Compact Gas-Spring Fastener Driver Without External Air Supply
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Solution Overview
Problem
Existing fastener drivers face power, size, and cost constraints, particularly in designs utilizing compressed air or electrical energy.
Innovation Solution
A gas spring-powered fastener driver with a compact piston and driver blade system, utilizing an inner cylinder and storage chamber cylinder with pressurized gas, achieving a stroke length greater than 3 inches and a piston diameter of less than 1.7 inches, and operating at pressures above 180 psi.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a compact piston design is used to reduce device size, then the device meets size constraints, but generating sufficient driving force becomes more difficult
Solution Approach 1:
The patent changes the pressure parameter from conventional levels to greater than 180 psi, which compensates for the reduced piston surface area. This parameter change allows the compact piston (diameter less than 1.7 inches) to generate sufficient driving force despite its small size, resolving the contradiction between compactness and force generation capability
2Force
If external air compressors are used to provide sufficient pressure, then driving force is adequate, but device complexity and cost increase
Solution Approach 1:
The patent extracts and eliminates the external air compressor from the system, replacing it with an integrated high-pressure gas storage chamber. This removal of the external compressor simplifies the overall device complexity while maintaining adequate driving force through the integrated storage chamber design
Solution Approach 2:
The patent merges the gas storage function directly into the device structure by integrating the high-pressure gas storage chamber with the piston assembly. This consolidation eliminates separate external components and reduces overall system complexity while providing sufficient driving pressure
3Ease of operation
If high pressure gas storage is implemented without external compressors, then device portability improves, but maintaining sufficient pressure becomes more challenging
Solution Approach 1:
The patent establishes a minimum pressure threshold of greater than 180 psi in the integrated storage chamber, which is sufficiently high to provide adequate driving force while being maintainable through simple refill operations. This parameter setting balances portability requirements with pressure maintenance feasibility
Data Source
AI summary
A powered fastener driver including a housing, an inner cylinder within the housing, and a piston movable within the inner cylinder from a TDC position to a BDC position. The piston has a diameter of less than 1.7 inches. A stroke length of the piston is between the TDC position and the BDC position measuring greater than 3 inches. A driver blade is attached to the piston for movement therewith along a driving axis. A lifter is operable to move the piston and driver blade from the BDC position toward the TDC position. A drive unit is operably coupled to the lifter to provide torque thereto, causing the lifter to rotate. A source of pressurized gas is in fluid communication with the inner cylinder. A pressure of the pressurized gas acting on the piston at the TDC position is greater than 180 psi.