Multifunction Roofing Hammer Grip Design for Drilling Safety
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Solution Overview
Problem
Roofer's hammers in the state of the art have uncomfortable gripping positions, especially during drilling functions, where fingers come into contact with the metal part surrounding the cutting edge, posing a risk of injury and lacking comfort.
Innovation Solution
A multifunction roofer's hammer design featuring a manual grip handle formed by coating the rod and/or its extension, with specialized gripping zones on either side of the constriction, providing multiple comfortable positions without reducing the cutting edge length, ensuring at least 95% of the hand is on the handle, thus avoiding contact with the metal rod.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the handle is made short to allow finger gripping near the head for drilling functions, then the operator can access the handle in drilling position, but the fingers come into contact with the metal part surrounding the cutting edge causing discomfort and injury risk
Solution Approach 1:
The patent introduces an intermediate material layer (coating or sheath) between the operator's fingers and the metal rod. This intermediary layer eliminates direct contact with the harmful metal surface while preserving the short handle design that enables drilling function accessibility.
Solution Approach 2:
The patent changes the surface parameters of the handle by applying coatings with different material properties (non-metallic, smoother, less hazardous surface). This parameter change maintains the geometric configuration for drilling access while eliminating the harmful contact aspect.
2Productivity
If the cutting edge length is increased to improve slicing performance, then the cutting capability is enhanced, but the handle length must be increased which reduces gripping comfort and increases injury risk
Solution Approach 1:
The patent resolves the contradiction by changing the dimensional relationship between cutting edge and handle through the coating layer. The coating adds a dimensional buffer that decouples the cutting edge length from the effective handle length, allowing long cutting edge to coexist with comfortable gripping zone.
3Ease of operation
If the handle is coated to provide comfortable gripping zones, then user comfort and safety are improved, but the manufacturing complexity increases
Solution Approach 1:
The patent applies composite material construction by combining the metal rod substrate with a non-metallic coating layer. This composite structure provides the beneficial properties of both materials: structural integrity from metal and comfort/safety from the coating, while being manufacturable through standard coating processes.
Data Source
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AI summary
L'invention concerne un marteau (1) de couvreur multifonctions du genre comprenant, au niveau de la tête du marteau, au moins une panne (2) de frappe et une pointe (3) de perforation des éléments de couverture, ladite tête étant prolongée d'une tige (5) plate possédant, sur au moins l'un de ses bords longitudinaux, une arête (6) de coupe servant au tranchage des éléments de couverture, cette tige (5) plate étant munie, à ou au voisinage de son extrémité libre, d'une poignée de saisie manuelle. Ce marteau est caractérisé en ce que la poignée de saisie manuelle présente un étranglement (7) de section cylindrique, formant axe de rotation du marteau lors du passage d'une fonction à une autre et deux zones (8, 9) de préhension disposées l'une (9) d'un côté de l'étranglement (7), entre tête (15) de marteau et étranglement (7), l'autre (9), de l'autre côté dudit étranglement (7).