Rotary Toe Strap Pedal Fit Adjustment for Secure Foot Retention

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Solution Overview

Problem

Existing pedal systems for securing a user's foot to a pedal are difficult to adjust, require training, are not intuitive, and do not provide precise fit or secure connection, leading to safety concerns and reduced pedaling efficiency.

Innovation Solution

A rotatable adjuster mechanism that allows for easy and precise adjustment of the toe strap length, enabling secure and comfortable foot retention with a quick release mechanism.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a conventional buckle is used to adjust the toe strap length, then the strap length can be adjusted, but the buckle is difficult to reach and operate while seated on the bicycle

Engineering Contradiction:

Improveease of strap adjustmentVSAvoidcomplexity of adjustment mechanism

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent repositions the adjustment mechanism from a side-mounted buckle to a top-mounted rotary dial on the toe strap. This dimensional change places the adjustment control within easy reach of the user's hand while seated, eliminating the accessibility problem of conventional buckles.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent replaces the traditional buckle-and-strap mechanical system with a rotary dial mechanism that rotates to adjust strap length. This substitution provides more intuitive operation through rotational motion rather than threading and buckling, significantly improving ease of operation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Measurement precision

If a peg and hole adjustment arrangement is used, then the strap length can be fixed at discrete positions, but the adjustment is not infinitely variable and limits effective length adjustment to one of several discrete lengths

Engineering Contradiction:

Improveprecision of strap length adjustmentVSAvoidrange of adjustable lengths

Core Design Contradiction:

Measurement precisionVSAdaptability or versatility

Solution Approach 1:

The patent transitions from discrete peg-and-hole positioning to continuous rotary dial adjustment. The rotary mechanism allows the strap length to be varied continuously across a wide range, providing both precise adjustment and unlimited adaptability to different foot sizes and preferences.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces the static, fixed-position peg system with a dynamic rotary dial that can be rotated to any position. This dynamic adjustment mechanism enables continuous variation of strap length rather than being constrained to predetermined discrete lengths.

Inventive Principle:

Principle #15Dynamics

3Reliability

If hook-and-loop closure is used for strap adjustment, then the strap can be adjusted by tearing and re-positioning, but the adjustment is difficult and clumsy and the closure wears out after several adjustments

Engineering Contradiction:

Improvedurability of closureVSAvoidease of length adjustment

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent replaces the hook-and-loop closure system with a rotary dial adjustment mechanism. This substitution eliminates the wear and reliability issues of hook-and-loop materials while providing more precise and easier adjustment through rotational control rather than tearing and repositioning.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The rotary dial mechanism pre-positions the strap at the desired length through rotation before the strap is secured. This preliminary adjustment action allows for precise length setting without the need for repeated tearing and repositioning that degrades hook-and-loop closures over time.

Inventive Principle:

Principle #10Preliminary action

4Device complexity

If toe clip is omitted and only toe strap is included, then the arrangement is simpler, but no forward positioning limit or control is provided between the foot and the platform

Engineering Contradiction:

Improvesimplicity of strap arrangementVSAvoidfoot positioning control

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent designs the toe strap system to perform multiple functions: it provides both the retaining function traditionally associated with toe clips and the securing function of toe straps. The adjustable rotary dial system enables the single strap arrangement to achieve reliable foot positioning control without requiring a separate toe clip component.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12509180B2Foot retention system for a pedal

Publication Date: 2025.12.30 CUOMO STEPHEN MICHAEL

AI summary

A foot retention system including: a pedal having a pedal platform; a strap having a first base portion, a second base portion and a loop portion between base portions; and a rotary adjuster connected to said strap. The first base portion and said second base portion are retained to the pedal platform and the loop portion is vertically spaced from the pedal platform. The strap and pedal platform defines an opening to receive a user's foot and the rotary adjuster is rotatable about a rotary axis to adjust the perimeter length of the opening.