Cutlery – Powered planer
Patent
1990-06-05
1991-06-11
Watts, Douglas D.
Cutlery
Powered planer
144225, B27C 110, B27C 510
Patent
active
050221604
DESCRIPTION:
BRIEF SUMMARY
HAND-OPERATED POWER TOOL
The present invention relates to a power tool for shaping, shaving, chamfering, trimming and otherwise working workpieces of wood and other similar materials. More specifically, the power tool is suitable for planing concave and convex curves of varying raii, as well as flats in a workpiece.
Spokeshave planes are known for shaping wooden wowrkpieces and generally comprise a cutting blade mounted on a flat or rounded sole plate. Two handles, each extending from a respective side of the sole plate allow the plane to be held against the workpiece. The design of the spokeshave plane is such that it can be used to shape the surface or a workpiece with much greater effectiveness than other types of plane. However, as with all planes considerable physical effort must be exerted on the part of the user to work it over the surface of the workpiece. Moreover, it will only plane in one direction namely the direction in which the cutter blade is pointing which means that the user must turn it round each time he wants to plane in the opposite direction to the one he is working in. Finally, because the spokeshave plane must be pushed or pulled over the surface of the workpiece to operate effectively it is extremely difficult to use it in a relatively confined area to work concave curves of relatively small internal radii in the surface of the workpiece.
It is an object of the present invention to provide a power tool for shaping, shaving, chamfering, trimming and otherwise working workpieces which obviates or, at least, substantially mitigates the disadvantages of spokeshave planes referred to hereinabove.
According to the present invention there is provided a power tool comprising a cylindrical cutter block, drive means to rotatably drive the cutter block about its central axis, at least one cutting blade mounted in the cutter block parallel with the central axis thereof, and front and rear sole plates on which the power tool is supported, in use, against a workpiece, the front and rear sole plates being spaced from each other to define an elongate slot therebetween, parallel with the central axis of the cutter block, through which the cutting blades each extend as the cutter block rotates, wherein the front and rear sole plates are curved about the central axis of the cutter block.
The cutter block is rotatably driven at very high speed and as it does so waste is shaved from the area of the workpiece immediately facing the elongate slot by the cutter blades. The relatively short overall length of the front and rear sole plates, together with the fact that they are curved about the central axis of the cutter block made the power tool ideally suited for forming relatively intricate shapes in the surface of a workpiece. This ability is certainly enhanced by the fact that the power tool is about to shave waste from the workpiece as it is moved both towards and away from the user.
Indeed, where the power tool is required to operate in a relatively confined area it will shave waste from the workpiece if it is simply rotated back and forth about its central axis to move the elongate slot over the surface thereof. This technique can also be used to work concave curves of relatively small internal radii in the surface of a workpiece. As no, or almost no, pushing or pulling of the power tool is necessary to make it shave waste from the workpiece, it can be used to work concave curves of substantially the same internal radii as the radii of the curved sole plates. In fact, as the power tool is rotated back and forth it works its way into the workpiece until a point is reached where the maximum width of the recess formed is only slightly greater than the width of the power tool, whence the power tool can continue to increase the depth of the recess without substantially increasing the width of the recess. This is certainly not possible with a conventional spokeshave plane where pushing and pulling of the plane to shave waste from a workpiece inevitably results in concave curves worked in a workpiece bein
REFERENCES:
patent: 1357985 (1920-11-01), Impalea
patent: 1614783 (1927-01-01), Fekete
patent: 1636863 (1927-07-01), Jehle
patent: 2649874 (1953-08-01), Konopa
patent: 2771104 (1956-11-01), Saxe
patent: 2997081 (1961-08-01), Christophersen
Brewin Garry
Sharpe Richard
Sharpe Steven E.
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