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Патент USA US2405467

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Aug. 6, 1946.
2,4054e37 ‚
Filed Jan. 28, 1943
7 Sheets-Sheet l
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Äug._ 6, 1946.
Filed Jan. 28, 1943
7 Sheets-Sheet 2
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_Filed Jan. 128, 19.43
‚7 Sheets-Shee’c 4
Äug‚ ß, 1946,
Filed Jan.‘ 28/, 1943
7 Sheets-Sheet 5
Aug. 6, 1946.‘
Filed Jan. 28. 1943
7 Sheefcs-Sheet 6
Aug. 6, 1946.
Filed Jan. 28, 1943
7 Sheets-Sheet 7_
42 .2?
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Patenten! Aug. 6, 1946
Henry H. Talboys, Milwaukee, Wis., ass‚ignor_to
Nordberg Manufacturing Company, Milwaukee,
Wi’s., a corporation of Wisconsjn
Application Januar); 28, 1943, Serial N0. 473,811
20 Cla-ims. (C1. 51—34)
Th1s invention relates 110 an improvement; in
Figure 9 is a section along the line €!——9 of
internal grinders anal polishers anc1 polishing
Figure 3;
methods and has for one purpose the provision
of an internal grinder e?’ective to ?nish cy1in
drical inner surfaces.
Figure 10;
One application of the invention is to polish
the interior surface of tubes; pipes anti the like.
Another purpose i-s the» provision of an im
proved means and method for truing up inner
Figure 12 is a, section along the 1ine I 2--I2 of
Figure 10 ;
Figure 13 is a sid_eelevation of ‘a grinding seg
generally cylindrieal surfaces, smoothing the 10
surfaces, grinding down a.ny inequalities and in
general ?nishing the surfaces to form a, substan
tially true cylinder.
Figure 10 is a plan view of the grinding head;
Figure 11 is a section a10ng the line II—-.—I Lot
Figure 14 is a, plan view of a grinding segment
Figure 15 is a section on an enlarged scalaalong
the 1ine I5——I 5 of Figure 1;
Another purpose is the provision of an im
Figures 16, 17 and 18 ~ illustrat_e details of a
proved interior grinding means including a._ power 15 slight variation from the corresponding struc
plant and a grinding element 01‘ elements Which
tures shown in Figures 3, 6 and- 9 respectively.
may be bodily conveyed as a_ unit axially along
Lilie parts are indicated by 1ike charactel‘s
the member to be polished.
throughout the speci?cation and„ draw-ings.
Another purpose is the provision cf improved
Referring to I;he drawings and initially pri
means f0r guiding and supporting such unit.
20 marily. tq»Figure 1, I is any suitable supporting
Another purpose of the invention is I;he pro?
surface, ?oor or the 1ike. The structura supporh.
sion of improved means f01‘ adjusting the thrust
ed on the surface includes generally the fo1low
01° the grinding means against an inner surface.
?ng elements: A generally indicates a aupport»
Another purpose of the invention is the pro
ing structure f0r the feeding means for the power
vision of improved means for disposing of dust 25 anal grinder unit below described; B indicates a
created by the o1‘ ?nishing operation.
supporting device-for the motor and grinding unit
Another purpose is the provision of improved
when not in use; C indicates generally, support
feeding means and feed limiting meang for such
ing meansfor the tube or other element, the in
a device.
terior of which is to be ‚grouncL ?nished, or pol
Another purpose is the provision 015 an im 30 ished.
provad head or element.
Referring ?rst to the structure indicated as -A‚
Another purpose is the provision of an im
it may be formed in a wide variety of Ways but:
proved means for adjusting the centrifuga]
I illustrate a plurality. of uprights 2 connected
thrust of a rota‚ry grinding element.
by longitudinally extendir;g angles 3. The angles
Other purposes will appear from time 130 time 35 or the uprights or both may be connected by
throughout the speci?cation and claims.
transversely extended angles 4. Mounted on the
My invention 15 illustrated more o1‘ lass di
transverse membem ß and shown in some detail
agrammatically in the accompanying drawings,
in Figures 3, 4 ancl 5, arg a pair cf 10ngitudinally
eXtendingangles 5‚„the lowe_r ?_anges o-f which
Figure 1 is a side eleva‚tion with parts in ver
tical section;
Figure 2 is a section on an enlarged scale along
the line 2-2 of Figure 1;
Figure 3 is a, partial vertical longitudinal sec
tion on the same scale as Figure 2;
Flgure ‘1 i‘s a section along the 1ine l5—-4 of
Figure 3;
Figure 5 is a section along the line 5—-5 01f
F‘igure 3;
Figure 6 15 a section along the 1ine 5—8 of
Figure 3;
Figure 7 is a partialplan view of the carrier
for the motor unit;
Figure 8 15 a- section along the» 1ine 8-8 of
Figul‘e '7;
44 approach and are divided by a space asat 6.
