CN112918344A - Safety seat - Google Patents

Abstract

The invention relates to a safety seat. The safety seat comprises a seat base, a seat and a drawstring component, wherein one end of a drawstring is connected with a drawstring fixing component, and the other end of the drawstring is connected with an anchor point; the drawstring fixing component comprises a drawstring roll core which is rotationally arranged, and the drawstring roll core rotates to enable the drawstring to be wound on the drawstring roll core so as to extend or shorten the working length of the drawstring; the second locking member of the drawstring locking member is engaged with the first locking member to lock the rotation of the drawstring fixing member to lock the working length of the drawstring, or disengaged from the first locking member to unlock the rotation of the drawstring fixing member to allow the working length of the drawstring to be extended. According to the safety seat, the rotation state of the pull belt roll core is locked by the pull belt locking assembly, so that the working length of the pull belt is locked in the extension process; so as to avoid the potential safety hazard caused by the extension of the working length of the drawstring due to the variety under the normal condition, and can be conveniently pulled out when needing to be extended.

Description

Safety seat

Technical Field

The invention belongs to the technical field of safety seats, and particularly relates to a safety seat with functions of locking and adjusting an upper pull belt.

Background

The safety seat is specially designed for children with different weights or ages, is arranged in an automobile and can effectively improve the riding safety of the children. With the establishment of automobile safety regulations and the development of automobile safety technologies, the design of child safety seats is more and more reasonable, a test method of the child safety seats is introduced in Europe and America, and the design of the child safety seats tends to be mature by the end of the 20 th century. On the basis of the child safety seat fixed by the safety belt, an ISOFIX fixing mode of European standard and an LATCH fixing mode of U.S. standard are developed. In order to protect the safety of children, laws for forcing the use of child safety seats are promulgated by a plurality of countries; when a child rides a car, the child does not sit in the child safety seat, and the child is illegal, so parents are punished.

For safety seats, besides functional requirements such as interface mode, rotation or pitch adjustment, seat stability and crash safety are also important considerations.

In some safety seats, stability is achieved primarily by providing a support member on the base that is supported on the floor of the vehicle. For example, chinese patent CN107161045A discloses a child safety seat, which comprises a base 11 with a wedge-shaped structure and a body 12 disposed thereon, wherein a top bar 13 extending downward and supported on the floor of the vehicle is disposed at the front end of the base 11; and (4) utilizing. Utilize the ejector pin to support in the conflict of leaning against of automobile floor and body and car seat, can form the outrigger at children's safety seat's front and back end, avoid the children's safety seat to overturn under the user state, improved the security. In addition, a similar support leg 12 is disclosed in CN106945576A child safety seat.

In other safety seat constructions that employ a vehicle seatbelt attachment, the stability of the safety seat is limited by the vehicle seatbelt. For example, chinese patent CN102009606A discloses a child safety seat, which comprises a seat belt 31, a seat body 11 and a base 12, wherein the seat body and the base can be selectively in different pitching states according to different relative positions; the seat belt 31 is inserted into the through holes (111, 112, 113) to limit and fix the seat body 11, and the seat body 11 can face forward or backward and the pitch angle can be adjusted accordingly as required.

In other safety seats, the safety and stability of the safety seat are improved by anchoring and fixing the middle upper part of the seat back through the upper pull belt.

For example, chinese patent CN207140871U discloses a tensioning detection system for an upper pulling belt and a child safety seat, where the safety seat includes a seat and an upper pulling belt, a first end of the upper pulling belt is fixed on the seat, a second end of the upper pulling belt is used to be fixedly connected with an anchor point, and the upper pulling belt further includes a tensioning detection system for the upper pulling belt. CN201677766U discloses a connecting and fixing mechanism for a pull-up strap of a child safety seat for a vehicle, wherein a connecting and fixing mechanism composed of a left bracket 2, a right bracket 3 and a cross bar 4 is arranged in the safety seat, a first end of the pull-up strap is fixed on the cross bar 4, and a second end of the pull-up strap extends out of the seat body to be fixedly connected with an anchor point; to ensure that the safety seat is securely attached.

Although the above patents secure the safety seat by means of a support member, a car seat belt, a pull-up strap, etc. to ensure the safety and stability of the safety seat in case of a collision, a bump, etc., they have respective problems.

For the situation that the supporting piece is adopted for fixing the safety seat, the fixing effect is realized to a certain degree mainly through the support of the base, and in practical application, the fixing effect is inferior to that of the latter two; and the support member does not directly act on the seat body, which may cause the structure of the seat body and the base to be damaged by the action of a large impact force at the moment of collision or the like.

In the case of fixing a safety seat by using a car seat belt, a seat belt fixing position or a fixing hole needs to be correspondingly arranged on a seat body, which is generally adopted by a safety seat without an ISOFIX interface or a LATCH interface, and has no direct fixing effect on a base. Moreover, since the child is mobile, it may be possible to pull the car seat belt used to secure the safety seat during riding; this impairs the anchorage of the safety seat, which is based on the unsecured condition if the crash happens right now, since the safety belt is stretched when pulled slowly, and may also be wrapped around the limbs or neck of the child, thus creating a safety hazard.

In the case of fixing the safety seat by using the upper pulling belt, in order to ensure the fixing effect of the upper pulling belt, the upper pulling belt needs to be ensured to be in a tensioned state after the safety seat is fixed to a required position; the desired position includes both the fixed position of the seat when the seat is installed and the position of the safety seat after the adjustment of the seat direction or the pitch angle. Although the traditional upper pull belt has the length telescopic adjusting function, the length adjustment of the traditional upper pull belt is generally required to be carried out near an anchor point, and the length adjustment of the upper pull belt is usually required to be carried out in an automobile trunk in practice.

In practice, the safety seats are often subjected to seat orientation adjustment or pitch angle adjustment during use, and in addition, some safety seats are currently adapted to facilitate the fixing or removal of a child to or from the safety seat, and also to adjust the seat to face the door when the child gets on or off the seat. However, the adjustment mode of the existing upper pull belt is undoubtedly inconvenient at this time, which can significantly increase the operation complexity and reduce the user experience.

Accordingly, there is a need for a safety seat that provides effective pull-up to secure the seat body when the safety seat is in a locked condition, yet is easily lockable to allow seat orientation or pitch adjustment when desired.

Disclosure of Invention

The invention aims to provide a novel safety seat which is provided with an upper drawstring arranged on a seat body so as to directly fix the seat body and improve the safety and the stability; in addition, the length of the upper pull belt of the safety seat is locked under normal conditions and cannot be lengthened, so that the safety reduction caused by the misoperation of children and the danger increase caused by the length extension of the upper pull belt can be avoided; meanwhile, when a user needs to adjust the safety seat to achieve corresponding operations, such as adjusting the seat orientation, adjusting the seat pitch angle, etc., the pull-up strap can be conveniently unlocked to allow the safety seat to be correspondingly adjusted.

As a first aspect of the present invention, there is provided a safety seat comprising a seat base and a seat, the seat comprising a seat portion and a backrest. The safety seat further comprises a drawstring assembly, wherein the drawstring assembly comprises a drawstring, a drawstring fixing assembly and a drawstring locking assembly; the fixed subassembly of stretching strap sets up on the seat, and the first end of stretching strap is connected with the fixed subassembly of stretching strap, and the second end of stretching strap stretches out the seat outside in order to be connected with the anchor point.

