close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2122072

код для вставки
June 28, 1938.
c. T. ROTTLER
2,122,072
AUTOMATIC FEED FOR BORING BARS
Filed March 25, 1936
3 Sheets-Sheet l
.60
f"
5/! 4;;
26
2
*
62
22 25
1'
Zld
O
6C)
r
97
_
24 2
K20
Fig’. 7
Ema/whole
Clarence T‘. Ro’dlen
mgmzgwm
_ June 28, 1938.
c. T. ROTTLER
I
2,122,072
AUTOMATIC FEED FOR BORING BARS
Filed March 25, 1956
3 Sheets-Sheet 2
T5
T2
24
70
I
7
/ ‘ME’
Clarence T. Bauer
_
June 28, 1938.
c, T_ ROTTLER
2,122,072
AUTOMATIC FEED FOR BORING BARS
vFile'd March 25, 1936
3 Sheets-Sheet 3
gwucnto'n
Clarence T. Ro-Pcler
2,122,072‘
Patented June 28, 1938
UNITED STATES PATENT OFFICE
2,122,072
AUTOMATIC FEED FOR BORING BARS
Clarence T. Rottler,‘ Seattle, Wash.
Application March 25, 1936, Serial No. 70,857
(01. 77-2)
My invention relates to boring bars, that is, upward or downward limit of its movement, in
machines usually employed in reboring the cyl ' order that reversal thereof, or the throwing of
inders of internal combustion engines, of the the same into neutral position, may be accom
general type illustrated in my Patent No. plished.
14 Claims.
5‘
2,011,875.
-
'
-
‘
It is a further object to simplify the driving 6 .
'
: It is particularly an object of the present inven
- ‘tion to provide means controlling movement of
the boring bar whereby it may be fed slowly down
ward, moved upward, or moved downward rap
l0 idly, and whereby all such movements may be
either necessarily under control of the operator,
or under control of elementslwhich will auto
matically stop or reverse the movement of the
boring bar upon completion of a predetermined
l5 amount of such movement, to the end that the
operation of the boring bar may be made sub
'
stantially automatic.
Y
The term “feeding”, as herein used, shall be
taken " to mean “movement”, whether during
mechanism of such a boring bar, and to con
dense it into the smallest practicable space, to
the end that the boring bar may be neat and
compact, and of weight sufficiently low that it
may readily be moved from place to place, as 10"
required.
It is a further object to devise an accurate
boring bar, yet one wherein the component parts
need not be ?nished or ?tted with extreme ac
curacy, thereby lessening the cost of production 16
and the liability to get out of order.
It is an object to devise mechanism which will
insure rotation of the screw and nut at iden
tical speeds, when the control mechanism is in
maybe Ireadily adjustable in‘ accordance with
neutral position, so that there will be no tend- 20
ency for the boring bar to move up and down,
when it is intended that it shall stand still. This
makes possible the use of a tool-lapping arrange
ment disclosed and claimed in my copending ap
25 the depth of the cylinder upon which the boring
plication Serial No. ‘70,858, ?led March 25, 1936. 25
20" cutting operation of the boring bar’s tool bit, or
otherwise.
'
~
It ‘is a further object to provide automatic
control mechanism for'slow downward feed which
bar is operating.
'
It is a further object to provide interlocking
mechanism' and such arrangement of the several
controls that one control only may function at a
30v time,'to‘ the end that there cannot be interference
I between two different drive mechanisms, each
driven from the same source of power.
~ It is a'further object to devise control and'feed
mechanism of this general type which can be
35 thrown into a neutral or‘a nonoperative position
at‘any time, as for example, in an emergency, to
My invention comprises the novel boring bar‘
and the novel arrangement and combination of
the parts thereof, as shown in the accompanying 30,
drawings, described in this speci?cation, and as
will be more particularly pointed out and de
?ned by the claims which terminate the same.
In the accompanying drawings I have shown
my invention incorporated in a preferred form of 35
boring bar, and in a form now preferred by me,
stop *all feeding movement of the boring bar.
