Cutlery – Combined cutlery or combined with ancillary feature – With means to apply transient fluid to tool
Reexamination Certificate
1998-12-08
2001-01-16
Peterson, Kenneth E. (Department: 3724)
Cutlery
Combined cutlery or combined with ancillary feature
With means to apply transient fluid to tool
C030S390000
Reexamination Certificate
active
06173499
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to the field of electric tools, and more particularly to a novel vent cover detachably connected to the body of an electric motor on a saw so as to divert exhaust air from the motor to the workpiece so that accumulated dust or sawdust is blown away.
2. Brief Description of the Prior Art
In the past, it has been the conventional practice to use an electric handsaw having a rotating blade for cutting material such as wood or the like. In the usual practice, a guideline is placed on the working surface of the workpiece and the edge of the sawblade is directed along the guideline by visual alignment of the user with the line. As the blade is rotated by an electric motor, the blade cuts along the guideline as intended and predicted. However, as the cutting proceeds, sawdust, debris, dust or the like may collect ahead of the sawblade and cover the guideline so that the operator's visibility is impaired. Such impairment sometimes causes the cut to diverge from the guideline and the workpiece is then rendered useless since the cut is in the wrong place.
Therefore, a long-standing need has existed to provide a novel means for removing sawdust, dirt or the like from the area on a workpiece immediately ahead of the cutting blade so that the operator's vision is not obscured. Particularly when employing an electric saw, the sawdust is collected ahead of the saw to cover the guideline and the exhaust air from the electric motor is discharged along the side of the saw body and in some instances, the exhaust air contributes to the collection of sawdust on the line intended to be followed by the saw cut. Means may be provided for detachably connecting to the side of the saw body which would take advantage of the exhaust air so that the accumulation of sawdust is blown away or removed rather than collected.
SUMMARY OF THE INVENTION
Accordingly, the above problems and difficulties are avoided by the present invention which provides a novel vent cover for an electric saw which will readily remove and distribute waste sawdust, dust or debris from a workpiece so as to maintain a guideline free from visual obstruction. In one form of the invention, the vent cover includes a shell having an opening at its back end and one side being opened so that the shell may be detachably connected to the side of the saw body immediately ahead of the motor armature discharge baffling. The front end of the shell is curved and the top of the shell is tapered forwardly so that the exhaust air from the armature enters the rear of the shell and is directed by the curvature of the tapered top and curved front end to be conducted laterally across the front of the saw blade to forcibly remove sawdust or the like that would normally collect on the workpiece covering the guideline as the saw is advanced. The shell includes an edge marginal region along the top front end and bottom which includes means for detachably coupling to the side of the saw body. Such means may include a releasable fastener or may take the form of an interference fit with other components normally carried on the body of the saw. A further feature resides in providing a curved front end not only from the top to the bottom but from the closed side of the shell towards the opposite side opening. Thus, the airstream or the exhaust air from the armature passes through the vent baffling and is redirected by the interior surface of the shell into a lateral discharge across the front of the sawblade.
Therefore, it is among the primary objects of the present invention to provide a novel cover for an electric saw which will detachably connect to the saw body and serve to redirect motor exhaust air laterally across the cutting position of the sawblade.
Another object of the present invention is to provide a novel shell detachably coupled to the side of a saw body for directing exhaust air across the front of a rotating sawblade for removal of sawdust or the like.
A further object of the present invention is to provide a novel means for employing exhaust air from an electric motor on a handtool across the working surface of a workpiece so as to remove debris or the like from the surface during the performance of a cutting or shaping operation.
A further object resides in providing means readily attachable to an existing saw body which will divert exhaust air from discharge vents along the side of the saw body and redirecting the exhaust across the surface of the workpiece ahead of the saw in order to clear the surface of debris, sawdust or the like.
REFERENCES:
patent: 3267974 (1966-08-01), Elson
patent: 4195403 (1980-04-01), Gruber
patent: 5084971 (1992-02-01), Remington et al.
patent: 5199174 (1993-04-01), Wild
patent: 5539985 (1996-07-01), Wershe
patent: 5689884 (1997-11-01), Wershe
Hegoas Gary M.
Hegoas Raymond L.
Hall Melissa L.
Marrs Roger A.
Peterson Kenneth E.
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