Patent Description:
The present invention relates to the field of children products, in particular to a child safety seat.

Currently, children of different ages and weights have different requirements for the use of child safety seats. When the user is a small child (e.g. weighing less than <NUM>), the child must be restrained with a five-point safety belt; and when the user is a larger child (e.g. weighing <NUM> - <NUM>), it is required to use vehicle belts to restrain children, and five-point safety belts are not allowed. However, in actual use, misuse often occurs, and there will also be a problem that the height of the head support does not correspond.

<CIT> discloses a child restraint with belt management system. The child restraint includes a juvenile seat and a child-restraint harness coupled to the juvenile seat. The child-restraint harness includes a crotch belt having a buckle and two shoulder belts that can be linked to the buckle to restrain a child sitting on the juvenile seat.

<CIT> discloses a child seat device. The invention is based on a child seat device with a seat base unit which provides a seating and/or lying surface for a child, with a head part which can be adjusted in at least one direction in relation to the seat base unit and which is used to form at least one support area provided for the child's head, with at least one locking device which is provided for locking the head part in at least two different positions relative to the seat base unit, with an integrated belt system, which is provided at least to secure the child up to a maximum toddler height, and with a stowage device by means of which the integrated belt system can be stowed away from a height that is greater than the maximum toddler height. It is proposed that the locking device and the stowage device are at least partially functionally linked to one another.

For the above problems, the present invention is intended to provide a child safety seat, in which the five-point safety belt or a vehicle belt can be correspondingly selected for use based on the size of a child, and the height of a head support can be adjusted in a corresponding range.

To achieve the above purpose, the present invention employs the following technical solution:.

In one embodiment, the child safety seat has a first usage state and a second usage state,.

Preferably, the seat body further comprises a position-limit mechanism for preventing the head support assembly from being higher than the predetermined position and an unlocking member for releasing the position limit of the head support assembly and the position-limit mechanism, and the unlocking member is slidably disposed on the housing and one end of the unlocking member is movably disposed in the storage slot; when the child safety seat is converted from the first usage state to the second usage state, the seat belt buckle enters the storage slot and presses the one end of the unlocking member to release the position limit of the head support assembly and the position-limit mechanism.

More preferably, the unlocking member is disposed on the housing in a sliding up and down manner, and a lower end portion of the unlocking member is movably disposed in the storage slot.

In one preferred embodiment, the head support assembly comprises a head support fixed part, and the the head support fixed part is formed with a position-limit face facing upward thereon;.

Preferably, the head support fixed part is opened with a first guide slot thereon, the first guide slot extends along a up-and-down direction, the position-limit face is formed on a lower wall of the first guide slot, and a left or right wall of the first guide slot is opened with a gap for the first lock pin to go in and out; when the child safety seat is in the first usage state, the first lock pin is slidably inserted in the first guide slot; when the child safety seat is in the second usage state, the first lock pin is located outside the first guide slot.

More preferably, the head support fixed part is further opened with a second guide slot thereon, the second guide slot is in communication with the first guide slot via the gap; when the child safety seat is in the second usage state, the first lock pin is slidably inserted in the second guide slot or located directly under the second guide slot.

Preferably, the position-limit mechanism further comprises a first elastic element disposed between the housing and the first lock pin seat.

In another preferred embodiment, the housing comprises an outer plate cover and an inner plate cover capable of sliding relative to the outer plate cover, the position-limit mechanism comprises a first position-limit portion formed on the inner plate cover and a second position-limit portion formed on the outer plate cover, the first position-limit portion is located directly under the second position-limit portion, and when the head support assembly is in the predetermined position, the first position-limit portion pushes against the second position-limit portion;.

Preferably, an upper end portion of the unlocking member is provided with an unlocking tilted slot, the second lock pin seat is slidably inserted in the unlocking tilted slot, and the unlocking slope is formed on a wall of the unlocking tilted slot.

More preferably, the number of the second lock pin is two and they are disposed at intervals on the left and right, the inner plate cover and the outer plate cover are disposed between the two second lock pins, and a distance between upper ends of the unlocking tilted slots on the left and right sides is smaller than that between the lower ends thereof.

