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2,411,851,
M. CASERTA
‘ Dec. 3, 1946.
APPARATUS FOR AND METHOD OF SMOOTHING PUMP BORES
Filed April 17, 1944'
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Michele
Ca‘sefl‘a.
-
22* 57
Dec. 3,1946.
M. CASE’RTA
2,411,851
APPARATUS FOR AND METHOD OF SMOOTHING PUMP 'BORES
Fil'ed April 17, 1944 Y
s Sheets-She‘et 2
- I Michele Caserl‘a
Dec. 3, 1946.
v
_
M. CASERTA
2,411,851
APPARATUS FOR ‘AND METHOD OF SMOOTHING PUMP BORES
v Filed‘ April 17, 1944
M \
_
3 Sheets-Sheet 3
.
wks I
a
Michele Caseria '
2,411,851
Patented Dec. '3, i946
' UNIT EDI.’ ‘ STATE s
PATENT OFF-ICE‘
2,411,851
' APPARATUS FOR AND METHOD OF
SMOOTHING PUDIP BORES
Michele Caserta, Detroit, Mich., assignor to
Thompson Products, Inc., a corporation of
Ohio
Application April 17, 1944, Serial No. 531,430
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14 Claims.
(01. ‘51-34)
2
for forcing said blades radially outwardly and
for operating said means to adjust the ‘position
of said blades until they span a diametral length
-This invention relates to an apparatus for and
toa method of smoothing pump and other bores
‘without substantially altering the generated bore
equal to the diameter of the ?nished bore. The
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In the construction of rotary vane pumps such Cl smoothing operation is ‘e?ected by rotating and
reciprocating the-spindle carrying the blades rel
as described and claimed in my co-pending appli
ative to the pump liner. In a smoothing opera
cation Serial No. 397,763, ?led June 12, 1941,
tionas carried out by a, device of my invention,
the pump bore is so contoured as to make the
the radially extensible blades oscillate as a unit
operation‘of thepump substantially non-pulsat
ring.v This is accomplished by forming the bore 10 vin the diametral slot of the spindle end to follow
the contour of the bore as initially formed in
with a normal cross-sectional contour that com
much ‘the same way as do the slidable vanes of
prises a‘ pair. of opposite circle arcs having dif
the rotor in the ?nished bore of a pump liner dur
ferent radii but a common axis of generation, a
ing the operation of ‘the pump. , Accordingly, it
pairof opposite Archimedes spirals intermediate
is possible by the use of my invention to smooth
the circle arcs, and four parabolic spirals join
a generated pump bore having a constant. di
ing the ends of the circle arcs to the ends of
ametral dimension through its axis of generation
the Archimedes spirals, all of the curves having
in a very simple and, ef?cient manner, while hold
a common axis of generation and common tan
ing the bore to very close tolerances.
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gents at their points of juncture. A bore'of such
It is therefore an important object of this in
a contour is rather di?icult to form and to smooth 20
vention to provide an apparatus for smoothing
properly, since the tolerances must, be held very
bores of pumps, pump liners or the like where
close indeed and owing to the non-cylindrical na
such bores are of a generated contour having a
turerof the bore, special tools andgrinding de
constant diametral dimension through a com
vices have to be employed.
mon axis of generation.
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. : Iniaccordance with my present invention, the
It is a further important object of this inven
boreyof a pump, or Of-va pump liner, is formed in
tion to provide a simple and rapid method of
a series of operations... In the case of a pump
smoothing the internal surfaces of pumps, or
linen-a solid round billet is ?rst bored to form a
pump liner bores, and the like where such sur
cylindrical bore usingsubstantially the maximum
lengthof radius that can be employed and yet 30 faces are formed from a plurality of curved sur
faces having a common axis of generation and
have the cylinder lie wholly within the ‘desired
common tangents at their lines of juncture, but
contour of the ?nished .bore. Ports are next
are not cylindrical.
cut in the sidewall of the liner and the proper
Other and further important objects of this
contour of vthe bore 'formedtherein by cam turn
shape or contour.
invention‘will be apparent from the disclosures
ing or grinding, orby breaching. In this opera?
tion, the bore is formed accurately to. the desired
in-the speci?cation and the accompanying draw
ingSi
; contour, but, to a thousandth of aninch or so
. under the ?nal dimensions, just sufficient to per
On the drawings:
>
Figure liis a side elevational view of an appa
mit thedesired amount, of smoothing in the sub
sequent honing operation.
