limiting member 41 when moving in the direction of pulling out from the second locking portion 4.

[0029] As Figure 4 and Figure 5As shown, in one embodiment, the first limiting member 31 is provided with a first hinge shaft 33 and a first guiding groove 34, and the moving member 51 is provided with a first guiding shaft 54. The first hinge shaft 33 is installed on the moving member 51, and the first guiding shaft 54 is located in the first guiding groove 34. When the moving member 51 moves relative to the fixed member 52, the first guiding shaft 54 slides in the first guiding groove 34 to drive the first limiting member 31 to rotate. When the first limiting member 31 rotates to a first angle, the locking portion of the first limiting member 31 can abut against the first serrated portion 10. When the first limiting member 31 rotates to a second angle, the locking portion of the first limiting member 31 separates from the first serrated portion 10. The second limiting member 41 is provided with a second hinge shaft 43 and a second guiding groove 44, and the moving member 51 is provided with a second guiding shaft 55. The second hinge shaft 43 is installed on the moving member 51, and the second guiding shaft 55 is located in the second guiding groove 44. When the moving member 51 moves relative to the fixed member 52, the second guiding shaft 55 slides in the second guiding groove 44 to drive the second limiting member 41 to rotate. When the second limiting member 41 rotates to the first angle, the locking portion of the second limiting member 41 can abut against the second serrated portion 20. When the second limiting member 41 rotates to the second angle, the locking portion of the second limiting member 41 separates from the second serrated portion 20. The axial directions of the first hinge shaft 33 and the second hinge shaft 43 are in the third direction Z. As Figure 4 shown, when the moving member 51 and the fixed member 52 are in the first relative position, the first limiting member 31 rotates to the first angle, the first locking member 11 is locked by the first limiting member 31, the second limiting member 41 rotates to the second angle, and the second locking member 21 is not locked by the second limiting member 41. As Figure 5 shown, when the moving member 51 and the fixed member 52 are in the second relative position, the first limiting member 31 rotates to the second angle, the first locking member 11 is not locked by the first limiting member 31, the second limiting member 41 rotates to the first angle, and the second locking member 21 is locked by the second limiting member 41. In one embodiment, the positions can be interchanged, that is, the first limiting member 31 is provided with a first hinge shaft 33 and a first guiding shaft 54, and the moving member 51 is provided with a first guiding groove 34. The second limiting member 41 is provided with a second hinge shaft 43 and a second guiding shaft 55, and the moving member 51 is provided with a second guiding groove 44.

[0030] As Figure 6 shown, in one embodiment, an elastic reset member 56 is provided between the moving member 51 and the fixed member 52, and the elastic force direction of the elastic reset member 56 is opposite to the pulling force directions of the first connecting belt 13 and the second connecting belt 23.

[0031] As Figure 2 and Figure 6As shown, in one embodiment, the sliding track of the cam groove 6 can be set on the same plane or as a three-dimensional sliding structure. The fixing member 52 is provided with the cam groove 6, and the transmission member 57 is hinged and fixed to the moving member 51. The transmission member 57 is U-shaped. The first end 59 of the transmission member 57 is inserted into the cam groove 6, and the second end 60 of the transmission member 57 is inserted into the hinge hole 56 of the moving member 51, so that when the moving member 51 moves relative to the fixing member 52 along the first direction X, the first end 59 of the transmission member 57 can slide in the cam groove 6. There is a certain frictional force between the second end 60 of the transmission member 57 and the hinge hole 56, so that the transmission member 57 can maintain a certain angle and position when the transmission member 57 is not affected by external forces. In one embodiment, the positions of the cam groove 6 can be interchanged, that is, the moving member 51 is provided with the cam groove 6 and the transmission member 57 is hinged and fixed to the fixing member 52, and the second end 60 of the transmission member 57 is inserted into the hinge hole 56 of the fixing member 52.

