Stroller frame

Abstract

A stroller frame characterized in that the stroller frame comprises a frame (1) wherein at least one front wheel assembly (2) is provided at a front of the frame (1) and at least two rear wheel assemblies (3) are provided at a rear of the frame (1), wherein the front wheel assembly (2) comprises a front wheel carrier (21) which is connected to the frame (1) and rotatable relative to the frame (1) in a horizontal plane, wherein a front wheel (22) is connected to the front wheel carrier (21) and rotatable relative to the front wheel carrier in a vertical plane, wherein the rear wheel assembly (3) comprises a rear wheel carrier (31) which is connected to the frame (1) and rotatable relative to the frame (1) in the horizontal plane, wherein a rear wheel (32) is connected to the rear wheel carrier (31) and rotatable relative to the rear wheel carrier in the vertical plane.and wherein a locking mechanism (4) for locking the rear wheel carrier (31) is provided on the frame (1), wherein the rear wheel carrier (31) is fixed relative to the frame (1) when the locking mechanism (4) is locked and is prevented from rotating in the horizontal plane, and wherein the rear wheel carrier (31) is movable relative to the frame (1) and rotatable in the horizontal plane when the locking mechanism (4) is unlocked.

Description

Technical field

[0001] The present utility model relates to a stroller frame. State of the art

[0002] Strollers are common products for growing infants and toddlers. Generally, a stroller frame consists of a chassis, a front wheel assembly, and a rear wheel assembly attached to the chassis. The front wheel assembly typically consists of universal wheels that can rotate 360 ​​degrees in a horizontal plane. This means the front wheels can rotate both vertically for propulsion and horizontally for changing direction. The rear wheel assembly, however, is usually fixed relative to the chassis, so the rear wheels can only rotate vertically for propulsion. While this design provides relatively stable movement, it limits maneuverability, especially in tight spaces, making it difficult to navigate.Furthermore, on occasions such as a visit to the zoo, the following problem arises: Since the seating direction corresponds to the direction of travel of the stroller, when an adult pushes the stroller along the animal enclosures, the child has to turn their head to the side to look at the animals in the enclosures, which can be unpleasant for the child.

[0003] Therefore, the present utility model is being developed due to the aforementioned deficiencies. Disclosure of the utility model

[0004] The present utility model aims to remedy the shortcomings of the prior art and provide a stroller frame with a simple structure that allows for forward, backward, and sideways movement. The stroller frame allows the stroller to be pushed easily in narrow spaces and enables the child to enjoy themselves comfortably at the zoo.

[0005] The present utility model is solved by the following technical solutions: A pram frame comprising a frame, wherein at least one front wheel assembly is provided at a front of the frame and at least two rear wheel assemblies are provided at a rear of the frame. The front wheel assembly comprises a front wheel carrier connected to the frame and rotatable relative to the frame in a horizontal plane, and a front wheel is connected to the front wheel carrier and rotatable relative to the front wheel carrier in a vertical plane. The rear wheel assembly comprises a rear wheel carrier connected to the frame and rotatable relative to the frame in a horizontal plane, and a rear wheel is connected to the rear wheel carrier and rotatable relative to the rear wheel carrier in a vertical plane.The frame is provided with a locking mechanism for securing the rear wheel carrier to a specific position. When the locking mechanism is engaged, the rear wheel carrier is fixed relative to the frame and prevented from rotating in the horizontal plane. When the locking mechanism is disengaged, the rear wheel carrier is movable relative to the frame and rotatable in the horizontal plane. The locking mechanism includes a locking hole provided on the rear wheel carrier. A locking pin is provided on a lower part of the frame, which is slidable within this lower part to engage with or disengage from the locking hole.An actuating element is provided on an upper part of the frame, and a pull cable is provided between the actuating element and the locking pin, connecting these two and capable of pulling the locking pin out of the locking hole when the actuating element is actuated. A first return spring is also provided in the frame, capable of sliding the locking pin back into its original position.

[0006] A mounting seat is provided on the upper part of the frame, and the actuating part comprises an actuating block that is slidably connected to the mounting seat and is exposed. A transverse hole is provided in the mounting seat, and a movement block is provided in the transverse hole, which is laterally movable within the transverse hole. One end of the pull cable is connected to the movement block, and the other end is connected to the locking pin. An inclined surface is provided on the actuating block, which is capable of pushing the movement block into motion when the actuating block slides inward relative to the mounting seat. A second return spring is also provided between the mounting seat and the actuating block, which is capable of sliding the actuating block back into its original position.

[0007] The frame comprises two front legs and two rear legs, with the front wheel assembly located at a lower end of the front legs and the rear wheel assembly at a lower end of the rear legs. The pram frame further comprises a U-shaped push bar, the lower end of which is rotatably connected to an upper end of the front legs via a locking joint. An upper end of the rear legs is hinged to the push bar and is located near its lower end. A connecting rod is also provided between the lower end of the rear legs and the front legs at a position near the upper end of the front legs, and is hinged to both. The actuating element is located on a central portion of the upper end of the push bar.

