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Патент USA US2406442

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Aug. 27, 1946.
L. A. sMrrH
FLY GUTTER
2,406,442
'
Filed Aug. 11., 1945
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Patented Aug. 27, 1946
i
.
l 2,406,442
UNITED li STATES. PATENT oFFlcE
FLY CUTTER
Lawson A. Smith, Los Angeles, Calif., as_signor to
Robert H. Clark, Los Angeles, Calif.
. Application August 11, 1943, Serial No. 498,214
' A'7 Claims.
,
(Cl. 77-69)
1'
This invention relates to a cutter Vand has par- '
ticular reference to that type of cutter generally
known as a fly cutter. A generalobject of _the
invention is to provide a, simpleysturdy and high
ly efficient toolof this character.
'
‘
Adjustable cutters of the type known `as fly
cutters are commonly used for various cutting op
erations, particularly for cutting round holes in
sheet materials of different kinds, and they 'op
2
form of my present invention. Fig. 2 is another
yside View of the device taken in thel direction of
lines 2-2 on Fig. 1 with a portion broken' away to y
show in section, and Fig. 3 is an end elevation
Vof the cutter, being a view taken as indicated by
line 3-3 on Fig. 1.
.
The device provided by this invention includes,
generally, a body I0, a shank Il for mounting the
erate to cut an annularjgroove or channel and 10 body in a suitable machine orioperating device, a
pair of arms.v I2 carried'by the body to project lat
thereby remove a round disc or slug. Ordinary
erally therefrom adjacent its lower end portion
devices of this character are not altogether satis
factory, due primarily to the fact that they are
not sufliciently ñrm or rigid and are such that
there is a marked tendency for them` to chatter 15 for securing the arms in the desired position rela
tive to the body, cutters I4 carried by the outer
while in use, and frequently they tend to dig
end portions of the arms to depend therefrom, re
into the work, resulting in the breakage of cut
taining means I5 for the cutters operable to ñrm
ly set 0r grip them in the desired adjusted posi
It is an object of the present invention to pro
tions, and a pilot I6 depending centrally ' from ,
vide a construction for a cutter of the character
y
referred to that is extremely simple and compact, 20 the lower end of the body IIJ.
The
body
of
the
tool
provided
by
my
invention
making it inexpensive of manufacture and high
ly practical to use.
.
is preferably in the form of a unitary block of
steel, or the like, having considerable mass and
Another object of the invention is to provide
proportioned so that it .is inherently rigid and
a simple, sturdy construction that _operates to
solid. In the preferred form of the invention
ñrmly support the cutting parts and thus elimi
the body is polygonal in cross section, for in
nates uneven operation or chatter such as com
stance it may be hexagonal as shown in the draw
monly occurs in devices of this character. y
ing. The body is made` sufficiently long to Vac
Another object of my present invention is to
- provide a cutter of the
character referred to in 30 commodate the various parts hereinafter de
scribed and its lower end 2U is preferably finished
which the cutter-carrying arms are` _supported
so that it is flat and lies in a plane normal to the
close to the lower end of the body so`that the
longitudinal axis of the body and of the tool.
space between the body and the work is mini
The shank H projects upwardly from the body
ters.
mized.
„
_
‘
.
‘
'
'
A further object of this invention is to provide
a cutter of the character mentioned in which
the cutting tools are supported so that their cut
ting parts or edges are related Vto the points at
which the cutters are supported by the arms in
concentrically therewith, and
is
preferably `
formed integral with the body as shown in the
drawing. The shank is provided as a means for
applying the tool to a machine or operating de
vice and to this end may be designed and propor
a manner so that the cutters tend to lift away 40 tioned to ñt such driving means. For ordinary
purposes kit is desirable to provide a tapered shank
from the work or be relieved rather than to dig
as is shown in the drawing.
_ 1
into the work in a manner to cause injury to the
parts.
