Stroller Caster Lock Mechanism for Smooth Swivel Switching
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Solution Overview
Problem
The existing caster lock mechanisms in strollers can experience resistance and operational inefficiencies due to the elongated lock pin contacting the hole walls, leading to difficulties in smoothly locking and unlocking the caster wheels.
Innovation Solution
A wheeled childcare device with a caster mechanism incorporating a caster lock member, first and second biasing members, and a moving member, where the biasing members operate in opposite directions to smoothly transition between lock and unlock positions, facilitated by an actuation mechanism on a push bar.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an elongated lock pin is used to lock and unlock the wheel mounting body, then the caster wheel can be restricted or permitted to swivel, but the lock pin may contact the wall surface of the elongated hole causing resistance and preventing smooth locking and unlocking
Solution Approach 1:
A moving member is introduced as an intermediary component between the lock pin and the operation mechanism. This moving member translates the rotational operation of the operation mechanism into linear motion that moves the lock pin between locked and unlocked positions, preventing direct contact between the lock pin and the elongated hole wall surface during operation.
Solution Approach 2:
Instead of moving the lock pin directly through the elongated hole by pushing or pulling it linearly, the invention inverts the approach by using a rotating operation mechanism that, through the moving member, converts rotational motion into the necessary linear displacement of the lock pin. This indirect approach avoids friction and contact resistance.
2Adaptability or versatility
If the lock pin is movable in its longitudinal direction within an elongated hole, then locking and unlocking can be achieved, but resistance occurs between the lock pin and the hole wall surface
Solution Approach 1:
The invention introduces a moving member that dynamically translates between rotational and linear motion, allowing the lock pin to move smoothly between positions without being constrained by the elongated hole geometry. This dynamic translation mechanism reduces friction and contact resistance while maintaining the essential locking and unlocking functionality.
3Strength
If the elongated lock pin is used for locking, then the caster mechanism can be secured, but the contact with the hole wall surface creates operational resistance
Solution Approach 1:
The moving member serves as a mediator that applies force to the lock pin to move it into the locked position without requiring the lock pin to slide against the elongated hole wall surface. This intermediary mechanism maintains strong locking engagement while eliminating operational resistance during the locking and unlocking process.
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
Enhances the operability of the stroller by ensuring smooth locking and unlocking of caster wheels, improving user experience and functionality.
Implementation Method 1
The first biasing member is configured to bias the caster lock member toward the lock position
Implementation Method 2
the wheeled childcare device further includes a second biasing member configured to bias the moving member toward the second position
Data Source
AI summary
A wheeled childcare device includes: a body frame; a caster mechanism including a caster holding member and a caster pivot member and configured to allow a front wheel or a rear wheel to swivel; a caster lock member configured to assume a lock position and an unlock position; a first biasing member configured to bias the caster lock member toward the lock position; and a moving member provided in the caster holding member and movable between a first position and a second position. The first position is a position in which the caster lock member is moved to the lock position, and the second position is a position in which the caster lock member is moved to the unlock position.