CN220701180U - Frame and baby carrier comprising same - Google Patents

Abstract

The utility model discloses a frame and a baby carrier with the frame, wherein the frame comprises a wheel frame, a front universal wheel, a rear universal wheel, a front wheel positioning mechanism, a rear wheel positioning mechanism, a handle frame and a reversing control mechanism. The front universal wheel is arranged on the wheel frame, the rear universal wheel is arranged on the wheel frame, the front wheel positioning mechanism is arranged on the wheel frame and can position the front universal wheel, the rear wheel positioning mechanism is arranged on the wheel frame and can position the rear universal wheel, and the handle frame is rotatably arranged on the wheel frame and can switch the front side position and the rear side position. The reversing control mechanism comprises a control piece, a driving piece, a front linkage piece and a rear linkage piece, wherein the control piece is movably arranged on the wheel frame and provided with a front wheel positioning position and a rear wheel positioning position; the driving piece is arranged on the handle frame, and when the handle frame rotates to switch positions, the driving piece can drive the control piece to switch the front wheel positioning position and the rear wheel positioning position. The frame and the baby carrier comprising the same are simple in structure.

Description

Frame and baby carrier comprising same

Technical Field

The utility model relates to articles for daily use, in particular to a frame and a baby carrier comprising the same.

Background

The front wheels and the rear wheels of the existing baby carrier frames are all universal wheel structures, the front and rear positions of the handle frames can be switched, and the traveling direction of one of the front wheels and the rear wheels is positioned and the other one of the front wheels and the rear wheels is kept to rotate in a universal mode through a reversing control mechanism when the handle frames are switched in position, so that the use direction of the baby carrier can be switched. The existing baby carrier of the type comprises a trigger piece and a spring, wherein the trigger piece and the spring correspond to a front wheel and a rear wheel respectively, the two trigger pieces are respectively and independently connected with a positioning mechanism of the front wheel and the rear wheel through a linkage piece, and the spring is used for providing reset force. When the handle frame rotates, one trigger piece is touched to release the other trigger piece, the touched trigger piece positions the advancing direction of the universal wheel through the corresponding positioning mechanism in a linkage mode, and the other trigger piece keeps the position through the spring, so that the other universal wheel cannot be positioned to keep universal rotation. The frame of the baby carrier is required to be provided with two groups of triggering pieces and springs, and is more in number of parts, more complex in structure and troublesome to assemble.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides the vehicle frame, and the reversing control mechanism is simple in structure.

The utility model also provides a baby carrier with the frame.

A frame according to an embodiment of the first aspect of the utility model comprises: a wheel carrier; the front universal wheel is arranged on the wheel frame; the rear universal wheel is arranged on the wheel frame; the front wheel positioning mechanism is arranged on the wheel frame and can position the front universal wheel to move forwards and backwards; the rear wheel positioning mechanism is arranged on the wheel frame and can position the rear universal wheel to move forwards and backwards; the handle frame is rotatably arranged on the wheel frame and can switch a front side position and a rear side position, and the handle frame corresponds to the rear universal wheel up and down in the rear side position; the handle frame corresponds to the front universal wheel in the front side position; the reversing control mechanism comprises a control piece, a driving piece, a front linkage piece and a rear linkage piece, wherein the control piece is movably arranged on the wheel frame and is provided with a front wheel positioning position and a rear wheel positioning position, and the control piece is respectively connected with the front wheel positioning mechanism and the rear wheel positioning mechanism through the front linkage piece and the rear linkage piece; in the front wheel positioning position, the control piece enables the front wheel positioning mechanism to position the advancing direction of the front universal wheel through the front linkage piece, and enables the rear wheel positioning mechanism not to position the advancing direction of the rear universal wheel through the rear linkage piece; in the rear wheel positioning position, the control member enables the rear wheel positioning mechanism to position the advancing direction of the rear universal wheel through the rear linkage member, and enables the front wheel positioning mechanism not to position the advancing direction of the front universal wheel through the front linkage member; the driving piece is arranged on the handle frame, and when the handle frame rotates to a switching position, the driving piece can drive the control piece to switch the front wheel positioning position and the rear wheel positioning position.

