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Патент USA US2132088

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Oct. 4, 1938.
J. E. TORBERT. JR
'
2,132,088
SPEED CHANGING MECHANISM
Original Filed March 4, 1936
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2 Sheets-Sheet l
I Swumm
1 2 Join E. Ybr?efigeff.
Oct. 4, 1938.
'
J. E. TORBERT, JR
2,132,088
SPEED CHANGING MECHANISM
Original Filed March 4, 1936
,
2 Sheets-Sheet 2
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JoAn Z’. Tbrberi?]:
Patented Oct. 4, 1938
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UNITED STATES PATENT OFFICE *
2,132,088
SPEED CHANGING MECHANISM
John E. Torbert, Jr., National City, Calif.
Original application March 4, 1936, Serial No.
67,146. Divided and this application Septem
ber 10, 1936, Serial No. 100,183
3 Claims.
This invention relates to an improved speed
changing mechanism particularly adapted for use
with electric drill tools and the like and is a
division of my co-pending application for a patent
5 for a Drill, Serial No. 67,146, ?led March 1l, 1936;
now Patent No. 2,106,937.
One object of my invention is to‘ provide a
speed changing mechanism which will permit the
drill chuck of ‘an electric drill or the like to be
10 driven at either high or low speed, depending
upon the work to be drilled, so that the necessity
of the operator removing his hand from the
handle of the device to effect speed changes at
remote points will be obviated. "
Another object'of the invention is to provide a
device of this character which will be simple in
construction, light in weight, and positive in
action.
A further object of the invention is to provide
15
:a speed changing mechanism wherein provision
2 O is maderfor turning off or on the motor employed
(Cl. 77—7)
lower portion ' provided with an opening‘ inter
mediatev its length for permitting the establish
ment of communicationwith the handle which is
hollow throughout its interior, and in this bore
there is ?tted a tubular shaft housing 4, held in
place and prevented from rotating by set screws
5. Bearings 6 and ‘l are rotatably mounted in the
shaft housing to support a shaft 8 which termi
nates at its forward end in a head or ~nipple 9
formed with a squared shank i0 adapted to cor 10'
respond to a socket formed in a like shank on a
drill chuck which is adapted to be screwed on
the projecting threaded end portion H of the
shaft housing 4. Lock nuts l2, which are adapted
to lock the housing 4 in place, are carried by the
threaded portion ||. A beveled gear I 3 is ?xed
to the shaft 8 forwardly of the bearing l and is
adapted to mesh with a companion beveled gear
I4 which is carried by a shaft l5 rotatably
mounted in the handle I by hearing bars I6 ‘and
ll‘which extend transversely in the handle and
2'0
for driving the drive shaft of said mechanism.
Y are secured in place by screws l8. An' opening I91
A further object of the invention is to provide is formed in the‘tubular shaft housingll in order
2 UK
a speed changing mechanism wherein a remov
that the beveled gears |3 and I4 may have ready >.
able auxiliary handle is employed for permitting
meshing engagement with each other. Byv re;
fern'ng to Figure 2 of the drawings, it will be’
both hands of the operator to be used when it is
desired'to exert great pressure upon the work
being drilled.
30
Other and incidental objects of the'invention
will render themselves apparent as the descrip
tion' proceeds.
'
_
'My improved speed changing mechanism is il
lustrated in the accompanying drawings,
wherein:
35.»
'
Figure 1 is a vertical sectional view of the
seen that the shaft l5, which is better known as a
countershaft, is loosely received in clutch sleeves
28 and 2| which are journaled through the bear
ing bars I6 and M, respectively. Disposed on the
countershaft I5 and between the clutch sleeves, 30v
2E] and 2| is a clutch sleeve 22 which is-slidable
longitudinally on the countershaft but is held
against rotation thereon by a key 23. By shift
ing the clutch sleeve 22 longitudinally upon the
countershaft, it will be understood that selective 353
engagement of said'clutch sleeve 22'with either
of the clutch sleeves 2B or 2| may be had and,
looking in the direction indicated by the arrows. ‘ furthermore, by disposing the clutch sleeve 22,
40
Figure 3 is a transverse sectional View on the midway between the clutch sleeves 20 and 2|, 401
line‘3—3 of Figure 2.
rotation of the countershait may be brought to
Figure 4 is a fragmentary detail plan View a stop. Actuation of the shiftable clutch sleeve
22 is accomplished through the medium of a
showing the actuating button shank and open
structure;
Figure 2 is a vertical sectional view of the
mechanism, taken along the line 2—2 of Figure 1,
ing therefor.
