Unlocking mechanism, adjusting device and stroller

Abstract

The present disclosure provides an unlocking mechanism, an adjusting device (2) and a stroller (1). The unlocking mechanism is configured to release relative positioning between a first member (11) and a second member (12) and includes: a locking member (100) configured to be movable between a locking position and an unlocking position, the locking member (100) in the locking position blocking relative motion between the first member (11) and the second member (12); and a safety lock member (S100) configured to be movable between a safety locking position and a safety unlocking position, the safety lock member (S100) in the safety locking position blocking the relative motion between the first member (11) and the second member (12). The first member (11) and the second member (12) are allowed to move relative to each other when the locking member (100) is in the unlocking position and the safety lock member (S100) is in the safety unlocking position. The unlocking mechanism according to the present disclosure can reliably maintain or release the relative positioning between the two members (11, 12).

Description

TECHNICAL FIELD

[0001] The present disclosure relates to an unlocking mechanism and, more particularly, to an adjusting device provided with an unlocking mechanism, and a stroller equipped with the unlocking mechanism and the adjusting device. BACKGROUND

[0002] In a process of using and pushing a stroller, angle adjustment of a backrest is quite common, especially for children under half a year old. A common mode of use for the stroller is a lying mode, that is, in the lying mode, an angle between the backrest and a seating portion of a seat of the stroller may be greater than 150 degrees. However, if the stroller is pushed on uneven ground, the backrest will jump out of position due to impact from the ground, causing the backrest of the seat of the stroller to pivot towards an upright position, and reducing the angle between the backrest and the seating portion, which may pose potential safety hazards and frighten babies. SUMMARY

[0003] The present disclosure aims to provide an unlocking mechanism that can reliably maintain or release relative positioning between two members, in order to reduce the problem that a backrest of a stroller may automatically jump out of position.

[0004] According to an aspect of the present disclosure, there is provided an unlocking mechanism for releasing relative positioning between a first member and a second member. The unlocking mechanism includes: a locking member configured to be movable between a locking position and an unlocking position, the locking member in the locking position blocking relative motion between the first member and the second member; and a safety lock member configured to be movable between a safety locking position and a safety unlocking position, the safety lock member in the safety locking position blocking the relative motion between the first member and the second member. The first member and the second member are allowed to move relative to each other when the locking member is in the unlocking position and the safety lock member is in the safety unlocking position.

[0005] In an embodiment, the unlocking mechanism includes a safety lock operating member operable to drive the safety lock member to move to the safety unlocking position.

[0006] In an embodiment, the unlocking mechanism further includes a safety lock traction member, one end of the safety lock traction member is connected to the safety lock member, and another end of the safety lock traction member is connected to the safety lock operating member, so that the safety lock operating member drives the safety lock member via the safety lock traction member.

[0007] In an embodiment, the safety lock traction member includes a traction wire, and a traction wire head is provided at each of two ends of the traction wire. At least one of the safety lock member and the safety lock operating member is provided with a traction member fixing portion, the traction member fixing portion is able to accommodate the traction wire head, and a traction member channel is provided on a side wall of the traction member fixing portion, to allow a traction wire connected to the traction wire head to extend out of the traction member fixing portion through the traction member channel.

[0008] In an embodiment, the safety lock operating member is movably disposed on the first member and is movable between an operating member locking position where the safety lock operating member allows the safety lock member to remain in the safety locking position and an operating member unlocking position where the safety lock operating member drives the safety lock member to move to the safety unlocking position via the safety lock traction member.

[0009] In an embodiment, the safety lock operating member is a rotary knob rotatably mounted to a fixing base, and the fixing base is connected to the first member.

[0010] In an embodiment, the fixing base is provided with a safety lock retainer that is movable and configured to retain the rotary knob in the operating member unlocking position.

[0011] In an embodiment, the safety lock retainer is provided with a retainer blocking structure, and the rotary knob is provided with a rotary knob blocking structure that is engageable with the retainer blocking structure to retain the rotary knob in the operating member unlocking position. The unlocking mechanism is further provided with a retainer elastomer configured to drive the safety lock retainer to abut against the rotary knob.

[0012] In an embodiment, the rotary knob is further provided with another rotary knob blocking structure that is engageable with the retainer blocking structure to retain the rotary knob in the operating member locking position.

[0013] In an embodiment, the safety lock operating member is a push button slidably mounted to the first member, and the push button is configured to drive the safety lock member via the safety lock traction member.

[0014] In an embodiment, a push button transmission member is provided between the push button and the safety lock traction member and is configured to transmit a sliding motion of the push button in a first direction to another end of the safety lock traction member moving in a second direction, the first direction and the second direction being same or different.

[0015] In an embodiment, the push button is provided with a push button slope, the push button transmission member is provided with a transmission slope, the push button slope abuts against the transmission slope, and inclination directions of the push button slope and the transmission slope are inclined to a movement direction of the push button.

[0016] According to another aspect of the present disclosure, there is provided an adjusting device for adjusting a position to which a first member moves relative to a second member, the adjusting device being disposed on the first member and including the above-mentioned unlocking mechanism.

[0017] In an embodiment, the adjusting device includes: a reel configured to be rotatable to allow a tether to be wound on the reel, two ends of the tether extending out of the adjusting device and being fixed relative to the second member, and an increase or decrease in an effective length of the tether enables adjustment of the position to which the first member moves relative to the second member. The reel is provided with a plurality of reel engaging structures, the safety lock member is provided with a safety lock engaging structure, and when the safety lock member moves to the safety locking position, the safety lock engaging structure is engaged with one of the reel engaging structures to block rotation of the reel.

[0018] In an embodiment, the reel is provided with a ratchet or gear that rotates coaxially, and when the locking member moves to the locking position, an engaging portion of the locking member engages with teeth on the ratchet or gear to block rotation of the ratchet or gear in at least one direction, in which the plurality of reel engaging structures are inner teeth disposed on the ratchet or gear.

[0019] In an embodiment, a safety lock elastic member is provided in the adjusting device, and the safety lock elastic member is configured to drive the safety lock engaging structure to engage with one of the reel engaging structures.

[0020] According to yet another aspect of the present disclosure, there is provided a stroller with a seat. The stroller is provided with the above-mentioned adjusting device and the above-mentioned unlocking mechanism. The unlocking mechanism is configured to unlock the adjusting device, the first member is a backrest of the seat, and the second member is a seating portion of the seat.

[0021] The objectives, features, aspects, and advantages of the present disclosure will become more apparent from the following detailed description of the present disclosure in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are included herein to provide further understanding of the present disclosure, and are incorporated into and constitute a part of this specification. The drawings illustrate embodiments of the present disclosure and, together with the following description, serve to explain principles of the present disclosure.

[0023] In the drawings:

[0024] FIG. 1A to FIG. IC are schematic views of a stroller equipped with an adjusting device.

[0025] FIG. 2 and FIG. 3 are exploded views of an adjusting device using an unlocking mechanism as observed from two angles.

[0026] FIG. 4 and FIG. 5 are schematic views of an appearance of the adjusting device shown in FIG. 2 as observed from two angles.

[0027] FIG. 6A and FIG. 6B are schematic views of a reel of an adjusting device as observed from two angles.

[0028] FIG. 7A and FIG. 7B are schematic views of an auxiliary disc of an adjusting device as observed from two angles.

[0029] FIG. 8, FIG. 9 and FIG. 10 are schematic views illustrating an internal structure of the adjusting device shown in FIG. 2 as observed from three angles.

[0030] FIG. 11A and FIG. 12A are schematic views illustrating that a locking member of the adjusting device shown in FIG. 2 is in a locking position and an unlocking position, respectively.

[0031] FIG. 11B and FIG. 12B are schematic views of another embodiment of an adjusting device.

[0032] FIG. 13 is a schematic view of an appearance of an adjusting device using a first embodiment of an unlocking mechanism according to the present disclosure.

[0033] FIG. 14 is a partially exploded view of the adjusting device shown in FIG. 13.

[0034] FIG. 15 is a schematic view of the adjusting device shown in FIG. 13 with a first outer cover removed.

[0035] FIG. 16 is a schematic view of the adjusting device shown in FIG. 13 with a first outer cover and a safety lock traction member removed.

[0036] FIG. 17 is a schematic view of the adjusting device shown in FIG. 15 in a locked state.

[0037] FIG. 18 is a schematic view of the adjusting device shown in FIG. 15 in an unlocked state.

[0038] FIG. 19 is a schematic view of the adjusting device shown in FIG. 17 with an inner cover and a safety lock member removed.

[0039] FIG. 20 is a schematic view of a safety lock member of the unlocking mechanism shown in FIG. 14.

[0040] FIG. 21 and FIG. 22 are schematic views illustrating that the safety lock member shown in FIG. 14 is in a safety locking position.

