CN105292350B - foldable stroller - Google Patents

Abstract

The present invention discloses a folding cart, comprising 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 pivotally connected to the rear end of the lower frame, the front wheel folding device is pivotally connected to the front end of the lower frame, the rear wheel folding structure is arranged between the lower end of the upper frame and the rear wheel, the front end of the connecting rod is pivotally connected to the front wheel folding device, and the rear end of the connecting rod is pivotally connected to the upper frame; when folding, the upper frame rotates downward, and the front wheel folding device is driven by the connecting rod to move, so that the front wheel is folded inward and folded flat, and at the same time, the rear wheel is folded inward and flattened by the rear wheel folding structure. The folding cart of the present invention has the advantages of simple structure, convenient folding, and small volume after folding.

Description

foldable stroller

technical field

The invention 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.

Contents of the invention

The object of the present invention is to provide a foldable cart which is simple and convenient to fold and has a small volume after folded.

In order to achieve the above object, the folding trolley provided by the present invention includes a lower frame, an upper frame, a front wheel retractable device, a connecting rod and a rear wheel retractable structure, and the upper frame is pivotally connected to the lower frame. At the rear end, 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 is pivoted Connected to the front wheel retracting device, the rear end of the connecting rod is pivotally connected to the upper frame; when folded, the upper frame rotates downward, and the connecting rod drives the front wheel to retract. The closing device acts so that the front wheels are folded inwards and flattened, and at the same time, the rear wheels are folded inwards to be flattened by the rear wheel folding structure.

Compared with the prior art, since the present invention is provided with a front wheel retractable device at the front end of the lower frame, a rear wheel retractable structure is provided at the lower end of the upper frame, and a connecting rod is provided to make 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 is rotated and folded by the rear wheel folding structure At the same time as the rear wheels, the front wheels are folded through the front wheel retracting device, which effectively reduces the folding steps, is 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 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 two upper and lower limiting parts, and the limiting parts restrict the rotating member when the rotating member rotates relative to the fixed member, so that the rear wheel Toggle between states or 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 foldable stroller of the present invention is unfolded.

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

Fig. 3 is a structural diagram of the rear wheel of the folding stroller 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 invention 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 comprises 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 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 retractable 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 trolley 100 There are 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 all 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 the fixing member 55 are in a vertical state, the limiting portion 54a located below is abutted against the fixing member 55, and the rear wheel 7 is in a horizontal state at this time. 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 will be described in detail 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 present invention 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 is connected The lower end of the upper frame 2 and the rear wheel 7, and by setting a first The ball joint 52 and the second ball joint 53, the 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, Therefore, 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; in addition, at the front end of the lower frame 1 A front wheel retractable device 3 is provided, 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 the rear wheel 7 is folded while rotating. The wheel 6 reduces the folding steps, is 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.

The above disclosures are only preferred examples of the present invention, and of course cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the patent scope of the present invention still fall within the scope of the present invention.

Claims (9)

1. A kind of 1. Folding trolley, it is characterised in that：Including lower vehicle frame, upper frame, front wheel retracting apparatus, connecting rod and trailing wheel folding knot Structure, the upper frame are articulated in the rear end of the lower vehicle frame, and the front wheel retracting apparatus is articulated in the front end of the lower vehicle frame, institute Stating trailing wheel folding structure includes pull bar, bottom reversed from trailing wheel to the lower vehicle frame be articulated in the lower vehicle frame, the pull bar It is arranged between the lower end of the upper frame and the trailing wheel, the front end of the connecting rod is articulated in the front wheel retracting apparatus, institute The rear end for stating connecting rod is articulated in the upper frame；During folding, the upper frame rotates down, by the connecting rod drive it is described before Folding mechanism action is taken turns, so as to the inside folding of the front-wheel and be folded flat, meanwhile, pass through the pull bar of the trailing wheel folding structure The trailing wheel is driven the trailing wheel is inwardly folded flat.
2. 2. Folding trolley as claimed in claim 1, it is characterised in that：The both ends of the pull bar and the trailing wheel and described get on the bus Ball head universal is respectively equipped between frame；During folding, the upper frame rotates down, and the lower end of the upper frame passes through the ball Head gimbal drives the pull bar, so that the pull bar drives the trailing wheel to be inwardly folded flat.
3. 3. Folding trolley as claimed in claim 2, it is characterised in that：The trailing wheel is provided with tumbler, the trailing wheel with it is described Tumbler is pivotally connected, and the lower vehicle frame is fixed with fixture, and the tumbler is articulated in the fixture, and pivot joint central shaft edge folds The fore-and-aft direction of car is set.
4. 4. Folding trolley as claimed in claim 3, it is characterised in that：The tumbler has upper and lower two limiting section, the limit Position portion limits the tumbler when the tumbler rotates relative to the fixture, so that the trailing wheel is in vertical state or water Switch between level state.
5. 5. Folding trolley as claimed in claim 1, it is characterised in that：The rear end of the lower vehicle frame is provided with the first holder, institute State upper frame relatively the lower vehicle frame expansion when, first holder clamps the lower end of the upper frame.
6. 6. Folding trolley as claimed in claim 5, it is characterised in that：The rear end of the lower vehicle frame is fixed with stacker, described The upper end of stacker is pivotally connected with the upper frame, and the lower end of the stacker is provided with first holder.
7. 7. Folding trolley as claimed in claim 1, it is characterised in that：The front wheel retracting apparatus includes rotation fixed block, consolidated Dead axle, gear, fluted disc and front wheel carrier, on the axostylus axostyle of the rotation fixed block front end that is articulated in the lower vehicle frame and one end and institute Connecting rod pivot joint is stated, the gear is fixed on the axostylus axostyle, and the fixing axle is fixed on the rotation fixed block, and the fluted disc rotates Ground is socketed on the fixing axle, and the fluted disc engages with the gear, and the front wheel carrier is fixed with the fluted disc, the front-wheel Frame installs the front-wheel.
8. 8. Folding trolley as claimed in claim 1, it is characterised in that：The upper frame has the first cross bar, and described first is horizontal Bar is provided with pin joint seat, and the rear end of the pin joint seat and the connecting rod is pivotally connected.
9. 9. Folding trolley as claimed in claim 7, it is characterised in that：The lower vehicle frame has the second cross bar, and the rotation is admittedly The rear end for determining block has the second holder, and second holder is held on second cross bar.