In the smoothing operation, to which the pres;
;»ent,_invention more particularly, relates,_ the
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40
ratus embodying my invention;
'Figure 2 is a fragmentary, front elevational
view to illustrate the operation of the clamping
mechanism for holding said pump liner in posi
smoothing is effected by a pair of abrasive sur
tion'during the honing operation;
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faces, which are extensible outwardly along the
diametral‘ plane in which they are mounted to 4 - Figure 3, is a fragmentary, top plan View of the
pump liner clamping and holding means;
bear against the internal bore surface of the
Figure 41S a fragmentary, side elevational view
pump liner with the desired amount of pressure.
of the pump liner clamped in position;
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To accomplish this, a device is used that simu
Figure 5 is an enlarged elevational View of a
lates in some respects the rotor and vanes of a
rotary vane pump, the abrasive surfaces, being
5
, provided by strips of honing stones or other abra
sive material carried externally by a pair of radi
ally extensible blades mounted in an adjustable
assembly within a diametral slot in the end of \
l a, rotatable spindle. The assembly includes means 55
finished pump liner;
Figure 6 is a diagrammatical cross-sectional
‘view of thepump liner'of Figure 5 indicating the '
axis of generation and the radii of the arcs and
curves of which the pump bore is composed; ’
Figure 7 is a partly diagrammatic view of a
52,411,851
3
4
cylindrical billet being initially reamed to a cylin
drical bore;
Figure 8 is, a fragmentary, enlarged, sectional
view taken substantially along the line VIII-VIII
of Figure 10, with the honing device at the lowest
‘point of its reciprocating movement and with the
honing strips radially retracted prior to the start
of the smoothing operation, with parts‘ in ele
holding mechanism is in its operative position,
the pin 38 extends into the pin receiving socket
39 and the pump liner engaging portions 36 and
31 are clamped over the upper edge of a pump
liner I4. In this position the lever 21 is sub
stantially horizontal and the lever 29 lies forward
of the'axis of the pivot pin‘132, which may be
considered to bathe dead‘ center point of the
mechanism. Accordingly, in its normal position,
vation;
Figure 9 is a view similar to Figure 8 but with 10 ‘the clamping mechanism can be thrown out of
the honing device at the top of its strip and with
the honing strips in operative position, with parts
in elevation;
Figure 10 is a top plan view of the honing de
clamping engagement only by a manual pull upon
the handle 28 to draw the lever arm 29 back and
thus lift the arm 21. The clamping mechanism,
' in its inoperative position, is illustrated in dotted
15 lines in Figure 2.
Figure 11 is a sectional view taken substantially
There is also mounted for adjustment upon the
along the line XI-XI of Figure 9;
1
post ll (Figure 1) a driving mechanism, indi
Figure 12 is a sectional view taken substantially
cated generally by the reference numeral 40,
along the line XII—XII of Figure 8 with parts
which comprises an arm 4| provided with a bore
in elevation; and
20 42 through which said post I I extends. A thumb
Figure 13 is a sectional view taken substantially
screw 43 is provided for locking the arm 61 in
vice;
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along the line XIII-XIII_ of Figure 9.
adjusted position upon said post. " A motor 44 is
attached to said arm 4! at one side of the post H.
Said motor has a vertical drive shaft 635 near the
The reference numeral Ill (Figure 1) indicates
generally a platform or base from which is
mounted an upstanding post H for supporting
the honing apparatus of my invention. Said ap~
paratus includes a work table I2 adjustably
mounted upon said post i! and adapted to be
held in adjusted‘position thereon by means of a
lower end of which is mounted a pulley 46. Said
pulley 46 is adapted to drive, by means of a belt
111, a secondpulleyJlB mounted upon the lower
end ofya spindle 49 that extends through: a bore
50 in the free end of said arm 4|. A second pulley
5| is mounted upon the extreme lower end of said
motor shaft 55 and is adapted to drive a disk 52
thumb screw 1%.