[0041] FIG. 23 and FIG. 24 are schematic views illustrating that the safety lock member shown in FIG. 14 is in a safety unlocking position.

[0042] FIG. 25 is a partially exploded view of an operating member and a safety lock operating member of the unlocking mechanism shown in FIG. 13.

[0043] FIG. 26 is a partially exploded view of the unlocking mechanism shown in FIG. 13 with a fixing base removed.

[0044] FIG. 27 is a side view of the adjusting device shown in FIG. 26 with a first outer cover and an inner cover removed, in which a safety lock operating member is in an operating member locking position.

[0045] FIG. 28 is a side view of the adjusting device shown in FIG. 26 with a first outer cover and an inner cover removed, in which a safety lock operating member is in an operating member unlocking position.

[0046] FIG. 29 is a front view of an adjusting device using a second embodiment of an unlocking mechanism according to the present disclosure, in which the adjusting device is mounted to a first member.

[0047] FIG. 30 is a schematic view of an appearance of an adjusting device using a second embodiment of an unlocking mechanism according to the present disclosure.

[0048] FIG. 31 is a schematic view of the adjusting device shown in FIG. 30 with a first outer cover removed.

[0049] FIG. 32 is a schematic view of a safety lock member of the unlocking mechanism shown in FIG. 31.

[0050] FIG. 33 shows a safety lock operating member of the unlocking mechanism shown in FIG. 30 observed from another angle, in which the safety lock operating member at a right side removes a push button base and is in an operating member locking position.

[0051] FIG. 34 is a schematic view illustrating that a safety lock member of the unlocking mechanism shown in FIG. 31 is in a safety locking position.

[0052] FIG. 35 shows a safety lock operating member of the unlocking mechanism shown in FIG. 30 observed from another angle, in which the safety lock operating member at a right side removes a push button base and is in an operating member unlocking position.

[0053] FIG. 36 is a schematic view illustrating that a safety lock member of the unlocking mechanism shown in FIG. 31 is in a safety unlocking position.

[0054] FIG. 37 is a schematic view of a box using an unlocking mechanism according to the present disclosure.

[0055] FIG. 38 is a schematic view illustrating that the box shown in FIG. 37 is opened.

[0056] FIG. 39 is a schematic view of a baby carrier using an unlocking mechanism according to the present disclosure.

[0057] FIG. 40 is a schematic view illustrating angle adjustment of a support assembly of the baby carrier shown in FIG. 39 relative to a carrying assembly.

[0058] Reference numerals 1 stroller 11 backrest, first member 12 seating portion, second member 13 frame 2 adjusting device 20 housing 21 first outer cover 22 second outer cover 23 inner cover 23 A safety lock guiding portion 23B sheath fixing portion 231 fixing post 232 connection portion 233 through hole 234 orifice 24 reel 24A first disc 24A1, 24A2 reel engaging portion 24B second disc 24C intermediate connecting portion 240 tether 241 winding groove 242 mounting hole 243 snap slot 244 ratchet 245, 245 ’ guide groove 246 gear 248 reel engaging structure 25 clockwork spring 251 first end 252 second end 26 connector 27 auxiliary disc 271 body 272 first limiting piece 273 second limiting piece 274 limiting channel 28 elastic member 281 one end 282 another end 3 box 31 cover 32 main body 4 baby carrier 41 carrying assembly 42 support assembly 100 locking member 101 connection side 102 free side 103 engaging portion 104 protrusion 200 driving member 201 first end 202 second end 300 pull handle 300” slide handle 303” sliding groove 304” operating member force-applying portion 500 fixing base 504 reset spring 510 fixed pivot shaft 520 retainer accommodating portion 600 fixing pin DI winding direction D2 unwinding direction SI00 safety lock member SI01 safety lock engaging structure SI02 safety lock elastic member S103 elastic member fixing portion S200 safety lock traction member S210 sheath S220 traction wire S221 traction wire head S230 traction member fixing portion S240 traction member channel S300 rotary knob, safety lock operating member S310 safety lock retainer S311 retainer elastomer S312 retainer blocking structure S301 rotary knob blocking structure S302 further rotary knob blocking structure S300’ push button, safety lock operating member S301 ’ push button slope S302’ push button base S310’ push button transmission member S311’ transmission slope DETAILED DESCRIPTION

[0059] The present disclosure will be described in detail below with reference to the accompanying drawings.

[0060] It should be understood that, in the following description of embodiments, directional terms such as “upper,” “lower,” and “top” are merely illustrative descriptions with reference to the accompanying drawings, and do not limit directional and positional relationships of associated objects or elements.

[0061] An unlocking mechanism according to the present disclosure may be used to release relative positioning between a first member and a second member, allowing relative motion between the first member and the second member. It should be understood that the unlocking mechanism according to the present disclosure may be applied in various situations to release relative positioning between two members.

[0062] For example, the first member and the second member may be a backrest 11 and a seating portion 12 of a seat of a stroller 1 respectively, or a backrest and a seating portion of a safety seat respectively (see FIGS. 1A, IB, IC); may also be a cover (e.g., a door or a lid) 31 covering an opening and a main body 32 of a box 3 respectively (see FIGS. 37 and 38); and may also be a support assembly 42 and a carrying assembly 41 of a baby carrier 4 (see FIGS. 39 and 40).

[0063] In addition, the first member and the second member unlocked by the unlocking mechanism according to the present disclosure may be in a situation where one is fixed and the other is movable, or in a situation where both are movable.

[0064] In order to describe the unlocking mechanism according to the present disclosure more clearly, an application of the unlocking mechanism to the stroller 1 will be first exemplified.

[0065] Stroller Adopting Unlocking Mechanism

[0066] FIGS. 1A-1C illustrate a stroller 1. In this embodiment, the first member is a backrest 11 of a seat of the stroller 1, while the second member is a seating portion 12 of the seat. The seating portion 12 is mounted to a frame 13 of the stroller 1. Motion of the backrest 11 relative to the seating portion 12 is a pivoting motion. For example, the backrest 11 may pivot relative to the seating portion 12 to a contact position where the backrest 11 contacts the seating portion 12, or may pivot to an upright position, or may pivot to a lying position. In other words, a position to which the backrest 11 may pivot relative to the seating portion 12 includes the contact position, the upright position, the lying position, and other suitable positions between any two of these three positions.

[0067] The position to which the backrest 11 pivots relative to the seating portion 12 of the seat is adjusted by an adjusting device 2, and the adjusting device 2 is unlocked by an unlocking mechanism according to the present disclosure.

[0068] In the present disclosure, the “upright position” means that the position to which the backrest 11 pivots relative to the seating portion 12 allows a baby to sit upright on the stroller; for example, an angle of the backrest 11 relative to the seating portion 12 is about 90 degrees, but is not limited thereto. The “lying position” means that the position to which the backrest 11 pivots relative to the seating portion 12 allows the baby to lie flat on the stroller; for example, the angle of the backrest 11 relative to the seating portion 12 is about 180 degrees, but is not limited thereto. It should be understood that in the present disclosure, the position to which the backrest 11 can pivot relative to the seating portion 12 includes the contact position, the upright position, the lying position, and other suitable positions between any two of these three positions. The “suitable positions” mean that the position to which the backrest 11 pivots relative to the seating portion 12 allows the baby to sit comfortably on the stroller or allows the stroller to fulfil some usage requirements, such as folding of the seat or the stroller.

[0069] A situation where the backrest 11 pivots relative to the seating portion 12 between the upright position and the lying position (including a situation of pivoting to the upright position or the lying position) will be exemplified below.

[0070] For ease of description, a direction in which the seat faces is defined as “front”, and a direction in which the seat faces away is defined as “rear”.

[0071] Adjusting Device Including Unlocking Mechanism

[0072] It should be understood that, in the embodiment shown in FIGS. 1A to IC, the adjusting device 2 according to the present disclosure is used to adjust the position to which the backrest 11 of the seat of the stroller pivots relative to the seating portion 12 of the seat. However, the present disclosure is not limited thereto, and the adjusting device 2 according to the present disclosure may also be used to adjust relative positioning between other two members, for example, adjusting a position to which a backrest of another seat (e.g., a safety seat) pivots relative to a seating portion thereof, or adjusting a position of a cover 31 relative to a main body 32 (see FIGS. 37 and 38), or adjusting a position of a support assembly 42 of a baby carrier 4 relative to a carrying assembly 41 thereof (see FIGS. 39 and 40).

[0073] As shown in FIGS. 1A-1C, the adjusting device 2 is disposed at a rear side of the backrest 11 of the stroller 1. Certainly, the adjusting device 2 may also be arranged at other suitable positions of the stroller 1 as long as it is convenient for a user to operate.

