Folding type multifunctional baby stroller

Abstract

According to the folding type multifunctional baby stroller, a locking mechanism is arranged at the joint of an upper front beam, an upper rear beam and a stand column of a side frame, a main body frame can be kept in an unfolded state, when a stroller body is subjected to reverse acting force opposite to thrust in the pushing process, the main body frame cannot be folded abnormally, and the structure is stable. Moreover, in the locking state, the main body frame can be converted from the unfolded state to the folded state only by pulling the switch plate upwards and then lifting the locking mechanism upwards, and on the contrary, the main body frame can be converted from the folded state to the unfolded state by pulling the switch plate upwards and then pressing the locking mechanism downwards. And after the unfolding state and the folding state are switched, additional operation is not needed, and the locking mechanism can automatically enter the locking state, so that the folding operation and the unfolding operation of the main body frame are simple.

Description

Technical Field

[0001] The utility model relates to the field of strollers for children, in particular to a foldable multifunctional stroller for babies. Background Art

[0002] The main frame of a foldable multifunctional baby stroller is a rectangular frame, and the middle position of the main frame can be raised relative to the front and rear ends to make the main frame folded, such as the stroller disclosed in the patent document US16322153B2. This type of stroller has a larger storage space than an ordinary baby stroller. It can be used as a stroller to carry 1-4 babies out, and can also be used as a platform for babies to play. It occupies a small space after folding, which is convenient for transportation and storage. In the process of pushing this type of vehicle forward, when the front end of the vehicle body or the front wheel is obstructed, the main frame is subjected to a reverse force opposite to the thrust. The reverse force and the thrust act together on the main frame, causing the main frame to fold abnormally, so there is a defect of poor stability.

[0003] In view of the above-mentioned defects in the prior art, this application is proposed. Utility Model Content

[0004] The utility model aims to provide a foldable multifunctional baby stroller, which can be locked in an unfolded state or a folded state, so that the body structure is stable and reliable, the unfolding operation and the folding operation are simple and the automatic locking function can be realized.

[0005] To achieve the above-mentioned purpose, the utility model provides a foldable multifunctional baby stroller comprising a foldable main frame and a wheel assembly;

[0006] Includes a foldable main frame and wheel assembly;

[0007] The main frame includes a front frame, a rear frame and a side frame;

[0008] The side frame includes a column, an upper front beam and a lower front beam connecting the column and the front frame, an upper rear beam and a lower rear beam connecting the column and the rear frame, and a locking mechanism corresponding to the joint of the upper front beam, the upper rear beam and the column;

[0009] The locking mechanism comprises a base plate, a movable pin and a switch plate, and the base plate is fixedly connected to the upper end of the column.

[0010] The base plate is provided with a fixing pin, and the upper front beam and the upper rear beam are rotatably connected to the fixing pin.

[0011] The base plate is provided with a first long hole below the fixing pin, and the long side of the first long hole extends up and down. The upper front beam and the upper rear beam are provided with a second long hole corresponding to the first long hole. The second long hole includes an arc segment, a first straight segment and a second straight segment. The first straight segment is located at one end of the arc segment, and when the main frame is in an unfolded state, the first straight segment is aligned with the first long hole. The second straight segment is located at the other end of the arc segment, and when the main frame is in a folded state, the second straight segment is aligned with the first long hole.

[0012] The movable pin passes through the first long hole and the second long hole,

[0013] The switch plate is fixedly connected to the movable pin, and the switch plate is used to manipulate the movable pin to move upward, switching from the first straight line segment or the second straight line segment of the second long hole to the entrance of the arc segment of the second long hole.

[0014] A first spring is arranged between the switch plate and the base plate, and the first spring provides an elastic force to push the switch plate downward.

[0015] In one embodiment, the base plate includes two fixing pins, which are spaced apart in the front-to-back direction, the upper front beam is rotatably connected to one of the two fixing pins, and the upper rear beam is rotatably connected to the other of the two fixing pins.

[0016] In one embodiment, a first gap is formed between the upper front beam and the upper rear beam in the left-right direction, and the locking mechanism includes a partition plate, which is arranged in the first gap to separate the upper front beam and the upper rear beam and guide the upper front beam and the upper rear beam to rotate.

[0017] In one embodiment, the base plate includes a left plate body and a right plate body that are arranged opposite to each other, and an upper plate body that connects the left plate body and the right plate body into one from the top, and the upper front beam, the upper rear beam and the partition are arranged between the left plate body and the right plate body.

[0018] In one embodiment, the arc length of the arc segment of the second long hole is L / 4, where L is the circumference of a circle with the fixing pin as the center and the distance from the fixing pin to the intersection of the arc segment of the second long hole and the first straight line segment as the radius.

[0019] In one embodiment, a connecting plate is connected to the lower end of the column, and the connecting plate includes two meshing synchronous gears, one of the two synchronous gears is fixedly connected to the lower front beam, and the other of the two synchronous gears is fixedly connected to the lower rear beam.

[0020] In one embodiment, a decorative cover is provided on the outer sides of the connecting plate and the synchronous gear.

