Headrest adjustment mechanism and child safety seat

Abstract

The present invention discloses a headrest adjustment mechanism and a child safety seat, which relate to the technical field of safety seats and include: a sliding member slidably arranged on the headrest; a safety pin slidably connected to a through groove on the sliding member; a trigger rod slidably arranged on the headrest, the trigger rod having a wedge-shaped portion; a guide member fixedly connected to the safety pin, the guide member having a right-angled triangle-shaped guide groove; a sliding column fixedly connected to the trigger rod, the sliding column and the guide groove slidingly cooperate; the elastic force of a first elastic member causes the wedge-shaped portion of the trigger rod to abut against the sliding member; the elastic force of a second elastic member causes the second friction surface of the sliding member to abut against the first friction surface; and the elastic force of a third elastic member causes the safety pin to be inserted into the safety groove or abut against the notch edge of the safety groove. The present invention can steplessly adjust the height of the headrest and can further lock the headrest and the chair body in the event of an emergency such as a vehicle collision to compensate for the defect of insufficient locking force of the stepless adjustment.

Description

Technical Field

[0001] The present invention relates to the technical field of safety seats, in particular to a headrest adjustment mechanism and a child safety seat. Background Art

[0002] Child safety seats are secured to motor vehicles using a locking mechanism installed on the vehicle itself. This restricts the child's body movement to reduce injuries from collisions, sudden deceleration, and other unexpected events. In addition to the main seat, a child safety seat also includes a headrest that effectively protects the child's head while also ensuring comfort and being adjustable.

[0003] Patent publication number CN216268826U, titled "A Child Safety Seat," includes a base, a seat body connected to the base, and a headrest at the top end of the seat body, which is connected to the seat body via a sliding positioning mechanism. The sliding positioning mechanism includes a positioning plate, a slide plate, a pull rod, and a positioning rod. The positioning plate is connected to the backrest of the seat body, with a plurality of positioning slots on both sides of the back of the positioning plate. The slide plate is located behind the positioning plate. The headrest is connected to the top of the slide plate, with a rectangular hole on the front of the headrest. The slide plate has a slide groove, and the pull rod slides into the slide groove. The pull rod includes a handle, a slider, and a slide rod connecting the handle and slider. The handle is located in the rectangular hole of the headrest. The slider has a first inclined strip hole on both sides. A short rod slides into the first strip hole, and the short rod is connected to the positioning rod. The outer end of the positioning rod is inserted into the positioning slot. Pulling the pull rod upward drives the positioning rod to move toward each other on the slide plate, disengaging the positioning rod from the positioning slot to adjust the headrest to the appropriate height.

[0004] The patent, publication number CN215154110U, is titled "A headrest adjustment mechanism for a child safety seat and a child safety seat." The headrest adjustment mechanism includes: a seat back with a plurality of gear slots; a headrest slidably arranged on the seat back, with an adjustment assembly provided on the headrest; the adjustment assembly includes an adjustment member and a locking member for locking the headrest to the seat back, the locking member being movably arranged in the gear slots, and the adjustment member can drive the locking member out of the gear slots to unlock the headrest from the seat back. The advantages of this utility model are that the headrest can slide up and down relative to the seat back to adjust the height of the safety seat headrest; through the cooperation of the locking member and the gear slots, the headrest can be adjusted and fixed in multiple gears, with strong versatility and high stability; and a belt winding shaft is provided on the seat back to reduce the force on the headrest and improve the safety of the safety seat.

[0005] In the prior art such as the above-mentioned patent, the height of the headrest is usually adjusted by gear adjustment. When the headrest switches between adjacent gears, the height difference of the headrest is relatively large, which is not conducive to the riding comfort of children. Summary of the Invention

[0006] The object of the present invention is to provide a headrest adjustment mechanism and a child safety seat to address the deficiencies in the above-mentioned prior art.

[0007] In order to achieve the above-mentioned objectives, the present invention provides the following technical solutions: a headrest adjustment mechanism for a child safety seat, the child safety seat comprising a seat body and a headrest slidably arranged on a backrest of the seat body, the backrest being provided with a first friction surface and a plurality of safety grooves arranged in parallel, comprising: a sliding member slidably arranged on the headrest, the side of the sliding member away from the headrest being a second friction surface; a safety pin slidably connected in a through groove on the sliding member; a trigger rod slidably arranged on the headrest, the trigger rod having a wedge-shaped portion; a guide member fixedly connected to the safety pin, the guide member being provided with a guide groove in the shape of a right triangle; a sliding column fixedly connected to the trigger rod, the sliding column slidingly cooperating with the guide groove; a first elastic member, whose elastic force causes the wedge-shaped portion of the trigger rod to abut against the sliding member; a second elastic member, whose elastic force causes the second friction surface of the sliding member to abut against the first friction surface; a third elastic member, whose elastic force causes the safety pin to be inserted into the safety groove or abut against the edge of the notch of the safety groove.

