Adjustable Wrench Jaw Ratio for Tight Space Access
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Solution Overview
Problem
Existing adjustable wrenches face issues with partial engagement with screwed parts in tight spaces, risking damage and hindering rotation due to bulging slide rods, and have limited angular range per twist for efficient operation.
Innovation Solution
An adjustable wrench design with a handle, head portion, and adjusting unit featuring a fixed jaw and movable jaw with a slide rod, where the ratio of maximal outer width to maximal inner width is optimized to 150%-210%, 150%-200%, or 150%-175% to facilitate insertion and twisting within limited spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the wrench is designed with a shrinking opening for easy access to screwed parts in tight spaces, then the wrench can be inserted into limited spaces, but the engagement between the jaws and screwed part becomes partial which is risky and may damage the screwed part
Solution Approach 1:
The wrench employs an adjustable jaw mechanism that allows dynamic adaptation of the jaw opening width to match different screwed part sizes. The movable jaw can be positioned along the slot to achieve full engagement with various尺寸的 screwed parts, ensuring reliable contact while maintaining access to tight spaces
Solution Approach 2:
The invention changes the geometric parameter of the jaw opening by allowing the movable jaw to slide along the slot. This enables the opening width to be adjusted according to the size of the screwed part, ensuring optimal engagement without compromising access to confined areas
2Adaptability or versatility
If the slide rod of the movable jaw is extended to adjust the clip size, then the wrench can accommodate various screwed part sizes, but the slide rod may bulge out too much which hinders the rotation of the wrench around the screwed part
Solution Approach 1:
The slot is designed with an asymmetric profile where the width varies along its length. The slot is narrower at the ends and wider in the middle section, allowing the slide rod to extend sufficiently for adjustment while preventing excessive protrusion that would interfere with rotation. This asymmetric geometry optimizes both adjustability and rotational capability
Solution Approach 2:
The invention addresses the conflict by utilizing the longitudinal dimension of the slot to control the lateral protrusion of the slide rod. By designing the slot with varying width along its length, the system manages the trade-off between adjustment range and rotational clearance in a different dimensional approach
3Ease of operation
If the ratio of outer width to inner width is reduced to facilitate insertion into limited spaces, then the wrench can access tight areas, but the angular range per twist becomes too small for efficient operation
Solution Approach 1:
The adjustable jaw mechanism allows the wrench to dynamically adapt its effective working width. By adjusting the jaw opening to match the minimum required size for the specific screwed part, the wrench achieves optimal insertion capability while maintaining sufficient angular range for efficient operation, as the jaw width is optimized for each specific application rather than being fixed at a conservative dimension
Data Source
AI summary
An adjustable wrench comprises a handle, a head portion formed at one end of the handle, and an adjusting unit. The head portion further includes a fixed jaw and a movable jaw, which forms a clip surface for clipping a screwed part. The movable jaw is provided with a slide rod at a bottom side thereof that is retained along a slot extended transversely across the head portion. The adjusting unit controls the displacement of the movable jaw along the slot. The ratio of a maximal outer width to a maximal inner width is selected from three ranges so that the operation of the wrench within a limited space can be facilitated, attaining the goal of quickly loosening the screwed part.