[0074] In an embodiment shown in FIGS. 2-5, the adjusting device 2 may include a first outer cover 21, a second outer cover 22, and an inner cover 23 between the first outer cover 21 and the second outer cover 22; and the first outer cover 21, the second outer cover 22, and the inner cover 23 constitute a housing 20 of the adjusting device 2 (see FIGS. 4 and 5). However, the present disclosure is not limited thereto. In another embodiment, two or three of the first outer cover 21, the second outer cover 22, and the inner cover 23 may be an integrally formed member. In yet another embodiment, the first outer cover 21 may be omitted.

[0075] The adjusting device 2 may further include a reel 24, and the reel 24 is disposed to be rotatable between the inner cover 23 and the second outer cover 22, so that a tether 240 (see FIGS. IC and 6A) is wound on the reel, and two ends of the tether 240 extend out of the housing 20 (as shown in FIGS. IC, 4 and 5) and are fixed to the frame 13 of the stroller 1. Certainly, two ends of the tether 240 may also be fixed to the seating portion 12 or other parts of the stroller 1, as long as the two ends of the tether 240 are immobilized relative to the seating portion 12.

[0076] It should be noted that the tether 240 shown in the drawings is merely illustrative. In an embodiment shown in FIGS. 6A and 6B, the reel 24 includes a first disc 24A and a second disc 24B that are annular, and the first disc 24A and the second disc 24B are connected by an intermediate connecting portion 24C, so that a winding groove 241 extending in a peripheral direction is formed between the first disc 24A and the second disc 24B, the first disc 24A and the intermediate connecting portion 24C jointly form a mounting hole 242 in the reel 24, and the first disc 24A is further provided with two guide grooves 245 and 245’. The guide grooves 245 and 245’ may be symmetrically disposed on the first disc 24A as shown in FIG. 6A, or may be asymmetrically disposed, and the positions thereof may be adjusted according to actual requirements.

[0077] The adjusting device 2 may further include a clockwork spring 25. As shown in FIG. 2, the clockwork spring 25 is located inside the reel 24 and, for example, may be disposed in the mounting hole 242 within the reel 24 as shown in FIG. 6A.

[0078] The adjusting device 2 may further include a connector 26 for fixing the adjusting device 2 to the backrest 11. The connector 26 is disposed at a front side of a backrest plate of the backrest 11, and the second outer cover 22 is disposed at a rear side of the backrest plate of the backrest 11. As shown in FIGS. 2 and 3, the adjusting device 2 may be fixed to the backrest 11 by a fixing member (e.g. a screw) sequentially passing through the connector 26, the backrest plate, the second outer cover 22, the inner cover 23 and the first outer cover 21.

[0079] In another embodiment, the connector 26 may not be provided, and the housing 20 of the adjusting device 2 is directly fixed to the backrest 11 by a fixing member (e.g. a screw), thereby reducing the number of components, and optimizing the fixation manner.

[0080] In the adjusting device 2, the tether 240 functions to carry the backrest 11 of the seat of the stroller 1. As the backrest 11 pivots towards the upright position or towards the lying position, an effective length of the tether 240 required to carry the backrest 11 (i.e., a length of a portion of the tether 240 extending out of the housing 20 of the adjusting device 2) will vary. In order to keep the tether 240 in a tensioned state for carrying the backrest 11, the reel 24 winds a part of the tether 240 thereon and, by its own rotation, winds or unwinds a part of the tether 240 as needed. As shown in FIGS. 6A and 6B, the winding groove 241 is provided at a peripheral side of the reel 24, and the tether 240 is wound in the winding groove 241.

[0081] In addition, as shown in FIGS. 8 and 9, the clockwork spring 25 is configured to drive the reel 24 to rotate in a winding direction DI, so that the reel 24 can be driven to rotate in the winding direction DI by means of an elastic force of the clockwork spring 25, at which time the tether 240 is wound on the reel 24. On the other hand, when the reel 24 rotates in an unwinding direction D2 opposite to the winding direction DI, the clockwork spring 25 is wound tightly, at which time the tether 240 is unwound from the reel 24.

[0082] More specifically, an embodiment shown in FIGS. 8 and 9 illustrate one arrangement of the clockwork spring 25. In this embodiment, the clockwork spring 25 is coiledly disposed in the mounting hole 242 within the reel 24; a first end 251 of the clockwork spring 25 snaps into a fixing post 231 of the inner cover 23, and a second end 252 of the clockwork spring 25 snaps into a snap slot 243 in a side wall of the mounting hole 242 of the reel 24. Certainly, the present disclosure is not limited thereto, and the clockwork spring 25 may be arranged in other common manners, as long as it can drive the reel 24 to rotate.

[0083] As shown in FIGS. 2, 3 and 10, in order to prevent the clockwork spring 25 from separating from the mounting hole 242 of the reel 24, an auxiliary disc 27 may be provided outside the mounting hole 242, and the auxiliary disc 27 is configured to block the clockwork spring 25.

[0084] In addition, the auxiliary disc 27 also functions to assist in winding the tether 240. In an embodiment shown in FIGS. 7A and 7B, the auxiliary disc 27 includes a body 271 and a first limiting piece 272 and a second limiting piece 273 extending outwards from an outer periphery of the body 271; the first limiting piece 272 and the second limiting piece 273 are spaced apart in an axial direction to form a limiting channel 274 (see FIG. 7A) through which the tether 240 passes, and the limiting channel 274 can prevent the tether 240 from slipping off from the auxiliary disc 27.

[0085] The tether 240 is wound around only a half of an outer periphery of the auxiliary disc 27, so that in the embodiment shown in FIG. 7A, the first limiting piece 272 and the second limiting piece 273 are only disposed on the half of the outer periphery of the auxiliary disc 27. It should be understood that the first limiting piece 272 and the second limiting piece 273 may also be disposed on the entire outer periphery of the auxiliary disc 27. In addition, although the first limiting piece 272 and the second limiting piece 273 are staggered in the peripheral direction in FIGS. 7A and 7B, the first limiting piece 272 and the second limiting piece 273 may also be opposite in the peripheral direction. Moreover, the number of the first limiting pieces 272 and the second limiting pieces 273 may be set as required.

[0086] One way in which the tether 240 is wound on the reel 24 will be described in detail in conjunction with FIGS. 6A, 7A and 10. In this way, the tether 240 enters the housing 20 of the adjusting device 2 through one orifice 234 (see FIG. 5) at a peripheral side of the inner cover 23, then enters the mounting hole 242 through one guide groove 245 in the reel 24, passes through the limiting channel 274 of the auxiliary disc 27 (the auxiliary disc 27 is not shown in FIG. 6A), and winds around a portion of the reel 24 provided with the first limiting piece 272 and the second limiting piece 273, so that the tether 240 bypasses the mounting hole 242, then leaves the mounting hole 242 through the other guide groove 245’ in the reel 24, then is wound several turns in the winding groove 241 of the reel 24, and finally extends out of the housing 20 of the adjusting device 2 through another orifice at an opposite peripheral side of the inner cover 23.

[0087] By passing the tether 240 through the limiting channel 274 of the auxiliary disc 27, the tension of the tether 240 can be increased, thereby improving the stability of unwinding the tether 240 from the reel 24.

[0088] It should be understood that the way in which the tether 240 is wound on the reel 24 is not limited thereto. In other embodiments of the present disclosure, the auxiliary disc 27 may not be provided, so that a portion of the tether 240 passing through the mounting hole 242 is in a straight line, and thus the tether 240 is in a tensioned state.

[0089] Additionally, in an embodiment shown in FIG. 6A, only one tether 240 is used. However, in other embodiments, two tethers 240 may also be used, the reel 24 is correspondingly provided with two winding grooves 241, and one end of each tether 240 is fixed in one winding groove 241, while the other end thereof is fixed to the frame 13 of the stroller 1, so that each tether 240 is wound in the corresponding winding groove 241.

[0090] In another embodiment, the adjusting device 2 according to the present disclosure may not be provided with the clockwork spring 25, and the tether 240 is configured as an inherently elastic member, so that the tether 240 can drive the reel 24 to rotate by its own elasticity.

[0091] An obtuse angle is formed between the backrest 11 and the seating portion 12. When the user adjusts the backrest 11 of the stroller 1 by pivoting it towards the upright position, the obtuse angle between the backrest 11 and the seating portion 12 becomes smaller, so that the effective length of the tether 240 required to carry the backrest 11 becomes shorter, and the reel 24 can tighten the loose tether 240, thereby allowing the clockwork spring 25 to drive the reel 24 to rotate in the winding direction DI. When the backrest 11 pivots to the upright position, a large portion of the tether 240 is wound on the reel 24, leaving only a small portion extending out of the reel 24 and fixed to the frame 13 of the stroller 1, so that the reel 24 can no longer rotate in the winding direction DI.