[0021] In one embodiment, the locking mechanism comprises a decorative cover, a side surface of the decorative cover is provided with a hole, and the switch plate is exposed from the hole.

[0022] In one embodiment, the upper front beam and the upper rear beam include a steel plate and a decorative tube sleeved outside the steel plate.

[0023] In one embodiment, the wheel assembly includes two steering wheels, the front frame includes a front left vertical frame and a front right vertical frame, one of the two steering wheels is connected to the lower end of the front left vertical frame, and the other of the two steering wheels is connected to the lower end of the front right vertical frame.

[0024] In one embodiment, the steering wheel includes a wheel bracket and a first shaft head, the first shaft head is used to connect the front left vertical frame or the front right vertical frame, wherein a downwardly recessed annular groove is provided at the top of the wheel bracket, the center line of the annular groove coincides with the center line of the first shaft head, a damping plate is movably installed in the annular groove, a second spring is provided between the damping plate and the bottom of the annular groove, the top of the damping plate protrudes from the top of the wheel bracket, and contacts and cooperates with the bottom surface of the front left vertical frame or the front right vertical frame.

[0025] In one embodiment, the damping plate includes a rigid ring and a flexible ring, the rigid ring and the flexible ring are arranged in a superimposed manner, the rigid ring is located below the flexible ring, the rigid ring includes a connecting foot, the second spring is a coil spring, and the connecting foot extends into the coil spring.

[0026] In one embodiment, the number of the second springs is at least two, and all the second springs are evenly distributed in the annular groove around the first shaft head.

[0027] In one embodiment, the wheel assembly includes an axle and two rear wheels, the middle portion of the axle is fixedly connected to a brake pedal, the two ends of the axle are fixedly connected to two shock-absorbing brackets, a plug-in portion is provided at the top of the shock-absorbing bracket, the rear frame is detachably connected to the plug-in portion, and the rear wheel includes a second axle head, which passes through the shock-absorbing bracket and is fixedly connected to the axle.

[0028] In one embodiment, the axle includes an inner shaft tube and an outer tube which are sleeved together, a center line of the inner shaft tube coincides with a center line of the outer tube, and a second gap is provided between the outer tube and the inner shaft tube.

[0029] In one embodiment, the outer tube and the inner shaft tube are aluminum alloy tubes, the outer diameter of the outer tube is 22 mm, the outer diameter of the inner shaft tube is 18 mm, the wall thickness of the inner shaft tube is 6 mm, and the second gap is 20 wires.

[0030] Compared with the prior art, the utility model has at least the following beneficial effects:

[0031] Since a locking mechanism is provided at the joint of the upper front beam, the upper rear beam and the column, the main frame can be kept in the unfolded state. When the vehicle body is subjected to a reverse force opposite to the thrust during pushing, the main frame will not be abnormally folded, so it is stable and reliable.

[0032] The main frame is locked by the same locking mechanism in both the unfolded state and the folded state.

[0033] Moreover, in the locked state, the main frame can be switched from the unfolded state to the folded state by simply pressing the switch plate upwards and then lifting the locking mechanism upwards. Conversely, the main frame can be switched from the folded state to the unfolded state by simply pressing the switch plate upwards and then pressing the locking mechanism downwards. After switching from the unfolded state to the folded state, or from the folded state to the unfolded state, no additional operation is required, and the locking mechanism will automatically enter the locked state. Therefore, the folding and unfolding operations of the main frame are simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the structure of a foldable multifunctional baby stroller according to an embodiment;

[0035] Figure 2 This is a second structural schematic diagram of a foldable multifunctional baby stroller according to an embodiment;

[0036] Figure 3 It is one of the structural schematic diagrams of the side frame;

[0037] Figure 4 This is the second structural diagram of the side frame;

[0038] Figure 5 It is one of the structural schematic diagrams of the locking mechanism;

[0039] Figure 6 This is the second structural diagram of the locking mechanism;

[0040] Figure 7 The third structural diagram of the locking mechanism;

[0041] Figure 8 The fourth structural diagram of the locking mechanism;

[0042] Fig. 9 The fifth structural diagram of the locking mechanism;

[0043] Fig.10 It is one of the states of the locking mechanism;

[0044] Fig.11 This is the second state of the locking mechanism;

[0045] Fig.12 The third state of the locking mechanism;

[0046] Fig.13 The fourth state of the locking mechanism;

[0047] Fig.14 One of the schematic diagrams of the steering wheel;

[0048] Fig.15 This is the second schematic diagram of the steering wheel;

[0049] Fig.16 for Fig.15 AA section view;

[0050] Fig.17 It is a schematic diagram of the components of the axle, shock absorber bracket and brake pedal;

[0051] Fig.18 is a schematic diagram of an axle;

[0052] Fig.19 for Fig.18 BB cross-sectional view;

[0053] Fig. 20 This is a schematic diagram of the folded state of the cart;

[0054] Reference numerals:

[0055] 100. Main frame;

[0056] 110, front frame;

[0057] 111. Front horizontal frame;

[0058] 112, front right vertical frame;

[0059] 113, front left vertical frame;

[0060] 120, side frame;

[0061] 121, upper front beam;

[0062] 1210, second long hole;

