Firearms – Breech loading – Magazine guns
Reexamination Certificate
2000-01-07
2001-08-14
Jordan, Charles T. (Department: 3644)
Firearms
Breech loading
Magazine guns
C227S009000
Reexamination Certificate
active
06272782
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a cartridge magazine displacement mechanism for an explosive powder charge-operated setting tool and including a spring-biased transfer member pivotable about a first pivot, cooperating with the trigger and displaceable substantially parallel to actuation direction of the trigger, a spring-biased, one-arm displacement lever cooperating with a free end of the transfer member, pivotable about a second pivot fixedly secured in the setting tool housing, and having an engaging dog provided at a free end of the displacement lever, displaceable substantially parallel to a longitudinal extent of the cartridge channel, and engageable in and liftable of the cartridge channel.
2. Description of the Prior Art
For driving, e.g., nail-shaped fastening elements in a hard constructional component formed of stone, concrete, steel and the like, explosive power charge-operated setting tools are used. Such a setting tool is disclosed, e.g., in German Publication DE 20 44 920. The setting tool disclosed in the German Publication has a trigger which cooperates with a spring-biased transfer member formed as a one-arm lever pivotable about a first pivot fixedly secured in the setting tool housing. The free end of the transfer member is provided with a cam which cooperates with a control track provided on a spring-biased displacement lever pivotable about a second pivot likewise fixedly secured in the setting tool housing. The free end of the displacement lever is provided with an engaging dog engagable in and liftable off the cartridge channel of the setting tool.
Upon actuation of the trigger, the cam provided on the transfer member slides over the control track provided on the displacement lever and preloads the same. Because of a large friction between the cam and the control track, a significant force is required for the actuation of the trigger. This leads to signs of fatigue in the operator soon after he starts working.
Accordingly, an object of the present invention is to provide cartridge magazine displacement mechanism which can be operated in a simple and reliable manner and does not require that a significant force be applied to the trigger for actuating the setting tool.
Another object of the present invention is to provide a cartridge magazine displacement mechanism that becomes preloaded upon actuation of the trigger after the setting tool was pressed against a constructional component, and that advances the cartridge magazine when the setting tool is lifted off the constructional component.
SUMMARY OF THE INVENTION
These and other objects of the present invention, which will become apparent hereinafter, are achieved by locating the first pivot on the displacement lever between the second pivot and the engaging dog.
The substantially friction-free connection between the transfer member and the displacement lever insures that a small force is necessary for the actuation of the trigger which, in turn, insures a fatigue-free operation of the setting tool by the operator.
The arrangement of the first pivot on the displacement lever depends on the size of the displacement path of the trigger and on the displacement path of the engaging dog. Preferably, the distance between the first and second pivots corresponds to 0.15-0.5 times of the distance between the engaging dog and the second pivot.
In order to be able to prevent the advancement of the cartridge magazine in setting tools with an automatic feed of the fastening elements until another fastening element is fed into a guide tube of the setting tool, advantageously, the transfer member cooperates with a locking lever pivotable about a third pivot provided in the housing.
Cooperation means here, e.g., an axial positioning of the transfer member and, thereby, of the displacement lever in the preloaded condition. To provide for the proper positioning, the transfer member, advantageously, has a stop rim that cooperates with a locking lever.
In order to provide for pivotal movement of the locking lever dependent on the pressing path of the setting tool, preferably, the locking lever is pivoted by a pressure pin displaceable parallel to the setting direction of the setting tool.
E.g., in order to provide for a pivotal movement of the locking lever, which is arranged sidewise of the pressure pin, upon a longitudinal displacement of the pressure pin, preferably, the pressure pin is provided with a control member for displacing the locking lever.
Simple and reliable actuation of the locking lever is achieved when the control member is provided, e.g., with a projection which cooperates with a control track formed on the locking lever.
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 operation, together with additional advantages and objects thereof, will be best understood from the following detailed description of preferred embodiment, when read with reference to the accompanying drawings.
REFERENCES:
patent: 3050892 (1962-08-01), Vogler et al.
patent: 4077556 (1978-03-01), Buchel
patent: 4375269 (1983-03-01), Bosch et al.
patent: 4821938 (1989-04-01), Haytayan
patent: 2044920 (1972-03-01), None
patent: 0042063 (1981-05-01), None
Bönig Stefan
Dittrich Tilo
Hilti Aktiengesellschaft
Jordan Charles T.
Sidley Austin Brown & Wood LLP
Zerr John W.
LandOfFree
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