Anti-jump gear device, seat footrest device with anti-jump gear device, and child safety seat

Abstract

An anti-jump device includes: a fixed seat, symmetrically separated on both sides, having a slide rail extending in the longitudinal direction, and two side walls facing each other in a transverse direction perpendicular to the longitudinal direction; an extension piece, movably inserted into the fixed seat and able to slide along the slide rail, thereby moving between an extended position and a retracted position relative to the fixed seat; a locking piece, used to connect the fixed seat and the extension piece, thereby locking the position of the extension piece relative to the fixed seat; and a cross bar, arranged between the two side walls, used to prevent the two side walls from displacing laterally with each other.

Description

Technical Field

[0001] The present application relates to an anti-jump gear device, and a seat footrest device and a child safety seat having the anti-jump gear device. Background Art

[0002] Child safety seats are commonly used in cars to protect children in the event of a collision. In some applications, the child seat has a footrest underneath for the child to rest their feet. The footrest can be extendable, meaning it can extend from or retract into the seat's lower portion.

[0003] In such extendable footrests, a securing device is required to secure the footrest in either the extended or retracted position. It has been found that in some applications, the footrest may escape the restraint of the securing device upon impact, thereby accidentally disengaging from the extended position (i.e., skipping). Therefore, it is desirable to provide an anti-skipping device that can prevent such a skipping situation. Summary of the Invention

[0004] According to the present application, an anti-jump device includes: a fixed seat, symmetrically separated on both sides, having a sliding rail extending along the longitudinal direction, and two side walls facing each other along a transverse direction perpendicular to the longitudinal direction; an extension piece, movably inserted on the fixed seat, and able to slide along the sliding rail, thereby moving between an extended position and a retracted position relative to the fixed seat; a locking piece, used to connect the fixed seat and the extension piece, thereby locking the position of the extension piece relative to the fixed seat; and a cross bar, arranged between the two side walls, used to prevent the two side walls from displacing laterally with each other.

[0005] In one embodiment, both ends of the crossbar are respectively passed through the outer sides of the two side walls and are fastened to the two side walls at the outer sides by fixed stoppers to prevent the two side walls from lateral displacement away from each other.

[0006] In one embodiment, the cross bar is provided on one side of the extension member at a position that does not interfere with a movement path of the extension member.

[0007] In one embodiment, the anti-jump device also includes a shell, which is fixed to the extension piece and is located between the cross bar and the extension piece; the fixing seat is provided with at least two groups of slots on the opposite surfaces of the two side walls; the two sides of the shell have plug slots that match the slots; when the slot is aligned with the plug slot, the locking piece is inserted into both the slot and the plug slot to fix the position of the extension piece relative to the fixing seat.

[0008] In one embodiment, the locking member is located on the side of the extension member facing the cross bar, and has a handle and two symmetrically arranged arms, the two arms respectively extending from the handle toward the two side walls of the fixing base, and the ends of the two arms are respectively provided with plugs, when the slot is aligned with the plug slot, the plug can be inserted into both the slot and the plug slot.

[0009] In one embodiment, the handle is located in the transverse middle of the extension member, and the two arms are arc-shaped parts extending from the transverse middle of the handle toward the two side walls in an approximately quarter-circle arc.

[0010] In one embodiment, the arm is a rigid arm; the slot includes a longitudinal portion and a vertical portion, the longitudinal portion and the vertical portion are respectively substantially linear and intersect each other at an intersection point; the plug has a shape corresponding to the slot, so that it can be smoothly inserted into the slot and form a shape fit with the slot.

[0011] In one embodiment, one of the at least two groups of slots corresponds to the extended position of the extension member, and another of the at least two groups of slots corresponds to the retracted position of the extension member.

[0012] In one embodiment, two slideways are formed in the shell and extend toward the two side walls in an approximately quarter-circle arc, respectively, for accommodating the two arms, thereby defining the movement trajectories of the two arms.

[0013] In one embodiment, when the extension member is in the extended position or the retracted position, the arm of the locking member extends from the slide and is inserted into the slot and the plug slot; under external force, the arm of the locking member can be retracted into the slide and disengaged from the slot and the plug slot, so that the extension member can slide along the longitudinal direction relative to the fixed base.