The work table 12 is provided on its upper face
with an annular, recessed holder 53 for receiving
the lower end of a pump liner Ill. Said holder
13 may be integral with the work table [2 or
mounted upon a pin 53 from the side of the
motor housing. Since the pulley 5| and disk 52
are in planes at right, angles to each other, a pair
of small pulleys 54 and-55 are used to guide the
‘?xedly attached thereto by- any suitable means.
The holder i3 is provided with a cylindrical socket
‘I 5 for receiving the lower edgeof said pump liner
driving, belt 55 that extends around said pulley
5i and disk 52. Said small pulleys 54 and 55 are
supported from the motorv housing by means of
a branched supporting bracket 51.
The pulley 1B8 is mounted upon the lower end
of the spindle 49 so that said spindle 49'm'ay be
It with a snug ?t. Both the table 12 and'holder
13 are apertured, as indicated by the dotted line
I6, to permit the honing device to project up
wardly therethrough into the interior of the pump
liner l4.
rotatedby the motor 44 acting through the drive
pulley 46 and the‘ drive belt 41. The hub 58
Also supported upon the table 12 is a clamping
mechanism, indicated generally by the reference
numeral 11. Said clamping mechanism I‘! (Fig
__ure 2) comprises a pair of upstanding plates i8
of said pulley 43 is keyed on said spindle 49 by
means of a spline 59 so as to permit reciprocal
4.
movement of said spindle. 49 along its vertical
axis, while the hub 58 is held against displace
ment vertically between the horizontal arms of
a U-shaped bracket 65 ?xedly secured to said
secured to said work table '5 2 in any suitable man
ner and having a spacer block 59 positioned
therebetween.
A rearwardly and upwardly in
clined arm 26 is rigidly held at its lower end be
tween said spaced plates H] by means of pins 2|
and 22 extending therethrough. At the upper
free end of said arm 28 there is pivotally mounted
to said arm, by means of a pivot pin 23, a pair
of lever arms 21 having bowed-apart end por-o
tions 24 and 25. ‘A strip 28 extends between said
end portions 25 and 25 inwardly of their extremi
ties. A lever arm 29, having at its upper free end
a handle 28, is pivotally mounted at its lower
end, as by means of a pivot pin 3!, between said 60
upstanding plat-es i8. Said arm 29 is also piv
otally connected near its free end, as at 33;, to a
pair of short links 33.’ The other'ends of said
links 30 are pivotally connected, as at 32 to the
arms 21. The outer free ends 23 and‘ 25 of the
lever arms 21 carry members 34 and 35, respec
tively, that are provided with dependent clamp
ing portions 35 and 31, respectively, adapted to
arm Ill. The horizontal arms of the bracket Bil
are apertured, as at 6|, to permit free passage
of the spindle 49 therethrough.
.
A sleeve 62 is mounted upon said spindle 49 nea
its upper end between'a pair of ?xed collars 63
and 64; Said sleeve 62 is loose upon the spindle
vMi but because-"it'is held between the collars 63
and 64 is capable of‘ transmitting axial movement
to said spindle t9. .Such axial movement is ac
complished through a crank arm 65, one end 66
of which is adjustable in a slot>51 of said disk
'52. The other end of said crank arm'65 is con
nected by means of a pivot pin 68 to one end of
a rod 55. The other end of said rod 69 is pro
vided withv an eye 10 which engages’ a shaft 1|
journaled in the spaced dependent sidewalls 12
of‘said table i2. A pinion 13 is ?xedly mounted
upon said rotatable shaft 1|, so’ that as the disk
52 is revolved, the crank arm 65,-acting through
overlie and engage the upper edge of a pump liner
the rod 53, causes said pinion 13 to revolve ?rst
l4. Said cross strip 26 is provided with a down- 70 in one and then in the other direction. Said
wardly extending pin 38 for reception in a re
pinion13 meshes with a rack 14 formed in the
cess or socket 359. There is one such pin vreceiving
recess or socket 39 in each end of a pump liner
sleeve 62, whereby said sleeve 52, and consequent
ly the spindle 49, is caused to reciprocate verti
l4 (Figure 5).
As shown in Figure 2, when the clamping and
‘ cally 'whenthe motor“ is running...
i As best shown in Figures 8 to .13, inclusive, the
meniber-M;v The degree of taper of the‘surfaces
upper end“ of the spindle _49sis.provided~ with ‘a
diametr'alIslotl5~whichextends clear to the end
of said spindle and is partially .closed by anover
85 and 85d and of the surfaces :86 and 86a, is,
of;' course,v.the 1 same so vthat the abrasive strips -8 I
and182: are maintained exactly parallel to each
lying'clisk .‘I6‘he1d‘ther‘eon by, means of screws
'I'Iu (Figure 10) .
