CN205365921U - foldable stroller - Google Patents

Abstract

The utility model discloses a folding cart, which comprises a lower frame, an upper frame, a front wheel folding device, a connecting rod and a rear wheel folding structure, wherein the upper frame is pivoted at the rear end of the lower frame; when the folding bicycle is folded, the upper frame rotates downwards, the connecting rod drives the front wheel folding device to act, so that the front wheel is folded inwards and folded flat, and meanwhile, the rear wheel is folded inwards and flat through the rear wheel folding structure. The utility model discloses folding shallow has simple structure, and it is convenient to fold up, advantage that the volume is little after folding up.

Description

foldable stroller

technical field

The utility model relates to a folding cart, in particular to a folding cart capable of flattening front and rear wheels at the same time.

Background technique

Many foldable carts are of three-wheel structure, that is, they have a front wheel and two rear wheels, and the folding of the car body can be realized by arranging folding devices on the front wheels and the rear wheels; however, existing The folding structure of the stroller is basically operated independently, that is, when folding, it is necessary to operate the front wheel folding device to fold the front wheels, and then operate the rear wheel folding device to fold the rear wheels, so there are many operating steps , it is extremely inconvenient to fold.

Moreover, the folding result of the existing folding device is only to move the wheels closer to the vehicle body to reduce the volume. However, when the vehicle body is folded into a flat state, since the wheels are still in a vertical state, the volume of the whole vehicle remains the same. It looks very large, and the volume reduction after folding is not ideal.

Based on the above deficiencies, there is a need for a folding cart that is simple and convenient to fold and has a small volume after folding.

Utility model content

The purpose of the utility model is to provide a folding cart which is simple and convenient to fold and has a small volume after folding.

In order to achieve the above purpose, the folding cart provided by the utility model includes a lower frame, an upper frame, a front wheel folding device, a connecting rod and a rear wheel folding structure, and the upper frame is pivotally connected to the lower frame The rear end of the front wheel retractable device is pivotally connected to the front end of the lower frame, the rear wheel retractable structure is arranged between the lower end of the upper frame and the rear wheel, and the front end of the connecting rod It is pivotally connected to the front wheel retractable device, and the rear end of the connecting rod is pivotally connected to the upper frame; when folded, the upper frame rotates downward, and the front wheel is driven by the connecting rod The folding device operates to fold the front wheels inwards and flatten them, and at the same time, the rear wheels are folded inwards flat through the rear wheel folding structure.

Compared with the prior art, the utility model is provided with a front wheel folding device at the front end of the lower frame, and a rear wheel folding structure at the lower end of the upper frame, and by setting a connecting rod, the The front end of the connecting rod is pivotally connected to the front wheel retracting device, and the rear end of the connecting rod is pivotally connected to the upper frame, so that the upper frame rotates and is retracted by the rear wheel folding structure. While folding the rear wheels, the front wheels are folded through the front wheel retracting device, which effectively reduces the folding steps. The folding is simple and convenient, and all the wheels can be folded into a horizontal state, which greatly reduces the occupied volume. It is very convenient to carry.

Preferably, the rear wheel folding structure includes a pull rod, the rear wheel is pivoted to the bottom frame of the lower frame so as to be pivoted to the bottom of the lower frame, and the pull rod is arranged between the rear wheel and the upper frame Between the lower ends of the pull rods, ball joints are respectively provided between the two ends of the tie rods, the rear wheels and the upper frame; when folded, the upper frame rotates downward, and the upper frame The lower end of the frame drives the pull rod through the ball joint, so that the pull rod drives the rear wheel to fold inwardly. Since the rear wheel is turned over and pivotally connected to the lower frame to the bottom of the lower frame, a pull rod is provided to connect the lower end of the upper frame to the rear wheel, and , by providing ball joints respectively between the tie rod and the rear wheel and between the tie rod and the upper frame, the ball joint and the tie rod can be positioned on the upper When the lower end of the frame rotates, the inward pulling force is realized on the rear wheels, so that when the upper frame is rotated and folded, the pull rod drives the rear wheels to be folded inwards to realize the folding of the rear wheels. The folding structure is very simple and the folding is convenient.

Preferably, the rear wheel is provided with a rotating member, the rear wheel is pivotally connected to the rotating member, the lower frame is fixed with a fixing member, the rotating member is pivotally connected to the fixing member, and the pivoting center The shaft is arranged along the front-rear direction of the folding cart. By arranging the rotating member and the fixing member, the rear wheel can be pivotally connected to the lower frame so as to turn over to the bottom of the lower frame.

