Patent Description:
With the improvement of people's awareness of driving safety, child safety seats have become a must-have for infants and children in vehicles. To prevent the child safety seat from moving due to inertia in a case such as sudden braking, a support leg is generally arranged at the front end of the base of the child safety seat. The support leg can be folded up when the child safety seat does not need to be used.

However, existing support legs may move forward and backward when a vehicle accident occurs, and the support leg cannot effectively support the child safety seat, resulting in low safety. <CIT> discloses a telescopic support leg which can move during use.

To solve at least one of the above problems, the present disclosure first provides a telescopic support leg locking structure, including a base, a support leg pedestal, and a support leg, where the support leg pedestal is slidably connected to the base, and the support leg is hingedly connected to the support leg pedestal; and the telescopic support leg locking structure further includes a secondary lock, where the support leg pedestal is provided with a chamber for the secondary lock to slide vertically, the secondary lock includes a locking tongue configured to abut against the support leg, the chamber is provided with a lower opening for the locking tongue to extend out therethrough, the base is provided with a locking hole, and when the support leg is separated from the locking tongue, the locking tongue is locked with the locking hole to restrict the support leg pedestal from moving forward and backward relative to the base.

Optionally, the base is provided with a first rail for the support leg pedestal to slide forward and backward, and a sliding column configured to engage with the first rail is arranged on the support leg pedestal.

Optionally, the sliding column is connected to a fastener configured to prevent the sliding column from disengaging from the first rail.

Optionally, a front end of the first rail is in communication with the locking hole.

Optionally, the locking tongue includes a locking portion and a sliding portion connected to a lower end of the locking portion, the locking portion is engaged with the locking hole when the locking tongue is locked with the locking hole, and the sliding portion is configured to be slidably connected to the first rail when the locking tongue is unlocked from the locking hole.

Optionally, the telescopic support leg locking structure further includes a connecting rod extending through the support leg pedestal, and the base is provided with a second rail configured to engage with the connecting rod.

Optionally, the support leg pedestal includes a lower cover and a fixing plate connected to each other, the chamber is arranged on the lower cover, and a restoring spring is arranged between the secondary lock and the fixing plate.

Optionally, a connecting portion is arranged at a top of the secondary lock, and a baffle plate configured to engage with the connecting portion is arranged at the lower opening.

Optionally, a plurality of slide grooves are provided in a circumferential direction of the connecting portion, and slide rails configured to slidably engage with the slide grooves are correspondingly arranged on an inner wall of the chamber.

Compared with the prior art, in the telescopic support leg locking structure of the present disclosure, the secondary lock configured to lock the support leg in an unfolded state with the base is arranged, and the locking tongue of the secondary lock can be unlocked from the locking hole of the base and locked with the locking hole of the base by folding and unfolding the support leg, respectively. Such a structure is simple and is convenient and reliable to operate, and ensures that the support leg in the unfolded state can remain in the state of being locked with the base. Therefore, the support leg can be prevented from retracting when a vehicle accident occurs, thereby ensuring that the support leg can effectively support a child safety seat and greatly improving the safety in use.

In addition, the present disclosure provides a child safety seat, including the telescopic support leg locking structure as described above.

Compared with the prior art, the child safety seat of the present disclosure has the same advantages as those of the telescopic support leg locking structure compared with the prior art, so the details will not be repeated herein.

List of reference numerals:
<NUM>. base; <NUM>. locking hole; <NUM>. first rail; <NUM>. second rail; <NUM>. support leg pedestal; <NUM>. lower cover; <NUM>. chamber; <NUM>. lower opening; <NUM>. baffle plate; <NUM>. slide rail; <NUM>. sliding column; <NUM>. fastener; <NUM>. fixing plate; <NUM>. upper cover; <NUM>. support leg; <NUM>. secondary lock; <NUM>. locking tongue; <NUM>. locking portion; <NUM>. sliding portion; <NUM>. connecting portion; <NUM>. slide groove; <NUM>. connecting rod; <NUM>. restoring spring.

To make the objectives, technical features, and advantages of the present disclosure more comprehensible, specific embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.

In the description of the present disclosure, it should be understood that orientation or position relationships indicated by the terms such as "upper" and "lower" are orientation or position relationships based on the normal use of the product.

The terms "first" and "second" are used herein for descriptive purposes, and are not intended to indicate or imply relative importance or implicitly point out the number of the indicated technical features. Therefore, the feature defined by "first" or "second" may explicitly or implicitly include at least one such feature. In the drawings of the embodiments of the present disclosure, a coordinate system XYZ is provided, where the positive direction of the X axis represents left, the negative direction of the X axis represents right, the positive direction of the Y axis represents front, the negative direction of the Y axis represents rear, the positive direction of the Z axis represents up, and the negative direction of the Z axis represents down.