[0063] 1211, second straight line segment;

[0064] 1212, arc segment;

[0065] 1213, first straight line segment;

[0066] 122, lower front beam;

[0067] 123. Pillar;

[0068] 1231, synchronous gear;

[0069] 1232, connecting plate;

[0070] 124, lower rear beam;

[0071] 125. Locking mechanism;

[0072] 1251, activity pin;

[0073] 1252, first long hole;

[0074] 1253. Substrate;

[0075] 12531. Left plate body;

[0076] 12532. Right plate body;

[0077] 12533. Upper plate body;

[0078] 1254, fixing pin;

[0079] 1255, first spring;

[0080] 1256, guide part;

[0081] 1257, switch board;

[0082] 1258, partition;

[0083] 1259, decorative cover;

[0084] 126, upper rear beam;

[0085] 130, rear frame;

[0086] 131, rear cross frame;

[0087] 132, rear left vertical frame;

[0088] 133, rear right vertical frame;

[0089] 200, wheel assembly;

[0090] 210, steering wheel;

[0091] 211, wheel bracket;

[0092] 212, second spring;

[0093] 213, damping plate;

[0094] 2131, Rigid ring;

[0095] 2132, flexible ring;

[0096] 2133, connecting foot;

[0097] 214, first axis head;

[0098] 215, annular groove;

[0099] 220, rear wheel;

[0100] 221, second axis head;

[0101] 230, axle;

[0102] 231, foreign control;

[0103] 232, inner shaft tube;

[0104] 233, second gap;

[0105] 240, shock-absorbing bracket;

[0106] 241, plug-in unit;

[0107] 250. Brake pedal;

[0108] Y1. Circle. DETAILED DESCRIPTION

[0109] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0110] Reference Figure 1 and Figure 2 The foldable multifunctional baby stroller comprises a foldable main frame 100 and a wheel assembly 200 .

[0111] The main frame 100 includes a front frame 110 , a rear frame 130 , and two side frames 120 . The main frame 100 is substantially a rectangular parallelepiped structure.

[0112] The front frame 110 includes a front right vertical frame 112, a front left vertical frame 113 and a plurality of front horizontal frames 111. A steering wheel 210 is respectively installed at the lower end of the front right vertical frame 112 and the lower end of the front left vertical frame 113. The front frame 110 is further connected with a front handrail and a pull rod, and power for moving the cart can be applied through the front handrail or the pull rod.

[0113] The rear frame 130 includes a rear left vertical frame 132, a rear right vertical frame 133 and a plurality of rear transverse frames 131. The lower ends of the rear left vertical frame 132 and the rear right vertical frame 133 are connected to the axle 230, and the rear wheel 220 is mounted on the axle 230. The rear frame 130 is further connected to a rear handrail, through which power can be applied to move the cart.

[0114] One of the two side frames 120 is located on the left side, and the other of the two side frames 120 is located on the right side. The two side frames 120 have the same structure. The structure of the side frame 120 is described below by taking the side frame 120 on the left side as an example.

[0115] Reference Figures 3 to 13 The side frame 120 includes a column 123, an upper front beam 121, a lower front beam 122, an upper rear beam 126, a lower rear beam 124, and a locking mechanism 125. The column 123, the front left vertical frame 113, and the rear left vertical frame 132 are roughly parallel. The upper front beam 121 and the lower front beam 122 are connected between the column 123 and the front left vertical frame 113, and the upper rear beam 126 and the lower rear beam 124 are connected between the column 123 and the rear left vertical frame 132. The connections here are all rotational connections to achieve the folding of the side frame 120. Among them, refer to Figure 3 When an upward thrust is applied from the position of the column 123, the side frame 120 will be deformed and transformed from the unfolded state to the folded state. After both side frames 120 are folded, the main frame 100 enters the folded state. Fig. 20 In the folded state, when downward pressure is applied from the position of the column 123, the side frame 120 will be deformed from the folded state to the unfolded state. After both side frames 120 are unfolded, the main frame 100 enters the unfolded state. Figure 1 and Figure 2 shown.

[0116] The locking mechanism 125 is disposed at the joint of the upper front beam 121 , the upper rear beam 126 and the column 123 . The locking mechanism 125 is used to maintain an unfolded state and a folded state.

[0117] The locking mechanism 125 includes a base plate 1253 , a movable pin 1251 and a switch plate 1257 .

[0118] The base plate 1253 is fixedly connected to the upper end of the column 123, and the base plate 1253 is provided with two fixing pins 1254. The rear end of the upper front beam 121 can be rotatably connected to one of the two fixing pins 1254 on the base plate 1253, and the front end of the upper rear beam 126 can be rotatably connected to the other of the two fixing pins 1254 on the base plate 1253, thereby realizing the rotatable connection between the upper front beam 121 and the column 123, and the rotatable connection between the upper rear beam 126 and the column 123.

[0119] The base plate 1253 has first long holes 1252 below the two fixing pins 1254. The long sides of the first long holes 1252 extend up and down. The upper front beam 121 has second long holes 1210 corresponding to the first long holes 1252. The upper rear beam 126 also has second long holes 1210 corresponding to the first long holes 1252.

