CN215398870U - Multifunctional handcart - Google Patents

Abstract

The utility model discloses a multifunctional trolley, which comprises a trolley frame and wheels arranged at the bottom of the trolley frame, wherein the trolley frame comprises two side frames which are oppositely arranged and a transverse connecting piece connected between the two side frames, the two side frames and the transverse connecting piece are integrally enclosed to form a cage-shaped structure with an open top, and a bearing area is arranged inside the cage-shaped structure; the side frame adopts a foldable four-bar linkage mechanism, in an unfolded state, two bar members in the four-bar linkage mechanism are horizontally arranged and positioned at the bottom edge of the side frame, and the other two bar members extend upwards and intersect at the first rotating joint; under the folding state, all the rod pieces in the four-bar mechanism are gathered together; the first rotating joint is provided with an adaptive seat, and the adaptive seat is matched with expansion equipment in a detachable mode in an inserting mode. The large-capacity cage-shaped structure at the bottom can have a large-capacity storage function under the condition that the expansion equipment is a seat; when the expansion equipment is a dinner plate, at least two children can be borne, the dinner plate can be shared, and safety and reliability are achieved.

Description

Multifunctional handcart

Technical Field

The application relates to the technical field of child carriers, in particular to a multifunctional trolley.

Background

The trolley is a carrier for carrying children and accessories indoors or outdoors, and is generally matched with a seat for children to sit on, and a dinner plate arranged on the seat for the children to eat food.

For example, chinese patent publication No. CN 101879910B discloses a double-seat stroller frame, in which a tray is only provided as a front seat for use, and when a user sits on the stroller frame for two seats, the length of the tray is increased, so that the front child may block the view of the rear child during eating or other states, and if an accident occurs during eating, the tray cannot be quickly detected, which may easily cause a safety accident. And the main function of this kind of double children's shallow is for taking two children, and corresponding the thing ability that leads to carrying is less, is difficult to go to change according to actual need and adapts to user's demand.

SUMMERY OF THE UTILITY MODEL

The application provides a multi-functional handcart that can fold solves current handcart and can't carry out the defect that the function changed as required.

The vehicle frame comprises two side frames which are oppositely arranged and a transverse connecting piece connected between the two side frames, the two side frames and the transverse connecting piece are integrally enclosed to form a cage-shaped structure with an open top, and a bearing area is arranged inside the cage-shaped structure;

the side frame adopts a foldable four-bar linkage mechanism, four rod pieces are sequentially hinged, in an unfolded state, two of the rod pieces are horizontally arranged and positioned at the bottom edge of the side frame, and the other two rod pieces extend upwards to intersect at the first rotating joint; under the folding state, all the rod pieces in the four-bar mechanism are gathered together;

the first rotating joint is provided with an adaptive seat, and the adaptive seat is detachably connected with an expansion device in an inserting and matching mode.

Several alternatives are provided below, but not as an additional limitation to the above general solution, but merely as a further addition or preference, each alternative being combinable individually for the above general solution or among several alternatives without technical or logical contradictions.

Optionally, an adapter matched with the adapter seat is arranged on the expansion device, and a locking device for limiting separation of the adapter seat and the adapter is arranged between the adapter seat and the adapter.

Optionally, one of the adapter and the adapter seat is provided with a guide groove for guiding installation, and the other is provided with a guide block matched with the guide groove.

Optionally, the locking device includes a locking groove disposed on the adapter, a locking pin slidably mounted on the adapter and engaged with the locking groove, and a first elastic member urging the locking pin to extend into the locking groove;

the locking pin has a locked state extending into the locking slot and an unlocked state exiting the locking slot.

Optionally, an unlocking device for unlocking the locking device is arranged on the adapter, the unlocking device comprises an unlocking piece slidably mounted on the adapter, and a second elastic piece for urging the unlocking piece to reset, and the unlocking piece slides to drive the locking pin to exit from the locking groove.

Optionally, a guiding mechanism for driving the locking pin to enter the unlocking state is arranged between the locking pin and the unlocking member, and the guiding mechanism includes:

a guide portion provided on the lock pin;

a guide portion provided on the unlocking piece and abutting against the guide portion.