[0092] When the user adjusts the backrest 11 of the stroller 1 by pivoting it towards the lying position, the obtuse angle between the backrest 11 and the seating portion 12 becomes larger, so that the effective length of the tether 240 required to carry the backrest 11 becomes longer. When the backrest 11 pivots to the lying position, a large portion of the tether 240 is unwound from the reel 24, leaving only a small portion positioned on the reel 24, so that the reel 24 can no longer rotate in the unwinding direction D2, thereby preventing further rotation of the backrest 11. In addition, during unwinding of the tether 240 from the reel 24, the reel 24 is driven to rotate in the unwinding direction D2, so that the clockwork spring 25 positioned within the reel 24 is tightened.

[0093] Thus, by adjusting the effective length of the tether 240, the position to which the backrest 11 pivots relative to the seating portion 12 can be controlled. On the premise that the length of the tether 240 is the same, an angle of rotation of the reel 24 in a process of from fully unwinding the tether 240 to fully winding the tether 240 is related to a diameter of the reel 24. When the diameter of the reel 24 is larger, the angle of rotation of the reel 24 is smaller; when the diameter of the reel 24 is smaller, the angle of rotation of the reel 24 is larger. In this way, the diameter of the reel 24 may be configured according to actual usage requirements; for example, the reel 24 with a smaller diameter may be selected, and the overall volume of the adjusting device 2 may be reduced.

[0094] In order to enable the backrest 11 to stay in the upright position, the lying position, or a suitable position between the two, the reel 24 is provided with a positioning member that rotates coaxially, and the adjusting device 2 is further provided with a locking member 100 that cooperates with the positioning member.

[0095] In an embodiment shown in FIGS. 3, 6B, HAand 12A, the positioning member is a ratchet 244 for unidirectional positioning. However, the present disclosure is not limited thereto, and the positioning member may also be a gear 246 for bidirectional positioning (see FIGS. 11B and 12B) or other mechanisms with engagement grooves or engagement protrusions, as long as the positioning member can realize positioning after engaging with the locking member 100 and can move after disengaging from the locking member 100.

[0096] An example in which the positioning member is the ratchet 244 for unidirectional positioning will be describe below.

[0097] To rotate the ratchet 244 coaxially with the reel 24, in an embodiment shown in FIG. 6B, the ratchet 244 is attached to the second disc 24B of the reel 24. However, the present disclosure is not limited thereto. For example, instead of providing a separate ratchet 244, the second disc 24B of the reel 24 may be made into a ratchet. Certainly, other forms of positioning members may be disposed on the reel 24 in the same manner.

[0098] As shown in FIG. 11 A, rotation of the ratchet 244 in the unwinding direction D2 is selectively blocked by the locking member 100, so that the reel 24 cannot rotate in the unwinding direction D2; however, rotation of the ratchet 244 in the winding direction DI is not blocked by the locking member 100. As shown in FIG. 11 A, when the rotation of the ratchet 244 on the reel 24 in the unwinding direction D2 is blocked by the locking member 100, the reel 24 cannot rotate in the unwinding direction D2 either, the adjusting device 2 is in a locked state, and the ratchet 244 can only rotate in the winding direction DI, so that the backrest 11 can only freely pivot towards the upright position to a suitable position and stay at the suitable position, but cannot pivot towards the lying position.

[0099] As shown in FIG. 12A, when the locking member 100 moves to an unlocking position so that the rotation of the ratchet 244 on the reel 24 in the unwinding direction D2 is no longer blocked by the locking member 100, the adjusting device 2 is in an unlocked state, and the ratchet 244 can rotate in the winding direction DI or in the unwinding direction D2. As a result, the backrest 11 can not only pivot towards the upright position to a suitable position, but also pivot towards the lying position to a suitable position. After the backrest 11 pivots towards the upright position or the lying position to the suitable position, rotation of the ratchet 244 on the reel 24 in the unwinding direction D2 will be again blocked by the locking member 100 as long as the locking member 100 is returned to a locking position as shown in FIG. 11 A, and the backrest 11 will stay at the suitable position. Through cooperation of the ratchet 244 with the locking member 100, the adjusting device 2 according to the present disclosure can realize unidirectional locking and unidirectional unlocking of the pivoting of the backrest 11 towards the lying position.

[00100] It should be understood that the rotation of the ratchet 244 in the unwinding direction D2 is selectively blocked by the locking member 100, but the present disclosure is not limited thereto.

[00101] In another embodiment (not shown), the ratchet 244 may be arranged in a reverse manner. For example, the ratchet 244 is arranged in such a way that an engagement orientation of ratchet teeth is opposite to an engagement orientation shown in FIGS. 11A and 12A, so that rotation in the winding direction DI is selectively blocked by the locking member 100, but rotation of the ratchet 244 in the unwinding direction D2 is not blocked by the locking member 100. This embodiment differs from the embodiment shown in FIGS. 11A and 12A in that when the rotation of the ratchet 244 on the reel 24 in the winding direction DI is blocked by the locking member 100, the reel 24 cannot rotate in the winding direction DI, the adjusting device 2 is in the locked state, and the ratchet 244 can only rotate in the unwinding direction D2, so that the backrest 11 can only freely pivot towards the lying position to a suitable position and stay at the suitable position, but cannot pivot towards the upright position. When the locking member 100 moves to the unlocking position such that the rotation of the ratchet 244 on the reel 24 in the winding direction DI is no longer blocked by the locking member 100, the adjusting device 2 is in the unlocked state, and the ratchet 244 can rotate in the winding direction DI and also rotate in the unwinding direction D2, so that the backrest 11 can not only pivot towards the upright position to a suitable position, but also pivot towards the lying position to a suitable position. After the backrest 11 pivots towards the upright position or the lying position to the suitable position, rotation of the ratchet 244 on the reel 24 in the winding direction DI will be again blocked by the locking member 100 as long as the locking member 100 is returned to the locking position, and the backrest 11 will stay at the suitable position.

[00102] In yet another embodiment, the positioning member is the gear 246 for bidirectional positioning (see FIGS. 11B and 12B) or other mechanisms with engagement grooves or engagement protrusions. That is, the positioning member is configured in such a way that rotation in either of the winding direction DI and the unwinding direction D2 is selectively blocked by the locking member 100. This embodiment differs from the embodiment using the ratchet 244 in that when the rotation of the positioning member on the reel 24 is blocked by the locking member 100, as shown in FIG. 11B, the reel 24 can rotate neither in the winding direction DI nor the unwinding direction D2, and the adjusting device 2 is in the locked state. When the locking member 100 moves to the unlocking position such that the rotation of the positioning member on the reel 24 is no longer blocked by the locking member 100, as shown in FIG. 12B, the adjusting device 2 is in the unlocked state, and the positioning member can rotate in the winding direction DI and in the unwinding direction D2, so that the backrest 11 can not only pivot towards the upright position to a suitable position, but also pivot towards the lying position to a suitable position. After the backrest 11 pivots towards the upright position or the lying position to the suitable position, as long as the locking member 100 is returned to the locking position, as shown in FIG. 11B, rotation of the positioning member on the reel 24 will be again blocked by the locking member 100, and the backrest 11 will stay at the suitable position.

[00103] The locking member 100 is configured to be movable between the locking position and the unlocking position. In the locking position, the locking member 100 blocks the backrest 11 from pivoting. In the unlocking position, the locking member 100 does not block the backrest 11 from pivoting.

[00104] In the illustrated embodiments, the motion of the locking member 100 is a pivoting motion. However, the motion of the locking member 100 may also be a sliding motion, or a combined motion of a pivoting motion and a sliding motion.

[00105] Specifically, as shown in FIGS. 11A and 12A, a connection side 101 of the locking member 100 is pivotally connected to a connection portion 232 on the inner cover 23, so that a free side 102 of the locking member 100 can pivot relative to the connection portion 232. FIGS. 11A and 12A show schematic views of the locking member 100 in the locking position and the unlocking position, respectively. As shown in FIG. 11 A, when the free side 102 of the locking member 100 pivots to the locking position, an engaging portion 103 at the free side 102 of the locking member 100 engages with the ratchet teeth on the ratchet 244, thereby blocking the ratchet 244 from rotating in the unwinding direction D2. As shown in FIG. 12A, when the free side 102 of the locking member 100 pivots to the unlocking position, the engaging portion 103 of the locking member 100 disengages from the ratchet teeth on the ratchet 244, thereby not blocking the ratchet 244 from rotating in the unwinding direction D2.

[00106] Certainly, the locking member 100 according to the present disclosure is not limited thereto, and the locking member 100 may also be configured to slide up and down along a slide rail (not shown) on the inner cover 23, so that the engaging portion 103 of the locking member 100 can engage with or disengage from the ratchet teeth on the ratchet 244, and at this time, the motion of the locking member 100 is a sliding motion.

