CN214451248U - Joint structure, frame and cart - Google Patents

Abstract

The utility model provides a joint structure, a frame and a cart, relating to the technical field of carts, wherein the joint structure comprises a first connecting piece, a second connecting piece and a third connecting piece; the first connecting piece and the second connecting piece are rotationally connected through a first rotating shaft, and the third connecting piece and the second connecting piece are rotationally connected through a second rotating shaft; the first connecting piece is provided with a sliding piece, and the sliding piece is connected with the second connecting piece in a sliding manner along the circumferential direction of the first rotating shaft; the second connecting piece is connected with the sliding piece in a sliding manner along the moving direction of the sliding piece relative to the second rotating shaft when the second connecting piece and the third connecting piece rotate relatively; any two of the first connecting piece, the second connecting piece and the third connecting piece are detachably connected with a locking structure. The utility model discloses the frame of having alleviated among the prior art in the shallow adopts external link mechanism to realize the expansion of frame or the action that receipts were closed, however external link mechanism can make the more complicated technical problem of overall structure of frame.

Description

Joint structure, frame and cart

Technical Field

The utility model belongs to the technical field of the shallow technique and specifically relates to a joint structure, frame and shallow.

Background

The existing stroller is usually foldable, and for folding the stroller, a frame in the stroller is mostly unfolded or folded by using an external link mechanism (usually including 2 to 4 external links).

For example, patent No. CN207257741U discloses a stroller frame, which includes a front leg rod, a rear leg rod, a handle rod, a sliding member, and a folding mechanism. The rear foot rod is respectively connected with the front foot rod and the handle rod in a rotating mode, the sliding piece is connected to the handle rod in a sliding mode, the folding mechanism is connected with the sliding piece in a rotating mode, and the folding mechanism is used for driving the front foot rod and the handle rod to respectively draw close to the rear foot rod when the sliding piece slides on the handle rod, so that the frame can be folded. The folding mechanism comprises a connecting rod and a driving rod, the driving rod is rotatably connected between the sliding piece and the rear foot rod, and the connecting rod is rotatably connected between the driving rod and the front foot rod. When the sliding part slides on the handle rod, the driving rod can be driven to rotate, and then the connecting rod connected with the driving rod can be driven to rotate, and the front foot rod can be driven to be drawn close to the rear foot rod after the connecting rod rotates, so that the folding of the frame is realized.

The folding mechanism in the frame of the stroller is an external link mechanism, however, the external link mechanism can make the overall structure of the frame more complicated, and further increase the weight of the frame, resulting in inconvenient carrying of the stroller.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a joint structure, frame and shallow to the frame that the children's shallow that exists among the alleviating prior art adopts external link mechanism to realize the expansion of frame or the action of closing for the most, however external link mechanism can make the overall structure of frame more complicated, and then can increase the weight of frame, leads to the technical problem that the shallow is not convenient for carry.

The joint structure provided by the utility model comprises a first connecting piece, a second connecting piece and a third connecting piece which are correspondingly connected with the end part of the handle rod, the end part of the rear foot rod and the end part of the front foot rod of the frame;

the first connecting piece and the second connecting piece are rotationally connected through a first rotating shaft, and the third connecting piece and the second connecting piece are rotationally connected through a second rotating shaft;

the first connecting piece is provided with a sliding piece, and the sliding piece is connected with the second connecting piece in a sliding manner along the circumferential direction of the first rotating shaft; the second connecting piece is connected with the sliding piece in a sliding mode along the direction in which the sliding piece moves relative to the second rotating shaft when the second connecting piece and the third connecting piece rotate relatively;

any two of the first connecting piece, the second connecting piece and the third connecting piece are detachably connected with a locking structure, and the locking structure is used for limiting the relative rotation between the first connecting piece and the third connecting piece.

Further, the locking structure comprises a locking member;

the locking piece is positioned on one side of the second connecting piece and is movably connected with the first connecting piece, a clamping protrusion is arranged on one side of the locking piece close to the second connecting piece, and a clamping groove corresponding to the clamping protrusion is arranged on the second connecting piece;

the locking piece can move on the first connecting piece, so that the clamping protrusion extends into the clamping groove or is separated from the clamping groove;

the joint is protruding to be used for when it stretches into in the draw-in groove, follow first connecting piece with relative pivoted direction between the second connecting piece with the mutual butt of draw-in groove.