[0008] Furthermore, a receiving groove is provided on the safety pin, a sliding part is slidably connected in the receiving groove, a clamping block and a wedge block are spaced apart on the sliding part, a spring is provided between the bottom of the receiving groove and the sliding part, and the process of the spring restoring the deformation drives the clamping block and the wedge block to protrude from the receiving groove, a clamping groove is provided at the bottom of the safety groove, and an avoidance groove for avoiding the wedge block is provided at the bottom of the safety groove; in the process of the safety pin sliding until it is completely received in the through groove, the wedge block is driven to slide and abut against the mouth of the through groove so that the clamping block and the wedge block are received in the receiving groove.

[0009] Furthermore, a rotating shaft is rotatably connected to the headrest, and the rotating shaft is slidably connected to the backrest of the chair body through a slider. A plurality of gear slots are provided on the rotating shaft along the circumferential direction, and a gear rod is fixedly connected to the trigger rod, and the gear rod is plugged into the gear slot.

[0010] Furthermore, the first elastic member includes a first compression spring, which is arranged in a spring groove on the trigger rod, one end of the first compression spring is connected to the trigger rod, and the other end is connected to the headrest.

[0011] Furthermore, the second elastic member includes at least one second compression spring, one end of the second compression spring is connected to the sliding member, and the other end is connected to the headrest.

[0012] Furthermore, there are two safety pins, which are relatively slidably arranged on the sliding member. The third elastic member includes a third compression spring, which is arranged between the two safety pins. Both ends of the third compression spring are connected to the safety pins.

[0013] Furthermore, a handle is provided on one end of the trigger rod away from the wedge-shaped portion, and a groove for accommodating the handle is provided on the headrest.

[0014] Furthermore, a notch is provided in the middle of the sliding member, the trigger rod is located in the notch, and the inclined surface of the wedge-shaped portion is in sliding contact and abutment with the side wall of the notch.

[0015] Furthermore, both the first friction surface and the second friction surface are provided with transverse grooves.

[0016] The present invention also provides a child safety seat, comprising a seat body, wherein the backrest of the seat body is provided with the headrest adjustment mechanism.

[0017] In the above technical solution, the present invention provides a headrest adjustment mechanism, which can steplessly adjust the height of the headrest through the cooperation between the trigger rod, the sliding member, the sliding column, the guide member, the first elastic member and the second elastic member, so that the headrest can be adjusted to the most appropriate position; and, through the cooperation between the trigger rod, the sliding member, the safety pin, the safety groove and the third elastic member, the headrest and the chair body can be further locked in the event of an emergency such as a vehicle collision, so as to compensate for the defect of insufficient locking force of the stepless adjustment, so that the headrest and the chair body become a stable whole, thereby providing sufficient protection for children. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0019] Figure 1 A schematic structural diagram of a headrest and a headrest adjustment mechanism provided in an embodiment of the present invention;

[0020] Figure 2 The embodiment of the present invention provides Figure 1 A magnified view of the structure in the circle;

[0021] Figure 3 The embodiment of the present invention provides Figure 2 A magnified view of the structure in the circle;

[0022] Figure 4 A schematic structural diagram of a headrest adjustment mechanism provided in an embodiment of the present invention;

[0023] Figure 5 The embodiment of the present invention provides Figure 4 A magnified view of the local structure;

[0024] Figure 6 A schematic structural diagram of a chair body, a first friction surface, and a safety groove provided by an embodiment of the present invention;

[0025] Figure 7 The embodiment of the present invention provides Figure 6 A magnified view of the structure in the circle;

[0026] Figure 8 This is a schematic structural diagram of a child safety seat provided by an embodiment of the present invention.