More speci?cally, it is an object to devise con-v
it being understood, however, that such changes
trol mechanism which may be positioned in a
rangement of the parts, within this disclosure,
40 given ‘position to accomplish downward feed of
the'boring bar, and adjustable automatic re
versing mechanism cooperating therewith which,
at the‘predetermine'd limit of downward move
,
These and other objects will be better under
stood as the present speci?cation progresses.
ment'of the boring bar, will automatically reverse
45 the vcontrol mechanism‘to commence upward
movement of the boringbar, and further, to de
vise means which upon the completion of the up
Ward‘movement' of the boring bar ‘will automati
cally throw the control mechanism into neutral
50 position, thereby stopping movement of. the bor
ing bar, and ‘holding it in its uppermost position,
It is also an object'to provide latching mecha
nism to hold such controls in either position,
which, latch mechanism is automatically disen
55‘ gagged upon the ‘boring bar reaching either the
may be made in the form, proportion and ar
as may be included within the claims.
40
Figure 1 is an elevation of the boring bar,
parts being broken away, and the cylinder block
being shown fragmentarily and in section.
Figure 2 is an elevation, with parts broken
away, of the upper end of the boring bar, and 45
Figure 3 is a section through the same substan
tially on the line 3-3 of Figure 2.
Figures 4, 5 and 6 are transverse vertical sec
tions through the head of the boring bar, taken
on the respective lines 4—4, 5—5, and 6--6 of 50
Figure 2, Figures 5 and 6, however, showing
'
parts in a different position than that illustrated
in Figure‘ 2.
Figure 7 is a detail section through the control
handle and latching means.
55
2.
2,122,072
The hollow boring bar 9 is vertically slidable in
suitable bearings within a base 99, and on its
lower end is rotatable a cutter head 9| carrying
52. Fingers 50 on this rock shaft engage a collar
94” on the rod 94 to raise it when the rock shaft 5
the ?y cutter 92. Projectable ?ngers 93, movable
inwardly and outwardly at will, are also provided
is suitably rocked, thus to effect or permit with
on the cutter head, and a rod 94, extending ax
ially through the axial bore of the boring bar 9
drawal of the tool 92 inwardly of the cutter head
9|. Another ?nger 5| engages in a groove 14'
and terminating in a handle 94’, is rotatable
to control projection and retraction of the fin
10 gers 93, and is vertically movable to control pro
jection and retraction of the tool 92. A handle
or lever 99 enables manual lifting of the rod 94
when required.
A motor 95 is preferably mounted upon the
15 base, and extending upwardly from and geared
to the motor, to be rotated thereby, is a shaft 96.
This is journaled in the base and extends through
the head 91, carried by the upper end'of the‘
boring bar 9 and constituting a gear casing. The
shaft 96 is screw threaded (right-handed, and
rotating in the direction of the arrow A in Figure
5, as shown) and terminates at its upper end in
an enlarged handle 96'. These arrangements
(other than the use of a screw which rotates in
25 the indicated direction, with relation to the di
rection of its thread) are not part of the present
invention, but known in the prior art, and no fur
ther detailed description thereof is deemed nec—
essary, nor is it deemed necessary to describe the
30 anchor 4 in detail, this comprising a portion
which is supported within a cylinder other than
the one being worked upon by the cutter 92, and
which‘ is secured to the base 90 to hold it down
upon the top of the cylinder block.
35.’.
otally received in the interior of the head 91,
_and which may be rocked by the control handle
The drive’- arrangement for the boring bar is
somewhat different from that shown in my pat
ent referred to above, and will be described for
better understanding of the invention. The
screw threaded shaft 96 is longitudinally grooved
as indicated at 96" to receive a key 19 whereby
a gear 1, which constitutes the‘ driving gear, is
secured to rotate with the shaft 96. Loosely
mounted upon a sleeve 1‘ integral with the gear
1 is a gear 10, which has a slightly different num
,; ber of teeth than the gear 1, preferably one more
tooth, so that the two constitute differential gears.
Both these gears mesh with a gear ‘H, and the
gear 10 is provided with clutch elements 12 with
which may be meshed complemental clutch ele
ments 13 upon a slidable clutch sleeve 14. This
sleeve 14 is keyed at 75 to a nut 16 threaded upon
the threaded shaft 96.