[00107] As shown in FIGS. 11A and 12A, the adjusting device 2 may include an elastic member 28 configured to drive the locking member 100 to move to the locking position, so that the locking member 100 tends to block the ratchet 244 from rotating in the unwinding direction D2. In the embodiment shown in FIGS. 11A and 12A, the elastic member 28 is a torsion spring disposed around the connection side 101 of the locking member 100, and one end 281 of the torsion spring abuts against an inner upper wall of the inner cover 23, while another end 282 is connected to a protrusion 104 in the middle of the locking member 100.

[00108] Certainly, the elastic member 28 may also take various forms such as a tension spring, a compression spring, an elastic rope or an elastic body, as long as it can drive the locking member 100 to move to the locking position.

[00109] In a case where the positioning member is the ratchet 244 for unidirectional positioning, when the user adjusts the backrest 11 of the stroller 1 by pivoting it towards the lying position, the reel 24 will rotate in the unwinding direction D2, but the locking member 100 tends to block the ratchet 244 and the reel 24 from rotating in the unwinding direction D2 under the action of an elastic force of the elastic member 28. Consequently, the user needs to first operate the locking member 100 to move it to the unlocking position and keep the locking member 100 in the unlocking position (i.e., the adjusting device 2 changes from the locked state to the unlocked state and remains in the unlocked state), and then can pull the backrest 11 of the stroller 1 to pivot towards the lying position.

[00110] Unlocking Mechanism

[00111] In order to facilitate the operation of the user, the present disclosure provides an unlocking mechanism for causing the adjusting device 2 to change into the unlocked state, thereby releasing the positioning of the backrest 11 and enabling the backrest 11 to pivot.

[00112] The unlocking mechanism may be used to release relative positioning between the first member 11 and the second member 12, and includes a locking member 100 configured to be movable between a locking position where the locking member 100 blocks relative motion between the first member and the second member and an unlocking position where the locking member 100 does not block relative motion between the first member and the second member.

[00113] In order to facilitate operation of the locking member 100 by the user, in an embodiment, the unlocking mechanism may further include an operating member configured to directly or indirectly drive the locking member 100 to move to the unlocking position under an external force. Here, the term “directly” means that the operating member is in direct contact with and acts on the locking member 100. The term “indirectly” means that the operating member is not in direct contact with the locking member 100, but force is transmitted therebetween via other members.

[00114] In an embodiment, the unlocking mechanism may include a driving member 200, and a first end 201 of the driving member 200 is connected to the locking member 100 while a second end 202 thereof is connected to the operating member. The operating member is configured to drive the locking member 100 to move to the unlocking position via the driving member 200 under an external force. The driving member 200 enables the locking member 100 and the operating member to be separated by a certain distance, thereby allowing for more flexible arrangement of the operating member.

[00115] Certainly, the present disclosure is not limited thereto. In another embodiment, the unlocking mechanism may not include the operating member or the driving member 200, and the user directly applies an external force to the locking member 100 to move the locking member 100 to the unlocking position.

[00116] The operating member may be a pull handle 300 (see FIGS. 2 and 3) which is pulled to drive the driving member 200 to move, or may be a slide handle 300” (see FIGS. 13 to 19) which slides on a fixing base 500 to drive the driving member 200 to move.

[00117] For ease of description, an example, where the operating member is the slide handle 300”, the positioning member is the ratchet 244 for unidirectional positioning, and the unlocking mechanism is a unidirectional unlocking mechanism that realizes unlocking only when the pivoting of the backrest 11 towards the lying position is blocked, will be described below with reference to the accompanying drawings.

[00118] As shown in FIGS. 13 to 24, in this embodiment of the unlocking mechanism, the driving member 200 is a flexible member, and the first end 201 of the driving member 200 is connected to the locking member 100, while the second end 202 of the driving member 200 is connected to the slide handle 300”. The slide handle 300” and the driving member 200 may be two independent components, or may be an integrally formed single component. The slide handle 300” drives the driving member 200 to move, thereby driving the locking member 100 to move to the unlocking position.

[00119] The driving member 200 may be a flexible member capable of withstanding a pulling force, such as but not limited to a webbing, a pull rope, or a metal wire.

[00120] In order to enable the driving member 200 to enter an interior of the adjusting device 2 from an exterior thereof to connect with the locking member 100, the driving member 200 may pass through a through hole 233 (see FIG. 14) in the inner cover 23. The position of the through hole 233 in the inner cover 23 is preferably formed to correspond to the locking member 100, so that the driving member 200 passes through the through hole 233 to connect with the locking member 100.

[00121] In an embodiment shown in FIGS. 13-19, the adjusting device 2 and the fixing base 500 are two separate members. The slide handle 300” is connected to the flexible driving member 200 and configured to drive the driving member 200 to move, so that the locking member 100 is driven by means of the driving member 200 to move to the unlocking position, and the adjusting device 2 is changed into the unlocked state.

[00122] In the embodiment shown in FIGS. 13-19, the slide handle 300” is slidably disposed on the fixing base 500, and the fixing base 500 is disposed on the backrest 11 through a fixing pin 600. Moreover, the slide handle 300” is correspondingly provided with an elongated sliding groove 303” through which the fixing pin 600 passes. The sliding groove 303” slides relative to the fixing pin 600, so that the sliding of the slide handle 300” relative to the fixing base 500 is limited within a range of the sliding groove 303”, thereby preventing the slide handle 300” from being separated from the fixing base 500.

[00123] In the embodiment shown in FIGS. 13-19, a reset spring 504 is provided between the fixing base 500 and the slide handle 300”, and the reset spring 504 is configured to drive the slide handle 300” to return to an initial position where the driving member 200 is not driven. Although the reset spring 504 in this embodiment is a compression spring disposed in the sliding groove 303”, the present disclosure is not limited thereto, and the reset spring 504 may be a tension spring, a torsion spring or other elastic members and may be disposed in other suitable positions capable of driving the slide handle 300” back to the initial position.

[00124] In order to facilitate operation of the slide handle 300” by the user, in the embodiment shown in FIGS. 13-19, the slide handle 300” may be designed to have a force-applying portion (i.e., an operating member force-applying portion) 304” horizontally extending (i.e., extending in a direction perpendicular to a movement direction of the slide handle 300” and away from the backrest 11), and the operating member force-applying portion 304” is shaped like a trigger.

[00125] When the user prepares to adjust an angle of the backrest 11 of the stroller 1, the user may first hook the operating member force-applying portion 304” of the slide handle 300” with a finger, and apply an external force to the operating member force-applying portion 304” to slide the slide handle 300” relative to the fixing base 500, so that the slide handle 300” drives, via the driving member 200, the locking member 100 of the adjusting device 2 to move to the unlocking position, and hence the adjusting device 2 is changed into the unlocked state, and then the backrest 11 changes its inclination angle (the backrest 11 is not limited to the pivoting motion).

[00126] Safety Lock Member of Unlocking Mechanism

[00127] In a situation, if the positioning member on the reel 24 in the adjusting device 2 is the ratchet 244 for unidirectional positioning, when the stroller 1 equipped with the adjusting device 2 passes over uneven or obstructed ground, the stroller may be jolted due to impact from the ground, and the backrest 11 of the stroller 1 may jump out of position. This is because the ratchet 244 and the reel 24 on which the ratchet 244 is located vibrate along with the stroller 1, and in this process, the rotation of the ratchet 244 in the winding direction DI is not blocked by the locking member 100, and the clockwork spring 25 within the reel 24 tends to cause the ratchet 244 and the reel 24 on which the ratchet 244 is located to rotate in the winding direction DI, so that the reel 24 may rotate in the winding direction DI due to vibration and wind the tether 240. As a result, the effective length of the tether 240 required to carry the backrest 11 becomes shorter, causing the backrest 11 of the stroller 1 to move towards the upright position, making the backrest 11 jump out of position, which may pose potential safety hazards and frighten babies.

[00128] The backrest 11 of the stroller 1 may move towards the upright position to an angle of less than 150 degrees relative to the seating portion 12 as a result of automatically jumping out of position. This situation is not favorable for babies aged 0-6 months, so the problem that the backrest 11 automatically jumps out of position needs to be overcome.

[00129] In another situation, the user may misoperate the operating member such as the pull handle 300 or the slide handle 300”, causing the adjusting device 2 to accidentally change to the unlocked state, thereby posing an unintentional danger.

[00130] In order to overcome these problems and enable the relative positioning between the two members to be reliably maintained or released, the unlocking mechanism according to the present disclosure may further include a safety lock member SI00 configured to be movable between a safety locking position and a safety unlocking position. In the safety locking position, the safety lock member SI00 blocks the relative motion between the first member 11 and the second member 12. When the locking member 100 is in the unlocking position and the safety lock member SI00 is in the safety unlocking position, the first member 11 and the second member 12 can move relative to each other.