[0027] Description of reference numerals:

[0028] 100. Headrest; 200. Chair body; 101. First friction surface; 102. Safety groove; 103. Sliding member; 104. Second friction surface; 105. Safety pin; 106. Trigger lever; 107. Wedge-shaped portion; 108. Guide member; 109. Guide groove; 110. Sliding column; 111. First elastic member; 112. Second elastic member; 113. Third elastic member; 114. Sliding portion; 115. Snap-fit ​​block; 116. Wedge-shaped block; 117. Spring; 118. Slot; 119. Rotating shaft; 120. Sliding block; 121. Shift slot; 123. Shift lever; 124. Handle. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0030] See also Figure 1-8The embodiment of the present invention provides a headrest 100 adjustment mechanism for a child safety seat. The child safety seat includes a seat body 200. A slide groove is provided on the backrest of the seat body 200. A sliding edge is provided on the headrest 100. The headrest 100 is slidably arranged on the backrest through the sliding cooperation between the sliding edge and the slide groove. The backrest is provided with a first friction surface 101 and a plurality of safety grooves 102 arranged in parallel. The headrest 100 adjustment mechanism includes: a sliding member 103, a safety pin 105, a trigger rod 106, a guide member 108, and a sliding column. 110, a first elastic member 111, a second elastic member 112 and a third elastic member 113, wherein the sliding member 103 is slidably arranged on the headrest 100, and the sliding direction is the thickness direction of the backrest. The side of the sliding member 103 away from the headrest 100 is the second friction surface 104, and the second friction surface 104 can be abutted with the first friction surface 101. The safety pin 105 is slidably connected to the through groove on the sliding member 103, and the sliding direction is the width direction of the backrest. The trigger rod 106 is slidably arranged on the headrest 100, and the sliding The direction is the height direction of the headrest 100, the trigger rod 106 has a wedge-shaped portion 107, the middle of the sliding member 103 is provided with a notch, the trigger rod 106 is located in the notch, the inclined surface of the wedge-shaped portion 107 slides and abuts against the side wall of the notch, the trigger rod 106 is provided with a handle 124 on the end away from the wedge-shaped portion 107, the headrest 100 is provided with a groove for accommodating the handle 124, or the trigger rod 106 is driven by an electric telescopic rod or a hydraulic cylinder, the guide member 108 is fixedly connected to the safety pin 105, and the guide member 108 is fixedly connected to the safety pin 105. A right-angled triangle guide groove 109 is provided on 8, and a slide column 110 is fixedly connected to the trigger rod 106. The slide column 110 slides in cooperation with the guide groove 109. The elastic force of the first elastic member 111 causes the wedge-shaped portion 107 of the trigger rod 106 to abut against the sliding member 103. The elastic force of the second elastic member 112 causes the second friction surface 104 of the sliding member 103 to abut against the first friction surface 101. The elastic force of the third elastic member 113 causes the safety pin 105 to be inserted into the safety groove 102 or abut against the edge of the notch of the safety groove 102.

[0031] In the above technical solution, the present invention provides a headrest 100 adjustment mechanism. When not adjusted, the elastic force of the first elastic member 111 prevents the wedge-shaped portion 107 of the trigger rod 106 from squeezing the sliding member 103, and the elastic force of the second elastic member 112 causes the second friction surface 104 of the sliding member 103 to tightly abut against the first friction surface 101 of the backrest. Both the first friction surface 101 and the second friction surface 104 are provided with transverse grooves. The friction force generated between the second friction surface 104 and the first friction surface 101 locks the sliding member 103 on the backrest, thereby locking the headrest 100 relative to the backrest; and the elastic force of the third elastic member 113 causes the safety pin 105 to be inserted into the safety groove 102 or abut against the notch edge of the safety groove 102. If the safety pin 105 is not aligned with the safety groove 102 at this time, the safety pin 105 abuts At the notch edge of the safety groove 102, once an emergency such as a vehicle collision occurs, the locking force between the sliding member 103 and the backrest is insufficient to lock the headrest 100, which will cause the headrest 100 to slide a short distance relative to the backrest until the safety pin 105 is aligned with the adjacent safety groove 102. The elastic force of the third elastic member 113 causes the safety pin 105 to instantly insert into the aligned safety groove 102, further locking the headrest 100 and the chair body 200 to compensate for the defect of insufficient locking force of the stepless adjustment, making the headrest 100 and the chair body 200 a stable whole, which fully protects the child; if the safety pin 105 is aligned with the safety groove 102 at this time, the safety pin 105 is directly inserted into the safety groove 102, and the headrest 100 can be locked relative to the backrest in the event of a vehicle collision. During adjustment, the trigger rod 106 is pulled upward by the handle 124 to overcome the elastic force of the first elastic member 111, and the wedge-shaped portion 107 of the trigger rod 106 squeezes the sliding member 103, so that the second friction surface 104 of the sliding member 103 is separated from the first friction surface 101 on the backrest. At the same time, the upward movement of the trigger rod 106 also drives the slide column 110 to move together, and the slide column 110 slides in contact with the oblique side wall of the right-angled triangle guide groove 109, thereby causing the guide member 108 to move horizontally, and the guide member 108 drives the safety pin 105 to move together until the safety pin 105 is in a closed position. The pin 105 is completely withdrawn from the safety groove 102, and the height of the head can be adjusted at this time. After the headrest 100 is adjusted to the appropriate position, the handle 124 can be directly released. The elastic force of the first elastic member 111 causes the wedge-shaped portion 107 to slide away from the sliding member 103, and the elastic force of the second elastic member 112 causes the second friction surface 104 of the sliding member 103 to abut against the first friction surface 101, thereby locking the headrest 100 and the backrest. The elastic force of the third elastic member 113 causes the safety pin 105 to be inserted into the safety groove 102 or abut against the edge of the notch of the safety groove 102.

