CN110803206A - Multifunctional folding trolley - Google Patents

Abstract

A multifunctional folding trolley includes a frame, which is composed of a front wall, two side walls and a rear wall; the front wall and the rear wall are composed of a frame composed of connecting rods, and the two side walls are composed of scissors It also includes an angle-adjustable cart mechanism, which is connected to the upper part of the rear side of the rear wall frame; Fitted with two tires for quick loading and unloading. The invention provides a multifunctional folding trolley suitable for various occasions and folding in two rounds.

Description

Multifunctional folding trolley

technical field

The invention relates to the technical field of trolleys, in particular to a multifunctional folding trolley.

Background technique

After the existing four-wheel folding trolley is opened, the area is large and the turning radius is large. It is inconvenient to carry the goods. Although two-wheeled loading and unloading trucks can solve these problems, the number of scattered and small goods is less.

SUMMARY OF THE INVENTION

In order to overcome the defects of the existing trolley, the present invention provides a multifunctional folding trolley which is suitable for various occasions and can be folded by two wheels.

The technical scheme adopted by the present invention to solve its technical problems is:

A multifunctional folding cart comprising:

a frame, the frame is composed of a front wall, two side walls and a rear wall; the front wall and the rear wall are composed of a frame composed of connecting rods, and the two side walls are composed of scissor-type connecting rod assemblies;

The lower ends of the scissor-type link assemblies of the two side walls are respectively connected to the lower parts of the frames of the front and rear walls, and the upper ends are respectively connected to the upper parts of the frames of the front and rear walls. When the frame is folded and unfolded, the scissors of the two side walls The upper end of the type connecting rod assembly slides along the frame of the front wall and the rear wall, thereby narrowing and spreading the distance between the front wall and the rear wall;

Also includes a reversible supporting plate mechanism, the supporting plate mechanism is connected to the lower part of the front side of the front wall frame, and uses the front wall frame to limit the turning angle;

At the same time, it also includes an angle-adjustable cart mechanism, which is connected to the upper part of the rear side of the rear wall frame; two tires;

A flexible liner is secured to the frame and forms an open-top interior cargo bed within the cart frame when the cart is in the deployed state, with a flat plate placed on the bottom of the cargo bed.

Further, the front wall is firmly connected by rods to form a rectangular frame structure.

The rear wall is firmly connected by rods to form an H-shaped frame structure.

The scissor-type connecting rod assembly of the side wall is composed of a set of crossed X-shaped rods. The lower end is connected to the lower part of the rear wall frame, and the upper end is connected to the upper part of the front wall frame; when the frame is folded and unfolded, the upper ends of the scissor-type link assemblies of the two side walls slide up and down along the frames of the front and rear walls.

The front wall is an inverted U-shaped pallet connection pipe, the rear wall is composed of two risers and a handle pipe, the side wall includes two sets of cross tubes and two right-angle curved sliders, and the two sets of cross tubes are arranged symmetrically on the left and right sides. The front and rear ends of one of the cross pipes in each group of cross pipes are hinged with a straight slider respectively, and the straight slider located on the front side is sleeved on the corresponding side vertical pipe of the inverted U-shaped pallet connecting pipe and is connected with the vertical block. A pair of upper and lower sliders is formed, and a limit sleeve is also fixedly installed on the vertical pipe of the inverted U-shaped support plate connecting pipe. On the riser on the corresponding side and fixedly connected with the riser; the front and rear ends of the other cross pipe are hinged with a curved block and a right-angle curved block respectively, and the curved block is fixedly installed on the inverted U-shaped pallet connection The vertical tube on the corresponding side of the tube is located below the limit sleeve, and the right-angle curved sliding block can be slid up and down on the corresponding side of the vertical pipe and is set above the straight sliding block on the rear side. The blocks are connected by a handle pipe, and the upper parts of the two risers are connected by a connecting pipe.

Still further, the support plate mechanism is laid on the rod system by a flat plate, connected to the lower part of the front side of the front wall frame by hinges, and can be turned to be parallel and vertical to the front wall frame.