The drawstring fixing assembly comprises a drawstring fixing seat and a drawstring roll core rotationally arranged on the drawstring fixing seat, and the drawstring roll core rotates to enable the drawstring to be wound on the drawstring fixing seat so as to extend or shorten the working length of the drawstring (namely the length between the second end of the drawstring and the drawstring roll core); the draw tape locking assembly is movably arranged to lock or unlock at least a rotational state of the draw tape spool rotating that may extend the working length of the draw tape. The drawstring is wound and matched with the drawstring roll core which can be rotatably arranged, so that the working length of the drawstring can be wound or released to be extended or shortened when the drawstring roll core rotates; the drawstring locking assembly can lock the rotation of the drawstring roll core to ensure that the working length of the drawstring can not be extended, and the drawstring roll core rotates to ensure that the working length of the drawstring is shortened, so that the drawstring can be locked by the drawstring roll core or can not be locked by the drawstring roll core to be freely shortened.

The drawstring fixing component comprises a first locking part, and the drawstring locking component comprises a second locking component matched with the first locking part; the first locking part is rotationally arranged along with the drawstring winding core, and the second locking component is movably arranged along with the drawstring locking component; the second locking member is engaged with the first locking member to lock rotation of the drawstring fixing member to lock the working length of the drawstring to be elongated, or disengaged from the first locking member to unlock rotation of the drawstring fixing member to allow the working length of the drawstring to be elongated. When the second locking component is matched with the first locking component, the working length of the drawstring is shortened and is not limited.

According to the safety seat, the first locking member comprises teeth or tooth grooves arranged along the circumferential direction, and the second locking component comprises correspondingly arranged tooth grooves or teeth; the second locking assembly is movably disposed in either a proximal or distal relationship relative to the first locking member and locks the extension of the working length of the draw tape by locking the rotation of the draw tape core in cooperation with the engagement of the teeth with the teeth slots.

According to any one of the above safety seats, the second locking member is reciprocally displaceable in a linear direction so that the teeth or the gullets of the first locking member are engaged with or disengaged from the gullets or the teeth of the second locking member.

The safety seat according to any of the preceding claims, wherein the second locking member is pivotally arranged such that the teeth or gullets of the first locking member engage or disengage with the gullets or teeth of the second locking member.

According to any one of the safety seats, the drawstring locking assembly further comprises a locking spring member, wherein the locking spring member is an elastic element arranged between the drawstring locking assembly and the drawstring fixing seat so as to enable the first locking member to be kept in contact with the second locking assembly.

The safety seat according to any one of the preceding claims, wherein the resilient element is a torsion spring, a compression spring or an extension spring.

According to any one of the safety seats, the drawstring roll core comprises a winding part and a ratchet wheel, the winding part is rotationally arranged on the drawstring fixing seat, and the ratchet wheel is rotationally arranged along with the winding part; the ratchet wheel comprises a ratchet tooth back and a ratchet tooth groove, the ratchet tooth groove is formed into the tooth groove, and a pawl formed into the tooth is arranged on the pull belt locking assembly. An elastic element is arranged between the locking component and the drawstring fixing seat so as to keep the contact trend of the pawl and the ratchet wheel. The elastic element is preferably a torsion spring, a compression spring or an extension spring.

The second locking assembly is rotatably disposed around the pivot shaft to engage or disengage the pawl with or from the ratchet groove; or, the drawstring locking assembly is arranged in a reciprocating displacement way along the linear direction so as to enable the pawl to be matched with or separated from the ratchet groove.

According to any one of the above safety seats, a roll spring is arranged between the drawstring roll core and the drawstring fixing seat, so that the winding part keeps the winding rotation trend. The roll core spring can be a mechanical energy storage mechanism such as a coil spring and a torsion spring, or an active actuating mechanism such as a motor, and aims to carry out winding traction on the pull belt through active actuation or passive energy storage.

According to any one of the above safety seats, the number of the ratchet wheels is two, and the ratchet wheels are respectively located at two ends of the pull belt roll core and fixedly connected with the pull belt roll core so as to rotate along with the pull belt roll core. And a notch is arranged above the drawstring locking assembly to facilitate the winding of the drawstring. In addition, the drawstring fixing seat is preferably provided with a stabilizing rod.

According to any one of the above safety seats, the first locking member is a locking hole arranged along the circumferential direction, and the locking hole is arranged in a penetrating manner or a non-penetrating manner. The lock pin that the stretching set up is locked to the stretching strap subassembly, and the second locks the subassembly and is formed by the front end of lock pin, and the lock pin front end stretches out and cooperates into the lockhole and roll up the core in order to lock the stretching strap for the stretching strap rolls up the core and can not rotate and make the working length extension of stretching strap.

According to any one of the safety seats, the first locking part is a brake disc, the second locking component is a brake caliper, the brake disc is arranged in a manner of rotating along with the drawstring winding core, the brake caliper enables a brake pad of the brake caliper to be in contact friction with the brake disc under the action of the driving mechanism so as to lock the brake disc, and therefore the drawstring winding core is locked so as not to rotate and the working length of the drawstring is extended; namely, the disc brake structure is adopted to lock the pull-strip coil core.

At this time, the caliper is configured to be initially locked, and when the rotation adjustment or the pitch adjustment of the safety seat is to be operated, the caliper is unlocked to be separated from the brake disk so that the pull tape winding core is restored to be rotatably disposed. Obviously, the safety seat with the structure is locked by default, the working length of the pull belt cannot be shortened or extended, and the brake caliper needs to be unlocked in advance to adjust the working length of the pull belt.

According to any one of the safety seats, the first locking part is a brake drum, the second locking component is a brake shoe, the brake drum is rotationally arranged along with the pull belt winding core, and the brake shoe expands under the action of the driving mechanism and is in contact friction with the brake drum to lock the brake drum; thereby locking the drawstring roll core to make it unable to rotate and make the working length of the drawstring extend; namely, the drum brake structure is adopted to lock the pull-strip coil core. At this time, the brake shoes are also configured to be initially locked, which is the same as the disc brake structure described above.

The safety seat adopting the disc brake structure or the drum brake structure to lock the pull belt winding core adopts two friction locking modes, and other modes which have similar structures and adopt friction locking modes are also feasible. In addition, the mode that the lock hole is matched with the lock pin for locking is also bidirectional locking.

According to any one of the above safety seats, the safety seat further comprises a drawstring control, the drawstring control comprising a drawstring locking assembly; the drawstring locking assembly comprises a drawstring, a first end of the drawstring is connected with the drawstring locking assembly to drive the drawstring locking assembly to move, and a second end of the drawstring is formed into an operation end or is connected with a seat operation key.

According to any one of the above safety seats, the strap locking assembly further comprises a pull rod, the pull rod is arranged in a displaceable or pivotable manner, a first end of the pull rod is connected with an operating end of the pull wire, and a second end of the pull rod is connected with the seat operating key.

According to any one of the above safety seats, the pull belt locking assembly further comprises an unlocking operation assembly and a pull rod which can be displaced or pivotally arranged; the first end of the pull rod is connected with the operating end of the second end of the pull wire through the unlocking operating component, and the second end of the pull rod is connected with the seat operating key.

