Cutting – Rotatable disc tool pair or tool and carrier – Carrier for rotatable tool movable during cutting
Reexamination Certificate
1999-01-12
2001-01-09
Rada, Rinaldi I. (Department: 3724)
Cutting
Rotatable disc tool pair or tool and carrier
Carrier for rotatable tool movable during cutting
C083S581000, C083S471300, C083SDIG001
Reexamination Certificate
active
06170373
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to circular saws, for example, circular saws having a saw unit that has a circular saw blade and is vertically and horizontally movable relative to a workpiece to be cut. In particular, various means for preventing forward or rearward movement of the saw blade during a cutting operation are taught.
DESCRIPTION OF THE RELATED ART
In order to cut a workpiece using a circular saw in a “chop cutting mode,” the saw unit is slidably moved rearwardly away from the operator by pushing the saw unit in a horizontal direction relative to a table, so that the saw unit is positioned forward adjacent the workpiece. The saw unit is then pressed downwardly toward the table to cut the workpiece. However, because the circular saw blade of the saw unit is positioned forwardly of the workpiece and rotates downwardly rearward relative to the workpiece during the cutting operation, a reaction force is applied to the saw unit in a direction forward toward the operator, as a result of rotating saw blade contacting the workpiece. For this reason, the operator is required to apply an additional force in the rearward direction to counteract this reaction force. Consequently, the operator may become fatigued during such chop cutting operations.
SUMMARY OF THE INVENTION
Therefore, an object of the present invention to provide improved circular saws.
In particular, circular saws are taught that have means for preventing the saw unit from moving in one of either the forward or rearward directions during the cutting operation. Preferably, the circular saw is not permitted to move in the forward direction in which a reaction force, generated by the rotating circular saw blade contacting the workpiece, is applied
Thus, the saw unit is not moved by the reaction force applied from the workpiece and the operator is not required to apply a counteract force to the saw unit to hold the saw unit in position against this reaction force. Therefore, the operability of the circular saw can be improved and the burden on the operator can be reduced.
Other objects, features and advantages of the present invention will be readily understood after reading the following detailed description together with the accompanying drawings and the claims.
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Sasaki Katsuhiko
Shibata Yoshinori
Dennison, Scheiner Schultz & Wakeman
Flores-S{acute over (a)}nchez Omar
Makita Corporation
Rada Rinaldi I.
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