[0014] In one embodiment, an elastic member is provided between the locking member and the housing, and the elastic member applies a restoring force to the locking member so that the two arms of the locking member remain in a state of extending from the slideway.

[0015] In one embodiment, the cross bar is arranged at approximately the first third of the longitudinal length of the side wall; the diameter of the cross bar is approximately one tenth of the length of the vertical edge of the side wall; the length of the portion of the cross bar located between the two side walls is greater than the length of the portion of the cross bar inserted inside each of the side walls.

[0016] According to the present application, a seat footrest device includes: a foot pedal; and the anti-jump device according to the present application, wherein the foot pedal is covered on an extension piece of the anti-jump device.

[0017] In one embodiment, the handle of the locking member of the anti-jump device is exposed on a side of the foot pedal facing the cross bar.

[0018] According to the present application, a child safety seat comprises: a seat portion; and a seat footrest device according to the present application; wherein, the foot pedal of the seat footrest device and the anti-jump stop device are respectively located below the seat portion, and the fixing seat of the anti-jump stop device is fixed to the bottom side of the seat portion, the longitudinal direction is the front-to-back direction of the seat portion, and the transverse direction is the left-to-right direction of the seat portion; when the extension member is located at the extended position, the foot pedal extends from the bottom side of the seat portion to the front of the seat portion; when the extension member is located at the retracted position, the foot pedal is at least partially located below the bottom side of the seat portion; the handle of the locking member of the anti-jump stop device is exposed below the foot pedal. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The embodiments of the present application will be described in detail below with reference to the accompanying drawings, in which:

[0020] Figure 1 is a perspective view of a child safety seat according to the present application;

[0021] Figure 2 is a perspective view of the child safety seat according to the present application from another angle;

[0022] Figure 3A is a perspective view of the child safety seat according to the present application from another angle, showing an anti-jump device; Figure 3B yes Figure 3A A partial enlarged view of

[0023] Figure 4A The child safety seat according to the present application is shown, wherein the housing of the anti-jump device is removed to more clearly show its internal structure; Figure 4B yes Figure 4A A partial enlarged view of

[0024] Figure 5A The child safety seat according to the present application is shown, wherein the housing and extension of the anti-jump device are removed to more clearly show the internal structure thereof; Figure 5B yes Figure 5A A partial enlarged view of

[0025] Figure 6 A child safety seat according to the present application is shown, wherein a slide in the housing of the anti-jump device is shown;

[0026] Figure 7 An extension member of a child safety seat according to the present application is shown;

[0027] Figure 8 The locking member of the child safety seat according to the present application is shown;

[0028] Figure 9A A bottom perspective view of the child safety seat according to the present application is shown, wherein the fixing base is removed to illustrate the positional relationship between the extension member, the housing, and the plug; Figure 9B yes Figure 9A A partial enlarged view of

[0029] Figure 10A A bottom perspective view of the child safety seat according to the present application is shown from another angle, wherein the plug is shown to be inserted into the side wall through the plug slot in the housing; Figure 10B yes Figure 10A A partial enlarged view of

[0030] Figure 11 The side of the housing according to the present application facing the extension is shown.

[0031] Reference Signs List

[0032] 100 Anti-jump device

[0033] 110 extension

[0034] 111 limit slot

[0035] 112 slide rail accommodation portion

[0036] 120 Locking piece

[0037] 121 handle

[0038] 122 Arm

[0039] 123 plug

[0040] 130 fixed seat

[0041] 131 sidewall

[0042] 132 slots

[0043] 132a vertical portion

[0044] 132b longitudinal portion

[0045] 133 Slide Rail

[0046] 140 crossbar

[0047] 141 stopper

[0048] 150 shell

[0049] 151 Slide

[0050] 152 Plug slot

[0051] 200 Seats

[0052] 300 pedals DETAILED DESCRIPTION

[0053] While the invention has been illustrated and described herein with reference to particular embodiments, the invention is not limited to the details shown, but rather various modifications may be made within the scope and range of equivalents of the claims and without departing from the invention.