The unlocking operation assembly comprises a brake assembly, the brake assembly comprises a brake piece and a brake fixing piece, the brake piece is hinged to the brake fixing piece, the brake fixing piece is used for fixing the brake piece in a hinged mode, and the brake piece is hinged to the brake fixing piece along one end or the middle of the brake piece; the brake piece is provided with a stay wire connecting end for connecting the operating end of the stay wire and a control connecting end for connecting the first end of the pull rod, the first end of the pull rod is connected with the control connecting end, and the second end of the stay wire is connected with the stay wire connecting end.

According to any one of the above safety seats, a stay wire shell is sleeved outside the stay wire, and the stay wire is sleeved in the stay wire shell; the first end of the cable housing is secured to the brake anchor.

The safety seat according to any one of the preceding claims, wherein the unlocking operation assembly further comprises a guide assembly, and the guide assembly comprises a first displacement member and a second displacement member. The first end of the first displacement piece is connected with the connecting rod so as to be driven by the connecting rod to do translational motion, and the first displacement piece is provided with a guide groove which is obliquely arranged. The second displacement piece is perpendicular to the displacement direction of the first displacement piece and movably arranged in a displaceable mode, a guide piece is arranged on the second displacement piece and matched with the guide groove, and the displacement of the first displacement piece is converted into movable displacement of the second displacement piece through the matching of the guide piece and the guide groove.

According to any one of the above safety seats, the upper end of the second displacement member is formed into a brake control end for matching with the control connection end of the brake member, and the brake control end is connected with or abutted against the control connection end.

The safety seat according to any one of the above, wherein the unlocking operation assembly further comprises a vertical guide member including a movable groove, and the second displacement member is fitted in the movable groove so as to be movable displaceably in a direction in which the movable groove is provided.

The safety seat according to any of the above, wherein the strap attachment assembly is disposed adjacent to the seat bottom, the safety seat further comprising a strap guide; the tape guide includes: the first guide piece is arranged at the lower part of the backrest and positioned at the inner side of the drawstring, the drawstring leading-out piece is positioned at the upper part of the backrest and provided with a drawstring opening so as to lead out the drawstring, and the second guide piece is arranged near the drawstring leading-out piece and positioned at the outer side of the drawstring.

The safety seat according to any one of the preceding claims, said strap guide further comprising: and the third guide piece is arranged near the drawstring leading-out piece and positioned on the inner side of the drawstring.

According to the safety seat, the pull belt locking assembly is arranged to rotate so as to lock the rotating state of the pull belt roll core on which the pull belt is wound, so that the extending process of the working length of the pull belt is controlled; the shortening of the working length of the drawstring can be controlled simultaneously to realize bidirectional locking, or can be uncontrolled and only unidirectional locking.

Compared with the traditional mode of fixing the upper pull belt only in the prior art, the pull belt assembly does not need to open the rear spare compartment to manually adjust the length of the upper pull belt, can obviously reduce the operation complexity, and is very convenient for the adjustment of the orientation required when a child sits on or leaves the seat. Compared with a safety seat fixed by a car safety belt or a safety seat with a safety belt retractor, the stretching of the drawstring is locked under the condition that the configuration is completed, so that the safety belt is prevented from loosening or being pulled out by children when the children play, and corresponding dangers are avoided.

In summary, the safety seat of the present invention adopts the drawstring locking assembly to lock the rotation state of the drawstring roll core, and realizes the locking of at least the working length extension process of the drawstring, thereby avoiding the potential safety hazard caused by extension of the working length of the drawstring due to various reasons under normal conditions, and the safety seat can be conveniently extended when the safety seat needs to be extended, and the adjustment of the orientation or pitching of the seat is very convenient.

Drawings

FIG. 1 is a schematic diagram of a safety seat according to an embodiment of the present invention, which is a perspective view of a rear side view;

FIG. 2 is a schematic illustration of the engagement of the drawstring assembly 200 with the main body of the safety seat in the embodiment of FIG. 1; wherein, the headrest, the seat surface and the like of the safety seat are hidden for the convenience of illustration, and one end of the drawstring locking assembly 230 of the drawstring assembly 200 is disposed upward for the convenience of understanding the structure thereof;

FIG. 3 is a schematic structural diagram of the base in the embodiment of FIG. 1; the drawstring locking assembly 230, the release operating assembly 300 and its associated structures are shown in attached relation to the chassis 11;

FIG. 4 is a schematic view of the primary structure of the drawstring securement assembly 212 of the embodiment of FIG. 1, shown in an unlocked position;

FIG. 5a is a schematic view of the ratchet wheel 222 in the draw tape fixing assembly 212 of FIG. 4; figure 5b is a front view of the ratchet wheel 222,

FIG. 6 is a schematic structural view of the pull strip locking assembly 213 of FIG. 4, wherein the pull strip locking assembly 213 has a pivot member 2131 formed at a lower end thereof for receiving a torsion spring 214, a second locking assembly 224 formed at an upper end thereof, and a pull strip locking assembly 213 further having a pull wire hole 2132 for receiving a first end of a pull wire 231 therein;

FIG. 7 is a schematic illustration of the drawtape securement assembly 212 of FIG. 4 in a locked condition;

FIG. 8 is a schematic view of an attachment structure for the drawstring securement assembly 212 of the embodiment of FIG. 1;

FIG. 9 is a translation set drawtape lock assembly 213 in an alternative embodiment in which the drawtape securement assembly 212 and drawtape lock assembly 213 are the same as the primary structure shown in FIGS. 4-8, except that the drawtape lock assembly 213 is changed from being pivotally set to being translationally set;

FIG. 10 is a schematic diagram of the arrangement of the unlock operation assembly 300 in the embodiment of FIG. 1; other irrelevant components of the base 11 are not shown, only the components related to the unlocking operation assembly 300 are shown, and the unlocking operation assembly 300 and the seat operation key 111 are respectively arranged in the base 11 through the fixing piece 112;

fig. 11 is a schematic connection diagram of the unlocking operation member 300 of fig. 10 and the seat operation key 111, in which parts unrelated to the main function of the unlocking operation member 300 are further hidden;

fig. 12 is a schematic view of the main components of the unlocking operation assembly 300 of fig. 10;

FIG. 13 is an exploded view of FIG. 12; wherein, the unlocking fixing member 310, the pull wire 231 and the pull wire casing 233 are not partially disassembled;

fig. 14 is a schematic view of the second displacement members 322 and 310 engaged with the unlocking manipulating assembly 300 of fig. 10, which is a structural view from a bottom view;

fig. 15 is a structural schematic view of the first displacement member 321 in the unlocking manipulating assembly 300 of fig. 10;

fig. 16 is a structural schematic view of the second displacement member 322 in the unlocking manipulating assembly 300 of fig. 10;

fig. 17 is a structural schematic view of the brake piece 311 in the unlocking manipulating assembly 300 of fig. 10;

FIG. 18 is a schematic view of a pull strap 211 provided in seat 12 in accordance with another embodiment of the present invention;

FIG. 19 is a cross-sectional view of FIG. 18 to facilitate understanding of the manner in which the drawstring is disposed within the seat 12; fig. 20 is a partially enlarged view of fig. 19.