[0008] The locking joint has a detent seat for connection to a seat.

[0009] The front wheel assembly is rotatably connected to the front wheel carrier via a vertical axis, with a front wheel seat at the lower end of the frame. An annular groove is provided on the vertical axis. The front wheel seat contains an exposed and laterally movable detent locking plate, and the detent locking plate has a through-hole through which the vertical axis is inserted. When the detent locking plate moves, an inner edge of the through-hole engages with or disengages from the annular groove. A third return spring is provided between the detent locking plate and the front wheel seat. When the detent locking plate engages the annular groove, the front wheel assembly is connected to the frame and rotatable relative to the frame in the horizontal plane. When the detent locking plate disengages from the annular groove, the front wheel assembly can be removed from the frame.

[0010] Compared to the prior art, the present utility model offers the following advantages: When the locking mechanism for securing the rear wheel carrier to the stroller frame of the present utility model is unlocked, the rear wheel carrier, together with the rear wheel, can rotate 360 ​​degrees in the horizontal plane, while the front wheel carrier, together with the front wheel, can always rotate 360 ​​degrees in the horizontal plane. Therefore, with the locking mechanism unlocked, both the front and rear wheel assemblies are in a state of universal wheels. When maneuvering the frame, the user can cause it to move laterally to the left and right, similar to a crab, and simultaneously move forwards and backwards. This makes the stroller's movement very flexible, which facilitates passage and maneuvering in confined spaces.Furthermore, on occasions such as a zoo visit, the adult can push the stroller sideways along the enclosures so that the child faces the animals, enhancing the child's enjoyment. When not needed in confined spaces or on special occasions like a zoo visit, the locking mechanism can be engaged. In this case, the rear wheel assembly is fixed relative to the frame and cannot rotate horizontally. The rear wheels then act as steering wheels, working in conjunction with the front wheels to improve directional control and stability when the stroller is traveling straight. Brief description of the drawings Fig. Figure 1 is a side view of the present utility model; Fig. 2 is a perspective view of the present utility model in forward and reverse driving states; Fig. Figure 3 is a perspective view of the present utility model in the state of lateral movement to the left and right; Fig. Figure 4 is a first exploded view of the components of the present utility model; Fig. Figure 5 is a second exploded view of the components of the present utility model; Fig. Figure 6 is a perspective view of the components of the present utility model; Fig. Figure 7 is a sectional view of the components of the present utility model; Fig. Figure 8 is a third exploded view of the components of the present utility model. Detailed description of embodiments

[0011] The present utility model is described in more detail below in conjunction with the attached drawings: As in the Fig. As shown in Figures 1 to 3, a stroller frame comprises a frame 1, wherein at least one front wheel assembly 2 is provided at a front of the frame 1. In this embodiment, two front wheel assemblies 2 are provided. At least two rear wheel assemblies 3 are provided at a rear of the frame 1. The front wheel assembly 2 comprises a front wheel carrier 21, which is connected to the frame 1 and rotatable relative to the frame 1 in a horizontal plane, and a front wheel 22 is connected to the front wheel carrier 21 and is rotatable relative to the front wheel carrier in a vertical plane. The rear wheel assembly 3 comprises a rear wheel carrier 31, The front wheel carrier 31 is connected to the frame 1 and is rotatable relative to the frame 1 in the horizontal plane. A rear wheel 32 is connected to the rear wheel carrier 31 and is rotatable relative to the rear wheel carrier 32 in the vertical plane. A locking mechanism 4 is provided on the frame 1 for locking the rear wheel carrier 31 in a specific position. When the locking mechanism 4 is unlocked, the rear wheel carrier 31, together with the rear wheel 32, can rotate 360 ​​degrees in the horizontal plane, while the front wheel carrier 21, together with the front wheel 22, can always rotate 360 ​​degrees in the horizontal plane. Therefore, with the locking mechanism 4 unlocked, both the front wheel assembly 2 and the rear wheel assembly 3 are in the position of universal wheels. When maneuvering the frame 1, the user can cause the frame 1 to move laterally to the left and right (as shown in the diagram). Fig. (3 shown), similar to a crab, and can move both forwards and backwards simultaneously. This makes the stroller very flexible, facilitating its passage and maneuverability in confined spaces. Furthermore, on occasions such as a zoo visit, the adult can push the stroller sideways along the enclosures. so that the child faces the animals in the enclosures head-on, which increases the child's enjoyment. If use in confined spaces or on special occasions such as a zoo visit is not required, The locking mechanism 4 can be locked. In this case, the rear wheel carrier 31 is fixed relative to the frame 1 and cannot rotate in the horizontal plane. The rear wheels 32 are used as steering wheels (as in Fig. 1 shown), which work together with the front wheels 22, making the stroller's ride more stable. As in the Fig. As shown in Figures 6 to 8, the locking mechanism 4 includes a locking hole 41 provided on the rear wheel carrier 31. A locking pin 42 is provided on a lower part of the frame 1. which is slidable in this lower part to engage with or disengage from the locking hole 41. An actuating element 43 is provided on an upper part of the frame 1, and a pull cable 44 is provided between the actuating element 43 and the locking pin 42, connecting these two and capable of pulling the locking pin 42 out of the locking hole 41 when the actuating element 43 is actuated. A first return spring 45 is also provided in the frame 1, which is capable of sliding the locking pin 42 back into its original position. When the locking mechanism 4 needs to be unlocked, the pull cable 44 is pulled via the actuating element 43, so that the pull cable 44 pulls the locking pin 42 out of the locking hole 41.At this point, the locking mechanism 4 is unlocked, and both the rear wheel assembly 3 and the front wheel assembly 2 are in the universal wheel state, allowing the stroller to be moved more flexibly and conveniently. When the locking mechanism 4 needs to be re-locked, the first return spring 45 pushes the locking pin 42 into the locking hole 41. At this point, the rear wheel assembly 4 is used as a steering wheel, working in conjunction with the front wheel assembly 2, thus making the stroller's movement more stable.

