Toggle Wrench Jaw Mechanism for High Torque Reliability
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Solution Overview
Problem
Conventional wrenches face issues with cam portion collapse and abrasion under high torque, leading to inefficient force delivery and complex structures that increase manufacturing costs and assembly difficulties.
Innovation Solution
A wrench design featuring a slidable member with a changeable opening and toggle mechanism, allowing for efficient force transfer and simplified structure, where the toggle member engages in a driving space to apply torque and moves into an evading space for easy jaw movement, reducing manufacturing complexity and enhancing force delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If cam portions are used for engagement between movable jaw and handle, then force delivery to jaws is improved, but the cam portions collapse and wear after prolonged use under high torque
Solution Approach 1:
The patent removes the cam portion mechanism entirely and replaces it with a toggle member that engages directly with the movable jaw. This extraction of the problematic cam mechanism eliminates the collapse and wear issues while maintaining the force delivery function through a simpler direct engagement system.
Solution Approach 2:
Instead of using cam portions that move horizontally under force, the patent inverts the approach by using a toggle member that moves vertically and engages the movable jaw from above. This inversion changes the force transmission path from horizontal cam engagement to vertical toggle engagement, improving reliability while maintaining force delivery.
2Strength
If rivets are secured in slots to connect movable jaw and fixed jaw, then structural connection is improved, but the structure becomes complex and manufacturing costs increase
Solution Approach 1:
The patent merges the connection function into the toggle member itself, which integrates both the structural connection and the force transmission functions. Instead of separate rivets in slots, the toggle member forms a unified structure that connects the movable jaw to the fixed jaw while providing the necessary mechanical advantage, thereby reducing complexity.
Solution Approach 2:
The toggle member serves multiple functions simultaneously: it acts as a structural connector between jaws, provides force transmission, and enables the opening/closing motion. This multi-functionality eliminates the need for separate connection elements like rivets and slots, simplifying the overall structure.
3Force
If cam shaped projection pushes cooperating projections slantedly and downwardly, then force is applied to movable jaw, but only about half the force drives the cooperating projections moving horizontally
Solution Approach 1:
The patent inverts the force application direction from slanted downward push to vertical engagement. The toggle member engages the movable jaw from above and moves vertically, ensuring that essentially all applied force is transmitted horizontally to the jaw rather than being lost to vertical components, thereby improving force efficiency.
Solution Approach 2:
The patent segments the force transmission path into distinct vertical and horizontal components through the toggle mechanism. The vertical motion of the toggle member is converted to horizontal force application on the movable jaw, ensuring maximum force efficiency by eliminating the energy loss present in the slanted cam projection system.
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 design ensures efficient force delivery to the jaws, simplifies the structure, reduces manufacturing costs, and eliminates issues of gear engagement and slippage, resulting in a stable, high-quality wrench with improved usability and unencumbered jaw travel.
Implementation Method 1
The slidable member (3) is formed at the bottom portion of the movable jaw (2) and slidably mounted to the main body (1)
Implementation Method 2
When the handle (6) is at a driving position, the toggle member (61) is located in the driving space (A) and engages against the first end (321) of the first lower enlarged portion (32)
Data Source
AI summary
The present invention provides a wrench which includes a movable jaw, a fixed jaw and a slidable member formed at the bottom portion of the movable jaw and slidably mounted to the main body. In the present invention, a toggle member can be driven to rotate through rotating a handle of the wrench, and the toggle member can smoothly move to and fro between a driving space and an evading space of the slidable member. Whereby, the present invention is simple in structure, has characteristics of smoothly engagedly-cooperative movements between parts of the wrench, so that it can make full use of the force applied by the user and has excellent effects of use.