[0032] As a preferred technical solution of the present invention, a receiving groove is provided on the safety pin 105, and a sliding portion 114 is slidably connected in the receiving groove. A clamping block 115 and a wedge block 116 are provided on the sliding portion 114 at intervals. A spring 117 is provided between the bottom of the receiving groove and the sliding portion 114. The spring 117 restores the deformation process to drive the clamping block 115 and the wedge block 116 to protrude from the receiving groove. The bottom of the safety groove 102 is provided with a spring that can be clamped with the clamping block 115. The engaging slot 118 has a width not less than the sum of the widths of the engaging block 115 and the wedge block 116. The width direction here is the sliding direction of the safety pin 105. The bottom of the safety slot 102 is provided with an avoidance slot for avoiding the wedge block 116. When the safety pin 105 slides until it is completely received in the through slot, the wedge block 116 is driven to slide and abut against the mouth of the through slot to enable the engaging block 115 and the wedge block 116 to be received in the receiving slot. When the safety pin 105 is not aligned with the safety groove 102 and abuts the edge of the groove 102, the cooperation between the wedge block 116 and the through-slot portion makes the wedge block 116 and the clamping block 115 also accommodated in the accommodation groove. When the safety pin 105 is aligned with and inserted into the safety groove 102, since the safety pin 105 slides out of the through-slot, the through-slot portion no longer restricts the wedge block 116, and the elastic force of the spring 117 causes the sliding portion 114 to slide into the accommodation groove, that is, when the wedge block 116 and the clamping block 115 slide out of the accommodation, the clamping block 115 enters the clamping groove 118. In this way, even if a severe situation such as local deformation of the safety seat occurs due to a vehicle collision, the safety pin 105 will not be pulled out of the safety groove 102, because the clamping cooperation between the clamping block 115 and the clamping groove 118 restricts the safety pin 105 from sliding out of the safety groove 102.

[0033] As a preferred technical solution of the present invention, the first elastic member 111 includes a first compression spring, which is disposed in a spring 117 groove on the trigger rod 106. One end of the first compression spring is connected to the trigger rod 106, and the other end is connected to the headrest 100. The second elastic member 112 includes at least one second compression spring, one end of which is connected to the sliding member 103, and the other end is connected to the headrest 100. The third elastic member 113 includes a third compression spring, one end of which is connected to the sliding member 103, and the other end is connected to the safety pin 105. Alternatively, there are two safety pins 105, which are relatively slidably disposed on the sliding member 103. The third elastic member 113 includes a third compression spring, which is disposed between the two safety pins 105, and each end of the third compression spring is connected to a safety pin 105.

