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Патент USA US2105288

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Jan. 11, 1938.
‘ ‘
Filed May 22, 1935
5 Sheets-Sheet l
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Ms. M
Jan. 1 l, 1938.
Filed May 22, 1935
5 Sheets-Sheet‘ 2
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V M 51 M
Jan. 11, 1938.
Filed May 22, 1955
5 Sheets-Sheet
Jan. 11, 1938.
Filed May 22, 1955
5 Sheets-Sheet 4 '
Jan. 11, 1938.
Filed May 22, 19.35
5 Sheets-Sheetv 5
490 (s P/NDLE
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1200 ‘SP/N046
mm W2
Patented Jan. .11, 1938
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Carl E. Linden,_Norwood, and Raymond H. Mc
Clellan, Hamilton, Ohio", assignors to The Fos
dick Machine Tool Company, ‘Cincinnati, Ohio,
a corporation of Ohio
‘Application May 22, 1935,.Serial ‘No. 221,794
5 Claims.‘ (cite-477)
This invention relates to improvements in speed Fig. 3, further detailing the transmission and the
control devices, and is particularly directed to a back gear shifting device.
n :10 be automatically controlled by means of a single
Figure 5 is‘ a- sectional view taken on line 5-5,
Fig. 2, detailing the control lever operating con
nection to the switch and gear shifting shaft.
Figure 6 is‘a sectional View taken on line 6—6,
Fig. 3, illustrating the details of the back gear
shifting. mechanism and the positioning detents
for the controller.
Figure '7. is a sectional view taken on line 1-1,
v ‘ lever, the usual range of speedsof the motor ‘being,
Fig. 6, further detailing the shifting mechanism.
.» motor driven gear transmission for use in‘ driv
> :ing drillspindles or the like.
It is the object of this invention to provide-an
electric motor driven transmission by means of
‘which a wide range of speeds can be provided; in
l which the speeds‘imparted to the driven part
> through motor speed control and gear shifts may
j’automatically. multiplied ‘through the common
lever; and in which the shifting of gears in con
Figure 8 is a sectional View taken on line 8-8,'
> Fig. 4, showing vthe details of the back gear sup
junction with the operation of the speed control
port element.
means for theielectric motor is accomplished ' >=Figure 9 is a diagrammatic View illustrating the‘
without. clashing of the gears ‘by control appara
relation ofthe back gear shifting device and the
tus slowing down the motor as the gear shifts are ' controller switch for the motor showing the dial
and lever’ in appropriate position and the back
‘ With these objectives in mind, the present em
gear shift occurring.
mo bodiment of the invention may include a multiple ’
a» or .variable speed controller for the motor, a gear
~ transmission between the motor and the‘part be
Figure 10 isa view similar to Figure 9, but
showing direct drive connection.
Figure 11 is a detailed View of a modi?ed form
ing driven, and a single lever controlling the motor ' of control lever, showing the same associated with
speed controller'and the gear shift, whereby the
the dial.‘
:Figure 12‘is a wiring diagram showing the motor
27.35‘; speeds obtained in the driven part are in sequence
.. as to rate, and are controlled from one lever. The windings, the ‘switch contacts and the wiring
"improved constructionlcan be applied so as to ~
Figure 13 is a diagram showing the contacts of
' multiply the velectric motor speeds any number
of times through appropriate gear shifts inter a the switch and illustrating by legends the motor
connected or operated mechanically ‘with the and spindle speeds and the range of the back
l-operation of themotor controller for raising o-r gear shift._ ..
lowering the speeds of the motor upon each'gear , > For the purpose of illustration, the improve
shift always delivering the‘motor speed in'the . ments-conjcerned in this application have been ap
samesequence as to rate. In other Words, the ‘ plied to ‘a drill of the following construction. A
motor selected may be capable of operation, for column I5 islmounted on a base 16 and carries
example, atfour different speeds, which speeds apower transmission head ll at its upper end
and a drill'head unit l8 slidably supported on
~missionwhich may step the motor speed range: the forward side of-the column on vertical ways
[9. A work supporting table 20 is suitably mount
up or. down as the case may be, but which will
£1.40 always deliver the ranges of motor ‘speed so that‘ ,ed' on the column and the base directly be
neath the head l8. Suitable means are pro
‘.the ultimate speeds at the driven part are con
- are delivered to the driven part through a trans
stantly increased or decreased in rate. I
Other objects and further advantages will, be
, morev fullyqapparent from a description of the
vided for adjustably supporting the head and
for feeding the same vertically on the column.