Further, the locking structure further comprises a pull wire and an elastic piece;

the pull wire is connected with the locking piece and used for driving the locking piece to move on the first connecting piece so as to enable the clamping protrusion to be separated from the clamping groove;

the elastic piece is connected between the locking piece and the first connecting piece and used for storing energy when the pull wire pulls the locking piece to move and releasing energy when the pull wire releases the locking piece.

Further, the locking piece is rotatably connected to the first connecting piece through a third rotating shaft parallel to the first rotating shaft;

the joint protruding with the lateral wall that can butt each other between the draw-in groove is the inclined plane.

Furthermore, the first connecting piece, the second connecting piece and the third connecting piece are all in a sheet shape, and the second connecting piece is attached between the first connecting piece and the third connecting piece.

Furthermore, a first slide way extending along the circumferential direction of the first rotating shaft is arranged on the second connecting piece between the first rotating shaft and the second rotating shaft;

a second slide way is arranged on one side, close to the first slide way, of the second rotating shaft of the third connecting piece, and when the second slide way rotates along the second connecting piece and the third connecting piece relatively, the moving track of the sliding piece relative to the second rotating shaft extends;

the sliding piece is fixed on the first connecting piece and is connected in the first slide way and the second slide way in a sliding mode.

Furthermore, the joint structure further comprises a housing, and the first connecting piece, the second connecting piece and the third connecting piece are all installed inside the housing.

Further, the outer shell and the first connecting piece are connected through a fastener;

the first connecting piece is provided with a third slide way extending along the circumferential direction of the first rotating shaft, and the fastener is connected in the third slide way in a sliding manner and can slide relative to the third slide way when the first connecting piece rotates relative to the second connecting piece.

The utility model provides a frame includes any one of above-mentioned technical scheme joint structure.

The utility model provides a shallow includes any one of above-mentioned technical scheme joint structure or above-mentioned frame.

The utility model provides a joint structure, frame and shallow can produce following beneficial effect:

the utility model provides a joint structure is including being used for the first connecting piece, second connecting piece and the third connecting piece of being connected with the tip of the handle pole of frame, the tip of back foot pole and the tip one-to-one of preceding foot pole. Because the first connecting piece, the second connecting piece and the third connecting piece are all connected with the sliding piece, the relative rotation process among the first connecting piece, the second connecting piece and the third connecting piece in the joint structure is also limited by the position of the sliding piece. When the locking structure locks any two of the first connecting piece, the second connecting piece and the third connecting piece to limit the relative rotation of the first connecting piece, the second connecting piece and the third connecting piece, the sliding piece is in a fixed state and can be matched with the first rotating shaft or the second rotating shaft to limit the rotation of the other one of the first connecting piece, the second connecting piece and the third connecting piece, and then the whole joint structure can be locked. On the contrary, when the locking structure is in the unlocking state, the sliding part is not limited and can move, any two of the first connecting piece, the second connecting piece and the third connecting piece in the joint structure can rotate relatively, and the whole joint structure is in the unlocking state. Therefore, the locking structure is detachably connected with any two of the first connecting piece, the second connecting piece and the third connecting piece, and the whole joint structure can be locked or unlocked. When the frame of the trolley needs to be folded, the locking structure is firstly in an unlocking state, and then the first connecting piece is pressed downwards to rotate, so that the first connecting piece rotates along the direction of the circumferential direction of the first rotating shaft close to the second connecting piece, and the first connecting piece can drive the sliding piece to slide relative to the second connecting piece along the circumferential direction of the first rotating shaft. Meanwhile, the third connecting piece can rotate towards the direction close to the second connecting piece along the circumferential direction of the second rotating shaft, and the sliding piece is connected with the sliding piece in a sliding mode along the moving direction of the sliding piece relative to the second rotating shaft when the second connecting piece and the third connecting piece rotate relatively, so that the sliding piece has the freedom degree of moving relative to the second rotating shaft on the third connecting piece, and the sliding piece cannot block the rotating process of the third connecting piece relative to the second connecting piece. After the first connecting piece and the third connecting piece are both rotated to the second connecting piece, the joint structure and the frame connected with the joint structure are both in a folded state. Correspondingly, the first connecting piece and the third connecting piece are rotated reversely, the position of the first connecting piece connected with the handle rod, the position of the second connecting piece connected with the rear foot rod and the position of the third connecting piece connected with the front foot rod are distributed in a triangular mode, and the first connecting piece, the second connecting piece and the third connecting piece are locked by the locking structure, so that the joint structure and the frame connected with the joint structure are in the unfolding state.

