Pet Retractor Locking Mechanism with Nested Segmented Components
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Solution Overview
Problem
Conventional pet retractors have a locking mechanism that is easily damaged and fails to securely lock the cable or cord, leading to parts shifting and a short working life.
Innovation Solution
A pet retractor design featuring a housing with a chamber, spindle, guide channel, rotary member, lock device with a follower and lever, and a switch member that allows for secure locking and easy operation, using ratchet teeth and a spring biasing element to prevent the leash from being pulled out inadvertently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional locking mechanism is used in the pet retractor, then the device can be manufactured with simpler structure, but the locking mechanism is easily damaged and fails to securely lock the cable after use
Solution Approach 1:
The locking mechanism is divided into separate functional components: a ratchet wheel with teeth for one-way engagement, a pawl for locking, a button for actuation, and a spring for maintaining engagement force. This segmentation allows each component to be optimized for its specific function while improving overall reliability without excessive complexity.
Solution Approach 2:
The locking mechanism components are nested within the housing structure, with the ratchet wheel, pawl, button, and spring arranged in a compact nested configuration. The button is received in a recess, the spring is positioned to engage both the button and housing, and all components are integrated within the existing housing and reel assembly, achieving space-efficient design.
2Stability of the object's composition
If the locking mechanism uses simple engagement structures, then the device complexity is reduced, but the parts move or shift relative to each other and the working life is shortened
Solution Approach 1:
The spring is pre-loaded in the assembled mechanism to continuously exert engagement force on the pawl and ratchet wheel, ensuring stable relative positioning of parts before use. The button is positioned in a recess with the spring pre-compressed, creating initial stability that prevents parts from shifting during operation.
Solution Approach 2:
The spring automatically maintains engagement between the locking components without requiring external adjustment or intervention. The mechanism self-regulates the position and force of the pawl against the ratchet teeth, preventing parts from shifting while maintaining simple operational configuration.
3Reliability
If the locking mechanism is designed for secure locking, then the cable can be reliably held, but the mechanism becomes more complex and harder to operate
Solution Approach 1:
The button is extracted as a separate, easily accessible actuation component that can be independently operated by the user. The button is received in a recess on the housing, allowing the user to easily press it with a finger to release the locking mechanism without having to manipulate complex controls or tools.
Solution Approach 2:
The button serves as an intermediary between the user's manual input and the locking mechanism's engagement state. Pressing the button releases the pawl from the ratchet teeth, providing a simple and intuitive interface for secure locking and releasing the cable.
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
The solution provides a stable and durable locking mechanism that extends the working life of the pet retractor by securely engaging and disengaging the leash, preventing unintended pulling and enhancing user operation.
Implementation Method 1
a spring biasing element engaged between the knob of the lever and the housing for biasing and forcing the knob out through the guide channel of the housing
Implementation Method 2
The rotary member includes a number of ratchet teeth extended from the rotary member for selectively engaging with the hook of the follower and for allowing the follower to anchor or lock the rotary member to the housing selectively
Data Source
AI summary
A pet retractor includes a housing having an anchor, a rotary member rotatably engaged in the housing for engaging with a pet leash, a follower pivotally attached to the housing for engaging with the rotary member, a lever pivotally attached to the housing and having a knob engageable into and out of the housing, the lever includes a guide member engaged with the follower for pivoting the follower relative to the housing when the lever is pivoted relative to the housing and for actuating the hook of the follower to engage with and to be disengaged from the rotary member selectively, and a switch member is slidably engaged with the lever and engageable with the anchor for locking the lever and the follower and the switch member to the housing.