A stroller backrest tilting adjusting device is provided. The stroller backrest tilting adjusting device comprises two supporting straps for supporting the backrest of the stroller, each supporting strap having a fixed end attached to a frame of the stroller and a free end; a strap direction guidin
A stroller backrest tilting adjusting device is provided. The stroller backrest tilting adjusting device comprises two supporting straps for supporting the backrest of the stroller, each supporting strap having a fixed end attached to a frame of the stroller and a free end; a strap direction guiding unit allowing the free end of each of the straps to pass therethrough and guiding the straps' direction; and an adjusting assembly fixed to an upper portion of the backrest which is capable of adjusting the effective supporting length of the straps to thereby adjusting the tilting angle of the backrest of the stroller by operating a one-way locking member, which is disposed in the adjusting assembly and has a cam effecting portion for increasingly exerting locking force.
대표청구항▼
What is claimed is: 1. A backrest tilting adjusting device of a stroller comprising: two supporting straps for supporting a backrest of the stroller, each supporting strap having a fixed end attached to a frame of the stroller and a free end; a strap direction guiding unit having an elongate openin
What is claimed is: 1. A backrest tilting adjusting device of a stroller comprising: two supporting straps for supporting a backrest of the stroller, each supporting strap having a fixed end attached to a frame of the stroller and a free end; a strap direction guiding unit having an elongate opening formed therein to allow the free end of each of the straps passing through; and an adjusting assembly comprising: a base member attached to an upper portion of the backrest and having a bottom portion, a strap inlet end through which the free ends of the supporting straps enter the adjusting assembly, and a strap outlet end through which the free ends of the supporting straps exit the adjusting assembly, and a strap inserting direction being defined as the direction from strap inlet end to the strap outlet end; a one-way locking member pivotally coupled to the base member and arranged such that the straps entering the adjusting assembly pass between the base member and one-way locking member, and having an operating portion and a cam effecting portion for increasingly exerting a locking force to the straps; and a biasing member coupled to the base member and the one-way locking member for pivoting the one-way locking member toward the base member such that the cam effecting portion of the one-way locking member may engage with the straps and press them firmly against the base member, and wherein the pivoting direction of the one-way locking member is opposite to the strap inserting direction, and the cam effecting portion of the one-way locking member is adapted such that the locking force exerted by the cam effecting portion to the supporting straps against the base member will increase as the pivoted angle of the one-way locking member increase and eventually reach a level large enough to prevent the supporting straps from moving. 2. A stroller backrest tilting adjusting device according to claim 1, wherein the cam effecting portion comprises a plurality of engaging teeth, each engaging tooth having a distance r away from a pivot center of the one-way locking member and the distance r of each engaging tooth is different from each other; the engaging teeth being arranged such that the engaging tooth having the smallest distance r will engage with the supporting straps when the one-way locking member is pivoted a smallest angle, and the engaging tooth having the largest distance r engages with the supporting straps when the one-way locking member is pivoted a largest angle. 3. A stroller backrest tilting adjusting device according to claim 1, wherein the strap direction guiding unit includes two rotatably coupled guiding members and each of the guiding members has an elongate opening formed therein for a free end of the supporting strap passing through. 4. A stroller backrest tilting adjusting device according to claim 1, wherein the bottom portion of the base member is further provided with a step-like protrusion. 5. A stroller backrest tilting adjusting device according to claim 1, wherein an opening is provided in the operating portion of the one-way locking member to allow a pulling strap passing through. 6. A stroller backrest tilting adjusting device according to claim 1, wherein the one-way locking member comprises a substantially hollow cylindrical body, and the operating portion tangentially extends out from a cylindrical sidewall of the body along a direction toward the strap outlet end of the base member, and the cam effecting portion is formed at the cylindrical sidewall of the body near the operating portion, such that an angle between the cam effecting portion and the operating portion is within a range of 75 degrees to 135 degrees. 7. A stroller backrest tilting adjusting device according to claim 2, wherein the one-way locking member comprises a substantially hollow cylindrical body, and the operating portion tangentially extends out from a cylindrical sidewall of the body along a direction toward the strap outlet end of the base member, and the cam effecting portion is formed at the cylindrical sidewall of the body near the operating portion, such that an angle between the cam effecting portion and the operating portion is within a range of 75 degrees to 135 degrees. 8. A stroller backrest tilting adjusting device according to claim 6 or 7, wherein the biasing member comprises a spiral torsion spring which is disposed in the body of the one-way locking member. 9. A stroller backrest tilting adjusting device according to claim 1, wherein the free ends of the two supporting straps are bound together after coming out from the adjusting assembly to formed a common free end and a pulling-ring is provided to the common free end. 10. A stroller comprising: a frame; an adjustable backrest attached to the frame; and a backrest tilting adjusting device including: two supporting straps for supporting the backrest, each supporting strap having a fixed end attached to the frame and a free end; a strap direction guiding unit having an elongate opening formed therein to allow the free end of each of the straps passing through; and an adjusting assembly comprising: a base member attached to an upper portion of the backrest and having a bottom portion, a strap inlet end through which the free ends of the supporting straps enter the adjusting assembly, and a strap outlet end through which the free ends of the supporting straps exit the adjusting assembly, and a strap inserting direction being defined as the direction from strap inlet end to the strap outlet end; a one-way locking member pivotally coupled to the base member and arranged such that the straps entering the adjusting assembly pass between the base member and one-way locking member, and having an operating portion and a cam effecting portion for increasingly exerting a locking force to the straps; and a biasing member coupled to the base member and the one-way locking member for pivoting the one-way locking member toward the base member such that the cam effecting portion of the one-way locking member may engage with the straps and press them firmly against the base member, and wherein the pivoting direction of the one-way locking member is opposite to the strap inserting direction, and the cam effecting portion of the one-way locking member is adapted such that the locking force exerted by the cam effecting portion to the supporting straps against the base member will increase as the pivoted angle of the one-way locking member increase and eventually reach a level large enough to prevent the supporting straps from moving.
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이 특허에 인용된 특허 (3)
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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