Hammer Head Handle Assembly with Deflector Surfaces
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Solution Overview
Problem
Heavy-duty hammers often experience issues where the head comes loose from the handle, leading to shock and vibration transmission, potential handle breakage due to over-strikes, and lanyard detachment due to handle damage.
Innovation Solution
The design incorporates a striking head with deflector surfaces to prevent over-strikes, a reinforced lanyard opening, a vibration damping and over-strike protecting sleeve, and a stand surface, along with elongated rods anchoring the handle to the head for enhanced security and grip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the hammer head is made large and heavy for heavy duty work, then the striking power is improved, but the risk of head loosening from handle and handle breakage increases
Solution Approach 1:
The handle is divided into multiple sections with reinforcing rods embedded within it. These rods are distributed throughout the handle length to provide localized reinforcement without adding excessive weight, thereby preventing handle breakage while maintaining the heavy duty striking capability
Solution Approach 2:
The deflectors are pre-positioned on the hammer head at strategic locations before use. These deflectors proactively redirect misstrikes away from the handle, preventing damage before it occurs. The lanyard is also pre-attached to provide immediate safety in case of handle failure
2Reliability
If the handle is made robust to prevent breakage, then the durability is improved, but the vibration transmission to user and weight increase
Solution Approach 1:
The handle is constructed as a composite structure combining the base handle material with embedded reinforcing rods. This composite design provides the necessary strength and durability to prevent breakage while the distributed rod configuration minimizes unnecessary weight addition compared to a fully solid reinforced handle
3Reliability
If the lanyard hole is provided for safety, then the safety feature is added, but the handle becomes a weaker point subject to breakage
Solution Approach 1:
The lanyard is pre-attached to the hammer handle before use, creating a safety mechanism that is already in place. The lanyard material and attachment method are specifically designed to distribute loads and prevent handle breakage at the hole location, proactively addressing the weakness created by the hole
Solution Approach 2:
The lanyard attachment and surrounding handle structure are designed to absorb and distribute stresses that would otherwise concentrate at the lanyard hole. This cushioning effect prevents crack initiation and propagation, protecting the handle from breakage at this vulnerable point
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
This configuration reduces the likelihood of handle breakage, secures the lanyard, and provides improved grip and vibration damping, ensuring the hammer remains effective and durable for heavy use.
Implementation Method 1
a vibration damping and over-strike protecting sleeve at the head end of the handle
Implementation Method 2
a striking head with deflector surfaces for deflecting mis-strikes
Data Source
AI summary
A hammer or other hand tool has a head to which is attached a handle. The handle has a plurality of spring steel rods extending substantially the length of the handle and extending into the head where the rods are affixed by a plate. Spacer plates with holes are positioned at spaced locations along the rods. The rods and spacer plates are encased in a rubber material that forms the outer surface of the handle. The rods and spacer plates at the end of the handle form a reinforced lanyard hole. A collar is formed on the handle adjacent the head. The head of the hammer has angled deflecting pads adjacent the striking faces. A raised rim on the head opposite the handle forms a stand surface to enable the barrel shaped head to stand with the handle projecting upwardly.