Within said slot ‘I5 is mounted
" other, throughout their 'length while being moved
the smoothing .or honing mechanism, .indicated
generally by the reference numeral 11., Said
mechanism 1'! comprises'a pa'ir'of members. "I8
and ‘I9, held against'axial displacement between
radially outwardly during manual operation of
within ‘said slot ‘I5.v Each of said members ‘I8
means of a;reamer IOI.
the rod-93.5.-.’
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In v‘=‘1T)repa‘ring..:appump‘linerI4. for the honing
operationabout to be described,v a solid cylindri
the bottom 86 of said slot ‘I5 and the underside 10 cal billet»v may ?rst be provided with an eccentric
but truly cylindrical bore. I60 (Figure 7) by
of thecover disk ‘I6 but-bodily movable laterally
Said bore I 00 is then
re-formed to'the desired contour of the ?nished
pump 'linergasior. instance to the contour indi
abrasive strips 8| and ‘ 82; respectively. Said
strips!“ and 82 may suitably comprise honing 15 catedby the dotted line I02. This may be accom
plis'hed by broaching. Ports I03 and I04 are cut
stones and are replaceable ‘when P'worntoo thin.
into the: wall of the pump liner to the size and
The members ‘I8 and 19 are provided'along their
and '19 is longitudinallygrooved for receiving
shape desired, either before‘or after the breaching
operations The pump liner iI4 is also provided,
bers wider areas of contact with the walls of‘the 20 priorrto the honing operation, with the pin re
ceiving recesses 39 (Figure 5) extending inwardly
slot ‘I5 and thus prevent said members from
inner edges with opposed'tapered extensions 83
and 84 (Figure 11) that‘serv'e' to give said mem
fromieachi of thesend faces on thethicker side
wab-bling or becoming cocked in said slot. Each
of said members ‘I8 and. ‘I9 is further provided
at longitudinally > spaced points along their
of- the 'pump liner. These recesses 39 also serve
an'Palinement'i purpose in the assembly of the
lengths ‘with inwardly directedv abutment por 25 pump-liner in a pump such as. shown in my 00-‘
pending application Serial No. 397,7 63, ?led June
tions' 85. and 85a, and 86 and 86a for a purpose
thatwill later appear‘; Said members ls‘an'd ‘I9
v:"The bo'rei I92 .at‘the start of the ‘honing opera
are also provided with transverse slots 8'! and 81a
tion‘lis‘ slightly .undersize' as'compared with the
(Figures 8 and 9) for a purpose that willpresent
?nal dimensions of the bore IDZa (Figure 6)'in
ly be described.
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.12,1941_.=.;-'
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the ?nished pump liner. "Thecontourof theibore
‘~ Meansare provided for ‘forcing said members
‘I8 and'I9 laterally apart within the slot ‘I5. i" Such
means include an integrally ,formed member 88
will, in accordance with knowniprinciples, have a
common axis of generation, indicated bythe let'
ter ‘1A1 v(Figure 6'): which will be concentric with
(Figure 12) provided with‘a "slot l?9vexten‘ding
laterally completely therethrough. "Said :mem 35 respect to the outer cylindrical surface I05 of said
pump'liner. r-All' of the diameters of the pump
ber 88 (Figure ‘8) is formed‘with' a wedge-shaped
bore1'I82a passingvthrough said common axis of
‘generationfA will, of course, be of equal length.
