Wrist Loop Leash Structure to Prevent Slip and Rotation Injury
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Solution Overview
Problem
Existing pet leashes require both hands for operation, leading to potential detachment during sudden pet movements, and can cause wrist injuries due to rubbing or rotation against the wrist.
Innovation Solution
A leash design with a ring formed by winding the rope with two or more turns, featuring a through hole for inserting the wrist, allowing the rope to slide and preventing detachment and wrist injuries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the leash is wound around the wrist without a gap, then the possibility of preventing the leash from being easily removed from the wrist is high, but the rope may be rotated around the wrist while rubbing against the wrist causing injury
Solution Approach 1:
The patent applies local quality by providing a gap between the rope and wrist at the tightening portion, while maintaining direct contact at other portions. This localized difference in contact quality prevents both detachment (through contact at most areas) and rotation (through the gap at the tightening area), resolving the contradiction between retention and injury prevention.
2Ease of operation
If the leash is tightened to the wrist, then the leash can be secured for hands-free operation, but time and labor are required for adjusting and fixing the length
Solution Approach 1:
The patent applies self-service by designing the leash to automatically tighten and secure to the wrist through friction and the gap mechanism, without requiring manual adjustment or fixing components. The user simply wraps the rope around the wrist and pulls to tighten, and the system self-regulates the tightening state, eliminating the time-consuming adjustment and fixing processes.
3Reliability
If the rope is wound tightly around the wrist, then detachment is prevented, but the tightened state loosens at the adjustment portion causing rotation and injury
Solution Approach 1:
The patent creates local quality differentiation by having the rope contact the wrist at most portions while maintaining a gap at the tightening portion. This causes the tightening force to be distributed along the rope-wrist contact areas rather than concentrating at the adjustment portion, preventing the loosening and rotation that would otherwise occur.
4Ease of operation
If the leash requires one hand to grasp during operations, then the leash can be controlled, but the owner cannot perform operations with both hands freely
Solution Approach 1:
The patent applies self-service by designing the leash to automatically attach to and secure on the wrist without requiring manual grasping. Once attached, the leash remains controlled through the friction and gap mechanism while freeing both hands for operations, achieving both control and hands-free flexibility simultaneously.
Data Source
AI summary
A leash including: a rope having a shape of two or more rings at an end to be grasped by the owner; and a structure including a through hole into which a part of the rope is inserted for keeping a part of the two or more rings, where one end to the other end of the two or more rings are continuously connected, each of the two or more rings of the rope has the part inserted into the through hole, an inside size of a ring formed by the structure and a freely movable portion of one of the two or more rings of the rope not inserted into the through hole of the structure can be reduced by pulling the rope from another end to be connected to the pet, and the inside size can be enlarged by loosening the rope.