The supporting plate mechanism includes a U-shaped bottom frame with an opening facing the folding mechanism, three bottom horizontal tubes, a plastic plate and two sets of L-shaped iron sheets, and two bottoms for supporting the plastic plate are fixed in the middle of the U-shaped bottom frame. The horizontal tube is covered with a plastic plate. Each group of L-shaped iron sheets contains two L-shaped iron sheets. One side of the two sets of L-shaped iron sheets is clamped and fixed on the left and right ends of the U-shaped bottom frame respectively. The other sides of the two sets of L-shaped iron sheets are respectively clamped and riveted on the left and right ends of the inverted U-shaped pallet connection pipe by rivets, so that the pallet mechanism rotates 90° around the rivet axis. The top of each end cannot move on the arc surface of the connecting pipe of the pallet, and the third bottom horizontal pipe is connected to the two L-shaped iron pieces located on the inner side.

Still further, the cart mechanism is formed by connecting a rotation locking mechanism fixed to the upper part of the rear side of the rear wall frame and the handrail pipe. Connecting and disconnecting the two limit seats plays the role of locking and releasing rotation. The armrest rotation locking structure includes a limit seat, a limit slider, a spring, a button seat and a button for pushing the limit slider to move, and the limit seat and the button seat are fixed by rivets and formed by clasp. A limit slider and a spring are installed in the cavity. The limit slider is annular. The limit seat and the button seat are provided with wave-shaped grooves of the same size on the inner circumferential fold of the buckle cavity. The outer circumferential wall of the slider is provided with a wave-shaped protrusion that engages with the wave-shaped groove, and the thickness of the limit slider is slightly smaller than the depth of the buckle cavity of the limit seat, and far greater than the depth of the buckle cavity of the button seat. ; Both the limit slider and the spring are sheathed outside the rivet, one end of the spring is connected with the limit seat, and the other end is connected with the limit slider;

The button is installed on the button seat, and the button is provided with four claws, which correspond to the four holes on the button seat, the four holes on the button seat are communicated with the cavity, and the four claws on the button pass through The four holes on the button seat are in contact with the limit slider;

The limit seat is provided with a sleeve connected with the U-shaped handrail pipe, and the button seat is provided with a sleeve connected with the upper end of the riser.

Still further, the axle mechanism is composed of an axle tube fixed on the lower part of the rear side of the rear wall frame and a limit axle that is inserted into the axle tube and sheathed with tires; quick loading and unloading.

The axle mechanism includes two tires, two limit axles, two elastic buckles, two plastic axle connecting sleeves and an axle tube, and each plastic axle connecting sleeve is composed of a horizontal tube and a vertical tube that are perpendicular to each other, The horizontal pipes of the two plastic axle connecting sleeves are respectively inserted into the left and right ends of the axle pipes and fixed, and the vertical pipes are respectively inserted into the lower ends of the two vertical pipes and fixed; The tire is assembled in the center hole, and the other end is connected with the quick release of the axle tube through the elastic buckle.

Further, the flat plate at the bottom of the cargo box can be separated from the cargo box, and the size is consistent with the bottom of the cargo box.

The beneficial effects of the present invention are mainly manifested in: it can be folded, and after opening, it can load and stack heavy goods such as steel cylinders, iron drums, boxes, etc. like a two-wheeled loading and unloading truck, and can also load small and scattered goods like a four-wheeled trolley. ; And can be used in various road conditions and places by changing the type of tires, such as: garbage trucks, shopping carts, luggage carts, vans, etc.

Description of drawings

Figure 1 is a schematic structural diagram of the present invention.

Fig. 2 is a view showing the opened state of the frame.

FIG. 3 is a view of the half-folded state of the frame.

Figure 4 is a view of the frame in a fully folded state.

Fig. 5 is a side view of the frame.

Figure 6 is a rear view of the frame.

Fig. 7 is a front view of the frame.

FIG. 8 is a plan view of the frame.

Fig. 9 is a bottom view of the frame.

Figure 10 is a schematic diagram of the structure of the frame.

Figure 11 is an exploded view of the pallet mechanism.

Figure 12 is a schematic diagram of the folding mechanism.

Figure 13 is an exploded view of the armrest mechanism.

Figure 14 is an exploded view of the axle mechanism.

Figure 15 is an exploded view of the armrest rotation locking structure.

