CN108327770A - Pushchair - Google Patents

Abstract

This application discloses Pushchair, including two groups of wheel group framves, two support the front lower link, two support the front upper connecting rod, two hinged elastic joints, two joint unlocking structures, one group of bottom cross-articulation component, two groups of support articulated linkage components and one group of inclination cross-articulation component.The application is matched by joint unlocking structure with hinged elastic joint to realize that clamping lock fixes the preceding lower link of expansion and preceding upper connecting rod, or the function of upper connecting rod before prestack lower link is stated is received in unlock, then it realizes to link by bottom hinge assembly and support articulated linkage component and inclination cross-articulation component again and receives the folded or preceding upper connecting rod of the expansion that links and preceding lower link and wheel group frame, achieve the purpose that receipts are folded regular to which poststack can not only be received in vehicle, and it can be by supporting articulated linkage component to achieve the purpose that further increase vehicle rigidity when vehicle is unfolded, and then embody the application go out it is easy to carry, harvesting does not take up space, and there is the protrusion effect of high degree of rigidity upon deployment.

Description

pushchair

【Technical field】

The present application relates to the technical field of strollers, in particular to a foldable stroller.

【Background technique】

From birth to childhood, babies need to use many equipment to assist their lives because their limbs are not yet fully developed. For example, in order to provide assistance for infants and young children who cannot walk for a long time or are still learning to walk when they go out, and reduce the burden of parents holding them for a long time, baby strollers are very important equipment for babies or young children at this stage when they go out.

One of the most important functions of existing baby strollers is the folding problem. Since the baby stroller is quite bulky when unfolded, if it cannot be folded and reduced in size, it will not only take up space at home, but it is also difficult to put it in the trunk of a car or take it on a public transport tool when going out.

However, after taking a general look at the baby strollers on the market, although they can be reduced in size compared to when they are unfolded, they are still not neat enough to further reduce the volume after folding; and there is still a problem of insufficient rigidity when the whole cart is unfolded. .

【Content of invention】

In order to solve the above technical problems, the present application provides a foldable stroller.

In order to solve the above technical problems, the application is realized through the following technical solutions:

The foldable stroller includes two sets of wheel sets, two front lower links, two front upper links and two hinged elastic joints, the lower ends of the front lower links are hinged to the front ends of the wheel sets and When unfolding work, it is in a backward tilting state, and the hinged elastic joint is connected between its upper end and the lower end of the front upper link, and then when the hinged elastic joint is in a loose state, the front upper link The hinged elastic joint is rotated and folded close to the front lower link;

The foldable stroller also includes two joint unlocking structures, a set of bottom cross hinge assemblies, two sets of support hinge link assemblies and a set of inclined cross hinge assemblies;

The joint unlocking structure is arranged on the front upper link and connected with the hinged elastic joint, and is used to release the hinged elastic joint;

The bottom cross hinge assembly is cross-hinged between the two wheel frames, and is used to drive the two wheel frames to fold inward, or to support and unfold the two wheel frames;

The support hinge link assembly is hinged between the wheel frame and the front lower link, and it includes a support hinge connector, an auxiliary support hinge and a connecting slider, and the connecting slider is sleeved on the on the wheel frame, and can reciprocate and slide along the longitudinal direction of the wheel frame; the supporting hinge joint is hinged between the wheel frame and the front lower link, and when it is deployed, it is standing state; the auxiliary support hinge is hinged between the support hinge and the connecting slide, and when it is deployed, it is in a forward tilted state; the support hinge and the auxiliary support hinge and When the connecting slider cooperates, it can be used to pull the front lower link to rotate around its hinged lower end and fold it down close to the upper side of the wheel frame, or it can be used to support the front lower link around its hinged lower end. Rotate and expand upward so that the front lower link is in an unfolded working state;

The inclined cross hinge assembly is cross-hinged between the support hinge connection part and the wheel frame, and is used to assist in supporting the support hinge connection part in an upright state.