[0054] The descriptions of directions such as "front", "back", "up", and "down" involved in this document are only for the convenience of understanding. The present invention is not limited to these directions, but can be adjusted according to actual conditions.

[0055] First refer to Figure 1 、 Figure 2 , in which a child safety seat according to an embodiment of the present application is shown as a whole. As shown in the figure, the child safety seat includes a seat portion 200 and a foot pedal 300, wherein the seat portion 200 is a portion fixed to the car for the child to sit on; the foot pedal 300 is a portion that can extend from the bottom of the seat portion 200 for the child to place his feet. The device that connects the foot pedal 300 to the seat portion 200 is the anti-jump device 100 of the present application. The anti-jump device 100 is used to movably connect the foot pedal 300 to the seat portion 200, and can lock the foot pedal 300 in a plurality of different positions relative to the seat portion 200. These positions can be, for example, an extended position and a retracted position positioned along the front and rear directions of the seat portion 200. For example, in Figure 1 In FIG, the footrest 300 is shown in a retracted position. Figure 2 , the footrest 300 is shown in an extended position.

[0056] During use, the foot pedal 300 may be bumped due to the bumping of the car. One of the functions of the anti-jump gear device 100 of the present application is to prevent the foot pedal 300 from accidentally leaving its locked position when it is bumped.

[0057] For ease of understanding, hereinafter, the front-to-rear direction of the seat is referred to as the longitudinal direction, the left-to-right direction is referred to as the lateral direction, and the up-down direction is referred to as the vertical direction.

[0058] Now refer to Figures 3A-3B The anti-jump device 100 according to the present application is generally described. Figure 3A is a perspective view of the child safety seat according to the present application from another angle, showing the anti-jump device 100; Figure 3B yes Figure 3A A partial enlarged view of .

[0059] As shown in the figure, the anti-jump gear device 100 includes an extension member 110, a locking member 120, a fixing seat 130, a crossbar 140, and a housing 150. The extension member 110 is fixed to the footrest 300 to drive the footrest 300 to move; the fixing seat 130 is fixed to the bottom of the seat portion 200, and the extension member 110 is configured to move longitudinally along the fixing seat 130; the locking member 120 is attached to the middle portion below the extension member 110, and locks and releases the longitudinal movement of the extension member 110 relative to the fixing seat 130; the crossbar 140 is connected between the two side walls 131 of the fixing seat 130; and the housing 150 is snapped into place below the extension member 110 to form a space for accommodating the locking member 120.

[0060] The specific structure of each component of the anti-jump device 100 will now be described.

[0061] First refer to Figures 4A-4B 、 Figure 7 The specific structure of the extension member 110 is described below. As shown in the figure, the extension member 110 is a plate-shaped member that extends roughly in the transverse direction. The front end of the extension member 110 is fixed to the footrest 300 so as to drive the footrest 300 to move together. In other embodiments, the extension member 110 and the footrest 300 can also be formed as one piece. There is a hollow cylindrical member extending in the longitudinal direction on each side of the extension member 110, namely, the slide rail receiving portion 112. In use, the slide rail receiving portion 112 is sleeved on the slide rail 133 of the fixed seat 130 (see Figure 5A , described below), allowing the extension member 110 to slide longitudinally relative to the fixing base 130. A retaining groove 111 is also provided on each side of the extension member 110. The retaining groove 111 is formed on the vertically extending plate-like portion of the extension member 110 and is in the form of a longitudinal linear groove on the rear side of the plate-like portion. During use, the housing 150 partially fits into the retaining groove, thereby retaining the housing 150 and the extension member 110 in position and securing them, ensuring the reliability of the retaining and securing relationship between the housing 150 and the extension member 110.

