Patent Description:
Existing child safety seats have only one function and are expensive. Most consumers have to purchase a baby carriage in addition to the child safety seat, and consequentially, the financial burden of consumers is increased, and it is extremely inconvenient to carry both the child safety seat and the baby carriage when the families go out.

In view of this, the applicant provides a frame folding mechanism in the previous application (<NUM>). The frame folding mechanism comprises a folding control assembly and a front-rear leg rotating assembly, wherein the folding control assembly comprises a bolt, a folding handle connected to the bolt through a folding steel wire, and a folding bolt spring arranged around the bolt; the front-rear leg rotating assembly comprises a first connecting piece and a second connecting piece arranged on a rear leg, the first connecting piece and the second connecting piece are coaxially and rotatably connected to a seat body, and bolt holes allowing the bolt to penetrate through to limit the first connecting piece and the second connecting piece are formed in the first connecting piece and the second connecting piece. When a frame is to be folded, the folding handle is pulled to draw the bolt to disengage from the bolt holes of the first connecting piece and the second connecting piece through a folding steel wire, and at this moment, the first connecting piece and the second connecting piece can rotate freely to fold a front leg assembly and a rear leg assembly; and finally, the folding handle is released, so that the bolt will be automatically inserted into the bolt holes under the resilience force of the bolt spring, and the frame is completely folded. Thus, the frame folding mechanism can be operated only by pulling the folding handle and rotating the front leg assembly and the rear leg assembly, so that operation is convenient.

However, this application has the defect that the seat body cannot be stably clamped on front and rear legs because the front and rear legs are folded on the same side.

<CIT> discloses an infant car seat, comprising: a base unit having straps to secure said base unit to an automobile seat; a seating unit; wherein said seating unit is removably coupled with said base unit; an extendable handle laterally traversing said seating unit and having two ends, each end connected to the proximal end of one of a pair of substantially parallel adjustable elongated members, wherein the distal end of each substantially parallel adjustable elongated members is pivotally connected to a lateral side of said seating unit; a pair of wheel assemblies each of which is connected to a lateral side of said seating unit, wherein each said wheel assembly further comprises.

The objective of the invention is to solve the problems mentioned in the description of related art by providing a folding and unfolding mechanism for front and rear leg assemblies of a frame. According to the folding and unfolding mechanism for front and rear leg assemblies of a frame, a rear leg assembly can be driven to be folded reversely when a front leg assembly is folded, that is, the front leg assembly and the rear leg assembly are folded on two sides of a seat body, so that the defect of the prior art that the seat body cannot be stably clamped on front and rear legs because the front and rear legs are folded on the same side is overcome.

The technical solution provided by the invention to fulfill the above objective is as follows:
A folding and unfolding mechanism for front and rear leg assemblies of a frame comprises a folding and unfolding control assembly and a front-rear leg rotating assembly. The front-rear leg rotating assembly comprises a rotating shaft, a rear leg assembly supporting rod and a rear leg assembly rotating rod, wherein the rotating shaft is arranged on a seat body and is used for rotatably connecting a front leg assembly to the seat body; the rear leg assembly supporting rod is used for connecting a rear leg assembly to the seat body; and the rear leg assembly rotating rod is arranged on the front leg assembly and is used for connecting the rear leg assembly to the front leg assembly, so that the rear leg assembly is driven to rotate reversely when the front leg assembly rotates around the rotating shaft.

Wherein, the folding and unfolding control assembly comprises a bolt and a folding handle, wherein the bolt is movably arranged on the seat body and is capable of penetrating through the front leg assembly and the rear leg assembly to fulfill limiting, and the folding handle is connected to the bolt through a folding steel wire to control the movement of the bolt.

In one embodiment, a connecting piece disposed around the rotating shaft is arranged at the end of the front leg assembly and is formed with a first unfolding limit hole and a folding limit hole; and a second unfolding limit hole is formed in the rear leg assembly, and when the front leg assembly and the rear leg assembly are unfolded, the bolt penetrates through the first unfolding limit hole and the second unfolding limit hole.

In one embodiment, a through hole allowing the rotating shaft to penetrate through is formed in the connecting piece, and a clamping protrusion extending towards the center is arranged in the through hole; and a clamping groove is formed in the rotating shaft towards the axis and is matched with the clamping protrusion to drive the rotating shaft to rotate synchronously when the front leg assembly rotates.