Optionally, the expansion device includes a seat, and the unlocking member is provided with a handle portion for sliding unlocking.

Optionally, the expansion device includes a tray, and the unlocking member is provided with a pressing portion protruding above the tray surface for pressing and unlocking.

Optionally, in the unfolded state, the dish is kept horizontal, and in the folded state, the dish rotates vertically and can be used as a handle for carrying the frame.

Optionally, an inner pocket for loading children or articles is arranged in the bearing area.

The utility model provides a multifunctional trolley is provided with the cage structure of large capacity and bears multiple children or loads article, and supporting extension equipment can be the dinner plate that supplies multiple children to share or the seat that supplies a children to take, makes the function diversified, satisfies user's multi-functional change demand.

Drawings

FIG. 1 is a perspective view of a multi-function cart according to an embodiment of the present application;

FIG. 2 is a perspective view of a multi-function cart with a tray according to another embodiment of the present application;

FIG. 3 is a perspective view of a multi-function cart with additional seating according to one embodiment of the present application;

FIG. 4 is an enlarged view of section E of FIG. 3;

FIG. 5 is an exploded view of the adapter corresponding to FIG. 3;

FIG. 6 is a perspective view of a locking pin of the multi-function cart according to an embodiment of the present application;

FIG. 7 is a perspective view of an unlocking member of the multi-function cart according to an embodiment of the present application;

FIG. 8 is a front view of the adapter corresponding to FIG. 3;

FIG. 9 is a cross-sectional view of section A-A of the multi-function cart according to an embodiment of the present application;

FIG. 10 is a cross-sectional view of section B-B of the multi-function cart according to an embodiment of the present application;

FIG. 11 is the release state view of FIG. 9;

FIG. 12 is the release state view of FIG. 10;

FIG. 13 is a view of the tray mounted in the multipurpose cart of an embodiment of the present application;

FIG. 14 is an exploded view of the adapter corresponding to FIG. 13;

FIG. 15 is a front view of the adapter corresponding to FIG. 13;

FIG. 16 is a cross-sectional view taken along line C-C of FIG. 15;

FIG. 17 is a cross-sectional view taken along line D-D of FIG. 15;

FIG. 18 is the release state view of FIG. 16;

FIG. 19 is the release condition view of FIG. 17;

FIG. 20 is a transverse perspective expanded view of a multi-function cart according to an embodiment of the present application;

fig. 21 is a folding view of the basket in the multi-functional cart according to an embodiment of the present application;

fig. 22 is a side view of the multi-purpose cart of the present application;

FIG. 23 is a view of the foldable handlebar assembly of the multi-purpose stroller in accordance with an embodiment of the present invention;

FIG. 24 is a collapsed view of the four bar linkage mechanism of the multi-function cart of an embodiment of the present application;

fig. 25 is a view of the multi-function cart according to an embodiment of the present application in a collapsed state.

The reference numerals in the figures are illustrated as follows:

1. a side frame; 2. an inner pocket; 3. a transverse connector; 5. an expansion device; 6. a handle bar;

11. a load-bearing zone; 12. a sinking zone; 13. a front diagonal brace rod; 14. a rear diagonal brace rod; 15. a front longitudinal support rod;

16. a rear longitudinal supporting rod; 17. a first revolute joint; 18. a second revolute joint; 31. side blocking; 32. a transverse supporting rod;

33. a storage basket; 41. a front wheel; 42. a rear wheel; 51. a dinner plate; 52. a seat; 53. an adapter; 61. a lower handle bar;

62. an upper handle bar;

171. an adapter base; 172. a guide block; 173. a locking groove; 331. a support frame; 332. a basket body; 531. a guide groove;

532. a locking pin; 533. a first elastic member; 534. unlocking the lock; 535. a second elastic member;

5311. an opening; 5321. an abutting portion; 5322. a guide portion; 5341. a guide section; 5342. a handle part;

5343. a pressing part.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In this application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any particular order or number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

The application provides a multifunctional handcart, including folding frame and install in the wheel of bottom, whole car has the expansion state that bears children's removal and folds into platelike state of folding up, and the wheel includes front wheel and rear wheel, supplies the handcart to remove, and wherein, the front wheel is the universal wheel for turn to the operation, and the rear wheel is directional wheel. The frame has opposite lateral and longitudinal directions, and the longitudinal and lateral directions mentioned in the following embodiments define, when not specifically described, the direction in which the line connecting the front and rear wheels is located, and the lateral direction is perpendicular to the longitudinal direction.