[0012] As in Fig. As shown in Figure 8, a mounting seat 10 is provided on the upper part of the frame 1, and the actuating part 43 comprises an actuating block 431, which is slidably connected to the mounting seat 10 and is exposed. A transverse hole 432 is provided in the mounting seat 10, and a movement block 433 is provided in the transverse hole 432, which is laterally movable in the transverse hole. One end of the pull cable 44 is connected to the movement block 433, and the other end is connected to the locking pin 42. An inclined surface 434 is provided on the actuating block 431, which is capable of pushing the movement block 433 into motion when the actuating block slides inwards relative to the mounting seat 10. A second return spring 435 is also provided between the mounting seat 10 and the actuating block 431, which is capable of slidably returning the actuating block 431 to its original position.When the actuating block 431 is pressed, the inclined surface 434 on the actuating block 431 presses the movement block 433. The movement block 433 pulls on the pull cable 44, thus releasing the locking pin 42 from the locking hole 41 and unlocking the locking mechanism 4. This unlocking of the locking mechanism 4 is also very convenient and quick. When needed, the user simply needs to grasp the frame 1 with one hand and press the actuating block 431 to unlock it. After unlocking, the user can move the frame 1 with the same hand, meaning the stroller can be moved with one hand, which is very flexible.

[0013] As in the Fig. As shown in Figures 1 to 3, the frame 1 comprises two front legs 11 and two rear legs 12, with the front wheel assembly 2 located at a lower end of the front legs 11 and the rear wheel assembly 3 at a lower end of the rear legs 12. The pram frame further comprises a U-shaped push bar 13, the lower end of which is rotatably connected to an upper end of the front legs 11 via a locking joint 14. An upper end of the rear legs 12 is pivotally connected to the push bar 13 and is located near the lower end of the push bar. A connecting rod 17 is also provided between the lower end of the rear legs 12 and the front legs 11 at a position near the upper end of the front legs 11, and is pivotally connected to both. The actuating element 43 is located on a central part of the upper end of the push bar 13.Therefore, the stroller frame can also be folded after unlocking the locking joint 14. Specifically, the push bar 13 rotates relative to the front legs 11 and the rear legs 12, with the upper end of the push bar 13 approaching the rear wheels 32 and the push bar 13 folding towards the rear legs 12. In this process, the connecting rod 17 rotates relative to the rear legs 12 and the front legs 11, and the front legs 11 also fold towards the rear legs 12. The entire stroller frame is easy to carry or store after folding. The child seat can be suspended from the frame 1 as a flexible seat attachment. Alternatively, a fixed seat 15 can be provided at the locking joint 14, and a separate seat assembly can be detachably connected to the fixed seat 15.

[0014] As in the Fig. 4 and Fig.As shown in Figure 5, the front wheel assembly 2 is rotatably connected to the front wheel carrier 21 via a vertical axis 23 to a front wheel seat 16 at the lower end of the frame 1. An annular groove 51 is provided on the vertical axis 23. An exposed and laterally movable detent locking plate 52 is provided in the front wheel seat 16, and a through-hole 53 is provided in the detent locking plate 52 through which the vertical axis 23 is inserted. When the detent locking plate 52 moves, an inner edge of the through-hole 53 engages with or disengages from the annular groove 51. A third return spring 54 is provided between the detent locking plate 52 and the front wheel seat 16. When the detent locking plate 52 engages the annular groove 51, the front wheel assembly 2 is connected to the frame 1 and rotatable relative to the frame 1 in the horizontal plane.By pressing the locking plate 42 to release the locking plate 52 from the annular groove 51, the front wheel assembly 2 can be pulled off the front wheel seat 16. In this embodiment, the rear wheel assembly 3 is also detachably connected to the frame 1 by the same structure, which will not be explained further here. Because the front wheel assembly 2 and the rear wheel assembly 3 are detachably connected to the frame 1, the packaging volume of the product can be reduced, and the wheels can be easily replaced if damaged.

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