'
'
The slidable clutchvsleeve ‘M is further pro
vided with gear teeth 78, with which is meshed
55: a. gear 6. With the driving gear 1 is meshed a
smaller gear 60, loose upon a stub shaft 6| and
provided with clutch elements 62 capable of en
gaging with complemental clutch elements 63
upon the large gear 6. A spring pressed plunger
64 (see Figure 2), received in an axial bore'of
the stub shaft 6|, normally holds the complemen
tal clutch elements 62 and 63 out of engagement,
but the two may be engaged by a yoke 58, acting
through a lever 51 fulcrumed at 56 to‘press down
ward the pin 65, guided at 66 in the head 91,
when the yoke 58 is raised (compare Figures 2
and 6), such raising of the yoke 58 being accom
plished by raising the control handle 52, as will
be later described in detail.
As a result of en
gaging the clutch elements 62 and 63, the head
9'|~and the boring bar are moved rapidly upward.
Control of the engagement and disengagement
of the member 14, whereby to control movement
of the latter. When the control handle 52 is
shifted upwardly the clutch elements 13 are dis 10
engaged from clutch elements 12, and when said
handle is shifted downwardly T3 is engaged with
12. Upward movement of the control handle 52
engages the clutch elements 63 and 62, and down
ward movement permits their disengagement,
hence there can never be a tendency for down‘
ward slow feedlby engagement of 13 and 12)
at the same time as fast upward feed (by engage
ment of 63 and 62).
If it is'desired to effect downward feed of the 20
boring bar at a slow rate, the clutch'elements 12
and 13 are engaged (see Figure 5) by downwardv
movement of the control handle 52, as indicated
above. Note that this permits the rod '94: to be
lowered, and this lowering movement, by means 25
not shown, but knownin'the art, effects outward
projection of the tool 92 to the diameter of the
cylinder to be'cut. With the clutch elements 12
and ‘I3‘engaged, rotation of the shaft 96 through.
the key 19 rotates the driving gear 1, which inv
turn rotates the idler gear 1|, and this rotates
the gear 70. In turn the sleeve 14 is rotated by
the engagement of the clutch elements 12v and
13, and the sleeve 14, being keyed to the nut 16,
rotates the latter, but since the gears 1 and 10
contain a different number of teeth, they Will
rotate at a slightly differential rate, so that while
the shaft 96'andlthe nut 16 both rotate, their
rate of rotation will be different, and the ‘combi
nation will effect downward feed of'the boring 40
bar at a slow rate. Meantime the cutter head
9| is being rotated, since the gear ‘I |, driven ‘from
the driving gear ‘I, is secured to the hollow shaft
1|’, passing through the axial boreof the boring
head 9, and carrying the cutter head 9| at its
lower end.
v
When it is desired to move‘the boring :bar up
wardly, the slidable clutch elements 63 are shift
ed, as described above, into their lower posi
tion (compare Figures 2 and 6) to engage the‘
complemental clutch elements 62; This neces
sarily disengages clutch elements 13 and ‘I2, and
increases the rate of rotation ‘of the sleeve‘ 14
and consequently of the nut 16 keyed thereto, by
reason of the difference in size of gears 60 and 6,
and since the screw 96 continues to rotate at the
same rate, this will effect upward movement of
the boring bar at a rapid rate..
If it is desired to effect more rapid downward
movement of the boring bar, as, for example, 60
when" using the centering ?ngers‘ 93 to ‘prelimi
narily align the axis of the boring bar with‘the
axis of the cylinder, this may be accomplished by
stopping rotation of the sleeve 14 and nut 16.
This is readily accomplishedby pressing inward
the button 8, against its spring‘ 8|,‘ whereby-its
inner end 82 engages one of several notches 11 in
the exterior of the sleeve 14. The nut 13 being
thus held stationary, but the screw 96 ‘continuing
to rotate, the head 91 and-the ‘boring bar are 70
moved downward rapidly. As will be evident
from inspection of Figurev 5, engagement of .pin
of clutch elements 73 and 12, and of clutch ele
82 in a notch 11 can only occur when sleeve 14' is
ments 63 with62, may be accomplished‘by a rock
shaft 5 (see Figures 2, 3, 4, and 6), which is piv
in a neutral position, at which time neither
clutch 13 12, or 63, 62 is in engagement. Since
3
‘2,122,072
the pin 82'wil1 only remain in engagement with
1.1 soilong as it‘ispressed inward against the
spring 8|, ‘it is'assured that the operator will
stand by, to prevent rapid downward feed to
complish corresponding movement of theboring'
bar, it being remembered that downward‘ mo've-.
ment of the control handle 52 engages slow down
feed clutch elements 13 and 12, and upward move
progress further than, is desired.
ment of the control handle engages fast up feed
‘
I’
~ ‘
e
clutch elements 63 and 62. Another ?nger button
21 may be‘ provided on the lever 2|, which when
" It will be‘ seen. from the above that theseveral
clutch elements are so interconnected. and ar
pressed or struck will always (as in an emer
ranged that there can not be engagement of any
two sets of clutch elements at anyone time.