Preferably, the head support is provided with a first mounting slot, the inner plate cover lock pin is slidably disposed in the first mounting slot, and a wall of the first mounting slot and the inner plate cover is provided with a second elastic element therebetween for inserting the inner plate cover lock pin into the inner lock slot.

Preferably, the first position-limit portion and the second position-limit portion are respectively protrusions.

Preferably, a second mounting slot is provided on the head support, the second mounting slot is provided therein with a position lock pin capable of sliding left and right, a lower portion of the outer plate cover is provided with a plurality of first positioning slots spaced up and down, an upper portion of the outer plate cover is provided with a plurality of second positioning slots spaced up and down, the inner plate cover is provided with a plurality of third positioning slots spaced up and down, and the second positioning slots and the third positioning slots correspond one to one; when the child safety seat is in the first usage state, the positioning lock pin is inserted into any of the first positioning slots; when the child safety seat is in the second usage state, the second positioning slots are aligned with the corresponding third positioning slots, and the positioning lock pin is inserted into any of the second positioning slots and the corresponding third positioning slot.

Preferably, the head support assembly further comprises an adjustment handle capable of sliding up and down, a lower portion of the adjustment handle is provided with an adjustment tilted slot, and the positioning lock pin is provided with a protrusion slidably inserted in the adjustment tilted slot.

Preferably, between the housing and the unlocking member is provided a third elastic element for driving the unlocking member to move upward.

In combination with the above, the present disclosure employing the above technical solution has the following advantages over the prior art:
The child safety seat has two corresponding usage states according to the weight or age of the child, when the user is lighter or younger, the child is restrained by the five-point safety belt restraint system, and the height of the head support assembly is not higher than the predetermined position; when the user is heavier or older, the vehicle seat belt is used, the five-point safety belt restraint system can not be used, and the height of the head support assembly can be adjusted to the height of the predetermined position or above; by putting the seat belt buckle in the storage slot of the housing, the head support assembly can be adjusted upward to above the predetermined position, which is suitable for older children and prevents older children from using the five-point safety belt; in the case that a younger child uses the five-point safety belt, that is, the seat belt buckle is outside the storage slot, and the head support assembly can only be adjusted and used at the predetermined position and below, preventing young children from using the head support assembly higher than the predetermined position, and it is realized that the head support assembly can be adjusted within the set height range of the corresponding usage state according to the weight or age of the child.

For more clearly explaining the technical solutions of the present invention the accompanying drawings used to describe the embodiments are simply introduced in the following. Apparently, the below described drawings merely show a part of the embodiments of the present invention and those skilled in the art can obtain other drawings according to the accompanying drawings without creative work.

In the following, the preferable embodiments of the present invention are explained in detail combining with the accompanying drawings so that the advantages and features of the present invention can be easily understood by the skilled persons in the art. The orientational words mentioned in the present disclosure are defined according to the observation angle of the child safety seat by those skilled in the art, for example, "left" and "right" corresponding to the left and right sides of the paper in <FIG> respectively.

This embodiment provides a child safety seat according to the present invention which comprises a seat body and a five-point safety belt disposed on the seat body, the five-point safety belt mainly consists of two shoulder safety belts, two waist safety belts, a crotch safety belt and a seat belt buckle <NUM> connecting the five safety belts to each other, to restrain and protect the child on the seat body. The child safety seat has two usage states, namely a first usage state shown in <FIG> and <FIG> and a second usage state shown in <FIG> and <FIG>.

Referring to <FIG>, the seat body comprises a housing <NUM>, and the housing <NUM> is internally provided with a storage slot <NUM> used for storing the safety belt buckle <NUM>. When the child safety seat is in the first usage state, the safety belt buckle <NUM> is located outside the storage slot <NUM> all the time, that is, the five-point safety belt is normally placed on the seat body to allow the use of the five-point safety belt to restrain the child sitting on the seat body. When the child safety seat is in the second usage state, the safety belt buckle <NUM> is located in the storage slot <NUM>, the five-point safety belt is not allowed to be used, and only the vehicle seat belt can be used. By placing the seat belt buckle <NUM> in the storage slot <NUM> of the housing <NUM> and buckling a storage slot cover <NUM>, the five-point safety belt can be effectively prevented from being misused in the second usage state. Wherein, the seat belt buckle <NUM> can be put into the storage slot <NUM> in a state of being connected to the seat belt.

