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Патент USA US2409777

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Oct. 22, 1946.
J, A, MAPLES - ’
2,409,776
JIG FOR TRIMMING BOILER TUBES
Filed 001;. 18,‘ 1943
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INVENTOR.
Jakrzd?fapéai
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-BY
Patented Oct. 22, 1946
» 2,409,776
ounce STAT ES 1 PATENT ~ omce
2,409,776 ,
no Foe TBIMMING‘ some roses
John A. Maples, Sturgeon Bay,‘ Wis., assignor to
Leathem D. Smith Shipbuilding ,‘Co., sturgeon‘
~ Bay, Wis, a corporation of'Wis'consin
Application October is, 1943?, Serial No. 506,715
‘
1
3 Claims.
(01.299105)
,
2,
vFig. 3 is a transverse sectional view taken in a
The present invention relates to jigs or similar
device for ‘machining, as trimming or cutting, the
‘ena- of boiler tubes after they have been inserted
th‘roughfa boiler sheet or plate, and before the
rolling or spinning of the ends of the tubes against
theboiler sheet or plate.
planerepr'esented by line 3-3 in Fig. l or ‘the
drawing;
'
‘
,
'
Fig. 4 is a longitudinal sectional view of the
tool and a part of the tube and boiler plate at a
starting stage of operation; and,
'
I Fig. 5 is a similar View showing the ?nal ‘stage
When tubing a boiler, the tubes are inserted
of‘ operation.
hrough the holes in the boiler sheet or plate
Referring more in detail to the drawing the
with ‘an end portion of the tubes extending or
particular
embodiment chosen to illustrate the
10
projecting beyond the surface of the plate. The
invention is shown as comprising a cylindrical
protruding end portions will vary in length and
body or chuck I having at an end thereof an
will'be ‘more ‘or less irregular or rough. vIt is de
axially extending rigid shank 2 provided with a
sirable ‘and essential ‘that such protruding end
coupling
portion 3 which may be squared, ?uted,
portions ‘of the tubes all be alike, that is, all of
or the like, for coupling to a portable driving
equal ‘length, and also ‘that the ends‘of the tubes
unit ‘(not shown) such as an air motor or an elec
be 'eVen and square, that is, at right angles to
the axes‘of the tubes.
‘
tric motor, or'the like, an example of‘su’ch a motor
being that usually used for portable drills ‘and
the like. At the other end the chuck I has an
‘
ng the ‘objects of the invention is to pro
vide a ‘novel tool or jig for machining or trimming
20
the protruding end portions of boiler tubes in a
boiler ‘sheet or plate ‘to ’a de?nite and predeter
mined length, and to a properly and desired ?n
ished end form, for the later efficient rounding
or ‘spinning of thejen‘d portions of the tubes. ‘It
axially extending rigid spindle or arbor 4 having
a ‘cylindrical body portion 5 adapted to fit and
slide ‘in an end portion of the boiler tube 1 ‘so
as to‘ guidethe jig or tool axially with respect
to;the tube 1, thespindle or arbor 4 also having
comprises‘a‘chuck for holding‘ cutters for’ cutting 25 a‘ftapered endportion S for affording a facile
entrylof the spindle or arbor 4 into the ‘end of
or ‘trimming the “ends of the tubes, ‘the cutters
the tube 1 when applying the tool or jig in place
being adjustable ‘in the chuck and adjustably set
for-trimming the end of the tube 1.
in‘adjusted‘positionfor the desired ?nished length
The body or‘ chuck i also has a plurality of
of the ‘protruding end portions of the tubes ‘be
axially extending cutter sockets 8, arranged con
yond the boiler ‘sheet or plate. It also preferably
centric with theaxis of the tool or jig, for ‘recep
has a'gauge stop "with ‘reference to which the'
tion of cutters 9, these cutters being shown as
cutters are “initially adjusted as desired, and
square or rectangular ‘in cross section and being
which, when the cutting‘ operation progresses, will
provided at their forward ends with bevels ‘H3
contact or abut ‘the boiler plate‘or sheet and thus
automatically stop jfurther cutting or trimming 35 running to. cutting edges ll. The cutt’ers 9 are
held “in- place by suitable setscrews l2, such as
o‘i'the ‘end portion of the tube and thus determine
the ‘type known as the Allen setscrews, having
thedesired length "of ‘the protruding end portion
of the tube.
,_
‘
‘
I
,
wrench sockets ‘l3 I(see Fig. 1), these setscrews
being‘threaded into suitable radially extending
_
A ‘further object of the invention is to provide
a novel ‘jig of the character'described and, which
has'a ‘guiding arbor or spindle ?tting into the tube
to be out, which arbor maintains the jig coaxial
40
threaded bores l4 provided in the sides of the
chuck l and extending to the cutter sockets ‘8, so
that the setscrews may bind against the sides‘ of
r the cutters 9 and hold them in adjusted and se
with the tube and the cutters square so that the
lected position.
end of the tube will be cut square or at a right
At the forward end of the chuck l is provided a
45
angle to the axis of the tube.
?ange i5 which acts as a gauge stop when it
Also, the invention comprises the provision of
contacts the boiler plate or sheet l6 (see Fig. 5)
a novel means provided with openings adjacent
so as to stop the cutting or the trimming of the
the cutting locus for affording a free and direct
end I‘! of the boiler tube 1 (see Fig. 5) at the
escape of the chips or trimmings or cuttings to
the exterior of the jig during the operation there 50 gauged distance, for the later rolling or spinning
of the end ll of the tube 1.
of.