Detailed Description

In order that those skilled in the art will better understand the invention and thus more clearly define the scope of the invention as claimed, it is described in detail below with respect to certain specific embodiments thereof. It should be noted that the following is only a few embodiments of the present invention, and the specific direct description of the related structures is only for the convenience of understanding the present invention, and the specific features do not of course directly limit the scope of the present invention. Such alterations and modifications as are made obvious by those skilled in the art and guided by the teachings herein are intended to be within the scope of the invention as claimed.

A safety seat includes a seat base 11 and a seat 12, the seat 12 including a seat portion 13 and a backrest 14, the seat portion 13 being fitted on the seat base 11 to form the safety seat.

Preferably, the seat portion 13 is rotatably disposed on the seat base 11 such that the seat 12 is rotatably fitted on the seat base 11 to facilitate adjustment of the orientation of the seat as desired. To realize the rotatable arrangement, any one of the known rotatable connecting structures, such as the safety seat base with a rotating function described in CN110497826A, may be adopted.

In other cases, the angle of the backrest 14 can be adjusted, which can be achieved by adjusting the relative angle of the backrest 14 with respect to the seat 13 or by moving the seat 12 as a whole with respect to the seat base 11. The adjusting mechanism of the pitch angle of the backrest is known in the prior art and is not the essential point of the invention of the patent.

Of course, the rotatable arrangement of the seat 12 and the angular adjustment of the backrest 14 are not necessarily independent, and both may be present together; that is, the safety seat can be rotated and the backrest angle can be adjusted. The associated seat rotation mechanism, as well as the seat back angle adjustment mechanism, may be implemented by, but are not limited to, structures known in the art.

For safety seats. For the stability of promotion seat, avoid having adverse effect to the safety seat passenger under special scenes such as car collision, jolt, can supply fixedly in order to overcome this problem through set up the upper stretching strap on the seat.

However, in conventional safety seats, the length of the pull-up strap requires manual adjustment, which may not be convenient in some cases. For example, in the case of the adjusted length of the pull-up strap, if the safety seat is to be rotated, the pull-up strap is usually unfastened or the length of the pull-up strap is adjusted, and after the seat is rotated to a predetermined position, the pull-up strap is fixed again or the length of the pull-up strap is shortened to a suitable length. The above operation is complicated and not friendly enough. Although the above is a description for the rotation process, it is apparent that there is a similar inconvenience in the backrest angle adjustment.

Therefore, the invention provides a novel safety seat which can conveniently complete the length adjustment of the upper pull belt without complex operation.

To achieve the above object, the safety seat further includes a drawstring assembly 200, the drawstring assembly 200 including a drawstring 211, a drawstring fixing assembly 212, and a drawstring locking assembly 213; the pull strap fixing assembly 212 is disposed on the seat 12, a first end of the pull strap 211 is connected to the pull strap fixing assembly 212 to fix one end thereof, and a second end of the pull strap 211 extends out of the seat 12 to be connected to an external fixing point (e.g., a pull strap anchor point on a safety seat on a car seat, which is generally disposed on the back of a rear seat) to fix the safety seat.

The pull tape fixing assembly 212 includes a pull tape fixing seat 201, and a pull tape winding core 220 rotatably disposed on the pull tape fixing seat 201, and the pull tape winding core 220 rotates to wind the pull tape 210 thereon, thereby extending or shortening the working length of the pull tape 211. After the second end of the pull belt 211 is fixed with the external anchor point, for example, the pull belt 211 and the external anchor point are fixedly connected by a hook, and the first end of the pull belt 211 may have length redundancy according to the difference between the orientation and the pitching position of the safety seat; the first end of the redundant draw tape 211 is wound onto the draw tape core 220, and the length from the second end of the draw tape 211 to its winding point on the draw tape core 220 is the working length of the draw tape 211.

The draw tape locking assembly 213 is movably disposed to engage with the draw tape roll core 220 to lock or unlock at least a rotational state in which the draw tape roll core 220 is rotated to extend the working length of the draw tape 211.

The drawstring securing assembly 212 includes a first locking member 223, and the drawstring locking assembly 213 includes a second locking member 224 that cooperates with the first locking member 223; the first locking member 223 is rotatably disposed with the draw tape core 220 and the second locking member 224 is movably disposed with the draw tape locking member 213. The second locking member 224 is engaged with the first locking member 223 to lock the rotation of the draw tape fixing member 212 with the draw tape winding core 220 to lock the working length extension process of the draw tape 211 so that the working length of the draw tape 211 cannot be extended; or disengaged from first locking member 223 to unlock the rotation of draw tape securing assembly 212 to allow the working length of draw tape 211 to be extended, i.e., draw tape securing assembly 212 and draw tape roll core 220 can be rotated to allow the working length of draw tape 211 to be extended after disengagement.

The direction of rotation of the draw tape core 220, which may cause the working length of the draw tape 211 to be shortened, is not limited as to whether the second locking member 224 is engaged with the first locking member 223 or not, i.e., the reverse rotation state of the draw tape core 220 may be locked or unlocked when the second locking member 224 is engaged with the first locking member 223 to lock the working length of the draw tape 211 to be lengthened.

When the draw tape locking assembly 213 locks the draw tape roll core 220 against rotation, the extension of the working length of the draw tape 211 is locked, at which time the length of the draw tape 211 wound on the draw tape roll core 220 is not active; when the pull belt locking assembly 213 does not lock the pull belt winding core 220, the pull belt winding core 220 is in an unlocked state and can rotate freely, and the pull belt winding core 220 of the length of the pull belt 211 rotates clockwise or counterclockwise to extend so as to match the change of the length of the pull belt required by the rotation adjustment of the seat or the adjustment of the pitch angle of the backrest.

Therefore, the retractor assembly 200 of the present invention is different from the retractor of the prior art for the car seat belt, the prior art seat belt retractor can keep retracting the car seat belt into the retractor under the action of the external force due to the action of the coil spring, and when the seat belt is slowly pulled, the retractor rotates to extend the retractor to increase the length; when the belt is pulled quickly, the retractor will be locked from rotation and thus the length of the belt due to the internal mechanism arrangement.

In some embodiments, the first locking member 223 includes circumferentially disposed teeth or splines and the second locking member 224 includes correspondingly disposed splines or teeth. The second locking member 224 is movably disposed in either a proximal or distal direction relative to the first locking member 223, and the elongation of the working length of the draw tape 211 is locked by locking the rotation of the draw tape core 220 via engagement of the teeth with the splines.

In order to make the first locking member 223 and the second locking member 224 cooperate, the second locking member 224 can be arranged in a linear direction in a reciprocating displacement way, so that the teeth or the tooth grooves of the first locking member 223 and the tooth grooves or the teeth of the second locking member 224 are matched or separated; alternatively, the second locking member 224 may be rotatably disposed about a pivot so that the teeth or the gullets of the first locking member 223 are engaged with or disengaged from the gullets or the teeth of the second locking member 224. Both of which can movably dispose the second locking member 224 either proximally or distally relative to the first locking member 223 for the purpose of engaging or disengaging the two.

Preferably, the drawstring locking assembly 213 further comprises a locking spring member, which is an elastic element disposed between the drawstring locking assembly 213 and the drawstring holder 201, so that the first locking member 223 and the second locking member 224 are kept in contact to effectively lock the working length of the drawstring. The elastic element is preferably a torsion spring, a compression spring or an extension spring.