The seat body further comprises a head support assembly <NUM> disposed on the housing <NUM> in a sliding up and down manner, the height of the head support assembly <NUM> is adjustable to have a plurality of positions corresponding to different heights, one of the positions is a predetermined position, the head support assembly <NUM> can be adjusted up and down in the position below the predetermined position to adapt to the use of a five-point safety belt for smaller children, and the head support assembly <NUM> is adjusted at a position above the predetermined position to adapt to the use of vehicle seat belts for older children. When the child safety seat is in the first usage state, and the head support assembly <NUM> is in any position between the lowest position and the predetermined position, the seat belt buckle <NUM> can be put into the storage slot <NUM>, and when the seat belt buckle <NUM> is placed in the storage slot <NUM>, the head support assembly <NUM> is adjusted upward to convert the child safety seat to the second usage state.

The seat body further comprises a position-limit mechanism for preventing the head support assembly <NUM> from being higher than the predetermined position and an unlocking member <NUM> for releasing the position limit of the head support assembly <NUM> and the position-limit mechanism, and the unlocking member <NUM> is slidably disposed on the housing <NUM> and one end of the unlocking member <NUM> is movably disposed in the storage slot <NUM>. When the child safety seat is in the first usage state, blocked by the position-limit mechanism, the head support assembly <NUM> is not higher than the predetermined position, that is, the head support assembly <NUM> can only be in the lowest position, the predetermined position or between the lowest position and the predetermined position. When the child safety seat is converted from the first usage state to the second usage state, the seat belt buckle <NUM> is placed in the storage slot <NUM> and presses the one end of the unlocking member <NUM> to release the position limit of the position-limit mechanism and the head support assembly <NUM>, and the head support assembly <NUM> is able to be adjusted upward. When the child safety seat is in the second usage state, the head support assembly <NUM> is higher than the predetermined position, and the height of the head support assembly <NUM> is adjusted between the predetermined position and the highest position. Only after the seat belt buckle <NUM> is put into the storage slot <NUM>, the head support assembly <NUM> can be released from the position limit and adjusted upward to adapt to the height of the child, avoiding the misuse of the five-point safety belt in the second usage state.

Specifically, as shown in <FIG> and <FIG>, in this embodiment, the unlocking member <NUM> is disposed on the housing <NUM> in a sliding up and down manner, and a lower end portion of the unlocking member <NUM> is movably disposed in the storage slot <NUM>. When the seat belt buckle <NUM> is put into the storage slot <NUM>, the end portion of the seat belt buckle <NUM> presses the lower end of the unlocking member <NUM> and drives the unlocking member <NUM> to move downward for a certain distance. Between the housing <NUM> and the unlocking member <NUM> is provided a third elastic element <NUM> for driving the unlocking member <NUM> to move upward, and the third elastic element <NUM> is specifically a compression spring disposed between the unlocking member <NUM> and the housing <NUM>, wherein the lower portion of the unlocking member <NUM> is connected with the upper end of the compression spring.

The head support assembly <NUM> comprises a head support fixed part <NUM>, and the head support fixed part <NUM> is formed with a position-limit face 311a facing upward thereon. The position-limit mechanism comprises a first lock pin seat <NUM> disposed on the housing <NUM> in a sliding left and right manner, the first lock pin seat <NUM> is provided with a first lock pin <NUM> cooperating with the position-limit face 311a, and when the head support assembly <NUM> is in the predetermined position, the first lock pin <NUM> pushes against the position-limit face 311a, and blocked by the first lock pin, the head support fixed part <NUM> cannot continue to slide upward. That is to say, when the child safety seat is in the first usage state, the first lock pin <NUM> is located directly above the position-limit face 311a or pushes against the position-limit face 311a; when the child safety seat is in the second usage state, the first lock pin <NUM> is located on the left or right side of the position-limit face 311a to disengage from the position-limit face 311a. Specifically as shown in <FIG>, <FIG>, <FIG>, <FIG>, the head support fixed part <NUM> is opened with a first guide slot <NUM> thereon, the first guide slot <NUM> extends along a up-and-down direction, the position-limit face 311a is formed on a lower wall of the first guide slot <NUM>, and in addition, a right wall of the first guide slot <NUM> is opened with a gap <NUM> for the first lock pin <NUM> to go in and out, and a lower end of the gap <NUM> is preferably level with the position-limit face 311a. When the child safety seat is in the first usage state, the first lock pin <NUM> is slidably inserted in the first guide slot <NUM>; when the child safety seat is in the second usage state, the first lock pin <NUM> slides out from the gap <NUM> and is located outside the first guide slot <NUM>.

