Power actuated fastening tool

Details Power actuated fastening tool Power actuated fastening tool

1997-11-03

1999-12-07

Vo, Peter

Elongated-member-driving apparatus

Explosive-type driving means

With plunger

227 9, B25C 104

Patent

active

059968753

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention relates to a power actuated fastening tool for driving a fastener, such as a nail, into a substrate, such as a concrete or steel structure.
Power actuated tools for driving a fastener into a substrate conventionally comprise a barrel from which the fastener is expelled by means of a piston driven by detonation of an explosive charge. The barrel is mounted for axial movement within a receiver assembly or body of the tool and after firing can be moved forwardly of the receiver assembly in order to reset the piston into the rear end of the barrel, the barrel with the piston then being retracted back into the body assembly in preparation for the next detonation. For this purpose the barrel normally has an axial slot into which can extend a pawl which engages and restrains the piston when the barrel is moved forwardly so that the piston is reset in the rear end of the barrel during this movement.
In one previously proposed tool of this type as disclosed in International patent application PCT/AU90/00019 the barrel comprises separate front and rear sections, the rear section being telescopically mounted within the front section to permit limited axial movement between the two sections. The construction of the barrel in two separate sections facilitates manufacture of the barrel and the provision for limited axial movement between the front and rear sections enables recoil on firing of the tool to be absorbed by relative axial movement between the two sections to an extended configuration. In this previously proposed tool the two sections of the barrel are held in assembled relationship by retaining segments held by means of a spring clip. In a tool of this type, it is necessary to periodically disassemble the barrel for cleaning purposes, which requires removal of the clip and segments. The disassembly and subsequent reassembly requires a degree of dexterity which is not always possible within the environment of a construction site, and sometimes the segments are dropped and become lost.


SUMMARY OF THE INVENTION

According to the present invention, there is provided a power actuated tool comprising a barrel having a piston for driving a fastener into a substrate upon firing of an explosive charge, the barrel being mounted for axial movement within a body of the tool whereby to permit resetting of the piston to the rear of the barrel after firing by withdrawing the barrel forwardly of the body, wherein the barrel comprises front and rear sections mounted for telescopic movement one relative to the other to an extent sufficient to absorb recoil on firing of the tool, and at least one retainer element interposed between the front and rear barrel sections to cause entrainment of the rear barrel section with the front barrel section when the latter is drawn forwardly of the body in order to reset the piston, the configuration being such that assembly and disassembly of the barrel sections can be accomplished by relative movement between the barrel sections without the need to remove the retainer element.
In a preferred embodiment of the invention the retainer element is carried by the front barrel section and engages a rearwardly facing abutment surface of the rear barrel section to cause entrainment of the rear barrel section when the front barrel section is drawn forwardly, the abutment surface of the rear barrel section being at the forward end of an axial track which receives the retainer element whereby movement of the barrel sections between contracted and extended positions is guided by cooperation between the retainer element and track. The retainer element is engageable into the axial guidance track on assembly of the barrel sections by movement through at least one transverse transfer track opening into the axial guidance track.
Preferably, the guidance and transfer tracks are each defined by a slot or groove formed in the rear barrel section.
Preferably, the transfer track communicates at its end remote from the guidance track with a further axial track

REFERENCES:
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patent: 4358041 (1982-11-01), Ollivier
patent: 4655380 (1987-04-01), Haytayan
patent: 4705200 (1987-11-01), Kopf
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patent: 4804127 (1989-02-01), Kirkman
patent: 4809568 (1989-03-01), DeCaro
patent: 4867365 (1989-09-01), Beuchel et al.
patent: 5657919 (1997-08-01), Berry
patent: 5797534 (1998-08-01), Almeras et al.

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