[0120] The second long hole 1210 includes an arc segment 1212 , a first straight segment 1213 and a second straight segment 1211 .

[0121] The first straight line segment 1213 is located at one end of the arc segment 1212 , and when the main frame 100 is in the unfolded state, the first straight line segment 1213 is aligned with the first long hole 1252 .

[0122] The second straight line segment 1211 is located at the other end of the arc segment 1212 , and when the main frame 100 is in the folded state, the second straight line segment 1211 is aligned with the first long hole 1252 .

[0123] The movable pin 1251 passes through the first long hole 1252 and the second long hole 1210 .

[0124] The switch plate 1257 is fixedly connected to the movable pin 1251, and the switch plate 1257 is used to manipulate the movable pin 1251 to move upward, switching from the first straight segment 1213 of the second long hole 1210 to the entrance of the arc segment 1212 of the second long hole 1210, or, switching from the second straight segment 1211 of the second long hole 1210 to the entrance of the arc segment 1212 of the second long hole 1210.

[0125] A first spring 1255 is provided between the switch plate 1257 and the base plate 1253 , and the first spring 1255 provides an elastic force for returning the switch plate 1257 and the movable pin 1251 downward.

[0126] A guide portion 1256 extending up and down is further provided on the base plate 1253, and the switch plate 1257 is slidably engaged with the guide portion 1256, and the guide portion 1256 serves to guide the switch plate 1257 to move upward or downward.

[0127] The following combination Figures 10 to 13 The working principle of the locking mechanism 125 will be described.

[0128] In this embodiment, the folding of the main frame 100 is achieved by folding the side frame 120, so the state of the main frame 100 corresponds to the state of the side frame 120, that is: when the side frame is in the unfolded state, the main frame is also in the unfolded state, and when the side frame is in the folded state, the main frame is also in the folded state.

[0129] Fig.10 The middle side frame 120 is in the unfolded state. Fig.10As shown, in the deployed state, the first straight section 1213 of the second long hole is aligned with the first long hole 1252, and under the elastic force of the first spring 1255, the movable pin 1251 is at the lower end of the first straight section 1213 of the second long hole and the first long hole 1252. At this time, the locking mechanism 125 is in a locked state, and the movable pin 1251 cooperates with the first straight section 1213 of the second long hole to produce a limiting function, so that the upper front beam 121 and the upper rear beam 126 cannot rotate relative to the column 123, thereby keeping the side frame 120 in the deployed state.

[0130] In the unfolded state, when unlocking is desired, the switch plate 1257 is pressed upward to overcome the elastic force of the first spring 1255, and the switch plate 1257 drives the movable pin 1251 to move upward, switching the movable pin 1251 from the first straight section 1213 of the second long hole 1210 to the entrance of the arc section 1212 of the second long hole 1210, such as Fig.11 As shown, at this time, the locking mechanism 125 enters the unlocking state, and the upper front beam 121 and the upper rear beam 126 can rotate relative to the column 123 around the fixing pin 1254.

[0131] exist Fig.11 In the unlocked state shown in FIG. 1 , when an upward lifting force is applied from the locking mechanism 125, the lifting force causes the upper front beam 121 and the upper rear beam 126 to rotate around the fixed pin 1254, and the arc segment 1212 of the second long hole 1210 slides along the movable pin 1251. When the end of the arc segment 1212 contacts the movable pin 1251, the rotation of the upper front beam 121 and the upper rear beam 126 is terminated, and the side frame 120 enters the folded state. At this time, the positions of the upper front beam 121 and the upper rear beam 126 are as shown in FIG. Fig.12 As shown by the dotted line in , the second straight line segment 1211 is aligned with the first long hole 1252.

[0132] Enter Fig.12 After the state shown, the elastic force of the first spring 1255 causes the movable pin 1251 to move downward and return to the lower end of the first long hole 1252 and the second straight line segment 1211 of the second long hole 1210, as shown in FIG. Fig.13 At this time, the locking mechanism 125 enters the locking state, and the movable pin 1251 cooperates with the second straight section 1211 of the second long hole to produce a limiting function, so that the upper front beam 121 and the upper rear beam 126 cannot rotate relative to the column 123, thereby keeping the side frame 120 in the folded state.

[0133] Fig.13 The dotted lines in the figure show the state of the upper front beam 121 and the upper rear beam 126 when locked in the folded state, as well as the relative positional relationship among the movable pin 1251, the first long hole 1252, and the second straight line segment 1211 of the second long hole.

[0134] exist Fig.13In the folded state shown in the figure, when unlocking, the elastic force of the first spring 1255 is overcome to push the switch plate 1257 upward, and the switch plate 1257 drives the movable pin 1251 to move upward, and the movable pin 1251 is switched from the second straight line segment 1211 of the second long hole 1210 to the entrance of the arc segment 1212 of the second long hole 1210, that is, the movable pin 1251 is switched from the second straight line segment 1211 of the second long hole 1210 to the entrance of the arc segment 1212 of the second long hole 1210. Fig.13 Switch to the position in Fig.12 At this time, the locking mechanism 125 enters the unlocked state, and the upper front beam 121 and the upper rear beam 126 can rotate relative to the column 123 around the fixing pin 1254.