In accordancewith oneimethod of obtaining, a
portion 89 at its upper end,lliiav'ingupwardly' con
vergent outer ‘faces 96 and’90a, and- at its lower
end with a‘wedge-shape'd' portion 9! havin'gialso
upwardly convergent edges 92 and 92a.~'?A rod
40
93 is provided with a ‘lower threaded portion 94
that is adapted to ‘be engaged in a threaded'bore
provided for‘that purpose in'the upper end of
said z'rirembertlig-v Said rod 93 ‘carries ‘at itsrup
per free end a'knur'led head795 to facilitate its
tremities' of- said arcs I06--I 81' :and- I08-—I 09 are
a3 pair of Archimedes: spirals Lille-III and H2
manual operation. » ‘At its- lower end thelrodi93
H3, which are joined to the extremities of- the
is provided with a portion 96 of reduced vdiam:
eter which is freely received in afsoclset ‘formed
in'a ?oating bridge member. 9'I.'v Said bridge
member 91 extends through the‘ slot'~I89 in said
member 88‘ and theends of vsaid bridge'member
extend freely» into the slots 91' and 81a in- said
members
wand-419.-
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circle arcs, by four, parabolic spirals, [OB-H2,
IU‘I-IIO,il08-,-III, and_I09-—II3. All of these
arcs and 'curveshave, a common axis of‘ genera
tionsA, and they also ,‘have common tangents at ‘
their. points; of junction. All of the diameters
passing'through said common axisiof generation
1
A, such asthe diameters I66-—.A—,-Iil8and I0fI-_— ,
‘With the'honing ‘mechanism 11 in the posi
tion shown in Figure 8,‘ that is with-the members
‘I8 and ‘I9’ in'their' inwardly" retracted state, a
A.'—.‘LI09.fare of equal length.
pump liner I4 can be slipped over theupper end
‘of said mechanism and clamped in‘ placelupon
the work table I2. The threaded’ shaft 93 is then
vmanually turned to move'the honing strip carry
ing: members ‘I8 and ‘I9 outwardly into the posi
tion‘ illustrated in ‘Figure 9. Upon threading
said shaft 93'intothe r'nember_88, said member
88 is drawn upwardlyand the‘action of the 'ta
pered surfaces 85 and 85:1,; and - 86 and 86a,v
non-pulsating pump, the contour ofthe bore I 02a
isformed by a pair of opposite circle arcspde?ned
at'th’ei‘r extremitiesby thepoints -I 06 and H11, and
bythepoints I88 and,,I09, formed with unequal
radiiz-R and r,-respectiv_ely, Intermediate therex
60
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."It-lwill be .understood,vof~ course; that the par
ticularlcon'tour 0f the bore‘iorms'no part'of the
present invention‘, but isdescribed merely, for the
purpose":of~illustration to show the type‘ of ‘work
for-whichxmyi honing apparatus is particularly
adapted- .IWhile capable of honing the surface of
a’tr'uly' cylindrical .bore,-Jthe a'pparatushere de
scribed 'is-im'ore “particularly designed for the hon
‘ingiiof'nonleylindrical‘ bores, which are neverthe
lessv formed iwithia vcommon ‘axis of. generation
vworking uponthe corresponding abutments 85
and'withfdiam‘eters of constant length.
and 85a and 86 and 86a cause‘said'members ‘I8
and ‘I9 to be spread apart laterally until the
be described:
The operation‘not my honing‘ device will now
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A pump liner-‘I4 is inserted over the upper end
surfaces of the honing ‘strips BI and 82 are in
working engagement with? theinside surface of 70 of the spindle 49 carrying the honing device with
the pump 'liner'rl?l The bridge 91, into which
thellower, end ofthe shaft’ 93 extends, prevents
longitudinal movement of said shaft 93 when ‘it
“is being threaded 1 into for ‘out. of; the ‘member 88
and'thus causes relative 'a'xial‘movement of- the
the‘honingistrips ‘8i and 82 in retracted position,
as'illustrat'edin Figure-8; The pump liner I4 ?ts
lsnugly‘in-to‘theirecess>I5 ofithe holder, I3; The -
clamping-v J mechanism 1 I1 is :then moved into
clamping-i position-,3’ as illustrated in full lines . in
2,411,851
7
8
Figure 2, the liner [4 having previously been
ping the motor 44 by merely grasping the knurled‘
turned until the centering and aligning pin 38
end 95 and giving the rod 93 a twist. With a fair
can be inserted into the socket or recess 39. The
amount of experience, an operator can easily de
lever 29 is then thrown over beyond the dead cen
termine to what extent to adjust the diametral
span of the abrasive strips 8| and 82, and adjust
ter to clamp the pump liner l4 securely in the
holder l3.
ments are made whenever necessary during the
operation of the device without interrupting ro
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Next, the rod 93 is manually turned to draw
tation ofthe spindle. Ordinarily, the honing op
upwardly the blade spreading mechanism 11 and
eration requires avery brief period.
thus force the honing strips 8| and‘82 outwardly
The necessity for the smoothing operation
into ?rm working engagement with the interior 10
surface of the bore |02a.