As described above, the foldable stroller, the hinged elastic joints include:

The outer connecting piece, the lower end of which is connected to the upper end of the front lower link, and the inner side of which is provided with a first inner concave tooth groove arranged transversely;

The inner connecting piece, its upper end is connected with the lower end of the front upper link, and is hinged with the outer connecting piece, and its inner side is provided with a second inner concave tooth groove arranged transversely, and the second inner concave tooth groove A plurality of slope protrusions are arranged around the transverse direction thereof;

A locking gear, which is sheathed between the outer connecting piece and the inner connecting piece, and cooperates with the first inner concave tooth groove and the second inner concave tooth groove, for locking the an outer connector and said inner connector;

Push the unlocking part, which is sleeved in the second inner concave tooth groove, and is adapted to the slope protrusion, and is located between the second inner concave tooth groove and the locking gear. push the locking gear to move into the first concave tooth groove until the locking gear breaks away from the second concave tooth groove, so as to unlock the outer connecting piece and the inner connecting piece ;

An elastic reset member, which is sheathed on the locking gear, and is located between the locking gear and the first concave tooth groove, and when the pushing unlocking member loses its support on the locking gear top When pushed, the elastic reset member is used to elastically reset the locking gear and move between the first inner concave tooth groove and the second inner concave tooth groove.

According to the foldable stroller as described above, the hinged elastic joint further includes a decoration part arranged on the outside of the outer connecting part and used for decoration.

In the foldable stroller as described above, the push unlocking member is provided with a plurality of contact protrusions along its peripheral direction, which can be in contact with the slope protrusions, and the upper opening is also provided with a locking recess. .

As described above, the foldable stroller, the joint unlocking structure includes:

An elongated hole is opened on the upper part of the front upper link and runs through the front upper link transversely;

A pull-up component, which is sleeved on the outer side of the upper part of the front upper link, and can slide up and down along the length direction of the front upper link, and is provided with a transverse through-hole;

a connecting pin, which is sequentially connected through the elongated hole and the transverse through hole;

The connecting rope is sheathed in the front upper link, and its lower end protrudes from the lower end of the front upper link and is clamped in the clamping recess, and the upper end is sleeved on the connecting pin. When the pull-up part is pulled up along the length direction of the front upper link, the connecting pin is driven by the pull-up part to move from the lower end of the transverse through hole to the upper end of the transverse through hole, thereby driving the The connecting rope drives the push unlocking part to rotate from the low end of the slope protrusion to the high end of the slope protrusion, and then pushes the locking gear into the first inner concave tooth groove.

The foldable baby carriage as described above, the foldable baby carriage further includes a centering elastic structure, the middleward elastic structure is arranged between the two front upper links, and is used to release the two front upper links. The upper link enables the two front upper links to be folded inward, or is used to support, unfold and lock the two front upper links.

As for the foldable stroller as described above, the centering elastic structure includes a first transverse connecting rod and a second transverse connecting rod hinged between the two front upper connecting rods, the inner end of the first transverse connecting rod is connected to the The inner ends of the second transverse link are hinged and located on the upper side of the second transverse link;

The upper side of the inner end of the first transverse link is provided with a first downward groove that is concave downward, and the lower side of the inner end is provided with an upward groove that is concave upward. The downward protruding post is protruding, and the inner side is provided with a first protrusion protruding toward the direction of the downward protruding post, the number of the first protrusions is at least 2, and the first protrusion is adjacent to the first There are up and down through holes between the protrusions to communicate with the first downward groove and the upward groove;

The upper side of the inner end of the second transverse connecting rod is provided with a second downward groove which is concave downward, and the middle part of the second downward groove is provided with an upward convex and coaxial with the downward protrusion. An upward protruding column, and the inner side thereof is provided with a second protrusion protruding toward the direction of the upward protruding column, and the number of the second protrusion is equal to that of the first protrusion;

The inward elastic structure also includes:

an elastic push piece, which is sheathed on the upward protruding post;

The locking position piece is sleeved between the downward protrusion and the upward protrusion, is located in the accommodation space formed by the upward groove and the second downward groove, and is located in the Above the elastic push piece, there is a button on it that can fit with the first protrusion and the second protrusion to lock and fasten the first transverse link and the second transverse link. lock slot;

The unlocking button is sleeved in the first downward groove, and its lower end extends through the upper and lower through holes and is located in the upward groove, and is used to push down the locking positioner to force the elastic top The push piece is retracted downwards to move the locking position piece downwards into the second downward groove, and then the locking notch disengages from the first protrusion, thereby releasing the first transverse direction. connecting rod and the second transverse connecting rod.