10
_
The base 90 is provided with a‘-boss 90' and a
set screw 90". (see Figure 1), in which is received
a vertical rod 3. This rod, which is held by the
bore to- extend parallel to the axis of the boring
bar 9, extends vertically upward, and its upper
end is axially bored, as indicatedlin Figure 5, to
receive a compressible spring 3|],-v holding up
gency) disengage the latch 20 from'the, stud‘2,
and permit thercontrol handle 52 to return to its 10
neutral position, stopping all feed of the boring
bar.
“
,
>
1
'
The rotative screw head 96’ may be employed
as a, grinding and lapping tool, as disclosed in my
companion, application, Serial No. 70,858, referred 15
to above. In' so doing the tool bit is held in a-jig
wardly a headed plunger 3|. Also formed on the _ secured to the casing 91, and no variation in‘ the
vertical position of the head 96' relative to the
casing‘ 91 can be permitted. Using a left—handed
20 in the path of movement of the control handle thread, turning in the direction of the arrow A 20
52,, so that as the latter, moving with the head . (Figure 5), as in my Patent No. 2,011,815, I dis—
91, approaches the. desired lower limit of its covered that there was a tendency with the sleeve
14 in neutral position, for the casing 91 to move
. movement, at which time the cutting tool 92 will
have passed beyond the lower end of the cylinder upwardly, then downwardly, with considerable
upper end of the rod 3 is a cam surface, in the
shape of a cone 32. The plunger~3| is positioned
which‘ it is'reboring, the plunger will have been
depressed by vprevious contact with the control
handle 52, and the spring ‘30 will have been com-_
‘ pressed. If the control handle 52 had been there
'tofo-re latched or held in its downward position, to
?uctuation in load on the motor, indicating re
25
curring friction in the machine. ‘The upward
movement, I discovered, was due to the tendency
of the nut 16 to climb the screw 96, and to jam
against the top of the casing 91, moving the lat
is ,now unlatched or released, this compression
ter upward,then, as the load on the motor, or the 30
movement'of the casing, relieved or overcome the
of the spring 30, acting ,through the‘plunger 3|,
will throwthe control handle 52 upwardly into
speed as the screw, the casing would drop, and,
39 accomplish downward feed of the boring bar, but
position to engage the clutch elements 63 and 62,
thereby initiatingupward movement of the bor
ing bar.
"
.
"
~
>
In order to control the point of this reversal I
provide latching means to hold the control handle
‘ .52 ,either in its downward position _or in its up
ward position). Such latching means, best shown‘
-in Figure '1, may comprise a square-headed stud
2 ?xed in the casing 91, anda latch 2|] formed as
‘part of a lever 2| pivoted at 22 upon the outer
endv of the control handle 52. A spring 23 tends
45 to hold the latch 20 in engagement with the stud
2. .Thellever 2| carries a ?nger 24 atits lower
end, which will engage the cam or conical surface
32 upon compression of, thespring 30 to a-desired
extent, and the lever 2| will thereby be rocked
50 to an extent to disengage the latch 20 from the
stud 2, so that upon apredetermined amount of
compression of the spring“ the'latchlng means
will be disengaged, to throw the control handle
52 into its upper position, corresponding to up
ward feed of the boring bar, whereuponthe latch
20 will engage the upper side of the stud 2, being
pressedv ‘inward by the spring 23, and upward
movement of the boring bar will be effected. It
vwill'be seen that. the-point of disengagement and
reversal may becontrolled by adjustment of the
rod 30 vertically in its, boss 90’, and that it may
be held in any adjusted position by the set screw
90!!-
,
~
.
friction resisting rotation of the nut at the same
the upward movement would recur.
.
