Tools for driving nails and the like
AssigneePoly Patent Aktiengesellschaft
InventorGiovanni Galluzzi
Life of this patent
Estimating the term…
Abstract
The invention relates to a nail driving tool, acting by means of an explosive charge, which, besides the normal component parts, comprises an explosion chamber of particular shape and volume, whereby a blow applied to the rear end of the tool causes the explosive charge, compressed by the rear end of the nail driving piston in the explosion chamber, to reduce the volume of the latter according to a predetermined ratio, which reduction, in turn, originates the ignition of the explosive charge.
Claims8
A device for firing an explosive charge of the tablet type free of a cartridge case and rim fire means, said device comprising a breech, a firing member, and mounting means mounting said breech and firing member for relative movement;
- said breech including an apertured seat for receiving an explosive charge in tablet form, and a closed compression cavity rearwardly of said seat, and said firing member including protuberance means passable axially through said seat and into said compression cavity for forcing a portion of an explosive charge seated on said seat into said compression cavity and for compressing air entrapped in said compression cavity to a degree to thermally ignite the explosive charge, said seat aperture defining a mouth of said compression cavity and said protuberance means being in the form of a projection of a lesser cross section than that of said seat aperture, said compression cavity is of a reducing cross section, said compression cavity including a small cross sectional portion remote from said apertured seat, and has a reducing tapered portion between said small cross sectional portion and said apertured seat.
A device for firing an explosive charge of the tablet type free of a cartridge case and rim fire means, said device comprising a breech, a firing member, and mounting means mounting said breech and firing member for relative movement;
- said breech including an apertured seat for receiving an explosive charge in tablet form, and a closed compression cavity rearwardly of said seat, and said firing member including protuberance means passable axially through said seat and into said compression cavity for forcing a portion of an explosive charge seated on said seat into said compression cavity and for compressing air entrapped in said compression cavity to a degree to thermally ignite the explosive charge, said compression cavity including a mouth and an inner portion remote from said mouth of a reduced cross section as compared to the cross section of said mouth, and said inner portion having a closed inner end defining a space into which entrapped air is compressed, said mouth being materially larger in cross section than that of said protuberance means.
Dependencies are inferred from the claim text.