[0062] Now refer to Figures 4A-4BThe specific structure of the fixing base 130 is described below. As shown in the figure, the fixing base 130 includes two side walls 131, which face each other in the transverse direction and have a certain transverse thickness. The transverse cross-section of each side wall 131 is roughly a right triangle, wherein the long right-angled side is in contact with the bottom side of the seat portion 200, the short right-angled side extends downward from the bottom side of the seat portion 200, and the hypotenuse faces the front and lower side of the seat portion 200. The two side walls 131 of the fixing base 130 can be formed into one piece with a connecting portion (not shown) located therebetween, or they can be fixed to the seat portion 200 independently of each other. In one embodiment, the side walls 131 are hollow to reduce the overall weight.

[0063] The fixing base 130 includes a longitudinally extending slide rail 133 (see Figure 5A ), such as a cylindrical slide rail 133. In the illustrated embodiment, the slide rail 133 extends forward from the front of each side wall 131. In other embodiments, the slide rail 133 may have a different cross-sectional shape, such as a square or other polygonal cross-section. The slide rail 133 may also extend from other portions of the fixing base 130, such as from the outer surface of the side wall 131 of the fixing base 130.

[0064] Each side wall 131 of the fixing base 130 has an inner surface and an outer surface, wherein the inner surface is the surface of the two side walls 131 facing each other, and the outer surface is the surface of the two side walls 131 facing away from each other. A slot 132 is provided on the inner surface of each side wall 131 so that the plug 123 of the locking member 120 (see FIG. Figure 8 ) is inserted thereinto, thereby locking the position of the extension 110. The slot 132 can be formed in a plurality along the longitudinal direction, thereby providing a plurality of different locking positions for the extension 110. The slot 132 includes a vertical portion 132a and a longitudinal portion 132b, and the vertical portion 132a and the longitudinal portion 132b extend vertically and longitudinally, respectively, and intersect at one point to form an inverted "L"-shaped slot 132. The vertical portion 132a extends downward from the intersection, and the longitudinal portion 132b extends forward from the intersection. In the current embodiment, the vertical portion 132a and the longitudinal portion 132b have approximately the same length. In other embodiments, the vertical portion 132a and the longitudinal portion 132b may have different lengths.

[0065] Now refer to 5A-5B, Figure 8The specific structure of the locking member 120 is described below. As shown in the figure, the locking member 120 has a generally square handle 121 and two arms 122 extending from the handle 121. The two arms 122 extend from near the transverse center of the rear side of the handle 121, extending generally longitudinally near the handle 121, then gradually transitioning to extend transversely, extending to the left and right, respectively, to form arcs approximately one-quarter of the circumference of the two arms 122, mirror images of each other. The locking point includes a plug 123 located at the end of each arm 122 away from the handle 121. The plug 123 extends generally transversely and has a uniform transverse cross-sectional shape. The transverse cross-sectional shape of the plug 123 corresponds to the shape of the slot 132 in the side wall 131 of the fixing base 130 (i.e., an L-shape formed by a vertical portion 132a and a longitudinal portion 132b), and is slightly smaller than the slot 132 to facilitate insertion. The arm 122 is made of a rigid material, and the rigid material is capable of elastic deformation to a certain extent, so as to allow the arm 122 to be withdrawn from or inserted into a slideway 151 (described below) of the housing 150 .

[0066] Now refer to Figures 4A-5B Describe the crossbar 140. As shown in the figure, the crossbar 140 is a rod-shaped component that is inserted horizontally between the two side walls 131. The two ends of the crossbar 140 are respectively inserted through the inner and outer surfaces of the two side walls 131, and are ultimately exposed outside the outer surfaces. A stopper 141 is provided at each end of the crossbar 140. The stopper 141 can be an enlarged diameter portion of the crossbar 140 or an annular component that is sleeved on the crossbar 140. The stopper 141 is locked to the outside of the outer surface of the side walls 131, thereby limiting the movement of the two side walls 131 away from each other.

[0067] The applicant has discovered that when the footrest 300 is impacted (particularly a downward or rearward impact) during use of the child safety seat, the footrest 300 transmits the impact force to the extension member 110, and further to the locking member 120. Because the two arms 122 of the locking member 120 have laterally extending portions, the locking member 120 is able to convert the impact force into a lateral thrust against the sidewalls 131, particularly a lateral thrust from the inside toward the outside of the sidewalls 131. In such circumstances, the two sidewalls 131 may move away from each other, i.e., outward, causing the plugs 123 of the arms 122 to disengage from the slots 132 of the sidewalls 131. As a result, the locking member 120 releases its positional lock on the footrest 300, thereby causing a shift-out phenomenon.

