Cutting – By tool reciprocable along elongated edge – With means to support tool at opposite ends
Reexamination Certificate
2000-02-17
2001-12-11
Rachuba, M. (Department: 3724)
Cutting
By tool reciprocable along elongated edge
With means to support tool at opposite ends
C083S699210, C083S783000
Reexamination Certificate
active
06327952
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is directed to a scroll saw, and in particular, a scroll saw having a mechanism for varying the tension on the scroll saw blade.
2. Description of the Prior Art
Scroll saws are known in the art and include upper and lower arms extending forwardly from a housing. Blade clamps are disposed at the forward ends of the arms and each clamp secures one end of a generally vertically disposed blade. The blade extends through a hole in a workpiece support table. The blade is reciprocated in a generally vertical plane to achieve a precise cutting action, for example, by simultaneously reciprocating the arms in a vertical plane. The precise cutting action allows for detailed woodworking. However, in order to achieve the desired precision, of cut the blade must be properly tensioned. Accordingly, scroll saws may be provided with an adjustable tensioning mechanism for the blade.
SUMMARY OF THE INVENTION
The present invention is directed to a saw including housing having an inner surface and a pivoting arm having rearward and forward ends. The rearward end of the pivoting arm is disposed within an opening in the housing and the pivoting arm extends forwardly from the housing. The pivoting arm is vertically pivotable relative to the housing about an axis intermediate of the rearward and forward ends. A first blade clamp is disposed substantially at the forward end of the pivoting arm. The blade clamp secures one end of a saw blade. A wedge is disposed within the housing, in contact with the inner surface of the housing. The wedge also is disposed in contact with and translatable along a surface of the pivoting arm. A rod is linked to the wedge and extends through the pivoting arm. Longitudinal translational movement of the rod causes translation of the wedge along the pivoting arm and the inner surface such that when the wedge move forwardly the contact between the wedge and the inner surface causes the wedge and the rearward end of the pivoting arm to pivot, downwardly and the forward end of the pivoting arm to pivot upwardly thereby causing upward movement of the blade the blade clamp to increase the tension of the blade.
In a further embodiment, the saw includes a housing, an upper pivoting arm and a first blade clamp disposed substantially at the forward end of the upper pivoting arm. The saw also includes a second blade clamp disposed below the first blade clamp and securing a second end of a blade. A workpiece support table is disposed between the first and second blade clamps and has a hole through which a blade may extend. When the lower end of the blade is released from the lower blade clamp, the upper pivoting arm may be pivoted such that the blade is pivoted vertically until the lower end of the blade passes through and clears the table opening.
In a further embodiments, when the upper end of the blade is released from the upper blade clamp, the upper pivoting arm may be pivoted such that there is a space between the upper blade clamp and the upper end of the blade.
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O'Banion Michael L.
Shadeck Louis M.
Sommerville Thomas R.
Welsh Robert P.
Ayala Adan
Black & Decker Inc.
Rachuba M.
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