In the foldable stroller as described above, the lower end of the unlock button is provided with an outwardly extending limiting portion whose number is equal to the number of the upper and lower through holes, and the radial dimension of the outer extending limiting portion is larger than that of the upper and lower through holes. radial size.

According to the foldable stroller as described above, the foldable stroller further includes a seat support bracket arranged inside the front lower link and the supporting hinged joint and used to support the baby seat.

Compared with the prior art, the above-mentioned application has the following advantages:

1. The foldable baby stroller of this application cooperates with the hinged elastic joint through the joint unlocking structure to realize locking and fixing, unfolding the front lower link and the front upper link, or unlocking and folding the front lower The function of the connecting rod and the front upper link, and then through the bottom hinge assembly, the support hinge link assembly and the inclined cross hinge assembly to realize the linkage folding or linkage unfolding of the front upper linkage It is assembled with the front lower link and the wheel, so that not only can the whole vehicle be folded neatly after being folded, but also the rigidity of the whole vehicle can be further improved through the support hinged link assembly when the whole vehicle is unfolded. Purpose, and then reflects the outstanding effect of the application being easy to carry when going out, not occupying space for storage, and having high rigidity when unfolded;

2. When the foldable stroller of the present application is unfolded, the supporting hinged joint is auxiliary supported by the auxiliary supporting hinge, so that the force received by the supporting hinged joint is indirectly supported by the auxiliary supporting hinge. Acting on the wheel group frame, so as to further improve the vehicle rigidity of the foldable stroller of the present application, and can be used for Pull the front lower link to rotate around its hinged lower end and fold it down close to the upper side of the wheel frame, or it can be used to support the front lower link to rotate and expand upwards around its hinged lower end to make the front lower link The rod is in the unfolded working state, which further embodies the prominent features of the supporting hinged link assembly in the foldable stroller of the present application, such as exquisite structure, smooth movement, and simple and convenient operation.

【Description of drawings】

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

Fig. 1 is a perspective view of the foldable stroller of the present application, showing that the foldable stroller of the present application is in an unfolded working state.

Fig. 2 is a perspective view of the foldable stroller of the present application, showing a position state of the foldable stroller of the present application during unfolding.

Fig. 3 is a perspective view of the foldable stroller of the present application, showing that the foldable stroller of the present application is in a fully folded state.

Fig. 4 is a sectional view of the foldable stroller of the present application, showing the installation state of the joint unlocking structure.

Fig. 5 is an exploded view of the hinged elastic joint in the foldable stroller of the present application.

Fig. 6 is a partial enlarged view I of Fig. 5 .

Fig. 7 is an exploded view of the hinged elastic joint in the foldable stroller of the present application.

Fig. 8 is a perspective view of the pushing unlocking part in the foldable stroller of the present application.

Fig. 9 is an exploded view of the centering elastic structure in the foldable stroller of the present application.

Fig. 10 is a broken perspective view of the first transverse link in the foldable stroller of the present application.

Fig. 11 is a perspective view of the unlocking button in the pushchair of the present application.

【Detailed ways】

The present application will be described in further detail below through specific embodiments in conjunction with the accompanying drawings.

As shown in Figure 1-11, the foldable stroller includes two sets of wheel sets 1, two front lower links 2, two front upper links 3, two hinged elastic joints 4, and two joint unlocking structures 5 , a centering elastic structure 6 , a set of bottom cross hinge assemblies 7 , two sets of support hinge link assemblies 8 , a set of inclined cross hinge assemblies 9 and seat support brackets 10 .

