Fiberglass Nylon Composite Hammer Tacker Shell
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Solution Overview
Problem
Conventional hammer tackers are heavy, noisy, and difficult to manufacture due to metal shell constraints, resulting in shaking and additional processing needs.
Innovation Solution
A hammer tacker with a shell composed of injection-molded fiberglass and nylon half-shells enclosing a striking mechanism made of metal, including a magazine, striker, actuator, and transmission mechanism, reducing weight and noise while simplifying manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal plates or sheets are used to form shells, then the shells have high strength and durability, but the shells become heavy and difficult to process
Solution Approach 1:
The patent applies composite materials by combining fiberglass and nylon in a 3:2 ratio to create a shell that is both lightweight and strong. This composite material resolves the contradiction by providing the necessary structural strength without the excessive weight of solid metal shells.
Solution Approach 2:
The patent changes the material parameters by transitioning from solid metal to a fiberglass-nylon composite with specific weight and strength characteristics. This parameter change allows the shell to meet strength requirements while significantly reducing weight.
2Stability of the object's composition
If metal plates or sheets are used to form shells, then the shells provide structural integrity, but additional positioning pieces are required to position the striking mechanism
Solution Approach 1:
The patent merges the positioning function directly into the shell structure by forming positioning ribs as integral parts of the fiberglass-nylon shell during molding. This eliminates the need for separate positioning pieces and simplifies the overall device structure while maintaining structural integrity.
Solution Approach 2:
The shell structure provides its own positioning function through the integrated positioning ribs, making the system self-sufficient. The positioning ribs are automatically formed as part of the shell manufacturing process, eliminating the need for additional positioning components.
3Strength
If metal shells are used, then the shells are durable, but gaps between the shell and striking mechanism result in noises and shaking
Solution Approach 1:
The fiberglass-nylon composite shell has inherent damping properties that reduce vibrations and noise. The material's flexibility allows for better contact and reduced gaps between the shell and striking mechanism, thereby minimizing noise and shaking during operation.
Solution Approach 2:
The composite material structure of the shell provides vibration damping characteristics that metal shells lack. This reduces the transmission of vibrations and noise from the striking mechanism to the user, eliminating the harmful noise and shaking effects.
Data Source
AI summary
A hammer tacker includes a shell and a striking mechanism. The shell is composed of two half-shells which are made of a mixture of 30% to 70% of fiberglass and 70% to 30% of nylon by weight by injection molding. The two half-shells enclose an opening at an end of the shell. Each half-shell has a positioning rib portion facing to the other half-shell. The striking mechanism is arranged in the shell and includes a magazine, a striker, an actuator, and a transmission mechanism. The magazine is positioned by the positioning rib portions. The striker is located at the opening and is movable for striking nails out. The actuator is also movable at the opening. The transmission mechanism connects the striker and the actuator together to make them move oppositely.