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boss 24 having arms 25 which are engaged in a
circumferentially extending groove 26 formed ‘in
said shiftable clutch sleeve. The boss 24 projects
from a flat plate 21 which bears‘ against the inner
various views, the numeral | indicates in general , face of a detachable closure plate 28 carried by
a handle of my improved speed changing mecha
the handle I. In order to hold the plate 21
against the closure plate 28 I have provided
50 nism which carries at itsupper end a tubular
head 2 projecting upwardly and rearwardly there
resilient strips 29 which are carried by blocks
from. The handle de?nes a housing for the gear
38, which blocks projectv inwardly from the
ing employed, as will be seen hereinafter. The closure plate 28.
rear end of the tubular head is closed by a
As best seen in Figure 3 of the drawings, teeth
3| project from the resilient strips 29 to engage, 557
55 threaded plug _3. The bore of the head 2 has its
Referring now more particularly to the draw
ings, wherein like numerals of reference will be
seen to designate similar parts throughout the
2,132,088
in grooves 32 formed in the plate 21 and which
are adapted to guide sliding movement of said
plate. Attention is directed to the fact that when
mounted in the wall 46 of the handle I, where
it is secured in place by a set screw 55. From the
terminal socket 53 extend conductor wires 56
the teeth 3| are out of the grooves 32, as shown
which lead upwardly through the handle I and
in Figure 3, the resilient strips 29 will apply
pressure to the plate 21 and hold it ?rmly against
are attached to contacts 51, carried by a block
of insulation 58, which is mounted in the inner
the inner face of the closure plate 28 to prevent
the escape of lubricant .with which, the hollow
handle is ?lled, through an opening 33 formed in
10 said closure plate substantially medially thereof.
The opening 33 extends longitudinally of the 0105-.
ure plate and has lateral recesses or extensions
34 and 35, at its opposite ends, which, extensions
serve as seats for the shank 36 of the actuating
15 button 31. The button 31 terminates in a stem
or shank which is tightly screwed. into a socket
formed in the plate and the shank of the boss
24 and, referring to Figure 4 of the drawings, it
will be readily seen that by grasping the button
wall of a socket 59 formed at the rear of a
trigger guard 63 which trigger guardprojects .
forwardly from the handle I under the head 2.
In the guard there is mounted a trigger 6| which
is pivoted at its upper end, as shown at 62, and
carries a lug 63 for shifting the arm 64 inwardly
against the action of a spring for bridging the
contacts 51 when pressure is applied to the trig
15
It will thus be seen that an operator, grasping
the handle i, may easily pass a ?nger through
the trigger guard and, by applying pressure to
the trigger, close a circuit for setting in opera
tion the motor’ connected to a source of power 20
20 31 the shank 36 thereof may be shifted longi
tudinally of the opening 33 in either direction for and to the contacts 51. When the trigger is re
leased, the circuit will be broken by reason of the
shifting the clutch sleeve 22 from a neutralrposi
tion, as shown .in Figures, 1 and 2, ‘to an opera-.. fact that the spring 65 will urge the arm 64 out-v
wardly out of engagement with the contacts 51.
tive position, in which position it will have oper
In some instances, it will be desirable to hold 25:.
25 ative engagement with the clutch sleeve 2|! or the
the drill in both hands so that it may be held
clutch sleeve '2 I , according to the direction in
which the button 31 is moved. When the button very easily and so that more pressure may be ap
~ reaches either end'eof the opening 33, it will be plied if necessary. Therefore, in order to accoma
moved laterally into either the recess 34 or the , plish this, I provide an auxiliary handle indicated
30 recess 35, according to the direction in which it in general by the numeral 66 and which includes 30'
has-been shifted, and the shiftable clutch sleeve a relatively short metalbar 61 having a threaded
will thus be. ?rmly held in a set position and end portion 68 adapted to be screwed into the
rotary motion willv be imparted to the shaft l5 socket 59 of a yoke 19. The arms 1| and 12 of
either by the clutch sleeve 26 or the clutch sleeve the yoke diverge from the socket 69 so that they . '
will have ?at contacting engagement with-the 35
2|. The clutch sleeve ZOis formed'with a cir
cumferentially extending spur gear 38 which beveled side faces of a saddle'13 which is formed
meshes with a companion gear 39 carried by a integral with the head 2 by thickeningthe inter-v
mediate portion of said head. As best seen in . '
shaft 40. As best seen in Figure 1 of, the draw
Figure 2 of the drawings, this saddle projects
ings, the shaft 40 is- journaled through the hear
from opposite sides of the headto form shoulders 40
40 ing bars l6 and I1 and has its rear end ter~
minating in_ a socket 4| vadapted to receive the andv the free, or lower end portions of the-arms '
shank 42 of a ?exible shaft 43 when the cable 44 ' 1| and 12 are bent to form hooks 14 which engage
of said flexible shaft is screwed into a threaded under the shoulders ofthe' saddle. It will also
socket 45 which is formed in the thickened lower . be seen in Figure 2,.that when the handleGB is
endwall 46 of the hollow handle I. It will be screwed into the socket 69,'the innerend of said 4,5
handle will engage the upper face'of the: saddle
" understood that the shaft '40 rotates at the
same rate of speed as the flexible shaft 43 and, and Will exert a pull upon the arms 1| and 12 of
as the clutch 2|] turns at thesame rate of speed the yoke and cause their hooked ends tobe'
as the gear 39, rotary‘ motion at a ‘high speed moved into tight binding engagement with the
will
be transmitted to the shaft I5 and thus to shoulders of , the saddle. The handle will ‘thus 50,
50?
the‘shaft 8 when the shiftable clutch sleeve is in. be ?rmly held in place on the saddle andthe »'
operator may grasp the handle 66 with onehand
engagement with the clutch sleeve 23.
and the handle | with the other hand so‘ that
The countershaft l5 will be rotated at a re
the entire mechanism may be held very easily
duced speedwhen the clutch sleeve 22 is in en
‘
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' " '
55.