Specifically, the rotating member has an upper and a lower limiting portion, and the limiting portion restricts the rotating member when the rotating member rotates relative to the fixed member, so that the rear wheel is in a vertical state or Toggle between horizontal states. By arranging the limiting part, the rear wheel can quickly realize the conversion between two different states, the structure is simple, and the accuracy of the conversion can be ensured.

Preferably, the rear end of the lower frame is provided with a first clamping piece, and when the upper frame is unfolded relative to the lower frame, the first clamping piece clamps the lower end of the upper frame .

Specifically, the rear end of the lower frame is fixed with a receiving seat, the upper end of the receiving seat is pivotally connected with the upper frame, and the lower end of the receiving seat is provided with the first clamping member.

Preferably, the front wheel retracting device includes a rotating fixed block, a fixed shaft, a gear, a chainring and a front wheel frame, and the rotating fixed block is pivotally connected to the shaft rod at the front end of the lower frame, and one end is connected to The connecting rod is pivotally connected, the gear is fixed on the shaft, the fixed shaft is fixed on the rotating fixed block, the toothed disc is rotatably sleeved on the fixed shaft, and the toothed disc is connected to the fixed shaft. The gear is meshed, the front wheel frame is fixed with the chainring, and the front wheel frame is installed with the front wheel.

Preferably, the upper frame has a first cross bar, and a pivot seat is provided on the first cross bar, and the pivot seat is pivotally connected to the rear end of the connecting rod.

Specifically, the lower frame has a second cross bar, the rear end of the rotating fixed block has a second clamping piece, and the second clamping piece is clamped on the second cross bar.

Description of drawings

Fig. 1 is a state diagram when the folding cart of the present invention is unfolded.

Fig. 2 is a top structural view of the folding cart of the present invention.

Fig. 3 is a structural diagram of the rear wheel of the folding cart of the present invention.

Fig. 4 is an enlarged view of part A in Fig. 3 .

Fig. 5 is an enlarged view of part B in Fig. 2 .

Fig. 6 is a state view of the folding cart of the present invention when it is fully folded.

detailed description

In order to describe the technical content, structural features, and achieved effects of the present utility model in detail, the following will be described in detail in conjunction with the embodiments and accompanying drawings.

As shown in Fig. 1 and Fig. 2, the folding cart 100 of the present invention includes a lower frame 1, an upper frame 2, a front wheel folding device 3, a connecting rod 4 and a rear wheel folding structure 5, and the upper cart The frame 2 is pivotally connected to the rear end of the lower frame 1, the front wheel retracting device 3 is pivotally connected to the front end of the lower frame 1, and the front end of the connecting rod 4 is pivotally connected to the front wheel retractor. Closing device 3, the rear end of the connecting rod 4 is pivotally connected to the upper frame 2; the rear wheel folding structure 5 is arranged between the rear wheel 7 and the upper frame 2, and the folding cart 100 has two rear wheels 7, so two sets of rear wheel folding structures 5 are used, and the lower end of the upper frame 2 is extended to two ends of the rear wheel folding structures 5, so that the The upper frame 2 controls the two rear wheel folding structures 5 at the same time; when folding, the upper frame 2 rotates downward, and the connecting rod 4 drives the front wheel retracting device 3 to move, so that The front wheels 6 are folded inward and flattened, and at the same time, the two rear wheels 7 are folded inward by the two rear wheel folding structures 5 .

As shown in Figure 3 and Figure 4 again, specifically, the rear wheel folding structure 5 includes a pull rod 51, and the pull rod 51 is arranged between the rear wheel 7 and the lower end of the upper frame 2, the A first ball joint 52 is provided between one end of the pull rod 51 and the rear wheel 7, and the rear wheel 7 is provided with a rotating member 54, and the rear wheel 7 is pivotally connected to the rotating member 54. One end of the first ball joint 52 is connected with the rotating member 54, and the other end of the first ball joint 52 is connected with one end of the pull rod 51; the other end of the pull rod 51 is connected with the A second ball joint 53 is arranged between the upper frame 2, and the other end of the pull rod 51 is connected to one end of the second ball joint 53, and the second ball joint 53 The other end is connected with the lower end of the lower frame 1 . The lower frame 1 is fixed with a fixing member 55, the rotating member 54 is pivotally connected to the fixing member 55, and the central axis of the pivoting connection is arranged along the front-rear direction of the folding bike. By arranging the rotating member 54 and the fixing member 55 , the rear wheel 7 can be turned over to the bottom of the lower frame 1 and pivotally connected to the lower frame 1 . When folded, the upper frame 2 rotates downward, and the lower end of the upper frame 2 drives the pull rod 51 through the second ball joint 53, so that the pull rod 51 drives the rear wheel 7 Fold inwards flat.