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arises from the fact that the bore cannot be per
.
fectly formed in the ?rst instance by broaching
or the like. Also, there is usually some distortion
due to the heat treatment step that follows
The motor 44 is next started up to begin the
honing operation. During the operation a cool
ing ?uid, such as kerosene, may be run over the
broaching.
entire honing mechanism. The skirt |2| protects
It is important to note that the method herein
the driving mechanism from the kerosene. The
length of the reciprocating stroke of the spindle
described does not control the shape of the bore
49 should previously have been adjusted, by ad
other than to insure constant diametral length,
but is effectiveonly in giving to the bore a smooth
justment of the eccentric pin 66 in the slot 61,
so that at the extreme positions of the spindle in 20 ?nish without substantially altering the generated
bore shape, and in making sure that all diameters
its stroke, the honing strips 8| and 82 always
through'the axis of generation A will have ex
span the full length of the pump liner |4, that
is, at the lowermost vposition of the spindle, the
actly the same length. This insures vthat the
upper ends of the honing strips 8| and 82 (Fig
pump vanes will have exactly the same end clear
ure 8) do not pass below the upper end of the 25 ance in all positions of the vanes within the bore.
pump liner l4, while at the extreme uppermost
If desired, the work table I2 can be swung very
point of travel of the spindle 49, the lower ends
slightly one way or the other to cause the abrasive
of said honing strips 8| and 82 still lie below the
strips 8| and 82 to bear more heavily when riding
bottom edge of the pump liner M. This provision
across the ports I03 and I04, thus giving more
is importantif a straight Walled bore, rather than 30 clearance at those points and closer clearance in
the pumping zones between ports, when the liner
a bell mouth bore, is to be obtained. The amount
of the reciprocation of the honing strips 8| and
is assembled and the pump is in operation.
82 is preferably such as not to bring the ends of
In order to permit the honing strips to be
changed without taking the closure disc 16 off and
said strips within the cut-out wall portions form
ing the ports I03 and I04, since there would then
lifting the mechanism 1'! out of the slot 15, the
rim of the annular holder l3 (Figure 3) is cut
be a tendency for the ends of the strips, if com
away at opposite sides as at I20, to the lower edge
ing within said cut-out portions, to catch on the.
of the liner. The strips 8| and 82 can thus be
edges of the port openings and eitherbe damaged
removed laterally and changed with a minimum
or wear away said edges unevenly,
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of effort.
v
In usual practice, the amount of abrasion of
It will, of course, be understood that various
the wall of said bore I02 effected by the'honing
details of construction may be varied through a
operation is of the order of 0.001 inch and is not
wide range without departing from the principles
intended to accomplish other than a, sufficient
of this invention and it is, therefore, not the pur
smoothing operation to make possible a smooth
pose to limit the patent granted hereon otherwise
sliding ?t between the bore and the vanes of the ‘
than necessitated by the scope of the appended
rotor when the pump is assembled in an operat
claims.
ing condition.
What I claim is: I
As the spindle reciprocates, it is also rotated by
1. Apparatus for honing the internal surface of
the drive including the pulleys 46 and 48 and the
driving belt 41. The rate of rotation is suitably - a hollow article, the bore of which ‘has been
formed with joined dissimilar surfaces of genera
in the neighborhood of 400 R; P. M., but slower
or faster rates of revolution can be employed de
pending upon the type of work being done. As
the spindle rotates, the entire blade carrying
tion having a common axis of generation and
diameters of constant length, said apparatus com
' prising a rotatable and reciprocable member hav
such displacement along their diameters, the
ing a diametrally extending slot, radially adjust
able blades slidably positioned for movement in
said slot and having strips of honing material
projecting outwardly therefrom, means for ad
justing said blades tobring said honing material
into working contact with said internal surface
and hold said blades after adjustment in rigidly
members 18 and 79 slide Within the slot 15 with
their upper edges confined by the closure J6. and
with their lower edges resting against the lower
.wall 80 of said slot 15. As previously explained,
the extended contact surface areas provided by the
extensions 83 and 84 between said members 18 and
?xed spaced relationship, and means for rotating
and reciprocating ‘said member within said bore
to effect the honing of said surface to smooth the
same without materially altering the curvatures
of said surfaces of generation, said blades being
freely oscillatable in said slot during said honing
‘I9 and the lateral walls of said slot 15 Y tend to
operation to permit said honing material to follow
mechanism ‘H oscillates as a unitlaterally in a
series of diametral planes, the honing strips 8|
and 82 remaining in ?xed spaced relationship rel
ative to each other.
