Tandem Stroller Vertical Seat Configuration
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Solution Overview
Problem
Conventional tandem strollers have a lengthy profile due to the need for a large distance between front and rear seats to ensure comfort for the child on the rear seat, resulting in an increased total length.
Innovation Solution
A tandem stroller design featuring a frame with a side rod unit, front and rear leg rods, and a push rod, where the front and rear seats are positioned to minimize the front-to-rear length, with adjustable backrests and a canopy that allows for simultaneous adjustment and folding, enabling a compact configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large distance is maintained between front and rear seats to ensure comfort for the child on the rear seat, then comfort is improved, but the total length of the stroller in the front-to-rear direction is increased
Solution Approach 1:
The patent repositions the rear seat from a horizontal arrangement to a vertical arrangement, placing it above the front seat plate. This dimensional change allows the rear seat to be positioned closer to the front seat in the front-to-rear direction while maintaining comfort through vertical spacing and structural support, thereby reducing the overall length of the stroller.
Solution Approach 2:
The rear seat is positioned above and partially overlapping the front seat plate area, creating a nested configuration where the rear seat utilizes the vertical space above the front seat. This nesting arrangement reduces the horizontal footprint and front-to-rear length while providing adequate space for both children.
2Length of moving object
If the stroller is designed with a compact configuration to reduce length, then the total length is reduced, but the comfort of the child on the rear seat may be compromised
Solution Approach 1:
By moving the rear seat to a vertical position above the front seat plate, the design achieves compact horizontal dimensions while maintaining comfort through vertical separation. The rear backrest extends upward to provide proper support, ensuring the child's comfort is not compromised despite the reduced length.
Solution Approach 2:
The design provides localized comfort features including a rear backrest that extends upward from the rear seat plate to support the rear child's back, and a front backrest that extends upward from the front seat plate. These localized structural elements ensure comfort is maintained in specific areas even as the overall stroller length is reduced.
Data Source
AI summary
A tandem stroller (1) includes a frame (11), a pair of front and rear seats (15, 16) disposed on the frame (11), a plurality of front wheels (12), and a plurality of rear wheels (13). The frame (11) includes a side rod unit (111), a pair of front leg rods (112) connected to the side rod unit (111), a pair of rear leg rods (113) connected to the side rod unit (111), and a push rod (14). The front and rear wheels (12, 13) are disposed respectively on the front and rear leg rods (112, 113). The push rod (14) is connected to the rear leg rods (113). The front seat (15) includes a front seat plate (151) disposed on the frame (11), and a front backrest (152) connected to and disposed behind the front seat plate (151). The rear seat (16) includes a rear seat plate (161) disposed behind the front seat (15) and above the front seat plate (161), and a rear backrest (162) connected to and disposed in front of the rear seat plate (161).