PORTED PISTON FOR AUTOMATIC NAILER

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United States of America Patent

APP PUB NO 20170209996A1
SERIAL NO

15481978

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Abstract

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A piston assembly for a nailer is provided, and includes a piston body with an upper surface, a lower surface and a peripheral edge. A peripheral gland is located between the upper and lower surfaces, the gland having an inner closed end and defining an annular space. An annular piston seal is disposed in the gland, and a plurality of spaced air ports are disposed adjacent the peripheral edge, the ports each being in fluid communication with the gland. The gland and the seal are dimensioned so that during a power cycle of the nailer, pressurized air generated during a fastener driving stroke enters the ports and radially expands the seal for enhancing friction between the seal and a surrounding cylinder. During a return stroke, the seal is radially retracted within the gland to reduce friction between the seal and the cylinder.

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Patent Owner(s)

Patent OwnerAddress
ILLINOIS TOOL WORKS INC155 HARLEM AVENUE GLENVIEW IL 60025

International Classification(s)

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  • 2017 Application Filing Year
  • B25C Class
  • 154 Applications Filed
  • 108 Patents Issued To-Date
  • 70.13 % Issued To-Date
Click to zoom InYear of Issuance% of Matters IssuedCumulative IssuancesYearly Issuances201720182019202020212022202320240255075100

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Mina, Nathan Thomas Lake in the HIlls, US 5 35

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  • B25C Class
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Citation count rangeNumber of patents cited in rangeNumber of patents cited in various citation count ranges2994175201 - 1011 - 2021 - 3031 - 4005101520253035404550556065707580859095100

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