Referring to fig. 1 to 3 and 20 to 25, in one embodiment, the frame includes two side frames 1 disposed opposite to each other and a transverse connecting member connecting the two side frames 1, the two side frames 1 and the transverse connecting member together form a cage structure with an open top, and a carrying area 11 for carrying a child or carrying goods is formed inside the cage structure. Wherein the cross-links typically comprise reinforcing bars as cage structures and other bar members that enclose the side frames 1 in a cage structure.

The side frame 1 adopts a foldable four-bar linkage mechanism, four bar members are sequentially hinged in an unfolded state, two of the bar members are horizontally arranged and positioned at the edge of the bottom of the frame, and are connected with part of the bar members in the transverse connecting member to be used as a bottom frame for supporting a cage-shaped structure, the other two bar members extend upwards in an inclined way and are mutually hinged with a first rotating joint 17, and the first rotating joint 17 is positioned in the longitudinal middle of the frame. In this embodiment, the rotational joint has two rotationally connected portions, each of which may be independent from the rod or may be a part of the rod, and is not limited to the structure shown in the drawings.

Two member of slope and the partial member in the transverse connection piece 3 are connected as cage structure's round frame all around, and whole cage structure is the cuboid shape, and the top is opened, can place two at least toddlers to bearing area 11, and four members are the triangle-shaped structure, have improved the intensity of whole frame.

Under the folding state, two horizontal rods rotate relatively and draw close to each other, the rods arranged obliquely are driven to rotate and draw close to each other, and the four-bar mechanism finally draws close to facilitate storage. The first rotating joint 17 is provided with an adapting seat 171, the adapting seat 171 is detachably inserted and matched with an expansion device, and the expansion device 5 can be any accessory capable of being attached to a child carrier, such as a seat, a dinner plate, a baby crib or a drawing board, and can also be a telescopic plate capable of covering the top of the cage-shaped structure.

The trolley is provided with a cage structure at least containing two children, and the expansion device 5 is positioned in the middle part, so that the interaction between the children is convenient, for example, when a dinner plate is used, the two children can share the expansion device and are all in the visual field range of a nursing person, and the potential safety hazard in the feeding process is eliminated; or after the chair or the crib is matched, the bottom has the storage capacity with the ultra-large capacity, so that shopping with the baby is facilitated; or the telescopic plate used for sealing the top is replaced, so that the privacy in the cage-shaped structure is protected and the rainproof and sun-proof effects are achieved.

Referring to fig. 3 to 5, in one embodiment, the expansion device 5 is provided with an adapter 53 that is matched with the adapter seat 171, and a locking device that limits the separation of the adapter seat 171 and the adapter 53 is provided between them, so as to avoid accidental falling off and protect the safety of the expansion device 5. In the preferred embodiment, a guiding mechanism for guiding the installation is provided between the adapter 53 and the adapter 171, and specifically includes a guiding groove 531 formed on the adapter 53 and a guiding block 172 provided on the adapter 171 for facilitating the installation, so that the locking devices can be smoothly locked with each other. In the preferred embodiment, the guide groove 531 has an opening 5311 that is flared to preferentially contact the guide block 172 during installation, further facilitating installation.

Referring to fig. 4 to 19, in one embodiment, the locking device includes a locking groove 173, a locking pin 532 and a first elastic member 533, wherein the locking groove 173 is opened on the adapter 171, the locking pin 532 is slidably mounted on the adaptor 53 to be matched with the locking groove 173, the first elastic member 533 abuts against the locking pin 532, and the locking device includes:

in the locked state, the first elastic member 533 drives the locking pin 532 to extend into the locking groove 173, and the adaptor 53 and the adapter 171 cannot be separated from each other;

in the unlocked state, the locking pin 532 slides out of the locking groove 173 and compresses the first elastic member 533, so that the adaptor 53 can be detached from the adaptor seat 171 at any time.