Slidable in the channel thus provided by the
angles ‘3 i‘s a.ny suitable transversely extending
thrust member 1, herein shown as- a hollow ele
ment of recta‚ngular cr0ss section. II: is provid.
' ed with a downwardly. extencled rack 8, which
rides in and iS guicled longitudinally by.the ap
erture 6. 9»indicates a transverse pin Which may
be employed as a stop. If desired‚ a plurality of
apertures 9a may be provided f0r permitting ad
justment of the_styop‚ if such adjustment is neo
essary. The rack is driven by-any suitable pin
i_on I0, mounted. on a shaft II, in any suita.ble
bearings I2. The shaft I I ma‚y»carry a sprocket
I3, about whichpasses a chain _or belt I4, ‘which
55 in turn passes about a sprocket I5, driv‚en by a
friction drive Hi. i‘! is any suitable gear re
ducer and I8 any suitable source of power such
as an electric motor.
II: will be understood tha'o the detailg do not
form part of the present invention and What is
necessary is sonne means for driving the pinion
work along the entire length of the work in re
sponse to the rotation of the pinion I0 and back
‘ through the work in the opposite direction and
into the shell 25. In order to support the motor
anal grinder unit du1‘ing this excursion, I provide
a supporting frame including three longitudinaliy
extending frame elements 31 ‚ 32, and 33. 'I‘he
three frame elements are connected by two or
more circumferential ring elements 34. The lon
ever, that Whei‘e a series of successive passes is
made in order 130 treat an article of a given 10 gitudinal elements 3I and 32 may be ?xed to the
rings 34 by welding o1‘ otherwise. Preferably one
1ength, where lt is desired to have ‘alle passes ex
cf thg longitudinal elements herein shown as 33
tend through a. uniform distance at each pass, it
is mounten movably radially in relation to the
may he advantageous to provide any suitahle
rings 34 and yielding means are provided for
automatic reversing means for reversing the drive.
thrusting it radially outward toward the inner
at the end of the pass. Since such meansars
surface of the shell 25 01‘ the work D. I illustrate,
well known‚ they need not‚ -be indicated in detail.
for example‚ guiding pins 35 surrounded by com
20 illustrates any suitable rolle?!‘ means for hold
pressed spring 36. The guiding pins are C011
ing the rack 8 down against the pinion H. 2I is
I9 anal thereby moving the rack 8 alternately in
opposite directions. It Will be understood, 110W
nected to the element 33, for example by angles
a stop plate mounted acljacent; the right end of
the unit A. Referring 110 the positiou of the parts 20 31, and nass through ?xed abutments 38 on the
rings 34. Axial movement of the member 33 is
shown in Figure 1, the stop plate 21 may be en
prevented for exarnple by any suitable stops or
gaged by the pin 9 ab the end of the stroke in one
bars 38, whichywith the angles 31 act as‚ move
ment limiting means. In order to space the rings
sponding pin ab thaend of the opposite strok_e in
another direction. I illustrate, for example, the 25 34 axially apart, I also provide br&ces 40 located
adjacent the member 33 and provide the sti?en
pivoted links 22 carrying a stop member 23 at
direction or it may be engaged by some corre
ing which 33 cannot give because of its movable
their end. In the position in which the parts are
relationship With the rings.
shown in Figure 2, it stops the grinding element;
Any s_uitable means may beemployed for sup
in the pos'ition in which ii; is shown in Figure 3‚
the grinding elemen’c is approximately inside, the 30 porting the above described structure Within the
work. If the links 22 are rotated into their oppo
si’se position, then the stop 23 will not be effective
unti1 after the grinding element has been entirely
withdrawn from the work. 'I‘he friction connec
inner faces of the member 25 and the ‚work B re
spectively. I show for example, wheels or rollers
4 I. The member 3I is shown in Figure 3 as carry
ing four of these rollers. In the stru_ctu'n; shown
tion I6 permits slippage when any of the stops en 35 in Figures 3, 6 and 9, these bottom rollers, mount
ed on 3l, penetrate the slot 30 of the ele’ments 29,
gage the‘plate 2l. This protects the motor from
anti thus prevent rotation of the frame formea by
burning mit.
