Adjustable Wrench Movable Jaw Guide System Hex Fastener
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Solution Overview
Problem
Conventional wrenches often struggle to efficiently engage and apply torque to bolts or nuts with complex head geometries, particularly hexagonal or multi-sided fasteners, as they typically only contact one or two sides, leading to inefficiencies in tightening or loosening operations.
Innovation Solution
The design of a wrench that includes a movable jaw with angled faces forming a 120-degree angle, which can be adjusted to engage three sides of a hexagonal bolt or nut, along with a guide system allowing the jaw to move at a specific angle relative to the fixed jaw, ensuring secure contact and applying pressure across multiple flats of the fastener head.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional wrench contacts only one or two sides of a hexagonal bolt or nut, then the device complexity is reduced, but the torque transfer efficiency and reliability deteriorate
Solution Approach 1:
The movable jaw is segmented into multiple engagement surfaces (first jaw face and second jaw face at different angles) to contact multiple sides of the fastener, distributing the torque transfer across several contact points rather than a single point
Solution Approach 2:
The guide mechanism introduces a new dimensional constraint by controlling the movable jaw's movement along a specific angular path, enabling three-dimensional engagement geometry that contacts multiple fastener sides simultaneously
2Manufacturing precision
If the movable jaw is constrained to move along a fixed path, then the manufacturing precision is improved, but the adaptability to different fastener sizes deteriorates
Solution Approach 1:
The guide mechanism is designed with adjustable parameters that allow the movable jaw's movement path to be dynamically adapted to different fastener sizes while maintaining precise angular control through the guide's geometric constraints
Solution Approach 2:
The guide's geometric parameters (angles, dimensions) can be modified to change the jaw's movement characteristics, enabling the same basic mechanism to precisely engage different fastener sizes by adjusting these parameters
3Reliability
If the movable jaw engages three sides of a hexagonal fastener, then the reliability of torque application is improved, but the device complexity increases
Solution Approach 1:
The guide mechanism acts as an intermediary component that translates simple user input into complex multi-point engagement motion, mediating between the user's torque application and the multi-sided engagement requirement without requiring direct complex mechanisms in the jaw itself
Solution Approach 2:
The guide mechanism serves multiple functions simultaneously: it controls the jaw's movement path, maintains proper engagement geometry, and enables adaptation to different fastener sizes, reducing the need for separate specialized components
Data Source
AI summary
A wrench, connectable to a standard square shaped extension, has a wrench head with opposed jaw faces which together define a plane that lies perpendicular to the respective jaw faces. A standard square shaped extension socket is affixed to the wrench head, where a standard square shaped extension can be inserted into the standard extension socket, along a direction that is non-orthogonal to the transverse plane. The standard extension socket can be attached to a frame of the wrench head, or to a rotatable guide which controls movement the opposed jaw face which is movable.