. _
The toolspindle 2|,vertically downwardly dis
posed from the head, is driven by meansof a
‘accompanying drawings, in which:
Figure 1' is aperspective-view of a drill in-_. shaft 22 extended upwardly from the spindle and
corporating the present improvements.
thehead and having splined connection with the
. ,..Figure ,2‘. is an enlarged top plan view of the transmission in ‘the head at the top of the column.
. drill, a portion thereof being broken away for the ‘ All of-the-lpresent improvements relate tothe
1150 purpose of showing the connection‘of thecon
motordriven, transmission for the spindle driv- “
ing shaft 22 and accordinglythe detailed descrip
.' , Figure‘ 3“ is a sectional view taken on line 3-3, tionhwill be con?ned to the structure at the top
;-;Fig. 2, detailing the drive transmission from the '. of the column.
' El‘lie transmission head casing structure in
‘ motor to the spindle shaft.
:55 . Figure 4 is a sectional view taken on line 4‘—ll, , corporates three chambers, namely, a transmis 55
.atrol shaft to themotor controller switch shaft.
sion casing or chamber 23, a motor chamber cas
ing 24, and a controller switch chamber 25. As
shown, in Figures 2 and 3, the motor chamber
24 is extended upwardly from the transmission
chamber 23 and the controller switch chamber 25
is extended rearwardly from the transmission
In general, the structures embodied in these
three casings is as follows: A motor 26' in the
10 chamber 24 drives the shaft 22 either directly or
through back gearing. The motor speed is con
trolled by means of a switch Z'Ifhavingduplicate
sets of contacts in this embodiment. The speeds
of the motor as controlled‘ by the switch'may‘be
of any number and in this instance happen‘to be‘
four. The range of delivered speeds is doubled
by the use of the back gearing. A single lever 28
operates the controller switch‘and-thelback-gear
ing shiftable gears for the purpose_ of setting
20 up twice the number of motor speeds, namely,
‘eight in thefpresent instance. One Fcomplete
swing of the lever moves the 'control mechanism
through eightif delivered speeds. ~.Inldoing>so it
rotates the controller ‘switch once, operating the
25 backgear for shifting from direct’drive 'to‘ back
gearing drive between the sets of "contacts of the
' switch.
It is alsoprovided by arrangementon
the controller switch that‘prior to or at the time
of meshing or shifting from-back geardrive to
directdrive, the motor speedis lowered’ soias to
. lessen clashing ofithe gears.
Speci?cally describing the structure heretofore
generally outlined,vthe motornis' vertically dis
This sleeve has a shiftable compound gear ele
ment 45 in splined connection with its upper end.
The compound gear incorporates an upper in
ternal gear 46, adapted to mesh with the driving
gear 33, and a lower spur gear 41 adapted to en
gage with a gear 48 of a second compound gear
or back gear element 49 suitably journalled in
the transmission'casing.
The other-gear 50 of
the back gear element 49 is in constant mesh
with the upper portion of the driving gear 33 so 10
~‘that the compound back gear element is being
'driven constantly while the motor is running.
The sleeve 42 is held in position against verti
cal'displacement on its bearings by means of a
.-:nut' 5| screwed on the lower end thereof against 15
“Ttheinner race of the lower bearing 43. This nut
draws abutment washers 52, 53, the ?rst of which
“lies onlthe upper surface of the inner race of the
upperbearing and is engaged by the second,
namely 53, disposed in an annular groove 54 in 20
‘ the sleeve tightly against thetop surface of ' the
bearing » 43. ‘The
upper' washer" 53 or the one ?xed in‘. the sleeve
serves as a support or stop for theshiftable com
pound gear‘ 45, limiting its downwardrmovementi?li
to perfectmesh with the back gear. Therefore it
will be understood that this shiftable compound
gear, as shown in thexpresent embodiment, has
two' positions, namely, upper or direct drive po
sition, or lower or. back. gear‘driveiposition. . Theoao
number of positions of course canbeincreased
as desired; The back gear49 is journalled in ball
bearings 54, 54,>suitably mounted in...the'trans
posed in its casing and has its lower‘ end (see mission housing.
