Stroller Wheel Locking Structure With One-Step Pedal Switching

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Solution Overview

Problem

Existing stroller wheel locking mechanisms require two actions (moving up and down) to lock and unlock the wheels, which is inconvenient and prone to damage or staining the user's shoes.

Innovation Solution

An intermittent movement device with a housing, a driving member, engagement teeth, and an operating member that allows for one-directional locking and unlocking of the wheels by stepping on a pedal, eliminating the need for two separate actions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a traditional wheel locking mechanism with a parking pedal is used, then the wheels can be locked and unlocked, but two separate actions (moving up and moving down) are required which are inconvenient and prone to damage or staining the user's shoes

Engineering Contradiction:

Improveconvenience of wheel locking operationVSAvoidnumber of actions required for locking mechanism

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent inverts the traditional two-directional pedal operation into a one-directional operation. Instead of requiring the pedal to be pressed down and then lifted up separately, the pedal is designed to be pressed down once to trigger both locking and unlocking functions through the intermittent movement mechanism. This inversion of the operational sequence eliminates the need for two separate actions and prevents shoe damage or staining.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent employs periodic action through the intermittent movement device that converts the continuous pressing motion into discrete locking cycles. Each press of the pedal initiates a periodic cycle where the driving member rotates intermittently to engage or disengage the locking slots,实现ing both locking and unlocking functions through repeated periodic motion rather than requiring two distinct manual actions.

Inventive Principle:

Principle #19Periodic action

2Productivity

If the parking pedal requires two actions (up and down movement) to operate, then the locking mechanism can function, but it increases the complexity of operation and time required

Engineering Contradiction:

Improvespeed of wheel locking operationVSAvoidtime required for locking and unlocking operations

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by pre-configuring the intermittent movement mechanism and engagement teeth on the driving member to automatically execute the locking sequence. When the pedal is pressed once, the mechanism is already prepared to rotate the driving member through the correct sequence of positions, engaging the locking slots without requiring the user to perform multiple separate actions. This preliminary setup of the mechanism enables rapid operation and reduces time loss.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If a simple pedal mechanism is used, then the structure remains simple, but it cannot achieve reliable one-directional locking and unlocking functionality

Engineering Contradiction:

Improvereliability of one-directional lockingVSAvoidcomplexity of locking mechanism structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies dynamics by making the driving member and engagement teeth movable rather than fixed. The driving member is designed to rotate intermittently in response to pedal pressure, and the engagement teeth are positioned to dynamically engage or disengage from the locking slots based on the rotation position. This dynamic design enables reliable one-directional locking functionality while maintaining relatively simple overall structure through motion-based control rather than complex mechanical linkages.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20250187645A1Intermittent movement device, wheel locking structure and stroller

Publication Date: 2025.06.12 WONDERLAND SWITZERLAND AG

AI summary

An intermittent movement device according to the application includes: a housing; a driving member, disposed in the housing, and capable of rotating around a first axis; a plurality of engagement teeth, circumferentially distributed on the driving member based on the first axis; an operating member, capable of performing reciprocating movement between an initial position and an acting position with respect to the driving member around the first axis; wherein when the operating member moves from the acting position to the initial position, the operating member passes over one of the engagement teeth to return from the acting position to the initial position, and the driving member does not rotate with the operating member. The application further discloses a wheel locking structure and a stroller.