Specifically, the lower end of the front lower link 2 is hinged to the front end of the wheel frame 1 and is in a backward tilting state when it is unfolded, and the upper end is connected to the lower end of the front upper link 3 by the Hinge the elastic joint 4, and then when the hinged elastic joint 4 is in a loose state, the front upper link 3 rotates through the hinged elastic joint 4 and folds close to the front lower link 2. The joint unlocking structure 5 is arranged on the front upper link 3 and connected with the hinged elastic joint 4 , and is used for releasing the hinged elastic joint 4 . The bottom cross hinge assembly 7 is cross-hinged between the two wheel frames 1 , and is used to drive the two wheel frames 1 to fold inward, or to support and unfold the two wheel frames 1 . The support hinge link assembly 8 is hinged between the wheel frame 1 and the front lower link 2 , and it includes a support hinge connection 81 , an auxiliary support hinge 82 and a connecting slide 83 . The connecting slider 83 is sheathed on the wheel frame 1 and can slide back and forth along the longitudinal direction of the wheel frame 1 . The supporting hinged connecting member 81 is hinged between the wheel frame 1 and the front lower link 2, and when it is deployed, it is in an upright state. The auxiliary support hinge 82 is hinged between the support hinge connection 81 and the connecting slide 83 , and when it is deployed, it is in a forward tilted state. When the supporting hinged connecting piece 81 cooperates with the auxiliary supporting hinged piece 82 and the connecting slider 83, it can be used to pull the front lower link 2 to rotate around its hinged lower end and fold it down close to the wheel set. The upper side of the frame 1 may be used to support the front lower link 2 to rotate and expand upward around its hinged lower end so that the front lower link 2 is in a deployed working state. The inclined cross hinge assembly 9 is hinged cross-hinged between the supporting hinged connector 81 and the wheel frame 1 , and is used to assist in supporting the supporting hinged connector 81 in an upright state. Both the bottom cross-hinge assembly 7 and the inclined cross-hinge assembly 9 are formed by two connecting rods cross-hinged to realize the unfolding or folding function.

The collapsible stroller of the present application cooperates with the hinged elastic joint 4 through the joint unlocking structure 5 to realize latching and fixing. Expand the front lower link 2 and the front upper link 3, or unlock and fold the The functions of the front lower link 2 and the front upper link 3, and then through the bottom hinge assembly 7, the support hinge link assembly 8 and the inclined cross hinge assembly 9 realize linkage folding or linkage Expand the front upper link 3, the front lower link 2 and the wheel frame 1, so that not only can the whole vehicle be folded neatly, but also can be hinged through the support when the whole vehicle is unfolded. The connecting rod assembly 8 achieves the purpose of further improving the rigidity of the whole vehicle, and further embodies the outstanding effects of the application being easy to carry when going out, not occupying space for storage, and having a high degree of rigidity when unfolded.

The hinged elastic joint 4 includes an outer connecting piece 41 , an inner connecting piece 42 , a locking gear 43 , a pushing unlocking piece 44 , an elastic return piece 45 and a decorative part 46 .

The lower end of the outer connecting member 41 is connected to the upper end of the front lower link 2 , and a first inner concave tooth groove 411 arranged transversely is opened on the inner side thereof. The upper end of the inner connecting member 42 is connected with the lower end of the front upper link 3 and is hinged with the outer connecting member 41, and the inner side thereof is provided with a second inner concave tooth groove 421 arranged transversely. A plurality of slope protrusions 4211 are arranged in the concave tooth groove 421 around its transverse direction. The locking gear 43 is sleeved between the outer connecting piece 41 and the inner connecting piece 42, and cooperates with the first inner concave tooth groove 411 and the second inner concave tooth groove 421, for To lock the outer connecting piece 41 and the inner connecting piece 42 . The push unlocking member 44 is sleeved in the second inner concave tooth groove 421, and fits with the slope protrusion 4211, and is located between the second inner concave tooth groove 421 and the locking gear. 43, used to push the locking gear 43 to move into the first concave tooth groove 411 until the locking gear 43 breaks away from the second concave tooth groove 421, so as to unlock the The outer connecting piece 41 and the inner connecting piece 42 . The elastic reset member 45 is sheathed on the locking gear 43 and is located between the locking gear 43 and the first concave tooth groove 411 , and when the pushing unlocking member 44 loses alignment with the locking gear 43 When the locking gear 43 pushes, the elastic reset member 45 is used to elastically reset the locking gear 43 and move between the first concave tooth groove 411 and the second concave tooth groove 421 .

The decoration component 46 is disposed on the outside of the outer connecting member 41 and used for decoration. The decorative component 46 can be a flashing LED light, or other decorative decorative objects, the purpose of which is to improve the aesthetic appearance of the application.

The pushing unlocking member 44 is provided with a plurality of contact protrusions 441 along its peripheral direction, which can contact with the slope protrusions 4211 , and also has a locking recess 442 on it.

The joint unlocking structure 5 includes an elongated hole, a pull-up component 51 , a connecting pin and a connecting rope 52 .

