Three-Claw Adjustable Wrench for Secure Bolt Grip
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Solution Overview
Problem
Existing adjustable wrenches lack the gripping ability of socket and fixed end wrenches, often leading to stripping of bolt heads due to insufficient contact area.
Innovation Solution
An adjustable wrench design featuring three bolt claws - a lower, central, and upper claw - that form a fitted opening encircling two sides and three corners of a hexagonal bolt head, with a jackscrew mechanism allowing for adjustable fit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If an adjustable wrench uses only two bolt claws to contact the bolt head, then the device complexity is reduced and ease of manufacture is improved, but the contact area with the bolt head is insufficient leading to stripping of the bolt corners
Solution Approach 1:
The wrench head is divided into three separate bolt claws (upper, central, and lower) that can be independently positioned along the jaw. Each claw can contact a different portion of the bolt head, effectively segmenting the contact points to increase overall contact area while maintaining an adjustable mechanism.
Solution Approach 2:
The bolt claws are arranged not only along the opening width but also along the jaw length, creating a multi-dimensional contact pattern. This allows the claws to contact multiple sides and corners of the hexagonal bolt head, transitioning from a single-plane contact to a multi-plane contact configuration.
2Adaptability or versatility
If an adjustable wrench is designed with simple adjustment mechanism, then ease of operation is improved, but adaptability to different bolt sizes and shapes is limited
Solution Approach 1:
The wrench is designed with three adjustable bolt claws that can be positioned to contact various sides and corners of different bolt head shapes (hexagonal, square, rounded). This universal design allows a single wrench to adapt to multiple bolt types and sizes without requiring different specialized tools.
Solution Approach 2:
The bolt claws are designed to be dynamically adjustable along the jaw, allowing the user to reposition them according to the specific bolt size and shape being worked on. This dynamic adjustment capability provides versatility while maintaining operational simplicity through the use of a ratcheting mechanism.
3Reliability
If the wrench contacts only two opposing sides of the hexagonal bolt, then the device complexity is minimized, but the gripping ability and reliability are reduced due to insufficient contact points
Solution Approach 1:
Different portions of the bolt head receive different levels of contact and support. The three bolt claws are strategically positioned to contact specific sides and corners of the hexagonal bolt head, providing localized support where it is most needed to prevent slipping and stripping while maintaining overall grip stability.
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 provides a tighter fit with increased contact area, reducing the likelihood of bolt head stripping and enhancing the wrench's ability to grip bolts securely.
Implementation Method 1
A compression spring on the jack-screw biases the adjustment knob-nut and jack-screw in a distal direction relative to the terminal end of the wrench.
Implementation Method 2
A jack-screw is coupled to the handle. A tighten handle is coupled to an adjustment knob-nut. The adjustment knob-nut is rotationally coupled to the jack-screw.
Data Source
AI summary
An adjustable wrench is shown which includes a handle with a terminal end and a grip end, the terminal end defining a lower bolt claw. A tighten handle is coupled to an adjustment knob-nut. The adjustment knob is-nut is rotationally coupled to a jackscrew with the jackscrew being slidably coupled to the handle and is moveable to control the movement of associated upper and central bolt claws. The upper, central and lower bolt claws are adjustable to different sized bolt heads upon terminal or distal movement of the jackscrew. The central bolt claw fits through a slot in the upper bolt claw, the slot defining an inclined ramp surface, with movement of one claw being coupled to movement of the other claw. The claws move cooperatively in reaction to the stationary, lower bolt claw to form a tightly fitted surface for the bolt head. The jackscrew is manually adjusted during adjustment of the wrench to a bolt. Additionally, the jackscrew is distally biased within a slotted opening of the handle and can be moved forward to forcefully grip a bolt head, using the force multiplying tighten lever.