the elements 3I, 32 and 33 and the rings 34. I also
Controlled 0r moved by the element 7 and its
illustrate rollers 4I at each end of_the members
rack 8, in response to the rotation of the pinion
II), is the motor and grinding unit below de 40 32 and 33, these rollers abutting against the in
ner surface of the members 25 and D. I1; will be
scribed. The motor and grinder uniiz, when not in
observed as in Figure 3_. that the cut-away por
use, is housed in a supporting and aligning‘ Shell
t1ons 21 are out 0f line with the paths of these
25 which forms part of ’che structure B indicated
in Figure l. This Shell may be supported in any
In ’che form of Figures 16, 17 al‘ld 18, the lower
suitable manner on a plurality of uprights 26; vIt
rollers 41a are mounted on the element 3l, lat
is also, provided with a plurality of cut-outs or
erally out of line with the sich 39 of the element
open spaces 21, which permit inspection of the
29. Thus all of-the sets of rollerg as shown in
motor and grinder unit and gives access to the
Figures 16, 17 and 18‚ engage the inner faoe 01t‘ the
motor and grinder when housed in the Shell 25
anal also permits inspection todetermine proper . work or of the member 25 and are not relied upon
for preventing rotation of the structure. I pro
alignment between the grinder unit and the work
supported on the element C. 28 are any suitable
circumferential reinforcing rings. ‘I'he shel1 is
provided with a bottom piece 29, havi_ng a lonsi—
tudinally extending slot 30. ‘I‘he shell terminates
a1: its right band end, referring to the position cf
the parts shown in Figure 3, in a plane perpen
dicular 130 the axis of the Shell, which permits a
close approach of the opposed edge of ‘ehe work
v1de instead a feather or key 133, mounted in any
suitable manner on the member 3I, and adapted
to penetrate the slot 33. This penetration pre
yents any rotation of the motor and its support
mg carrier and has the additional advantage of
tending to scour out dust, and shavings from the
slot. Ir, 15 thought to be advantageous to have
the rollers directly engage ‘ehe cylindrical inner
(in surfaces. An accumulation of chips anal dusb in
inclicated as D.
the s1ot may be disadvantageous, and may cause
It will be understood that the interna1 diame—
irregularities in grinding, unless scrapers or an
ter of the shell 25 is substantially the same as
air j et are employed to keep the slot c1ear. This
the intern2l diameter of the work D and also that
is unnecessary in the structures of Figures 16 to
some means are preferably provided in connec
tion with the W01‘k D for continuing the slot 30 65 18. Ii, will also be understood that- if the work
is not itself provided with a slot, Other means
or its equivalent. As an example, the whole de
may be provicigd to prevent rotation of the body
vice may be employed in ?nishing the interior of a.
0f the motor anal support, such 215 a rigid shaft
tubular element formed by rolling a sheei; of meta1
centered on the motor.
together so that the opposite longitudinally ex
tending edges of the sheet approach but do not 70 Mounted within the frame thlls formed and
supported by the rings 34, I illustrate any suit
meet. The space between the approaching edges
abl<z’motor 42, one end of whioh is sea’ced in the
provides an aperture aligned with and corre
right i‘ing 34, referrlng to Figure 3‚ the other
sponding to the_slot 33. It will be understood fahat
being engaged anal held in position by any suit
the below described motor and grinding uni1; may
be moved freely out of the shel1 25 and into the 75 ab1e clamp plate 43. Any suitable means may be
empbyed for cooling the.motor. For example, a
piece 81 With ‘a s10t:82 in alignment with the.cor—
responding members 29 and 30 0f the shell 25 as
shown in Figure 9. 83 inclicates any suitable
semicircular clamps which may be clamped down
sup’plemental fan 44 or under some circumstances,
the device may be coupled into any suitable suc
tion system. Under general circumstances, it is
advantageous to employ the integral fan 4‘4, as 5 in any suitable manner as by bo1ts 84. The struc
ture-thus provided permits the ?rm locking (‚f the
shown in Figure 3, operated by the same motor
workbetween the clamps 80 anal 83 Withthe op
which rotates the grinding head structure. I il
posite edges of the work cylinder D abutting
lustrate for example in Figure 1, the suction duct
against the upwardly extended longitudinal
45 in communication with the housing 45 with
a. transparent inspection window 41 and a con 10 ?9.nges 85 which extend a.long each side of the
slot 82.
necting cylinder 48 approaching closely adjacent’
It’ will be understood tha.t this particular work
the end of the work D, er if desired, slipped over
detail and detail of work support is not of itself
the end 0f the work D. Thug all dust created by
essential. For example, completed tubes may be
the operation of'the device is withdrawn from the
area of the work am]. ca.rried o?. However, under 15 operated upon in which means associated with
the tube itself employed for immobilizing the
mogt circumstances, I prefer to provide means for
opposite’ edges of the bottoni slot. With some
ca.using aid to about the motor 42, obtaining
modi?cations, the structure ma.y be employed to
the double result of cooling the motor and re
polish.or ?nish the interiors of tubes having no
moving dust and grindings from the Working area.
