Integrated spark and switch apparatus for combustion power fastener driving tool

Abstract

A combustion-powered tool having a workpiece contacting element movable relative to the tool as the tool is depressed prior to firing includes a spark unit having a high voltage spark supply for providing an ignition spark, a printed circuit board having a first portion configured for receiving and being electrically connected to the high voltage spark supply, and a second portion configured for receiving and being electrically connected to both an actuator switch and a trigger switch, the switches and the spark supply being electrically connected so that to enable firing, the workpiece contact element actuates the actuator switch, which then enables activation of the trigger switch. A unitary actuator has a fixed end, a movable end engageable by movement of the workpiece contact element and a middle portion for engaging the actuator switch upon movement of the movable end caused by depression of the tool against a workpiece.

Description

technical field [0001] The present invention relates generally to improvements in fastener driving tools, and more particularly to such tools that are combustion powered and have applications in rough assembly and / or trim installation utilizing fasteners, other decorative applications and uses In fastener finishing applications, the fasteners used are smaller, made from thinner wire stock, and / or used with smaller and / or more delicate workpieces. The latter will generally be referred to as "decorative applications". Several features incorporated into this tool are intended to make such tools more efficient in their manufacture, use and / or repair. Background technique [0002] Portable combustion power tools for driving fasteners into workpieces are described in commonly assigned patents to Nikolich, U.S. Patent Nos. Re32,452; 4,403,722; 4,483,473; 4,483,474; Here for reference. Combustion powered tools of this type specifically designed for decorative applications are dis...

AI Technical Summary

Problems solved by technology

In prior art tools, the mechanical linkage of the actuation system involved multiple components, thus complicating the manufacture and assembly of the tool

[0007] Another design feature of these tools is that the switches for the actuator and trigger are located far apart in the tool housing, complicating assembly and manufacturing

Additionally, the construction of these switches makes it difficult to keep the internal optics in alignment

Also, these switches are prone to foreign objects falling on the lens and causing damage to the operation

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