The frame provided by the embodiment of the utility model has at least the following beneficial effects: when the frame is used in reversing, the handle frame is rotated to be positioned at the front side position or the rear side position, when the handle frame rotates, the control piece can be driven by the driving piece to switch the position, and the control piece controls the positioning states of the front wheel positioning mechanism and the rear wheel positioning mechanism through the front linkage piece and the rear linkage piece, so that one of the front universal wheel and the rear universal wheel keeps universal running and the other one of the front universal wheel and the rear universal wheel changes into directional running, and the reversing function of the frame is completed. According to the frame, the front wheel positioning mechanism and the rear wheel positioning mechanism are controlled through the position change of the single control piece, so that the number of parts is reduced, the structure is simplified, and the product assembly is convenient.

According to some embodiments of the utility model, the wheel frame is provided with a wheel frame joint, the wheel frame joint is provided with a limiting accommodating cavity, the control piece is movably arranged in the limiting accommodating cavity, the handle frame is provided with a handle joint, the handle joint is hinged to the wheel frame joint, the control piece is an annular body, the driving piece is an eccentric block arranged on the handle joint, and the driving piece is inserted into an inner hole of the control piece.

According to some embodiments of the utility model, the inner side wall of the limit accommodating cavity is an arc surface, the control piece is a circular ring, the diameter of the control piece is smaller than that of the limit accommodating cavity, one end of the driving piece is provided with the arc surface, and the driving piece is matched with the inner hole wall of the control piece through the arc surface at one end of the driving piece.

According to some embodiments of the present utility model, the front wheel positioning mechanism includes a front bayonet and a front elastic member, the front universal wheel includes a front wheel body and a front wheel connecting frame, the front wheel body is rotatably disposed on the front wheel connecting frame, the front wheel connecting frame is rotatably disposed on the wheel frame and enables the front wheel body to be universally rotated, the front wheel connecting frame is provided with a front pin hole for cooperating with the front bayonet, the front bayonet is telescopically movably disposed on the wheel frame, the front elastic member is disposed between the front bayonet and the wheel frame, and the front elastic member is used for enabling the front bayonet to have a tendency of elastic extension; when the front bayonet lock stretches out and is matched with the front pin hole, the front wheel connecting frame is fixed relative to the wheel frame; the front bayonet lock is connected with the control piece through the front linkage piece; when the control piece is positioned at the rear wheel positioning position, the control piece pulls the front bayonet through the front linkage piece to keep the front bayonet in a retracted state; when the control piece is positioned at the front wheel positioning position, the control piece releases the front bayonet lock through the front linkage piece, so that the front bayonet lock can elastically extend out and be inserted into the front pin hole.

According to some embodiments of the present utility model, the rear wheel positioning mechanism includes a rear bayonet and a rear elastic member, the rear universal wheel includes a rear wheel body and a rear wheel connecting frame, the rear wheel body is rotatably disposed on the rear wheel connecting frame, the rear wheel connecting frame is rotatably disposed on the wheel frame and enables the rear wheel body to be universally rotated, the rear wheel connecting frame is provided with a rear pin hole for being matched with the rear bayonet, the rear bayonet is telescopically movably disposed on the wheel frame, the rear elastic member is disposed between the rear bayonet and the wheel frame, and the rear elastic member is used for enabling the rear bayonet to have a tendency of elastic extension; when the rear bayonet lock stretches out and is matched with the rear pin hole, the rear wheel connecting frame is fixed relative to the wheel frame; the rear bayonet is connected with the control piece through the rear linkage piece; when the control piece is positioned at the front wheel positioning position, the control piece pulls the rear bayonet through the rear linkage piece to keep the rear bayonet in a retracted state; when the control piece is positioned at the rear wheel positioning position, the control piece releases the rear bayonet lock through the rear linkage piece, so that the rear bayonet lock can elastically extend out and be inserted into the rear pin hole.

According to some embodiments of the utility model, the control member is in the rear wheel positioning position when the handle frame is in the rear position; the handle frame is in the front position and the control is in the front wheel positioning position.

According to some embodiments of the utility model, the front universal wheels are arranged in two, the rear universal wheels are arranged in two, the reversing control mechanisms are correspondingly arranged in two groups, and each group of reversing control mechanisms controls one front universal wheel and one rear universal wheel.

A stroller according to an embodiment of the second aspect of the present utility model comprises a frame according to an embodiment of the first aspect of the present utility model.