The tan 44 provides one method for air cooling 20 break in the surface;
It will be understoool that the elements B anal
anal dust disposal. It will be noted that the
C are so‘ proportioned that wheu the work tube
grinding head below described may also be pro
D is clamped in. position, it is properly aligned
vided with fan means as will later be seen.
Referring next to the grinding structure proper,
With the shell 25 a‚nd the motor and grinding unit
moves re.dially out’ of the shel1 25 into the work
the motor shaft 42a is snrroundecl by a sleeve 45
tube D and back through the work tube D into
keyed 0r otherwise ?rmly secured thereto. 49a,
the shell 25;
It Will be realized that whereas I shown
otherwise secured to the sleeve 49. Referring for
example to Figures 10, 11 and 12, I illustrate a
and described an operative device, still many
plurality of radial a.rms 50, four extending from 30 changes might be made in the size, shape, ‘ar
rangement anal disposition of parts without cle—
each of the hub plates 49a, each set of armg sup
parting materiallyfrom thespirit of my invention
porting a. ring 5I. The arms 50 ma.y include f‘a‚n
va.nes 52; the purpose of which has'already been
und I wish, therefore, that my showing be taken
49a, indicate a pair of hub disks pressed on or
discussed. The‚rings 5I de?ne between them a;
as in ‘a. large sense, illustrative o1‘ diagrammatic.
spa.ce for two or more shoes or Segment holders, 35 The use anti operatioi1 of my invention are as
‘generally indicated at 53. The inward moVementl
015 these segmentholders towara the axis of the
head is limited by inwardly extending ?anges 54
I provlde mea.ns for a.nd a method of ?nishing
interior cylindrical or partly cylindrical surfaces.
011 the opposite rings 5I. Each segment holder
My invention is weil adapted 130 ?nish interiors
includes an arcuate bottom 1313‚t6 55 with a ra 40 of more or lass elongated cylihdrical members,
dially inwardly extending ?ange 56 and side plates
such as pipes, conduits, a.nd the lik@‚ It ma.y be
51 terminating in inwa.rdly extending ?anges 58.
employed to ?nish interiors ofcylindrical tubes 01‘
The ?ange 55 has pivoted thereto a link 59, the
t0 ?nish generally cylindrical' inner surfaces,
opposite end of which is pivot€d to a lever 69'
which extend about less than 360 degrees of arc.
which with its associatzed— 1ever 6I forms a‘ bell
~ It may be employed to ?nish interiorsof aperu
crank lever structure Divoted at‘ 52 to the rings
tures in members, the exteriors of which are
5l. Adjustable on the lever 61 is a counterweight
square, rectangular or. in general, other than
63. 64 is a. spring extending from the unter end
cylind'rical. In the particular exempli?cation of
of the lever 51 to the hub Platos 49a where, if de
1ny invention herein described and shown, I move
sired‚ it may be secured to a. pin 65 extending be» - a motor anti grinder unit‘ axially along the ele
tween the hub plates. At the forward end 0f- the
ment to be ?nished. During the axial movement
shoe are lugs 66 to which a.-re pivotßd a»]ink 67
of the unit, the motor rotates the head in such
piVoted in turn as at 58 to the»rings 51. It may’
manner es to cause the abrasive segment 15 to
be adva.ntageous to provid'e acounterweight 59 at
thrust centrifugally outwardly agalnst the inner
the forward end-of the link 81. The arrow inFig-» lface 0f the work D. Centrifugal force is also
ure 12 indicates thedire?’ßi0n of rotation of the
e?ective to urge the counterweight 63 generally
above described heacl. 10 indicate removable
radiall‘y outwardly and there is a balance of two
abrasiVe or polishing Segments which are- pro» ‚
f0rces. By adjusting the counterweight 63 in
relation to its pivot 52, the centrifugal thrust of
the shoe sides 57. The rear end of the shoe is 60. the abrasive segment ‘i'll against the inner fa.ce of
open to permit the insertion of the seg'ments‘7ß‘
the workoan be adjusted. The Segments 70 and.