~
Merely to provide an antifriction bearing, as at 35
98, was found not to avoid this tendency, hence,
by reversal of the direction of the screw threads
(making it right-handed instead of left-handed),
continuing the same direction of rotation of the
screw, and making the differential gear 1|) with
one (or'more) tooth more than the driving gear
1, I found that the tendency for the nut 15 to
climb up the screw while in neutral was con
verted into a tendency for it to move downward
on the screw. While this might be considered 45
immaterial—its immovability with respect to the
screw being the desideratum-it will be observed
that any tendency for the nut to move down—
wardly will only result in a pressure of the nut
on the extension _1’ of the gear 1. Since the 50
latter is keyed to the screw and must rotate
therewith, and as any pressure of the nut upon
the gear 1 will tend to cause the two to rotate at
the same speed, it follows that’ any such pressure
only brings about the very result desired, without
any friction.‘ The motor load is therefore steady
and light, and the objectionable upgand down
movement of the casing 91 is completely over
come by this change.
Upwardthrust from the nut to the casing 91,
such as occurs during upward feed of the bor
ing bar, with the nut rotating in the same direc
tion as and more rapidly than the screw, is taken
by the antifriction bearing 98, and as the‘motor
Upon reaching ‘the upper limit of movement of
the boring bar a second ?nger 25 (see Figure 5) ' is free at such times from any other load, this is 65
on the lever 2 I, positioned to engage beneath the unobjectionable. I have found that the present
head 96’ on the screw 96, comes into engagement arrangement lessens the load on the motor dur
with the head 96’, again rocking the lever 2| and ing slow downward feed, when the ?y cutter 92
is operating, in comparison to its load under the
disengaging the latch2|| from the stud 2, permit
ting the control handle 52 to drop to its ‘neutral old arrangement. I attribute this to the fact 70
that the gear 10 and'nut 16, both turning in the
position, where it is heldby-a spring 59 (see Fig
ure
7).
_
v
'
‘
.
-'-To control ,movementzof the handle 52 a ?nger
button 26 may be provided on the lever 2|, which
V75 maybe pressed upwardly-or downwardly to ac
same direction as the gear 1 and bearing there
upon to produce the downward movement of the
casing, are turning slightly slower than the gear
1, and the latter tends directly to pull the gear 7.5
2,122,072
lllf'and the ‘nut 16, around,‘by-this-frictional
action‘ relieving the gearing ofa' large partiof its
load, and lessening the friction of-the whole. It
has‘lbeen observed that this result occurs, and
ating" clutch ‘elements, movable in one direction
from'a neutral'position to place the :clutch sleeve
in" clutcheen'gaged position‘ for downward feed,
this lessens wear and the motor load, vhence
lengthens the life and reliabilityfof the entire
neutral :position to engage the cooperating ‘clutch
boring bar. With the arrangement of my prior
patent the ‘differential gear and Print, rotating
more rapidly than the main driving gear and
10 screw, and about a screw which was‘ left-handed,
tended to wedge the nut more tightly between
the incline of the screw thread and the driving
‘gear, thus producing more friction than in‘ the
present arrangement, hence a greater load on the
1:5 motor at a time when its maximum load‘ was
imposed.
~
~
'
‘
'
"
'
'
I
What I claim as my invention is: '
1. In a reboring machine, in combination with
a base, a boring bar vertically/‘reciprocable in the
20 base, and terminating at'its upper-end‘i'n a head
constituting a- gear casing, a power-driven screw
journaled in ‘the base and extending through ‘the
head,'a nut threaded thereon, two differential
gears, one constituting a driving ‘gear and keyed
to the screw, and the other loose thereon, a‘ com
mon gear in mesh with each ‘differential gear, a
gear-toothed sleeve slidable along‘ and keyed to
rotate with the nut, a set of comp-lemental clutch
elements, one part on the‘loose gear and one part
"30 on the sleeve, engageable by ‘downward- move
ment of said slidable sleeve’ to' advance the‘bor
ing'bar slowly downward, a‘ pair'of‘gears' of un
equal diameter in mesh respectively with the
driving gear and the sleeve’s gear teeth, “a sec
355 ond ‘set of complemental clutch ‘elements on‘ the
unequal gears engageable when said sleeve is
shifted upwardly, to rotate the nut at a different
speed and in a di?erent direction relative to‘ the
screw, thereby to eifect upward movement‘ of the
boring-bar, a control handle shiftable- upwardly
or downwardly from a neutral position to control
upward or downward shifting of the sleeve‘, and
therebylthe engagement of the respective clutch
elements, a third set of clutch elements,-'one' part
~ formed on the sleeve, the other part‘being ?xedly
commonto ithe'clutch'sleeve and to the cooper
and. movable in the opposite direction from such
elements,i*thereby to effect upward feed of the
boringban'.