[00131] In the unlocking mechanism according to the present disclosure, by double locking of the locking member 100 and the safety lock member S100, even if one of the locking member 100 and the safety lock member SI00 is accidentally unlocked, the other one of the locking member 100 and the safety lock member SI00 can remain locked, thereby effectively preventing the adjusting device 2 from accidentally changing to the unlocked state, and further avoiding accidental relative motion between the first member 11 and the second member 12, thereby avoiding the problem that the backrest (i.e., the first member) 11 jumps out of position or the user’s misoperation.

[00132] FIGS. 13-36 illustrate an embodiment of an unlocking mechanism provided with a locking member 100 and a safety lock member SI00. Similar to the working principles of the locking member 100 described above, the safety lock member S100 may block or not block the rotation of the reel 24 of the adjusting device 2, thereby blocking or not blocking the relative motion between the first member 11 and the second member 12.

[00133] Specifically, as shown in FIG. 14, the adjusting device 2 including the unlocking mechanism may include a first outer cover 21, a second outer cover 22, and an inner cover 23 between the first outer cover 21 and the second outer cover 22. As shown in FIGS. 2 and 3, the adjusting device 2 may be fixed to the first member 11 by a fixing member (e.g. a screw) sequentially passing through a connector 26, a backrest plate of a backrest (i.e., the first member) 11 and a hole in the second outer cover 22 and being screwed to a screw column on the inner cover 23 and a screw column on the first outer cover 21. However, the present disclosure is not limited thereto. In another embodiment, two or three of the first outer cover 21, the second outer cover 22, and the inner cover 23 may be an integrally formed member. In yet another embodiment, the first outer cover 21 may be omitted.

[00134] The adjusting device 2 may further include a reel 24, and the reel 24 is disposed to be rotatable between the inner cover 23 and the second outer cover 22, so that a tether 240 (which is not shown in FIGS. 13-36 for the sake of clarity) is wound on the reel, and two ends of the tether 240 extend out of the adjusting device 2 and are immobilized relative to the second member 12 (e.g., fixed to the frame 13 of the stroller 1 as shown in FIG. IC). As described above, the reel 24 winds or unwinds, by its own rotation, a part of the tether 240, thereby changing an effective length of the tether 240, and an increase or decrease in the effective length of the tether 240 can adjust a position to which the first member 11 moves relative to the second member 12.

[00135] In order to enable the safety lock member SI00 to block or not block the rotation of the reel 24, as shown in FIGS. 14, 19, 21-24, 34 and 36, the reel 24 is provided with a plurality of reel engaging structures 248, and the safety lock member SI00 is provided with a safety lock engaging structure S101 (see FIGS. 20 and 32).

[00136] When the safety lock member SI00 moves to the safety locking position, as shown in FIGS. 21, 23 and 34, the safety lock engaging structure SI01 is engaged with one of the reel engaging structures 248, so as to block the rotation of the reel 24.

[00137] When the safety lock member SI00 is moved to the safety unlocking position, as shown in FIGS. 22, 24 and 36, the safety lock engaging structure SI01 is disengaged from the reel engaging structure 248, so as not to block the rotation of the reel 24.

[00138] In the embodiment shown in FIGS. 14, 19, 21-24, 34 and 36, the reel 24 is provided with a ratchet 244 rotating coaxially, and the plurality of reel engaging structures 248 are inner teeth on the ratchet 244.

[00139] Certainly, the present disclosure is not limited thereto.

[00140] The reel 24 may also be provided with a gear 246 rotating coaxially (see FIGS. 1 IB and 12B), and the plurality of reel engaging structures 248 are inner teeth on the gear 246.

[00141] Additionally, the plurality of reel engaging structures 248 may be teeth disposed on another coaxially rotating ratchet or gear of the reel 24, or may be grooves or protrusions disposed on the reel 24.

[00142] In order to facilitate the operation of the safety lock member SI00, as shown in FIGS. 14-19, 31, 34 and 36, the adjusting device 2 may be provided with a safety lock elastic member SI02 configured to exert an elastic force on the safety lock member SI00, to drive the safety lock engaging structure SI01 to engage with one of the reel engaging structures 248, so that the safety lock member SI 00 tends to block the rotation of the reel 24.

[00143] In the embodiment shown in FIGS. 14-19, 31, 34 and 36, the safety lock elastic member SI02 is a compression spring.

[00144] In order to ensure that the compression spring as the safety lock elastic member SI02 acts on the safety lock member SI00 along a direction of driving the safety lock engaging structure SI01 to engage with the reel engaging structure 248, the safety lock member SI00 may be provided with an elastic member fixing portion SI03, to allow the safety lock elastic member SI02 to be sleeved thereon, thereby reasonably positioning the safety lock elastic member SI02.

[00145] In the embodiment shown in FIGS. 14-19 and 31, a motion of the safety lock member SI00 between the safety locking position and the safety unlocking position is a vertical motion, and in order to avoid deviation of the safety lock member SI00, the inner cover 23 is provided with a safety lock guiding portion 23A for guiding the safety lock member SI00 to move therein.

[00146] It should be understood that the safety lock guiding portion 23A may also be disposed on the first outer cover 21 or the second outer cover 22.

[00147] To facilitate operation of the safety lock member SI00 by the user, the unlocking mechanism may include a safety lock operating member operable to drive the safety lock member SI00 to move to the safety unlocking position.

[00148] Specifically, in an embodiment shown in FIGS. 13-28, the safety lock operating member is a rotary knob S300, and in an embodiment shown in FIGS. 29-36, the safety lock operating member is a push button S300’. Certainly, the safety lock operating member may also be other members as long as it can be operated to drive the safety lock member SI00 to move to the safety unlocking position.

[00149] The safety lock operating member S300, S300’ is movably disposed on the first member 11 and can move between an operating member locking position and an operating member unlocking position. In the operating member locking position, the safety lock operating member S300, S300’ allows the safety lock member S100 to remain in the safety locking position. In the operating member unlocking position, the safety lock operating member S300, S300’ drives the safety lock member SI00 to move to the safety unlocking position.

[00150] It should be understood that the safety lock operating member S300, S300’ may also be disposed on the second member 12 or other members.

[00151] In an embodiment, the unlocking mechanism may include a safety lock traction member S200 having one end connected to the safety lock member SI00 and another end connected to the safety lock operating member S300, S300’, so that the safety lock operating member S300, S300’ can drive the safety lock member S100 via the safety lock traction member S200. The safety lock traction member S200 allows the safety lock member SI00 and the safety lock operating member S300, S300’ to be separated by a certain distance, thereby allowing for more flexible arrangement of the safety lock operating member S300, S300’.

[00152] In an embodiment shown in FIGS. 14-28 and 29-36, the safety lock traction member S200 includes a traction wire S220 and a sheath S210 in which the traction wire S220 slides.

[00153] It should be understood that the safety lock traction member S200 may adopt other forms of embodiments; for example, the safety lock traction member S200 may adopt a separate traction wire S220 without a sheath S210, or may adopt a rod-shaped member or the like.

[00154] The traction wire S220 may be a flexible member capable of withstanding a pulling force, such as but not limited to a webbing, a pull rope, or a metal wire.

[00155] In an embodiment, there may be at least two sheaths S210 located near two ends of the safety lock traction member S200 respectively and fixed separately to guide a traction direction of the traction wire S220.

[00156] It should be understood that the sheath S210 may also be a single tubular member surrounding a majority of the traction wire S220, and two ends of the tubular member are fixed separately to guide the traction direction of the traction wire S220.

[00157] As shown in FIGS. 14-16 and 31, the inner cover 23 may be provided with a sheath fixing portion 23B, to fix the sheath S210 at an end, which is connected to the safety lock member SI 00, of the safety lock traction member S200.

[00158] Depending on the requirements, the inner cover 23 may be provided with a channel through which the traction wire S220 passes.

[00159] To facilitate connection of the traction wire S220 with the safety lock member S100 and / or the safety lock operating member S300, S300’, as shown in FIG. 25, a traction wire heads S221 may be provided at each of both ends of the traction wire S220. A diameter of the traction wire head S221 is larger than a diameter of the traction wire S220.

[00160] Correspondingly, as shown in FIGS. 14, 16, 26 and 31, at least one of the safety lock member SI00 and the safety lock operating member S300, S300’ may be provided with a traction member fixing portion S230. The traction member fixing portion S230 can accommodate the traction wire head S221, and a traction member channel S240 is provided on a side wall of the traction member fixing portion S230. A width of the traction member channel S240 is smaller than the diameter of the traction wire head S221 but larger than the diameter of the traction wire S220, to allow the traction wire S220 connected with the traction wire head S221 to extend out of the traction member fixing portion S230 through the traction member channel S240, thereby realizing connection of the traction wire S220 with the safety lock member S100 and / or the safety lock operating member S300 and S300’.