and a;ny suitable retaining plate ‘H could be em-»
the shoes in which they are mounted, are thrust
ployed. It may, for example, be slipped into slots;
outwa.rdiy in such fashion that centrifugal force
12 luthe ?anges 58. The plate ‘H may be locked«
permits them to adjust their position in relation
in itg inward position for example by the pin 13 7~ to tl'ie inner fa.ce of the work. For example, anal
which passes through an aperture 14 in the sho‘e
referring to Figure 12, the segment‘l? and .its
bottom plate 55.
supporting shoe are connected by the interme
Referring to the work and the work support, C
diate link 57 to the rings 5I aIs at 68‘and. the
indicates generally any suitable support or rack
1ink 59 provides a. loose connection Witli a center
for the tubular work D. It includes for. example
E2. Thus the subjection of the shoe‘and se‘gment‘
any suitable vertical supports 18 which may sup
to centrifugal force resultg in a generally uniform
port longitudinal extending angles ‘I9. Secured
thrust_ of all parts 0f the outer surfämes 0f the seg
to the angles are any suitable upwardly open,
ment' against the inner surface of the work.~
semi-circular supports 80. At the bottom of the
It will be understood, of course, that the
members 80 15 a longitudinally extending grooved'
counterweight 53 is so manipulated that the cen_
Vided with channels 10a to receive flanges 58, o1‘
trifugal thrust of the segment 70 will alwa.ys ex
In connection with adjusting the counterweight
63 it is important both for controlling the' (‘Lut
ceed the centrifugal outward thrust of the coun
terweight since otherwise there would be no
In the use of the device, I ?nd that it operates
not merely as a polishing or ?nishing device but
as a truing device. For example, if there are
pr0jections 0x- unevennesses in the inner wal1 of
the work, these unevennesses tend to be planed or
' ting pressure and for compensating for ‘ehe horse
power available; F01‘ example, where a, relatively
smal1 motor is- used in a smal1 taube, the thrust
cannot be asgreat as in the event a large motor
is used, or a.s in the event that the power source
is locat€d outside of the Bube.
It Will be also understood that where I employ
ground down With lconsiderable rapidity.‘ Inert-ia 10 the term “grinding element,” I wish it to be in
prevents a, certain adaptation of the shoe ‘I0, 130
terpreted as of su?icient breadth to cover any
lozal reductions in radius and thug inward pro
suitable grinding orv p'o1ishing element, polishing
jections or unevennesses tend to' be planed er
pa'ds or the like, and in general, any element
ground off. Experience indicates that not merely
operating in any sense abrasively against the
minor irregularities or sudden projections -are 15 suriace of the work.
taken out but tha_t the interior of the work is
It will‚also be understood that; where in the
ground down 120 a close approximation ‘eo a tru1y
claims, I employ the term “tubular” or “hollow
uniform diameter.
cylinder,” or “ho1low cylindrical element” I wish
It is even possible to convert a more 0r less
the claims to be interpreted broadly enough to
tapered taube from a tube of uneven diameter by 20 inc1ude elements in which the wa11 of the su'r
controlling the length of the passes anal giving
face to be ?nished does not extenc); entirely about
the t001 a progressively gmater numbey of passes
360 degrees cf an: and in which the exterior-of
through the initially more restricted part of the
the surface to be ?nished may -be squa1"e or
tube. My invention may thus be employed 1:0 0b
recta.ngular or oth‘erwise not cylindrical. 'I‘he
tain the following eifects: (a) The smooth ?n 25 terms “tubular” 01' “cylindrical” are not iIi-'
ishing of Ehe’ interior surface; (b) the elimina
tended to :be taken completely literally, as my
tion of irregularities and sharp variations in
method and appairatus are applicable to ?nish
radius of the inner surfaces; (c) the genßral tru
a Wide variety of structureg and a wide variety
ing up of the inner surface 150 give it, at a.ny ODE
of surfaces, so long as the surfaces to be ?nished
point, an approximation to truly circular cross 30 include a, substantial cylindrical area '0r a‘ sub
secbion; and (d) rendering the interior of the
stantial area, arcuate in transverse cross section.
tubular element of substantially uniform diam
eter from end 110 end.
A5 a speci?c example of a. practical operation
1. In a. ?nishing device for ?nishing the in‘
terior surface of a hollow gerierally cylindrica]
of my device, projector tubes for torpedoeg max! 35 element, a. motor means’, means for supporting
be initially formed from ?at sheets cf metal, the
it Within and' upon the surface t0 be treated
sheets being bent so that opposite edges approach
and for centering it Within said element, means
laut du not meet.