Preferably, a limiting groove is formed in the rotating shaft, and a limiting protrusion extends out of the end of the rear leg assembly and is matched with the limiting groove to fulfill limiting when the rear leg assembly is unfolded and to drive the rear leg assembly to be folded through the rotating shaft when the front leg assembly is folded.

Preferably, a folding limit groove is formed in the periphery of the connecting piece and is matched with the end, located on the rear leg assembly, of the rear leg assembly supporting rod, so that when the rear leg assembly is folded, the end of the rear leg assembly supporting rod is clamped in the folding limit groove to fulfill limiting.

In one embodiment, a limiting rod is arranged on the seat body, an arc groove is formed in the connecting piece, and the limiting rod penetrates through the arc groove to limit the rotating angle of the front leg assembly.

In one embodiment, the rear leg assembly supporting rod has an end rotatably connected to the seat body and an end rotatably connected to the rear leg assembly; and the rear leg assembly rotating rod has an end fixed to the front leg assembly and an end rotatably connected to the rear leg assembly.

To fulfill the above objective, the invention further provides a child safety seat which comprises a seat body, a front leg assembly hinged to the seat body, a rear leg assembly hinged to the front leg assembly, and the folding and unfolding mechanism for front and rear leg assemblies of a frame.

Compared with the prior art, the invention has the following effects:.

To explain the technical solution of the embodiments of the invention more clearly, the drawings used in the description of the embodiments are briefly described below.

To make the objectives, technical solutions and advantages of the embodiments of the invention clearer, the technical solution of the embodiments of the invention is clearly and completely described below in combination with the accompanying drawings of the embodiments. Clearly, the embodiments in the following description are only illustrative ones, and are not all possible ones of the invention. All other embodiments obtained by those ordinarily skilled in the art on the basis of these illustrative ones without creative labor should also fall within the protection scope of the invention.

It should be noted that the terms such as "center", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", "outer", "front" and "rear" in the description of the invention are used for indicating directional or positional relations on the basis of the drawings to facilitate and simplify the description of the invention, do not indicate or imply that devices or elements referred to must have specific directions or must be configured and operated in specific directions, and thus should not be interpreted as limitations of the invention. It should also be noted that the child safety seat of the invention is a <NUM>+ seat so that adults can push a baby carriage in the face of a child.

This embodiment provides a child safety seat which comprises a seat body <NUM>, a front leg assembly <NUM> hinged to the seat body <NUM>, a rear leg assembly <NUM> hinged to the front leg assembly <NUM>, and a folding and unfolding mechanism for front and rear assemblies of a frame, as shown in <FIG>. Wherein, the seat body <NUM> is an existing product, the structure of which is not specifically limited.

In this embodiment, the folding and unfolding mechanism comprises a folding and unfolding control assembly a front-rear leg rotating assembly, as shown in <FIG>. The folding and unfolding control assembly comprises a bolt <NUM> and a folding handle <NUM>.

The bolt <NUM> is horizontally and movably arranged on the seat body <NUM> and is able to penetrate through the front leg assembly <NUM> and the rear leg assembly <NUM> to fulfill limiting. The bolt <NUM> is connected to the folding handle <NUM> through a folding steel wire <NUM>, the folding handle <NUM> is rotatably arranged on the surface of the seat body <NUM> through a pin <NUM> sleeved with a torsion spring <NUM>, and a double lock <NUM> is arranged on the folding handle <NUM> through the pin <NUM> to prevent the seat body from being folded when the folding handle <NUM> is directly pulled by a child.

In this embodiment, the front-rear leg rotating assembly comprises a rotating shaft <NUM>, a rear leg assembly supporting rod <NUM> and a rear leg assembly rotating rod <NUM>.

As shown in <FIG>, the rotating shaft <NUM> is arranged on the seat body <NUM> and is used for hinging the front leg assembly <NUM> to the seat body <NUM>. Particularly, one end of the rotating shaft <NUM> stretches out of the seat body <NUM> to penetrate into a connecting piece <NUM>.