Fig. 16 is a schematic view of the outside of the right button base.

Fig. 17 is a schematic view of the inner side of the right limit seat.

FIG. 18 is a state diagram of FIG. 15 when the key is not pressed.

FIG. 19 is a cross-sectional view taken along line A-A of FIG. 18 .

FIG. 20 is a state diagram of FIG. 15 when the key is pressed.

FIG. 21 is a cross-sectional view taken along the line B-B in FIG. 20 .

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

Referring to FIGS. 1-21 , a multifunctional folding trolley consists of four parts: a pallet mechanism A, a folding mechanism B, a cart mechanism C and an axle mechanism D, as shown in FIG. 10 . Among them, the folding mechanism B is the main body, and the supporting plate mechanism A, the cart mechanism C and the axle mechanism D are all supported on the folding mechanism B. The pallet mechanism A is used for stacking items in boxes or inconvenient to load and unload. The folding mechanism B is provided with cloth or other structures that can enclose the carriage, and the carriage is opened and folded through the folding mechanism B. The cart mechanism C is used for pushing and pulling a cart. The axle mechanism D is used to drive the trolley to move.

The folding mechanism B consists of two curved sliders 5, four cross tubes 6, four limit sleeves 7, four straight sliders 8, an inverted U-shaped pallet connection tube 9, a connection tube 10, two Root stand pipe 11, two right-angle curved sliding blocks 12 and handle pipe 13 are made, see Figure 12. The four cross tubes 6 form two sets of cross structures. In each set of cross structures, a straight slider 8 is riveted to the front and rear ends of one cross tube 6, and a curved slider 5 is riveted to the front end of the other cross tube 6. The rear end is riveted with a right-angle curved slider 12 . Among them, in the cross structure, the bent slider 5 riveted at the lower part of a cross pipe 6 is fixed on the vertical pipe of the inverted U-shaped pallet connecting pipe 9, and the upper riveted right-angle bent slider 12 is sleeved on the vertical pipe 11; the other cross The straight sliding block 8 riveted at the lower part of the pipe 6 is fixed on the riser pipe 11 on the same side, and the straight sliding block 8 riveted at the upper part is sleeved on the vertical pipe on the same side of the inverted U-shaped pallet connecting pipe 9 . In order to limit the opening length, a limiting sleeve 7 is respectively fixed on the two vertical pipes and the two vertical pipes 11 of the inverted U-shaped pallet connecting pipe 9 . The connecting pipe 10 is fixed between the two stand pipes 11 , and the handle pipe 13 connects the two right-angled sliding blocks 12 together. A flexible lining is provided on the folding mechanism.

The pallet mechanism A consists of four L-shaped iron sheets 1, three bottom horizontal tubes 2, a U-shaped bottom frame 3 and a plastic plate 4, as shown in Figure 11. The middle of the U-shaped bottom frame 3 is fixed with two bottom horizontal tubes for supporting the plastic plate 4 , which are covered with the plastic plate 4 . One side of the four L-shaped iron sheets 1 is clamped and fixed to the two ends of the U-shaped bottom frame 3 in groups of two, and the other side is clamped to the two ends of the inverted U-shaped pallet connection pipe 9 and riveted. on it. The third bottom horizontal tube connects the two L-shaped iron pieces located on the inner side. After the pallet mechanism A is rotated 90° around the rivet axis, the two ends of the U-shaped bottom frame 3 abut on the arc surface of the inverted U-shaped pallet connection pipe 9 and cannot move.