‘
‘
The arms l2 are slidably carried in channels
2 l` formed parallel to each other in diametrically
Another object of my invention is to provide an
opposite sides of the body I0 adjacent the lower
improved pilot construction for tools operating
to make an annular cut. I provide a pilot that ' end of the body. The arms `are preferably in the
effectively holds the work and also guides the
form of elongate member _ or bars preferably
The various objects and features of my inven
square in cross section, and are adapted to be
arranged in various adjusted positions in the
channels in order to vary the positions of the
cutter.
tion will be fully understoodfrom the following
detailed description of a typical preferred fOrm
and application of my invention, throughout
which description reference is made to the accom
panying drawing, in which:
50 cutters which are carried by their outer ends.
The channels 2l which slidably carry the arms
I2 are located opposite each other in diametrical
1y opposite sides of the body and are located close
Fig. 1 is a side elevation of a typical preferred 55' to the lower end 20 of the body so that there` is
but ashort distance between the lower sides of
tion of each arm provided'with cuts 40 and ÃI; - '
theV arms and the bottom ofy the body. VThrough
the cut 4l extending inwardly from the channel "
35 so that the part d2 'defining one wall. of the
channel, can be sprung to grip the cutter. A
" clamp screw K13-is threaded to the part dâ of the
,this construction the arms are supported by the
Vzbody in a position> as close as practical to the
bottom end of the body.v
.- „
The means I3 provided for retaining or setting
ï the arms in the body may be any suitable means
end portion ofthe arm andengages the part B2
members 3i on the cap screws to bear on the
to clamp thernrinto the i
i outer faces of the arms
`marily, a pilot rod £50 slidably carried by the body
concentric with the axis of rotation and means
in a manner to'clampit tightly against the cutter.
My present invention provides an ' improved
that will adequately serve this purpose. In the
I provide cap screws 30
pilot lconstruction applicable,Í generally,¿to Vrotary '
3 preferred construction
v
`.threaded into the sides of the body which are 10 cutters or to cutters operating to make anannu
1 channeled and I provide disc shaped clamping
lar cut in the work. My invention provides, pri
the cap screws the
l channels 2|. By tightening
are effectively forced
i clamping
members
3|
Vinrconnection with the pilot rod 6% Vto normally
yieldingly ,urge it downward from the lower end
.
against the arms to lfirmly secure them against 15 of .the bodyv to engage Athe work as the cutter
operates. The invention further provides means
longitudinal movement in the channels.
I4 are elongate bodies of cutting 1
Y The cutters
1 material, such as tool steel, carried in channels '
for retaining the-'pilot rod in the body and a
„pressure plate 6i in connection with the pilot
1 35 formed substantially vertically Yin the> outer
rod to bear on the work.
practice the lower
..
`
.
In the preferred construction'the body is pro
` end portions of the armsi 2. In
end portions of the >cutters Iâ are finished or
videdwith arcentral socket 62 extending into it
from its lower end. The socket' may be formed
dressed so that each cutter has ya lower cutting
edge 36. The lower cutting edges 35 of thecut
by providing .a central boreintheA body from its
lower end. The pilot rod may be a plain,`straight,
ters are pitched from the horizontal so that each
cutter has a lower cutting point 31 and the two 25 4round .bar which'slidablyV fits l.the ‘socketuâZ and
that the point 31 of` thev
proportioned so that its/lower end> portion' >pro
>cutters are dressed so
jects aV suitableV distance ‘fromthe lower >end of
cutter A_is at the inner end of the edgeââ while
end`
thebody It, while `its'upper `end terminates a
the point 31 of the cutter Bf is at the outer
'
the cutterex-`
suitable distance short of the upper end ofthe
,
'or the edge se. The sideY 31a of
tending up from the lpoint is preferably dressed V30 socke`tlì2'."’V
'mi
'
i
'
to recede and have clearance vas the A_cutter
VA compression _spring ‘63 'is arrangedÈ in vthe> '
socket 62 above the rod '60 orY between the top of
the rod and the upper'end of the socket, so ‘that
In accordance with my invention the cuttersv
it normally ' yielding'ly urges'the' rod downwardly.
advances.
