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Патент USA US2131626

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SePt- 27» 1938?
.
R. |_. KEITH
,
'
2,131,626
SHARPENING JIG
Filed Aug. 6, 1937
6
7
2 Sheets-Sheet l.
Inventor '
A iiorney?s
Sept. 27, 1938.
SHARPENING
R |_,‘ KEITH
JIG
Filed Aug. 6, 1957
' '
I
2 Sheets-Sheet 2
Inventor
7%
Patented Sept. 27, 1938
. 2,131,626
UNITED ‘STATES,
PATENT OFFICE!
' 2,131,626 ‘
SHARII’ENINGY JIG
,
Raymond L. _Keith, De Land, Fla.
Application August 6, 1937, Serial No.;‘15'7,794
‘
'2, Claims. (01. 51—158)
This invention is a sharpening jig and has as wing nut equipped bolts 2| rising from the plate
It) and accommodated in arcuate slots 22 pro
its object the provision of a device of this char
vided in plate 20 adjacent to relatively opposite
acter particularly designed for sharpening chis
els, bits, and the blades of planes and analogous ends of the plate as shown in Figure 3.
Plate 20 is disposed over an opening 23 pro
,6, tools; and the invention together with its objects
and advantages will be best understood from the vided in the plate I0, and is itself equipped'with
following description taken in connection with a rectangular opening 24 that accommodatesthe
blade 25 to be sharpened.
the accompanying drawings wherein,
Adjacent one end of the opening 24 plate 20
Figure 1 is a side elevational View of the jig,
has struck-up therefrom a web 26 through which 10..
10 Figure 2 is a top plan of the base of the jig,
is threaded a clamping bolt 21 provided with a
Figure 3 is a top plan view of the plate assem
clamping head 28.
bly forming part of the jig,
*
At opposite sides of the opening,“ there are
Figure 4 is a perspective view of a blade sup
porting member,
.15.
_
Figure 5 is a perspective view of the upper end
of a supporting post.
Referring to the drawings more in detail it
will be seen that in the preferred embodiment
thereof, the sharpening jig comprises a base plate
20 5 provided in the top face thereof and adjacent
provided integral depending ?anges 29 between
the lower corners of which is pivoted as at 30
a blade supporting plate or member 3|.
Plate 3| has hinged to the underside thereof
as at 32, a slotted supporting brace 33 that is
adapted to rest on the plate 20 and accommo
dates in the slot thereof a wing nut equipped 20
opposite longitudinal edges thereof with longi
tudinally spaced, continuous grooves 6, '|, elon
gated longitudinally of the base plate.
bolt 34 rising from the plate 20. Obviously
through the medium of the brace 33 and wing
Between one pair of grooves, as for example
the grooves 6, plate 5 accommodates thereon an
oil stone 8 or other suitable abrasive element;
plate 5 having struck-up therefrom suitably posi
3| may be held in the desired angle of inclina
tion with the blade 25 to be sharpened clamped 25
between the plate 3| and the head 28 of adjusting
screw 21, as will be clear from a study of Fig
tioned retaining clips or ears 9 to engage at oppo
ure .1.
site sides and the respective opposite end edges
30 of the abrasive element 8.
A relatively shorter rectangular plate I0 is sup
ported at one end thereof through the medium
of legs or standards I I and at the relatively oppo
site end thereof through the medium of legs or
35 standards |2.
The legs or standards I l are provided in their
lower ends with sockets to accommodate balls
or other suitable anti-friction elements l3 that
ride in the grooves 6. At their upper ends the
40 legs or standards II have reduced extensions l4
that extend through openings provided in the
corner portions of the plate It! and are provided
with collars |5 that are retained on the exten
sions |4 against rotative movement, but in a
45 manner to permit longitudinal or vertical move
ment of the collars on the ends l4 through the
medium of pins |6 that are accommodated in
slots |'| provided in the ends M of the legs or
standards ||.
Springs l8 are disposed about the reduced ends
50
M of the legs or standards I | and are interposed
between the plate In and shoulders l9,
Resting ?atly on the plate I0 is a smaller plate
20 that is secured at the desired angular adjust
55 ment on the plate l0 through the medium of
nut equipped bolt 34 the blade supporting plate
It will thus be seen that with this device the
blade 25 is held at the desired angle of inclina 30
tion with the edge thereof to be sharpened engag
ing the top surface of the abrasive block 8.
