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Патент USA US2127289

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Aug. 16, 1938.
_ H. CORRALL ET Az.
2,1275289
HONING DEVICE
Filed Feb. 5, 1956
2 Sheets-Sheet l
Aug- 16, »1938.
H. coRRALL Er AL
'
2,127,289
HONING DEVICE
à Filed Feb. 5, 1935
2 Sheets-Sheet 2
N
(lll
SMO/WW
2,127,28t
Patented Aug. 16, 1938
orties
2,127,289
HONING Dill/'ECE
Herbert C‘orrall, St. Alban, Helensburg, and Ber
tram A. Stevens, Clydebanlr, Scotland, as
signors to The Singer Manufacturing Company,
Elizabeth, N. E., a corporation of Nets.Y .Hersey
Application February 5, 1936, Serial No. 62,4%
în Greaiîßri‘tain September 3, N35
7 Claims.
0
(Ci. 5l-69)
This invention relates to a sharpening device
and more particularly to a hand operated sharp
ening device which may be used to sharpen the
underedge trimmer blades used with sewing ma
chines for the purpose of trimming the edge of
the lower of the superposed plies of material be
ing sewed.
One of the objects of this invention is to pro
vide a simple, inexpensive, manually operable de
vice for quickly sharpening the cutting edge of
an underedge trimmer blade, the device embody
ing several adjustments by means of which the
path of movement of the sharpening member
may be adjusted so as to cause said member to
accurately and uniformly sharpen the cutting
edge. A further object of the invention is to pro
vide a sharpening member which is reciprocable
through a guide mounted for universal move
ment, the guide permitting angular adjustment
of the sharpening member about an axis parallel
to its length. A still further object of the inven
tion is to provide a sharpening device for sharp
ening under-edge trimmer blades which may be
successfully used by a person having no more
than ordinary common skill in the use of sharp
ening implements.
With the above and other objects in view, as
will hereinafter appear, the invention comprises
the devices, combinations, and arrangements of
parts hereinafter set forth and illustrated in the
accompanying drawings of a preferred embodi
ment of the invention, from which the several
features of the invention and the advantages at
tained thereby will be readily understood by
those skilled in the art.
'
«
In the drawings:
Figure l is a top plan view of the blade-sharp
ening device, showing a blade held in the support
ing clamp and the sharpening stone in its oper
ative position.
Figure 2 is a vertical sectional view taken sub
45
stantially through the center of the guide for the
sharpening element.
Figure 3 is a central vertical section taken
through the device, the sharpening element and
its holder being shown in elevation.
Figure 4 is a vertical cross-section taken sub
stantially along the line 4_4, of Figure l.
In the embodiment illustrated this device com
50 prises a rectangularly shaped bed i ü formed with
an upstanding centrally apertured boss l i.
Fitted into the aperture in the boss is a sleeve i2
formed with a groove i3 which receives one end
of an adjusting screw I4. The groove i3 is larger
than the end of the screw I4 and this construc
tion permits the sleeve l2 to be adjusted verti
cally.
Journaled for turning movement about a` verti
cal axis in the sleeve i2 is a shouldered screw
i5 threaded into the U-shaped bracket it and - <
between the upstanding arms of the bracket
there is pivotally mounted on the pivotal screws
ii and i8 a collar i9 which is adapted to be
turned about its horizontal axis. The collar I9
encircles a guide member
having a groove 2l
in its outer periphery and into which the ends of
the screws il and it extend. The thumb-screw
it is adapted to engage the walls of the groove
it
2i to prevent turning of the guide E@ relative to
the collar i9. This construction permits the
guide to be rotated relative to the collar for the
purpose of adjustment and provides means for
locking the guide in any adjusted position.
The sharpening member comprises a rectangu
larly shaped. rod 22 provided with a handle 23
.and lugs
having bifurcated ends which extend
over the ends of the triangularly shaped sharp
ening stone 2t. The lugs 2d are removably fixed
to the rod
by the screws 2S and pins 2l.
riî'he edge of the base opposite the boss Ii is
Íormed with an upstanding portion
having a
horizontally disposed groove E@ (Fig. 3) in its
top which receives the clamp or holder for the
trimmer-blade. The clamp is formed of two
parallel fiat metal bars all, 32 (Fig. e) held to
gether at one end by the shouldered screw 33
and at the other end
a thumb-screw
The
trim ner blade 35 is clamped between the ends of
the bars nearest the thumb-screw 35i and is held
in its correct position by the studs St carried by
the bar 32. it is to be understood that the
shouldered screw
has a loose nt with the bar
3i and therefore the clamping ends of the bars
3i and Si? are separated by the spring 3l when
the thumb-screw 3d is loosened.
To position the blades at the correct angle rel
ative to the guide for the sharpening member an
upstanding post 35i is formed at one corner of
the base i@ and mounted in the post are stops
39 and ¿iii (Fig. i) which are adapted to be held
in their adjusted positions by the screws GI and
42, respectively. These stops are used separately
depending upon the shape of the blade which is
to be sharpened.
To sharpen a blade
is first clamped in the 50
blade-holder by the thumb-screw 34 and the
holder is placed in the groove ‘£9 on top of the
11p-standing portion
The holder is then moved
longitudinally ci the groove
until the end of
the blade 35 abuts the end of one ofthe adjust 55
2
2,127,289
able stops 39 or 40. The sharpening member is
then placed on the gauge rest 43 formed on the
upstanding portion 28, the screw I8 is loosened
and the sharpening member is turned about its
5 longitudinal axis until the lower side of the
for movement about a vertical axis, a supporting
element pivotally secured to said bracket for
movement about a horizontal axis, a guide-mem- '
ber provided with an opening and means for
adjustably supporting 'said guide-member in
stone 25 lies ñat on the upper surface of the said supporting element for movement about the
gauge rest 43. The screw I8 is then tightened longitudinal axis of said., opening and relativeto
in order to hold the sharpening device in its cor
said supporting element..