The cart mechanism C consists of two buttons 14, a pair of mutually symmetrical button seats, two limit sliders 16, two springs 17, a pair of mutually symmetrical limit seats, two rivets 19, and a U-shaped handrail The composition of the tube 20 is shown in FIG. 13 . The pair of button seats are the right button seat 15 and the left button seat 22 respectively, the pair of limit seats are the right limit seat 18 and the left limit seat 21 respectively, and the right limit seat 18 and the right button seat 15 are buckled together. A limit slider 16 and a spring 17 are installed in the cavity and fixed by rivets 19 . On the outside of the right button base 15, through the four holes on it, there are installed buttons 14 that can push the limit slider 16 to move, as shown in FIG. 15 . Since the right limit seat 18 and the right button seat 15 have wave-shaped grooves of the same size on the inner circumferential wall of the buckling cavity, and the circumferential outer wall of the limit slider 16 also has wave-shaped protrusions that mesh with them The thickness of the limit slider 16 is slightly smaller than the depth of the buckling cavity of the right limit seat 18 , and much larger than the depth of the buckling cavity of the right button seat 15 . Therefore, when the button 14 is not pressed, as shown in FIG. 18 , the limit slider 16 is pressed against the inner wall of the right button seat 15 under the force of the spring 17 . When the wave-shaped protrusion on the outer circumferential wall of the limit slider 16 engages with the wave-shaped groove on the circumferential inner wall of the right button seat 15, it also meshes with the wave-shaped groove on the circumferential inner wall of the right limit seat 18, so that the The right limit seat 18 and the right button seat 15 cannot be rotated. When the button 14 is pressed, as shown in Figure 20, the four claws of the button pass through the hole on the inner wall of the right button seat 15 and push the limit slider 16 to compress the spring 17 to the depth of the cavity of the right limit seat 18, thereby disengaging The groove of the right button seat 15 is released, so that the right limit seat 18 and the right button seat 15 can rotate freely. The buckled right limit seat 18 and left limit seat 21 are respectively fixed on both ends of the U-shaped handrail tube 20 , and the right button seat 15 and the left button seat 22 are fixed on the upper ends of the two vertical pipes 11 .

The axle mechanism D is composed of two limit axles 24 , two elastic buckles 25 , two plastic axle connecting sleeves 26 and an axle tube 27 , as shown in FIG. 14 . The plastic axle connecting sleeve 26 is composed of a horizontal pipe and a vertical pipe which are perpendicular to each other. One end of the limiting wheel shaft 24 is a flange for blocking the tire 23 , and a hole for installing the elastic buckle 25 is opened on the circular surface of the other end. Insert the limiting axle 24 into the center hole of the tire 23 with the flanging facing outwards, and install the elastic buckle 25 in the tube to form a quick-release tire assembly. Then insert the quick-release tire assembly into the axle tube 27 , so that the inner side of the tire 23 bears against the end face of the transverse tube of the plastic axle connecting sleeve 26 . At this time, the snap head on the snap 25 in the tube of the limit axle 24 is just stuck into the hole on the axle tube 27, so that the limit axle 24 cannot move, so that the tire 23 on it can only rotate and cannot move axially .

The working principle of the present invention is:

When folded, hold the handle tube 13 by hand and lift it up, at this time, the right-angle curved slider 12 connected with the two ends of the handle tube 13 moves up along the riser 11, thereby driving a cross tube riveted on it. 6 also move up together. Because the right-angle curved slider 12 riveted to the other end of the cross pipe 6 is fixed on the inverted U-shaped pallet connecting pipe 9; 8 is fixed on the riser 11 and sliding on the inverted U-shaped pallet connecting pipe 9. At this time, the straight sliding block 8 riveted by the other cross pipe 6 also moves upward, thereby pulling the inverted U-shaped pallet connecting pipe 9 to approach the stand pipe 11 until it stops when it collides. At this time, the folding mechanism B is completed, as shown in Figure 3. Lift the bottom frame 3 upward, so that the L-shaped iron sheet 1 fixed on it rotates around the rivet shaft riveted to the inverted U-shaped pallet connecting pipe 9, thereby driving the fixed parts on it to rotate together, so that the bottom frame 3 is parallel to the The inverted U-shaped pallet connection pipe 9 completes the folding of the pallet mechanism A, as shown in FIG. 4 . Press the left and right buttons 14 with both hands at the same time, so that it pushes the limit slider 16 in the right button base 15 and the left button base 22 to move inward, thereby compressing the spring 17, so that the limit slider 16 slides into the right button along the wave-shaped groove. In the limit seat 18 and the left limit seat 21 , the wavy grooves in the right button seat 15 and the left button seat 22 are released from the lock. At the same time, press down the handrail tube 20, rotate it to the lowest point, release the button 14 to restore the locked state, and complete the folding of the handrail, as shown in Figure 4. If necessary, you can press the snap head on the axle tube 27 to retract the snap 25 into the limit axle 24, and pull the tire 23 outward to drive the limit axle 24 and the snap 25 together from the axle tube. 27 inside out, reducing the placement space.

