Stroller Push Bar Mechanism for Automatic Caster Locking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wheeled childcare devices, such as strollers, require complex structures and many parts for manually or automatically locking and unlocking caster wheels, which is cumbersome for operators.
Innovation Solution
A wheeled childcare device with a simplified structure that includes a body frame, caster mechanism, caster lock member, displacement member, and operation mechanism, allowing for automatic locking and unlocking of front and rear caster wheels through a push bar switchable between positions, utilizing biasing members and an operation mechanism to displace caster lock members between lock and unlock positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual operation of caster locks is implemented, then locking/unlocking function is achieved, but operator burden increases and operation becomes cumbersome
Solution Approach 1:
The caster lock mechanism automatically locks and unlocks based on the push bar position without requiring manual operation. The system serves itself by using the natural movement of the push bar during stroller configuration changes to trigger the locking/unlocking of caster wheels, eliminating the need for separate manual lock operations.
Solution Approach 2:
The caster wheels are locked or unlocked in advance based on the push bar position before the operator needs to move the stroller. By automatically setting the caster lock state according to whether the push bar is in the rear-facing or front-facing position, the system prepares the wheels in the correct state beforehand, eliminating the need for separate locking/unlocking steps.
2Ease of operation
If automatic four-wheel mechanism is implemented, then manual operation is eliminated, but structure complexity increases and number of parts increases
Solution Approach 1:
The caster locking function is merged with the existing push bar positioning mechanism. Instead of creating a separate automatic locking system, the invention utilizes the natural movement and position of the push bar (which already exists for switching between rear-facing and front-facing modes) to control the caster lock state, combining two functions into one integrated system.
Solution Approach 2:
The push bar serves multiple functions: it controls the orientation of the stroller (rear-facing or front-facing) and simultaneously controls the locking/unlocking of the caster wheels. By making the push bar a multi-functional component, the invention eliminates the need for separate locking mechanisms while maintaining automatic operation capability.
3Reliability
If complex locking structure is used, then reliable locking/unlocking is achieved, but manufacturing cost increases and assembly difficulty increases
Solution Approach 1:
The locking mechanism is merged with the push bar assembly, using existing structural components rather than adding separate locking parts. This integration reduces the total number of parts that need to be manufactured and assembled, simplifying production while maintaining the reliability of the locking function through the unified design.
Data Source
AI summary
A wheeled childcare device includes: a body frame; a front-wheel caster mechanism and a rear-wheel caster mechanism each including a caster holding member and a caster pivot member and each configured to allow a front wheel or a rear wheel to swivel; a front-wheel caster lock member and a rear-wheel caster lock member each configured to assume a lock position and an unlock position; a front-wheel-side displacement member and a rear-wheel-side displacement member each configured to be displaced between a first position corresponding to the lock position of the caster lock member and a second position corresponding to the unlock position of the caster lock member, according to switching of the position of a push bar; and an operation mechanism provided on the push bar and configured to operate the displacement member to switch the displacement member from the first position to the second position.