In the locking state of the drawstring locking assembly 213 of the present invention, the working length of the drawstring 211 cannot be extended, which is significantly different from an automobile seat belt retractor; if the subsequent one-way locking mechanism of the invention is matched, the Tianhongbao industry can realize the effect that only the extension process is locked but not the shortening process at the moment.

In certain preferred embodiments, the drawstring locking assembly 213 has a one-way locking function, i.e., the elongation process is locked and the contraction process is free at all.

In order to lock or unlock the pull tape winding core 220 in one direction, the pull tape winding core 220 includes a winding portion 221 and a ratchet wheel 222, the winding portion 221 is rotatably disposed on the pull tape fixing seat 201, and the ratchet wheel 222 is rotatably disposed along with the winding portion 221. The ratchet wheel 222 is provided with a plurality of tooth backs 2201 and a plurality of tooth grooves 2202 along the circumferential direction, the tooth backs 2201 are arranged from the low point of the front tooth groove 2202 to the high point of the rear tooth groove 2202 and extend along the radial direction of the ratchet wheel 222, so that the purpose of unidirectional locking can be realized through corresponding rotation of the ratchet wheel 222; the second locking assembly 224 is a pawl 2241 provided on the pull strip locking assembly 213.

Defining the direction in which the ratchet wheel 222 can freely rotate as a clockwise direction, when the ratchet wheel 222 rotates clockwise, the pawls 2241 slide on the respective tooth backs 2201, which do not lock the rotation of the ratchet wheel 222; when the ratchet wheel 222 is to rotate clockwise, the pawl 2241 is fitted into one of the tooth grooves 2202 to lock the rotation of the ratchet wheel 222.

The first end of the draw tape 211 is fixed to the winding portion 221 and wound accordingly such that the working length of the draw tape 211 is shortened when the ratchet wheel 222 is rotated clockwise; as ratchet wheel 222 rotates counterclockwise, the working length of pull strap 211 is extended. And then the pulling belt winding core 220 is locked in a single direction through the matching of the pawl 2241 and the tooth groove 2202 of the ratchet wheel 222, when the extended pulling belt 211 needs to be operated, the pulling belt winding core 220 can rotate along the anticlockwise direction through applying force to separate the pawl 2241 from the tooth groove 2202.

In cooperation with the ratchet wheel 222 configured to be locked by counterclockwise rotation, when the pulling strip fixing assembly 212 rotates clockwise, the working length of the pulling strip is shortened, and the pawl 2241 slides along the tooth back 2201 during the process, which does not lock the ratchet wheel 222; conversely, when the pull tape winding core 220 is rotated counterclockwise in the reverse direction, the pawl 2241 fits into the tooth groove 2202 to lock the ratchet wheel 222 so that the pull tape winding core 220 is locked from rotating counterclockwise and cannot continue to rotate in the reverse direction, and the working length of the pull tape 211 is locked from extension.

Thus, the draw belt 211 has a basically stable effective length when in work, and the safety seat can be effectively fixed when in collision or bump; and the stretching of the drawstring is locked, so that the actual working length of the drawstring cannot be changed due to misoperation and unauthorized operation, the fixing effect of the drawstring under the special scene can be effectively improved, and the safety is improved. When the effective working length of the pull belt needs to be extended by rotating the seat or adjusting the angle of the backrest, the ratchet 2241 can be separated from the ratchet wheel 222 by operation, so that the ratchet 2241 does not fit into the tooth groove 2202 to lock the ratchet wheel 222 when the ratchet wheel 222 rotates anticlockwise, and at the moment, the pull belt 211 can be pulled by manual force applied to the pull belt 211 or the pull belt 211 is pulled while the seat is rotated or the angle of the backrest is adjusted, so that the pull belt winding core rotates anticlockwise to extend the length of the pull belt.

In some embodiments, a resilient member, such as a torsion spring, a compression spring, an extension spring, etc., is provided between the second locking assembly 224 and the pull strip holder 201 to urge the pawl 2241 into contact with the ratchet wheel 222.

For example, as shown in FIG. 4, in some embodiments, the ratchet wheel 222 is provided in a counterclockwise rotational locking manner, the draw tape locking assembly 213 is pivotally provided on the draw tape holder 201 along a lower end thereof, and a torsion spring 214 is provided between the draw tape locking assembly 213 and the draw tape holder 201 as an elastic member to cause a pawl 2241 at an upper end of the draw tape locking assembly 213 to have a tendency to contact the ratchet wheel 222.

Of course, the torsion spring 214 may be replaced by a tension spring or a compression spring located above the pivot of the pull strip locking assembly 213, or other similar structures, without limitation.

In other preferred embodiments, be equipped with a roll core spring between drawstring roll core 220 and drawstring fixing base 201 to make drawstring roll core 220 keep the trend of clockwise rotation, so that withdrawal of drawstring 211 does not need extra operation, can overcome the elastic force of rolling core spring through external force operation when the drawstring is extended to needs, thereby can reduce the operation, promote user experience. The core spring may be a torsion spring, a coil spring or other devices with similar functions. For example, one side of the drawstring fixing seat 201 is provided with a coil spring 203 as a roll core spring, which can drive the drawstring roll core to rotate so as to shorten the working length of the drawstring; the stabilizer bar 204 is arranged between the left side and the right side of the drawstring fixing component 212 so as to stabilize the whole structure of the drawstring fixing component; and, the two sides of the drawtape holder 201 are respectively provided with a pivot hole 205, and the pivot hole 205 is composed of two symmetrically arranged fan-shaped holes so that the pivotally arranged drawtape locking assembly 213 is fitted therein to realize that the drawtape locking assembly 213 is pivoted to make the pawl 2241 positioned above the same approach or move away from the ratchet wheel 222 to be fitted into or separated from the tooth groove 2202.

In other preferred embodiments, two ratchet wheels 222 are provided, each being located at either end of the pull tape winding core 220 and fixed to the pull tape winding core 220; accordingly, the pull strip locking assembly 213 also has two detents 2241 thereon. The stability of the fixed component of the drawstring in the locking state can be improved by respectively arranging the one-way locking mechanisms of the ratchet pawls at the two ends of the drawstring roll core 220.

Of course, the ratchet wheel 222 in the above embodiments may be a separate component, or may be an integral component formed by forming a plurality of tooth backs and tooth grooves on the circumferential wall of the pull tape winding core 220.

In other preferred embodiments, a notch 215 is provided above the pull strip locking assembly 213 to allow more pull strip to be wound onto the pull strip winding core 220, thereby allowing a wider range of adjustment of the length of the pull strip of the safety seat.

Although the above embodiments describe the case where the pull tape locking member 213 is pivotally disposed and the design is such that the pivot is pivotally disposed at the lower end of the pull tape locking member 213, it is obvious that it is possible to move the pivot by a suitable distance even if the pivot is located near the middle of the pull tape locking member 213.

Furthermore, the pull tab locking assembly 213 may be movably disposed, such as translationally disposed, in addition to being pivotally disposed.