Referring to fig. 4 to 19 again, in one embodiment, the adaptor 53 is provided with an unlocking device for unlocking the locking device, the unlocking device includes an unlocking member 534 slidably mounted on the adaptor 53, and a second elastic member 535 for restoring the unlocking member 534, and the unlocking member 534 slidably drives the locking pin 532 to exit the locking groove 173. The unlocking member 534 slides in a direction perpendicular to the locking pin 532, and specifically, the unlocking member 534 slides up or down to compress the second elastic member 535, so as to force the locking pin 532 to exit the locking groove 173 and enter the unlocking state. The locking pin 532 has an abutting portion 5321 abutting against the adapter 171 when being installed, the abutting portion 5321 is an inclined surface, the abutting portion 5321 abuts against the adapter 171 and drives the locking pin 532 to slide and retract into the adapter 53, and after aligning with the locking groove 173, the locking pin is extended into and enters a locking state by the first elastic member 533.

Referring again to fig. 4-19, in one embodiment, a guiding mechanism for urging the locking pin 532 into the unlocking state is disposed between the locking pin 532 and the unlocking member 534, and the guiding mechanism includes: a guide portion 5322 and a guide portion 5341, the guide portion 5322 being hemispherical and disposed on the locking pin 532, the guide portion 5341 having an inclined surface disposed on the unlocking member 534 and abutting against the guide portion 5322. The specific lock releasing operation is as follows: the unlocking member 534 is pressed and moved, and abuts against the guide portion 5322 by means of the inclined surface of the guide portion 5341, so that the locking pin 532 is driven to slide into the unlocking state; the unlocking member 534 is released, the second elastic member 535 urges the unlocking member 534 to reset, and the first elastic member 533 urges the locking pin 532 into the locking state.

Referring to fig. 7 and 8, in one embodiment, the expansion device 5 is a seat 52, and the unlocking member 534 has a handle portion 5342 for sliding unlocking, so as to facilitate upward pulling and detachment after sliding unlocking.

Referring to fig. 13 and 14, in one embodiment, the expansion device 5 is a dinner plate 51, and the unlocking member 534 is provided with a pressing portion 5343 protruding above the surface of the dinner plate for pressing and unlocking, so as to facilitate downward pressing and unlocking, and then pulling and disassembling upward after grasping. In the preferred embodiment, the tray 51 is plate-shaped, and in the unfolded state, the tray 51 is kept horizontal for the children to place food, and in the folded state, the adapter 171 is rotated, so that the tray 51 is rotated synchronously and is vertical to the horizontal plane, and can be used as a handle of the carrying frame.

The utility model provides a handcart has under the appearance volume that is close current single handcart, more current handcart of taking the seat compares, the regional setting that will bear children is in the bottom of seat, the longest distance of make full use of frame, cooperation transverse connection spare forms the cage structure of great capacity, can bear two children at least, the memory capacity of handcart has been promoted, and the four-bar linkage of side bearer can fold, portable, and compare in current horizontal folding double handcart, moreover, the steam generator is simple in structure, folding smoothness.

Referring to fig. 20-25, in one embodiment, an open-top inner pocket 2 is provided inside the cage structure for holding a child or an object, so as to protect the child or the object in the cage structure from falling out of the frame and make the child more comfortable inside the cage structure. Interior pocket 2 can be deformed, and the vehicle-mounted frame is folded up in step, compares in the multi-functional handcart that the seat need be dismantled to the tradition, is convenient for fold and accomodates.

Referring to fig. 20 again, in one embodiment, the transverse connecting member 3 includes side blocks 31 hinged to two longitudinal sides of the frame and a plurality of cross braces 32 arranged at the bottom of the side frames, the side blocks 31 and the side frames 1 form a frame with a circle around the cage structure, and the cross braces 32 and the side frames 1 form a supporting frame with the cage structure. Interior pocket 2 hangs or overlaps and establish on side fender 31 and the collet on horizontal support rod 32, has guaranteed the support intensity of interior pocket 2, and the children of being convenient for move about in inside to and guarantee the structural strength that the large capacity loaded article.