Compared with the prior art, the utility model provides a joint structure can replace the external link mechanism on the current frame to drive the frame and fold and expand, because first connecting piece, second connecting piece and the third connecting piece among this joint structure are connected between the tip of handle pole, the tip of back foot pole and the tip of preceding foot pole, and do not need externally on handle pole, back foot pole and preceding foot pole, therefore the utility model provides a joint structure's overall dimension and volume are all less, can promote the simple degree of cleanliness of frame outward appearance to and reduce the material consumption and use, reduce the weight of frame, promote shallow's portability.

The utility model provides a frame includes above-mentioned joint structure, therefore the utility model provides a frame has the same beneficial effect with above-mentioned joint structure.

The utility model provides a shallow includes above-mentioned joint structure or above-mentioned frame, therefore the utility model provides a shallow has the same beneficial effect with above-mentioned joint structure or above-mentioned frame.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a frame and a joint structure of a cart according to an embodiment of the present invention;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is a rear elevational view of the joint structure of FIG. 1;

fig. 4 is a schematic structural view of a locking mechanism in a joint structure according to an embodiment of the present invention in an unlocked state;

fig. 5 is a schematic structural view of a joint structure provided in an embodiment of the present invention during a folding process;

fig. 6 is another schematic structural diagram of the joint structure provided by the embodiment of the present invention in the folding process;

fig. 7 is a schematic structural view of a joint structure provided in an embodiment of the present invention in a folded state;

fig. 8 is a schematic structural diagram of a first connecting element in a joint structure according to an embodiment of the present invention;

fig. 9 is a schematic structural view of a second connecting member in the joint structure according to the embodiment of the present invention;

fig. 10 is a schematic structural view of a third connecting member in the joint structure according to the embodiment of the present invention;

fig. 11 is a schematic structural view of a housing in a frame and joint structure of a cart according to an embodiment of the present invention;

FIG. 12 is a schematic structural view of the housing of FIG. 11;

fig. 13 is a schematic structural diagram of a cart according to an embodiment of the present invention.

Icon: 1-handle bar; 2-rear foot bar; 3-front foot bar; 4-a first connector; 40-a slide; 41-a third rotating shaft; 42-a third slide; 5-a second connector; 50-a first rotating shaft; 51-a second shaft; 52-card slot; 53-a first slide; 6-a third connector; 60-a second slide; 7-a locking structure; 70-a locking member; 700-clamping a projection; 71-a pull line; 72-a resilient member; 8-a housing; 80-fasteners.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Example (b):

as shown in fig. 1 to 3, the joint structure provided in this embodiment includes a first connector 4, a second connector 5, and a third connector 6 for one-to-one connection with the end of the handlebar 1, the end of the rear foot bar 2, and the end of the front foot bar 3 of the vehicle frame. The first connecting piece 4 and the second connecting piece 5 are rotatably connected through a first rotating shaft 50, and the third connecting piece 6 and the second connecting piece 5 are rotatably connected through a second rotating shaft 51. The first connecting piece 4 is provided with a sliding piece 40, and the sliding piece 40 is connected with the second connecting piece 5 in a sliding way along the circumferential direction of the first rotating shaft 50; the second link 5 is slidably connected to the slider 40 in a direction in which the slider 40 moves relative to the second rotating shaft 51 when the second link 5 and the third link 6 relatively rotate. Any two of the first connecting piece 4, the second connecting piece 5 and the third connecting piece 6 are detachably connected with a locking structure 7, and the locking structure 7 is used for limiting the relative rotation between the two connected with the locking structure 7.