When opening, hold the handle tube 13 with your hand and press down, so that the right-angle curved slider 12 connected at both ends moves down along the riser 11 together, and drives the cross tube to open outward to push the inverted U-shaped pallet. The connecting pipe 9 is moved outward in translation, so that the supporting plate mechanism A on it moves together, and stops when it reaches the limit sleeve 7, as shown in Figure 2. Pull down the bottom frame 3, and the supporting plate mechanism A rotates to a vertical position with the inverted U-shaped supporting plate connecting pipe 9, so that the two ends of the U-shaped bottom frame 3 cannot be placed on the arc surface of the inverted U-shaped supporting plate connecting pipe 9. Continue to rotate, see Figure 2. Press down the left and right buttons 14 at the same time, and turn the handrail tube 20, rotate it to the desired position, release the button 14 to restore the locked state, and complete the angle adjustment of the handrail, as shown in Figure 2.

Claims (8)

1. a multifunctional folding cart, characterized in that: the cart comprises: A frame, which consists of a front wall, two side walls and a rear wall; the front wall and the rear wall are composed of a frame composed of connecting rods, and the two side walls are composed of scissor-type connecting rod assemblies; two The lower ends of the scissor-type link assemblies of the side walls are respectively connected to the lower parts of the frames of the front and rear walls, and the upper ends are respectively connected to the upper parts of the frames of the front and rear walls. The upper end of the rod assembly slides along the frame of the front wall and the rear wall, thereby narrowing and spreading the distance between the front wall and the rear wall; A reversible pallet mechanism, which is connected to the lower part of the front side of the front wall frame, and uses the front wall frame to limit the turning angle; A cart mechanism with an adjustable angle, which is connected to the upper part of the rear side of the rear wall frame; and an axle mechanism on the lower part of the rear side of the rear wall frame, on both sides of the axle mechanism, two tires that can be quickly installed and removed are respectively installed ; A flexible liner is secured to the frame and forms an open-top interior cargo bed within the cart frame when the cart is in the deployed state, with a flat plate placed on the bottom of the cargo bed. 2 . The multifunctional folding trolley according to claim 1 , wherein the front wall is firmly connected by rods to form a rectangular frame structure. 3 . 3. The multifunctional folding trolley according to claim 1 or 2, wherein the rear wall is firmly connected by rods to form an H-shaped frame structure. 4. The multifunctional folding trolley according to claim 1 or 2, wherein the scissor-type connecting rod assembly of the side wall is composed of a set of crossed X-shaped rods, and the The lower end is connected to the lower part of the front wall frame, the upper end is connected to the upper part of the rear wall frame, the lower end of the other rod is connected to the lower part of the rear wall frame, and the upper end is connected to the upper part of the front wall frame; the scissors of the two side walls when the frame is folded and unfolded The upper end of the connecting rod assembly slides up and down along the frame of the front and rear walls. 5. The multifunctional folding trolley according to claim 1 or 2, characterized in that: the supporting plate mechanism is laid on the rod system by a flat plate, is connected to the lower part of the front side of the front wall frame by hinges, and can be turned over to Parallel and perpendicular to the front wall frame. 6. The multifunctional folding trolley according to claim 1 or 2, wherein the trolley mechanism is formed by connecting a rotary locking mechanism fixed on the upper part of the rear side of the rear wall frame and a handrail pipe, the rotary lock The stop mechanism is to connect and disconnect the two limit seats by pushing the limit sliders in the two limit seats to lock and release the rotation. 7. The multifunctional folding trolley according to claim 1 or 2, wherein the axle mechanism is composed of an axle tube fixed on the lower part of the rear side of the rear wall frame and a limit axle inserted into the axle tube and sleeved with tires ; The wheel axle realizes the quick loading and unloading of the tire through the retractable boss entering and exiting the hole on the wheel axle tube. 8. The multifunctional folding trolley according to claim 1 or 2, wherein the flat plate at the bottom of the cargo box can be separated from the cargo box, and the size is the same as that of the bottom of the cargo box.

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