Further, the head support fixed part <NUM> is further opened thereon with a second guide slot <NUM> extending the up-and-down direction, the second guide slot <NUM> is in communication with the first guide slot <NUM> via the gap <NUM>, and an upper end of the gap <NUM> is preferably level with an upper wall of the second guide slot <NUM>. When the child safety seat is in the second usage state, the first lock pin <NUM> is slidably inserted in the second guide slot <NUM> or located directly under the second guide slot <NUM>. As shown in <FIG>, when the child safety seat is in the first usage state, the height adjustment range of the head support assembly <NUM> is shown as d1 in <FIG>, and d1 is equal to the length of the first guide slot <NUM>; as shown in <FIG>, when the child safety seat is in the second usage state, the height adjustment range of the head support assembly <NUM> is shown as d2 in <FIG>, d2 is greater than the length of the second guide slot <NUM>, and the lower end of the second guide slot <NUM> is open, and as the head support assembly <NUM> is gradually adjusted upward, the first lock pin <NUM> is disengaged from the second guide slot <NUM> and is located directly under the second guide slot <NUM>. It should also be noted that: the position-limit face 311a is formed on the lower wall of the first guide slot <NUM>, and is used to prevent the height of the head support assembly <NUM> from being adjusted upwards above the predetermined position in the first usage state; the upper wall of the two guide slots <NUM> also has a position limiting function, which is used to prevent the height of the head support assembly <NUM> from being lower than the predetermined position in the second usage state.

The housing <NUM> comprises an unlocking member cover <NUM>, and the unlocking member cover <NUM> is buckled on the rear side and the lower side of the unlocking member <NUM>. An upper portion of the unlocking member cover <NUM> is provided with a long slot 13a extending in the left-right direction, and the first lock pin <NUM> is inserted into the long slot 13a to be slidable left and right. The unlocking member <NUM> is in a tight contact with the first lock pin seat <NUM> and at least one of the components is provided with an unlocking slope that contacts and cooperates with the other component, and the unlocking slope is gradually tilted upward or downward from left to right. Specifically, in this embodiment, the upper end portion of the unlocking member <NUM> has an unlocking slope 5a that gradually tilts downward from right to left, and the first lock pin seat <NUM> also has an unlocking slope 4a that gradually tilts downward from right to left, and the two unlocking slopes 5a and 4a contact and cooperate with each other. A first elastic element <NUM> is provided between the first lock pin seat <NUM> and the housing <NUM> to push the first lock pin seat <NUM> to move so that the first lock pin <NUM> enters the second guide slot <NUM> from the first guide slot <NUM>. Specifically, the first elastic element <NUM> is a compression spring sleeved on the end portion of the first lock pin seat <NUM>, and both ends of the compression spring pushes against the first lock pin seat <NUM> and the housing <NUM>, respectively. When the child safety seat is converted from the first usage state to the second usage state, as the seat belt buckle <NUM> is placed in the storage slot <NUM> and presses the lower end of the unlocking member <NUM> to move downward as the safety belt buckle <NUM>, and the unlocking member <NUM> is moved downward, so that the first elastic element <NUM> is gradually reset, pushing the first lock pin seat <NUM> to move to the right to enter the second guide slot <NUM> through the gap <NUM>, the first lock pin seat <NUM> is disengaged from the position-limit face 311a in the guide slot <NUM>, and the head support assembly <NUM> can be adjusted upward. When the child safety seat is converted from the second usage state to the first usage state, the seat belt buckle <NUM> is taken out from the storage slot <NUM>, the third elastic element <NUM> is reset, pushing the unlocking member <NUM> to move upward, and the first lock pin seat <NUM> moves to the left under the push of the unlocking slope 5a, the first lock pin <NUM> enters the first guide slot <NUM> through the gap <NUM>, and the head support assembly <NUM> is not higher than the predetermined position.