It should be noted that, as shown in fig. 2 and 3, since the first connecting element 4, the second connecting element 5 and the third connecting element 6 are all connected with the sliding element 40, the relative rotation process between the first connecting element 4, the second connecting element 5 and the third connecting element 6 in the joint structure is also limited by the position of the sliding element 40. When the locking structure 7 locks any two of the first connecting piece 4, the second connecting piece 5 and the third connecting piece 6 and the two rotate relatively, the sliding piece 40 is in a fixed state and can be matched with the first rotating shaft 50 or the second rotating shaft 51 to limit the rotation of the other one of the three, so that the whole joint structure can be locked. On the contrary, when the locking structure 7 is in the unlocked state, the sliding member 40 is no longer restricted and can move, and any two of the first connecting member 4, the second connecting member 5 and the third connecting member 6 in the joint structure can relatively rotate at the moment, so that the whole joint structure is in the unlocked state.

Therefore, the locking structure 7 is detachably connected with any two of the first connecting piece 4, the second connecting piece 5 and the third connecting piece 6, and the whole joint structure can be locked or unlocked.

When the frame of the stroller needs to be folded, as shown in fig. 4, the locking structure 7 is first unlocked, and then the first connecting member 4 is pressed downward and rotated, as shown in fig. 5 and 6, so that the first connecting member 4 rotates along the circumferential direction of the first rotating shaft 50 toward the direction close to the second connecting member 5, and at this time, the first connecting member 4 drives the sliding member 40 to slide relative to the second connecting member 5 along the circumferential direction of the first rotating shaft 50. Meanwhile, the third connecting piece 6 can be rotated along the circumferential direction of the second rotating shaft 51 towards the direction close to the second connecting piece 5, and because the second connecting piece 5 is connected with the sliding piece 40 in a sliding way along the direction of the sliding piece 40 moving relative to the second rotating shaft 51 when the second connecting piece 5 and the third connecting piece 6 rotate relatively, the sliding piece 40 has the freedom degree of moving relative to the second rotating shaft 51 on the third connecting piece 6, and the sliding piece 40 does not obstruct the rotating process of the third connecting piece 6 relative to the second connecting piece 5. After the first connecting piece 4 and the third connecting piece 6 are both rotated to the second connecting piece 5, as shown in fig. 7, the joint structure and the vehicle frame connected with the joint structure are both in a folded state.

Correspondingly, the first connecting piece 4 and the third connecting piece 6 are rotated reversely, the position of the first connecting piece 4 connected with the handle rod 1, the position of the second connecting piece 5 connected with the rear foot rod 2 and the position of the third connecting piece 6 connected with the front foot rod 3 are distributed in a triangular shape, as shown in fig. 3, and the joint structure and the frame connected with the joint structure can be unfolded by locking the first connecting piece 4, the second connecting piece 5 and the third connecting piece 6 by the locking structure 7.

It should be noted that the first rotating shaft 50 and the second rotating shaft 51 may be parallel to each other, and the circumferential direction of the first rotating shaft 50 is the same as the circumferential direction of the second rotating shaft 51. Because the second connecting member 5 is slidably connected to the sliding member along the direction in which the sliding member 40 moves relative to the second rotating shaft 51 when the second connecting member 5 and the third connecting member 6 rotate relative to each other, an interaction force exists between the sliding member 40 and the third connecting member 6 along the circumferential direction of the first rotating shaft 50, and when the sliding member 40 is driven by the first connecting member 4 to move along the circumferential direction of the first rotating shaft 50, the sliding member 40 can also drive the third connecting member 6 to rotate along the circumferential direction of the first rotating shaft 50 (the second rotating shaft 51), so that the relative rotation process of the third connecting member 6 relative to the second connecting member 5 can be realized without applying a force to the third connecting member 6.

It can be seen that the first connecting piece 4 and the third connecting piece 6 in the joint structure provided by the embodiment can be linked, so that the operation steps of the joint structure can be simplified, and the use convenience is improved.