[0032] As Figure 6 and Figure 7 shown in one embodiment, the cam groove 6 is provided with a first inflection point 61, a second inflection point 62, a third inflection point 63 and a fourth inflection point 64. More inflection points can be set as needed. The first inflection point 61 and the third inflection point 63 have a certain distance in the first direction X. When the second end 60 of the transmission member 57 moves forward and backward in the first direction X, the first end 59 of the transmission member 57 moves sequentially along the first inflection point 61, the second inflection point 62, the third inflection point 63 and the fourth inflection point 64 in the cam groove 6; that is, when the second end 60 of the transmission member 57 moves forward along the first direction X, the first end 59 of the transmission member 57 reaches the second inflection point 62 from the first inflection point 61; then when the second end 60 of the transmission member 57 moves in the direction opposite to the first direction X, the first end 59 of the transmission member 57 reaches the third inflection point 63 from the second inflection point 62; when the second end 60 of the transmission member 57 moves forward along the first direction X again, the first end 59 of the transmission member 57 reaches the fourth inflection point 64 from the third inflection point 63; then when the second end 60 of the transmission member 57 moves in the direction opposite to the first direction X, the first end 59 of the transmission member 57 returns from the fourth inflection point 64 to the first inflection point 61. In this way, the locking position can be restored by stretching the restraint belt twice.

[0033] As Figure 7As shown, in one embodiment, a first turning surface 65 is provided in the first direction X of the first inflection point 61. When the first end 59 of the transmission member 57 is at the first inflection point 61, the center of the cross-section of the first end 59 can be projected onto the first turning surface 65 along the first direction X, so that when the first end 59 moves in the first direction X, it can abut against the first turning surface 65 and change its moving direction to move along the first turning surface 65 to reach the second inflection point 62; a second turning surface 66 is provided in the direction opposite to the first direction X of the second inflection point 62. When the first end 59 of the transmission member 57 is at the second inflection point 62, the center of the cross-section of the first end 59 can be projected onto the second turning surface 66 along the direction opposite to the first direction X, so that when the first end 59 moves in the direction opposite to the first direction X, it can abut against the second turning surface 66 and move along the second turning surface 66 to reach the third inflection point 63; a third turning surface 67 is provided in the first direction X of the third inflection point 63. When the first end 59 of the transmission member 57 is at the third inflection point 63, the center of the cross-section of the first end 59 can be projected onto the third turning surface 67 along the first direction X, so that when the first end 59 moves in the first direction X, it can abut against the third turning surface 67 and move along the third turning surface 67 to reach the fourth inflection point 64; a fourth turning surface 68 is provided in the direction opposite to the first direction X of the fourth inflection point 64. When the first end 59 of the transmission member 57 is at the fourth inflection point 64, the center of the cross-section of the first end 59 can be projected onto the fourth turning surface 68 along the direction opposite to the first direction X, so that when the first end 59 moves in the direction opposite to the first direction X, it can abut against the fourth turning surface 68 and move along the fourth turning surface 68 to reach the first inflection point 61.

[0034] Embodiment 2: As Figure 8 shown, in one embodiment, a first groove bottom surface 69 is provided between the first inflection point 61 and the second inflection point 62, and a second groove bottom surface 70 is provided between the second inflection point 62 and the third inflection point 63. The second groove bottom surface 70 includes the area where the second inflection point 62 is located. The depth of the first groove bottom surface 69 at the connection position is less than the depth of the second groove bottom surface 70, so that the first groove bottom surface 69 and the second groove bottom surface 70 are connected by a second transition step surface 71. In this way, the second transition step surface 71 is equivalent to the second turning surface 66. The transmission member 57 needs to have a certain elasticity so that the first end 59 can slide closely along the first groove bottom surface 69 and the second groove bottom surface 70. Both the first groove bottom surface 69 and the second groove bottom surface 70 can be designed as a plane, an inclined surface or a curved surface.

[0035] Embodiment 3: As Figure 5 and Figure 9As shown, a first driving bar 15 and a second driving bar 25 can be arranged in a direction opposite to the first direction X of the fixing member 52. A first guiding groove 34 or a first guiding shaft 54 is arranged on the first driving bar 15, and a second guiding groove 44 or a second guiding shaft 55 is arranged on the second driving bar 25. The separate arrangement of the first driving bar 15 and the second driving bar 25 can increase the elastic deformation ability of the first driving bar 15 and the second driving bar 25. If the first driving bar 15 and the second driving bar 25 adopt an integral monolithic structure, the deformation ability is relatively weak. When the first serrated portion 10 and the second serrated portion 20 are respectively inserted into the first locking portion 3 and the second locking portion 4, the resistance is relatively large and the reverse teeth are prone to deformation.