Such sheets ca.n then be
clamped in the supporting structurs C as shown in
for moving it axially along said‘ surface‘, and
a surface grinding element generally concentric
Figure. 15 with the opposite edges cf the sheet
abutting against the- flange 85. In that event,
the work is clamped in p0sition by the c1amps
With an driven by said motor means and includ4
.- ing a surface grinding member mountecl to mov‘e
’ 33.
After the initial smoothing has haken p1ace, ;
centrifugally toward the interior surface in re
sponse to its rotation -by the moto1j and means
for reversing the movement of said motor means
and surface grinding element When the surface
grinding e1ement reaches a predetermined point
the taube may then be completed änd provided
with its own ?ttings, surrounding rings, rein
forcements and the 1ike, rI'his, cf course, may
take platze remote from ’ohe structure shown
within the hollow e‘1ement.
herein. 'I‘he completed tube‚ with it5 longitudinal
2_. In a ?nishing device for ?nishing the in
track can then be dropped‘ into the supporting
terior surface of ‚a tubular element, a. carriage
structure C with its track aligned With the track 50 adapted to penetrante the element to ‘be ?nished,
29 of the shell 25. In that event, t-he member 8I
a. motor on seid carriage, a rotary grinding ele
is mmoved from the supports 8II. Then the tube
ment 0n said carriage and a driving connection
may hake its ?nal treatment so far as the present
between the grinding means and the motor,
mea.ns for propelling the carriage longitudinally
method is concerned.
It will be understood that the con‘o-acting mem
a1ong the element to be ?nished, a centering sup
ber or segment 10 may be formed. of any suitable
port adapized 130 receive ‘ehe carriage when the
substance. It may be abrasive 01‘ it may gonsist
carriage is withdrawn from the element, and
of or have secured thereto a. polishing element. ‘ means for supporting the element in axial align
Under smrie circumstances, it may even be desir
ment with said centering support.
able to Substitute a polishing pad or bu?er. Any 60 a3. In a. ?nishing device for ?nishing the in
suitable sealing means may be mounted inter
terior surface of a tubular ‘element, a‚'carriage
mediate the ends of the motor carriage 1:0 control
adapted to penetrate the element to be ?nished,
circulation of the air. It may be advantageous
a, rotary g?nding element; 0n said carriage and
for example 110 insure that air blows along the
motor means on said carriage for rotating it‚
key s1ot and cleans out the 100Se material result 65 meang for propelling the carriage longitudinally
ing from the grinding.
along and within the element to be ?nished‚ ‘a
It will be 'understood that the counterweighting
centering support adapted to receive the carriage
of the sh0e 53 provides an automatic adjustment.
and motor means when the cai‘riage is with
As the grinding material weamv away, the heavy
drawn from the element, and means for sup
meta1 shoe advances, further from the center of 70 porting the element in axia1 alignment with
centerin-g support.
' ‘
rotati’on, and thereby increases its centrifugal
4. In a. ?nishing device for ?nishing the in-~
weight. Also, the cnunterweight retra‚cts toward
terior surface of a, tubular element, a carriage
the center of rotation and thereby loses some of
adapted to penetrate the element to be ?nished„
its centrifugal weight. This compensates for
75 a. rotary grinding element on said. carriage and.
loss of actual weight of grinding material.
means for rotating i-t, means for propelling the
10». In a ?nish-ing device for ?nishing the in
~terior surfa‚ces of tubular elements, a. carriage
adapted to penetrante the tubular element to be
?nishecl, a rotary head mounted 0n said carriage
carriage longitudinally along the elemen1; to be
?nished, a centering support adapted 10 receive
the carriage when the carriage is withdrawn
from the element, an_d means for supporting the
element in axial aligmnent With seid centering
support, and means for preventing rotation ef carriage in relation 130 said element and
and means for rotating it„ anal means for mov
ing sadd earriage longitudinally a‚1ong anal within
€he »tubular element including a rack extending
10ngitudinally from seid carriage, a pinion in
said centering support.
mesh With said rack and means for rotating said
5. In a ?nishing dev-ice for ?nishing the in‘ 10 pinion a.nd driving mea‚ns für saic1 pinion includ
terior surface of a tubu1ar element, a carriage
ing a, frictional connection.