With the blade thus supported in engagement
with abrasive block 8 the carriage 35 consisting
of the aforementioned plate l0, plate 20 and as 35
sociated parts, legs II, and the legs |2, which lat
ter at their upper ends are riveted to one end of
the plate ID at the corners thereof, and at their
lower ends are provided with sockets accommo
dating balls or anti-friction elements 36 working
in the grooves ‘I, said carriage 35 may be caused
to travel back and forth and laterally from one
side to the other as controlled by the cooperating
grooves Band balls l3, and cooperating grooves
‘| and balls 36 so that the edge of the blade 25 45
is moved in corresponding direction over the sur
face of the block 8 to effect a sharpening of the ,
blade edge in a positive, quick and e?icient man
ner. Obviously by adjusting the plate 20 to the
desired angle relative to the plate I0 the edge of 50
the blade to be sharpened may be held in the de
sired oblique angle to the length of the abrasive
stone 8 as may be required for a more effective
sharpening of the blade edge.
Also springs |8 provide a yielding support for 55
2,131,o2e
one end of the plate l0 and associated parts
whereby pressure of the hand on the plate l0 may
be utilized for controlling the amount of pressure
with which the edge of the blade 25, being sharp
ened, will be brought into and maintained in con
tact with the surface of the abrasive element 8.
It is thought that a clear understanding of the
construction, utility and advantages of an inven
tion of this character will be had without a more
10
detailed description,
_
,
Having thus described the invention, what is
claimed as new is:
1. A blade sharpening jig comprising a base
"
ing member and said clamping screw cooperating
to .clamp a blade to be sharpened therebetween.
2. A blade sharpening jig comprising a base
plate provided in the top surface thereof with
pairs of opposed, endless elongated grooves, means
on said base plate for engaging and securing an
abrasive block in position on the base plate, a
carriage including a plate, supporting legs for
the plate, and anti-friction means on the lower
ends of the supporting. legs engaging in said 10
grooves for controlling the direction of movement
of said carriage relative to said plate and the
abrasive element thereon, and a blade holding
plate provided in the top surface thereof “with, and clamping device mounted on the plate of said
15 pairs of opposed, endless elongated grooves, means ‘carriage, said blade holding and clamping device 15
on said base plate for engaging and securing an including an apertured plate mounted on the car
riage plate ‘and provided at one end of said aper
abrasive block in position on the base plate, a car
riage including a plate, suppdrting legs for the" ‘ ture with aniupwardly directed ?ange, a clamp
plate, and anti-friction means on the lower ends.
20 of the supporting legs engaging in said‘grooves
for controlling the direction of movement of said
carriage relative to said plate and the abrasive
element thereon, and a blade holding and clamp
ing device mounted on the plate of said carriage,
said blade holding‘and clamping device including
an apertured plate mounted on the carriage plate
and provided at one end of said aperture with
an upwardly directed ?ange, a‘ clamping screw
threaded through an opening in said ?ange, said
30 apertured plate also having ?anges depending
therefrom at opposite sides of- the aperture, a
blade supporting member pivoted at one end be
tween said ?anges, interengaging means on said
apertured plate and said blade supporting mem
35 berrfor securing the latter at the desired posi
tion of angular adjustment, said blade support
ing screw threaded through an opening in said
?ange, said apertured plate also having ?anges 20
dependingtherefrom at opposite sides of the aper
ture; a blade supporting member pivoted at one
end between said ?anges, interengaging means on
said, apertured plate and said blade supporting
member for securing the latter at the desired posi
tion of angular adjustment, said blade support
ing member and said clamping screw cooperating
to clamp a blade to be sharpened therebetween,
25
and" means resiliently connecting said carriage
plate- at one, end thereof to its supporting legs 30
whereby pressure of the blade to be sharpened
against the abrasive element may be regulated at
the will of the operator, and means for securing
said apertured plate on the carriage plate for
angular adjustment relative to the carriage plate. a 5
RAYMOND L. KEITH.
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