[0036] Embodiment 4: As Figure 10 , Figure 12 , Figure 13 and Figure 14 As shown, in an embodiment, the switching control part 5 in Embodiment 1 can be improved. A cam groove 6 is provided on the transmission part 57 of the switching control part 5, and a convex shaft 72 is provided on the fixing member 52 to match the cam groove 6. The transmission part 57 is hinged and fixed to the moving part 51. The main body of the transmission part 57 is cylindrical, and the main body of the fixing member 52 is designed in a sleeve shape and sleeved outside the transmission part 57. The cam groove 6 is arranged on the cylindrical surface of the transmission part 57 so that the convex shaft 72 moves along the cylindrical surface. When the moving part 51 moves back and forth along the first direction X relative to the fixing member 52, the convex shaft 72 is arranged on the inner wall of the fixing member 52, and the sliding of the convex shaft 72 in the cam groove 6 can drive the transmission part 57 to rotate relative to the moving part 51 and the fixing member 52. Convex ears 73 are provided on both sides of the fixing member 52, and elastic reset parts 56 are provided on the convex ears 73. The elastic reset parts 56 are springs, and the elastic reset parts 56 are respectively abutted against the fixing member 52 and the moving part 51 to realize the reset of the relative position of the moving part 51 relative to the fixing member 52. The moving part 51 is provided with a shaft hole so that the transmission part 57 can be fixed on the shaft hole and rotate relative to the moving part 51.

[0037] In an embodiment, the fixing member 52 of the switching control part 5 is provided with a cam groove 6 and the transmission part 57 is provided with a convex shaft 72 to match the cam groove 6, and the same function can also be achieved.

[0038] As Figure 13 and Figure 14 As shown, in an embodiment, the cam groove 6 includes a vertical groove 74 and a spiral groove 75. There are at least two vertical grooves 74 and spiral grooves 75. The number of vertical grooves 74 and spiral grooves 75 is the same and can only be designed as an even number, so that at least one cycle is completed in one rotation. The vertical groove 74 is higher than the spiral groove 75 at the transition position between the vertical groove 74 and the spiral groove 75, so that a first stepped surface 88 exists in the vertical groove 74. The convex shaft 72 is provided with an elastic member so that the convex shaft 72 can keep abutting against the bottom 76 of the cam groove 6.

[0039] As Figure 15As shown, it is more intuitive to unfold the cam groove 6 on a plane. When the moving part 51 moves relative to the fixed part 52 in the positive direction of the first direction X, the convex shaft 72 enters the vertical groove 74 from the spiral groove 75. When the moving part 51 moves relative to the fixed part 52 in the reverse direction of the first direction X, the convex shaft 72 moves upward along the vertical groove 74 to the top and enters the spiral groove 75. A first stepped surface 88 is provided at this position, so that when the moving part 51 moves relative to the fixed part 52 in the positive direction of the first direction X, the convex shaft 72 moves along the spiral groove 75 under the action of the first stepped surface 88.

[0040] As Figure 10 , Figure 11 and Figure 14 As shown in FIGS., in an embodiment, a locking cam 77 is provided in the opposite direction of the first direction X of the transmission member 57. The locking cam 77 rotates synchronously with the transmission member 57. The locking cam 77 protrudes to one side. When the locking cam 77 rotates to the first angle, it can limit the relative movement of the first locking member 11 in the first direction X. When the locking cam 77 rotates to the second angle, it can limit the relative movement of the second locking member 21 in the first direction X. The first locking member 11 and the second locking member 21 are designed as a serrated structure, and the locking cam 77 can also be provided with a corresponding serrated locking protrusion structure 78 to match the first locking member 11 and the second locking member 21. The serrated locking protrusion structure 78 can achieve the locking function at different positions and has good stability.