The child safety seat in this embodiment is suitable for children of different weights and different ages. A safety seat suitable for children with <NUM> - <NUM> is taken as an example to describe the use process of the child safety seat of the present disclosure. For infants of <NUM> - <NUM>, the child safety seat needs to be converted to the first usage state, refer to <FIG>, in this first usage state, the seat belt buckle <NUM> is normally on the seat body, the five-point safety belt must be used to restrain infants; the first lock pin <NUM> is inserted in the first guide slot <NUM>, and the head support assembly <NUM> can move upward to the predetermined position at most, that is, the height of the head support assembly <NUM> can only in the lowest position, the predetermined position, or between the two, to adapt to the height of the child. For older children of <NUM> - <NUM>, the child safety seat needs to be converted to the second usage state, as shown in <FIG>, in this second usage state, the child is restrained by the vehicle belt and the five-point safety belt cannot be used, the seat belt buckle <NUM> must be put into the storage slot <NUM>, and the storage slot cover <NUM> should be buckled to prevent misuse of the five-point safety belt; the lower end of the unlocking member <NUM> is pressed by the seat belt buckle <NUM> and moves down, the first locking pin <NUM> is located at or below the second guide slot <NUM>, and the height of the head support assembly <NUM> is adjusted to above the predetermined position to adapt to the height of older children.

<FIG> show another child safety seat according to the present invention this embodiment and Embodiment <NUM> differs in that the unlocking member <NUM> and the position-limit mechanism are different.

Referring to <FIG>, the child safety seat comprises a seat body and a five-point safety belt arranged on the seat body. The child safety seat has two usage states, namely a first usage state shown in <FIG> and a second usage state shown in <FIG> and <FIG>. The seat body comprises a housing <NUM>, and the housing <NUM> is internally provided with a storage slot <NUM> used for storing the safety belt buckle <NUM> of the five-point safety belt. When the child safety seat is in the first usage state, the five-point safety belt is used. When the child safety seat is in the second usage state, the safety belt buckle <NUM> is located in the storage slot <NUM>, the five-point safety belt is not allowed to be used, and only the vehicle seat belt can be used to restrain the child. By placing the seat belt buckle <NUM> in the storage slot <NUM> of the housing <NUM> and buckling a storage slot cover <NUM>, the five-point safety belt can be effectively prevented from being misused in the second usage state.

The seat body further comprises a head support assembly <NUM> disposed on the housing <NUM> in a sliding up and down manner, the height of the head support assembly <NUM> is adjustable so as to have a plurality of positions corresponding to different heights, and one of the positions is the predetermined position. When the child safety seat is in the first usage state, the seat belt buckle <NUM> can be put into the storage slot <NUM> only when the head support assembly <NUM> is in the predetermined position, and when the seat belt buckle <NUM> is placed in the storage slot <NUM>, the head support assembly <NUM> is adjusted upward to convert the child safety seat to the second usage state.