:
M
-
w
3. In Ia'reboring machine, in’ combination with
a base, a boring bar vVerticallyreciprocable in 10
‘saidibase, a ‘power driven screw parallel to the
boring bar, a'driving gear carried by the boring
bar and keyed-‘to and. movable axially along said
screw, a differential gearvcoaxial with the'driving
gear and‘ having a greater number of teeth, an 15
idler gear meshing with the driving and differen
tial gears, whereby the former gains on the latter,
a nut'threaded on‘ said screw, a clutch sleeve slid
alole on and connected to rotate with said nut,
cooperative clutch‘elements formed on the clutch 20
sleeve and diiferential gear, the screw having
such vdirection of thread and rotating in such
direction that, when said clutch elements are
engaged, the nut‘ ‘feeds the boring bar slowly
downward, gear teeth formed on'the clutch sleeve, 25
of less diameter than ‘the driving gear,'a pair of
unequal coaxial ‘gears, the smaller one meshing
with‘ the driving gear and the larger one with
the sleeve‘ gear, cooperating clutch elements to
connect said pair of gears, whereby, when they
are engaged,lto rotate the nut relatively to the
screw in a direction to feed the boring bar rapidly
upward, and‘ selective means movable from a neu
tral position-to engagethe clutch sleeve with the
differential gear‘ or‘ alternatively to'eng'age the
two aligned gears, thereby to control the direc
tion of feed‘ of the boring bar.
‘
4. In a reboring machine, in combination" with
a base,'a boring bar vertically reciprocable in
the base, power means for'e?ecting such recipro 40
cation, including’a drive shaft and a clutch gear
shiftab'le to effect slow feed downward, a second
clutch'gear"meshed'with said ?rst clutch gear
and shiftable' to effect upward feed, drive means
connecting each of said clutch gears,"-in clutch- A
positioned, the two parts being engageable to
stop‘rotation of the nut, and to e?fe'ct rapid down
ward: movement of the boring bar," the last-men
,ro'ckJshaft'interengaged between said two clutch
tioned clutch elements on the sleeve being dis
said downward feed clutch gear from a neutral -
posed,‘relative to the ?xedly positioned clutch
element, to be engaged only when the sleeve and
its‘ otherclutch elements are in neutralposition,
thereby to interdict engagement of the last'set of
‘clutch elements except when‘the'other' two- sets
of clutch elements ‘are in neutral position. ' '
2. In a reboring machine, in combination with
a- ‘base; a boring bar vertically reciprocable vin
said base, power feed mechanism operatively con
nected to the boring bar to effect’suchreciproca
T10 tion‘ including a continuously rotating driving
gear, a clutch sleeve operatively connected at all
times to thefeed mechanism for rotation" there
with, and movable to and from clutch-engaged
position, means operable to e?ect downward feed
of ‘the boring bar when'the clutch sleeve'is in
such position, a gear formed'on said clutch sleeve,
of a diameter di?'erent from that of the driving
gear, two‘differently sized, axially aligned ‘gears
meshing with the driving gear and with‘ the
clutch
sleeve
gear,
respectively; ‘ cooperating
clutchv elements to connect said aligned'gears,
yieldable means normally holding said clutch ele.-,
'ments disengaged, means operable by such'en
gagement ofthe said clutch elements to ‘effect up
ward feed of the. boring bar, and control means
engaged position, with said drive shaft, and a
gears,v and‘ oscillatable'in one direction to move
position, wherein neither clutch gear is operative, 150
into-bar driving position, said upward feed clutch
gear remaining in neutral position, and oscillat
able in the opposite direction to move conjointly
and simultaneously said downwardv feed'clut'ch
gear into neutral position and said upward feed
clutch ‘gear into bar driving position.