[0068] Thanks to the crossbar 140, the two side walls 131 are restrained from moving away from each other, effectively preventing the phenomenon of shifting. Specifically, when the extension member 110 is subjected to a certain external force, particularly when a passenger steps on the extension member 110, the extension member 110 may transmit the impact to the two side walls 131 of the fixing base 130, thereby exerting a lateral outward thrust on the side walls 131. However, the crossbar 140 restrains the movement of the two side walls 131 from the outside, absorbing the impact caused by the extension member 110 and preventing the extension member 120 from being disengaged due to the side walls 131 moving away from each other. This effectively ensures the stability of the extension member 110 after extension, and thus the stability of the footrest 300 after extension. In particular, kicking the footrest 300 by the passenger prevents the extension member 110 from shifting and retracting, ensuring normal use of the footrest 300 and preventing injury to the passenger due to the extension member 110 retracting, thereby improving user safety.

[0069] The applicant further discovered that the crossbar 140 can be positioned at any position within the triangular region below the slot 132 of the side wall 131, with the preferred position being Figure 4B The crossbar 140 is positioned at the position shown in FIG, i.e., approximately the front third of the longitudinal length of the side wall 131 and close to the lower oblique edge of the side wall 131. The diameter of the crossbar 140 can be up to approximately one-half the length of the vertical side of the side wall 131 (approximately 43 mm), and the preferred diameter is approximately one-tenth the length of the vertical side of the side wall 131 (approximately 8 mm). The length LB of the portion of the crossbar 140 located between the two side walls 131 is greater than the lengths LA and LC of the portion of the crossbar 140 inserted inside each side wall 131. In a preferred embodiment, LB = 188 mm, LA = LC = 40 mm.

[0070] Now refer to Figure 6 The housing 150 is described below. As shown, the housing 150 is a generally rectangular component that snaps onto the bottom side of the extension 110 and moves with the extension 110. The housing 150 is positioned between the two side walls 131 of the fixing base 130. In one embodiment, the left and right edges of the housing 150 abut the inner surfaces of the two side walls 131 of the fixing base 130. The two arms 122 of the locking member 120 are at least partially positioned between the housing 150 and the extension 110.

[0071] The housing 150 is provided with two slideways 151 on the side facing the extension member 110, as shown by the dashed lines in the figure. The shapes of these two slideways 151 correspond to the shapes of the two arms 122 of the locking member 120. Specifically, the slideways 151 extend from the front edge of the housing 150 near the center, initially extending rearward in a generally longitudinal direction, and then gradually transitioning to extend laterally (the two slideways 151 face left and right, respectively), thereby forming two arc-shaped slideways 151 extending from the front edge of the housing 150 to both side edges.

[0072] The two arms 122 of the locking member 120 are respectively housed in two slideways 151 of the housing 150, and their movement paths are defined by the slideways 151. The longitudinal movement of the handle 121 is converted into lateral movement of the plug 123 at the end of the arm 122 by the slideways 151. Specifically, when the handle 121 moves forward (i.e., reaches the release position), the plug 123 moves laterally inward, thereby retracting into the housing 150. When the handle 121 moves backward (i.e., reaches the locking position), the plug 123 moves laterally outward, thereby extending from the housing 150.

[0073] In one embodiment, the arm 122 of the locking member 120 is a member having shape memory and tends to extend from the housing 150. When the locking member 120 moves to the released position, the arm 122 moves into the housing 150, thereby generating a return force toward the locked position. In this way, the locking member 120 is preloaded to tend to move toward the locked position due to the elasticity of the arm 122.

[0074] In another embodiment, an additional elastic member, such as a spring, is provided between the locking member 120 and the extending member 110. The elastic member biases the locking member 120 toward the locking position.