,
rect position. The screw I4 may be loosened and,
4. A sharpening device of the class described
the sleeve raised or lowered to adjust the guide comprising, a base formed with an upstanding
to thedesired height. The sharpening member portion at one edge thereof [and having a groove
is then swung to the position shown in Fig» 1 and in its top, a blade-holderin said groove, an
freciprocated by means of the handle 23 which is
grasped in the hand of the operator and moved
back and forth in a manner readily understood.
It will be observed that the support for the
adjustable stop carried by said bed and against
which' one end of a blade isadapted to abut,
a `U-shaped bracket mounted y`on said base for 15
movement about a vertical axis,"za supporting ele’
guide permits the sharpening member to be ment pivotally secured to said bracket for move
, swung in both the horizontaland~vertieal~planesç-‘mrent aboutfla lhorizontal axis, a guide-member
and is, in effect, a universal joint. It will also ' formed with an opening, a sharpening stone car
be observed that three adjustments may be made;
rying bar' having one pf Vits ends extending
ñrst, the guide carrier may ber raised or lowered;
through said opening, said bar and. opening
second, the sharpening memberI may be adjusted ' being shaped so as to prevent turning movement
about its horizontal axis and third, the position of the bar in said opening, means fon‘adj’ustably
of the trimmer blade may be determined by the supporting said guide member in said support
2 Ul adjustable stops 39 or 45. This construction
ing element for movement about the longitudinal
enables the guide tc be accurately adjusted to axis of said bar anda handle for moving said
guide the sharpening stone 25 at the correct angle ' bar back and forth through the
relative to the cutting edge of the trimmer blade,
which is at the foot of the upstanding portion 35'
5. A sharpening device of the class described
30 of the blade 35, and provides means for uniformly
comprising, a base formed with an upstanding 30y
sharpening the edge when used by operators hav
portion at one edge thereof and having a groove
ing no particular skill in the Yuse of sharpening in its top, a blade-holder in said groove, an ’ad
guide.
implements.
_
'
From the foregoing description it will'be ob
35 vious that theelements >employed are susceptible
of material variations. The privilege is therefore
reserved» of resorting to all such legitimate
changes therein'as may be fairly embodied within
the ‘spirit and scope of the appended claims.
Having thus set forth the nature of our'in
40
vention, what we claim as new and desire to
Vsecure by Letters Patent is:--
u
l. A sharpening device ofthe cl'as’sf‘dësc?ibed
comprising, a base, a blade-holder carried by said
45 base, a support on said base, a guide pivotally
mounted on lsaid support, a rod extending
'
.
.
justable stop carried >by said bed and against
which one end of a blade is adapted to", abutjïa
bracket mounted on said base for movement 35
about a vertical axis, a supporting element pivot-~
ally secured to said bracket for movement »about ix
a horizontal axis, a guide-member formed with
an opening, a sharpening stone carrying bar
having one of its ends extending through said
opening, said bar and opening being shaped so
said opening, means for adjustably Supporting _ ~
said guide member in said supporting »element
for movement about the longitudinal axis of said
bar and means for maintaining said guide mem
through said guide and carrying a sharpening
ber in its adjusted position.
stone, said guide and rod‘being shaped so as to
6. A sharpening device of the class described
comprising, a base, a blade-holder carried by said
base, a U-shaped support pivotally mountedv on
said base, a collar pivotally secured between the
prevent the rod and guide from turning relative
50 to veach other, means for adjustably supporting
said guide in said support for movement about
the longitudinal axis of said rod and clamping
means for holding s-aidguide in 'its adjusted posi
tion.
2. A sharpening device of the class described
55
comprising, a base, a blade-holding clamp carried
by said base, an adjustable stop carried by said
base and against which the blade is adapted to
abut to position the latter, a support pivotally
6 mounted on saidrbase for movement about hor
izontal and vertical axes, a guide-member, a rod
carrying a sharpening stone and extending
through an opening in said guide, said opening
and rod being constructed to prevent turning
65 movement relative to each other, means for ad
justably supporting said guide-member in said
support for movement about the longitudinal axis
of `said rod, clamping means for holding said
guide-member in its adjusted position, and a
70 ¿ handle on said rod by which it may be moved '
A back and forth through the opening in said guide.
40"",
...as to prevent turning movement of the bar in . j..
45'.
.
50 Y.
arms of said U-sh-aped support, said collar be- ~ '
ing movable about a horizontal axis, a guide
provided with an opening, a rod extending
through the opening in said guide and carrying
a sharpening stone and means for adjustably 55
supporting said guide in said collar for movement
relative to said collar and about the longitudinal
axis of said rod.
'7. A sharpening rdevice of the class described
comprising, a base, a blade-holder carried by said 60
base, a support mounted on said base for move
ment about a vertical axis, means for adjustably
supporting said> support so that its position rela
tive to the base may be varied, a guide, a rod
extending through said guide, said rod and guide 65
having interlocking engagement'to prevent the
rod from turning in said guide but permitting
endwise reciprocation of the rod, means for ad
justably supporting said guide in said support
for ymovement about the longitudinal axis of
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