'
As the tool is rotated or turned about its axis
Other objects, capabilities, advantages, fea
the cutting edges ll of the cutters 9 will cut
tures, and the like, are comprehended by the in
chips or shavings or cuttings or the like from the
vention as will later appear and as are inher
end of the tube ‘I, and for the purpose of afford
ently possessed bythe invention.
ing a free escape of these cuttings the ?ange
Referring brie?y to the drawing:
Fig. 1 is a side View of a jig constructed in
accordance with the invention;
Fig. 2 is an end view taken from a plane rep’
resented by line 2-4 in, Fig. 1 of the drawing;
portion 15 is provided withradially extending
escape passages 18 communicating with the an
nular space I9 between the arbor l4 and the
‘flange l5 and at or adjacent the cutting ends of >
2,409,776
3
the cutters 9 and with the exterior of the flange
I5, so that the cuttings will be free to move
through the escape passages l8 directly from the
cutting loci to the exterior of the chuck I. The
inner ends 20 of the passages l8 intersect the
forward end of the chuck l adjacent to the cutter
sockets 8 and at the inner or rear end of the
annular chamber I9 where the forward ends of
the cutter sockets 8 terminate.
,
4
drawing shown an illustrated embodiment of
the invention it is to be understood that the in
vention is not limited thereto but comprehends
other constructions, details, arrangements of
parts, features, and the like, without departing
from the spirit of the invention.
Having thus disclosed the invention, I claim:
1. A jig for trimming the end of a boiler tube
projecting through a boiler plate comprising a
In use the cutters 9 are ?rst adjusted in the 10
cylindrical casting having upper and lower end
chuck I so that the cutting edges II will be at a
faces
and having a coaxial arbor extending from
given or predetermined distance from the for
the lower end face, said arbor having a sub
ward end of the gauge stop I5. This distance
stantially smaller diameter than the lower face
will be equal to the desired length of the end I‘!
of the tube 1 (see Fig 5) beyond the boiler plate 15 and a slightly smaller diameter than the inside
diameter of the boiler tube to be trimmed, an
I6 when the end of the tube has been cut or
annular recess in the lower, end face adjacent
trimmed to the point when the gauge stop l5
the arbor resultantly forming a downwardly
contacts the boiler plate [6. The setscrews 12
directed annular ?ange therearound, a socket
are then set against the cutters 9.
In operation the jig is coupled to a suitable 20 in the casting parallel with the jig axis and
opening into the recess, and a cutter adjustably
driving motor, and, being portable, the arbor 4
mounted in said socket.
is introduced into the protruding end ll of a
2. A jig for trimming the end of a boiler tube
boiler tube 1, as shown in Fig. 4. The cutters 9
projecting through a boiler plate comprising a
are thus in contact with the end I’! of the boiler
cylindrical casting having upper and lower end
tube 1 as shown in Fig. 4. The cutting edges ll
25 faces and having a coaxial arbor extending from
of the cutters 9 are maintained at a normal,
the lower end face, said arbor having a sub
that is, at right angles, to the tube 1 by reason
stantially smaller diameter than the lower face
of the cylindrical portion 5 of the arbor ?tting
and a slightly smaller diameter than the inside
closely in the tube 1 and being coaxial therewith.
diameter of the boiler tube to be trimmed, an
The operator presses the tool forwardly against
the end of the tube 7, and closes the circuit of 30 annular recess in the lower end face adjacent
the arbor resultantly forming a downwardly
the driving motor, so that the tool is caused to
directed annular ?ange therearound, a socket in
revolve about the axis of the tool and of the tube
the casting parallel with the axis of the jig and
1 to trim or cut off chips or like cuttings from the
opening into said recess, a cutter mounted in
end of the tube 1. When the tool has pro
gressed in its cutting or trimming operation to 35 said socket so that its cutting edge is inside the
recess, and an opening through the Wall of the
the point when the gauge stop l5 contacts or
casting into the recess adjacent the cutting edge
abuts against the boiler sheet or plate It, further
of the cutter.
cutting of the tube is prevented, even though the
3. A jig for trimming the end of a boiler tube
tool may continue to rotate. The cut end of the 40
projecting through a boiler plate comprising a
tube 1 is square, that is, at right angles to the
cylindrical casting having upper and lower end
axis of the tube 7, and the length of the tube
faces and having a coaxial arbor extending from
end I‘! is that of the desired and given magni
the lower end face, said arbor having a sub
tude for a proper later rolling or spinning of the
stantially smaller diameter than the lower face
tube end i’! against the boiler sheet or plate l6.
and a slightly smaller diameter than the inside
By the present invention, after the cutters 5
.diameter of the boiler tube to be trimmed, an
have been initially set for a given distance, as
annular recess in the lower end face adjacent
explained above, the amount of stock left at the
the arbor resultantly forming a downwardly
end of the tube 1, beyond the plate I6, is con
trolled automatically. With this device it has 50 directed annular ?ange therearound, a plurality
of passageways in said casting parallel to the axis
been found that when tubing a boiler having
of the jig and extending from the upper end face
approximately 1600 tubes, there is a saving of
through to the recess, elongated cutters disposed
about Soil man hours of labor, over the work and
in said passageways with the cutting edges in the
time required by other existing and known
annular recess, means for holding each cutter
operations. Also, the tool automatically clears
itself of the, chips and the other cuttings or -, against axial movement, and openings through
the casting into the recess adjacent each cutting
trimmings as fast as they are produced.
edge whereby chips may escape from the recess.
While I have herein described and upon the
JOHN A. MAPLES.
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