In one embodiment, the bottom of the frame is an avoiding space in the longitudinal middle region, the inner bag 2 is provided with a sinking area 12 corresponding to the avoiding space, the sinking area 12 is used for placing two feet of children, comfort of multiple children during bearing is guaranteed, and if the bottom smoothness of the bearing area 11 is kept, the structure of the inner bag 2 can be adjusted, for example, a whole pad (not shown) is additionally arranged, so that the children can move conveniently.

In one embodiment, the side frame 1 includes a front diagonal brace 13, a rear diagonal brace 14, a front longitudinal brace 15, and a rear longitudinal brace 16, the tops of the front diagonal brace 13 and the rear diagonal brace 14 are hinged to a first rotating joint 17, one ends of the front longitudinal brace 15 and the rear longitudinal brace 16 are hinged to a second rotating joint 18, the other end of the front longitudinal brace 15 is hinged to the bottom of the front diagonal brace 13, and the other end of the rear longitudinal brace 16 is hinged to the bottom of the rear diagonal brace 14. In the unfolded state, the front longitudinal support rod 15 and the rear longitudinal support rod 16 are horizontally arranged to form a flat rectangular support frame with the transverse support rod 32; in the folded state, the first rotary joint 17 and the second rotary joint 18 are adjacent to each other, specifically: the front longitudinal supporting rod 15 and the rear longitudinal supporting rod 16 rotate relatively, the second rotating joint 18 moves upwards, the front diagonal supporting rod and the rear diagonal supporting rod are pulled to rotate around the first rotating joint 17 and approach to each other, and finally the folding is carried out.

In one embodiment, the front longitudinal support rod 15 and the rear longitudinal support rod 16 are coplanar, the front diagonal support rod 13 and the rear diagonal support rod 14 are coplanar, the front longitudinal support rod 15 is positioned on the opposite inner side of the front diagonal support rod 13, and in an unfolded state, the four rod pieces form a triangular frame, so that the structural strength of the frame is improved. At the transverse visual angle of the folding state, at least one longitudinal supporting rod is overlapped with the corresponding diagonal brace rod, so that the front diagonal brace rod and the rear diagonal brace rod are further drawn together, and the volume after folding is reduced. In a preferred embodiment, the bottom of the frame is provided with a front wheel 41 and a rear wheel 42 for the frame to move, the front wheel 41 and the rear wheel 42 are transversely staggered, and the front wheel 41 and the rear wheel 42 are partially or completely overlapped when folded under a transverse view angle, so that the volume of the folded frame is further reduced.

In order to reduce the volume of the whole vehicle as much as possible, in one embodiment, the side stop 31 is a U-shaped frame formed by bending a pipe or assembling a plurality of pipes, the two open ends of the U-shaped frame are hinged to the side frames 1, and the closed end faces upwards to be movably sleeved by the inner bag 2. And the side block 31 is positioned at the opposite inner side of the side frame 1, and under the folding state of a transverse view angle, the side block 31 is overlapped with the side frame 1, so that the volume of the folded frame is reduced.

In one embodiment, at least one side block 31 is provided with a storage basket 33 for loading articles, and preferably, the storage basket 33 and the side block 31 are movably installed, which is beneficial to reducing the folding volume. The basket 33 comprises a rigid support frame 331 hinged to the side stop 31 and a deformable basket body 332. The supporting frames 331 are located at the opposite inner sides of the side blocks 31, and are overlapped with each other in the folding state at the transverse viewing angle, so that the corresponding basket bodies 332 can be deformed and folded synchronously, and the volume of the folded whole vehicle is kept unchanged while the carrying capacity of the articles is improved.

In one embodiment, the first rotating joint 17 is disposed in the middle and is provided with the handle bar 6 in a swinging manner, in a folding state, each rod piece in the four-bar mechanism and the handle bar 6 are gathered together, and the handle bar 6 can be synchronously folded by being linked with one rod piece of the four-bar mechanism through a connecting rod or can be independently folded. The handle bar 6 is obliquely arranged with the horizontal plane in the unfolded state, so that force can be effectively transmitted to the bottom of the frame, and the cart is convenient to control. And the handle rod 6 and the side frame 1 only have one connecting part, so that the height of the side frame can be reduced compared with the traditional structure, and the frame is more exquisite and concise.

