Stroller Frame Limiting Mechanism for Swivel Seat Steering
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Solution Overview
Problem
Existing baby strollers with swivel seats and rotatable handle bars face difficulties in navigation, particularly in narrow spaces, as users often unintentionally lay the handle bar on the front wheel side when changing the seat's direction, leading to steering challenges.
Innovation Solution
A stroller frame with a swivel seat and a limiting mechanism that includes a wheeled frame, seat support, handle bar, and a locking mechanism to prevent the handle bar from rotating towards the front wheel side, ensuring it remains on the rear wheel side during direction changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the handle bar is made rotatable to allow seat direction changes, then the seat can face different directions (forward or backward), but the handle bar may be unintentionally laid on the front wheel side causing steering difficulty
Solution Approach 1:
A limiting mechanism acts as an intermediary between the handle bar and the front wheel side, preventing the handle bar from rotating beyond a safe position. This mechanism includes a stopper or guide structure that physically blocks the handle bar from moving to the front wheel side, thus maintaining steering capability while allowing seat direction changes.
Solution Approach 2:
The limiting mechanism applies preliminary anti-action by pre-establishing a physical barrier that prevents the handle bar from rotating to an unsafe position. Before the user can accidentally lay the handle bar on the front wheel side, the limiting structure intercepts the motion, thereby preventing the harmful steering condition from occurring.
2Adaptability or versatility
If the handle bar is rotated to change seat direction, then the seat can be reoriented, but navigation in narrow spaces becomes difficult when handle bar is on front wheel side
Solution Approach 1:
The limiting mechanism serves as an intermediary that ensures the handle bar remains on the rear wheel side during seat direction changes. This prevents the handle bar from interfering with front wheel steering, thereby maintaining ease of navigation in narrow spaces while still allowing seat reorientation.
Solution Approach 2:
The limiting mechanism performs preliminary action by pre-positioning the handle bar on the rear wheel side through structural constraints. This preliminary positioning ensures that subsequent navigation operations in narrow spaces are not compromised, while the seat can still be reoriented as needed.
3Reliability
If the handle bar is made lockable for direction fixing, then the handle bar can maintain position, but the mechanism complexity increases
Solution Approach 1:
The limiting mechanism is designed to be self-service by using the user's own handle bar rotation action to engage or disengage the locking function. When the user rotates the handle bar to change seat direction, the limiting mechanism automatically locks or unlocks based on the rotation position, eliminating the need for separate locking controls and reducing overall system complexity.
Solution Approach 2:
The limiting mechanism merges the positioning and locking functions into a single integrated structure. Rather than having separate locking components, the limiting structure itself provides both the positional constraint and the locking effect, thereby maintaining reliability while minimizing device complexity.
Data Source
AI summary
A stroller frame includes a wheeled frame, a seat support, a handle bar and a limiting mechanism. The wheeled frame has a front wheel side and rear wheel side. The seat support is pivotally mounted atop the wheeled frame about a seat support axis, and selectively may have a forward facing direction and a rearward facing direction positioned by a locking member. The handle bar is pivotally and lockably connected to the seat support about a handle bar axis and associated with the locking member for interchanging the facing directions of the seat support. The limiting mechanism is associated between the wheeled frame, the seat support and the handle bar, for preventing the handle bar from rotating about the handle bar axis from the upright position to a position extending toward the front wheel side while tilting up the handle bar and rotating the seat support for interchanging the facing directions.