Gas Spring for a Fastener Driving Tool
OwnerPeter Wierzchon, Ramon Taminventors
Life of this patent
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Abstract
A hand-held linear fastener driving tool such as a nailer includes a multi-piston gas spring driver mechanism that includes a piston assembly disposed in a gas cylinder. The piston assembly includes an accumulator piston, a striker piston disposed between the accumulator piston and an open end of the cylinder, and a blade that protrudes from the striker piston. The accumulator piston and the striker piston each form a fluid tight seal with the cylinder inner surface. The piston assembly includes a fluid column that extends between the accumulator piston and the striker piston. A gas storage chamber is disposed between the accumulator piston and the closed end. The piston assembly moves as a unit within the cylinder during tool operation.
Claims23
A fastener driver mechanism for a fastener driving tool, the fastener driver mechanism comprising
- a driver mechanism housing including
- a housing sidewall that has a closed shape when viewed in cross-section,
- a housing closed end disposed at a first end of the housing sidewall, and
- a housing open end disposed at a second end of the housing sidewall,
- an accumulator piston disposed in the driver mechanism housing between the housing open end and the housing closed end, the accumulator piston comprising a first seal that contacts, and forms a seal with, an inner surface of the housing sidewall, the accumulator piston being configured to move relative to the housing sidewall along a first axis,
- a striker piston disposed in the driver mechanism housing between the accumulator piston and the housing open end, the striker piston comprising a second seal that contacts, and forms a seal with, the inner surface of the housing sidewall, the striker piston being configured to move relative to the housing sidewall along a second axis,
- and
- a blade that protrudes from an open end-facing surface of the striker piston, the blade configured to engage with, and apply a driving force to, a fastener upon operation of the fastener driving tool,
- wherein
- a gas storage chamber is defined between the accumulator piston, the housing closed end and the housing sidewall,
- a fluid chamber is defined between the striker piston, the accumulator piston and the housing sidewall, the fluid chamber being filled with a fluid,
- the first seal is configured to prevent fluid communication between the gas storage chamber and the fluid chamber, and
- the second seal is configured to prevent fluid communication between the fluid chamber and the housing open end.
A hand-held fastener driving tool comprising:
- a tool housing including a handle,
- a fastener driver mechanism disposed in the tool housing, the fastener driver mechanism comprising
- a driver mechanism housing including
- a housing sidewall that forms a closed shape when viewed in cross-section,
- a housing closed end disposed at a first end of the housing sidewall, and
- a housing open end disposed at a second end of the housing sidewall,
- an accumulator piston disposed in the driver mechanism housing between the housing open end and the housing closed end, the accumulator piston comprising a first seal that contacts, and forms a seal with, the inner surface of the housing sidewall, the accumulator piston being configured to move relative to the housing sidewall along a first axis,
- a striker piston disposed in the driver mechanism housing between the accumulator piston and the housing open end, the striker piston comprising a second seal that contacts, and forms a seal with, the inner surface of the housing sidewall, the striker piston being configured to move relative to the housing sidewall along a second axis,
- and
- a blade that protrudes from an open end-facing surface of the striker piston, the blade configured to engage with, and apply a driving force to, a fastener upon operation of the fastener driving tool,
- wherein
- a gas storage chamber is defined between the accumulator piston, the housing closed end and the housing sidewall,
- a fluid chamber is defined between the striker piston, the accumulator piston and the housing sidewall, the fluid chamber being filled with a fluid,
- the first seal is configured to prevent fluid communication between the gas storage chamber and the fluid chamber, and
- the second seal is configured to prevent fluid communication between the fluid chamber and the housing open end.
Dependencies are inferred from the claim text.