5; In a reboring machine, in combination with
a base, a boring bar vertically reciprocable in
‘the base,‘and having a nonrotatable head, power
means including two rotatable clutch elements, a
control element shiftable from a neutral position
into 'either' of two clutch-engaged positions for
rotation by one or the other of said clutch’ ele
ments, thus to effect l'either slow downward feed
or upward feed of ‘the boring bar, and a locking '
member ?xed in position on said non'rotatable
head and ‘movable into locking engagement with
said control member only when the control ele
ment and the parts controlled thereby are in neu
‘tral' position, ‘to hold said control member from
rotation, thus to effect rapid downward
ment of the head.
7
move
,
' v6. In a reboring machine, in ‘combination with
a base, a'boring bar vertically reciprocable'in
the base, power means. for e?ecting such recip- r75
5
12,122,072
‘ ,rocation, including a clutch gear s‘hiftable to
and said nut to effect rotation of the nut at a
,eifectlow' speed downward, a second clutch gear
meshed with said-?rst'clutch gear and shiftable
to effect upward feed, a rock'shaftinterengaged
slower speed than said shaft and driving gear,
thus to effect movement of said driving gear
along said screw by pressure of the nut there
between said two clutch gears, and oscillatable
in one direction to move said downward feed
- 1 clutch gear from a neutral position into bar driv
ing position, and oscillatable in the opposite .di
'10
15
rection to move simultaneously said ‘downward
feed clutch gear into neutral position and said
.upward feed clutch gear into bar driving posi
tion, and means engageable by relative move
ment transversely of one of the aforementioned
clutch gears, only when both are in neutral posi
against.
'
10. In a reboring machine, in combination with
a base, a boring bar vertically reciprocable in the
base, and terminating at its upper end in a head
constituting a gear casing, a power-driven screw
journaled in the base and extending through the ‘ 10
head, a nut threaded thereon, two differential
gears, one constituting a driving gear and keyed
to the screw, and the other loose thereon, a com
‘mon gear in mesh with each differential gear, a
tion, to control them for effecting rapiddown
gear-toothed sleeve slidable along and keyed to 15
ward'movement of the boring bar.
rotate with the nut, a set of complemental clutch
elements, one part on the loose gear and one
‘ '7 .~ In a'reboring machine, in combination with
a base, a boring bar vertically reciprocable in
the base, and carrying a head constituting a gear
20 casing upon its upper end, power means for ef
fecting such reciprocation including a threaded
shaft extending through said head, parallel to
the boring bar, a nut threaded on said shaft, a
driving gear keyed to the shaft, a differential
25 gear loose on the shaft, and a common gear
I meshing with both said gears, and means to
clutch the differential gear to the nut to effect
differential rotation ‘of the nut and threaded
shaft, said clutch means being movable into neu
30 tral position, the driving gear having an exten
sion engageable with the nut, the parts being so
arranged, rotated, and disposed that in such neu
tral position the nut abuts said extension, which
rotates with the shaft, on the side thereof to
35 ward which the nut tends to travel along the
screw when held from rotation therewith, retar
dation in the nut’s rotation thus tending to jam
the nut against said element, whereby the nut
increasingly tends to rotate at precisely the same
speed as the threaded shaft.
8. ,In a reboring machine, in combination with
a base, a' boring bar vertically reciprocable in
the base, and carrying a head constituting a
gear casing upon its upper end, a threaded shaft
45 extending through the said head and rotatable
to effect reciprocation of the boring bar, a nut
threaded on said shaft, and movable forward
therealong as the shaft rotates while the nut is
' held from rotation or rotates at a speed slower
50 than said shaft, a member keyed to rotate with
said shaft and frictionally abutting the forward
side of said nut, tending normally to increase its
speed of rotation to equal that of said shaft as
the nut moves forward along the bar to press
55 against said member, thus to check the forward
movement of the nut, and means operable at will
to effect positive relative rotation of the screw
and nut to move said nut and said keyed member
along the screw, thus to reciprocate the boring
60 bar.
