Stroller Backrest Recline Adjustment Mechanism
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Solution Overview
Problem
Conventional backrest recline adjustment devices for strollers are inconvenient to operate, requiring parents to bend down and are unstable in engagement, making it difficult to adjust the backrest inclination.
Innovation Solution
A backrest recline adjustment device featuring a stationary seat, a rotary seat with a cam mechanism, and a resilient component, allowing for one-handed operation by moving the rotary seat from a securing to a releasing position using a driving component, ensuring stable engagement and easy adjustment of the backrest inclination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the backrest recline adjustment device is disposed at the bottom of the backrest unit, then the structure is compact, but parents have to bend down to operate it, resulting in inconvenience
Solution Approach 1:
The patent relocates the adjustment mechanism from the bottom of the backrest unit to the top portion, changing the spatial dimension of operation. This allows parents to operate the mechanism while standing or sitting upright, eliminating the need to bend down and improving ease of operation without significantly increasing device complexity.
2Reliability
If conventional abutment teeth and notches are used for engagement, then the structure is simple, but the engagement is relatively unstable
Solution Approach 1:
The patent employs cam surfaces with curved geometries instead of conventional linear abutment teeth and notches. The cam mechanism uses curved contact surfaces that provide more stable engagement through progressive contact, distributing forces more effectively and preventing disengagement under vibration or minor shocks, thereby improving reliability while maintaining reasonable structural complexity.
3Ease of operation
If the second pivot member is moved away from the first pivot member to disengage abutment teeth, then the backrest can be adjusted, but the operation requires two hands and is inconvenient
Solution Approach 1:
The cam mechanism is designed to be self-latching and self-positioning. When the cam surface is actuated, it automatically engages with the corresponding cam surface on the pivot member, providing secure locking without requiring manual intervention or two-handed operation. The mechanism serves itself by using the motion of one component to automatically position and lock the other, simplifying operation while maintaining stability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables easy, one-handed operation and stable adjustment of the backrest inclination, enhancing user convenience and stability compared to conventional devices.
Implementation Method 1
The resilient component is disposed for biasing the rotary seat toward the stationary seat
Implementation Method 2
The rotary seat further has a first cam surface that is formed in the groove. The driving component is disposed slidably in the groove of the rotary seat and is provided with a second cam surface abutting slidably against the first cam surface
Data Source
AI summary
A backrest recline adjustment assembly includes a stationary seat, a rotary seat, and a driving component. The stationary seat is connected to a stroller frame, and is provided with a first positioning unit. The rotary seat is connected to a backrest unit and has a second positioning unit, a groove formed thereon, and a first cam surface formed in the groove. The driving component is disposed in the groove of the rotary seat and provided with a second cam surface. The driving component is movable to drive sliding movement of the second cam surface relative to the first cam surface, thereby moving the rotary seat against biasing action of a resilient component from a securing position, where the rotary seat is positioned relative to the stationary seat, to a releasing position, where the rotary seat is rotatable relative to the stationary seat.