The seat body further comprises a position-limit mechanism for preventing the head support assembly <NUM> from being higher than the predetermined position and an unlocking member <NUM> for releasing the position limit of the head support assembly <NUM> and the position-limit mechanism, and the unlocking member <NUM> is slidably disposed on the housing <NUM> and one end of the unlocking member <NUM> is movably disposed in the storage slot <NUM>. When the child safety seat is in the first usage state, blocked by the position-limit mechanism, the head support assembly <NUM> is not higher than the predetermined position, that is, the head support assembly <NUM> can only be in the lowest position, the predetermined position or between the lowest position and the predetermined position. When the child safety seat is converted from the first usage state to the second usage state, the seat belt buckle <NUM> enters the storage slot <NUM> and presses the one end of the unlocking member <NUM> to release the position limit of the position-limit mechanism and the head support assembly <NUM>. When the child safety seat is in the second usage state, the head support assembly <NUM> is higher than the predetermined position, and the height of the head support assembly <NUM> is adjusted between the predetermined position and the highest position. Only after the seat belt buckle <NUM> is put into the storage slot <NUM>, the head support assembly <NUM> can be released from the position limit and adjusted upward to adapt to the height of the child, avoiding the misuse of the five-point safety belt in the second usage state. In addition, when the child safety seat is in the first usage state, the seat belt buckle <NUM> is located outside the storage slot <NUM> only when the head support assembly <NUM> is lower than the predetermined position, and the five-point safety belt is used to restrain the child, and the seat belt buckle <NUM> can be put into the storage slot <NUM> when the head support assembly <NUM> is in the predetermined position, thereby allowing the seat belt buckle <NUM> to be put inside the storage slot <NUM> to switch to the second usage state.

Referring to <FIG>, in this embodiment, the unlocking member <NUM> is disposed on the housing <NUM> in a sliding up and down manner, and a lower end portion of the unlocking member <NUM> is movably disposed in the storage slot <NUM>. When the seat belt buckle <NUM> is put into the storage slot <NUM>, the end portion of the seat belt buckle <NUM> presses the lower end of the unlocking member <NUM> and drives the unlocking member <NUM> to move downward for a certain distance. Between the housing <NUM> and the unlocking member <NUM> is provided a third elastic element <NUM> for driving the unlocking member <NUM> to move upward, and the third elastic element <NUM> is specifically a compression spring disposed between the unlocking member <NUM> and the housing <NUM>, wherein the lower portion of the unlocking member <NUM> is connected with the upper end of the compression spring.

Combining with <FIG> and <FIG>, the housing <NUM> specifically comprises a fixed outer plate cover <NUM> and an inner plate cover <NUM> capable of sliding relative to the outer plate cover <NUM>, the position-limit mechanism comprises a first position-limit portion 15a formed on the inner plate cover <NUM> and a second position-limit portion 14a formed on the outer plate cover <NUM>, the first position-limit portion 15a is located directly under the second position-limit portion 14a, and when the head support assembly <NUM> is in the predetermined position, the first position-limit portion 15a pushes against the second position-limit portion 14a. Specifically, in this embodiment, as shown in <FIG>, the outer plate cover <NUM> is surrounded and disposed on the front side of the inner plate cover <NUM>, the first position-limit portion 15a and the second position-limit portion 14a respectively protrudes, and the first position-limit portion 15a is a protrusion portion of the inner plate cover <NUM> extending forward, and the second position-limit portion 14a is a transverse rib of the outer plate cover <NUM> extending backward.

The seat body further comprises a second lock pin <NUM>, the second lock pin <NUM> is disposed on a second lock pin seat <NUM>, the unlocking member <NUM> is in a tight contact with the second lock pin seat <NUM> and at least one of the components is provided with an unlocking slope that contacts and cooperates with the other component, and the unlocking slope gradually is tilted upward or downward from left to right. An upper end portion of the unlocking member <NUM> is provided with an unlocking tilted slot 7a, the second lock pin seat <NUM> is slidably inserted in the unlocking tilted slot 7a, and the unlocking slope is formed on a wall of the unlocking tilted slot 7a. The number of the second lock pin is two and they are disposed at intervals on the left and right, the inner plate cover <NUM> and the outer plate cover <NUM> are disposed between the two second lock pins <NUM>, the unlocking tilted slots 7a on the left and right sides are provided symmetrically and a distance between upper ends of the unlocking tilted slots 7a on the left and right sides is smaller than that between the lower ends thereof. That is, referring to <FIG>, the left unlocking tilted slots 7a gradually tilts upward from left to right, and the right unlocking tilted slots 7a gradually tilts upward from right to left.