An embodiment of the present disclosure provides a telescopic support leg locking structure. Referring to <FIG>, <FIG>, <FIG>, <FIG>, <FIG>, <FIG>, and <FIG>, the telescopic support leg locking structure includes a base <NUM>, a support leg pedestal <NUM>, and a support leg <NUM>. The support leg pedestal <NUM> is slidably connected to the base <NUM>. The support leg <NUM> is hingedly connected to the support leg pedestal <NUM>. The telescopic support leg locking structure further includes a secondary lock <NUM>. The support leg pedestal <NUM> is provided with a chamber <NUM> for the secondary lock <NUM> to slide vertically. The secondary lock <NUM> includes a locking tongue <NUM> configured to abut against the support leg <NUM>. The chamber <NUM> is provided with a lower opening <NUM> for the locking tongue <NUM> to extend out therethrough. The base <NUM> is provided with a locking hole <NUM>. When the support leg <NUM> is separated from the locking tongue <NUM>, the locking tongue <NUM> is locked with the locking hole <NUM> to restrict the support leg pedestal <NUM> from moving forward and backward relative to the base <NUM>.

The support leg pedestal <NUM> can move forward and backward relative to the base <NUM>. An upper end of the support leg <NUM> is hingedly connected to a front end of the support leg pedestal <NUM>. When the support leg <NUM> abuts against the locking tongue <NUM>, the locking tongue <NUM> is pushed upward, i.e., the secondary lock <NUM> is moved upward in the chamber <NUM>. After the secondary lock <NUM> is moved upward by a distance, the locking tongue <NUM> is unlocked from the locking hole <NUM>, and the secondary lock <NUM> can move in a front-rear direction along with the support leg pedestal <NUM>. During vertical movement, the locking tongue <NUM> always remains in a state of protruding out of the lower opening <NUM>. When the support leg <NUM> is separated from the locking tongue <NUM>, a length by which the locking tongue <NUM> protrudes from the lower opening <NUM> reaches a maximum value, to ensure that the locking tongue <NUM> can be locked with the locking hole <NUM>, thereby preventing the support leg pedestal <NUM> from moving forward and backward relative to the base <NUM>. That the support leg <NUM> is separated from the locking tongue <NUM> means a state in which the support leg <NUM> is rotated to unfold relative to the support leg pedestal <NUM>. When the locking tongue <NUM> is locked with the locking hole <NUM>, a position of the lower opening <NUM> corresponds to a position of the locking hole <NUM>.

According to the telescopic support leg locking structure of this embodiment, the secondary lock <NUM> configured to lock the support leg <NUM> in an unfolded state with the base <NUM> is arranged, and the locking tongue <NUM> of the secondary lock <NUM> can be unlocked from the locking hole <NUM> of the base <NUM> and locked with the locking hole <NUM> of the base <NUM> by folding and unfolding the support leg <NUM>, respectively. Such a structure is simple and is convenient and reliable to operate, and ensures that the support leg <NUM> in the unfolded state can remain in the state of being locked with the base <NUM>. Therefore, the support leg <NUM> can be prevented from retracting when a vehicle accident occurs, thereby ensuring that the support leg <NUM> can effectively support a child safety seat and greatly improving the safety in use.

Optionally, as shown in <FIG>, <FIG>, <FIG>, and <FIG>, the base <NUM> is provided with a first rail <NUM> for the support leg pedestal <NUM> to slide forward and backward, and a sliding column <NUM> configured to engage with the first rail <NUM> is arranged on the support leg pedestal <NUM>.

A length direction of the first rail <NUM> is consistent with the front-rear direction. The sliding column <NUM> is arranged at a rear end of the support leg pedestal <NUM>. A support leg <NUM> is hingedly connected to a front end of the support leg pedestal <NUM>. When the sliding column <NUM> moves to a rearmost end of the first rail <NUM>, the support leg <NUM> is in a folded state (as shown in <FIG>). When the sliding column <NUM> moves to a front-most end of the first rail <NUM>, the support leg <NUM> is in the unfolded state (as shown in <FIG>). When the support leg <NUM> abuts against the locking tongue <NUM>, the locking tongue <NUM> is pushed upward, and the locking tongue <NUM> can be moved into or out of the locking hole <NUM> in the front-rear direction. A rear side of the locking hole <NUM> is in communication with one end of the first rail <NUM> of the base <NUM>. When the support leg <NUM> is folded, the locking tongue <NUM> can be moved into the first rail <NUM>.