Figure 3) journalled'in a ball bearing“ mounted
"Theyshiftable compound gear is operatedbyl‘i 35
in a bearing support element: 30 of .the transmis
means of a yoke arm- 55,: asza part.of:a s1ide156
"sion. casing. The motorshafti?l nis‘hollow for vertically slidably mounted in a' casingand: clos
the purpose of .telescopicalengagement; loosely ure element 51 of the transmission housing. .The
over the splined upper end 32201‘ the vtoolidrive - element" 51 includes a slideway 58xin. its. inner
- spindle shaft 1 22. The lower end of the motor
side for this purpose. This slideway is formed<in:
shaft carries a; driving .gear '33 .keyed Ythereto -a lug 59 projecting into the'housing. Thexslide
within thetransmission casing.
way includes overhanging ?anges andrmaybelde
A fan element) 34'isTkeyed to the .loweriiend of scribed as a T-slot as viewed in top plan-view.
the motor shaft within the motor housing,:.-this
The slide " 56 carrying the ‘yoke ‘has; ascross
fan element‘. forcingsair from-.the motor. housing ‘groove 60 in itslower end. A lever 6| pivoted on; :45
by centrifugal force-.through‘radialtubular arms a the closure element“ 51 has one end carrying: a
rotating in the plane of apertures_35. in the-mo
roller 621engaged in said cross slot: or grooveSO,
torLhousing 36.
‘ i
and its other end bifurcated to provide an operat
rThel-assembly of the gearzarid:‘fan,»»andlthe
~ 'ingi connection-as follows:
_mounting of. the lower end of theshaft'ionthe
A‘shaft 63 is mounted. horizontally through the‘; :50
transmission housing is accomplished 'in’i'the fol t transmission casing and has its extremeinner'end
lowing manner. A sealing sleeveh3'l-is ?xed on coupled; to the controller switch‘ shaft by acou
>~the >motor shaft between the fan elementuand . pling sleeve E54 (seeIFigureZ). .Its outer end is
the ball bearing. A nut 38 on thescrew¢threaded journalled. in .the closure element . 51 ‘passing
lower end of thermotor vshaft,~when drawn» up, lthroughthe casing portion thereof. This shaft‘ 55
" engages the'geari33 tightly against-the inner race ...'iS rotatedsbymeans of the .lever 28 hereinafter
> of the ball-bearing from beneath andithe fan 34 wdescribed'indetail. A back. gear operatingndisc
‘and sealing sleeve 31 against the upperside-of 66 is pinned tothe shaft adjacentthe/innerside
the. inner race of the ball bearing fromiabove, .iof the ‘slide element,wthisr.disc. carryingra roller
60 thus clamping all elements to the inner'race of
61 extended therefrom after .themanneriofali?o
> the ball bearing;
Thesealing sleeve includes a circular ?ange 39
~ having depending concentric'circular lugs-140 en
' gaged innannular grooves 4| in the horizontal top
wcrank pin. ‘This. roller is" ada-ptedutoiengagerin
the slotted or bifurcated end‘ of the-lever'?liupon
each: rotation of the 'disc, somewhat after‘ the
‘manner of a Geneva gear.
The; bifurcation or
~ surface of the bearing support sleeve.
slot in the end of the lever is widened‘ 1for'io1ear-51i5
~-As1wi1l_ be later described; but omitted from‘ the wance purposes so that entrance and departure of
a mechanical details, the motor is'-wired to-‘the con
the roller; 61 will be facilitated.
troller switch'for the appropriatespeedcontrolby
‘A look or gear support element 68 is/incor
connections to the two windings, for example; of ‘ lporated (see'Figure 8) for maintaining the shift
‘ the shell type induction motor used-herein.