The elongated hole is opened on the upper part of the front upper link 3 and runs through the front upper link 3 transversely. The pull-up member 51 is sheathed on the outer side of the upper part of the front upper link 3, and can slide up and down along the length direction of the front upper link 3, and is provided with a transverse through hole extending transversely therethrough. The connecting pins are sequentially connected to the elongated hole 51 and the transverse through hole. The connecting rope 52 is sheathed in the front upper link 3, and its lower end protrudes from the lower end of the front upper link 3 and is clamped in the clamping recess 442, and the upper end is sleeved in the connecting rod 3. On the bolt, when the pull-up member 51 is pulled up along the length direction of the front upper link 3, the connecting bolt is driven by the pull-up member 51 to move from the lower end of the transverse through hole to the transverse through hole. The upper end of the hole, so as to drive the connecting rope 52 to drive the push unlocking member 44 to rotate from the low end of the ramp protrusion 4211 to the high end of the ramp protrusion 4211, and then push the locking gear 43 to the upper end of the ramp protrusion 4211. Inside the first concave tooth groove 411 .

The inward elastic structure 6 is arranged between the two front upper links 3, and is used to loosen the two front upper links 3 to make the two front upper links 3 fold inward, or use Expand and lock the two front upper links 3 with support. The inward elastic structure 6 includes a first transverse connecting rod 61 and a second transverse connecting rod 62 hinged between the two front upper connecting rods 3 , and the inner end of the first transverse connecting rod 61 is connected to the second transverse connecting rod 62 . The inner ends of the connecting rods 62 are hinged and located on the upper side of the second transverse connecting rod 62 .

The upper side of the inner end of the first transverse connecting rod 61 is provided with a first downward groove 611 concaved downwards, and the lower side of the inner end is provided with an upward groove 612 concaved upwards. The upward groove 612 A downward protruding post 613 is provided in the middle, and a first protrusion 614 protruding toward the direction of the downward protruding post 613 is provided on the inner side thereof, and the number of the first protrusions 614 is at least two , and adjacent to the first protrusion 614 is provided with an up and down through hole 615 penetrating up and down to communicate with the first downward groove 611 and the upward groove 612 .

The upper side of the inner end of the second transverse connecting rod 62 is provided with a second downward groove 621 that is concave downward, and the middle part of the second downward groove 621 is provided with an upward protrusion and is aligned with the downward protrusion. 613 is coaxial with the upward protrusion 622 , and the inner side thereof is provided with second protrusions 623 protruding toward the direction of the upward protrusion 622 , the number of the second protrusions 623 is equal to that of the first protrusions 614 .

The inward elastic structure 6 further includes an elastic push piece 63 , a locking position piece 64 and an unlock button 65 .

The elastic pushing member 63 is sleeved on the upward protrusion 622 . The locking position member 64 is sleeved between the downward protrusion 613 and the upward protrusion 622 , and is located in the accommodation space formed by the upward groove 612 and the second downward groove 621 , and is located above the elastic push piece 63, and there is provided on it that can fit with the first protrusion 614 and the second protrusion 623 to lock and fasten the first transverse connecting rod 61 and the locking notch 641 of the second transverse link 62 . The unlocking button 65 is sleeved in the first downward groove 611 , and its lower end extends through the upper and lower through holes 615 and is located in the upward groove 612 , so as to push down the locking positioner 64 Forcing the elastic pushing member 63 to contract downwards so that the locking position member 64 moves down into the second downward groove 621 , and then the locking notch 641 disengages from the first protrusion 614, so as to loosen the first transverse link 61 and the second transverse link 62.

The lower end of the unlocking button 65 is provided with an outwardly extending limiting portion 651 whose number is equal to that of the upper and lower through holes 615 . .

The seat support bracket 10 is arranged inside the front lower link 2 and the support hinge connection part 81 and is used to support the baby seat.

In summary, the embodiments of the present application have been described in detail, but the present application is not limited to the above embodiments. Even if it makes various changes to the application, it still falls within the protection scope of the application.