In this embodiment, with the design of the sliding column <NUM> and the first rail <NUM> that are slidably connected to each other, the slidable connection between the support leg pedestal <NUM> and the base <NUM> in the front-rear direction is realized, and the support leg pedestal <NUM> will not tilt during the sliding process.

Optionally, as shown in <FIG> and <FIG>, the sliding column <NUM> is connected to a fastener <NUM> configured to prevent the sliding column <NUM> from disengaging from the first rail <NUM>.

The fastener <NUM> is configured to limit the vertical movement of the sliding column <NUM> relative to the first rail <NUM>, i.e., prevent the support leg pedestal <NUM> from moving vertically relative to the base <NUM>. The fastener <NUM> is preferably a screw having a threaded rod and a screw cap. A diameter of the screw cap is greater than a width of the first rail <NUM> in a left-right direction. The screw cap is located below the first rail <NUM>. The threaded rod extends through the first rail <NUM> and is fixedly connected to the sliding column <NUM>.

Optionally, as shown in <FIG>, <FIG>, <FIG>, <FIG>, and <FIG>, a front end of the first rail <NUM> is in communication with the locking hole <NUM>, so that after the locking tongue <NUM> is unlocked from the locking hole <NUM>, the secondary lock <NUM> can move synchronously with the support leg pedestal <NUM>. This ensures that the support leg <NUM> and the support leg pedestal <NUM> can be smoothly moved forward and backward relative to the base <NUM>, thereby realizing the switching between the folded state and the unfolded state of the support leg <NUM>.

Optionally, as shown in <FIG>, <FIG>, <FIG>, <FIG>, <FIG>, <FIG>, and <FIG>, the locking tongue <NUM> includes a locking portion <NUM> and a sliding portion <NUM> connected to a lower end of the locking portion <NUM>, the locking portion <NUM> is engaged with the locking hole <NUM> when the locking tongue <NUM> is locked with the locking hole <NUM>, and the sliding portion <NUM> is configured to be slidably connected to the first rail <NUM> when the locking tongue <NUM> is unlocked from the locking hole <NUM>.

A width of the locking portion <NUM> in the left-right direction is greater than a width of the sliding portion <NUM> in the left-right direction, so that the locking tongue <NUM> is locked with the locking hole <NUM> when the locking portion <NUM> is engaged with the locking hole <NUM>, and the locking tongue <NUM> is unlocked from the locking hole <NUM> when the sliding portion <NUM> is engaged with the locking hole <NUM>. The width of the locking portion <NUM> in the left-right direction is greater than a width of the first rail <NUM> in the left-right direction, so that when the locking tongue <NUM> is locked with the locking hole <NUM>, the support leg <NUM> is prevented from retracting when impacted by an external force. The width of the slide portion <NUM> in the left-right direction is less than the width of the first rail <NUM> in the left-right direction, so that the support leg pedestal <NUM> can move forward and backward relative to the base <NUM> when the support leg <NUM> is retracted.

In this embodiment, the design of the locking tongue <NUM> as two structures, i.e., the locking portion <NUM> and the sliding portion <NUM>, not only ensures that the locking tongue <NUM> is locked with the locking hole <NUM> when the support leg <NUM> is retracted, but also ensures that the locking tongue <NUM> can be unlocked smoothly from the locking hole <NUM> when the support leg <NUM> is folded, without affecting the forward and backward movement of the support leg pedestal <NUM> relative to the base <NUM>.

Optionally, as shown in <FIG>, <FIG>, and <FIG>, the telescopic support leg locking structure further includes a connecting rod <NUM> extending through the support leg pedestal <NUM>, and the base <NUM> is provided with a second rail <NUM> configured to engage with the connecting rod <NUM>.

The connecting rod <NUM> is of a smooth cylindrical structure, and during the forward and backward movement process, the support leg pedestal <NUM> can drive the connecting rod <NUM> to move synchronously in the second rail <NUM>. In this way, the support leg pedestal <NUM> can stably move forward and backward relative to the base <NUM>.

Optionally, as shown in <FIG>, <FIG>, and <FIG>, the support leg pedestal <NUM> includes a lower cover <NUM> and a fixing plate <NUM> connected to each other, the chamber <NUM> is arranged on the lower cover <NUM>, and a restoring spring <NUM> is arranged between the secondary lock <NUM> and the fixing plate <NUM>.