The vertically disposed spindlei driving Ishaft
" able gear 45 in either upper'or lower position,“
particularly in'upper position~so that itiwillilnot
* 22 ‘has its’ splined upper end-‘in splined driving - fall under the-action of’ gravity. This element
connection with a sleeve 42, loosely rotatively-sup "extends from the hub oflthe'lever- and is adapted
ported on spacedball bearings~435 '43,"»?xed>‘in a
to engage the hub 69 ofjthe disc.
The'outer end
circular inner'lugiM‘bf-the: transmission casing. - of the lock v'element'eor arm is'of lt-he ‘following-‘£75
described on a radius very slightly greater than
device for accomplishing back gear shift‘more
than once during a given revolution.
In other words, the present invention contem
plates any number of mechanical gear changes
the radius of the hub of the disc for the purpose
of working clearance. The hub has a portion ‘I2
in connection with. a multi-speed electrical mo~
tor control with an electrical controller making
?attened immediately adjacent the operating
roller thereof. As shown in Figure 6, when the
slide operating the gear is at its‘ lowest position,
10 the lower of the arcuate portions is engaged
a cycle of motor speed change for each gear shift,
that is to say, running through all its speeds each
‘shape. Arcuate surfaces ‘H1, ‘MI, are extended
from a ?at intermediate portion ‘II to the side
edges of the arm, these arcuate portions being
with the surface of the disc hub.
As the roller moves into the slot of the lever,
‘the ?at portion of the hub of the disc moves ad
jacent to the arcuate portion just mentioned,
15 thereby providing clearance and permitting ro
time a gear is shifted.
The motor control switch used herein controls
the motor for four speeds as shown in R. P. M.
from 450 to 1200. With the same speed of the
spindle repeating the cycle of speeds with the
back gear in mesh, spindle speeds of from 112
R. P. M. up to 300 R. P. M. (see Figure 11) are ob 15
Referring to Figure 12, the‘ motor controller
switch and motor are shown diagrammatically.
Three power lines are provided, 88, 89 and Si),
which power lines are connected to stationary 20
contacts til, 92 and 93, of the controller switch.
The motor incorporates two windings. The
switch provides duplicate sets of contacts for
whereby it is impossible for the shiftable gear the purpose of duplicating a range of four speeds
to drop until the operator moves the disc to place in one rotation of the controller representing 25
the ?attened portion opposite or adjacent to the . eight speeds on the dial as shown with interposed
gear change.
arcuate portion such as occurs'when reverse ro
The motor speeds are 450, 600, 900 and 1200 R.
tation of the disc is accomplished after a move
ment of the shift lever through the full range P. M. respectively. The ?rst set of motor speeds
are lowered to 112, 150, 225 and 300 R. P. M. re 30
of speed.
spectively at the spindle when the back gear is in,
The lever 28 which operates the back gear
shifting disc and the‘switch is suspended from but when the back gear is shifted the spindle
a pivot stud ‘I3 within the casing portion of the speeds are stepped up in direct drive to the same
speeds as the motor so that the increase in speed
slide element and at the upper end thereof. The
85 manipulating knob or arm portion it of the lever is uniform, ranging from 130 at the spindle to 35
1200 at the spindle.
depends downwardly through a slot ‘I5 in the
With the indicator set at 450 R. P. M., namely,
lower portion of the casing. The lever is‘‘ made
in two parts. The upper or pivoted part ‘it is motor speed, 112 R. P. M. spindle speed, the con
nections are as follows: Contacts 98, 92 and 93
in the form of a segmental gear having its gear
are in contact with rotating contacts as, 95 and .40
.teeth engaging a spur gear ‘I’! pinned on the
96 of the rotating switch element. These con
shaft, and the other or lower part ‘it is bolted
against the forward face of the ?rst element and tacts are in electrical connection with other con
tacts 9?, 98 and Q9 of the controller in longitu
includes an arcuate slot “It having its curve gen
erated on the axis of the pivot of the lever and dinal alignment therewith. These latter con
of a width ?tting the hub 89' of the spur gear. tacts are in engagement with stationary con 4.5
This slot is of a length sui?cient to permit one tacts HID, IiiI and I62 of the switch, which con
full rotation of the disc and to limit movement tacts have motor leads IE3, IE4 and Iiiii extend
ed therefrom to a winding I06 of the motor.
of the lever to one full rotation.