Referring to Fig. 4 again, the rotating member 54 has two upper and lower limiting portions 54a, and the limiting portion 54a restricts the rotating member 54 when the rotating member 54 rotates relative to the fixing member 55; When the rotating member 54 and the fixing member 55 are left and right, the upper limit portion 54a abuts against the fixing member 55, and the rear wheel 7 is in a vertical state; when the rotating member 54 and When the fixing member 55 is up and down, the lower limiting portion 54a abuts against the fixing member 55, and the rear wheel 7 is in a horizontal state. By setting the limiting portion 54a, the rear wheel 7 can be quickly switched between two different states, the structure is simple, and the switching accuracy is ensured.

Referring to Fig. 4 again, the rear end of the lower frame 1 is fixed with a receiving seat 11, the upper end of the receiving seat 11 is pivotally connected with the upper frame 2, the pivot point is a, the lower end of the receiving seat 11 The first clamping part 11a is provided, and when the upper frame 2 is unfolded relative to the lower frame 1, the first clamping part 11a clamps the lower end of the upper frame 2.

As shown in Fig. 2 and Fig. 5, the front wheel retracting device 3 includes a rotating fixed block 31, a fixed shaft 32, a gear 33, a gear plate 34 and a front wheel frame 35, and the rotating fixed block 31 is pivotally connected to the lower On the shaft 12 at the front end of the vehicle frame 1 and one end of the rotation fixing block 31 is pivotally connected with the connecting rod 4, the gear 33 is fixed on the shaft 12, the fixed shaft 32 is fixed on the rotation fixing Block 31, the fixed shaft 32 is perpendicular to the shaft rod 12, the toothed disc 34 is rotatably sleeved on the fixed shaft 32, the disc surface of the toothed disc 34 is perpendicular to the plane of the gear 33, so that the The toothed plate 34 is meshed with the gear 33 , the front wheel frame 35 is fixed with the toothed plate 34 , and the front wheel 6 is mounted on the front wheel frame 35 .

Referring to Fig. 2 and Fig. 5 again, the upper frame 2 has a first cross bar 21, the first cross bar 21 is located above the pivot point a, and the first cross bar 21 is provided with a pivot joint. Seat 22, the pivotal seat 22 is pivotally connected to the rear end of the connecting rod 4. The lower frame 1 has a second crossbar 13 , and the rear end of the rotating fixed block 31 has a second clamping part 31 a, and the second clamping part 31 a is clamped on the second crossbar 13 .

Based on the above and in conjunction with Fig. 6, the folding principle of the folding cart 100 of the present invention is described in detail below, as follows:

When folded, the upper frame 2 is turned downward, and the upper frame 2 moves closer to the lower frame 1. At this time, the first cross bar 21 pushes the connecting rod 4, so that the connecting rod 2 Rod 4 moves forward, and described connecting rod 4 drives described rotating fixed block 31, makes described rotating fixed block 31 rotate around described shaft rod 12, thereby makes described front wheel frame 35 and front wheel 6 to described downward The lower bottom surface of the vehicle frame 1 is overturned, and at the same time, the toothed disc 34 drives the front wheel frame 35 and the front wheel 6 to rotate around the fixed shaft 32 under the drive of the gear 33; When the front wheel 6 is completely overturned under the lower frame 1, the front wheel 6 turns 90 degrees, and converts from a vertical state to a substantially horizontal state. In addition, when the upper frame 2 rotates downward, the lower end of the upper frame 2 rotates upward. At this time, the lower end of the upper frame 2 passes through the second ball joint 53 and the pull rod 51 And the first ball joint 52 drives the rotating member 54, and the rotating member 54 rotates to the bottom of the fixing member 55, thereby turning the rear wheel 7 from the vertical state to the bottom frame 1 Fold the lower bottom flat, that is, fold it into a roughly horizontal state. When the folding cart 100 is fully folded, the front wheel 6 and the two rear wheels 7 are located at the lower bottom of the lower frame 1 and are in a horizontal state.