The secondary lock <NUM> is provided with a mounting hole for arranging one end of the restoring spring <NUM>. An upper end of the restoring spring <NUM> abuts against the fixing plate <NUM>. When the support leg <NUM> is unfolded, the restoring spring <NUM> pushes the secondary lock <NUM> to move downward in a timely manner. The support leg pedestal <NUM> further includes an upper cover <NUM>. The fixing plate <NUM> is arranged between the upper cover <NUM> and the lower cover <NUM>. The upper cover <NUM> and the lower cover <NUM> are fixedly connected to each other by a fastener. The lower cover <NUM> is preferably made of plastic, and the fixing plate <NUM> is preferably made of metal, to minimize the overall weight of the child safety seat while ensuring the deformation resistance of the support leg pedestal <NUM>.

Optionally, as shown in <FIG>, a connecting portion <NUM> is arranged at a top of the secondary lock <NUM>, and a baffle plate <NUM> configured to engage with the connecting portion <NUM> is arranged at the lower opening <NUM>.

The secondary lock <NUM> moves downward rapidly under an elastic force of the restoring spring <NUM>, so that the connecting portion <NUM> strikes the baffle plate <NUM> and makes a clicking sound, indicating that the secondary lock has been mounted in place. The arrangement of the baffle plate <NUM> can also prevent the secondary lock <NUM> from being disengaged from the chamber <NUM>.

Optionally, as shown in <FIG>, a plurality of slide grooves <NUM> are provided in a circumferential direction of the connecting portion <NUM>, and slide rails <NUM> configured to slidably engage with the slide grooves <NUM> are correspondingly arranged on an inner wall of the chamber <NUM>.

Four slide grooves <NUM> are provided, the four slide grooves <NUM> are symmetrically arranged, and correspondingly four slide rails <NUM> are also provided. In this embodiment, the structure in which the slide grooves <NUM> and the slide rails <NUM> are engaged with each other is designed between the connecting portion <NUM> and the chamber <NUM>, so that the locking tongue <NUM> can move straight up and down, thereby ensuring the stability and reliability of the locking function of the secondary lock <NUM>.

As shown in <FIG>, when the support leg <NUM> is pulled to the outermost position, the restoring spring <NUM> is engaged into the locking hole <NUM> to lock the secondary lock <NUM>, so that the support leg <NUM> cannot move forward and backward. When a vehicle accident occurs, the support leg <NUM> can be well controlled to support the child safety seat to protect the child in the child safety seat, i.e., the support leg <NUM> is restricted from telescoping forward and backward freely.

As shown in <FIG>, <FIG>, and <FIG>, when the support leg <NUM> needs to be retracted, the support leg <NUM> is first folded backward to a certain angle, so that the support leg <NUM> abuts against the secondary lock <NUM>. The support leg <NUM> is continuously folded backward. In this case, the secondary lock <NUM> is under the compression of the support leg <NUM>, and the locking portion <NUM> of the secondary lock <NUM> has been disengaged from the locking hole <NUM>, so that the support leg <NUM> can be moved backward and retracted.

Another embodiment of the present disclosure provides a child safety seat, including the telescopic support leg locking structure as described above.

According to the child safety seat of this embodiment, the secondary lock <NUM> configured to lock the support leg <NUM> in an unfolded state with the base <NUM> is arranged, and the locking tongue <NUM> of the secondary lock <NUM> can be unlocked from the locking hole <NUM> of the base <NUM> and locked with the locking hole <NUM> of the base <NUM> by folding and unfolding the support leg <NUM>, respectively. Such a structure is simple and is convenient and reliable to operate, and ensures that the support leg <NUM> in the unfolded state can remain in the state of being locked with the base <NUM>. Therefore, the support leg <NUM> can be prevented from retracting when a vehicle accident occurs, thereby ensuring that the support leg <NUM> can effectively support a child safety seat and greatly improving the safety in use.

Claim 1:
A telescopic support leg locking structure, comprising a base (<NUM>), a support leg pedestal (<NUM>), and a support leg (<NUM>), wherein the support leg pedestal (<NUM>) is slidably connected to the base (<NUM>), and the support leg (<NUM>) is hingedly connected to the support leg pedestal (<NUM>); and the telescopic support leg locking structure further comprises a secondary lock (<NUM>), wherein the support leg pedestal (<NUM>) is provided with a chamber (<NUM>) for the secondary lock (<NUM>) to slide vertically, the secondary lock (<NUM>) comprises a locking tongue (<NUM>) configured to abut against the support leg (<NUM>), the chamber (<NUM>) is provided with a lower opening (<NUM>) for the locking tongue (<NUM>) to extend out therethrough, the base (<NUM>) is provided with a locking hole (<NUM>), and when the support leg (<NUM>) is separated from the locking tongue (<NUM>), the locking tongue (<NUM>) is locked with the locking hole (<NUM>) to restrict the support leg pedestal (<NUM>) from moving forward and backward relative to the base (<NUM>).