These windings are delta connected. The last
The extreme outer end of the shaft carries an
mentioned connections are tapped or partial - 50
I50 indicator ?nger 3i moving in relation to appro
delta to- provide a low motor speed. All the con
priate indicia 82 on the edges of a circular boss
nections of the other winding’ It? are open,
83 on the forward face of the cover plate 3d of
whereas leads I08, I09, lit and HI of the ?rst
the casing. In the present arrangement pro
vision is made for eight positions. This however mentioned winding E06 are connected through
55 can be modi?ed to meet various demands. All stationary contacts H2, H3, IM and H5, mov
of these positions are de?nitely located with ease ing contacts H6, H1, H8 and H9, connections
I29, HI and I22, and‘intermediate lead I23.
by the operator, not only by noting the indica
Moving the controller one step up to the second
‘tor ?nger but through the aid of detent grooves
85 in the disc engaged by a detent plunger ball speed, the motor speed is increased to 600 R. P. M.
60 86 disposed in a lug 8? of the closure or casing and spindle speed to 150 R. P. M. At this posi 60
tion, as will be apparent, the moving contacts
element 51. The shift or control lever 28 may be
are, 125 and IE6 then engage the stationary power
on the outer end of the controller shaft {53 as
input contacts 99, 92 and 93. Leads Iiil, I28 and
shown in Figure 11 if desired.
IE9 of the switch connect these last mentioned
The disengaged or intermediate position of the
contacts to moving contacts I30, IEI and I32, 65
shiftable gear 45 ?nds the shift lever and shaft which contacts then engage stationary contacts
with the switch in position where the motor is
I 33, I34 and I35 of the switch. These last men
being controlled for automatically slowing down tioned contacts are connected to the other wind
the same so as to lessen. slashing of gears as they
ing Iil‘I of the motor in tapped or partial delta
70 are engaged. The connection between the gear connections by motor leads I 36, E31 and I33 70
shifting slide and the operating shaft is shown respectively, this winding being suitable for pro
as a form of Geneva movement, but it will be
viding a faster speed. All the connections of the
observed that it can take other forms such as
other‘ winding are then open, whereas the other
intermittent gearing. Also a multiple Geneva connections to winding I01, namely I39, M0, MI
and I42 are connected together through contacts 75
movement may be used. or any other suitable
tation of the lock element and swinging move“
ment of the lever under the in?uence of the
roller in the slot thereof. The lever swings to
move the shiftable gear to its upper position,
20 and as this upper position is reached the ?at
tened portion of the hub has passed. the lock ele
ment and the curve of the hub then engages the
upper arcuate portion of the lock element,
I43, I44, I45 and I46, connections I20, I2I and
I22 and interconnection I23.
Upon movement of the controller switch to
the next position, namely 3, 900 motor R. P. M.,
225 spindle R. P. M., the power input contacts
9|, 92 and 93 then are engaged by movable con
tacts I41, I48 and I49. These contacts are con
nected to other movable contacts I50, I5I, I 52 and
I 53, which latter contacts engage stationary con
10 tacts II2,,II3, H4 and H5, which contacts are
as described extended to the delta connections of
the winding I06 through the previously men
tioned leads I08, I09, H0 and III. At the same
time leads I03, I04 and I05 are open. All the
leads of the other winding are also open.
At the next position, namely 4, 1200 motor
R. P. M., 300 spindle R. P. M., the stationary in~
put contacts 9|, 92 and 93, are then engaged by
movable contacts I54, I55 and I56. These mov
able contacts are also connected to movable con
tacts I5'I, I58, I59 and I60 by the connections I21,
I28 and I29.