[0041] Example 5: As Figure 16 and Figure 17As shown in the figure, the ratchet drive structure is adopted in this embodiment. The switching control unit 5 includes a moving member 51, a fixing member 52, and a transmission member 57. The moving member 51 is integrally formed with the housing 50. The transmission member 57 includes a transmission ratchet wheel 79 and a transmission sawtooth gear 80. The transmission ratchet wheel 79 and the transmission sawtooth gear 80 are coaxially arranged. The transmission ratchet wheel 79 is axially provided with an even number of inclined teeth 81. In the figure, four inclined teeth 81 are taken as an example. The top of the inclined tooth 81 is provided with an inclined spiral surface. A locking cam 77 is provided in the opposite direction of the first direction X of the transmission member 57. The locking cam 77 is provided with a serrated locking protrusion structure 78. The number of the serrated locking protrusion structures 78 is the same as the number of the inclined teeth 81. The locking cam 77 is provided with a hollow shaft 82. A third chute 89 is arranged in the hollow shaft 82 to match with the transmission ratchet wheel 79 so that the transmission ratchet wheel 79 can move back and forth relative to the locking cam 77 along the first direction X and the transmission ratchet wheel 79 and the locking cam 77 can rotate synchronously. The transmission sawtooth gear 80 is axially provided with a plurality of cylindrical sawteeth 83 to match with the inclined teeth 81. The moving member 51 is provided with a mounting hole 84. The transmission member 57 is arranged in the mounting hole 84. A fourth chute 90 is arranged in the mounting hole 84 so that the transmission sawtooth gear 80 can move axially along the fourth chute 90. An elastic reset member 56 is arranged in the mounting hole 84 to ensure that the transmission sawtooth gear 80 can reset in the opposite direction of the first direction X. The mounting hole 84 is a stepped hole. A sawtooth surface 85 is arranged at the stepped position to match with the inclined teeth 81. The sawtooth surface 85 is staggered with the sawteeth of the transmission sawtooth gear 80 by a certain angle. The fixing member 52 is provided with a core shaft 86. The transmission member 57 is sleeved on the core shaft 86 and installed in the mounting hole 84. The first locking member 11 and the second locking member 21 are designed into a sawtooth structure. The locking cam 77 locks the first locking member 11 or the second locking member 21 through the serrated locking protrusion structure 78.

[0042] As Figure 18 shown, for understanding the transmission mode, the cylindrical surface is unfolded on a plane. The dotted line represents the cylindrical sawteeth 83 of the transmission sawtooth gear 80. The first direction X is upward, and the opposite direction of the first direction X is downward. The upper solid line represents the sawtooth surface 85 of the mounting hole 84, and the lower solid line contour is the inclined tooth 81. At this time, the inclined tooth 81 abuts against the sawtooth surface 85. Without external force, under the action of the elastic reset member 56, the cylindrical sawteeth 83 move downward to abut against the inclined tooth 81. As Figure 19 shown, after the cylindrical sawteeth 83 move downward to abut against the inclined tooth 81, under the external force in the first direction X, the inclined tooth 81 can move along the cylindrical sawteeth 83. In the figure, it moves to the right, and rotation occurs in three-dimensional space. As Figure 20 shown, after the cylindrical sawteeth 83 move upward and retract, the inclined tooth 81 abuts against the sawtooth surface 85 and moves along the sawtooth surface 85. In this way, one retracting and releasing action is completed. After multiple retracting and releasing operations, the inclined tooth 81 can continuously move to the right, that is, continuously rotate in three dimensions. In this way, the locking cam 77 can be driven to rotate and the locking state can be changed.

[0043] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this application can be executed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of this application can be achieved, and no limitations are imposed herein.

[0044] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of this application, "a plurality of" means two or more, unless otherwise specifically defined.

[0045] As described above, the above are only specific embodiments of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art within the technical scope disclosed in this application can easily think of changes or substitutions, which should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

1. A restraint device, characterized in that, It includes a first restraint strap (1), a second restraint strap (2), a first locking part (3), a second locking part (4) and a switching control part (5). The first restraint strap (1) is provided with a first locking member (11), the second restraint strap (2) is provided with a second locking member (21), the first locking part (3) is provided with a first limiting member (31), the second locking part (4) is provided with a second limiting member (41), and the switching control part (5) includes a moving member (51), a fixing member (52) and a transmission member (57). A ratchet transmission structure or a cam groove (6) transmission structure is formed among the moving member (51), the fixing member (52) and the transmission member (57), so that when the moving member (51) and the fixing member (52) move relatively back and forth once, the first limiting member (31) and / or the second limiting member (41) can be driven to move, and the locking states of the first locking part (3) and / or the second locking part (4) are switched.