Compared with the prior art, the joint structure provided by the embodiment can replace an external connecting rod mechanism on the existing frame to drive the frame to fold and unfold, and the first connecting piece 4, the second connecting piece 5 and the third connecting piece 6 in the joint structure are connected between the end part of the handle rod 1, the end part of the rear foot rod 2 and the end part of the front foot rod 3, and do not need to be externally arranged on the handle rod 1, the rear foot rod 2 and the front foot rod 3, so that the whole size and the volume of the joint structure provided by the embodiment are smaller, the appearance simplicity and cleanliness of the frame can be improved, the material consumption is reduced, the weight of the frame is reduced, and the portability of the cart is improved.

It can be seen that the joint structure that this embodiment provided has alleviated the action that the frame among the children's shallow that exists among the prior art mostly adopts external link mechanism to realize the expansion of frame or receive, however external link mechanism can make the overall structure of frame more complicated, and then can increase the weight of frame, leads to the technical problem that the shallow is not convenient for carry.

As previously mentioned, the locking structure 7 may be mounted between any two of the first connector 4, the second connector 5 and the third connector 6.

In this embodiment, it is preferable that the locking structure 7 is installed between the first connecting member 4 and the second connecting member 5, specifically, as shown in fig. 2, the locking structure 7 includes a locking member 70, the locking member 70 is located on one side of the second connecting member 5 and movably connected to the first connecting member 4, a clamping protrusion 700 is disposed on one side of the locking member 70 close to the second connecting member 5, and a clamping groove 52 corresponding to the clamping protrusion 700 is disposed on the second connecting member 5. The locking member 70 can be moved on the first connector 4 to extend the catching projection 700 into the catching groove 52 or disengage from the catching groove 52. The engaging protrusion 700 is adapted to abut against the engaging groove 52 in a direction of relative rotation between the first connector 4 and the second connector 5 when the engaging protrusion extends into the engaging groove 52.

Because the clamping protrusion 700 is used for abutting against the clamping groove 52 along the direction of relative rotation between the first connecting piece 4 and the second connecting piece 5 when the clamping protrusion 700 extends into the clamping groove 52, the first connecting piece 4 and the second connecting piece 5 cannot rotate relatively, the sliding piece 40 and the first rotating shaft 50 both keep a fixed state, and the second rotating shaft 51 and the third connecting piece 6 cannot rotate under the limitation of the sliding piece 40, so that the whole joint structure can be locked.

Wherein, the movable connection can be a sliding connection or a rotating connection.

In order to facilitate the driving of the engaging protrusion 700 to extend into the engaging groove 52 or disengage from the engaging groove 52, the locking member 70 may be connected to a driving member such as a pulling cable or a pulling rod that can be exposed outside the frame. In order to stably locate the clamping protrusion 700 extending into the clamping groove 52 in the clamping groove 52, fixing members such as a pin shaft and a screw are detachably connected between the driving member and the frame, or between the locking member 70 and the other members.

In order to facilitate the driving of the clamping protrusion 700 to extend into the clamping groove 52 or disengage from the clamping groove 52, and to enable the clamping protrusion 700 extending into the clamping groove 52 to be stably located in the clamping groove 52, the preferred locking structure 7 of this embodiment further includes a pulling wire 71 and an elastic member 72. As shown in fig. 2 and 3, the pulling wire 71 is connected to the locking member 70 for moving the locking member 70 on the first connecting member 4 to disengage the catching protrusion 700 from the catching groove 52. The elastic member 72 is connected between the locking member 70 and the first connecting member 4 for accumulating energy when the wire 71 pulls the locking member 70 to move, and releasing energy when the wire 71 releases the locking member 70.

When the pull wire 71 is pulled so that the pull wire 71 pulls the locking member 70 to move, the clamping protrusion 700 is disengaged from the clamping groove 52, and the elastic member 72 is compressed and is in a process of energy storage. When the pull wire 71 is released to release the locking member 70 from the pull wire 71, the elastic member 72 is in the energy release process and drives the locking member 70 to return to the original position, and the clamping protrusion 700 extends into the clamping groove 52.