[0135] After entering the unlocked state, downward pressure is applied from the locking mechanism 125, and the pressure causes the upper front beam 121 and the upper rear beam 126 to rotate relative to the column 123 around the fixed pin 1254, and the arc segment 1212 of the second long hole 1210 slides along the movable pin 1251. When the end of the arc segment 1212 contacts the movable pin 1251, the rotation of the upper front beam 121 and the upper rear beam 126 is terminated, and the side frame 120 enters the unfolded state. At this time, the positions of the upper front beam 121 and the upper rear beam 126 are as shown in FIG. Fig.12 As shown by the solid line in Fig.11 As shown, the first straight line segment 1213 is aligned with the first long hole 1252 .

[0136] Enter Fig.11 After the state shown, the elastic force of the first spring 1255 causes the movable pin 1251 to move downward and return to the lower end of the first long hole 1252 and the first straight line segment 1213 of the second long hole 1210, as shown in FIG. Fig.10 At this time, the locking mechanism 125 enters the locking state, and the movable pin 1251 cooperates with the first straight section 1213 of the second long hole to produce a limiting function, so that the upper front beam 121 and the upper rear beam 126 cannot rotate relative to the column 123, thereby keeping the side frame 120 in the unfolded state.

[0137] In the above embodiment, since a locking mechanism 125 is provided at the joint of the upper front beam 121, the upper rear beam 126 and the column 123, the main frame 100 can be kept in the unfolded state. When the vehicle body is subjected to a reverse force opposite to the thrust during pushing, the locking mechanism 125 prevents the upper front beam 121 and the upper rear beam 126 from rotating relative to the column 123, so that the main frame 100 will not be abnormally folded, and is therefore stable and reliable.

[0138] The main frame 100 of the cart is locked by the same locking mechanism 125 in both the unfolded state and the folded state.

[0139] Moreover, in the locked state, the main frame 100 can be switched from the unfolded state to the folded state by simply pressing the switch plate 1257 upwards and then lifting the locking mechanism 125 upwards. Conversely, the main frame 100 can be switched from the folded state to the unfolded state by simply pressing the switch plate 1257 upwards and then pressing the locking mechanism 125 downwards. After switching from the unfolded state to the folded state, or from the folded state to the unfolded state, no additional operation is required, and the locking mechanism 125 will automatically enter the locked state under the elastic force of the first spring 1255. Therefore, the folding and unfolding operations of the main frame 100 are simple and convenient.

[0140] Reference Figure 8 and Fig. 9 In the left-right direction, a first gap is formed between the upper front beam 121 and the upper rear beam 126. The locking mechanism 125 further includes a partition 1258, which is disposed in the first gap. The partition 1258 serves to separate the upper front beam 121 and the upper rear beam 126, and to guide the rotation of the upper front beam 121 and the upper rear beam 126. In this embodiment, the partition 1258 is provided to prevent the upper front beam 121 and the upper rear beam 126 from interfering with each other, thereby preventing the occurrence of unsmoothness during the unfolding or folding process.

[0141] Continue to refer to Fig. 9 The base plate 1253 includes a left plate body 12531 and a right plate body 12532 which are arranged opposite to each other, and an upper plate body 12533 ​​which connects the left plate body 12531 and the right plate body 12532 into one body from the upper part, and an upper front beam 121, an upper rear beam 126 and a partition plate 1258 are arranged between the left plate body 12531 and the right plate body 12532. In this embodiment, the above structure of the base plate 1253 enables the base plate 1253 to limit the upper front beam 121 and the upper rear beam 126 in the left and right directions, thereby preventing displacement in the left and right directions.

[0142] Reference Figure 4 , the arc length of the arc segment 1212 of the second long hole 1210 is L / 4, where L is the circumference of the circle Y1, the circle Y1 takes the fixing pin 1254 as the center, and the distance from the fixing pin 1254 to the intersection of the arc segment 1212 of the second long hole 1210 and the first straight line segment 1213 as the radius. In this embodiment, the folding angle of the upper front beam 121 and the column 123, and the folding angle of the upper rear beam 126 and the column 123 are about 90 degrees, and the state of the cart after folding is as follows Fig. 20 As shown, it can be seen that, compared with the unfolded state, the dimension of the cart in the front-to-back direction is greatly reduced after folding, which will facilitate the transportation and storage of the cart.

[0143] Continue to refer to Figure 4The lower end of the column 123 is connected to a connecting plate 1232, and the connecting plate 1232 includes two meshing synchronous gears 1231, one of the two synchronous gears 1231 is fixedly connected to the lower front beam 122, and the other of the two synchronous gears 1231 is fixedly connected to the lower rear beam 124. In this embodiment, the two synchronous gears 1231 will produce a certain damping effect during the above-mentioned unfolding process or folding process to avoid abrupt unfolding or folding operations.

[0144] Combination Figure 1 and Figure 4 The connecting plate 1232 and the synchronous gear 1231 are provided with a decorative cover for decoration and protection.

