Improvements in Rotary Flue Cutters and the like.
Year: 1899

page_text: Date of Application, 12th Sept., 1899-Accepted, 2nd June, 1900
COMPLETE SPECIFICATION,
Improvements in Rotary Flue Cutters and the like.
I, BERNHARDT HENRIKSON, a Citizen of the United States of America, residing
at Austin, in the County of Cook and State of Illinois, Mechanical Engineer,
do hereby declare the nature of this invention and in what manner the same is
to be performed, to be particularly described and ascertained in and by the
following statement :-
My invention relates to that class of instruments in which a rotary tool-stock
or spindle, adapted to have its end inserted in the end of the flue, is provided
with an outwardly movable cutting-disk adapted to be forced outwardly against
the inner surface of the flue as the tool is turned and thereby cut a circum.
ferential groove upon the inner surface of the flue, until it cuts entirely through
the latter; and my invention has for its object the provision of a novel and
more efficient instrument of this class, in which the tool is rotated and the
cutting-disk automatically forced outward to sever the flue by the action of the
compressed air or other motive fluid employed to operate the tool, all as herein-
after more fully explained in connection with the accompanying drawings, in
which Figure 1 is a perspective view of the end of a locomotive boiler, showing
the tube-sheet having the front ends of the flues secured in it, and my novel
flue-cutter in position to sever one of the flues behind the tube-sheet, and
Figure 2 a middle longitudinal section of the flue-cutter proper.
The same letters of reference are used to designate identical parts in the
views.
Any suitable motor A, operated by compressed air or other motive fluid led
to it through a flexible supply-pipe B, is employed to rotate my new tool. This
motor may be connected directly to the tool, or, as illustrated, the connection
may be by means of a tube C of suitable length for convenience in handling
the tool. My novel tool, indicated by the letter D in Figure 1 and shown in
section in Figure 2, is connected either directly to the rotary spindle of the
motor A, or to the front end of the tube C, whose rear end in such event is
connected to the motor spindle, and the motive fluid led to the tool through
the tube C for the purpose hereafter explained, it being understood that when
motive fluid is turned on to the motor A it also passes to the tool D, either
directly or through the tube C.
The rear half or portion of what I will term the tool-stock or spindle of my
new tool is composed of a tube E, closed at its forward end and there connected
integrally with a forward extension F in which is fulcrumed the lever G which
carries at its forward end the cutting disk H. The rear end of the lever G is
provided upon its outer edge with a cam-surface I with which co-operates a
roller J mounted in a suitable recess formed to receive it in the front end of a
cylindrical shell J' formed upon and projecting forwardly from the forward
side of a piston K which fits and travels in an open-ended cylinder L provided
upon its alosed rear side with a hub M fitting upon the tube E and secured
thereto by a pointed set-screw N. The particular construction of the piston K,
as a piston, is not essential and that illustrated need not be described in detail.

page_text: The tube E is provided near its front end with an integral flange or collar O
forming an annular shoulder against which bears the front end of a coiled
spring surrounding the tube E and confined (within the cylindrical
shell between said collar and the forward side of the piston K,
said spring serving to press the piston K rearward and yieldingly
hold it in and return it to its normal position shown in Figure 2. The tube E
is provided with a port Q just within the rear end of the cylinder L, through
which motive fluid is admitted from the tube E to the cylinder L, behind the
piston K, whenever motive fluid is turned on to the motor A, Figure 1, it being
understood that the tube E is in connection at such time with the motive fluid
supply, either directly through the motor or through the tube C interposed
between the motor and the tool proper.
The forward extension F of the tool stock is provided toward its front end
with an outwardly projecting flange or collar R forming an annular shoulder
which abuts against the end of the flue or surface of the tube-sheet and limits
the insertion of the front end of the tool into the flue. Screwed into the extreme
front end of said forward extension is a short stub-spindle S having a flange or
collar seating in a recess formed in the part F to receive it, and, having a
reduced portion beyond the end of the part F provided with a circumferential
groove bin which fits a circle of anti-friction balls e upon which turns a bearing
ring T of slightly larger diameter than the exterior of the front end of the
part F. This ring is held in place upon the spindle $ by a nut U screwed upon
the reduced front end of the spindle S and abutting at its rear side against the
slightly larger middle portion of said spindle containing the groove b, the
bearing ring T being thus confined between the nut U and front end of the
part but left free to turn upon the balls c.
The front end of the lever G is formed into a yoke G¹ in the space between
whose two arms is located the rotary cutting-disk H which is mounted upon
an arbor formed by a screw passed through the outer arm of the yoke and at
its inner end screwed into the body of the lever G. A coiled spring V is inter-
posed around said screw between the forward side of the disk H and the
adjacent arm of the yoke G¹ of the lever G, for a purpose hereafter explained.
A spring W secured at its front end in the bottom of the recess in the
extension F in which fits and plays the lever G bears at its rear end against
the under edge of the rear end of said lever and presses the latter outwardly and
yieldingly holds it in and serves in return it to its normal position shown in
Figure 2.
Under the construction and arrangement of the parts above described the
operation of my new flue-cutter is as follows, assuming it to be connected with
a suitable motor as in Figure 1: the front end of the tool is inserted in the
end of the flue which is to be cut off until the flange R abuts against the end of
the flue or surface of the tube-sheet, as indicated in Figure 1. The motive
fluid is turned on to the motor causing the latter to rotate the tool, and passes
at the same time through the tube E and port Q to the cylinder L, behind the
piston K, thereby pressing the latter forward and causing the roller bearing
upon the cam-surface I of the lever G to press the rear end of the latter inward
toward the axis of the tool and force its front end outward, thereby bringing
the cutting-edge of the disk H into contact with the interior surface of the flue.
The tool continues to rapidly rotate, with the cutter H pressed firmly into contact
with the inner surface of the flue, the piston K moving forward, under the
pressure of the motive fluid behind it, and forcing the rear end of the lever G
inward as the cutter H gradually cuts a circumferential groove in the interior
of the flue and finally severs the latter. Upon then cutting off the supply of
motive fluid from the motor the motive fluid which has forced the piston K
forward will escape backward through the tube E and exhaust outlet of the
motor and permit the spring W to force the rear end of the lever G oniward
again and retract its forward end, thereby disengaging the cutter from the flue