It can be seen that the pulling wire 71 serves to facilitate control of the unlocking process of the locking mechanism 7, and the elastic member 72 serves to facilitate control of the locking process of the locking mechanism 7.

In practice, the elastic member 72 may be a torsion spring. Further, in order to make full use of the space, the elastic member 72 and the locking member 70 may be installed at both sides of the first connecting member 4, respectively, and one end of the elastic member 72 penetrates the first connecting member 4 to be connected to the locking member 70.

In practical applications, the locking member 70 may be slidably connected to the first connecting member 4 or rotatably connected to the first connecting member 4. As shown in fig. 2, in the present embodiment, the locking member 70 is preferably rotatably connected to the first connecting member 4 by a third rotating shaft 41 parallel to the first rotating shaft 50, and the side walls of the clamping protrusion 700 and the clamping groove 52 that can abut against each other are inclined surfaces.

When the locking member 70 is rotatably connected to the first connecting member 4 through the third rotating shaft 41 parallel to the first rotating shaft 50, the side walls of the clamping protrusion 700 and the clamping groove 52 which can be abutted against each other are inclined planes, so that the smoothness of the clamping protrusion 700 extending into the clamping groove 52 and the smoothness of the clamping protrusion 700 separating from the clamping groove 52 can be improved.

For further improving the smoothness of the clamping protrusion 700 extending into the clamping groove 52 and the smoothness of the clamping protrusion 700 separating from the clamping groove 52, the side walls of the clamping protrusion 700 and the clamping groove 52 which can be mutually abutted can be inclined planes with certain radian.

It should be noted that, when the locking member 70 is rotatably connected to the first connecting member 4 through the third rotating shaft 41 parallel to the first rotating shaft 50, and the side walls of the clamping protrusion 700 and the clamping groove 52 that can abut against each other are all inclined surfaces, it can be limited that the sliding member 40 has a certain sliding stroke, and the locking member 70 is mutually matched with the sliding member 40 in a position fixing relationship when the sliding member 40 slides to the start point and the end point of the sliding stroke, so that the relative fixing relationship between the first connecting member 4 and the second connecting member 5 is kept stable when the joint structure is in the unfolded state.

As shown in fig. 7, 8, 9 and 10, the first connecting member 4, the second connecting member 5 and the third connecting member 6 are all in a sheet shape, and the second connecting member 5 is attached between the first connecting member 4 and the third connecting member 6.

In practical application, the first connecting piece 4, the second connecting piece 5 and the third connecting piece 6 which are sheet-shaped can be made of hardware hinge sheets.

First connecting piece 4, second connecting piece 5 and third connecting piece 6 are the slice, and the consumptive material that can further save simplifies the structure of joint structure, promotes the outward appearance succinct nature of shallow, and first connecting piece 4, second connecting piece 5 and third connecting piece 6 are the slice, can also guarantee the smooth nature of the relative rotation process between first connecting piece 4, second connecting piece 5 and the third connecting piece 6.

Further, the first sheet-shaped connector 4 and the handle bar 1 may be integrally formed or fixed together by welding, screwing, or the like, the second sheet-shaped connector 5 and the rear leg bar 2 may be integrally formed or fixed together by welding, screwing, or the like, and the third sheet-shaped connector 6 and the front leg bar 3 may be integrally formed or fixed together by welding, screwing, or the like.

As shown in fig. 9, a first slide 53 extending in the circumferential direction of the first rotating shaft 50 is provided on the second link 5 at a position between the first rotating shaft 50 and the second rotating shaft 51. As shown in fig. 10, a second slide way 60 is disposed on a side of the third link 6, which is located on the second rotating shaft 51 and close to the first slide way 53, and when the second slide way 60 rotates along the second link 5 and the third link 6, the moving track of the sliding member 40 relative to the second rotating shaft 51 extends. The slider 40 is fixed to the first link 4 and is slidably connected in the first and second runners 53, 60.

