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A stroller frame includes a handle assembly, a front leg assembly and a rear leg assembly having rotating end hubs which are pivotably connected to each other about a hub axis to be rotated so as to allow the stroller frame to transform between folded and unfolded states. A tray mounting assembly is

A stroller frame includes a handle assembly, a front leg assembly and a rear leg assembly having rotating end hubs which are pivotably connected to each other about a hub axis to be rotated so as to allow the stroller frame to transform between folded and unfolded states. A tray mounting assembly is coupled with a tray, is rotatably mounted on one of two rotating end hubs, and is rotated along with the relative rotation of the end hubs to convert the tray to folded and unfolded positions. A tray latching assembly is disposed to retain and support the tray mounting assembly to keep the tray stable in the unfolded position when the stroller frame is in the unfolded state.

대표청구항 ▼

1. A stroller frame comprising: a handle assembly having a first rotating end hub and a first distal end;a front leg assembly having a second rotating end hub and a second distal end, said second rotating end hub being pivotably connected with said first rotating end hub about a hub axis to be rotat

1. A stroller frame comprising: a handle assembly having a first rotating end hub and a first distal end;a front leg assembly having a second rotating end hub and a second distal end, said second rotating end hub being pivotably connected with said first rotating end hub about a hub axis to be rotated relative to said first rotating end hub so as to allow said stroller frame to transform between a folded state, where said first and second distal ends are close to each other, and an unfolded state, where said first and second distal ends are remote from each other;a rear leg assembly pivotably connected with said front leg assembly;a tray;a tray mounting assembly coupled with said tray, and rotatably mounted on one of said first and second rotating end hubs such that said tray mounting assembly is rotated relative to said one of said first and second rotating end hubs when said second rotating end hub is rotated relative to said first rotating end hub to move said stroller frame to one of the folded and unfolded states, thereby converting said tray to one of a folded position and an unfolded position, said tray mounting assembly having a peripheral surface surrounding a central axis which is offset from and parallel to the hub axis and about which said tray mounting assembly is rotated, and a recess concaved from said peripheral surface toward the central axis;a tray latching assembly having a latch end which is operatively engaged in said recess to retain and support said tray mounting assembly when said stroller frame is in the unfolded state so as to keep said tray in the unfolded position. 2. The stroller frame as claimed in claim 1, wherein said rear leg assembly has a third rotating end hub coaxially and pivotably connected with said first and second rotating end hubs about the hub axis. 3. The stroller frame as claimed in claim 1, further comprising a frame latching assembly which is disposed on said rear leg assembly and which is operative to latch said first and second rotating end hubs to guard rotation relative thereto when said stroller frame is in the unfolded state. 4. The stroller frame as claimed in claim 3, wherein said frame latching assembly includes a pulling rod which is connected with said tray latching assembly to synchronously move said tray latching assembly in an unlatching direction to disengage from said tray mounting assembly when said frame latching assembly is operated to unlatch said first and second rotating end hubs, and to move said tray latching assembly in a latching direction to retain and support said tray mounting assembly when said stroller frame is in the unfolded state. 5. The stroller frame as claimed in claim 4, wherein said frame latching assembly includes a biasing member having an end which abuts against said pulling rod and an opposite end which abuts against said rear leg assembly so as to bias said pulling rod and said tray latching assembly in the latching direction. 6. The stroller frame as claimed in claim 5, wherein said frame latching assembly includes a latch pin, said pulling rod being formed with a first pin hole, said latch pin being inserted into said first pin hole and being operatively movable to be inserted into said first and second rotating end hubs when said stroller frame is in the unfolded state, and to be disengaged from said first and second rotating end hubs to unlatch said first and second rotating end hubs. 7. The stroller frame as claimed in claim 6, wherein said tray latching assembly has a second pin hole formed at a connecting end, said latch pin being inserted into said second pin hole to connect said tray latching assembly with said pulling rod. 8. The stroller frame as claimed in claim 1, wherein said one of said first and second rotating end hubs is formed with an arcuate rack which extends around the hub axis, said tray mounting assembly having a pinion which meshes with said arcuate rack to transmit a torque to turn said tray. 9. The stroller frame as claimed in claim 8, further comprising a transmitting linkage which has an end that is pivotably connected with said one of said first and second rotating end hubs and offset from the hub axis, and an opposite end that is pivotably connected with said tray mounting assembly and offset from a central axis of said tray mounting assembly so as to allow said tray mounting assembly to rotate about the central axis relative to said one of said first and second rotating end hubs along with rotation of said one of said first and second rotating end hubs about the hub axis. 10. The stroller frame as claimed in claim 9, wherein said pinion is disposed at and rotated about the central axis when moved along said arcuate rack. 11. The stroller frame as claimed in claim 1, wherein said tray mounting assembly has a rotating member which is rotatable relative to said first and second rotating end hubs, and a tray mounting member which is retainingly connected to said rotating member and which is coupled with said tray. 12. The stroller frame as claimed in claim 11, wherein said rotating member and said tray mounting member have engaging teeth and grooves which are engaged with each other in an axial direction parallel to the hub axis to guard against rotation relative to each other. 13. The stroller frame as claimed in claim 1, further comprising a joint housing defining therein a space for accommodating said first and second rotating end hubs, said tray mounting assembly and said tray latching assembly, and having a confining hole which extends therethrough and in spatial communication with said space, said tray mounting assembly being confined by said confining hole and partially projecting outwardly of said joint housing from said confining hole in an axial direction parallel to the hub axis to be coupled with said tray. 14. The stroller frame as claimed in claim 13, wherein said tray mounting assembly has a rotating member which is rotatable relative to said first and second rotating end hubs and which is confined by said confining hole and which partially projects outwardly of said joint housing, and a tray mounting member which is retainingly connected to said rotating member and which is disposed outwardly of said joint housing to be coupled with said tray. 15. The stroller frame as claimed in claim 14, wherein said tray mounting member has a pair of mounting slots each of which extends in a mounting direction that is transverse to the axial direction and terminates at a stop portion, said tray having a tray mounting end which is in spline engagement with said mounting slots and positioned by said stop portions so as to rotate with said tray mounting assembly.