Claims (9)

1. Pushchair, including two groups of wheel group framves (1), two support the front lower link (2), two support the front upper connecting rod (3) and two A hinged elastic joint (4), preceding lower link (2) lower end is hinged and is organizing work with wheel group frame (1) front end When, the hinged elastic joint (4) is connected in the state of tilting backwards, and between the upper end and the preceding upper connecting rod (3) lower end, after And when the hinged elastic joint (4) is in and loosens state, the preceding upper connecting rod (3) passes through the hinged elastic joint (4) It rotates and receives to fold and be close to the preceding lower link (2), it is characterised in that：The Pushchair further includes two joints Unlocking structure (5), one group of bottom cross-articulation component (7), two groups of support articulated linkage components (8) and one group of inclination intersect hinge Connected components (9)；

The joint unlocking structure (5) is set on the preceding upper connecting rod (3) and is connected with the hinged elastic joint (4), and To the hinged elastic joint (4) of loosening；

Bottom cross-articulation component (7) cross-articulation is between the two wheel group framves (1), and to drive described in two The two wheel group framves (1) are unfolded to middle folding, or to support in wheel group frame (1)；

The support articulated linkage component (8) is articulated between the wheel group frame (1) and the preceding lower link (2), and it is wrapped Support articulated joints (81), Auxiliary support articulation piece (82) and connection slide cartridge (83), the connection slide cartridge (83) is included to be arranged In on the wheel group frame (1), and can reciprocatingly slide along wheel group frame (1) longitudinal direction；The support articulated joints (81) it is articulated between the wheel group frame (1) and the preceding lower link (2), and when it is organized work, is in erected state；It is described auxiliary Support articulation piece (82) is helped to be articulated between the support articulated joints (81) and the connection slide cartridge (83), and it is organized work When, in the state of turning forward；The support articulated joints (81) and the Auxiliary support articulation piece (82) and the connection are slided Cylinder (83) can be used to pull the preceding lower link (2) to be hinged around it when matching rotation downward receipts in lower end are folded to be close to the wheel On the upside of group frame (1), or it can be used to support the preceding lower link (2) to be hinged lower end rotation around it and be unfolded upwards so that the front lower company Bar (2) is in state of organizing work；

Inclination cross-articulation component (9) cross-articulation is in the support articulated joints (81) and the wheel group frame (1) Between, and to support articulated joints (81) to be in erected state described in Auxiliary support.

2. Pushchair according to claim 1, it is characterised in that：The hinged elastic joint (4) includes：

Outer connectors (41), lower end be connected with preceding lower link (2) upper end, and its inside offers and is laterally arranged First indent tooth socket (411)；

Medial connection (42), the upper end are connected with preceding upper connecting rod (3) lower end, and with the outer connectors (41) phase It is hinged, and its inside offers the second indent tooth socket (421) being laterally arranged, the second indent tooth socket (421) is interior around its cross It is raised (4211) it to be equipped with multiple slopes to direction；

Clamping lock gear (43) is sheathed between the outer connectors (41) and the medial connection (42), and with it is described First indent tooth socket (411) and the second indent tooth socket (421) match, to outer connectors described in clamping lock (41) and institute State medial connection (42)；

Pushing tow unlock piece (44) is sheathed in the second indent tooth socket (421), and is mutually fitted with the slope raised (4211) Match, and between the second indent tooth socket (421) and the clamping lock gear (43), to clamping lock gear (43) described in pushing tow It is moved into the first indent tooth socket (411), until the clamping lock gear (43) is detached from the second indent tooth socket (421), So as to unlock the outer connectors (41) and the medial connection (42)；

Dynamic clamping head and quiet clamping head (45) is sheathed on the clamping lock gear (43), and positioned at the clamping lock gear (43) and described the Between one indent tooth socket (411), and when the pushing tow unlock piece (44) loses to clamping lock gear (43) thrusting action, institute State dynamic clamping head and quiet clamping head (45) to clamping lock gear (43) described in elastic reset be moved to the first indent tooth socket (411) with it is described Between second indent tooth socket (421).

3. Pushchair according to claim 2, it is characterised in that：The hinged elastic joint (4) further includes setting Decorative element (46) on the outside of the outer connectors (41) and to decorate.

4. Pushchair according to claim 2, it is characterised in that：The pushing tow unlock piece (44) was along its week side To being equipped with multiple contact projections (441) that can be in contact with the slope raised (4211), and open that be additionally provided with clamping recessed thereon Position (442).