The movement of the as
sembly is similar to that of .the vanes of a rotor
in the operation of a vane type pump. . During 60
prevent wabbling or cocking of the members with
the contour of said internal surface.
2. Apparatus for honing the internal surface of
70
in the slot.
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> During the honing operation,‘ it maybe desir
a hollow article, vthe bore of which has been
formed with joined dissimilar surfaces of genera
able to adjust the honing strips 8| and .82 out
tion having a common axis of generation with all
wardly into closer pressure relationship with the
surface of the bore undergoing the smoothing op
eration. ‘This can ‘be accomplished without stop
is
of the diameters of said bore, passing through
said axis of constant length, said apparatuscom
52,411,851
‘prising a‘rotatabl'e ‘and reciprocable member'hav
;ing a diametrally ‘extending slot, radially adjust
able blades ‘slidably'positi‘oned. in said‘ slot_ and
having strips of honing material projecting out
wardly therefrom, means for adjusting said blades
to bring said honing material into working-‘con
‘tactvwith said internal surface including means
for holding said honing-material in adjusted ex
tended'position'with the desired contact pressure
againstlsaid surface‘, and means for ‘rotating and
vreciprocating said member-‘within said bore to
effect the honing of said surface to smooth the
same, said'blades and blade adjusting and holding
means being freely oscillatable in said slot to per
mit said honing material to follow the contour of
T10
cylindrical member‘ having" 'a' ‘slot extending
diametrally therethrough,’a pair of radially. op
posed blades mounted in said slot for movement
therein along a diametral plane, honing strips
carried by said bladesv and projecting outwardly
therefrom, tapered elements for engaging inter
nal faces of said blades, adjusting meansasso
ciated with said tapered'elements for moving
said blades radially outwardly uniformly of their
lengths,>said-adjusting means including an'ex
.tension' projecting beyond an end of said cylin
drical' member and manually operable during
rotation of said’ cylindrical member, said honing
' strips, tapered'elements and adjusting means
constituting a unit of rigidly ?xed diametral
‘length for any given adjustment and said~unit
‘being movable in said slot, and means forrota't
the curvatures of said surfaces of generation;
ing said cylindrical member to cause said honing
3. Apparatus for honing‘ the internal surface
strips to smooth an internal bore with which said
of a ‘hollow article, the bore of which has been
formed with joined dissimilar surfaces of genera 20 strips may be adjusted into contact.
said internalsurface withoutmaterially altering
tion having a common axis of generation and
constant diametral dimensions, said apparatus
comprising an adjustable supporting ?xture for
holding said article with the bore thereof unob
structed, a- rotatable and reciprocable member -
having a diametrally extending slot, an assembly
slidably positioned in said slot and having strips
of honing material projecting outwardly there
’ from, means associated with said assembly for
extending said blades to bring said honing mate
rial into working contact with said internal sur
face, and means for rotating and reciprocating
said member within said bore to effect the honing
of said surface to smooth the same, said assembly
being freely oscillatable in said slot to permit said '
honing material to follow the contour of said
internal surface without materially altering the
curvatures of said surfaces of generation.
8. In an apparatus of the class described, a
rotatable and reciprocable shaft having an open
ended slot extending through the axis thereof,
a closure member for the end of said slot and
an assembly retained by said closure member and
freely oscillatable in said slot as a unit of ?xed
diametral length during operation of said shaft
including outwardly projecting parallel strips of
abrasive material for the smoothing of internal
surfaces.