The bottom end of the rear leg assembly supporting rod <NUM> is rotatably connected to the rear leg assembly <NUM>, and the top end of the rear leg assembly supporting rod <NUM> is rotatably connected to the rear part of the seat body <NUM>. For example, as shown in <FIG>, the top end of the rear leg assembly supporting rod <NUM> is connected to the right side of the seat body <NUM> and is used for connecting the rear leg assembly <NUM> to the seat body <NUM>. Particularly, the bottom end of the rear leg assembly supporting rod <NUM> is rotatably connected to the rear leg assembly <NUM> through a rivet, the top end of the rear leg assembly supporting rod <NUM> is rotatably connected to the seat body <NUM> through a screw, and the rotatable connection manner is not limited to those mentioned herein.

The rear leg assembly rotating rod <NUM> is arranged on the front leg assembly <NUM>, and the right end of the rear leg assembly rotating rod <NUM> is rotatably connected to the rear leg assembly <NUM> to hinge the rear leg assembly <NUM> to the front leg assembly <NUM>. In this embodiment, the rear leg assembly rotating rod <NUM> provides a rotating force for the rear leg assembly <NUM>, and with the joint of the rear leg assembly supporting rod <NUM> and the rear leg assembly <NUM> as a rotating fulcrum, the rear leg assembly <NUM> rotates reversely when the front leg assembly <NUM> rotates around the rotating shaft <NUM>.

In this embodiment, the connecting piece <NUM> is arranged at the top end of the front leg assembly <NUM>. As shown in <FIG>, the connecting piece <NUM> is of a disc structure, a through hole allowing the rotating shaft <NUM> to penetrate through is formed in the center of the connecting piece <NUM>, and the connecting piece <NUM> is arranged around the rotating shaft <NUM> to hinge the front leg assembly <NUM> to the seat body <NUM>.

As shown in <FIG>, to ensure that the rear leg assembly <NUM> can rotate reversely when the front leg assembly <NUM> rotates around the rotating shaft <NUM>, a clamping protrusion <NUM> extending towards the center is arranged in the through hole, and a clamping groove <NUM>-<NUM> is formed in the rotating shaft <NUM> towards the axis, and the clamping groove <NUM>-<NUM> is matched with the clamping protrusion <NUM>, that is, the clamping protrusion <NUM> is inserted into the clamping groove <NUM>-<NUM>, so that when the front leg assembly <NUM> is unfolded/folded, the rotating shaft <NUM> will be driven to rotate synchronously. In this embodiment, a plurality of clamping protrusions <NUM> are arranged in the through hole, a plurality of clamping grooves <NUM>-<NUM> are formed in the rotating shaft, the clamping protrusions <NUM> are in one-to-one correspondence with the clamping grooves <NUM>-<NUM>, and the clamping protrusions <NUM> and the clamping grooves <NUM>-<NUM> are distributed uniformly, so that the rotating stability is guaranteed.

Furthermore, a limiting groove <NUM>-<NUM> is formed in the rotating shaft <NUM>, and a limiting protrusion <NUM> extends out of the top end of the rear leg assembly <NUM>. When the front and rear leg assemblies are in an unfolded state, the limiting protrusion <NUM> is clamped in the limiting groove <NUM>-<NUM> to limit the rear leg assembly <NUM>. When rotated to be folded, the front leg assembly <NUM> drives the connecting piece <NUM> to rotate, the connecting piece <NUM> drives the rotating shaft <NUM> to rotate synchronously through the cooperation of the clamping protrusions <NUM> and the clamping grooves <NUM>-<NUM>, and once the rotating shaft <NUM> rotates, the limiting protrusion <NUM> of the rear leg assembly <NUM> will be pushed to enable the rear leg assembly <NUM> to rotate anticlockwise, and then the rear leg assembly <NUM> is folded; and when the front leg assembly <NUM> continues to rotate to be folded, the rear leg assembly rotating rod <NUM> continues to press the top of the rear leg assembly <NUM> downwards, and the rear leg assembly <NUM> rotates anticlockwise around the rotating fulcrum, that is, the rear leg assembly <NUM> rotates reversely when the front leg assembly <NUM> rotates around the rotating shaft <NUM>.

In order to limit the front and rear leg assemblies at unfolded positions when the frame is in an unfolded state, a first unfolding limit hole <NUM> is formed in the connecting piece <NUM> as shown in <FIG>, a second unfolding limit hole <NUM> is formed in the top of the rear leg assembly <NUM> as shown in <FIG>, and the bolt <NUM> can penetrate through the first unfolding limit hole <NUM> and the second unfolding limit hole <NUM> to limit the rear leg assembly <NUM>.