page_text: and permitting the withdrawal of the tool from the flue and its insertion in,
another flue.
The purpose of the coiled spring V before referred to is to compensate for
the outward movement of the front end of the lever G in the arc of a circle,
while the cutter H (after its first engagement with the inner surface of the flue)
moves radially outward in a straight line. The provision for such limited play
of the cutting disk H permits this relative movement of the lever and disk
while the spring V serves to yieldingly hold the disk in and return it to normal
position.
As will be understood from the foregoing description, I have produced a
novel instrument of this character operated entirely by the motive fluid, both
in respect to rotation of the entire tool and in respect to the outward movement
of the cutting-disk, and that the cutting disk is automatically forced outward
by the action of the motive fluid and is firmly but yieldingly pressed outward
thereby during the continued operation of the tool until the flue has been
severed, owing to which fact the tool is much more efficient and expeditious
in operation than any tool of this character with which I have heretofore been
familiar.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:--
1. A tool of the character described, comprising a rotary tool-stock or holder,
an outwardly movable cutter carried thereby, and means adapted to be operated
by motive fluid to force said cutter outward as the tool is rotated.
2. A tool of the character described, comprising a rotary tool-stock or holder,
an outwardly movable cutter carried thereby, a cylinder mounted upon said
tool-stock, a piston in said cylinder, and means intermediate the piston and
cutter for forcing the latter outward when the piston is moved by the admission
of motive fluid to the cylinder.
3. A tool of the character described, comprising a rotary tool-stock or holder,
an outwardly movable cutter carried thereby, a cylinder mounted upon said
tool-stock, a piston therein movable in one direction by the admission of motive
fluid behind it and in the opposite direction by a resetting spring, and means
intermediate said piston and cutter for forcing the latter outward when the
piston is advanced by the admission of motive fluid to the cylinder.
4. A tool of the character described, comprising a rotary tool-stock or holder.
a lever fulcrumed therein, a rotary cutting-disk carried by the front end of said
lever, a cylinder mounted upon said tool-stock, and a piston in said cylinder
co-operating with the rear end of said lever and adapted when advanced by
the admission of motive fluid behind it to force the rear end of the lever inward
and its forward end and the cutting disk outward.
5. A tool of the character described, comprising a rotary tool-stock or holder,
a lever fulcrumed therein and provided with a cam-surface at its rear end, a
cutting disk carried by the front end of said lever, a cylinder mounted upon
the tool-stock, a piston therein having a hollow rod or cylindrical extension
co-operating with the cam-surface upon the lever, and a resetting spring for
the piston coiled around the tool-stock within such cylindrical extension.
6. A tool of the character described, comprising a rotary tool-stock or holder,
an outwardly movable cutter carried thereby, an anti-friction bearing ring
mounted upon said tool-stock in advance of the cutter, a cylinder mounted upon
the tool-stock in rear of the cutter, a piston in said cylinder, and means inter-
mediate said piston and cutter for forcing the latter outward when the piston is
advanced by the admission of motive fluid behind it.
7. A tool of the character described, comprising a rotary tool-stock or holder,
an anti-friction bearing ring mounted upon its front end, a lever fulcrumed in
said tool-stock, a cutting disk carried by the front end of said lever, a cylinder