[0075] Reference Figures 9A-11 , which shows the structure of the shell 150 and its positional relationship with the extension piece 110 and the fixing seat 120.

[0076] The housing 150 has two lateral sides formed with plug slots 152. The shape of the plug slots 152 is substantially the same as the cross-sectional shape of the plug 123, i.e., an L-shape. The plug 123 can be extended from the housing 150 or retracted into the housing 150 through the plug slots 152. Therefore, when the plug 123 is extended from the housing 150, it is simultaneously located in the plug slots 152 and the slot 132. In this way, the plug 123 locks the relative positions of the plug slots 152 and the slot 132, thereby also locking the relative positions of the housing 150 and the fixing base 130. Moreover, because the housing 150 is fixed to the extension member 110, the plug 123 also locks the relative positions of the extension member 110 and the fixing base 130.

[0077] The operation of the anti-jump device 100 according to the present application will now be described.

[0078] When the user wishes to unlock the footrest 300, they need to reach under the seat portion 200 and pull the handle 121 of the locking member 120 against the footrest 300. This causes the locking member 120 to overcome the biasing force that preloads it toward the locked position and move to the released position. Simultaneously, the arm 122 of the locking member 120 retracts into the housing 150, and the plug 123 of the locking member 120 disengages the slot 132 in the sidewall 131 of the mounting base 130. This releases the extension member 110 (and the footrest 300) from its locked relationship with the mounting base 130 (and the seat portion 200), allowing the user to move the footrest 300 to the appropriate position, including the extended position and the retracted position.

[0079] When a user wishes to lock the footrest 300, they need to release the handle 121 of the locking member 120 and move the footrest 300 to an appropriate position, including an extended position and a retracted position, so that the plug 123 on the locking member 120 can align with the slot 132 on the fixing member. In this way, because the locking member 120 is preloaded to move toward the locked position, the plug 123 will extend from the plug slot 152 of the housing 150 and insert into the slot 132. At the same time, because the plug 123 on the arm 122 is still located in the plug slot 152, the plug 123 locks the positional relationship between the housing 150 and the fixing base 130, thereby forming a locked relationship between the extension member 110 (and the footrest 300) and the fixing base 130 (and the seat portion 200).

[0080] Although the present application has been described with reference to exemplary embodiments, the terms used are illustrative and exemplary rather than restrictive. Since the present application can be embodied in various forms without departing from the spirit and essence of the present application, it should be understood that the above-described embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the scope of the claims, and all variations that fall within the scope of the claims or their equivalents are intended to be covered by the claims.

Claims

1. An anti-jump gear device (100), comprising: The fixing seat (130) is symmetrically separated on both sides and has a slide rail (133) extending in the longitudinal direction and two side walls (131) facing each other in a transverse direction perpendicular to the longitudinal direction; An extension member (110) is movably inserted into the fixing seat (130) and is capable of sliding along the slide rail (133) so as to move between an extended position and a retracted position relative to the fixing seat (130); a locking member (120) for connecting the fixing seat (130) and the extending member (110) to lock the position of the extending member (110) relative to the fixing seat (130); as well as a crossbar (140) disposed between the two side walls (131) to prevent the two side walls (131) from being laterally displaced from each other; The fixing seat (130) is provided with at least two groups of slots (132) on the opposite surfaces of the two side walls (131); The slot (132) includes a longitudinal portion (132b) and a vertical portion (132a), wherein the longitudinal portion (132b) and the vertical portion (132a) are respectively substantially linear and intersect each other at an intersection point; The locking member (120) has two arms (122) extending toward the two side walls (131) respectively. The ends of the two arms (122) are respectively provided with plugs (123). The plugs (123) have a shape corresponding to the slot (132), so that they can be smoothly inserted into the slot (132) and form a shape match with the slot (132).

2. The anti-jump gear device (100) according to claim 1, wherein: The two ends of the cross bar (140) are respectively passed through the outside of the two side walls (131) and are fastened to the two side walls (131) on the outside through fixed stoppers (141) to prevent the two side walls (131) from lateral displacement away from each other.