The last mentioned movable con
tacts engage stationary contacts IBI, I62, I03
and I64 respectively, which stationary contacts
extend to the delta connections of the winding I0'I
through leads I39, I40, MI and I42.
shaft to be rotated and a gear carrying yQke to
be slidably moved, a lever pivotally mounted,
said lever having one end operatively engaging
the gear carrying yoke and having its other end
bifurcated, a disc mounted on the shaft, said disc
carrying a crank pin element adapted to enter
said bifurcated end of the lever for shifting the
lever, a second disc mounted on the shaft, a
locking arm as a part of the lever having arcuate
surfaces engageable with the periphery of the 10
last-named disc, said last-named disc including
a ?attened portion on the same side of the shaft
as the crank pin adapted to clear the contact of
the last-named disc and the locking arm when the
lever is being shifted.
2. In a shifting device including a controller
shaft and a shifting lever, a disc mounted on the
shaft, said disc including means engageable with
one end of the lever at one portion of the rotation
of the disc for swinging the lever, a detent device 20
coactive with the periphery of the disc for locat
ing predetermined control positions of the con
troller shaft, and locking means for locking the
lever against swing when said means on the
disc is not engaging the lever.
3. In a shifting device including a controller
It will be observed that leads I36, I37 and I38 of - shaft and a shifting lever, a disc mounted on the
winding I 01 are open as well as all the leads of
shaft, said disc including means engageable with
winding I00. At this time the controller has one end of the lever at one portion of the rotation
been rotated 180° approximately. The other half
of the rotation will duplicate the motor speeds
just mentioned, but as the rotation reaches 180°,
the back gear shift is made coupling the motor
shaft direct to the spindle shaft, and the spindle
speeds are accordingly stepped up to motor speeds
as indicated. Accordingly, the movable contacts
wherever necessary are duplicated as will be ob
served by inspection of the spread out view of
the controller cylinder.
In order to lessen clashing of the gears as the
controller lever is moved to shift spindle speed
from 300 R. P. M. to 450R. P. M. (position 4 to 5)
of the disc for swinging the lever, a detent device 30
coactive with the periphery of the disc for locat
ing predetermined control positions of the con
troller shaft, and a locking device for maintain
ing the lever in positions at its limits of move
ment, said device including elements an the lever 35
and disc having curved surfaces rotatabiy nested
throughout most 01'' the movement of the disc,
said curved surfaces discontinued adjacent to the
means on the disc engageable with the lever for
permitting swinging of the lever.
4. A shifting device, comprising, a shaft, means
for rotating the shaft, a shifting lever pivotally
through the gear shift, the movable contacts
mounted, a disc having a crank pinthereon en
I30, I3I: I32, I40, I4I, I42, I43, I44, I45 and I46
gaging a bifurcated end of the lever for shifting
the lever, detent means cooperating with the i'45
45 are elongated so that they engage the contacts
9|, 92, 93, I00, IOI, I02, H2, H3, H4 and H5 at
the time the mechanical gear shift is being
initiated so that as the shiftable back gear reaches
the point of mesh with the driven gear of the
50' motor, the motor speed has been lowered to 450
R. P. M. lowest motor speed which is only slightly
higher than the 300 spindle speed existing at the
disc for holding it at any one of a series of pre
determined positions, interlocking elements on the
lever and disc nesting during rotation of the disc
relative to the lever for preventing swinging
movement of the lever, said elements shaped to 15b
discontinue nesting as the crank pin engages the
5. A shifting device, comprising, a shaft, means
time of the shift.
It will be apparent that any one of a number
of electrical devices may be used for lowering
the motor speed, for instance, a reverse plugging
contact to practically stop‘ the motor or in the
case of a D. C. motor, contacts causing dynamic
mounted, a disc having a crank pin thereon en
determined positions.
Having described our invention, we claim:
1. In a shifting device including a controller
for rotating the shaft, a shifting lever pivotally
gaging a bifurcated end of the lever for shifting
the lever, and detent means cooperating with the
disc for holding it at any one of a series of pre
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