The outer plate cover <NUM> is provided with an outer locking slot 41b into which the second lock pin <NUM> is inserted, and the inner plate cover <NUM> is provided with an inner locking slot 15b into which the second lock pin <NUM> is inserted. The head support assembly <NUM> specifically comprises a head support <NUM> and an inner plate cover lock pin <NUM> that can be inserted into the inner lock slot 15b, in this embodiment, the lower portion of the head support <NUM> is located between the inner plate cover <NUM> and the outer plate cover <NUM>. Combining with <FIG> and <FIG>, when the child safety seat is in the first usage state, the inner plate cover lock pin <NUM> is inserted into the inner lock slot 15b to connect the head support assembly <NUM> and the inner plate cover <NUM> as a whole, thereby synchronously sliding up and down with respect to the outer plate cover <NUM>, at this moment, when the head support assembly <NUM> slides to the predetermined position as shown in <FIG>, the second position-limit portion 14a on the outer plate cover <NUM> blocks the first limiting portion 15a on the inner plate cover <NUM>, and the head support assembly <NUM> cannot be further adjusted upward. As shown in <FIG> and <FIG>, when the child safety seat is in the second usage state, the inner lock slot 15b and the outer lock slot 14b are aligned with each other, and the second lock pin <NUM> is inserted into the inner lock slot 15b and the outer lock slot 14b, so that the inner plate cover <NUM> and the outer plate cover <NUM> are connected as a whole, and at this time, the second lock pin <NUM> pushes the inner plate cover lock pin <NUM> out of the inner lock slot 15b, so that the head support assembly <NUM> is disengaged from the inner plate cover <NUM>, so as to be able to slide up and down with respective to the inner plate cover <NUM> and the outer plate cover <NUM>. After the seat belt buckle <NUM> is placed in the storage slot <NUM>, the second lock pin <NUM> moves in the unlocking tilted slot 7a, and the inner plate cover lock pin <NUM> is pushed from the inner lock slot 15b.

The lower portion of the head support <NUM> is provided with a first mounting slot extending in the left-right direction, the inner plate cover lock pin <NUM> is slidably disposed in the first mounting slot, between the wall of the first mounting slot and the inner plate cover lock pin <NUM> is disposed a second elastic element <NUM> for inserting the inner plate cover lock pin <NUM> into the inner lock slot 15b. The second elastic element <NUM> is specifically a compression spring disposed on the wall of the mounting slot and the inner plate cover lock pin <NUM>. When the child safety seat is in the first usage state, the second elastic element <NUM> is in an initial state; when it is converted to the second usage state, the second elastic element <NUM> is compressed by the inner plate cover lock pin <NUM> pushed out of the inner lock slot 15b; when the second lock pin <NUM> is disengaged from the inner lock slot 15b, the second elastic element <NUM> is reset and pushes the inner plate cover lock pin <NUM> into the inner lock slot 15b to connect the head support <NUM> and the inner plate cover <NUM>.

The lower part of the head support <NUM> is also provided with a second mounting slot extending in the left and right direction, two positioning lock pins <NUM> are provided in the second mounting slot, the positioning lock pin <NUM> is able to slide left and right in the second mounting slot, and the positioning lock pin <NUM> is located below the inner plate cover lock pin <NUM>. The portion of the outer plate cover <NUM> below the outer lock slot 14b is provided with a plurality of first positioning slots 14c at equal intervals up and down, and the part of the outer plate cover <NUM> above the outer lock slot 14b is provided with a plurality of second positioning slots 14d at equal intervals up and down, the portion of the inner plate cover <NUM> above the inner lock slot 15b is provided with a plurality of third positioning slots 15c at equal intervals up and down, and the second positioning slots 14d and the third positioning slots 15c have the same number and correspond one to one. When the child safety seat is in the first usage state, the positioning lock pin <NUM> is inserted into any of the first positioning slots 14c to lock the head support <NUM> at a specified height; in this embodiment, the number of the first positioning slots 14c is six, the head support assembly <NUM> can be adjusted in six positions comprising the predetermined position when in the first usage state. When the child safety seat is in the second usage state, each second positioning slot 14d is aligned with the corresponding third positioning slot 15c, the positioning lock pin <NUM> is inserted into any second positioning slot 14d and the corresponding thrid positioning slot 15c, and the head support <NUM> is locked at a specified height; in this embodiment, the number of the second positioning slots 14d and the third positioning slots 15c are five, respectively, and the head support assembly <NUM> can be adjusted in five positions in the first usage state.