[0034] In another embodiment provided by the present invention, a rotating shaft 119 is rotatably connected to the headrest 100, and the rotating shaft 119 is slidably connected to the backrest of the chair body 200 through a slider 120. A plurality of gear grooves 121 are provided on the rotating shaft 119 along the circumferential direction, and a gear rod 123 is fixedly connected to the trigger rod 106, and the gear rod 123 is plugged into and matched with the gear groove 121; this embodiment requires that the sliding edge on the headrest 100 has the freedom to move relative to the slide groove on the backrest along the depth direction of the slide groove, the sliding edge cannot be separated from the slide groove, and the structure of the gear rod 123 and the gear groove 121 has strong strength. In the above technical solution, by sliding the trigger rod 106 upward with the handle 124, the gear lever 123 can slide out of the gear slot 121, so that the angle of the headrest 100 relative to the backrest can be adjusted within a smaller angle range, thereby improving the comfort of the headrest 100. Within the angle adjustment range of the headrest 100, the second friction surface 104 of the sliding member 103 can still abut and cooperate with the second friction surface 104, and the safety pin 105 can still be plugged and cooperated with the safety slot 102.

[0035] A child safety seat comprises a seat body 200, wherein the backrest of the seat body 200 is provided with the above-mentioned headrest 100 adjustment mechanism. The child safety seat has all the technical effects of the headrest 100 adjustment mechanism.

[0036] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A headrest adjustment mechanism for a child safety seat, the child safety seat comprising a seat body and a headrest slidably mounted on a backrest of the seat body, the backrest being provided with a first friction surface and a plurality of safety grooves arranged in parallel, characterized in that: include: a sliding member, which is slidably arranged on the headrest, wherein a side of the sliding member away from the headrest serves as a second friction surface; a safety pin slidably connected to a through slot on the sliding member; a trigger lever, which is slidably disposed on the headrest, and has a wedge-shaped portion; A guide piece is fixedly connected to the safety pin and is provided with a guide groove in the shape of a right triangle; A slide column is fixedly connected to the trigger rod and is in sliding engagement with the guide groove; a first elastic member, whose elastic force causes the wedge-shaped portion of the trigger lever to abut against the sliding member; a second elastic member, the elastic force of which causes the second friction surface of the sliding member to abut against the first friction surface; The elastic force of the third elastic member causes the safety pin to be inserted into the safety groove or to abut against the edge of the groove of the safety groove.

2. The headrest adjustment mechanism according to claim 1, characterized in that: The safety pin is provided with a receiving groove, a sliding part is slidably connected in the receiving groove, a clamping block and a wedge block are spaced apart on the sliding part, a spring is provided between the bottom of the receiving groove and the sliding part, and the process of the spring restoring the deformation drives the clamping block and the wedge block to protrude from the receiving groove, a clamping groove is provided at the bottom of the safety groove, and an avoidance groove for avoiding the wedge block is provided at the bottom of the safety groove; in the process of the safety pin sliding until it is completely received in the through groove, the wedge block is driven to slide and abut against the mouth of the through groove so that the clamping block and the wedge block are received in the receiving groove.

3. The headrest adjustment mechanism according to claim 1, characterized in that: The headrest is rotatably connected to a rotating shaft, which is slidably connected to the backrest of the chair body through a slider. A plurality of gear slots are provided on the rotating shaft along the circumferential direction. A gear lever is fixedly connected to the trigger rod, and the gear lever is plugged into the gear slot.

4. The headrest adjustment mechanism according to claim 1, characterized in that: The first elastic member includes a first compression spring, which is arranged in a spring slot on the trigger rod. One end of the first compression spring is connected to the trigger rod, and the other end is connected to the headrest.

5. The headrest adjustment mechanism according to claim 1, characterized in that: The second elastic member includes at least one second compression spring, one end of the second compression spring is connected to the sliding member, and the other end is connected to the headrest.

6. The headrest adjustment mechanism according to claim 1, characterized in that: There are two safety pins, which are relatively slidably arranged on the sliding member. The third elastic member includes a third compression spring, which is arranged between the two safety pins. Both ends of the third compression spring are connected to the safety pins.

7. The headrest adjustment mechanism according to claim 1, characterized in that: A handle is provided on one end of the trigger rod away from the wedge-shaped portion, and a groove for accommodating the handle is provided on the headrest.

8. The headrest adjustment mechanism according to claim 1, characterized in that: A notch is provided in the middle of the sliding member, the trigger rod is located in the notch, and the inclined surface of the wedge-shaped portion is in sliding contact with the side wall of the notch.

9. The headrest adjustment mechanism according to claim 1, characterized in that: Both the first friction surface and the second friction surface are provided with transverse grooves.

10. A child safety seat, comprising a seat body, a headrest adjustment mechanism provided on the backrest of the seat body, characterized in that: The headrest adjustment mechanism is the headrest adjustment mechanism according to any one of claims 1 to 9.

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