Tool Holding Device Base Block Connection Strength
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Solution Overview
Problem
The existing tool holding devices for road planers face issues with the connection strength between the base and the block, leading to frequent replacements and high costs due to the stress from counterforces during operation, causing wear and potential breakage.
Innovation Solution
A tool holding device design featuring a base with a receiving portion defined by a shoulder wall and a countering wall at a non-obtuse angle, a dovetail track, and a retaining portion to enhance mechanical strength, along with a groove to prevent fragment accumulation, ensuring secure attachment and prolonged usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the base and block are connected through welding and fastening members, then the tool holding device can be assembled, but the connection strength is insufficient under counterforce stress
Solution Approach 1:
The base is divided into multiple functional walls (shoulder wall, countering wall, rear wall) that work together to distribute and bear the counterforce. The block is segmented into holding portion, handle, and retaining portion, each serving specific functions in the force transmission path. This segmentation allows the structure to better withstand multidirectional stresses.
Solution Approach 2:
The connection structure combines multiple fastening members (screws, bolts) with the base-block interface to create a composite fastening system. The dovetail track and protrusion combination creates a composite mechanical interlock that enhances overall connection strength beyond what single fastening methods could achieve.
2Ease of operation
If the block is secured with fastening members, then the tool can be held, but the block wears out or breaks after long operation due to stress
Solution Approach 1:
The dovetail track and protrusion structure provides beforehand cushioning by creating a mechanical interlock that prevents excessive movement and stress concentration on the fastening members. The retaining portion protruding against the base surface provides prior structural support and stress distribution before the block can wear out or break under operational loads.
Solution Approach 2:
The angle between the shoulder wall and countering wall is changed to a non-obtuse angle (less than 90 degrees), which fundamentally changes the force distribution parameters. This angular parameter change directs counterforce more effectively along the base structure, reducing stress on the block-fastening member connection and extending operational life.
3Productivity
If fragments accumulate during operation, then the chisel performance deteriorates, but no structure is provided to remove fragments
Solution Approach 1:
The groove structure extracts harmful fragments from the working area by providing a dedicated pathway for fragment removal. The groove takes out accumulated material that would otherwise interfere with chisel operation, maintaining productivity by continuously clearing the harmful byproducts of the cutting process.
Data Source
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AI summary
A tool holding device is disclosed, and the tool holding device includes a base (100), a block (200), and a fastening member (300) for securing the block. The base (100) includes a receiving portion (130) defined between a countering wall (120) and a shoulder wall (110), a surface (150) defined adjacent to the shoulder wall perpendicularly and away from the countering wall, a penetrated hole (170) defined on the countering wall, and a positioning hole (180) communicating with the penetrated hole. The block includes a holding portion (210) held in the receiving portion, a handle (220) received in the penetrated hole, and a holding hole (250) for holding a chisel. The countering wall and the shoulder wall define an angle less than or equal to 90 degrees. Therefore, the counterforce bearing of the base and block are both enhanced to raise the strength of the tool holding device.