[00161] In an embodiment in which there is one traction wire S220, as shown in FIGS. 14-28, the safety lock member SI00 may be correspondingly provided with one traction member fixing portion S230. In an embodiment in which there are two traction wires S220, as shown in FIGS. 29-36, the safety lock member SI00 may be correspondingly provided with two traction member fixing portions S230.

[00162] In the embodiment shown in FIG. 14, since the elastic member fixing portion SI03 is located in an extension direction of the traction member channel S240, the traction member channel S240 runs through the elastic member fixing portion SI03, so that the traction wire S220 can extend out of the traction member fixing portion S230.

[00163] Certainly, the present disclosure is not limited thereto. In another embodiment, the unlocking mechanism may not include the safety lock operating member S300, S300’ or the safety lock traction member S200, and the user directly applies an external force to the safety lock member SI00 to move the safety lock member SI00 to the unlocking position.

[00164] Two embodiments of the safety lock operating member S300, S300’ of the unlocking mechanism will be described in detail below with reference to the drawings.

[00165] First Embodiment of Safety Lock Operating Member

[00166] A first embodiment of the safety lock operating member is a rotary knob S300 as shown in FIGS. 13-28.

[00167] In an embodiment, the rotary knob S300 is rotatably mounted to the fixing base 500, and the fixing base 500 is connected to the first member 11.

[00168] It should be understood that the rotary knob S300 may also be rotatably mounted directly to the first member 11 rather than disposed on the fixing base 500.

[00169] In addition, although the rotary knob S300 shown in FIGS. 13-28 is pivotal, the rotary knob S300 may also be a self-rotating knob, and one end of the safety lock traction member S200 may be wound on the knob, so that the safety lock traction member S200 is driven by the self-rotation of the knob.

[00170] In an embodiment shown in FIG. 25, a fixed pivot shaft 510 is provided at top of the fixed base 500, and the rotary knob S300 is pivotally connected to the fixed pivot shaft 510, so that the user can conveniently apply a force to the rotary knob S300, to cause the rotary knob S300 to pivot around the fixed pivot shaft 510 between the operating member locking position and the operating member unlocking position, thereby driving the safety lock traction member S200.

[00171] To facilitate connection of the traction wire S220 with the rotary knob S300, in an embodiment shown in FIG. 26, the rotary knob S300 may be provided with the traction member fixing portion S230 and the traction member channel S240, the traction member fixing portion S230 may accommodate the traction wire head S221, and the traction member channel S240 allows the traction wire S220 to pass therethrough.

[00172] The sheath S210 at an end, which is connected to the rotary knob S300, of the safety lock traction member S200 may be fixed to the fixing base 500.

[00173] The fixing base 500 may be provided with a safety lock retainer S310 that is movable and configured to retain the rotary knob S300 in the operating member unlocking position.

[00174] In order to facilitate motion of the safety lock retainer S310, as shown in FIG. 25, the fixing base 500 may be provided with a retainer accommodating portion 520 for the safety lock retainer S310 to slide therein.

[00175] Certainly, the safety lock retainer S310 may also be arranged to pivot on the fixing base 500.

[00176] In an embodiment shown in FIGS. 25, 27 and 28, the safety lock retainer S310 is provided with a retainer blocking structure S312, and the rotary knob S300 is provided with a rotary knob blocking structure S301 that can engage with the retainer blocking structure S312 to retain the rotary knob S300 in the operating member unlocking position, as shown in FIG. 28.

[00177] As shown in FIGS. 27 and 28, the rotary knob blocking structure S301 may exhibit a stepped shape, and the retainer blocking structure S312 may exhibit a raised shape (see FIG. 25) cooperating with the step, so that the engagement of the two can block the pivoting of the rotary knob S300.

[00178] In order to keep the rotary knob blocking structure S301 engaged with the retainer blocking structure S312, the unlocking mechanism may be further provided with a retainer elastomer S311 configured to drive the safety lock retainer S310 to abut against the rotary knob S300.

[00179] In the embodiment shown in FIG. 25, the retainer elastomer S311 may employ a compression spring disposed in the retainer accommodating portion 520 to apply an elastic force to the safety lock retainer S310.

[00180] In the embodiment shown in FIGS. 25, 27 and 28, the rotary knob S300 may also be provided with another rotary knob blocking structure S302 that can engage with the retainer blocking structure S312 to retain the rotary knob S300 in the operating member locking position, as shown in FIG. 27.

[00181] Certainly, the present disclosure is not limited thereto.

[00182] The safety lock retainer S310 may adopt other structures. For example, the safety lock retainer S310 may be a pin having one end inserted into a recess on the rotary knob S300 to retain the rotary knob S300 in the operating member unlocking position or the operating member locking position.

[00183] When the user applies no force to the rotary knob S300, as shown in FIGS. 21, 22 and 27, the rotary knob S300 is in the operating member locking position, and the safety lock member SI00 is in the safety locking position so that the safety lock engaging structure SI01 thereof engages with one of the reel engaging structures 248 on the ratchet 244 (see FIG. 22). As a result, the ratchet 244 is blocked from rotating, and the adjusting device 2 is in the locked state. Moreover, the safety lock elastic member SI02 retains the safety lock member SI00 in the safety unlocking position, and the retainer blocking structure S312 of the safety lock retainer S310 engages with another rotary knob blocking structure S302 on the rotary knob S300 to retain the rotary knob S300 in the operating member locking position (see FIG. 27).

[00184] When the user applies a force to the rotary knob S300, the force needs to overcome the elastic force of the safety lock elastic member SI02 and of the retainer elastomer S311 in order to pivot the rotary knob S300 to the operating member unlocking position, as shown in FIGS. 23, 24 and 28. The motion of the rotary knob S300 is transferred to the safety lock member SI00 via the safety lock traction member S200, so that the safety lock member SI 00 moves to the safety unlocking position, then the safety lock engaging structure SI 01 of the safety lock member SI00 is disengaged from the reel engaging structure 248 (see FIG. 24), and thus the ratchet 244 is not blocked by the safety lock member SI00. At this time, if the locking member 100 is in the unlocking position without blocking the ratchet 244, the ratchet 244 and the reel 24 where the ratchet 244 is located can rotate, and the adjusting device 2 is in the unlocked state. After the rotary knob S300 pivots to the operating member unlocking position, the retainer blocking structure S312 of the safety lock retainer S310 engages with the rotary knob blocking structure S301 on the rotary knob S300, to retain the rotary knob S300 in the operating member unlocking position (see FIG. 28).

[00185] If the user no longer applies force to the rotary knob S300, the rotary knob S300 will remain in the operating member unlocking position (see FIG. 28).

[00186] Afterwards, when the user applies a force in a reverse direction to the rotary knob S300, the force only needs to overcome an elastic force of the retainer elastomer S311 to pivot the rotary knob S300 towards the operating member locking position, until the retainer blocking structure S312 of the safety lock retainer S310 engages with another rotary knob blocking structure S302 on the rotary knob S300, to retain the rotary knob S300 in the operating member locking position, as shown in FIG. 27.

[00187] At the same time, the pivoting of the rotary knob S300 towards the operating member locking position causes the safety lock traction member S200 to no longer exert a force on the safety lock member SI00. Hence, the safety lock member SI00 moves towards the safety locking position under the elastic force of the safety lock elastic member SI02 until the safety lock engaging structure SI01 engages with one of the reel engaging structures 248, and the adjusting device 2 returns to the locked state.

[00188] Second Embodiment of Safety Lock Operating Member

[00189] A second embodiment of the safety lock operating member is a push button S300’ slidably mounted to the first member 11 as shown in FIGS. 29-36, and the push button S300’ is configured to drive the safety lock member SI00 via the safety lock traction member S200.

[00190] It should be understood that although the push button S300’ shown in FIGS. 29-36 is a button that slides along a direction perpendicular to an extension direction of the first member 11, the push button S300’ may also slide along the extension direction of the first member 11 to drive the safety lock traction member S200.

[00191] In addition, in the embodiment shown in FIG. 29 to FIG. 36, there are two push buttons S300’; correspondingly, there are also two traction wires S220; and the safety lock member SI00 is also correspondingly provided with two traction member fixing portions S230. The two traction wires S220 pull the same safety lock member SI00, to allow for smoother motion of the safety lock member S100.

[00192] However, it should be understood that in the second embodiment of the safety lock operating member, only one push button S300’, one traction wire S220 and one traction member fixing portion S230 may be provided.

[00193] In order to facilitate the sliding of the push button S300’ relative to the first member 11, in an embodiment shown in FIGS. 30-36, the first member 11 may be provided with a push button base S302’ in which the push button S300’ slides.