55 gagement with the clutch sleeve 2 I, as the clutch when in use.
sleeve 2| ‘carries, at its rear‘ end, a beveled pinion
When the auxiliary handle is not needed, it' is ' >
41 which meshes with a companion beveled only necessary to rotate the metal bar 61 thereof
pinion 43 carrie'd'by a Worm gear 49, the Worm in a direction to loosen it, so that the'hooked ends 1 I
gear being rotatably mounted and having the 14 will be freed from binding engagementwith
60 stem ‘55 thereof journaled in a block‘ 5| which the saddle. The yoke may be shifted longitudi 60:
projects rearwardly or downwardly from the bear
nally of the saddle out of engagement therewith '
ing bar l1 integral therewith. The marginal so that the auxiliary handle may be laid aside
teeth of the worm gear 49 are disposed in mesh
until again needed.
ing engagement with'threads of the worm 52
It is thought that a reading of the foregoing“
65 which is carried on and ?xed to rotate with the description will disclose that I have provided a 65
shaft 40. It will thus. be seen that a drill may be simple yet highly efficient speed changing mech-i "
operated either at high speed or at low speed, anism.
according to the type of materialin which an
Having thus described the invention, what I"
opening is to be drilled. ‘It will further be under— claim is:
"
"
'
1. In a speed changing mechanism, a’ handle 70
70 1 stood that the actuating button 31 may be quickly
shifted for controlling the speed or completely de?ning a housing, a head carried by the ‘handle
stopping rotation without the necessity of the and having a bore, a tubular'shaft housing in the
~ operator removing his hand from the handle I of
bore, a shaft in the housing, a countershaft in'
the tool. -‘ A ‘terminal socket 53, to receive the the handle, means rotatably mounting the coun-7 ‘
prongs of an electric connecting plug 54, is tershaft in said handle, clutchsleeves rotatably"
ger.
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3
2,132,088
mounted on said countershaft, a movable clutch
sleeve slidable on the countershaft and ?xed to
rotate therewith, means carried by the handle
for shifting the movable clutch sleeve, a drive
shaft carried by the 'handle, a ?exible shaft
operatively connected with the drive shaft, a
worm carried by the drive shaft near its lower
end, a gear carried by the shaft at its upper end,
a gear carried by one of the clutch sleeves and
10 adapted to engage said ?rst mentioned gear,
means rotatably connecting the worm with the
other of said clutch sleeves, and means for im
parting rotation from the countershaft to the
?rst mentioned shaft, said movable clutch sleeve
15 being adapted for connecting the countershaft to
one of said clutch sleeves for relatively slow ro
tative movement or to the other of said clutch
sleeves for relatively fast rotative movement.
2. In a speed changing mechanism, a handle
20 de?ning a housing, a head carried thereby and
having a saddle, an auxiliary handle associated
with the head and having a relatively short bar
terminating in a threaded end portion, and a
yoke having arms straddling the saddle and ter
25 minating in hooks adapted to engage the saddle,
said short bar being adapted to be screwed into
de?ning a housing, a head formed thereon and
having a bore, a shaft housing carried by the
bore, a shaft rotatable in the bore, bearings
journaling the shaft in the bore, a countershaft
carried by the handle, beveled gears for trans Cl
mitting rotation from the countershaft to said
?rst mentioned shaft, clutch sleeves rotatably
mounted on the countershaft and having gears
thereon, a movable clutch sleeve slidable longi
tudinally on the countershaft and ?xed to rotate
therewith, means carried by the handle for shift
ing the movable clutch sleeve, a drive shaft, a
?exible shaft exteriorly of the handle and oper
atively connected with the drive shaft, a gear
carried by the drive shaft and adapted to mesh
with a gear of one of the clutch sleeves for
transmitting high speed rotation to said clutch
member, a worm carried by said drive shaft
for transmitting low speed rotation to the other '
of said clutch sleeves, and bearing bars carried 20
within the handle for mounting said shafts and
sleeves, said movable clutch sleeve in one posi
tion being adapted to transmit relatively’ slow
rotative movement to the ?rst mentioned shaft
and in another position to transmit relatively 25
high speed rotative movement to said ?rst men
the yoke for tightening the hooks against the
tioned shaft and said movable clutch sleeve being
saddle and retaining the auxiliary handle on the
head and said bar being rotatable for releasing
shiftable to an intermediate position for retain
30 the auxiliary handle from the head.
ing the countershaft in a non-rotating position.
~
3. In a speed changing mechanism, a handle
30
JOHN E. TORBERT, JR.
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