Cutlery – Cutting tools – Saw
Patent
1994-07-08
1997-10-14
Payer, Hwei-Siu
Cutlery
Cutting tools
Saw
B27G 1910
Patent
active
056758987
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an anti-splintering device for sawing machines having a saw blade which can be operationally connected to the sawing machine, can be laid on workpieces and can be arranged laterally in relation to the saw blade and in the region of the saw blade teeth emerging from the workpiece.
An anti-splintering device of the type referred to initially is known and is described, for example, in DE 37 18 232 C2 as a guard plate of a circular saw. The circular saw consists of a sawing table and a motor-driven saw blade, the sawing table having a recess for the passage of the saw blade to reach a workpiece which is to be sawn, and the splinter guard plate, which can be releasably attached to the sawing table, being assigned to the recess, resting on the workpiece during use and masking the recess on both sides of the saw blade. The splinter guard plate consists in this case of hard rubber, plastic or a similar sawable, non-splintering material, being of continuous design in the new state and acquiring a saw slit as a result of the first pivoting movement of the saw blade. It is perceived to be a disadvantage of the known splinter guard plate that it can only fulfil this function lastingly under certain preconditions, specifically if the saw blade does not wobble or wobbles very little, which is only theoretically possible, and if the same or an identical saw blade is always used. If the original saw blade is replaced by another whose dimensions differ from the dimensions of the original saw blade, then the slit which was originally regarded as optimum changes, which is undesirable. It is to be regarded as a further disadvantage of the known splinter guard plate that it is hardly suited to minimising the amplitudes of the vibrations of the saw blade, since no force is exerted on the saw blade. Finally, in DE-GM 83 14 647, a baseplate for hand-operated circular saws is described which has a recess for the floating protective cap and the saw blade. An anti-splintering device is inserted in the front region of the recess, relative to the saw blade, and is provided with a slit, exactly adapted to the tooth width of the saw blade, for the passage of the saw blade into this region. The anti-splintering device can be connected in a stationary manner to the baseplate, being able to fulfil its function only, at best, when the width of its slit corresponds to the width of the teeth. Since the saw blade performs vibrations, the width of the slit becomes greater over time, so that a gap forms between the saw blade and the anti-splintering device, the result of which is that a clean cut with a sharp edge can no longer be achieved.
SUMMARY OF THE INVENTION
On the basis of the above state of the art, the object of the invention is to provide an anti-splintering device which not only makes it possible to obtain a clean cut edge but is also suited to dampening vibrations of the saw blade.
The object set is achieved according to the invention, in the anti-splintering device of the generic type, in that the anti-splintering device is in pressure contact with the saw blade in the region of the emerging saw blade teeth.
It will be recognised that the invention is embodied whenever the anti-splintering device is a member which, in the operating state of the hand-operated circular saw, is actively connected simultaneously both to the workpiece and to the emerging teeth of the saw blade, so that the anti-splintering device exerts a force not only on the workpiece but also on the saw blade. This exertion of force prevents the formation of a gap between the teeth of the saw blade and the anti-splintering device. Since the anti-splintering device rests in close contact on the workpiece in the region of the cut, no gap, which could be regarded as the cause of a ragged cut edge, is formed in this region either. The cutting line also becomes considerably more precise as a result of the suppression or even elimination of vibrations of the saw blade.
It is particularly advantageous if the anti-spli
REFERENCES:
patent: 2842170 (1958-07-01), Bruck et al.
patent: 2854043 (1958-09-01), Raymond
patent: 2996089 (1961-08-01), McCarty
patent: 3623518 (1971-11-01), Nicotra
Kalber Gerhard
Kalber Ralf
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