’
'
"
'
'
`
i4 are disposed so that they do not track ‘1n .eX
actly the same paths but rather the cutter A
Various means may Vbe provided for retaining
operates to cut the inner 'portion or wall of the
the rodin .the socket. Inthe construction shown
I have provided a reduced portion’ßli at a suitable
cut vwhile the cutter B operates to cut the outer
point along the length of the rod, that is," at Aa
portion or wallof the cut. This 'may be accom
poinit'withi'n the body lll, and'ï‘have provided
plished by dressing the cutters so thatv their cut
ting edges and points are suitably disposed. 40. a stop Yscrew ’S6 in 4the 'bodyto project finto :the
However, in practice it is desirable to formthe
socket to the reduced portionßä of the'rodït'oiact .Y
as a stop limiting the longitudinal mcvem‘entof
channels 35 which carry the cutters softha’t the
the rod in the socket.i The lower end'portion of
g cutting parts of the cutters are properly located.
the rod is provided with a' point or` center> 66
in the case illustrated the channel which carries
the cutter A supports -it so4 that it is in a truly
45 lwhich may be used to engage the work, "
vertical position when viewedas shown in Fig. l,
while the channel 35 which Vsupports the cutter
B is >pitched downwardly andjoutwardly enough
stanceto ,engage
to locate the point, 31 of the cutter B a suitable
distance outward of the path of the cutter A. "
In accordance with rny invention the channels
center .holel >erneuter punch
mark provided inthe work. I-n‘acocrdance
50
35 Vin the arms i2 carrying theV cutters vlll are
pitched downwardly and rearwardly with refer
'with .
’
my inventionIprovi'de .a Vpressure `plate 61 that
can be used inr connection’ with 'the' pilot rod.>
This vplate may‘beinthe'fo'rm of a disc having" a
central'tapered socket ’61 designed to 'be'l engaged
bythe point 63 of the pilot rod. ,'The-Ibßlìlìom
face SS of the plate Vlili is flat and designed-»to
bear on the work, giving a largebearing surface
ence to the direction of rotation of the cutter
so that the cutting points and edges of each cut 55 ¿to have a clamping effect. When . the tool is
yarm and rearward of
v
being used to cut gaskets, orvthelikeg’forfin
' ter are located below the
the point at which the cutter is supported‘by the
arm with reference to the direction in which the
cutter'is rotated. Y. Thaty is to say, the cutters Ilil
stance, whenit is being used on materialsthat
are soft or flexible, it is desirable to ._usethe
pressure ‘plate 6l as'it 4will have a desirable hold
are pitchedY to depend ldownwardly and, rear V60 ingor clamping effect A(in the partr which'is‘icut
wardly relative to the directio'nof-cut so that
outY by the action of thetool. ' VWhen the tool is
'being used on harder materials or metals "it'jniay
their cutting parts are behind the point ati which
the cutters are supported by the arms. Through
be sufiicient to merely allow the center Gs'ofîthe
this construction, should thecutters feed too fast
Apilotrod .to engage ra small pilot hole Yor center
Y
into the material, they willV tend to be forced
'
Vpunch markprovided in the work.’ ¿The spring
rather than '
back and to lift from the material
Y
Vt?, mayîbe Ymade ïsucl?ir as `to` exert 'af suitable
to bite into it. It is to be understood, of course
that theforward >facesrât of the cutters imme
diately above the edges 35 are dressed yorffaced
may _be varied according _to the :work being'ïdo'n’e.
amount of pressure on the pilot rod' and .this
so that the cutters give the chips the desired 70
The spring-may be such as to merely provide a
holdingpressure to hold >the work in placeborit
clearance.
may be made fairly strong, so thatA it acts' to _eject
.
The means l5 provided byl my invention for re
!4 in the desired adjustedlpo
taining the cutters
the .part cutout by the action of Ythe,toolgvjl,v »
In using the device .theîarms `L2 are adjusted
sition may vary’as circumstances require, . In the 7.5 fito .project the;
' >case illustrated I have shownathe'outer `end por
desired :distances ‘fromî theggbody
2,406,442
and are set in such adjusted positions by the
means I3.
