초록 ▼

A foldable stroller frame has three sections (a lower-front section, a lower-rear section, and an upper-rear section) joined to and foldable around a common hub structure. The hub structure includes two hubs located on the left and right sides of the stroller frame. In at least one of the hubs, a br

A foldable stroller frame has three sections (a lower-front section, a lower-rear section, and an upper-rear section) joined to and foldable around a common hub structure. The hub structure includes two hubs located on the left and right sides of the stroller frame. In at least one of the hubs, a bracket structure is mounted to the lower-rear section and holds two gears which are attached to the lower-front section and upper-rear section, respectively. The two gears are engaged with each other, so that the lower-front section and upper-rear section rotate in synchrony with respect to the lower-rear section when the stroller frame is being folded. The hub also includes a releasable locking mechanism, which is controlled by a pull trigger located on the upper-rear section of the stroller near the push handles, for locking the stroller frame in the unfolded state.

대표청구항 ▼

1. A foldable stroller frame comprising: a lower-front section;a lower-rear section;an upper-rear section having an end section forming a push handle of the stroller; anda hub structure,wherein the lower-front section, the lower-rear section and the upper-rear section are joined to the hub structure

1. A foldable stroller frame comprising: a lower-front section;a lower-rear section;an upper-rear section having an end section forming a push handle of the stroller; anda hub structure,wherein the lower-front section, the lower-rear section and the upper-rear section are joined to the hub structure and are foldable with respect to one another around the hub structure,wherein the hub structure includes a first gear and a second gear, the first gear being fixedly attached to one of the lower-front section, the lower-rear section and the upper-rear section, the second gear being fixedly attached to another one of the lower-front section, the lower-rear section and the upper-rear section, and the first and second gear being engaged with each other and rotating when the stroller frame changes between an unfolded state and a folded state, the hub structure further including a releasable locking structure for preventing the lower-front section, the lower-rear section and the upper-rear section from folding with respect to one another around the hub structure,wherein the stroller frame further comprises a pull trigger located on the upper-rear section and connected to the releasable locking structure for releasing the locking structure to allow the lower-front section, the lower-rear section and the upper-rear section to fold with respect to one another around the hub structure,wherein the hub structure includes a first hub located on one side of the stroller frame,wherein each of the lower-front section, the lower-rear section and the upper-rear section includes a bar joined to the first hub,wherein the first hub includes a pair of brackets fixedly mounted on an end of the bar of the lower-rear section,wherein the first gear is fixedly attached to an end of the bar of the lower-front section, the first gear being disposed between the pair of brackets and rotatable around a first rotation axis defined by the brackets, andwherein the second gear is fixedly attached to an end of the bar of the upper-rear section, the second gear being disposed between the pair of brackets and rotatable around a second rotation axis defined by the brackets. 2. The foldable stroller frame of claim 1, further comprising: one or more front wheels mounted on the lower-front section; andtwo or more rear wheels mounted on the lower-rear section,wherein in the unfolded state of the stroller frame, the lower-front section extends from the hub structure to a lower-front location of the stroller frame near the front wheels, the lower-rear section extends from the hub structure to a lower-rear location of the stroller frame near the rear wheels, and the upper-rear section extends from the hub structure to an upper-rear location of the stroller frame, with an upper-most portion of the upper-rear section forming a handle of the stroller, andwherein in the folded state, the front wheels, the rear wheels and the push handle are located in close proximity of one another. 3. The foldable stroller frame of claim 1, wherein at least one of the pair of brackets defines a guiding slot having a substantially arc shaped first part and a substantially radially disposed second part connected to the first part,wherein the first hub further comprises:a locking pin slidably disposed along the bar of the upper-rear section; anda biasing member disposed to bias the locking pin in a direction along the bar of the upper-rear section,wherein the locking pin is slidable along the first part of the guiding slot as the upper-rear section rotates around the second rotation axis when the stroller frame changes between the folded and unfolded states, and the locking pin slides into the second part of the guiding slot under the bias of the biasing member when the stroller frame is in the unfolded state. 4. The foldable stroller frame of claim 3, wherein the pull trigger is connected to the locking pin by a release wire, to manually overcome the bias of the biasing member and cause the pin to slide out of second part of the guiding slot. 5. The foldable stroller frame of claim 1, wherein the hub structure further includes a second hub located on another side of the stroller frame, and wherein each of the lower-front section, the lower-rear section and the upper-rear section includes a second bar joined to the second hub. 6. A foldable stroller frame comprising: a first section;a second section;a third section;a hub structure; anda pull trigger located on one of the first, second or third sections,wherein the first, second and third sections are joined to the hub structure and are foldable with respect to one another around the hub structure,wherein the hub structure includes a first hub located on one side of the stroller frame, wherein each of the first, second and third sections includes a bar joined to the first hub, wherein the first hub includes: a bracket structure fixedly mounted on an end of the bar of the first section;a first gear fixedly mounted on an end of the bar of the second section, the first gear being rotatable around a first rotation axis defined by the bracket structure;a second gear fixedly mounted on an end of the bar of the third section, the second gear being rotatable around a second rotation axis defined by the bracket structure,wherein the first gear and second gear are engaged with each other and rotate when the stroller frame changes between an unfolded state and a folded state; anda releasable locking structure for preventing the first, second and third sections from folding with respect to one another around the first hub, andwherein the pull trigger located on one of the first, second or third sections is connected to the releasable locking structure for releasing the locking structure to allow the first, second and third sections to fold with respect to one another around the hub structure. 7. The foldable stroller frame of claim 6, wherein the bracket structure defines a guiding slot having a substantially arc shaped first part and a substantially radially disposed second part connected to the first part,wherein a releasable locking structure of the first hub comprises:a locking pin slidably disposed along the bar of the third section; anda biasing member disposed to bias the locking pin in a direction along the bar of the third section,wherein the locking pin is slidable along the first part of the guiding slot as the third section rotates around the second rotation axis when the stroller frame changes between the folded and unfolded states, and the locking pin slides into the second part of the guiding slot under the bias of the biasing member when the stroller frame is in the unfolded state. 8. The foldable stroller frame of claim 7, wherein the pull trigger is connected to the locking pin by a release wire, to manually overcome the bias of the biasing member and cause the pin to slide out of second part of the guiding slot. 9. The foldable stroller frame of claim 8, wherein the hub structure further includes a second hub located on another side of the stroller frame, and wherein each of the first, second and third sections includes a second bar joined to the second hub. 10. The foldable stroller frame of claim 9, wherein each of the first, second and third sections has a substantially planar shape when viewed from a side of the stroller.