2. The restraint device according to claim 1, wherein The first locking part (3) is provided with a first sliding groove (32), the first locking member (11) can slide relative to the first locking part (3) along the first sliding groove (32), the first locking member (11) is provided with a first serrated part (10), and the first serrated part (10) is provided with reverse teeth, so that the first locking member (11) is not locked when moving in the direction of inserting into the first locking part (3), but the first locking member (11) can be locked by the first limiting member (31) when moving in the direction of pulling out from the first locking part (3); The second locking part (4) is provided with a second sliding groove (42), the second locking member (21) can slide relative to the second locking part (4) along the second sliding groove (42), the second locking member (21) is provided with a second serrated part (20), and the second serrated part (20) is provided with reverse teeth, so that the second locking member (21) is not locked when moving in the direction of inserting into the second locking part (4), but the second locking member (21) can be locked by the second limiting member (41) when moving in the direction of pulling out from the second locking part (4).

3. The restraint device according to claim 2, wherein The first limiting member (31) is provided with a first hinge shaft (33) and a first guiding shaft (54), and the moving member (51) is provided with a first guiding groove (34); Or, the first limiting member (31) is provided with a first hinge shaft (33) and a first guiding groove (34), and the moving member (51) is provided with a first guiding shaft (54); The first hinge shaft (33) is installed on the moving member (51), and the first guide shaft (54) is located in the first guide groove (34). When the moving member (51) moves relative to the fixed member (52), the first guide shaft (54) slides in the first guide groove (34) to drive the first limiting member (31) to rotate. When the first limiting member (31) rotates to a first angle, the locking portion of the first limiting member (31) can abut against the first serrated portion (10). When the first limiting member (31) rotates to a second angle, the locking portion of the first limiting member (31) separates from the first serrated portion (10). The second limiting member (41) is provided with a second hinge shaft (43) and a second guide shaft (55), and the moving member (51) is provided with a second guide groove (44), or the second limiting member (41) is provided with a second hinge shaft (43) and a second guide groove (44), and the moving member (51) is provided with a second guide shaft (55). The second hinge shaft (43) is installed on the moving member (51), and the second guide shaft (55) is located in the second guide groove (44). When the moving member (51) moves relative to the fixed member (52), the second guide shaft (55) slides in the second guide groove (44) to drive the second limiting member (41) to rotate. When the second limiting member (41) rotates to a second angle, the locking portion of the second limiting member (41) can abut against the second serrated portion (20). When the second limiting member (41) rotates to a second angle, the locking portion of the second limiting member (41) separates from the second serrated portion (20).

4. The restraint device according to claim 3, characterized in that, An elastic reset member (56) is provided between the moving member (51) and the fixed member (52), and the elastic force direction of the elastic reset member (56) is opposite to the pulling force directions of the first restraint belt (1) and the second restraint belt (2).

5. The restraint device according to any one of claims 1-4, characterized in that, The moving member (51) is provided with the cam groove (6), and the transmission member (57) is hinged and fixed to the fixed member (52), or the fixed member (52) is provided with the cam groove (6), and the transmission member (57) is hinged and fixed to the moving member (51). The transmission member (57) is U-shaped. The first end (59) of the transmission member (57) is inserted into the cam groove (6), and the second end (60) of the transmission member (57) is inserted into the hinge hole (56) of the moving member (51) or the fixed member (52). When the moving member (51) moves relative to the fixed member (52) in a first direction, the first end (59) of the transmission member (57) can slide in the cam groove (6).