9. In a reboring machine, in combination with
a base, a boring bar vertically‘reciprocable in the
base, and carrying a head constituting a gear
casing upon its upper end, a right-hand threaded
vertical shaft journaled in the base and extend
ing through the head, a nut threaded on said
shaft, power means to rotate said shaft in a di- .
rection to move said nut downward along the
shaft when the nut is held from rotation or ro
70 tates at a speed slower than said shaft, a driving
gear keyed upon and rotating with said shaft, and
disposed immediately below and frictionally abut
ting said nut, tending normally to rotate the nut
therewith at the same speed as said shaft, and
75 means interconnectable between said driving gear
part on the sleeve, engageable by lengthwise
>movem'ent of the sleeve in one direction to ad- ‘
Vance the boring bar in a downward direction,‘ 20
a pair of unequal gears meshing respectively with
the driving gear and with the sleeve’s gear teeth,
a second set of complemental clutch elements
movable to connect or to disconnect the unequal
gears, whereby to rotate the nut in a different di 25
rection relative to the screw, when the latter
clutch elements are connected, and to effect ad
vance of the boring bar in the opposite direction,
and means controlling the engagement of the two
sets of clutch elements, to interdict engagement of 30
either set while the other set is engaged.
11. In a reboring machine, in combination
with a base, a boring bar vertically reciprocable in
the base, and terminating at its upper end in a
head constituting a gear casing, a power-driv 85
en screw journaled in the base and extending
through the head, a nut threaded thereon, two
differential gears, one constituting a driving gear
and keyed to the screw, and the other loose there
on, a common gear in mesh with each differential 40
gear, a gear-toothed sleeve slidable along and
keyed to rotate with the nut, a set of comple
mental clutch elements, one part on the loose gear
and one part on the sleeve, engageable by length
wise movement of the sleeve in one direction to 45
advance the boring bar in a downward direction,
a pair of unequal gears meshing respectively with
the driving gear and with the sleeve’s gear teeth,
a second set of complemental clutch elements
movable to connect or to disconnect the unequal
gears, whereby to rotate the nut in a different di 50
rection relative to the screw, when the latter
clutch elements are connected, and to effect ad
vance of the boring bar in the opposite direction,
means controlling the engagement of the two
sets of clutch elements, to interdict engagement 55
of either set while the other set is engaged, and
a third set of clutch elements, one part formed
on the sleeve and the other part being ?xedly po
sitioned, and when engaged stopping rotation of
the nut, to effect rapid feeding movement of the 60
boring bar, the last-mentioned clutch elements
on the sleeve being disposed, relative to the other
two sets of clutch elements and the means con
trolling the same, to be engaged only when the
other two sets of clutch elements are in neutral 65
position.
12. In a reboring machine, in combination with
a base, a boring bar vertically reciprocable in the
base, and terminating at its upper end in a head
constituting a gear casing, a power driven screw 70
journaled in the base and extending through the
head, a nut threaded thereon and held in said
head, three sets of clutch elements, each set in
cluding one part operatively connected to the nut
to rotate therewith, and a complemental part en 75
gageable with its ?rst part, means operable by
engagement of one such set of clutch elements to
ing uponlits upper‘ end,1a threaded vertical shaft
tjournaled'intthe' base and: extending through‘ the
e?ect slow relative upward feed of thenut along
the screw, thereby-to e?ect slow downward feed
head; a .nutthreaded on’ said ‘shaft,v power means
:t-o.rotate said shaft-in a direction to move said
of the boring bar, means operable by engagement
=nut ‘downward along the shaft when the nut is
.of a second such-set of clutch elements to effect
relative downward feed of the ‘nut along the
screw, thereby to effect upward feed of the boring
bar, and means operable by engagement of the
10 third such set of clutch elements to‘ effect rapid
relative upward feed of the nut along the screw,
thereby to effect rapid downward feed of the bor
ing bar.
13. The combination of claim 12, including also
15 means controlling the engagement of the several
sets of clutch elements, and interdicting engage
ment of any other set while any given set is in
engagement.
14. In a reboring machine, in combination with
20 a base, a boring bar vertically reciprocable in the
base, and carrying a head constituting a gear cas
held from rotation or rotates in the same direc
tion at a speed-slower than said shaft, a member
constituting part of said power means keyed upon
and-rotating with said shaft, and disposed imme
diately vbeneath and frictionally abutting said,
nut, tending normally tov jam against the nut for
rotation ‘of the two jammed-together elements
at-precisely/ the same speed and in the'same di
rection as the shaft, and clutch means inter
iconnectable between said power means and the -_15
nut to effect rotation of the nut at a slower speed
than said shaft and said keyed member, thus to
e?‘ect'movement-of said keyed member along said
shaft by pressure of the nut thereagainst.
CLARENCE T. ROTTLER.
u20
Документ
Категория
Без категории
Просмотров
0
Размер файла
1 168 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа