Ordnance – Cartridge feeding – Belts
Reexamination Certificate
1999-12-22
2001-08-21
Eldred, J. Woodrow (Department: 3644)
Ordnance
Cartridge feeding
Belts
C089S033010, C089S034000, C042S049010, C206S003000, C224S931000
Reexamination Certificate
active
06276253
ABSTRACT:
BACKGROUND OF THE INVENTOR
1. Field of the Invention
The present invention relates to a cartridge clip including a carrier member and a plurality of propellant-containing cartridges arranged in the carrier member, with the carrier member having, at its first free end, a taper a width of which decreases in a direction transverse to the longitudinal extent of the carrier member and transverse to the axes of the cartridges.
2. Description of the Prior Art
For driving nail-shaped fastening elements in hard constructional components, setting tools, which are driven by cartridges containing a powdery propellant, are used. The cartridges are supplied from a cartridge clip as disclosed in German Publication DE 41 36 932 A1. For low-density constructional components with a small wall thickness, it is particularly important, to supply a small amount of energy to the setting tool for each setting process. This is effected by using the so-called “weak” cartridges, e.g., cartridges containing small amounts of propellant. Because with a small amount a complete combustion of the propellant take place, the “weak” cartridges are used in setting tools the combustion chamber of which has a particular geometry which enables to obtain, upon ignition of a cartridge, a combustion pressure necessary for the combustion of the propellant.
In setting tools without combustion chambers having this particular geometry, a complete combustion of the propellant takes place only then when “intermediate” or “strong” cartridges, i.e., cartridges containing more propellant, are used. Such cartridges permit to obtain a sufficient combustion pressure in chambers not having this particular geometry. The use of “weak” cartridges in setting tools without the specific combustion geometry of the combustion chamber leads to accumulation of non-burned propellant and to rapid dirt accumulation in the setting tool.
Accordingly, an object of the present invention is to provide a cartridge clip which can be mounted only in setting tools having a specific geometry enabling driving of the setting tool with “weak” cartridges.
Another object of the present invention, it to provide a cartridge clip which can be used only in setting tools in which a complete combustion of the propellant is insured.
SUMMARY OF THE INVENTION
These and other objects of the present invention, which will become apparent hereinafter, are achieved by providing a cartridge clip of the type described above in which the carrier member has, at its first free end, a taper a width of which decreases in a direction transverse to a longitudinal extent of the carrier member and transverse to longitudinal axes of the cartridges, and at least one locking surface provided in a region between the taper and a cartridge located adjacent to the taper and facing the taper.
The locking surface, which is provided on the carrier member prevents the cartridge clip with “weak” cartridges from being inserted in a setting tool which does not have a combustion chamber geometry adapted to the propellant power of such cartridges.
In order to prevent the cartridge clip from being inserted in a cartridge channel provided in the setting tool for receiving the clip, the locking surface extends substantially transverse to the longitudinal extent of the clip over a portion of its width.
In order to provide for support of a cartridge clip outside of the cartridge channel, the locking surface is formed, preferably, by an end surface of a strip provided on one side of the carrier member.
Therefore, the cartridge clip can be inserted only in a cartridge channel which has an additional groove corresponding to the cross-section of the strip and extending over the entire length of the channel.
A high rigidity of the cartridge clip is advantageously achieved by providing a strip which extends at least along a portion of the entire length of the carrier member.
To prevent the cartridge clip, upon the clip's being inserted in the cartridge channel, from tilting when it abuts, e.g., a stop which projects into the channel, the carrier member advantageously has two locking surfaces which, e.g., starting from both longitudinal edges of the carrier member, extend substantially transversed to the longitudinal extent of the cartridge clip over a portion of the width of the carrier member.
The carrier member of the cartridge clip can be provided with at least one locking surface which extends along a portion of the width of the carrier member, and/or a locking surface formed by an end surface of a strip provided on the carrier member.
The novel features of the present invention, which are considered as characteristic for the invention, are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its mode of opration, together with additional advantages and objects thereof, will be best understood from the following detailed description of preferred embodiments when read with reference to the accompanying drawings.
REFERENCES:
patent: 2856720 (1958-10-01), Kunz
patent: 3318245 (1967-05-01), Ferri et al.
patent: 4056062 (1977-11-01), Walser et al.
patent: 4098169 (1978-07-01), Gawlick et al.
patent: 5036746 (1991-08-01), Ehmig et al.
patent: 5811717 (1998-09-01), Day et al.
patent: 4136932 (1993-05-01), None
Hasler Roland
Sprenger Markus
Eldred J. Woodrow
Hilti Aktiengesellschaft
Sidley Austin Brown & Wood LLP
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