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1. (WO2018128818) POWERED FASTENER-DRIVING TOOL INCLUDING AN ENGAGING ELEMENT TO FRICTIONALLY ENGAGE A PISTON UPON RETURNING TO A PRE-FIRING POSITION

Pub. No.:    WO/2018/128818    International Application No.:    PCT/US2017/067594
Publication Date: Fri Jul 13 01:59:59 CEST 2018 International Filing Date: Thu Dec 21 00:59:59 CET 2017
IPC: B25C 1/08
Applicants: ILLINOIS TOOL WORKS INC.
Inventors: ZHAO, Hanxin
MOORE, Stephen
Title: POWERED FASTENER-DRIVING TOOL INCLUDING AN ENGAGING ELEMENT TO FRICTIONALLY ENGAGE A PISTON UPON RETURNING TO A PRE-FIRING POSITION
Abstract:
Various embodiments of the present disclosure provide a combustion-powered fastener-driving tool including an engaging element that improves tool performance by frictionally engaging a piston upon its return to a pre-firing position, thereby reducing the likelihood that the piston will end up at a position other than the pre-firing position after completion of a fastener-driving cycle. In one embodiment, the fastener-driving tool comprises a cylinder, a driving assembly slidably disposed within the cylinder and movable from a pre-firing position to a firing position to drive a fastener into a workpiece, and an engaging element. The driving assembly includes an outwardly tapered engaging element contact surface, and the engaging element is positioned to engage the engaging element contact surface when the driving assembly is in the pre-firing position.