[0145] Reference Figure 3 The locking mechanism 125 includes a decorative cover 1259, a hole is opened on the side of the decorative cover 1259, and the switch plate 1257 is exposed from the hole. The outer surface of the protective cover 1259 is smooth and has no edges and corners, and will not cause harm to the baby during use. The decorative cover 1259 can play a decorative and protective role.

[0146] The upper front beam 121 and the upper rear beam 126 include a steel plate and a decorative tube, and the decorative tube is sleeved outside the steel plate. The decorative tube can be made of plastic material, for example. Compared with plastic, the steel plate has better strength. The upper front beam 121 and the upper rear beam 126, which are constructed by combining the steel plate and the decorative tube, have both load-bearing and decorative effects.

[0147] In the above embodiment, the base plate 1253 includes two fixing pins 1254, the two fixing pins 1254 are spaced apart in the front-to-back direction, the upper front beam 121 is rotatably connected to one of the two fixing pins 1254, and the upper rear beam 126 is rotatably connected to the other of the two fixing pins 1254. The two fixing pins 1254 each correspond to a movable pin 1251 and a first long hole 1252.

[0148] As another embodiment, the number of the fixing pin 1254 on the base plate 1253 is one. Accordingly, the number of the first long hole 1252 and the number of the movable pin 1251 are both one. The rear end of the upper front beam 121 and the front end of the upper rear beam 126 are both rotatably connected to the fixing pin 1254. The second long hole 1210 of the upper front beam 121 and the second long hole 1210 of the upper rear beam 126 are both matched with the movable pin 1251.

[0149] Reference Figure 1 , Figure 2 In the above embodiment, the upper front beam 121 and the upper rear beam 126 have the function of guardrails to prevent the baby from accidentally falling out of the car when standing.

[0150] Refer again Figure 1 The wheel assembly 200 includes two steering wheels 210, one of which is connected to the lower end of the front left vertical frame 113, and the other of which is connected to the lower end of the front right vertical frame 112. Compared with using one steering wheel 210, two steering wheels 210 are used in this embodiment, and the two steering wheels 210 are connected to the front left vertical frame 113 and the front right vertical frame 112, so that the load-bearing property and stability are better.

[0151] In the prior art, the steering wheel 210 is connected to the vehicle body through an axle head. When the cart is pushed on a smooth ground (such as the surface of glazed tiles), the steering wheel 210 will swing around its axle head due to the small friction between the steering wheel 210 and the ground, accompanied by a "tapping" noise. In view of this defect, the present embodiment further makes the following improvements.

[0152] Reference Figures 14 to 16 , Figure 1 The steering wheel 210 includes a wheel bracket 211 and a first shaft head 214. The first shaft head 214 is used to connect the front left vertical frame 113 or the front right vertical frame 112. The top of the wheel bracket 211 is provided with a downwardly concave annular groove 215. The center line of the annular groove 215 coincides with the center line of the first shaft head 214. The annular groove 215 is movably installed with a damping plate 213. A second spring 212 is provided between the damping plate 213 and the bottom of the annular groove 215. The top of the damping plate 213 protrudes from the top of the wheel bracket 211 and contacts and cooperates with the bottom surface of the front left vertical frame 113 or the front right vertical frame 112. The second spring 212 provides an elastic force to push the damping plate 213 upward. In this embodiment, the second spring 212 and the damping plate 213 are combined to increase the friction between the steering wheel 210 and the front left vertical frame 113 and the front right vertical frame 112 of the front frame, so that when the cart is pushed on a smooth ground (such as the surface of glazed tiles), the front frame 100 generates resistance to prevent the steering wheel 210 from swinging around the first shaft head 214 through the damping plate 213, thereby preventing the steering wheel 210 from swinging and preventing the "tapping" noise from being generated. When steering is required, steering can be achieved by simply applying an external force to the cart to overcome the resistance.

[0153] The damping sheet 213 is an assembly, and the damping sheet 213 includes a rigid ring 2131 and a flexible ring 2132. The rigid ring 2131 and the flexible ring 2132 are arranged in a superimposed manner, wherein the rigid ring 2131 is located at the bottom, and the rigid ring 2131 includes a connecting foot 2133. The second spring 212 is a spiral spring, and the connecting foot 2133 of the rigid ring 2131 extends into the spiral spring. In this embodiment, the damping sheet 213 is an assembly, and when the damping sheet 213 is worn, only the flexible ring 2132 needs to be replaced. Exemplarily, the material of the rigid ring is steel or hard plastic, and the material of the flexible ring 2132 is rubber or silicone.

[0154] In this embodiment, the number of the second springs 212 is two, and the two second springs 212 are evenly distributed in the annular groove 215 around the first shaft head 214. The number of the second spring 212 can also be one, and when one second spring 212 is used, the second spring 212 surrounds the first shaft head 214. The number of the second springs 212 can also be more than two, and when more than two second springs 212 are used, all the second springs 212 are evenly distributed in the annular groove 215 around the first shaft head 214.