_ 11. In a ?niShing device for ?r‘1is‘hing the in
adapted 110 penetrate the e1ement to be ?nished,
terier Surfaces cf tubula.r‘ elements, a carriage
a»rotary grinding element; on said carriage and
adapted to penetrate the tubular element to be
meang for rotating it, means for propel-ling the
carriage longitudinally a;1ong the element 190 be 15 ?nished, a rotary head mounted on said carriage
.and means for rotating i-t, gmd means for moving
?nished„ a centering support adapt_ed to receive
said_ carriage 1ong‘itudina1ly along and Within the
the carr-iage when the carriag-e is withdrawn frem
tubnlar element including a rack extending longi
the element, a‘nd means; for supporting the ele
tudinally from saic1 carx‘iage, a pinion in mesh
ment in -axial alignment With said centering sup
port„and means for preventing rotation 0f said 20 with said rack and means for rotating said pinion,
and limit means. associated with said rack anal
carriage in relation to said element anal saic1
adapted 120 terminate the excursion cf the car
centering support includin-g a, member projecting
radially from said. carriage, said_ centering _sup—
12. In a ?nishing device for ?nishing the in
25 terior surfaces cf tubular elements, a carriage
adapt'ed to penetrate the tubu1ar element to be
6. In a ?nishing device f01‘ ?nishing the in
?nished, a, rotary head mounted 0n said carri&ge
terior surface of tubular elements‚ a, carriage
and means for rotating it, ano1 means for moving
including a, plurality of longitudinaliy sp‘aeeo'l
port and the e1ement 1:0 be ?nished being longi
tudinally slotted to receive said member.v
said carriage longitudinally along and Within the
frame elements connecting said rings’, means an 30 ti1bular element includihg a rack e‘xbendirlg longi
tudinally from sa‚id Carriage, a. =pinion in mesh
seid frame elementg for contacting the surface
ywith said rack and means for rotating said pinion,
120 be ?n-ished and means for moving said frame
and adjustable 1imit means a‚Ssociated with said
elements, with the surface contacting means
rack and adapted to termina.te the excursion of
thereon, into expanded position with the contact
the carriage.
ing means cdn’cacting the inner sxirface 130 be
13. In a ?nishing device for ?nishing the in
treated, and a rotary head mounted on said
yterior surfaces of tubular elements, a. carriage
carriage, and means for rotating it.
adä‚pted to penetrate the tubular elemen‘t to be
7. In a ?nishing device for ?nishing the in
?ni_shed, a rotary he'a'd mounted on said carriage
terior snrface o1‘ tubular elements, a carriage
including a plurality cf longitudinally spaced 40 and. means f0r rotating it, and means for moving
seid carriage longitudinally along and within the
rings, a plurality of longitudinally extending
tubu1ar element including a rack extending longi
frame elementg connecting sa1d rings, means on
tudinally 'from said carriage‚ a, pinion in mesh
seid frame elements for contacting the surface
with sa‚id rack and means Tor rotating seid pinion,
130 be ?nished. and means for moving frame
elements, with the surface contacting mea.ns 155 and means for changing the direction of drive 01
the pinion when the carriage reaches a predeter
thereon, into expanded position with the com
mined point in its movement along a tubular ele
t'acting means contacting the inner surface 110 be
treated including guiding meang f0r one of sa‚id
14. In a v\_?nirshing device for ?nishing the in
frame elements and yielding means tending nor
mally 150 urge 117 outwardly in relation 10 said 50 terior surfaces of tubular elements, a carriage
adapted 130 penetrante the tubula‚r element to be
rings, and a rotary head mounted on said car
?nished, a motor on said carriage, a rotary head
riage, and meang for rotating it.
on said carriage, a driving connection between
8. In a ?nishing device for ?nishing the in
said_ rotary head anal said motor and means for
terior surface of tubular elements, a carriage in
causihg a ?ow of air about said motor and across
cluding a plurality of longitudinally spa.ced rings,
the area of contact between seid. rotary head anti
a plurality of longitudinally extending frame ele
the work including fan means driven by said
ments connecting said. rings, means an said frame
elements for contacting the surface ‘so be ?nished
15. In a ?nishing device for ?nishing the in"
and means for moving said. frame elements, with
the surface contact means thereon‚ ini;o expandecl 60 terior surface 0f longitudinally s1otted tubular
elements, a carriage adapted 110 penetrate the ele
position with the contacting means contacting the
ment to be ?nished, a rotary grinding element
inner surface to be treated, and a rotary head
in said carriage, anc1 means for rotating it, mea‚ns
mounted on said carriage, and means f0r mtating
rings, a, plurality 0f l(mgitudinalyly extending
113 including a motor mounted. 011 and moving
for propelling the ca‚rriage longitudinally along
the element 110 be ?nished, a centering support
wii-‚h seid carriage.