In some embodiments, the basic shape of the pull strap locking assembly 213 of the above-described embodiments is unchanged, but is transitioned from a pivotally arrangement to a translationally arrangement that is accessible or distantly translatable relative to the ratchet wheel 222. For example, as shown in FIG. 9, the pivot of the pull tape locking assembly 213 is arranged flat to form a slider, the pivot slot on the pull tape holder is correspondingly formed as a slide slot, and a slide return spring is also arranged between the pull tape locking assembly 213 and the pull tape holder to maintain the pull tape locking assembly 213 in a contact tendency with the ratchet wheel 222, thereby achieving a linearly reciprocal displaceable arrangement relative to the pull tape holder 201 to approach or separate from the ratchet wheel 222. The draw tape locking assembly 213 has a slider 2133 formed thereon and the pivot hole 205 in the draw tape holder 201 has correspondingly been a guide slot to allow the slider 2133 to fit therein for reciprocal translational engagement of the draw tape locking assembly 213 with the ratchet wheel 222.

Of course, the above-mentioned slide block may be disposed in other manners, such as disposing a slide groove and a slide block on the side of the drawstring fixing seat, or other mature structures capable of making the drawstring locking assembly 213 perform reciprocating translation, without limitation.

In the above embodiments, both the pivotally disposed pull tape locking assembly 213 and the translationally disposed pull tape locking assembly 213 are engaged with the ratchet wheel 222 to achieve unidirectional locking of the rotation direction of the pull tape winding core 220, so that the pull tape 211 can be shortened without operating the pull tape locking assembly 213, and the extension thereof can be separated from the ratchet wheel 222 by operating the pull tape locking assembly 213 to correspondingly pivot or translate in the opposite direction, which can simplify the operation and enhance the user experience in practical applications.

Although the ratchet wheel 222 is disposed along the circumferential direction in the above embodiments, if the ratchet teeth are disposed on the outer end surface from the circumference and the position of the pull tape locking assembly 213 is changed accordingly, the pull tape winding core 220 can be locked by unidirectional rotation.

In addition, if the ratchet wheel 222 is removed, a structure using the bidirectional locking function is also possible.

For example, the ratchet wheel 222 is replaced by a conventional gear, and the rotation of the gear is locked by engaging a locking member that can be moved toward or away from the gear with the gear, thereby locking the rotation of the pull tape winding core 220, so that the length of the pull tape 211 can be neither extended nor shortened, for the purpose of bidirectional locking.

For another example, the first locking member 223 may be a locking hole arranged in the circumferential direction, and the locking hole may be arranged to penetrate or not to penetrate; the pull belt locking assembly 213 is a lock pin which is arranged in a telescopic manner, the second locking assembly 224 is formed by the front end of the lock pin, and the front end of the lock pin extends out of the lock hole to be matched with the lock hole so as to lock the pull belt winding core 220, so that the length of the pull belt 211 can not be extended or shortened, and the purpose of bidirectional locking is realized.

For another example, the first locking element 223 is a brake disc, the second locking element 224 is a brake caliper, the brake disc is rotatably disposed along with the pull tape winding core 220, the brake caliper makes the brake pad contact and rub with the brake disc under the action of the driving mechanism to lock the brake disc, so that the pull tape winding core 220 is locked, the length of the pull tape 211 can not be lengthened or shortened, and the purpose of bidirectional locking is achieved.

For another example, the first locking member 223 is a brake drum, the second locking member 224 is a brake shoe, the brake drum is rotatably disposed along with the pull belt winding core 220, and the brake shoe expands under the action of the driving mechanism and contacts and rubs with the brake drum to lock the brake drum, so that the pull belt winding core 220 is locked to make the length of the pull belt 211 neither extend nor shorten, thereby achieving the purpose of bidirectional locking.

Since the disc brake structure and the drum brake structure are known, the above description is only for the main functional components thereof, and the auxiliary components such as the driving mechanism and the like can be correspondingly arranged with reference to the prior art, and are not repeated herein.

While the above is a description of the drawtape locking mechanism of the safety seat, in the above-described related embodiment, in order to control the drawtape locking assembly 213 so as to change the rotation or locked state of the drawtape winding core 220, the drawtape locking assembly 213 may be controlled by the control mechanism.

The control mechanism can be electrically, pneumatically or manually controlled. For example, a motor, an air cylinder, a hydraulic cylinder, or the like may be used to drive the drawstring locking assembly 213 to act accordingly to lock or unlock.

In the preferred embodiment, the control mechanism is a manual control mechanism that includes a pull strip locking assembly 230.

The pull tape locking assembly 230 includes a pull wire 231, a first end of the pull wire 231 is connected to the pull tape locking assembly 213, for example, the first end of the pull wire 231 is connected to a control connecting hole 2132 of the pull tape locking assembly 213, so that the pull tape locking assembly 213 can be driven by the pull wire 231 to pivot or translate along a sliding groove, so that a pawl 2241 of the pull tape locking assembly 213 can contact or separate from a ratchet wheel 222 to control the locking or unlocking of the pull tape winding core 220, and a second end of the pull wire 231 is formed as an operating end disposed on the seat or the base for the user to operate.

For example, in embodiments having a pivotally disposed draw tape locking assembly 213, the draw tape roll core 220 can be rotated to allow the working length of the draw tape 211 to freely shorten but not lengthen by the tendency of the draw tape locking assembly 213 to initially remain in contact with the ratchet wheel 222 by the action of the pivot spring 214. When it is desired to extend the working length of the pulling belt, the operating end of the second end of the pulling wire 231 is operated to pivot the pulling belt locking assembly 213 away from the ratchet wheel 222, the pawl 2241 of the pulling belt locking assembly 213 is not in contact with the ratchet wheel 222 so that the ratchet wheel 222 can rotate in the reverse direction, and the pulling belt 211 is pulled to extend the working length; after the length of the draw tape 211 is adjusted to the proper position, the force applied to the operating end of the draw wire 231 is released and the draw tape locking assembly 213 pivots to bring the pawl 2241 into contact with the ratchet wheel 222 to lock the draw tape roll core 220.

Although it is necessary to continuously apply force to the operation end of the pulling string 231 when the working length of the pulling string 211 is extended in the above embodiment, this is not necessary, and the unlocked state may be maintained by providing an additional other structure.

Still alternatively, the operating end of the wire 231 may be connected to a rotation control mechanism or a back tilt control mechanism of the safety seat, thereby unlocking the extension lock of the pulling strap while controlling the rotation adjustment or the tilt adjustment of the safety seat.

For example, in some embodiments, the strap locking assembly 230 further comprises a pull rod 232, the pull rod 232 is movably or pivotably disposed, a first end of the pull rod 232 is connected to an operating end of a second end of the pull wire 231, a second end of the pull rod 232 is connected to the seat operating key 111, and the seat operating key 111 is a rotation adjusting member or a pitch adjusting key. Of course, it is also feasible to form the second end of the pull rod 232 as a separate button disposed on the base 11.

In other embodiments, the pull strip locking assembly 230 further comprises an unlocking operation assembly 300, and the first end of the pull rod 232 and the second end of the pull wire 231 are connected through the unlocking operation assembly 300.

The unlocking operation assembly 300 preferably has a torque amplification function so as to save the force applied by an operator; for example, it is based on the lever principle or the pulley principle to achieve amplification of the force to save operating force.