[0155] Combination Figure 2 and Fig.17 The wheel assembly 200 includes an axle 230 and two rear wheels 220. The middle of the axle 230 is fixedly connected to the brake pedal 250. The two ends of the axle 230 are fixedly connected to two shock-absorbing brackets 240. The top of the shock-absorbing bracket 240 is provided with a plug-in portion 241. The rear frame 130 is detachably connected to the plug-in portion 241 of the shock-absorbing bracket 240. The rear wheel 220 includes a second shaft head 221. The second shaft head 221 penetrates the shock-absorbing bracket 240 and is fixedly connected to the axle 230. In this embodiment, the axle 230 is detachably connected to the rear frame 130, so that the axle 230 can be removed for maintenance.

[0156] When the rear wheel 220 and the axle 230 of the above structure bear a large load, the middle part of the axle 230 will bend downward and deform, and the upper edge of the rear wheel 220 will tilt toward the center of the axle 230, while the tilting direction of the lower edge of the wheel is opposite to the tilting direction of the upper edge of the wheel, and the left and right rear wheels 220 are in a state of approximately figure eight, so that the wear of the connection between the rear wheel 220 and the second shaft head 221 and the wear of the connection between the second shaft head 221 and the axle 230 will increase. In view of this defect, the present embodiment further makes the following improvements.

[0157] Reference Fig.18 and Fig.19 In this embodiment, the axle 230 includes an inner shaft tube 232 and an outer tube 231 which are sleeved together, and the center line of the inner shaft tube 232 coincides with the center line of the outer tube 231 , wherein a second gap 233 is provided between the outer tube 231 and the inner shaft tube 232 .

[0158] The second shaft head 221 is fixedly connected to the inner shaft tube 232. When the axle 230 bears a large load, the middle part of the inner shaft tube 232 will touch the outer tube 231 when it deforms downward, and will be subjected to the reaction force of the outer tube 231. The reaction force can reduce the deformation of the axle 230 and reduce the inclination of the rear wheel 220, thereby reducing the wear of the connection between the rear wheel 220 and the second shaft head 221, as well as reducing the wear of the connection between the second shaft head 221 and the axle 230.

[0159] In one embodiment, the outer tube 231 and the inner shaft tube 232 are aluminum alloy tubes, the outer diameter of the outer tube 231 is 22 mm, the outer diameter of the inner shaft tube 232 is 18 mm, the wall thickness of the inner shaft tube 232 is 6 mm, and the second gap 233 between the outer tube 231 and the inner shaft tube 232 is 20 wires.

[0160] The above-mentioned specific embodiments are used to describe the present invention in detail. These detailed descriptions are only limited to helping those skilled in the art understand the content of the present invention and cannot be understood as limiting the protection scope of the present invention. Various modifications, equivalent transformations, etc. made by those skilled in the art to the above-mentioned scheme under the conception of the present invention should be included in the protection scope of the present invention.

Claims

1. A foldable multifunctional baby stroller, characterized in that: It comprises a foldable main body frame (100) and a wheel assembly (200); The main frame (100) comprises a front frame (110), a rear frame (130) and a side frame (120); The side frame (120) comprises a column (123), an upper front beam (121) and a lower front beam (122) connecting the column (123) and the front frame (110), an upper rear beam (126) and a lower rear beam (124) connecting the column (123) and the rear frame (130), and a locking mechanism (125) arranged at a joint of the upper front beam (121), the upper rear beam (126) and the column (123); The locking mechanism (125) comprises a base plate (1253), a movable pin (1251) and a switch plate (1257); the base plate (1253) is fixedly connected to the upper end of the column (123); The base plate (1253) is provided with a fixing pin (1254), and the upper front beam (121) and the upper rear beam (126) are rotatably connected to the fixing pin (1254). The base plate (1253) is provided with a first long hole (1252) below the fixing pin (1254), and the long side of the first long hole (1252) extends up and down; the upper front beam (121) and the upper rear beam (126) are provided with a second long hole (1210) corresponding to the first long hole (1252); the second long hole (1210) comprises an arc segment (1212), a first straight segment (1213) and a second straight segment (1211); the first straight segment (1213) is located at one end of the arc segment (1212), and when the main frame (100) is in an unfolded state, the first straight segment (1213) is aligned with the first long hole (1252); the second straight segment (1211) is located at the other end of the arc segment (1212), and when the main frame (100) is in a folded state, the second straight segment (1211) is aligned with the first long hole (1252); The movable pin (1251) passes through the first long hole (1252) and the second long hole (1210). The switch plate (1257) is fixedly connected to the movable pin (1251), and the switch plate (1257) is used to manipulate the movable pin (1251) to move upward, switching from the first straight line segment (1213) or the second straight line segment (1211) of the second long hole (1210) to the entrance of the circular arc segment (1212) of the second long hole (1210). A first spring (1255) is arranged between the switch plate (1257) and the base plate (1253), and the first spring (1255) provides an elastic force to push the switch plate (1257) downward.

2. The foldable multifunctional baby stroller according to claim 1, characterized in that: The base plate (1253) comprises two fixing pins (1254) which are arranged at intervals in the front-rear direction; the upper front beam (121) is rotatably connected to one of the two fixing pins (1254); and the upper rear beam (126) is rotatably connected to the other of the two fixing pins (1254).