The baby carrier provided by the embodiment of the utility model has at least the following beneficial effects: the reversing control mechanism of the baby carrier has the advantage of simple structure due to the frame of the embodiment of the first aspect of the utility model.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic view of a vehicle frame in which a handle frame is in a rear position, a traveling direction of a rear universal wheel is locked, and a front universal wheel is kept in universal rotation;

FIG. 2 is an exploded view of the structure of FIG. 1;

FIG. 3 is an enlarged schematic view of FIG. 2 at A;

FIG. 4 is an enlarged schematic view at B of FIG. 2;

FIG. 5 is an enlarged schematic view at C of FIG. 2;

FIG. 6 is an enlarged schematic view of FIG. 2 at D;

fig. 7 is a schematic view showing a structure in which a handle frame of a vehicle frame according to an embodiment of the present utility model is in a front side position, a traveling direction of a front universal wheel is locked, and the rear universal wheel is kept in universal rotation.

Reference numerals:

the wheel frame 100, the wheel frame joint 110 and the limit accommodating cavity 111;

front universal wheel 200, front wheel body 210, front wheel attachment frame 220, front pin hole 221;

rear universal wheel 300, rear wheel body 310, rear wheel connection frame 320, rear pin hole 321;

a front wheel positioning mechanism 400, a front bayonet 410, and a front elastic member 420;

rear wheel positioning mechanism 500, rear bayonet 510, rear elastic member 520;

a handle frame 600, a handle joint 610;

the reversing control mechanism 700, the control member 710, the driving member 720, the front linkage member 730, and the rear linkage member 740.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

Referring to fig. 1 to 7, a vehicle frame includes: wheel carrier 100, front universal wheel 200, rear universal wheel 300, front wheel positioning mechanism 400, rear wheel positioning mechanism 500, handle frame 600, and reversing control mechanism 700. The front universal wheel 200 and the rear universal wheel 300 are provided to the wheel frame 100. The front wheel positioning mechanism 400 is provided to the wheel frame 100 and can position the front universal wheel 200 to travel forward and backward (the traveling direction is defined as the forward-backward direction), and the rear wheel positioning mechanism 500 is provided to the wheel frame 100 and can position the rear universal wheel 300 to travel forward and backward (the traveling direction is defined as the forward-backward direction). The handle frame 600 is rotatably provided to the wheel frame 100 and is capable of switching between a front position and a rear position, and in the rear position, the handle frame 600 vertically corresponds to the rear universal wheel 300; in the front position, the handle frame 600 corresponds up and down to the front universal wheel 200. The reversing control mechanism 700 comprises a control member 710, a driving member 720, a front linkage member 730 and a rear linkage member 740, wherein the control member 710 is movably arranged on the wheel frame 100 and is provided with a front wheel positioning position and a rear wheel positioning position, and the control member 710 is respectively connected with the front wheel positioning mechanism 400 and the rear wheel positioning mechanism 500 through the front linkage member 730 and the rear linkage member 740; in the front wheel positioning position, the control member 710 positions the front wheel positioning mechanism 400 in the traveling direction of the front universal wheel 200 through the front link 730 and does not position the rear wheel positioning mechanism 500 in the traveling direction of the rear universal wheel 300 through the rear link 740; in the rear wheel positioning position, the control member 710 positions the rear wheel positioning mechanism 500 in the traveling direction of the rear universal wheel 300 through the rear link 740, and does not position the front wheel positioning mechanism 400 in the traveling direction of the front universal wheel 200 through the front link 730; the driving member 720 is disposed on the handle frame 600, and when the handle frame 600 rotates to the switching position, the driving member 720 can drive the control member 710 to switch the front wheel positioning position and the rear wheel positioning position.

When the frame is reversed, the handle frame 600 is rotated to be located at the front side position or the rear side position, and when the handle frame 600 is rotated, the control member 710 can be driven to switch positions by the driving member 720, and the control member 710 controls the positioning states of the front wheel positioning mechanism 400 and the rear wheel positioning mechanism 500 by the front linkage member 730 and the rear linkage member 740, so that one of the front universal wheel 200 and the rear universal wheel 300 keeps the universal travel and the other becomes the directional travel, thereby completing the reversing function of the frame. The frame controls the front wheel positioning mechanism 400 and the rear wheel positioning mechanism 500 through the position change of the single control member 710, and reduces the number of parts, thereby simplifying the structure and facilitating the assembly of products.

