Carbide Inserts for Fastener Tool Nose Assembly Wear
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Solution Overview
Problem
Power-assisted fastener driving tools, particularly pneumatic nailers, face wear issues on the work contact element when used with abrasive materials like asphalt shingles, leading to reduced durability and increased manufacturing complexity and cost.
Innovation Solution
Incorporating wear-resistant carbide inserts positioned along the alignment edge of the work contact element, specifically designed to minimize contact with the shingles and maintain structural integrity, while allowing for effective alignment and fastening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wear-resistant inserts are incorporated into the contact surface of the work contact element, then wear resistance is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent applies local quality by incorporating wear-resistant inserts specifically at the contact surface and front side surface of the work contact element where wear occurs during roofing applications. This localized approach provides wear resistance exactly where needed without requiring the entire work contact element to be made from expensive wear-resistant material, thus balancing reliability improvement with manufacturing complexity control.
2Reliability
If additional inserts are added to protect the front side surface of the WCE, then wear resistance is improved, but structural integrity may be compromised
Solution Approach 1:
The patent applies local quality by placing wear-resistant inserts specifically at the contact surface and front side surface of the work contact element where wear occurs during roofing applications. This localized approach provides wear resistance exactly where needed without requiring the entire work contact element to be made from expensive wear-resistant material, thus balancing reliability improvement with manufacturing complexity control.
3Productivity
If the work contact element is used with abrasive asphalt shingles, then productivity is improved, but wear on the contact surface increases
Solution Approach 1:
The patent applies composite materials by combining the work contact element structure with wear-resistant inserts made from carbide or other wear-resistant materials. This composite construction allows the tool to maintain its structural integrity while the wear-resistant inserts handle the abrasive contact with asphalt shingles, enabling sustained productivity in roofing applications without excessive wear.
Data Source
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AI summary
A fastener driving tool (10) includes a housing (12), a nose assembly (22) having a fastener passage (24) configured to allow fasteners (28) to be advanced therethrough, and a safety contact assembly (36) movable in relation to the nose assembly between a disable position and an enable position. A magazine assembly (26) is configured to supply fasteners toward the nose assembly, and a driver (32) is configured to cause a fastener located in the fastener passage to be advanced within the nose assembly. The nose assembly (22) includes (i) a base member defining at least a portion of the fastener passage (24) and has a first recess and a second recess which are spaced apart from each other, (ii) a first protection insert located in the first recess, and (iii) a second protection insert located in the second recess. The base member defines a leading side surface and a trailing side surface. The leading side surface defines an ejection orifice that is aligned with the fastener passage. The leading side surface defines a first opening aligned with the first recess and a second opening aligned with the second recess, and the trailing side surface defines a third opening aligned with the first recess and a fourth opening aligned with the second recess. The first protection insert extends through the first opening and the third opening, and the second protection insert extends through the second opening and the fourth opening.