U.S. patent number 3,721,049 [Application Number 05/159,286] was granted by the patent office on 1973-03-20 for base for whetstone.
Invention is credited to Mitsue Nakahara.
United States Patent |
3,721,049 |
Nakahara |
March 20, 1973 |
BASE FOR WHETSTONE
Abstract
A supporting base for a sharpening stone consisting of an
elongated downwardly facing channel having downwardly inclined end
portions presenting sharp corners at their bottom ends adapted to
penetrate the surface of a work bench. The channel has a pair of
spaced upstanding stops along one longitudinal margin, an
upstanding fixed transverse stop at one end and a slidably
adjustable upstanding transverse stop at its other end, so that
sharpening stones of different lengths may be accommodated, between
the upstanding stops.
Inventors: |
Nakahara; Mitsue (Honolulu,
HI) |
Family
ID: |
22571903 |
Appl.
No.: |
05/159,286 |
Filed: |
July 2, 1971 |
Current U.S.
Class: |
451/552 |
Current CPC
Class: |
B24D
15/02 (20130101) |
Current International
Class: |
B24D
15/00 (20060101); B24D 15/02 (20060101); B24d
005/00 (); B24d 007/00 () |
Field of
Search: |
;51/211R-213R |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Simpson; Othell M.
Claims
What is claimed is:
1. A supporting base for a rectangular sharpening stone comprising
an elongated main body member having downwardly and outwardly
inclined end portions provided with relatively sharp opposite
bottom corners adapted to penetrate a subjacent supporting table
surface, an upstanding first stop member fixedly secured to one end
of the main body member, a second upstanding stop member, means
slidably connecting the second stop member to the main body member
adjacent its opposite end for longitudinal adjustment along said
main body member, and means to clamp said second stop member in an
adjusted position on the main body member, wherein said main body
member is formed with a longitudinal depressed channel adjacent
said opposite end and said second stop member is provided with a
tongue element slidably fitting beneath said depressed channel.
2. The supporting base of claim 1, and wherein said tongue element
has a longitudinal slot and said clamping means comprises a bolt
extending through the floor of said depressed channel, slidably
engaged through said slot and provided with a clamping nut beneath
the tongue element.
3. The supporting base of claim 2, and wherein said tongue element
is channel-shaped to slidably embrace said depressed channel.
4. The supporting base of claim 3, and wherein the bottom surface
of said depressed channel is provided with a length scale.
5. The supporting base of claim 3, and wherein said main body
member is formed with a relatively wide longitudinal slot adjacent
said opposite end, said second stop member having vertical opposite
side edges formed with notches slidably receiving the opposite
longitudinal edges of said relatively wide slot.
6. The supporting base of claim 3, and wherein both stop members
are resilient and have inwardly opposing stop flanges.
7. The supporting base of claim 6, and wherein said stop flanges
have inner abutment portions inclined in a transverse
direction.
8. The supporting base of claim 7, and a plurality of upstanding
spaced stop elements on said main body member adjacent one
longitudinal edge thereof.
9. The supporting base of claim 8, and wherein said main body
member is of downwardly facing channel-shaped cross-section and
said opposite bottom corners are substantially of right-angled
shape.
Description
This invention relates to supports for grindstones, and more
particularly to an adjustable supporting base adapted to receive
and hold a rectangular sharpening stone and to maintain the
sharpening stone stationary while it is being used on a work bench
or similar supporting surface.
A main object of the invention is to provide an improved supporting
base for a sharpening stone, the base being of simple construction,
being adjustable to accommodate different sizes of sharpening
stones, and having means for automatically holding it in a fixed
stationary position as sharpening pressure is applied thereto by
the tool being sharpened.
A further object of the invention is to provide an improved
adjustable supporting base for a sharpening stone, the supporting
base being very inexpensive to manufacture, being durable in
construction, being compact in size, and being arranged to
efficiently support a sharpening stone and to maintain the stone in
a fixed stationary position as it is being used.
Further objects and advantages of the invention will become
apparent from the following description and claims, and from the
accompanying drawings, wherein:
FIG. 1 is a top plan view showing a rectangular sharpening stone
supported in an improved base constructed in accordance with the
present invention.
FIG. 2 is a side elevational view of the sharpening stone and base
of FIG. 1.
FIG. 3 is a bottom plan view of the supporting base as employed in
FIGS. 1 and 2.
FIG. 4 is a transverse vertical cross-sectional view taken
substantially on line 4--4 of FIG. 2.
Referring to the drawings, 11 generally designates an improved
supporting base for a sharpening stone in accordance with the
present invention. The base assembly 11 comprises an elongated main
body member 12 in the form of a downwardly facing channel of sheet
metal or the like, the channel having downwardly and outwardly
inclined opposite end portions 13 and 14, the included angle
between the end portions and the main portion of the elongated
channel-shape body being of the order of 140.degree., as shown in
FIG. 2. Thus, the channel-shaped body 12 has depending longitudinal
flanges 15, and said flanges are suitably notched out so that when
the end portions 14 are bent downwardly in the manner illustrated
in FIG. 2, the edges of the flanges at the cut-out portions thereof
meet, as shown at 17. The end portions 13 and 14 therefore have
downwardly facing right-angled end corners 18 which act as
penetration spurs and embed themselves in the surface of a work
bench or other similar supporting surface when downward force is
applied to the main body portion of the supporting base, as will be
presently described.