In one embodiment, the handle bar 6 is a straight bar in the transverse view, and the handle bar 6 forms an included angle α with the longitudinal direction of the frame, the included angle α satisfies that α is more than 45 degrees and less than 60 degrees, so that the pushing is convenient, and the inclined bar and one of the inclined bars incline in the same direction, and the appearance is simple. In the preferred embodiment, the handle bar 6 is collinear with a diagonal bar, so that the appearance is more concise, the acting force can be effectively transmitted to the wheels, and the steering operation is facilitated.

In one embodiment, the handle bar 6 comprises a lower handle bar 61 and an upper handle bar 62 slidably mounted on the lower handle bar 61, and the upper handle bar 62 is slidably sleeved inside the lower handle bar 61 or outside the lower handle bar 61, so as to facilitate children caregivers with different heights.

The utility model provides a multifunctional handcart changes the seat below into and bears children or the cage structure of loading article to install extension equipment additional in the middle part of side bearer, according to different demands, for example the dinner plate, can be for the sharing of many children in the cage structure, and be in caregiver's sight range, eliminated the potential safety hazard of feed process. Or the lower part of the seat for children to sit is changed into a storage space with ultra-large capacity, and the seat can also be an expansion plate which covers the top of the cage-shaped structure and shields wind and rain.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features. When technical features in different embodiments are represented in the same drawing, it can be seen that the drawing also discloses a combination of the embodiments concerned.

The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application.

Claims (10)

1. The multifunctional trolley comprises a trolley frame and wheels arranged at the bottom of the trolley frame, and is characterized in that the trolley frame comprises two side frames which are oppositely arranged and a transverse connecting piece connected between the two side frames, the two side frames and the transverse connecting piece are integrally enclosed to form a cage-shaped structure with an open top, and a bearing area is arranged inside the cage-shaped structure;

the side frame adopts a foldable four-bar linkage mechanism, four rod pieces are sequentially hinged, in an unfolded state, two of the rod pieces are horizontally arranged and positioned at the bottom edge of the side frame, and the other two rod pieces extend upwards to intersect at the first rotating joint; under the folding state, all the rod pieces in the four-bar mechanism are gathered together;

the first rotating joint is provided with an adaptive seat, and the adaptive seat is detachably connected with an expansion device in an inserting and matching mode.

2. A multi-function trolley according to claim 1, wherein the expansion device is provided with an adapter which is adapted to cooperate with the adapter socket, and wherein a locking means is provided between the adapter socket and the adapter to restrict separation of the adapter socket and the adapter socket.

3. A multipurpose trolley according to claim 2, characterized in that a guide groove for guiding the mounting is provided on one of the adapter and the adapter seat, and a guide block is provided on the other to cooperate with the guide groove.

4. The multi-function cart of claim 2, wherein the locking means comprises a locking slot disposed on the adapter receptacle, a locking pin slidably mounted on the adapter to engage the locking slot, and a first resilient member urging the locking pin into the locking slot;

the locking pin has a locked state extending into the locking slot and an unlocked state exiting the locking slot.

5. A multi-function cart as recited in claim 4, wherein the adapter is provided with an unlocking means for unlocking the locking means, the unlocking means comprising an unlocking member slidably mounted on the adapter, the unlocking member slidably urging the locking pin out of the locking slot, and a second resilient member urging the unlocking member to return.

6. The multi-function cart of claim 5, wherein a guide mechanism is disposed between the latch pin and the unlatching member to urge the latch pin into the unlatched condition, the guide mechanism comprising:

a guide portion provided on the lock pin;

a guide portion provided on the unlocking piece and abutting against the guide portion.

7. A multi-function cart as recited in claim 5, wherein said expansion device includes a seat, said unlocking member being provided with a handle portion for sliding unlocking.

8. The multi-function cart of claim 5, wherein the expansion device comprises a tray, and the unlocking member is provided with a pressing portion protruding above a surface of the tray for pressing the unlocking member.

9. The multi-function cart of claim 8, wherein the tray is horizontal in an unfolded position and rotates vertically in a folded position to serve as a handle for a carrying cart.

10. A multi-function trolley according to claim 1, wherein an inner pocket is provided in the carrying area for carrying children or goods.

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