3. The foldable multifunctional baby stroller according to claim 1, characterized in that: In the left-right direction, a first gap is formed between the upper front beam (121) and the upper rear beam (126), and the locking mechanism (125) includes a partition plate (1258), which is arranged in the first gap to separate the upper front beam (121) and the upper rear beam (126) and guide the upper front beam (121) and the upper rear beam (126) to rotate.

4. The foldable multifunctional baby stroller according to claim 3, characterized in that: The base plate (1253) includes a left plate body (12531) and a right plate body (12532) arranged opposite to each other, and an upper plate body (12533) connecting the left plate body (12531) and the right plate body (12532) into one body from the top, and the upper front beam (121), the upper rear beam (126) and the partition (1258) are arranged between the left plate body (12531) and the right plate body (12532).

5. The foldable multifunctional baby stroller according to claim 1, characterized in that: The arc length of the arc segment (1212) of the second long hole (1210) is L / 4, and L is the circumference of a circle (Y1) with the fixing pin (1254) as the center and the distance from the fixing pin (1254) to the intersection of the arc segment (1212) of the second long hole (1210) and the first straight line segment (1213) as the radius.

6. The foldable multifunctional baby stroller according to claim 1, characterized in that: The lower end of the upright column (123) is connected to a connecting plate (1232), and the connecting plate (1232) comprises two meshing synchronous gears (1231), one of the two synchronous gears (1231) is fixedly connected to the lower front beam (122), and the other of the two synchronous gears (1231) is fixedly connected to the lower rear beam (124).

7. The foldable multifunctional baby stroller according to claim 6, characterized in that: Decorative covers are provided on the outer sides of the connecting plate (1232) and the synchronous gear (1231).

8. The foldable multifunctional baby stroller according to claim 1, characterized in that: The locking mechanism (125) comprises a decorative cover (1259), a hole is formed on a side surface of the decorative cover (1259), and the switch plate (1257) is exposed from the hole.

9. The foldable multifunctional baby stroller according to claim 1, characterized in that: The upper front beam (121) and the upper rear beam (126) include steel plates and decorative pipes sleeved outside the steel plates.

10. The foldable multifunctional baby stroller according to claim 1, characterized in that: The wheel assembly (200) comprises two steering wheels (210), the front frame (110) comprises a front left vertical frame (113) and a front right vertical frame (112), one of the two steering wheels (210) is connected to the lower end of the front left vertical frame (113), and the other of the two steering wheels (210) is connected to the lower end of the front right vertical frame (112).

11. The foldable multifunctional baby stroller according to claim 10, characterized in that: The steering wheel (210) comprises a wheel bracket (211) and a first shaft head (214), wherein the first shaft head (214) is used to connect the front left vertical frame (113) or the front right vertical frame (112), wherein a downwardly recessed annular groove (215) is provided at the top of the wheel bracket (211), the center line of the annular groove (215) coincides with the center line of the first shaft head (214), a damping plate (213) is movably mounted in the annular groove (215), a second spring (212) is provided between the damping plate (213) and the bottom of the annular groove (215), the top of the damping plate (213) protrudes from the top of the wheel bracket (211) and contacts and cooperates with the bottom surface of the front left vertical frame (113) or the front right vertical frame (112).

12. The foldable multifunctional baby stroller according to claim 11, characterized in that: The damping plate (213) comprises a rigid ring (2131) and a flexible ring (2132), wherein the rigid ring (2131) and the flexible ring (2132) are arranged in a superimposed manner, wherein the rigid ring (2131) is located below the flexible ring (2132), wherein the rigid ring (2131) comprises a connecting foot (2133), and wherein the second spring (212) is a coil spring, wherein the connecting foot (2133) extends into the coil spring.

13. The foldable multifunctional baby stroller according to claim 11, characterized in that: The number of the second springs (212) is at least two, and all the second springs (212) are evenly distributed in the annular groove (215) around the first shaft head (214).

14. The foldable multifunctional baby stroller according to claim 1, characterized in that: The wheel assembly (200) comprises an axle (230) and two rear wheels (220); the middle of the axle (230) is fixedly connected to a brake pedal (250); the two ends of the axle (230) are fixedly connected to two shock-absorbing brackets (240); a plug-in portion (241) is provided at the top of the shock-absorbing bracket (240); the rear frame (130) is detachably connected to the plug-in portion (241); the rear wheel (220) comprises a second shaft head (221); the second shaft head (221) passes through the shock-absorbing bracket (240) and is fixedly connected to the axle (230).

15. The foldable multifunctional baby stroller according to claim 14, characterized in that: The axle (230) comprises an inner axle tube (232) and an outer tube (231) which are sleeved together, the center line of the inner axle tube (232) coincides with the center line of the outer tube (231), and a second gap (233) is provided between the outer tube (231) and the inner axle tube (232).

16. The foldable multifunctional baby stroller according to claim 15, characterized in that: The outer tube (231) and the inner shaft tube (232) are aluminum alloy tubes, the outer diameter of the outer tube (231) is 22 mm, the outer diameter of the inner shaft tube (232) is 18 mm, the wall thickness of the inner shaft tube (232) is 6 mm, and the second gap (233) is 20 mm.

Images