3. The anti-jump gear device (100) according to claim 2, wherein: The cross bar (140) is arranged on one side of the extension member (110) at a position that does not interfere with the movement path of the extension member (110).

4. The anti-jump device (100) according to claim 3, further comprising: a housing (150) fixed to the extension member (110) and located between the crossbar (140) and the extension member (110); Both sides of the housing (150) are respectively provided with plug slots (152) matching the slots (132); When the slot (132) is aligned with the plug slot (152), the locking member (120) is inserted into both the slot (132) and the plug slot (152), thereby fixing the position of the extension member (110) relative to the fixing seat (130).

5. The anti-jump gear device (100) according to claim 4, wherein: The locking member (120) is located on a side of the extension member (110) facing the crossbar (140), and comprises a handle (121) and two symmetrically arranged arms (122), wherein the two arms (122) extend from the handle (121) toward two side walls (131) of the fixing seat (130). When the slot (132) is aligned with the plug slot (152), the plug (123) can be inserted into both the slot (132) and the plug slot (152).

6. The anti-jump gear device (100) according to claim 5, wherein: The handle (121) is located in the transverse middle position of the extension member (110), and the two arms (122) are arc-shaped parts respectively extending from the transverse middle position of the handle (121) toward the two side walls (131) in an approximately quarter-circle arc.

7. The anti-jump device (100) according to claim 6, wherein: The arm (122) is a rigid arm.

8. The anti-jump device (100) according to claim 7, wherein: One of the at least two groups of slots (132) corresponds to the extended position of the extension member (110), and the other of the at least two groups of slots (132) corresponds to the retracted position of the extension member (110).

9. The anti-jump device (100) according to claim 8, wherein two slideways (151) are formed in the shell and extend toward the two side walls (131) in an approximately quarter-circle arc, respectively, for accommodating the two arms (122) respectively, thereby limiting the movement trajectory of the two arms (122).

10. The anti-jump gear device (100) according to claim 9, wherein: When the extension member (110) is in the extended position or the retracted position, the arm (122) of the locking member (120) extends from the slideway (151) and is inserted into the slot (132) and the plug slot (152); when pulled by an external force, the arm (122) of the locking member (120) can be retracted into the slideway (151) and disengaged from the slot (132) and the plug slot (152), so that the extension member (110) can slide along the longitudinal direction relative to the fixing seat (130).

11. The anti-jump device (100) according to claim 10, wherein: An elastic member is provided between the locking member (120) and the housing (150), and the elastic member applies a reset force to the locking member (120), so that the two arms (122) of the locking member (120) remain in a state of extending from the slideway (151).

12. The anti-jump device (100) according to claim 1, wherein: The crossbar is disposed approximately at the front third of the longitudinal length of the sidewall; The diameter of the crossbar is approximately one-tenth the length of the vertical edge of the side wall; The length of the portion of the cross bar located between the two side walls is greater than the length of the portion of the cross bar inserted inside each of the side walls.

13. A seat footrest device, comprising: Foot pedal (300); as well as The anti-jump device (100) according to any one of claims 1 to 12; Wherein, the foot pedal (300) is covered on the extension piece (110) of the anti-jump gear device (100).

14. The seat footrest device according to claim 13, wherein: The handle (121) of the locking member (120) of the anti-jump gear device (100) is exposed on a side of the foot pedal (300) facing the crossbar (140).

15. A child safety seat, comprising: a seat portion (200); as well as The seat footrest device according to any one of claims 13-14; The footrest (300) of the seat footrest device and the anti-jump gear device (100) are respectively located below the seat portion (200). The fixing seat (130) of the anti-jump gear device (100) is fixed to the bottom side of the seat portion (200), the longitudinal direction is the front-to-back direction of the seat portion (200), and the transverse direction is the left-to-right direction of the seat portion (200); When the extension member (110) is in the extended position, the footrest (300) extends from the bottom side of the seat portion (200) to the front of the seat portion (200); when the extension member (110) is in the retracted position, the footrest (300) is at least partially located below the bottom side of the seat portion (200); The handle (121) of the locking member (120) of the anti-jump gear device (100) is exposed below the foot pedal (300).

Images