Cutlery – Scratching implements – Having traction-rotated tool
Patent
1992-09-16
1994-11-08
Seidel, Richard K.
Cutlery
Scratching implements
Having traction-rotated tool
B25B 702
Patent
active
053614984
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to cutting nippers, particularly for cutting glass panes, tiles, and the like, with two long operating handles, two shorter pressure levers and detachable nipping tools located on the working ends of the pressure levers, said tools being provided with cutting edges which are directed towards each other and can be moved towards and away from each other.
In a known design of tile cutting nippers of the aforementioned type (DE-A 32 12 624), the pressure levers have integrally moulded angles which run vertical to the levers and are directed towards each other, said angles being formed into the cutting edges in one piece, i.e. in undetachable form. In this known design, the cutting tools consists of the same material as the levers and have, to be adapted to their intended use by means of complex heat-treatment processes and grinding work. In this context, the entire lever mechanism has to run through the full manufacturing process of the cutting tools.
SUMMARY OF THE INVENTION
In a known design of nipper pliers for twisting and cutting-off wire ends (DE-B 28 32 425), the cutting tools are designed as separate tips which can be secured to the pressure levers of the pliers with the aid of screws.
Working on the known prior art, the invention is based on the task of creating cutting nippers whose nipping tools can be kept sharp at all times with relatively little effort.
According to the invention, this task is solved by designing the nipping tools to consist of cutting wheels and by the fact that the cutting wheels can be secured in various or any desired rotational positions relative to the working ends of the pressure levers.
In the design according to the invention, the cutting wheels forming the nipping tools can be manufactured and machined independently of the lever mechanism. The nipping tools are not fitted to the pressure levers until the cutting wheels are completely finished. This can considerably facilitate the manufacturing process.
Furthermore, the design in accordance with the invention has the advantage not only that worn cutting wheels can be replaced by new, sharp cutting wheels, but also that the full circumference of the cutting wheels can be utilised. Therefore, before a cutting wheel is regarded as blunt and in need of replacement, it can first be set to between 12 and 24 different positions, depending on application, with a sharp cutting area being available each time.
The use of cutting wheels as nipping tools also achieves a surprising new technical effect. To perform a nipping operation, the user now has to apply substantially less force, the result being that the new device is particularly gentle on the arms. The easier and more pleasant work width the curved cutting edges also permits far more accurate and targeted work. Furthermore, the new tool can even be used easily and comfortably by inexperienced persons. For the Tiffany technique, in particular, the invention creates a new tool which exceeds all expectations.
The cutting wheels can preferably be securable not only in predetermined rotational positions, but in any desired rotational positions relative to the working ends of the pressure levers, so that, when the working area has become blunt, the cutting wheels can be rotated through any desired angle and then secured again. This makes it possible to use the full circumference of the cutting wheels, depending on application, and thus multiply the service life of the cutting nippers.
To aid setting, angle settings can be provided on the cutting wheels, thus making it easier for the user to advance the cutting wheels through a specified angle.
For securing the cutting wheels, these can have a central drilled hole and be screwed tight to the working ends of the pressure levers with the aid of one screw each. A fastening method of this kind presents absolutely no problems and also facilitates adjustment of the cutting wheels when the working area in use has worn.
It is expedient for each cutting wheel to have bevels sloping away f
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Heyrana Paul M.
Josef Bohle Stiftung + Co. KG
Seidel Richard K.
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