In an embodiment, the wheel carrier 100 is provided with a wheel carrier joint 110, the wheel carrier joint 110 is provided with a limiting accommodating cavity 111, the control member 710 is movably arranged in the limiting accommodating cavity 111, the handle frame 600 is provided with a handle joint 610, the handle joint 610 is hinged to the wheel carrier joint 110, the control member 710 is an annular body, the driving member 720 is an eccentric block arranged on the handle joint 610, and the driving member 720 is inserted into an inner hole of the control member 710. When the handle frame 600 rotates to switch positions, the eccentric block can be driven to rotate to change positions, and the eccentric block pushes the control member 710 at two different positions, so that the control member 710 can deflect to two different positions, namely a front wheel positioning position and a rear wheel positioning position. The control member 710 is driven by the structure, and the structure is simple and easy to implement.

In an embodiment, the driving member 720 and the handle joint 610 are integrally formed, which is convenient for manufacturing; of course, it is envisioned that the driver 720 could also be manufactured separately from the handle knuckle 610 and then assembled together. In an embodiment, the driver 720 is an eccentric mass structure, i.e., the geometric center of which is offset from the articulation axis of the handle joint 610.

In an embodiment, the inner side wall of the limiting accommodating cavity 111 is an arc surface, the control member 710 is an annular ring, the diameter of the control member is smaller than that of the limiting accommodating cavity 111, one end of the driving member 720 is provided with the arc surface, and the driving member 720 is matched with the inner hole wall of the control member 710 through the arc surface at one end of the driving member 720. With the above structure, the control member 710 moves smoothly when switching positions.

It is envisioned that in other embodiments, the driving of the control member 710 by the driving member 720 is not limited to the above-mentioned structure, for example, the driving member 720 may be a pressing member, the control member 710 is an elastic telescopic member, and the pressing member is moved by pressing the control member 710; it will be appreciated that many embodiments are known in the art for driving and repositioning one member over another, and that those skilled in the art will be able to implement the arrangement according to the circumstances.

In an embodiment, the front wheel positioning mechanism 400 includes a front bayonet 410 and a front elastic member 420, the front universal wheel 200 includes a front wheel body 210 and a front wheel link 220, the front wheel body 210 is rotatably disposed on the front wheel link 220, the front wheel link 220 is rotatably disposed on the wheel frame 100 and enables the front wheel body 210 to be universally rotated, the front wheel link 220 is provided with a front pin hole 221 for cooperating with the front bayonet 410, the front bayonet 410 is telescopically movably disposed on the wheel frame 100, the front elastic member 420 is disposed between the front bayonet 410 and the wheel frame 100, and the front elastic member 420 is used for enabling the front bayonet 410 to have a tendency of elastic extension; when the front bayonet 410 is extended and engaged with the front pin hole 221, the front wheel link 220 is fixed in position with respect to the wheel frame 100, thereby positioning the traveling direction of the front universal wheel 200; the front bayonet 410 is connected to the control member 710 by a front linkage 730; when the control member 710 is in the rear wheel positioning position, the control member 710 pulls the front bayonet 410 through the front linkage 730 to maintain the retracted state, so that the front caster 200 can maintain the caster; when the control member 710 is in the front wheel positioning position, the control member 710 releases the front bayonet 410 through the front link 730 so that the front bayonet 410 can be elastically extended and inserted into the front pin hole 221, thereby positioning the front universal wheel 200 in the traveling direction.

The rear wheel positioning mechanism 500 comprises a rear bayonet 510 and a rear elastic member 520, the rear universal wheel 300 comprises a rear wheel body 310 and a rear wheel connecting frame 320, the rear wheel body 310 is rotatably arranged on the rear wheel connecting frame 320, the rear wheel connecting frame 320 is rotatably arranged on the wheel frame 100 and enables the rear wheel body 310 to be universally rotated, the rear wheel connecting frame 320 is provided with a rear pin hole 321 for being matched with the rear bayonet 510, the rear bayonet 510 is telescopically movably arranged on the wheel frame 100, the rear elastic member 520 is arranged between the rear bayonet 510 and the wheel frame 100, and the rear elastic member 520 is used for enabling the rear bayonet 510 to have a trend of elastic extension; when the rear bayonet 510 extends out and cooperates with the rear pin hole 321, the rear wheel link 320 is fixed in position with respect to the wheel frame 100, thereby positioning the traveling direction of the rear universal wheel 300; the rear bayonet 510 is connected to the control member 710 via a rear linkage member 740; when the control member 710 is in the front wheel positioning position, the control member 710 pulls the rear bayonet 510 through the rear link 740 to maintain the retracted state, so that the rear universal wheel 300 can maintain universal rotation; when the control member 710 is at the rear wheel positioning position, the control member 710 releases the rear bayonet 510 through the rear link 740 so that the rear bayonet 510 can be elastically extended and inserted into the rear pin hole 321, thereby positioning the traveling direction of the rear universal wheel 300.