In order to limit the front and rear leg assemblies at folded positions when frame is in a folded state, a folding limit hole <NUM> is formed in the connecting piece <NUM> as shown in <FIG>, and the bolt <NUM> can penetrate through the folding limit hole <NUM> to limit the front leg assembly <NUM> as shown in <FIG>.

In order to further limit the rear leg assembly <NUM>, a folding limit groove <NUM> is formed in the periphery of the connecting piece <NUM> as shown in FIG. <NUM>; and as shown in <FIG>, the folding limit groove <NUM> is matched with the end, located on the front leg assembly <NUM>, of the rear leg assembly supporting rod <NUM>, so that when the frame is folded, the end of the rear leg assembly supporting rod <NUM> is clamped in the folding limit groove <NUM> to limit the rear leg assembly <NUM>.

In this embodiment, in order to limit the rotating angle of the front leg assembly <NUM>, a limiting rod <NUM> is arranged on the seat body <NUM> as shown in <FIG>, an arc groove <NUM> is formed in the connecting piece <NUM>, the limiting rod <NUM> penetrates through the arc groove <NUM> to limit the rotating angle of the front leg assembly <NUM>, and the included angle between the first unfolding limit hole <NUM> and the folding limit hole <NUM> is matched with the radian of the arc groove <NUM>.

In this embodiment, the rear leg assembly <NUM> and the front leg assembly <NUM> have been recorded in detail in the previous application (<CIT>) of the applicant, and thus will no longer be described herein.

The operating principle of the invention is as follows: as shown in <FIG>, when the frame is in the unfolded, the bolt <NUM> is inserted into the first unfolding limit hole <NUM> and the second unfolding limit hole <NUM> to fulfill limiting; when the front and rear leg assemblies need to be folded, the folding handle <NUM> is pulled to drive the bolt <NUM> to disengage from the second unfolding limit hole <NUM> and the first unfolding limit hole <NUM> through the folding steel wire <NUM>, and at this moment, the front leg assembly <NUM> can rotate freely.

When the front leg assembly <NUM> clockwise rotates upwards, the connecting piece <NUM> drives the rotating shaft <NUM> to rotate synchronously to push the top of the rear leg assembly <NUM> to anticlockwise rotate downwards so as to continuously rotate and fold the front leg assembly <NUM>, and the rear leg assembly rotating rod <NUM> continues to press the top of the rear leg assembly <NUM> downwards to enable the rear leg assembly <NUM> to rotate anticlockwise around the rotating fulcrum, so that the front leg assembly <NUM> and the rear leg assembly <NUM> are folded synchronously.

When the front leg assembly and rear leg assembly are folded to be in the state shown in <FIG>, the joint of the rear leg assembly supporting rod <NUM> and the rear leg assembly <NUM> is clamped in the folding limit groove <NUM> to fulfill limiting, then the folding handle <NUM> is released, and the bolt <NUM> is inserted into the folding limit hole <NUM> under the effect of the bolt spring, so that the front leg assembly and the rear leg assembly are limited at the folded positions.

When the front leg assembly and the rear leg assembly need to be unfolded, the folding handle <NUM> is pulled again to push the bolt <NUM> out of the folding limit hole <NUM>, and then the rear leg assembly <NUM> is rotated.

Claim 1:
A folding and unfolding mechanism for front and rear leg assemblies of a frame, comprising a folding and unfolding control assembly and a front-rear leg rotating assembly, wherein the front-rear leg rotating assembly comprises:
a rotating shaft (<NUM>) adapted to be arranged on a seat body and used for rotatably connecting a front leg assembly (<NUM>) to the seat body;
a rear leg assembly supporting rod (<NUM>) adapted to be used for connecting a rear leg assembly to the seat body; and
a rear leg assembly rotating rod (<NUM>) arranged on the front leg assembly (<NUM>) and used for connecting the rear leg assembly to the front leg assembly, so that the rear leg assembly is driven to rotate reversely when the front leg assembly (<NUM>) rotates around the rotating shaft;
characterized in that the folding and unfolding control assembly comprises:
a bolt (<NUM>) adapted to be movably arranged on the seat body and capable of penetrating through the front leg assembly (<NUM>) and the rear leg assembly to fulfill limiting; and
a folding handle (<NUM>) connected to the bolt (<NUM>) through a folding steel wire (<NUM>) to control a movement of the bolt (<NUM>).