The head support assembly <NUM> also comprises an adjustment handle <NUM> that can slide up and down, the lower part of the adjustment handle <NUM> is provided with a pair of adjustment tilted slots <NUM>, the pair of adjustment tilted slots <NUM> are disposed symmetrically to the left and right, and the distance between the upper ends of the two is smaller than that between the lower ends. The positioning lock pin <NUM> has a protrusion 323a slidably inserted in the adjustment tilted slot <NUM>. Pull up the adjustment handle <NUM>, the protrusion 323a enters the lower end portion of the adjustment tilted slot <NUM>, and under the action of the wall of the adjustment tilted slot <NUM>, the positioning lock pin <NUM> retracts into the second mounting slot, thereby disengaging from the first positioning slot 14c or the second positioning slot 14d and the third positioning slot 15c, realizing the unlocking of the head support <NUM>, and the head support <NUM> can be adjusted up and down. A fourth elastic element <NUM> for inserting the positioning lock pin <NUM> into the first positioning slot 14c or into the second positioning slot 14d and the third positioning slot 15c is provided between the positioning lock pin <NUM> and the wall of the second mounting slot, and the fourth elastic element <NUM> is specifically a compression spring disposed on the wall of the second mounting slot and the positioning lock pin <NUM>.

A safety seat suitable for children with <NUM> - <NUM> is taken as an example to describe the use process of the child safety seat of the present disclosure. For infants of <NUM> - <NUM>, the child safety seat needs to be converted to the first usage state, the seat belt buckle <NUM> is normally on the seat body, and the five-point safety belt is used to restrain infants, as shown in <FIG>. In <FIG> and <FIG>, the head support assembly <NUM> is in the lowest position, and the positioning lock pin <NUM> is inserted in the lowest first positioning slot 14c; in <FIG>, the head support assembly <NUM> is in the predetermined position, and the positioning lock pin <NUM> is inserted into the uppermost first positioning slot 14c. As shown in <FIG> and <FIG>, in the first usage state, the second lock pin <NUM> is only inserted in the outer lock slot 14b, the inner plate cover lock pin <NUM> is inserted in the inner lock slot 15b, and the inner plate cover <NUM> moves along with the head support assembly <NUM>, and the head support assembly <NUM> can move up to the predetermined position at most, that is, the height of the head support assembly <NUM> can only be at the lowest position shown in <FIG> and <FIG>, the predetermined position shown in <FIG>, or between the two. For older children of <NUM> - <NUM>, the child safety seat needs to be converted to the second usage state, as shown in <FIG>, in the second usage state, the child is restrained by the vehicle belt and the five-point safety belt cannot be used, the seat belt buckle <NUM> must be put into the storage slot <NUM>, and the storage slot cover <NUM> should be buckled to prevent misuse of the five-point safety belt; the lower end portion of the unlocking member <NUM> is pressed by the seat belt buckle <NUM> and moves downward, the second lock pin <NUM> is inserted into the inner lock slot 15b and the outer lock slot 14b to connect the inner plate cover <NUM> and the outer plate cover <NUM> (as shown in <FIG> and <FIG>), the inner plate cover lock pin <NUM> is disengaged from the inner lock slot 15b so that the head support assembly <NUM> moves relative to the inner plate cover <NUM> and the outer plate cover <NUM>, and the height of the head support assembly <NUM> is adjusted to above the predetermined position.

Claim 1:
A child safety seat, comprising a seat body and a five-point safety belt disposed on the seat body, the seat body comprising a housing (<NUM>), the five-point safety belt comprising a safety belt buckle, the housing (<NUM>) being internally provided with a storage slot (<NUM>) used for storing the safety belt buckle; is characterized in that,
the seat body further comprises a head support assembly (<NUM>) disposed on the housing (<NUM>) in a sliding up and down manner, the head support assembly (<NUM>) has a predetermined position, and when the safety belt buckle is placed in the storage slot (<NUM>), the head support assembly (<NUM>) is allowed to be higher than the predetermined position.