9. In an apparatus of the class described, a
rotatable and reciprocable member having a slot
extending through the axis thereof and an as
sembly freely oscillatable in said slot during oper
ation of said member including outwardly pro
jecting strips of abrasive material for the smooth-7
ing of internal surfaces, said assembly also in
cluding tapered elements associated with said
strips for moving the same into outwardly pro
jecting position and means for actuating said ta
40
member having a diametral sl'ot, radially opposed
4. In an apparatus of the class described, a
blades insaidslot carrying outwardly projecting
honing surfaces, tapered rigid elements between
' said blades and in contact therewith for moving
said blades into radially extended positions, and
an adjusting member cooperating with said ta
pered elements to effect such radial extension of
said blades and said tapered elements, said blades
pered elements during operation of said member.
10. In an apparatus of ‘the class described, a
rotatable and reciprocable member having a slot ,
extending through the axis thereof and an as
sembly freely oscillatable in said slot during op
- eration of said member including outwardly pro
jecting strips of abrasive material for the smooth
ing of internal surfaces, said assembly also in
cluding tapered elements associated with said
diametral plane without change in diametral
strips for moving the same into outwardly pro
50
length.
jecting position and means for actuating said ta-’
5. In an apparatus of the class described, a
pered elements during operation of said member,
member having a diametral slot, radially opposed
said means including a ?oating bridge and a
blades in said slot carrying outwardly projecting
manually operable member coacting therewith to
honing surfaces, means associated with said blades
cause said tapered elements to force said strips
for moving said blades into radially extended
outwardly.
positions and providing a rigid backing for said
11. The method of smoothing an internal non
blades, and an adjusting member cooperating
.cylindrical surface composed of a plurality of dis
with said means to effect such radial extension
similar surfaces‘ of generation having a constant
of said blades, said blades and said rigid backing
diametral length through the common ‘axis of
means being oscillatable in said slot along a
generation of said surfaces, said method compris
diametral plane‘ without change in diametral
being oscillatable as a ‘unit in said slot along a
ing adjusting a pair only of honing surfaces ;
length.
'
'
6. In an apparatus of the classdescribed, a
radially outwardly into working contact with said
internal surface, said honing surfaces being
member having a diametral slot, radially opposed
blades in said slot carrying outwardly projecting 65 maintained in parallelism in all positions to the
common axis of generation and being oscillated
-without
relative movement therebetween in
blades for moving said blades into radially ex
qplanes passing through said common'axis of gen
tended positions and providing a rigid backing
eration and rotating and reciprocating said hon
for said blades, and a manually operable threaded
ing
surfaces relative to said internal bore surface.
adjusting member cooperating with said tapered "
12. The method of smoothing an internal sur
elements to effect such radial extension of said
face the contour of which is composed of a plu
blades, said blades and tapered elements being
rality of dissimilar surfaces all having a common
oscillatable as a unit in said slot along a diam
axis of generation and the diameters of which
etral plane without change in diametral length.
passing through said common axis are all of con
'7. In an apparatus of the class described, a.
honing surfaces, tapered elements between said
11
2,411,851
'stan-t length, said method comprising adjusting a
pair only of honing surfaces radially outwardly
into pressure relationship with said internal sur
face throughout the length thereof, holding said
honing surfaces in relatively ?xed spaced parallel
relationship to the common axis of generation but
freely oscillatable in all diametral planes .pass
ing through said common axis of generation and
rotating and reciprocating said honing surfaces
‘relative to said internal surface While maintain
ing said honing surfaces at all times parallel to
each other and in abrading relationship to said
internal surface to smooth the same.
13. In an apparatus of the class described, a
rotatable and reciprocable shaft having an axially
elongated slot extending transversely there
through, and an assembly con?ned within the
axial length of said slot but freely oscillatable as
a unit of ?xed diametral length in said slot trans
12
.versely of said shaftduring operation thereof,
said assembly including a pair of diametrally op
.posed, outwardly projecting, narrow strips of
abrasive material for the smoothing of internal
surfaces.
14. In an apparatus for ?nishing a generated
bore the cross section of which is characterized
by the diameters through its center of generation
being all of the same length, a member rotatable
10 about the axis of generation of said bore and
axially reciprocal along said axis, said member
being provided with a slot in a plane passing
through said axis, and an assembly in said slot
oscillatable therein as a'unit, said assembly in
cluding a pair of opposed parallel abrasive strips
to contact the wall of said bore and including
means to positively spread said abrasive. strips
While keeping the same parallel to said axis.
MICHELE CASERTA.
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