5. Pushchair according to claim 4, it is characterised in that：The joint unlocking structure (5) includes：

Elongated hole is opened in preceding upper connecting rod (3) top, and extends transversely through the preceding upper connecting rod (3)；

Component (51) is pulled up, is sheathed on preceding upper connecting rod (3) upper outside, and can be along preceding upper connecting rod (3) the length side To sliding up and down, and offer thereon extend transversely through extend transversely through hole；

Connecting bolt sequentially passes through and is connected to the elongated hole (51) and described extends transversely through on hole；

Rope (52) is connected, is sheathed in the preceding upper connecting rod (3), and preceding upper connecting rod (3) lower end is stretched out simultaneously in its lower end It is connected in the clamping recess (442), upper end is sheathed on the connecting bolt, when along preceding upper connecting rod (3) the length side When pulling up pull-up component (51), the connecting bolt is driven by the pull-up component (51) and extends transversely through hole from described Lower end be moved to it is described extend transversely through hole upper end, to drive connection rope (52) drive pushing tow unlock piece (44) from The low side on the slope raised (4211) turns to the high-end of the slope raised (4211), and then by the clamping lock gear (43) In pushing tow to the first indent tooth socket (411).

6. Pushchair according to claim 1, it is characterised in that：The Pushchair further include one to Middle loosing and tightening structure (6), it is described to middle loosing and tightening structure (6) be set to the two preceding upper connecting rods (3) between, and to loosen two it is described before Upper connecting rod (3) so that the two preceding upper connecting rods (3) to middle jackknife action, or to support expansion and locking the two preceding upper connecting rods (3)。

7. Pushchair according to claim 6, it is characterised in that：Described to middle loosing and tightening structure (6) includes hinged The first transverse connecting rod (61) between the two preceding upper connecting rods (3) and the second transverse connecting rod (62), described first laterally connects Bar (61) inner end is hinged with the second transverse link (62) inner end and on the upside of second transverse link (62)；

The first of downward indent is offered on the upside of first transverse link (61) inner end to lower groove (611), and under its inner end Side offers the upward groove (612) of upward indent, and downwardly convex downward pillar is equipped in the middle part of the upward groove (612) (613), and its inside is equipped with towards first raised (614) of downward pillar (613) the direction protrusion, first protrusion (614) quantity is at least 2, and offered between adjacent described first raised (614) up and down through be connected to described first to The through hole up and down (615) of lower groove (611) and the upward groove (612)；

The second of downward indent is offered on the upside of second transverse link (62) inner end to lower groove (621), described second to It is equipped in the middle part of lower groove (621) and raises up and the upward pillar (622) coaxial with the downward pillar (613), and on the inside of it Equipped with towards second raised (623) of upward pillar (622) the direction protrusion, the quantity of described second raised (623) with it is described First raised (614) are equal；

It is described to further include to middle loosing and tightening structure (6)：

Elastic yoke frame (63) is sheathed on the upward pillar (622)；

Clamping lock locating piece (64) is sheathed between the downward pillar (613) and the upward pillar (622), is located at by institute It states upward groove (612) and described second and is formed by accommodation space to lower groove (621), and positioned at the elastic yoke frame (63) top, and offer thereon and can be adapted and be fastened with clamping lock with described first raised (614) and second raised (623) The clamping lock notch (641) of first transverse link (61) and second transverse link (62)；

Unblock button (65) is sheathed on described first into lower groove (611), and its lower end extends through the through hole up and down (615) and in the upward groove (612) it, is pushed away the clamping lock locating piece (64) with following and is forced the elastic yoke frame (63) retracted downward is then described so that the clamping lock locating piece (64) is moved downward to described second in lower groove (621) Clamping lock notch (641) is detached from described first raised (614), to loosen first transverse link (61) and described second laterally Connecting rod (62).

8. Pushchair according to claim 7, it is characterised in that：Unblock button (65) lower end is equipped with outside Extend and extension limiting section (651) that quantity is equal with upper and lower through hole (615) quantity, the extension limiting section (651) Radial dimension is more than the radial dimension of the through hole (615) up and down.

9. Pushchair according to claim 1, it is characterised in that：The Pushchair further includes being set to institute It states on the inside of preceding lower link (2) and the support articulated joints (81) and to support the Seat support holder of baby seat (10)。