Compared with the prior art, since the utility model turns the rear wheel 7 to the bottom of the lower frame 1 and is pivotally connected to the lower frame 1, by setting a pull rod 51, the pull rod 51 The lower end of the upper frame 2 and the rear wheel 7 are connected, and a second A ball joint 52 and a second ball joint 53, two ball joints and the pull rod 51 can realize the inward pulling force on the rear wheel 7 when the lower end of the upper frame 2 rotates , so that when the upper frame 2 is rotated and folded, the pull rod 51 drives the rear wheel 7 to be flattened inwardly, so as to realize the folding of the rear wheel 7; A front wheel retractable device 3 is provided at the front end, and the upper frame 2 is connected with the front wheel retractable device 3 through a connecting rod 4, so that the upper frame 2 is folded while rotating and folding the rear wheels 7 The front wheels 6 reduce the steps of folding, are simple and convenient to fold, and can make all the wheels fold into a horizontal state, which greatly reduces the occupied volume and makes it very convenient to carry.

What is disclosed above is only a preferred example of the utility model, and of course the scope of rights of the utility model cannot be limited with this. Therefore, equivalent changes made according to the patent scope of the utility model still belong to the scope covered by the utility model .

Claims (9)

1. a Folding trolley, it is characterized in that: include lower vehicle frame, upper frame, front wheel retracting apparatus, connecting rod and trailing wheel folding structure, described upper frame is articulated in the rear end of described lower vehicle frame, described front wheel retracting apparatus is articulated in the front end of described lower vehicle frame, described trailing wheel folding structure is arranged between lower end and the trailing wheel of described upper frame, the front end of described connecting rod is articulated in described front wheel retracting apparatus, and the rear end of described connecting rod is articulated in described upper frame；During folding, described upper frame rotates down, and drives described front wheel retracting apparatus action by described connecting rod, so that the inside folding of described front-wheel being folded flat, meanwhile, makes described trailing wheel inwardly be folded flat by described trailing wheel folding structure.

2. Folding trolley as claimed in claim 1, it is characterized in that: described trailing wheel folding structure includes pull bar, trailing wheel is articulated in described lower vehicle frame to the bottom reversed of described lower vehicle frame, described pull bar is arranged between the lower end of described trailing wheel and described upper frame, is respectively equipped with ball head universal between the two ends of described pull bar and described trailing wheel and described upper frame；During folding, described upper frame rotates down, and the lower end of described upper frame drives described pull bar by described ball head universal, so that described pull bar drives described trailing wheel to be inwardly folded flat.

3. Folding trolley as claimed in claim 2, it is characterized in that: described trailing wheel is provided with tumbler, described trailing wheel and described tumbler pivot joint, and described lower vehicle frame is fixed with fixture, described tumbler is articulated in described fixture, and pivot joint central shaft is arranged along the fore-and-aft direction of folded bicycle.

4. Folding trolley as claimed in claim 3, it is characterized in that: described tumbler has upper and lower two limiting sections, described limiting section rotates tumbler described in limit at described tumbler relative to described fixture, so that described trailing wheel switches between vertical state or level.

5. Folding trolley as claimed in claim 1, it is characterised in that: the rear end of described lower vehicle frame is provided with the first holder, and when the relatively described lower vehicle frame of described upper frame launches, described first holder clamps the lower end of described upper frame.

6. Folding trolley as claimed in claim 5, it is characterised in that: the rear end of described lower vehicle frame is fixed with stacker, the upper end of described stacker and described upper frame pivot joint, and the lower end of described stacker is provided with described first holder.

7. Folding trolley as claimed in claim 1, it is characterized in that: described front wheel retracting apparatus includes rotating fixed block, fixing axle, gear, fluted disc and front wheel carrier, described rotation fixed block is articulated on the axostylus axostyle of the front end of described lower vehicle frame and one end and described connecting rod pivot joint, described gear is fixed on described axostylus axostyle, described fixing axle is fixed on described rotation fixed block, described fluted disc is socketed on described fixing axle rotationally, and described fluted disc engages with described gear, described front wheel carrier and described fluted disc are fixed, and described front wheel carrier installs described front-wheel.

8. Folding trolley as claimed in claim 1, it is characterised in that: described upper frame has the first cross bar, and described first cross bar is provided with the rear end pivot joint of pin joint seat, described pin joint seat and described connecting rod.

9. Folding trolley as claimed in claim 7, it is characterised in that: described lower vehicle frame has the second cross bar, and the rear end of described rotation fixed block has the second holder, and described second holder is held on described second cross bar.