[00194] In the embodiment shown in FIGS. 33 and 35, a push button transmission member S310’ is provided between the push button S300’ and the safety lock traction member S200, and is configured to transmit the sliding motion of the push button S300’ in a first direction (i.e., a direction perpendicular to the extension direction of the first member 11) to another end of the safety lock traction member S200 moving in a second direction (i.e., a direction parallel to the extension direction of the first member 11).

[00195] It should be understood that the first direction and the second direction may be the same.

[00196] In this embodiment, the push button S300’ may be provided with a push button slope S301’, and the push button transmission member S310’ may be provided with a transmission slope S311’. The push button slope S301’ abuts against the transmission slope S311’, and inclination directions of the two are inclined to a movement direction of the push button S300’.

[00197] In order to facilitate connection of the traction wire S220 of the safety lock traction member S200 with the push button transmission member S310’, in an embodiment shown in FIGS. 33 and 35, the push button transmission member S310’ may be provided with the traction member fixing portion S230 and the traction member channel S240, the traction member fixing portion S230 may accommodate the traction wire head S221, and the traction member channel S240 allows the traction wire S220 to pass therethrough.

[00198] As shown in FIGS. 33 and 35, the sheath S210 at an end, which is connected to the push button S300’, of the safety lock traction member S200 may be fixed to the push button base S302’.

[00199] When the user applies no force to the push button S300’, as shown in FIGS. 33 and 34, the push button S300’ is in the operating member locking position, the push button slope S301’ is at an upper part of the transmission slope S311’ (see FIG. 33), and the safety lock member SI00 is in the safety locking position to allow the safety lock engaging structure SI01 thereof to engage with one of the reel engaging structures 248 on the ratchet 244 (see FIG. 34), so that the ratchet 244 is blocked from rotating, and the adjusting device 2 is in the locked state. Moreover, the safety lock elastic member SI02 retains the safety lock member SI00 in the safety unlocking position.

[00200] When the user presses the push button S300’ to make it slide towards the first member 11, the push button slope S301’ abuts against the transmission slope S311’, and the two interact with each other to slide the push button transmission member S310’ in the first direction parallel to the extension direction of the first member 11. Hence, the push button transmission member S310’ drives the safety lock member SI00 via the safety lock traction member S200.

[00201] As shown in FIGS. 35 and 36, when the push button S300’ slides to the operating member unlocking position, the push button slope S301’ slides to a lower part of the transmission slope S311’ (see FIG. 35), and the motion of the push button S300’ will be transmitted to the safety lock member SI00 via the safety lock traction member S200 to allow the safety lock member SI00 to move to the safety unlocking position, so that the safety lock engaging structure SI01 of the safety lock member SI00 is disengaged from the reel engaging structures 248 (see FIG. 36), and the ratchet 244 is not blocked by the safety lock member SI00. At this time, if the locking member 100 is in the unlocking position without blocking the ratchet 244, the ratchet 244 and the reel 24 where the ratchet 244 is located can rotate, and the adjusting device 2 is in the unlocked state.

[00202] When the user no longer applies force to the push button S300’, the safety lock member SI00 moves to the safety locking position under the elastic force of the safety lock elastic member SI 02, so that the safety lock engaging structure SI 01 is engaged with one of the reel engaging structures 248, and the adjusting device 2 returns to the locked state. Meanwhile, the motion of the safety lock member SI00 drives the push button transmission member S310’ to slide in a second direction opposite to the first direction via the safety lock traction member S200. Hence, the transmission slope S311’ of the push button transmission member S310’ abuts against the push button slope S301’ of the push button S300’, and the two interact with each other to make the push button S300’ return to the operating member locking position.

[00203] Since the features of the present disclosure may be embodied in various forms without departing from the characteristics of the present disclosure, it should also be understood that the above embodiments are not limited to any of the details described above, unless otherwise specified, but should be broadly construed as being within the scope defined by the appended claims. Therefore, all modifications and variations falling into the scope and boundaries of the claims or equivalents of such scope and boundaries should be encompassed by the appended claims.

Claims

1. An unlocking mechanism for releasing relative positioning between a first member and a second member, the unlocking mechanism comprising:a locking member configured to be movable between a locking position and an unlocking position, wherein the locking member in the locking position blocks relative motion between the first member and the second member; anda safety lock member configured to be movable between a safety locking position and a safety unlocking position, wherein the safety lock member in the safety locking position blocks the relative motion between the first member and the second member,wherein the first member and the second member are allowed to move relative to each other when the locking member is in the unlocking position and the safety lock member is in the safety unlocking position.

2. The unlocking mechanism according to claim 1, wherein the unlocking mechanism comprises a safety lock operating member operable to drive the safety lock member to move to the safety unlocking position.

3. The unlocking mechanism according to claim 2, wherein the unlocking mechanism further comprises a safety lock traction member, one end of the safety lock traction member is connected to the safety lock member, and another end of the safety lock traction member is connected to the safety lock operating member, so that the safety lock operating member drives the safety lock member via the safety lock traction member.

4. The unlocking mechanism according to claim 3, wherein the safety lock traction member comprises a traction wire, and a traction wire head is provided at each of two ends of the traction wire,wherein at least one of the safety lock member and the safety lock operating member is provided with a traction member fixing portion, the traction member fixing portion is able to accommodate the traction wire head, and a traction member channel is provided on a side wall of the traction member fixing portion, to allow a traction wire connected to the traction wire head to extend out of the traction member fixing portion through the traction member channel.

5. The unlocking mechanism according to claim 3 or 4, wherein the safety lock operating member is movably disposed on the first member and is movable between an operating member locking position where the safety lock operating member allows the safety lock member toremain in the safety locking position and an operating member unlocking position where the safety lock operating member drives the safety lock member to move to the safety unlocking position via the safety lock traction member.

6. The unlocking mechanism according to claim 5, wherein the safety lock operating member is or comprises a rotary knob rotatably mounted to a fixing base, and the fixing base is connected to the first member.

7. The unlocking mechanism according to claim 6, wherein the fixing base is provided with a safety lock retainer that is movable and configured to retain the rotary knob in the operating member unlocking position.

8. The unlocking mechanism according to claim 7, wherein the safety lock retainer is provided with a retainer blocking structure, and the rotary knob is provided with a rotary knob blocking structure that is engageable with the retainer blocking structure to retain the rotary knob in the operating member unlocking position,wherein the unlocking mechanism is further provided with a retainer elastomer configured to drive the safety lock retainer to abut against the rotary knob.

9. The unlocking mechanism according to claim 8, wherein the rotary knob is further provided with another rotary knob blocking structure that is engageable with the retainer blocking structure to retain the rotary knob in the operating member locking position.

10. The unlocking mechanism according to any one of claims 5 to 9, wherein the safety lock operating member is or comprises a push button slidably mounted to the first member, and the push button is configured to drive the safety lock member via the safety lock traction member.

11. The unlocking mechanism according to claim 10, wherein a push button transmission member is provided between the push button and the safety lock traction member and is configured to transmit a sliding motion of the push button in a first direction to another end of the safety lock traction member moving in a second direction,wherein the first direction and the second direction are same or different.

12. The unlocking mechanism according to claim 11, wherein the push button is provided with a push button slope, the push button transmission member is provided with a transmission slope, the push button slope abuts against the transmission slope, and inclination directions of the push button slope and the transmission slope are inclined to a movement direction of the push button.

13. An adjusting device for adjusting a position to which a first member moves relative to a second member, the adjusting device being disposed on the first member and comprising the unlocking mechanism according to any one of claims 1 to 12.

14. The adjusting device according to claim 13, comprising:a reel configured to be rotatable to allow a tether to be wound on the reel, two ends of the tether extending out of the adjusting device and being fixed relative to the second member, and an increase or decrease in an effective length of the tether enables adjustment of the position to which the first member moves relative to the second member,wherein the reel is provided with a plurality of reel engaging structures, the safety lock member is provided with a safety lock engaging structure, and when the safety lock member moves to the safety locking position, the safety lock engaging structure is engaged with one of the reel engaging structures to block rotation of the reel.

15. The adjusting device according to claim 14, wherein the reel is provided with a ratchet or gear that rotates coaxially, and when the locking member moves to the locking position, an engaging portion of the locking member engages with teeth on the ratchet or gear to block rotation of the ratchet or gear in at least one direction,wherein the plurality of reel engaging structures are inner teeth disposed on the ratchet or gear.

16. The adjusting device according to claim 14 or 15, wherein a safety lock elastic member is provided in the adjusting device, and the safety lock elastic member is configured to drive the safety lock engaging structure to engage with one of the reel engaging structures.

17. A stroller with a seat, wherein the stroller is provided with the adjusting device according to any one of claims 13 to 16, wherein the unlocking mechanism of the adjusting device is configured to unlock the adjusting device, the first member is a backrest of the seat, and the second member is a seating portion of the seat.

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