A fixed upstanding stop member 19 is struck upwardly from one end
portion of the body member 12, traversing the fold line 20
associated with the downwardly inclined end element 13, as shown in
FIGS. 1, 2 and 3. The stop member 19 has a substantially vertical
upstanding, somewhat resilient portion 21 and a substantially
horizontal top leaf portion 22 which is directed inwardly relative
to the inclined outwardly extending end portion 13. The inner
abutment portion 23 of the leaf member 22 is inclined upwardly and
outwardly in a transverse direction, namely, is inclined upwardly
and away from the rear longitudinal marginal portion 24 of the
base, as viewed in FIG. 1. A pair of upwardly struck rear lugs
25,25 are provided respectively adjacent the end portions 13 and 14
of the base, said lugs 25,25 acting as rear stop elements for a
typical rectangular grindstone 26 disposed on the base.
The main body 12 is formed adjacent its left end, as viewed in FIG.
1, with a relatively wide slot 27 in which is adjustably mounted
the left upstanding stop member 28. The stop member 28 has a
vertical upstanding portion 29 which is formed with opposite
rectangular notches 30,30 slidably receiving the opposite
longitudinal edges of the relatively wide slot 27. The stop member
28 is further provided with a longitudinally extending bottom
tongue 31 which is generally channel-shaped and which has the
respective upwardly and outwardly inclined side flanges 32,32. The
main body member 12 is formed with a longitudinally extending
channel-shaped depression 33 which is received in the
channel-shaped tongue 31 and along which said tongue is slidable,
the tongue being formed with a longitudinal slot 34. A clamping
bolt 35 extends through an aperture provided therefor in the
depressed longitudinally extending portion 33, the bolt 35
extending slidably through the slot 34 and being provided with a
clamping nut 36 for clamping the tongue 31 in an adjusted position
along the channel-shaped depression 33. The bottom surface of the
channel-shaped depression 33 is provided with a length scale 37
which is calibrated in accordance with different lengths of
grindstones 26 which may be accommodated between the stop members
19 and 28.
The stop member 28 is provided with an inwardly directed horizontal
top flange 38 having an inner abutment portion 39 inclined upwardly
and forwardly in a transverse direction, similar to the
transversely inclined abutment portion 23 of the fixed stop member
19. The vertical wall 29 of the adjustable stop member 28 is
somewhat flexible, similar to the vertical wall portion 21 of the
fixed stop member 19.
The inner corners of the abutment portions 23 and 39 are preferably
beveled, as shown at 40, to facilitate the insertion of a
grindstone 26 between said abutment portions.
In using the supporting device 11, the adjustable stop member 28 is
first set to its proper position in accordance with the length of
the sharpening stone 26 intended to be placed thereon, as indicated
by the transverse edge 41 of tongue 31 with reference to the scale
37. The adjustable stop member 28 can then be clamped in this
position by tightening the clamping nut 36. In this position the
spacing between the transverse inner edges of the abutment elements
23 and 39 is slightly less than the actual length of the grindstone
26, so that when the grindstone is inserted between the abutment
elements 23 and 39, the upstanding resilient wall elements 21 and
29 will be flexed outwardly slightly so as to develop resilient
clamping pressure on the opposite transverse ends of the
grindstone. The grindstone is inserted in a direction indicated by
an arrow 42 inscribed on the front marginal portion of the base
member 12, the grindstone eventually coming into abutment with the
upstanding rear stop lugs 25,25. The device is now ready for use.
In using the grindstone supported in the device 11, as above
described, the honing force applied by the application of the tool
to the top surface of the grindstone tends to force the sharpened
corner elements 18 into the subjacent work table or supporting
surface, which provides a binding effect preventing the stone from
slipping along the work table as the sharpening action takes place.
The right-angled relatively sharp corner elements 18 therefore
serve to maintain the stone in a stationary position while it is
being used and thereby greatly facilitates the sharpening
process.
Since the vertical wall portions 21 and 29 of the end stop elements
are resilient, the grindstone 26 may be easily removed, reversed,
and replaced, as required.
It will be noted that the relatively wide notch 27 traverses the
left-end fold line 45 adjacent the downwardly inclined left-end
member 14, and that the slot is somewhat enlarged in member 14, as
shown at 46 to permit the assembly of the adjustable stop member 29
with the main body member 12, and to conversely allow the main stop
member 29 to be at times removed, for example, when the device is
taken apart for cleaning.
While a specific embodiment of an improved supporting base for a
sharpening stone has been disclosed in the foregoing description,
it will be understood that various modifications within the spirit
of the invention may occur to those skilled in the art. It is
therefore intended that no limitations be placed on the invention
except as defined by the scope of the appended claims.
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