The unlocking manipulating member 300 includes a brake member 310, the brake member 310 includes a brake member 311, one end of the brake member 311 is formed as a wire connecting end for the first end of the wire 211 to be connected thereto, and the other end is formed as a control connecting end for the unlocking manipulating member 300 to be connected thereto; and, a middle portion of the brake piece 311 is hingedly disposed. In order to hingedly arrange the middle portion of the brake member 311, the unlocking operation assembly 300 further includes a brake fixing member 312, and a hinge groove is formed in the fixing member 312 for the brake member 311 to be hingedly arranged therein; the brake mounts 312 are attached to the seat. Of course, the brake assembly 310 may be hinged at one end and have a cable connection end and a control connection end near the middle and the other end, respectively.

In order to make the wire pulling operation smooth, a wire pulling casing 233 is further sleeved outside the wire pulling 231, a first end of the wire pulling casing 233 is fixed to the brake fixing member 312, and a second end of the wire pulling casing 233 is fixed to a seat near the outer side of the pulling belt fixing seat 201; the pulling wire 231 is disposed in the pulling wire housing 233 in a sleeving manner, and can be movably disposed in the pulling wire housing 233 to pull the pulling wire.

In other embodiments, the unlocking manipulating assembly 300 further includes a guide assembly 320, and the guide assembly 320 includes a first displacement member 321 and a second displacement member 322. The first end of the first displacement member 321 is connected with the connecting rod 232 to be driven by the connecting rod 232 to perform translational motion, the first displacement member 321 is provided with a guide groove 323, the guide groove 323 is obliquely arranged with an included angle with the displacement direction of the first displacement member 321, and the included angle between the guide groove 323 and the displacement direction of the first displacement member 321 can be 0-90 degrees, and is optimally 45 degrees.

The second displacement member 322 is disposed perpendicular to the displacement direction of the first displacement member 321 and movably disposed in a displaceable manner, a guide member 324 is disposed on the second displacement member 322, the guide member 324 is engaged in the guide groove 323, and the displacement of the first displacement member 321 is converted into the movable displacement of the second displacement member 322 by the engagement of the guide member 324 and the guide groove 323.

The upper end of the second displacement member 322 is formed into a brake control end 325 matched with the control connection end of the brake member 311, and the brake control end 325 is connected with or abutted against the control connection end; after the first displacement member 321 moves in a leftward translational manner, since the second displacement member 322 is fixed in the displacement direction and cannot move, the second displacement member 322 moves vertically through the cooperation of the guide member 324 and the guide groove 323, the brake control end 325 drives the control connection end to rotate the brake member 311 around the hinge point, the cable connection end of the brake member 311 pulls the cable 231 to drive the pull belt locking assembly 213 to move, so that the pull belt 220 is unlocked, and the working length of the pull belt 211 can be extended.

To limit the moving direction of the second displacement member 322, the unlocking manipulating assembly 300 further includes a vertical guide 330, and the vertical guide 330 is fixedly disposed in the safety seat, for example, in the seat portion 13 by unlocking the fixing member 301. The unlocking fixture 301 is further provided with an opening 302 for the second displacement member 322 to fit therein.

The vertical guide 330 is provided with a guide block 331 and a movable groove 332, the guide block 331 is disposed in the displacement direction of the first displacement member 321 to limit the second displacement member 322 from being displaced along the displacement direction of the first displacement member 321, and the movable groove 332 is disposed between the two guide blocks 331 to allow the second displacement member 322 to be movably disposed along the disposition direction of the movable groove 332. The second displacement member 322 is provided with a lifting guide slot 326 for the guide block 331 to fit in, so that the first displacement member 321 and the second displacement member 322 fit tightly.

The first displacement member 321 is further provided with a lifting groove 327 for matching the lower end of the second displacement member 322, and the guide grooves 323 are symmetrically arranged on the side wall of the lifting groove 327; the displacement slot 328 is shaped like a bar, so that the first displacement member 321 can move in a translational manner relative to the unlocking fixture 301 under the driving of the pull rod 232 to drive the second displacement member 322 to move up and down.

In addition, the guide block 331 and the movable slot 332 may also be formed by a hollow closed component, wherein a hollow chamber is formed as the movable slot 332, and a chamber wall is formed as the guide block 331.

The cross-sectional shapes of the movable slot 332 and the second displacement member 322 are not limited. But relatively speaking, the cross section of the I-shaped structure has better structural strength under the same condition. In particular, since the displacement direction of the first displacement member 321 is different from that of the second displacement member 322, the structural design can ensure the firmness of the device.

There are various ways of connecting the brake control end 325 at the upper end of the second displacement member 322 to the control connection end of the brake member 311, so long as it is ensured that the vertical displacement of the second displacement member 322 can drive the brake member 311 to rotate around the middle hinge point to control the locking or unlocking of the pull tape winding core 220.

For example, a brake attachment hole 3111 is provided at the control attachment end of the brake member 311, and the tip end of the brake control end 325 is fitted into the brake attachment hole 3111 to be positioned, and is fitted by means of contact between the two.

In other embodiments, the drawstring securement assembly 212 is disposed on the seat portion 13 or under the backrest 14, or in any case adjacent to the bottom of the seat, to facilitate the operation of the seat actuation key 111 in connection therewith and to provide better stability of the connection. The safety seat further comprises a drawstring guide, the drawstring guide comprises a first guide 241 arranged at the lower part of the backrest 14 and positioned at the inner side of the drawstring, a drawstring leading-out piece 244 positioned at the upper part of the backrest 14 and provided with a drawstring opening 245 to lead out the drawstring 211, and a second guide 242 and a third guide 243 which are arranged near the drawstring leading-out piece 244 and respectively positioned at the outer side and the inner side of the drawstring 211, the drawstring 211 is pulled and guided by the guide pieces, so that the drawstring 211 is finally led out from the upper part of the backrest 12 and is connected with an external anchor point, and the fixing effect of the drawstring 211 on the safety seat is good.

Claims (10)

1. A safety seat comprises a seat base (11) and a seat (12), the seat (12) comprising a seat portion (13) and a backrest (14); it is characterized in that the preparation method is characterized in that,

the safety seat further comprises a drawstring assembly (200), wherein the drawstring assembly (200) comprises a drawstring (211), a drawstring fixing assembly (212) and a drawstring locking assembly (213); the drawstring fixing component (212) is arranged on the seat (12), the first end of the drawstring (211) is connected with the drawstring fixing component (212), and the second end of the drawstring (211) extends out of the seat (12) to be connected with the anchor point;

the drawstring fixing component (212) comprises a drawstring fixing seat (201) and a drawstring roll core (220) which is rotationally arranged on the drawstring fixing seat (201), and the drawstring roll core (220) rotates to enable the drawstring (210) to be wound on the drawstring fixing seat to extend or shorten the working length of the drawstring (211); the drawtape locking assembly (213) is movably arranged to lock or unlock at least a rotation state of the drawtape winding core (220) to extend the working length of the drawtape (211);

the drawstring fixing component (212) comprises a first locking component (223), and the drawstring locking component (213) comprises a second locking component (224) matched with the first locking component (223); the first locking part (223) is rotationally arranged along with the drawstring winding core (220), and the second locking component (224) is movably arranged along with the drawstring locking component (213); the second locking member (224) is engaged with the first locking member (223) to lock the rotation of the draw tape fixing member (212) to extend the working length of the draw tape (211), or is disengaged from the first locking member (223) to unlock the rotation of the draw tape fixing member (212) to allow the working length of the draw tape (211) to extend.