6. The restraint device according to claim 5, wherein, The cam groove (6) is provided with a first inflection point (61), a second inflection point (62), a third inflection point (63) and a fourth inflection point (64). The first inflection point (61) and the third inflection point (63) have a certain distance in the first direction. When the second end (60) of the transmission member (57) moves forward and backward in the first direction, the first end (59) of the transmission member (57) moves sequentially along the first inflection point (61), the second inflection point (62), the third inflection point (63) and the fourth inflection point (64) in the cam groove (6). That is, when the second end (60) of the transmission member (57) moves forward in the first direction, the first end (59) of the transmission member (57) reaches the second inflection point (62) from the first inflection point (61). After that, when the second end (60) of the transmission member (57) moves in the direction opposite to the first direction, the first end (59) of the transmission member (57) reaches the third inflection point (63) from the second inflection point (62). When the second end (60) of the transmission member (57) moves forward in the first direction again, the first end (59) of the transmission member (57) reaches the fourth inflection point (64) from the third inflection point (63). After that, when the second end (60) of the transmission member (57) moves in the direction opposite to the first direction, the first end (59) of the transmission member (57) returns from the fourth inflection point (64) to the first inflection point (61).

7. The restraint device according to claim 6, characterized in that, A first turning surface (65) is provided in the first direction of the first inflection point (61). When the first end (59) of the transmission member (57) is at the first inflection point (61), the center of the cross-section of the first end (59) can be projected onto the first turning surface (65) in the first direction, so that when the first end (59) moves in the first direction, it can abut against the first turning surface (65) and move along the first turning surface (65) to reach the second inflection point (62); A second turning surface (66) is provided in the direction opposite to the first direction of the second inflection point (62). When the first end (59) of the transmission member (57) is at the second inflection point (62), the center of the cross-section of the first end (59) can be projected onto the second turning surface (66) in the direction opposite to the first direction, so that when the first end (59) moves in the direction opposite to the first direction, it can abut against the second turning surface (66) and move along the second turning surface (66) to reach the third inflection point (63); A third turning surface (67) is provided in the first direction of the third inflection point (63). When the first end (59) of the transmission member (57) is at the third inflection point (63), the center of the cross-section of the first end (59) can be projected onto the third turning surface (67) in the first direction, so that when the first end (59) moves in the first direction, it can abut against the third turning surface (67) and move along the third turning surface (67) to reach the fourth inflection point (64); A fourth turning surface (68) is provided in the direction opposite to the first direction of the fourth inflection point (64). When the first end (59) of the transmission member (57) is at the fourth inflection point (64), the center of the cross-section of the first end (59) can be projected onto the fourth turning surface (68) in the direction opposite to the first direction, so that when the first end (59) moves in the direction opposite to the first direction, it can abut against the fourth turning surface (68) and move along the fourth turning surface (68) to reach the first inflection point (61).

8. The restraint device according to any one of claims 1-4, characterized in that, The fixing member (52) is provided with the cam groove (6) and the transmission member (57) is provided with a convex shaft (72) that matches the cam groove (6), or the transmission member (57) is provided with the cam groove (6) and the fixing member (52) is provided with a convex shaft (72) that matches the cam groove (6). The transmission member (57) is hinged and fixed to the moving member (51). The cam groove (6) is arranged on the cylindrical surface so that the convex shaft (72) moves along the cylindrical surface. When the moving member (51) moves back and forth in the first direction relative to the fixing member (52), the sliding of the convex shaft (72) in the cam groove (6) can drive the transmission member (57) to rotate relative to the moving member (51).

9. The restraint device according to claim 8, wherein The cam groove (6) includes a vertical groove (74) and a spiral groove (75). There are at least two of the vertical groove (74) and the spiral groove (75). At the transition position between the vertical groove (74) and the spiral groove (75), the vertical groove (74) is higher than the spiral groove (75) such that there is a stepped surface in the vertical groove (74). The convex shaft (72) is provided with an elastic member so that the convex shaft (72) can maintain contact with the bottom (76) of the cam groove.

10. The restraint device according to claim 9, wherein The transmission member (57) is provided with a locking cam (77) in the first direction. When the locking cam (77) rotates to the first angle, it can limit the relative movement of the first locking member (11) in the first direction. When the locking cam (77) rotates to the second angle, it can limit the relative movement of the second locking member (21) in the first direction.

Images