A backrest structure for strollers has a linkage bar to connect the frame and the backrest to enable the backrest of the stroller to be folded or anchored synchronously with the collapsing or extending of the frame. The backrest structure includes a backrest-adjusting device to provide the linkage m
A backrest structure for strollers has a linkage bar to connect the frame and the backrest to enable the backrest of the stroller to be folded or anchored synchronously with the collapsing or extending of the frame. The backrest structure includes a backrest-adjusting device to provide the linkage movement and also offer multiple stage adjustment of the backrest angle.
대표청구항▼
1. A backrest structure for a collapsible stroller which has a frame movable between a sitting position and a collapsed position, and a loading rack mounted on the frame having an anchor section which has a portion for seating a passenger, comprising:a backrest adjusting means pivotally mounting on
1. A backrest structure for a collapsible stroller which has a frame movable between a sitting position and a collapsed position, and a loading rack mounted on the frame having an anchor section which has a portion for seating a passenger, comprising:a backrest adjusting means pivotally mounting on the anchor section;a movable backrest pivotally engaging with the backrest adjusting means and being movable between a first position and a second position when the frame is at the sitting position, the backrest being substantially erected upwards at the first position to allow the passenger leaning thereon, the backrest being located at the second position when the frame is at the collapsed position; anda linkage bar having a first end pivotally engaging with the frame and a second end pivotally engaging with the backrest adjusting means, the linkage bar supporting the backrest adjusting means and the backrest at the first position when the frame is at the sitting position, the frame driving the linkage bar and moving the backrest adjusting means to turn the backrest synchronously with the frame to the second position for folding when the frame is moved from the sitting position to the collapsed position;wherein the frame includes:a latch means for latching the frame on the sitting position and releasing the frame from the sitting position;a first rack having a first end connecting to a handle and a second end pivotally engaging with the latch means;a second rack having a first end fastened to the latch means, a second end pivotally engaging with a plurality of front wheels, and a pivotal point located between the first end and the second end thereof to pivotally engage with one end of the anchor section of the loading rack; anda third rack having one end pivotally engaging with the latch means, a second end pivotally engaging with a plurality of rear wheels, and a pivotally point located between the first end and the second end thereof to pivotally engage with another end of the anchor section of the loading rack. 2. The backrest structure for a stroller of claim 1, wherein the first end of the linkage bar is pivotally engaged with the third rack, and the second end of the linkage bar being pivotally engaged with the backrest. 3. A backrest structure for a collapsible stroller which has a frame movable between a sitting position and a collapsed position, and a loading rack mounted on the frame having an anchor section which has a portion for seating a passenger, comprising:a backrest adjusting means pivotally mounting on the anchor section;a movable backrest pivotally engaging with the backrest adjusting means and being movable between a first position and a second position when the frame is at the sitting position, the backrest being substantially erected upwards at the first position to allow the passenger leaning thereon, the backrest being located at the second position when the frame is at the collapsed position; anda linkage bar having a first end pivotally engaging with the frame and a second end pivotally engaging with the backrest adjusting means, the linkage bar supporting the backrest adjusting means and the backrest at the first position when the frame is at the sitting position, the frame driving the linkage bar and moving the backrest adjusting means to turn the backrest synchronously with the frame to the second position for folding when the frame is moved from the sitting position to the collapsed position, wherein the backrest adjusting means includes:a rotary member having one end forming a stepwise surface of at least one step, a first pivotal point pivotally engaging with the backrest, a second pivotal point pivotally engaging with the anchor section and a third pivotal point pivotally engaging with the second end of the linkage bar;an anchor member slidably coupling with the backrest and having one end forming a stepwise surface complementary and engagable with the stepwise surface of the rotary member, where in the backrest is turnable about the first pivotal point to a lying position when the anchor member is separated from the rotary member; andan elastic element located in the backrest to provide a force to engage the anchor member with the rotary member. 4. The backrest structure for a stroller of claim 3, wherein the rotary member has one side which has a cavity to hold a tail end of the backrest. 5. The backrest structure for a stroller of claim 3, wherein the elastic element is a helical spring. 6. A stroller collapsible automatically being movable between a sitting position and a collapsed position, comprising:a seat tube having an anchor section and a movable backrest, the anchor section having a portion for holding an infant, the backrest being pivotally engaged with the anchor section and being movable between a first position and a second position, the backrest being substantially erected upwards at the first position to allow a passenger leaning thereon, the backrest being directed substantially rearwards to allow the passenger lying thereon at a lying position, the backrest being located on the first position or the lying position when the stroller is at the sitting position, and being located on the second position when the stroller is at the collapsed position;a latch means;a push tube having a first end and a second end, the first end being connected to a handle, the second end being pivotally engaged with the latch means;a front leg tube having a first end, a second end and a pivotal point located between the first end and the second end thereof, the first end being fastened to the latch means, the second end being engaged with a plurality of front wheels, the pivotal point being pivotally engaged with one end of the anchor section of the seat tube;a rear leg tube having a first end, a second end and a pivotal point located between the first end and the second end thereof, the first end being pivotally engaged with the latch means, the second end being engaged with a plurality of rear wheels, the pivotal point being pivotally engaged with another end of the anchor section of the seat tube; anda backrest adjusting means including:a rotary member having one end forming a stepwise surface of at least one step, a first pivotal point pivotally engaging with the backrest, a second pivotal point pivotally engaging with the anchor section and a third pivotal point;an anchor member slidably coupling with the backrest and having one end forming a stepwise surface complementary and engagable with the stepwise surface of the rotary member, wherein the backrest is turnable about the first pivotal point to the lying position when the anchor member is separated from the rotary member;an elastic element located in the backrest to provide a force to engage the anchor member with the rotary member; anda linkage bar having a first end pivotally engaging with the rear leg tube and a second end pivotally engaging with the third pivotal point of the rotary member, the linkage bar supporting the rotary member and the backrest when the stroller is at the sitting position and the backrest is at the first position, the rear leg tube driving the linkage bar and moving the backrest adjusting means to turn the backrest synchronously with the rear leg tube to the second position for folding when the stroller is moved from the sitting position to the collapsed position.
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이 특허에 인용된 특허 (12)
Huang Li-Chu C. (No. 9 ; Alley 2 ; Lane 606 ; Sec. 2 ; Po Ai Rd. Chia Yi City TWX), Adjusting/positioning device for a backrest of a stroller.
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