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Патент USA US2412937

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Dec. 24, 1946.
Filed June so,v 1944
2 Sheets-Sheet 1
IA I |‘Il:,
Dec. 24, 1946.
Filed June 30, 1944
2 Sheets-SheIet'Z
‘TH-Ill. lllll
3022 j 32)
W ‘@441
Patented Dec. 24, 1946
' ‘2,412,923’:
5, PATENT orrice
2,412,937 .
Edward A. Allen, West?cld, Mass., assignor to
Van Norman Company, Spring?eld, Mass., a
corporation of Massachusetts
Application June 30, 1944, Serial No. 542,900
2 Claims. (Cl. 77--58)
2 .
This invention relates to boring mechanism,
and particularly to improvements in suction
reception of the shank 2| of a tool bit 22. As
described in the 'Arp patent, the, tool is made
mechanism for removing chips as soon as they are
formed, so as to prevent them from falling
moved from the boring head by having attached
through the bored hole onto other parts of the
work piece and to maintain the surface of the
oored hole clean and free from metallic dust.
Prior proposals of this general nature have re
adjustable to a de?nite bore diameter while re
to it a screw threaded abutment 23 adapted to
contact an abutment 24 within the socket 211.
The hollow bore 25 extending through the shaft
14 is aligned with a hollow bore 25 within the
quired that the connections for supplying suction
boring head l8. The latter bore curves outward
be attached after the boring bar is secured in
out to the exterior of the tool head, preferably
place, and have also required that the suction
conduit be passed through the hole to be bored.
In accordance with the present invention the
ly at 21 abovethe tool socket 20, so that it opens
with a circular cross section. Into the latter part
of the bore ?ts a hollownozzle 30, conveniently
made of sheet material such as brass, and hav
use of a conduit passing through the bore is
ing a straight portion 3| of round cross section
eliminated, and the boring bar made a self-con 15 to ?t within the duct 21 and a hollow portion 32
tained structure which includes the suction con
which ?ts against a ?attened part of the outer
duit as a normally integral part.. A further'ob
surface of the boring head. The portion 32 of
ject of the‘ invention is to combine with a rotat
the nozzle is cut away at 33 on both its inner and
ing suction mechanism, having its suction aper
outer surface around the bit to provide a slight
ture closely adjacent the tool, a non-rotating
around the latter. A packing 34 is Prefer
guide mechanism with sliding contact blocks
ably arranged, around the tool bit so as to re
which follow the boring tool and guide it by en
strict the suction effect to the outside of noz
gagement with the freshly-cut surface of the bore.
zle 3ll.'
The invention will now be described in con
nection with the accompanying drawings, in 25 It has been found that as the chips leave the
bit they do not take a haphazard course but tend
to move relative to the bit in one or more rather
Fig. 1 is a side elevation illustrating the gen
well defined paths both in front of and behind
eral type of boring tool to which my invention '
the cutting point of the tool bit. With different
may be applied;
shapes and angles of cutting bits, as may be nec
Fig. 2 is a perspective view of the suction noz
essary for work of dl?ering characteristics, the
chip path may differ somewhat. A method will
Fig. 3 is a detail of a cutting headwith the '
suction nozzle in place;
therefore be described whereby the chip path
may be determined, as it has been found very de
sirable to have the outer aperture in the noz
zle limited as nearly as may be to that area nec
essary to pick up the chips and dust, the suc
The invention is shown as applied to a port
tion effect being enhanced with a limited open
able boring tool of the general type shown in the
ing in the nozzle. Too small an aperture, how'
Arp Patent 1,868,440.
ever, reduces its e?ectiveness since the chips tend
which may be anchored to the work piece it as
to jump the gap and escape the suction.
set forth in that patent. Sliding vertically in the
As a- preliminary check a blank nozzle, with its
base is a sleeve l2, suitablykeyed so as to pre
external aperture closely around the tool bit, may
vent its rotation. Suitably journaled in the sleeve,
be inserted in the boring head, coated on its pe
as by roller bearings not shown, is a hollow shaft
riphery with blueing, and the head used in a
it (Fig. 4) provided at its lower end with a ta»
short cutting operation. When the head is re
pered socket i5 terminating in a threaded section moved the nozzle will have the blueing removed
56. Within this socket ?ts the shank ll of a
along the paths taken by the chips. The nozzle
boring head it. The shank i1 is tapered to fit
is then cut away adjacent the tool bit in the chip
vthe socket and is threaded so that it may be
path and the operation repeated until the chips
screwed ?rmly in place. Below the maximum
no longer remove the blueing.
diameter of the tapered shank it is contracted
The cutter head It rotates within the sleeve I2
at l9 for a purpose to be described; and ?nally
on roller bearings 35 and carries the cutter 22
merges into the boring head i8, which is of sub
and the suction ‘nozzle 30 around with it. For
stantially the same diameter as the sleeve i2.
The boring head has a radial socket 20 for the 55 convenience in manufacturing the portion 4! of
Fig. 4 is a transverse section therethrough;'
Fig. 5 is a section on line 5-5 of Fig. 3.
the sleeve immediately surrounding the bearing
is shown made separate and attached to the main '
body of the sleeve by means not shown. Above
the cutter and the suction opening 21 are mount
ed a plurality of guide members 36 which pass
down the freshly cut bore and guide the boring
bar in its cutting operation as described in Arp
Patent 1,868,440 previously mentioned. These
members are adjustable by a spiral thread on a
rocable but non-rotatable guiding sleeve and a
shaft rotatably mounted within the sleeve and
reciprocable therewith, a cutter head having an
extension projecting upwardly and secured to
said shaft, a bearing between said upward ex
tension and the sleeve, a radially extending cut
ter bit located in the cutter head below said
bearing, said cutter head having a radial pas
sageway between the cutter bit and the bearing,v
scroll member 31 controllable in position from 10 said extension having an axial passageway con
necting with the radial passageway and the shaft
the top of the bar by a sleeve 38. It is very de
sirable that the chips be cleaned oil’ from the
having an axial passageway, and a suction hood
cylinder wall prior to contact or the guide mem
held within the radial passageway and having
bers 36 with the freshly cut surface. It is also
an aperture adjacent the tool bit.
desirable to avoid any necessity for connecting 15
2. In a boring bar or the type having a recip
the suction line to the lower end of the boring
her. since the adjustable feature of the tool bit
rocable but nonrotatable guiding sleeve and a
shaft rotatably mounted within the sleeve and
requires that it extend radially of the boring bar
reciprocable therewith, a cutter head having an
extension projecting upwardly and secured to
in such a manner as to block a direct connection
of a suction line axially of the boring bar. An 20 said shaft, a bearing between said upward exten
eccentric connection to the rotating head l8
sion and the sleeve, a radially extending cutter
would of course be extremely undesirable. By the
bit located in the cutter head below said bearing,
construction described, the suction may be ap
said cutter head having a radial passageway be
plied by a connection 39 to a ?exible hose 40
tween the cutter bit and the bearing, said exten
made at the top of the boring head. A further
sion having an axial passageway connecting with
advantage of locating the suction hose at this
the radial passageway and the shaft having an
point is that no special swivel connection need
axial passageway, and a suction hood held within
be made. it being sufficient only for a short length
the radial passageway and having a hollow cham
ber provided with opposed apertures permitting
of the connector 39 to pass into the upper end
' of the bore 25.
30 it to ?t over the tool bit and providing a suction
aperture adjacent the point 01' the tool bit.
I claim:
1. In a boring bar or the type having a recip
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