Abrading – Abrading process
Reexamination Certificate
2000-04-05
2001-07-03
Hail, III, Joseph J. (Department: 3723)
Abrading
Abrading process
C451S376000, C451S378000
Reexamination Certificate
active
06254455
ABSTRACT:
FIELD OF THE INVENTION
The following invention relates to a jig for use in sharpening cutting implements, typically for use in wood turning and/or wood carving. More particularly, though not exclusively, the invention relates to a jig for supporting and guiding a spindle and/or detail gouge enabling interaction of the gouge with a grinding wheel so as to provide a desirable fingernail shape at the sharpened end of the gouge. The invention also relates to such a jig which can also be used to sharpen a gouge such as a bowl gouge, roughing gouge, Euro spindle gouge, carving chisels and carving gouge.
BACKGROUND ART
It is known to manually support a gouge upon a support bar in front of a grinding wheel and to move the guouge using a fanning action during sharpening. This provides a less than ideal profile at the sharpened end of the gouge. In order to provide the desired fingernail shape at the end of the gouge, a “rotate and push method” ought to be adopted. That is, the gouge ought to be rotated only about its longitudinal axis while being pushed along that axis toward the grinding wheel. A fingernail profile so produced provides a desirable cutting effect when engaged with a piece of wood being turned upon a lathe.
It is known to perform the rotate and push method manually. However, it takes a skilled operator to achieve the desired result.
It is the object of the present invention to overcome or substantially ameliorate the above disadvantages and/or more generally to provide a jig for use in sharpening a cutting implement such as a gouge for use in wood turning and/or wood carving.
SUMMARY OF THE INVENTION
There is disclosed herein a jig including:
a tubular housing having opposed ends and a guide surface, the housing being mountable nearby a grinder,
a tool holder located by and guided within the housing so as to be pivotable about a longitudinal axis of the housing and slidable along the longitudinal axis, the tool holder having attachment means to secure a tool thereto such that part of the tool passes through the housing so as to present a tip of the tool toward the grinder, the tool holder further having a guide boss engageable with the guide surface such that throughout engagement a correlation exists between linear movement of the tool along the longitudinal axis and pivotal movement of the tool about the longitudinal axis, so as to enable a desired, controlled interaction between the tip of the tool and the grinder.
Preferably the grinder is a grinding wheel and the housing is pivotally mounted nearby the grinding wheel about an axis which is parallel with the rotational axis of the grinding wheel.
Preferably the guide surface of the tubular housing is annular and is at one of the opposed ends thereof.
Preferably the housing has two annular guide surfaces, one at each opposed end thereof.
Preferably one of the guide surfaces is planar, being in a plane normal to the longitudinal axis of the housing.
Preferably the other guide surface is at an acute angle with respect to the longitudinal axis of the housing. Alternatively, this other guide surface can be contoured, curved, staggered, stepped or otherwise formed.
Preferably the attachment means of the tool holder includes one or more threaded apertures through which bolts can be received, such bolts extend radially of the longitudinal axis of the housing and are tightenable upon the tool.
Where two guide surfaces are provided, two guide bosses are provided, each boss being engageable, one at a time, with a respective one of said guide surfaces.
Typically, the tool is a gouge for use in wood turning or wood carving.
Where the gouge is a spindle and/or detail gouge, it can be sharpened using the above jig by engagement of one of the guide bosses along said acutely angled guide surface.
Where the gouge is a bowl gouge, Euro spindle gouge, roughing gouge, carving chisel or carving gouge, the other of the guide bosses is typically engaged with the other guide surface; that is, the guide surface in a plane normal to the longitudinal axis of the housing. A rotational action only is required when sharpening a bowl gouge whereas a combined rotational and longitudinal motion is required when sharpening a spindle and/or detail gouge.
There is further disclosed herein a method of sharpening a gouge, the method including the steps of:
attaching the gouge to the tool holder of the above-disclosed jig such that the gouge passes through the housing with an end of the gouge presented to the grinder,
pivoting the gouge about its longitudinal axis such that the tool holder pivots and slides linearly within the tubular housing whilst maintaining contact of the guide boss with the guide surface.
REFERENCES:
patent: 3482325 (1969-12-01), Mitchell
patent: 4142332 (1979-03-01), Clarke
patent: 4483104 (1984-11-01), Welliver
patent: 4547999 (1985-10-01), Reiling et al.
Crawford John Arthur
Irvine Michael
Hail III Joseph J.
Harrison & Egbert
Nguyen Dung Van
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