The front wheel positioning mechanism 400 and the rear wheel positioning mechanism 500 adopt elastically telescopic bayonet locks, and have simple structure and easy implementation. It is envisioned that in other embodiments, the front wheel alignment mechanism 400 and the rear wheel alignment mechanism 500 may be other structures, such as braking alignment by friction members, magnetic attraction alignment, etc., so long as the alignment of the corresponding travel directions of the front and rear universal wheels 200, 300 is achieved.

In an embodiment, the front linkage member 730 and the rear linkage member 740 are pull wires, and the pull wires are easy to realize remote linkage, and have a simple structure. It is envisioned that front linkage 730 and rear linkage 740 may be other structures, such as tie rods, etc.

In an embodiment, when the handle chassis 600 is in the rear position, the control 710 is in the rear wheel positioning position; the handle frame 600 is in a front side position, the control member 710 is in a front wheel positioning position, i.e., to which side the handle frame 600 is rotated, which side of the universal wheel locks the traveling direction, and the other side of the universal wheel maintains universal rotation, thereby facilitating the pushing use of the frame. Of course, for the pull cart structure, the correspondence relationship described above may be exchanged.

In the embodiment, two front universal wheels 200 and two rear universal wheels 300 are provided, two sets of steering control mechanisms 700 are correspondingly provided, and each set of steering control mechanisms 700 controls one front universal wheel 200 and one rear universal wheel 300.

The baby carrier provided by the utility model comprises the frame. The reversing control mechanism of the baby carrier has the advantage of simple structure due to the frame of the embodiment of the first aspect of the utility model.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The embodiments of the present utility model have been described in detail with reference to the accompanying drawings, but the present utility model is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present utility model.

Claims (8)

1. A vehicle frame, comprising:

a wheel frame (100);

a front universal wheel (200) provided on the wheel frame (100);

a rear universal wheel (300) provided on the wheel frame (100);

a front wheel positioning mechanism (400) which is provided to the wheel frame (100) and which can position the front universal wheel (200) to travel forward and backward;

a rear wheel positioning mechanism (500) which is provided to the wheel frame (100) and which can position the rear universal wheel (300) to travel forward and backward;

a handle frame (600) rotatably provided to the wheel frame (100) and capable of switching between a front position and a rear position, wherein the handle frame (600) vertically corresponds to the rear universal wheel (300); in the front side position, the handle frame (600) corresponds to the front universal wheel (200) up and down;

the reversing control mechanism (700) comprises a control piece (710), a driving piece (720), a front linkage piece (730) and a rear linkage piece (740), wherein the control piece (710) is movably arranged on the wheel frame (100) and is provided with a front wheel positioning position and a rear wheel positioning position, and the control piece (710) is respectively connected with the front wheel positioning mechanism (400) and the rear wheel positioning mechanism (500) through the front linkage piece (730) and the rear linkage piece (740); in the front wheel positioning position, the control member (710) causes the front wheel positioning mechanism (400) to position the traveling direction of the front universal wheel (200) through the front link (730), and causes the rear wheel positioning mechanism (500) to not position the traveling direction of the rear universal wheel (300) through the rear link (740); in the rear wheel positioning position, the control member (710) positions the rear wheel positioning mechanism (500) in the traveling direction of the rear universal wheel (300) through the rear link (740), and does not position the front wheel positioning mechanism (400) in the traveling direction of the front universal wheel (200) through the front link (730); the driving piece (720) is arranged on the handle frame (600), and when the handle frame (600) rotates to a switching position, the control piece (710) can be driven by the driving piece (720) to switch the front wheel positioning position and the rear wheel positioning position.