The first sliding way 53 may be a through hole penetrating both sides of the second connecting member 5, and the second sliding way 60 may be a through hole penetrating both sides of the third connecting member 6, in which case the second sliding way 60 is located at one side of the first sliding way 53, and the sliding member 40 sequentially penetrates the first sliding way 53 and the second sliding way 60 to be slidably connected in the first sliding way 53 and the second sliding way 60.

The first sliding way 53 may have a certain arc length, so that the first sliding way 53 can limit the sliding stroke of the sliding member 40, and thus when the joint structure is in the unfolded state, the end of the first sliding way 53 away from the back foot bar 2 is in abutting relation with the sliding member 40, and the first sliding way 53 and the locking structure 7 cooperate with each other to improve the stability of the relatively fixed state between the first connecting member 4 and the second connecting member 5.

When the second sliding path 60 rotates along the second connecting member 5 and the third connecting member 6, and the moving track of the sliding member 40 relative to the second rotating shaft 51 extends, the second sliding path 60 is in a straight line shape. The second slideway 60 is used for providing freedom for the movement process of the sliding member 40 on the third connecting member 6 relative to the second rotating shaft 51 during the relative rotation of the third connecting member 6 and the second connecting member 5, and preventing the third connecting member 6 from influencing the movement process of the sliding member 40.

As shown in fig. 11 and 12, the joint structure provided by this embodiment further includes a housing 8, and the first connecting member 4, the second connecting member 5, and the third connecting member 6 are all installed inside the housing 8.

The housing 8 is used for protecting the first connecting piece 4, the second connecting piece 5 and the third connecting piece 6, and can improve the appearance simplicity and the aesthetic property of the joint structure.

As shown in fig. 12, the housing 8 and the first connecting member 4 are connected by a fastener 80. As shown in fig. 8, the first connecting member 4 is provided with a third slideway 42 extending along the circumferential direction of the first rotating shaft 50, and the fastening member 80 is slidably connected in the third slideway 42 and can slide relative to the third slideway 42 when the first connecting member 4 rotates relative to the second connecting member 5.

The fastener 80 may be a screw, a rivet, or the like, and the fastener 80 is used to improve the installation stability of the first connecting member 4 in the housing 8. And the third slideway 42 can raise the degree of freedom of the fastener 80 during the rotation of the first connector 4 relative to the second connector 5, and prevent the fastener 80 from influencing the relative rotation process between the first connector 4 and the second connector 5.

Further, the second rotating shaft 51 may be formed by screws, rivets, or the like, and the second rotating shaft 51 may be connected to the housing 8, so as to improve the installation stability of the third connecting member 6 in the housing 8.

In this embodiment, the housing 8 may be formed by mating two half-shells between which the first connector 4, the second connector 5 and the third connector 6 are mounted. Further, the two half shells can be fixedly connected through connecting pieces such as screws and rivets.

In summary, the operation steps of the joint structure provided by this embodiment are as follows:

when the joint structure needs to be folded, the locking state of the locking structure 7 is firstly released, then the handle bar 1 and the first connecting piece 4 are pressed downwards, at the moment, the sliding piece 40 on the first connecting piece 4 slides along the first slideway 53 and drives the third connecting piece 6 to slide in the second slideway 60, and the first connecting piece 4 and the third connecting piece 6 are both closed to the second connecting piece 5, and finally the folding process can be completed. When the joint structure needs to be unfolded, the steps are operated in the reverse direction.

As shown in fig. 11, the present embodiment further provides a frame, which includes the joint structure, so that the frame and the joint structure provided in the present embodiment can solve the same technical problem and achieve the same technical effect, and are not described herein again.