65 adapted to receive the carriage when the carriage
9. In a ?nishing device für ?nishing the in
is withdrawn from the element, means for sup
terior surfaces of tu‘oular elements, a. carriage
porting the element in axial alignment with said
adapted 120 penetrante ‘ehe tubular element 120 be
centering support, and means for preventing
?nished, a rotary head mounted on said carriage
and means for rotating it, and means for mov 70 rotation of seid carriage in relation to saic1 ele
ment and said centering support, including key
ing said ca‚rriage longitudinally'along and within
means projecting generally radially from saic1 ~
the tubular element including a rack extending
carriage and penetrating said s1ot.
longitudinally from said carriage, a, pinion in
mesh With said rack and means for rotating seid
16. In a. ?nishing device for ?nishing the in
75 terior surfac'es of tubular elements, a‚ carriage
ädapted to penetrate the tubular element to be
element, the exterior suppdrt‘ihg' ?iearixä für ?hä
?nished‚ a rotary head on said carriage and
mea.ns for rotating it, mea.ns f0r moving said car
carriage incluclingr Walls in ge'r’i‘z'ai‘al alignment
with the tubular element and ä'däpt6d 130 rec‘eive
seid centering and supporting (alemärits _o'h the
carriage and to permit movemezit öf the ö‘är?alge
riage into, along, and out of a. tubular element,
and means for securing said. tubular element in
alignment With the path of movement of said eat
riage, means for supporting said carriage in align
into and out of the tubular elemerit, 0119 or mdre
fe‘ctiire when the carriage is in ‘ehe tubular ele
ment and when it is on seid exterior supporting
19. In a ?nishing device for ?nishing the in
terior gurface of a tubular‚ element, a carriage
adapted to penetrate the element to be ?nished',
cf said centering elements being positidm'a‘d 120
penetrate longitudinally extending slots in said
ment with said tubular element, and adja‚cent the
‘supporting means and in the tubular elemqnt,
end öf the tubul_ay element, when the carriage
has Ideen remove'd froni the tubu1a}r element, and. 10 and being adapted, in cooperation therewith,to
prevent rotation of the carriage.
means for preventing rotätio‘n of the carriage, ef
17. In a ?nishing deVice for ?nishing the in 15 centering and supporting connections betqw_een
the carriage and the opposed inner surface's of the
terior surfaces 0f tubular elements, a carriage
element, constituting the sole suppbrting means
for the carriage during its p'en'etratipn Within the
carriage adjacent an ena ofthe tub_ular element
element, meansfor preventing rotation‘ of the
and in alignment With the interior of said ele 20 carriage, a rotary ?nishing h'ead oh cärriage,
adapted to penetrate the tubular element to be
?nished, a supporting‘ means for supporting said
ment, centering and supporting elements on seid
carriage for engaging the inner face of the tubular
element, the exterior supporting means for the
a. motor supported on said carriage, adapted to
rotate said ?nishing head, and means' for pro
carriage including Walls in genera‚l alignment
within the tubular element.
pelling the carriage longitudinally along and
20. In a. ?nishing device im‘ ?nishing th€ ‚in
with the tubular element and adapted to receive 25
said centering and supporting elements on the
terior surface of a. tubular element, a. c9.rriage
carriage and to permit ready movement cf the
adapted to penetrate the element ’po be ?nished,
centering and supporting connections between the
carriage into and out of the tubular element, and
means, effective when the carriag‘e is Qn said sup
carriage and the opDosed inner surfaces of the
porting means and when it is in the tubular ele 30 element, constituting the so1e supporting means
ment, for preventing rotation of the carriage.
for the carriage during its penetration within ‚the
18. In a ?nishing device for ?nishing the in
element, means for preventing rotation cf -the
ca.rriage, a rotary ?nishing head on saiidcai*riage‚
terior surfaces of tubular elements, a. ca.rriage
a motor supported on said carriage, ada’pted to
adapted to penetrate the tubular element t0 be
?nished, a supporting means for supporting said 35 rofsa.te seid ?nishing head, and means for pro
pelling the carriage lon’gitudinally along am!
carriage adjacent an end of the tubular element
a.nd in alignment with the' interior cf said ele
within thg tubular elemeinä.
ment, centering and supporting elements on said
carriage for engaging the inner f ace of the tubular
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