Hammer Work Tool Multi-Position Retention Collar
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Solution Overview
Problem
Conventional power hammer work tools often fail prematurely due to stress concentrations at retention system engagement points, leading to wasteful costs as they are not adaptable to different hammer designs or work tool designs.
Innovation Solution
A work tool design featuring a collar with a rectangular portion and a flange that includes curved surfaces, providing additional strength and support, along with retention pins that engage the collar's lateral sides to prevent rotation and distribute load, allowing for 90-degree and 180-degree rotation for extended tool life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional retention system engagement features are used, then the work tool is held securely in the hammer, but stress concentrations occur at engagement points leading to premature tool failure
Solution Approach 1:
The work tool is divided into distinct functional segments: a reinforced collar section with lateral sides for retention pin engagement, a shank portion, and a tool tip. The collar is segmented with specific lateral sides that engage retention pins, separating the retention function from the working function and allowing each to be optimized independently.
Solution Approach 2:
The collar is designed with enhanced local properties at critical stress points. The lateral sides of the collar are specifically shaped and positioned to engage retention pins, creating localized reinforcement exactly where stress concentrations would otherwise occur. This local quality enhancement prevents premature failure without compromising overall tool design flexibility.
2Reliability
If conventional retention features are used, then the work tool is secured in the hammer, but the tool geometry is limited and not adaptable to different hammer designs
Solution Approach 1:
The collar with its lateral sides serves multiple functions: it provides retention pin engagement for securing the tool, distributes impact forces across multiple contact points, and maintains tool alignment. This multi-functional design makes the tool adaptable to different hammer configurations while maintaining reliable retention.
3Ease of manufacture
If the work tool is designed with fixed geometry, then manufacturing is simple, but the tool cannot be rotated to extend its useful life
Solution Approach 1:
The collar features asymmetric lateral sides that are specifically shaped to engage retention pins. These asymmetric lateral sides allow the tool to be rotated to different angular positions (e.g., 90-degree or 180-degree rotations) while maintaining proper engagement with the retention pins. This asymmetric design enables extended tool life through rotation without complicating the manufacturing process, as the lateral sides are simply formed as part of the collar structure.
Data Source
AI summary
A work tool for a hammer is disclosed. The work tool may include a first terminal end having a planar surface, and a second terminal end opposite the first terminal end and including a tool tip. The work tool may further include a shank between the first and second terminal ends and including a proximal first shank portion and a distal second shank portion coaxially aligned. The work tool may further include a collar between the first and second shank portions. The collar may include a rectangular portion forming lateral sides of the collar, each of the lateral sides including a planar surface that extends in a direction along an axis of the work tool. The collar may further include a flange having a diameter greater than a diameter of the shank and greater than a length of a lateral side of the rectangular portion.