page_text: mounted upon the tool-stock in rear of the lever, and a piston in said cylinder
co-operating with the rear end of the lever to force the latter inward and its
front end and the cutter outward when the piston is advanced by the admission
of motive fluid behind it.
8. The combination of a rotary tool-stock or holder, a lever fulerumed therein,
a cylinder mounted upon the tool-stock, and a piston in said cylinder co-operating
with the lever to force one end of the same outward when the piston is advanced
by the admission of motive fluid behind it.
9. The combination of a rotary tool-stock or holder a lever fulcrumed therein,
a cylinder mounted upon said tool-stock, and a piston in said cylinder co-operating
with one end of said lever to force the opposite end thereof outward when the
piston is advanced by the admission of motive fluid behind it.
10. The combination of a rotary tool-stock or holder, a lever fulcrumed
therein, a cylinder mounted upon said tool-stock, and a piston therein co-
operating with the rear end of the lever to force the latter inward and the
front end of the lever outward when the piston is advanced by the admission
of motive fluid behind it.
11. The combination of the tool-stock or holder E F, the lever G fulcrumed
therein, the cylinder L mounted thereon, and the piston K moving in the
cylinder L and co-operating with the lever G.
12. The combination of the tool-stock E F, the lever G fulcrumed therein
and provided with the cam-surface I at its rear end, the cylinder L mounted
upon the tool-stock, and the piston K moving in the cylinder and having the
extension J carrying the roller J and co-operating with the cam-surface I of the
lever G.
13. The combination of the tool-stock E F, the lever G fulcrumed therein and
provided with the cam-surface I at its rear end, the cylinder L mounted upon
the tool-stock, the piston K moving therein and provided with the cylindrical
extension J carrying the roller J co-operating with the cam-surface I of the
lever G, and the coiled resetting spring P' surrounding the tool-stock within
the cylindrical extension J' of the piston.
14. The combination of the tool-stock E F, the lever G fulcrumed thereir,
the cutting disk H carried by the front end of said lever and having limited
play longitudinally of its own axis, the spring V pressing the disk H in one
direction but permitting its movement in the opposite direction, and means for
forcing the rear end of the lever G inward and its front end outward while the
tool-stock is rotated.
15. The combination of the tool-stock E F, the lever G fulcrumed therein
and having its front end formed into the yoke G', the rotary cutting-disk H
mounted in said yoke, and means for forcing the rear end of the lever in ward
and its front end outward while the tool-stock is rotated.
16. The combination of the tool-stock E F, the lever G fulcrumed therein
and having its front end formed into the yoke G¹, the rotary cutting-disk H
mounted in said yoke, the spring V confined in said yoke at one side of said
disk, and means for forcing the rear end of the lever G'inward and its front end
outward while the tool-stock is rotated.
17. The combination of the tool-stock, the outwardly movable cutter carried
thereby, and the anti-friction bearing ring T mounted upon the anti-friction
balls cat the front end of the tool-stock.
18. The combination of the tool-stock, the outwardly movable cutter carried
thereby, the stub-spindle S screwed into the front end of the tool-stock and
provided with the circumferential groove b, the anti-friction balls "e seated in
said groove, the bearing-ring T turning on said balls, and the confining nut U.
19. The combination of the tool-stock, the lever G fulcrumed therein, the
rotary cutting-disk H carried by the front end of said lever, and the anti-friction
bearing ring T mounted upon the tool-stock in advance of the cutter.
20. The combination of the tool-stock E F, the lever G fulcrumed therein

page_text: and having the cam-surface I at its rear end, the rotary cutting-disk H carried
by the front end of said lever, the cylinder L mounted upon the tool-stock,
the piston K therein having the cylindrical extension J carrying the roller J
co-operating with the cam-surface I of the lever G, and the coiled resetting
spring for the piston surrounding the tool-stock within the cylindrical exten-
sion of the piston.
21. The combination of the tool-stock, the lever G fulcrumed therein and
provided at its rear end with the cam-surface I and having its front end formed
into the yoke G1, the rotary cutting-disk H mounted in said yoke, the spring V
confined in said yoke at one side of said disk, the cylinder L mounted upon the
tool-stock, the piston K therein having the cylindrical extension J' carrying the
roller J co-operating with the cam-surface 1 of the lever G, and the resetting
springs and W for the piston K and lever G, respectively.
22. A rotary flue-cutter having an outwardly movable cutting-disk and means
operated by motive fluid for forcing said disk outward as the tool is rotated.
23. A rotary flue-cutter having an outwardly movable cutting-disk, in com-
bination with a motor for rotating the tool and with means for forcing the
cutter outward, both operated by the motive fluid, whereby upon admitting
motive fluid the tool is rotated and the cutter automatically forced outward to
sever the flue.
24. A rotary flue-cutter having an outwardly movable cutting-disk and means
adapted to be operated by motive fluid to force said cutting disk outward, in
combination with a motor for rotating said teol and a driving connection
between said motor and tool having a passage for conveying motive fluid to
the tool, for the purpose described.
25. The combination of the motor A and the rotary flue-cutting tool 1) con-
nected thereto by the tube C and having the outwardly movable cutting disk
and means operated by the motive fluid admitted to the tool through the tube C
for forcing the cutting-disk outward to sever the flue as the tool is rotated.
Dated 100
1
CACHUC
EQTRYBY
LUPRA
MARKS & CLERK,
18, Southampton Buildings, London, W.C.,
13, Temple Street, Birmingham, and
25, Cross Street, Manchester,
Agents.
MARKS & CLERK,
18, Southampton Buildings, London, W.C.,
13, Temple Street, Birmingham, and
25, Cross Street, Manchester,
Agents.