Hammer Handle Connection Using Extruded Positioning Protrusions

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Solution Overview

Problem

Existing hammer designs with wooden handles face issues of wear, deformation, and deterioration over time, leading to a weakened fixing effect and potential detachment of the head from the handle.

Innovation Solution

A hammer design featuring a head with a through hole and a transverse hole of increasing width, where the handle's connecting end is extruded to include positioning protrusions that securely engage with the head, preventing disengagement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a traditional fixing structure with a nail plug and nail is used to secure the handle to the head, then the handle can be initially secured to the head, but the fixing effect is lessened over time as the wooden handle wears, deforms and deteriorates

Engineering Contradiction:

Improvefixing effectVSAvoidservice life of handle

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The connection between handle and head is divided into multiple independent positioning protrusions distributed around the circumference, rather than relying on a single fixing point. This segmentation distributes the stress and prevents catastrophic failure from localized wear or deformation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The connection mechanism transitions from a one-dimensional linear insertion (through the through hole) to a two-dimensional radial expansion, where positioning protrusions extend outward to engage with the head's inner surface, creating a broader contact area and more robust connection.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Ease of operation

If the handle connecting end is made with a uniform width to fit through the through hole, then the handle can be easily inserted, but the connection strength is insufficient to prevent detachment

Engineering Contradiction:

Improveease of insertionVSAvoidconnection strength

Core Design Contradiction:

Ease of operationVSStrength

Solution Approach 1:

The handle connecting end features non-uniform local quality with positioning protrusions that create localized engagement points of higher strength, while the overall structure remains compatible with the through hole for easy insertion. The varying cross-sectional profile provides both insertability and connection strength.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The positioning protrusions are pre-formed on the handle connecting end before insertion, so that upon insertion through the through hole and into the head, the protrusions automatically engage with the head's inner surface to create the strong connection, eliminating the need for subsequent assembly steps.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS11491627B2Hammer tool

Publication Date: 2022.11.08 TANG CHOU IND CO LTD

AI summary

A hammer tool includes a head and a handle tightly coupled to the head. The head defines a through hole and a hole connected to the through hole. The hole extends transversely to the through hole. The through hole is of a first width and the hole is of a width greater than the first width. The handle includes a connecting end inserted through the through hole. The connecting end is extruded after inserting through the through hole to include at least one positioning protrusion protruding into the hole. The connecting end is of a second width at where the at least one positioning protrusion is disposed. The second width is greater than the first width.