2. A safety seat according to claim 1, wherein the first locking member (223) comprises circumferentially arranged teeth or splines and the second locking member (224) comprises correspondingly arranged splines or teeth; the second locking component (224) is movably arranged close to or far away from the first locking component (223), and the elongation of the working length of the drawtape (211) is locked by locking the rotation of the drawtape winding core (220) through the engagement of the teeth and the tooth grooves;

preferably, the second locking assembly (224) is arranged in a reciprocating displacement manner along a linear direction, so that the teeth or the tooth grooves of the first locking member (223) are matched with or separated from the teeth grooves or the teeth of the second locking assembly (224); or, the second locking component (224) is rotatably arranged around a pivot shaft, so that the teeth or the tooth grooves of the first locking component (223) are matched with or separated from the tooth grooves or the teeth of the second locking component (224);

preferably, the drawstring locking assembly (213) further comprises a locking spring member, wherein the locking spring member is an elastic element arranged between the drawstring locking assembly (213) and the drawstring fixing seat (201) so as to keep the first locking member (223) in contact with the second locking assembly (224);

preferably, the elastic element is a torsion spring, a compression spring or an extension spring.

3. The safety seat according to claim 1, wherein the pull strap winding core (220) includes a winding portion (221) and a ratchet wheel (222), the winding portion (221) being rotatably disposed on the pull strap holder (201), the ratchet wheel (222) being rotatably disposed with the winding portion (221); the ratchet wheel (222) comprises a ratchet tooth back (2201) and a ratchet tooth groove (2202), the ratchet tooth groove (220) is formed into the tooth groove, and a pawl (2241) formed into the tooth is arranged on the pull belt locking assembly (213);

an elastic element is arranged between the locking component (213) and the drawstring fixing seat (201) so as to ensure that the pawl (2241) keeps the contact trend with the ratchet wheel (222); the elastic element is a torsion spring, a compression spring or an extension spring;

said second locking assembly (224) being rotatably arranged about a pivot axis to engage or disengage the pawl (2241) with or from the ratchet slot (2202); or, the pulling belt locking assembly (213) is arranged in a reciprocating displacement way along a linear direction so as to enable the pawl (2241) to be matched with or separated from the ratchet groove (2202).

4. The safety seat according to claim 3, characterized in that a winding core spring is arranged between the drawtape winding core (220) and the drawtape fixing seat (201) so that the winding part (221) keeps a winding rotation trend;

preferably, the number of the ratchet wheels (222) is two, and the ratchet wheels are respectively positioned at two ends of the drawstring roll core (220) and fixedly connected with the drawstring roll core (220) so as to rotate along with the drawstring roll core; a gap (215) is arranged above the drawstring locking component (213).

5. The safety seat according to claim 1, wherein the first locking member (223) is a locking hole disposed along a circumferential direction, the locking hole being disposed through or without penetration; the drawstring locking component (213) is a lock pin which is arranged in a telescopic way, and a second locking component (224) is formed by the front end of the lock pin and extends out to be matched into the lock hole to lock the drawstring roll core (220); or the like, or, alternatively,

the first locking part (223) is a brake disc, the second locking component (224) is a brake caliper, the brake disc is rotationally arranged along with the pull belt winding core (220), and the brake caliper enables the brake pad to be in contact friction with the brake disc under the action of the driving mechanism so as to lock the brake disc; or the like, or, alternatively,

the first locking part (223) is a brake drum, the second locking component (224) is a brake shoe, the brake drum is rotationally arranged along with the pull belt winding core (220), and the brake shoe expands under the action of the driving mechanism and is in contact friction with the brake drum to lock the brake drum.

6. A safety seat according to any of claims 1-5, further comprising a drawstring control comprising a drawstring locking assembly (230); the drawstring locking assembly (230) comprises a pull wire (231), wherein the first end of the pull wire (231) is connected with the drawstring locking assembly (213) to drive the drawstring locking assembly to move, and the second end is formed as an operation end or is connected with a seat operation key (111).

7. A safety seat according to claim 6, wherein the pull strap locking assembly (230) further comprises a pull rod (232), the pull rod (232) being displaceably or pivotably arranged, a first end of the pull rod (232) being connected to the operative end of the pull wire (231) and a second end being connected to the seat operating key (111);

preferably, the draw tape locking assembly (230) further comprises an unlocking operation assembly (300), and a displaceable or pivotably arranged draw bar (232); the first end of the pull rod (232) is connected with the operating end of the second end of the pull wire (231) through the unlocking operating component (300), and the second end of the pull rod (232) is connected with the seat operating key (111);

the unlocking operation assembly (300) comprises a brake assembly (310), the brake assembly (310) comprises a brake piece (311) which is hinged, and a brake fixing piece (312) which is used for fixing the brake piece in a hinged mode, and the brake piece (311) is hinged to the brake fixing piece (312) along one end or the middle of the brake piece; the brake piece (311) is provided with a stay wire connecting end for connecting the operating end of the stay wire (231) and a control connecting end for connecting the first end of the pull rod (232), the first end of the pull rod (232) is connected with the control connecting end, and the second end of the stay wire (231) is connected with the stay wire connecting end;

preferably, a stay wire shell (233) is sleeved outside the stay wire (231), and the stay wire (231) is sleeved in the stay wire shell (233); the first end of the cable housing (233) is secured to the brake anchor (312).

8. The safety seat according to claim 6, wherein the unlocking operation assembly (300) further comprises a guide assembly (320), the guide assembly (320) comprising a first displacement member (321) and a second displacement member (322);

the first end of the first displacement piece (321) is connected with the connecting rod (232) to be driven by the connecting rod to do translational motion, and a guide groove (323) which is obliquely arranged is arranged on the first displacement piece (321);

the second displacement piece (322) is perpendicular to the displacement direction of the first displacement piece (321) and movably arranged in a displaceable manner, a guide piece (324) is arranged on the second displacement piece (322), and the guide piece (324) is matched with the guide groove (323) so as to convert the displacement of the first displacement piece (321) into the movable displacement of the second displacement piece (322) through the matching of the guide piece (324) and the guide groove (323);

preferably, the upper end of the second displacement member (322) is formed as a brake control end (325) for engaging with the control connection end of the brake member (311), and the brake control end (325) is connected to or abutted against the control connection end.

9. The safety seat according to claim 6, wherein the unlocking manipulating assembly (300) further comprises a vertical guide (330), the vertical guide (330) comprising a movable groove (332), and the second displacing member (322) is fitted in the movable groove (332) to be displaceably moved in a setting direction of the movable groove (332).

10. The safety seat according to any of claims 1-5, wherein the pull strap securement assembly (212) is disposed adjacent the seat bottom, the safety seat further comprising a pull strap guide; the tape guide includes: a first guide (241) provided at a lower portion of the backrest (14) and located inside the draw tape (211), a draw tape lead-out member (244) provided at an upper portion of the backrest (14) and provided with a draw tape slit (245) to lead out the draw tape (211), and a second guide (242) provided near the draw tape lead-out member (244) and located outside the draw tape (211);

preferably, the tape guide further includes: and the third guide piece is arranged near the drawstring leading-out piece and positioned on the inner side of the drawstring.

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