2. The frame of claim 1, wherein: the wheel carrier (100) is provided with wheel carrier joint (110), wheel carrier joint (110) are provided with spacing holding chamber (111), control spare (710) activity set up in spacing holding chamber (111), handle frame (600) are provided with handle joint (610), handle joint (610) articulate in wheel carrier joint (110), control spare (710) are the cyclic annular body, driving piece (720) for set up in the eccentric block of handle joint (610), driving piece (720) are inserted the hole of control spare (710).

3. The frame of claim 2, wherein: the inside wall of spacing holding chamber (111) is the arc surface, control piece (710) are the ring and the diameter is less than the diameter of spacing holding chamber (111), the one end of driving piece (720) is provided with the arc surface, driving piece (720) through the arc surface of its one end with the hole pore wall cooperation of control piece (710).

4. The frame of claim 1, wherein: the front wheel positioning mechanism (400) comprises a front bayonet lock (410) and a front elastic piece (420), the front universal wheel (200) comprises a front wheel body (210) and a front wheel connecting frame (220), the front wheel body (210) is rotatably arranged on the front wheel connecting frame (220), the front wheel connecting frame (220) is rotatably arranged on the wheel frame (100) and enables the front wheel body (210) to be universally rotated, the front wheel connecting frame (220) is provided with a front pin hole (221) for being matched with the front bayonet lock (410), the front bayonet lock (410) is telescopically movably arranged on the wheel frame (100), the front elastic piece (420) is arranged between the front bayonet lock (410) and the wheel frame (100), and the front elastic piece (420) is used for enabling the front bayonet lock (410) to have an elastic extending trend; when the front bayonet lock (410) extends out and is matched with the front pin hole (221), the front wheel connecting frame (220) is fixed relative to the wheel frame (100); the front bayonet (410) is connected with the control member (710) through the front linkage member (730); when the control member (710) is in the rear wheel positioning position, the control member (710) pulls the front bayonet (410) to be kept in a retracted state through the front linkage member (730); when the control member (710) is in the front wheel positioning position, the control member (710) releases the front bayonet (410) through the front link (730) so that the front bayonet (410) can be elastically extended and inserted into the front pin hole (221).

5. The frame as defined in claim 4, wherein: the rear wheel positioning mechanism (500) comprises a rear bayonet lock (510) and a rear elastic piece (520), the rear universal wheel (300) comprises a rear wheel body (310) and a rear wheel connecting frame (320), the rear wheel body (310) is rotatably arranged on the rear wheel connecting frame (320), the rear wheel connecting frame (320) is rotatably arranged on the wheel frame (100) and enables the rear wheel body (310) to be universally rotated, the rear wheel connecting frame (320) is provided with a rear pin hole (321) for being matched with the rear bayonet lock (510), the rear bayonet lock (510) is telescopically movably arranged on the wheel frame (100), the rear elastic piece (520) is arranged between the rear bayonet lock (510) and the wheel frame (100), and the rear elastic piece (520) is used for enabling the rear bayonet lock (510) to have a trend of elastic extension; when the rear bayonet lock (510) extends out and is matched with the rear pin hole (321), the rear wheel connecting frame (320) is fixed relative to the wheel frame (100); the rear bayonet (510) is connected with the control member (710) through the rear linkage member (740); when the control member (710) is in the front wheel positioning position, the control member (710) pulls the rear bayonet (510) through the rear linkage member (740) to keep the rear bayonet in a retracted state; when the control member (710) is in the rear wheel positioning position, the control member (710) releases the rear bayonet (510) through the rear linkage member (740) so that the rear bayonet (510) can elastically extend and be inserted into the rear pin hole (321).

6. The frame of claim 1 or 5, wherein: -said control (710) being in said rear wheel positioning position when said handle frame (600) is in said rear position; the handle frame (600) is in the front position and the control member (710) is in the front wheel positioning position.

7. The frame of claim 1, wherein: the front universal wheels (200) are arranged in two, the rear universal wheels (300) are arranged in two, two groups of reversing control mechanisms (700) are correspondingly arranged, and each group of reversing control mechanisms (700) controls one front universal wheel (200) and one rear universal wheel (300).

8. A stroller characterized by comprising a frame according to any of claims 1 to 7.