As shown in fig. 13, the present embodiment further provides a cart, which includes the joint structure or the frame, so that the cart provided in the present embodiment and the joint structure or the frame can solve the same technical problems and achieve the same technical effects, and further description is omitted herein.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (10)

1. The joint structure is characterized by comprising a first connecting piece (4), a second connecting piece (5) and a third connecting piece (6), wherein the first connecting piece, the second connecting piece and the third connecting piece are used for being in one-to-one correspondence connection with the end part of a handle rod (1), the end part of a rear foot rod (2) and the end part of a front foot rod (3) of a frame;

the first connecting piece (4) is rotationally connected with the second connecting piece (5) through a first rotating shaft (50), and the third connecting piece (6) is rotationally connected with the second connecting piece (5) through a second rotating shaft (51);

the first connecting piece (4) is provided with a sliding piece (40), and the sliding piece (40) is connected with the second connecting piece (5) in a sliding manner along the circumferential direction of the first rotating shaft (50); the second connecting piece (5) is connected with the sliding piece (40) in a sliding way along the direction that the sliding piece (40) moves relative to the second rotating shaft (51) when the second connecting piece (5) and the third connecting piece (6) rotate relatively;

any two of the first connecting piece (4), the second connecting piece (5) and the third connecting piece (6) are detachably connected with a locking structure (7), and the locking structure (7) is used for limiting the relative rotation between the two connected with the locking structure.

2. Joint construction according to claim 1, characterised in that the locking construction (7) comprises a locking member (70);

the locking piece (70) is positioned on one side of the second connecting piece (5) and movably connected with the first connecting piece (4), a clamping protrusion (700) is arranged on one side, close to the second connecting piece (5), of the locking piece (70), and a clamping groove (52) corresponding to the clamping protrusion (700) is arranged on the second connecting piece (5);

the locking piece (70) can move on the first connecting piece (4) so that the clamping protrusion (700) extends into the clamping groove (52) or is separated from the clamping groove (52);

the clamping protrusion (700) is used for abutting against the clamping groove (52) in the direction of relative rotation between the first connecting piece (4) and the second connecting piece (5) when the clamping protrusion extends into the clamping groove (52).

3. The joint structure according to claim 2, wherein the locking structure (7) further comprises a pulling wire (71) and an elastic member (72);

the pull wire (71) is connected with the locking piece (70) and used for driving the locking piece (70) to move on the first connecting piece (4) so as to enable the clamping protrusion (700) to be separated from the clamping groove (52);

the elastic piece (72) is connected between the locking piece (70) and the first connecting piece (4) and used for storing energy when the pull wire (71) pulls the locking piece (70) to move and releasing energy when the pull wire (71) releases the locking piece (70).

4. Joint construction according to claim 3, characterised in that the locking member (70) is rotatably connected to the first connecting member (4) by means of a third rotation axis (41) parallel to the first rotation axis (50);

the clamping protrusions (700) and the side walls capable of being mutually abutted between the clamping grooves (52) are inclined planes.

5. Joint construction according to any one of claims 1-4, characterised in that said first (4), second (5) and third (6) connecting elements are each in the form of a sheet, and in that said second connecting element (5) is fitted between said first (4) and third (6) connecting elements.

6. The joint structure according to claim 5, wherein a first slide (53) extending in a circumferential direction of the first rotating shaft (50) is provided on the second connecting member (5) at a position between the first rotating shaft (50) and the second rotating shaft (51);

a second slideway (60) is arranged on one side, close to the first slideway (53), of the third connecting piece (6) and positioned on the second rotating shaft (51), and when the second slideway (60) rotates along the second connecting piece (5) and the third connecting piece (6) relatively, the moving track of the sliding piece (40) relative to the second rotating shaft (51) extends;

the sliding part (40) is fixed on the first connecting part (4) and is connected in the first slideway (53) and the second slideway (60) in a sliding manner.

7. The joint structure according to claim 1, characterized in that it further comprises a housing (8), said first (4), second (5) and third (6) connection elements being mounted inside said housing (8).

8. Joint construction according to claim 7, characterised in that the housing (8) and the first connector (4) are connected by means of a fastener (80);

the first connecting piece (4) is provided with a third slide way (42) extending along the circumferential direction of the first rotating shaft (50), and the fastener (80) is connected in the third slide way (42) in a sliding manner and can slide relative to the third slide way (42) when the first connecting piece (4) rotates relative to the second connecting piece (5).

9. A vehicle frame, characterized in that it comprises a joint construction according to any one of claims 1-8.

10. A cart, characterized in that it comprises a joint construction according to any of claims 1-8 or a frame according to claim 9.

Images