I4 are arranged in the
4. A cutter of the character described includ
ing a central elongate body notched at opposite
sides to have transversely disposed cutter carry
' ing channels in it at diametrically opposite sides '
parallel to each other and adjacent the lower
end of the body, arms slidably carried in the
overlap while the path of the cutter A extends
inwardly from that of the cutter B so that the
cutter A makes the inner portion of the out while
the cutter B makes the outer portion of the cut.
During the cutting operation the pilot rod, or the
pilot rod with the pressure plate under it, bears
on the work, -
`
channels to project laterally from the body, means
applied to the exterior of the body at the sides
of the body for clamping the arms in the chan
- nels against movement in the channels, and cut
ters carried by the projecting end portions ofthe
arms to depend therefrom.
5. A cutter of the character described includ
ing a central elongate body having laterally dis
posed cutter carrying channels formedsin it at
diametrically opposite sides, arms slidably car
ried in the channels to be parallel with each
other and to project from the body, means forV
clamping the arms against movement in the chan
nels, and cutters carried by the projecting por
tions ofthe arms to depend downwardly there
the rod and holding the
work, particularly the slug or disc portion that is
cut out by the tool.
.
v
Having described only a typical preferred kforni
and application of my invention,v I do not wish
to be limited or restricted to the speciíic details
herein set forth, but
wish to reserve to myself v
any variations or modiñcations that may appear
scope of the following claims:
Having described my invention, I claim:
1. A cutter of the character `described includ
ing a central elongate body having outwardly
opening cutter carrying channels formed in it at
diametrically opposite sides and at right angles
to the longitudinal axis of the body, arms slid
n:
c..
from and. rearwardly of the direction of cut so
the cutting edges of the cutters are behind the
points where the cutters are supported by the
cutting edge being pitched and termi
nating in a cutting point, the paths of cut of the
the arms laterally of the longitudinal axis of the
body to hold them against movement in the
cutters overlapping and the point of one cutter
being at the inner end ofthe edge and the point
of the other cutter being at the outer end of the ‘
edge.
6. `A cutter ofthe character described includ
channels including clamp> members engaging the
ving a central elongate .body having outwardly
ably carried in the channels to project laterally
from the body, means for individually clamping
arms to bear on them laterally of the axis of the
opening cutter carrying channels formed in it
body and a screw member operating each clamp j. at diametrically opposite sides and at right, an
gles to the longitudinal axis of the body, arms
member, and cutters |carried by the arms to de- f
pend therefrom.
slidably carried in the channels to project later
2. A cutter of the character described includ
ing a central elongate body having open cutter
carrying channels formed in it from diametri
ally from the body, means for individually clamp
cally opposite sides extending at right angles to
the longitudinal axis of the body, arms slidably
carried in the channels to project laterally from
the body, means for individually clamping the
ing the arms against movement in the channels,V
there being a central opening extending into`
the body between the channels, a pilot member
carried by said opening to project from the lower
end of the body, a spring in the opening normally
yieldingly urging the pilot downward, and cutters
carried by the arms to depend therefrom.
arms against movement in the channels, and cut
ters carri d by the arms to depend downwardly
7. A cutter of the character described includ
ing a central elongate body having laterally open
therefrom and rearwardly of the direction of -cut
ing transversely dispo
`
so these cutting parts are behind the points at
which the cutters are supported by the arms.
3. A cutter of the character described includ
ing a central elongate body having transverse 50
cutter carrying channels formed parallel to each
other in opposite sides of the body and open at
their outer por-tions, arms slidably carried in the
channels to project from the body, means for in
dividually clamping the arms laterally of the
longitudinal axis of the body and against the
bottoms of the channels so theyare held against
movement in the channels, and cutters carried
by the projecting portions of the arms to depend
therefrom.
LAWSON A. SMITH.
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