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Патент USA US2137940

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, Nov,’ 22, 1938.
2,137,940 '
Filed March 2, 1936
\/.\ o\
2 Sheets-Sheet 1
Nov. 22, 1938.‘
Filed March 2, 1936
2 Sheets-Sheet 2
Fig.2 '
D ewey H. 6 0001mm
1(NVEN'1TOR. -
Patented Nov. 22, 1938
“ 2,137,9n
CHAIN paint
Dewey H.’ Goodman, "Iowa Park, Tex. .
Application March 2, 1936, *S'eria‘l No. ‘66,746
:4 Claims.
The invention relates to boring tools and aims
to provide a drill adapted to be power driven
and portableand of atype to be held to the work
the lower. end of the tube lu. A bit chuck is pro
vided at the‘ lower end of the bit stock and con
sists of ‘the usual tapered opening 1m to receive
driven from a distant point by an automobile or
the tapered shank of a bit l5. The drift rod 26
has a limited play in the drive shaft 1 and bit ‘1
stock and engages the shank of the bit IE to
‘other suitable and convenient source‘of power,
and which may be thrown into and1 out of ,a'ction
admit of releasing the bit by tapping upon the
upper projecting end of the drift. The lower
, __
at will, without stopping the motive‘ power? .
"portion of the bit stock lb has a loose fit in the I
The invention ‘furthermore provides a drill
which admits of . the bit being automatically
thrown into and out of action by the pressure
exerting means which, when applied, throws the
bit into action and which, when released, throws
the bit out of action.
A further purpose is the provision of a tool of
"by a chain or equivalent means.
The invention provides a tool that may be
the character aforesaid which allows changing
of the bit at any time, when the tool is at rest
or running, means being provided to release the
20 bit by tapping a drift or rod..
While the drawings illustrate a preferred em
bodiment of the invention, it is to be understood
that in adapting the same to meet speci?c needs
and requirements, the design may be varied and
25 changes in the minor details of construction may
be resorted to within the scope of the invention
as claimed, without departing from the spirit
For a full understanding of the invention and
30 the merits thereof, reference is to be had to the
following description and the drawings hereto
attached, in which:
Figure 1 is a View illustrative of an embodiment
of the invention driven by a motor vehicle.
Figure 2 is an enlarged detail sectional view
of the tool.
Figure 3 is a sectional detail on the line 3-3 of
Figure 2.
Figure 4 is a detail section on the line 4--4 of
40 Figure 2.
Figure 5 is a view similar to Figure 4, on the
line 5—-5 of Figure 2.
Corresponding and like parts are referred to
in the following description and designated in
45 the several views of the drawings by like reference
The tool embodies a frame consisting of a
hollow bodyr 6 closed at its top by a bonnet 6a
and at one side by a plate 6b. A drive shaft 1
50 is mounted in the frame and is formed with an
axial opening to receive a bit stock lb, drift rod
2|] and expansible spring l8. The upper portion
of the shaft 1 is reduced to provide a shoulder ‘Ir
and receive a feed tube ‘Iu, anti-friction bearings
45; 16 being interposed between the shoulder 11' and
axial opening To of the drive shaft and its upper ‘10
‘portion 1k is reduced and has a close ?t in a por
‘tion of the axial opening.
The expansible spring
I8 engages the bit stock and normally urges it
downwardly and disengaged from the drive shaft.
A square or non-circular portion ll‘, of the open- 15
ing ‘I0 is adapted to receive a correspondingly
shaped portion ‘lg of the bit stock when the latter
is in clutched engagement with the drive shaft.
These elements 1]‘ and lo constitute parts of a
clutch which are normally held out of engagement 20
by the spring l8 but which are in engagement
when pressure is exerted through the feed mem
ber lu to throw the bit into action. The bit stock
has alimited play determined by a stop 2| and an
annular recess ‘Ii, the part 2! being threaded into 25
the drive shaft 1 and the recess 'li being formed
- in the bit stock.
A nut la retains the feed member lu on the
drive shaft 1, a thrust bearing ls being interposed
between the nut and the drive shaft. A longi- 30
tudinal groove 'ld formed in a side of the part
111. receives the inner end of a screw l9 applied
to the bonnet 6a and prevents turning of the
feeder. Cog teeth 'lc formed in a side of the part
111, provide a rack which coacts with a pinion I6 35
fast to a shaft l?a mounted in the bonnet 6a. A
bar I‘! adjustable in a projecting end of the shaft
lBa provides a handle for exerting a variable
pressure to apply the bit.
Gearing 8 and 9 is mounted in the frame 6 and ‘10
imparts motion to the drive shaft 1 from a suit
able source of power, as a motor vehicle 22.
bevel gear 8 is splined to the drive shaft 1 to admit
of the latter moving longitudinally. The bevel
gear 9 is keyed to a socket l0 mounted in a tu- 4'5
bular extension of the plate 6b and retained in
place by a nut H. A ?exible shaft l2 transmits
power from _a suitable source and is protected
by a covering l3. The shaft I2 is secured in any
determinate way to the socket l0 and clamped 50
to the axle of a motor vehicle 22 by fastening
means 24, the drive wheel being jacked up, as in
dicated at 23.
Hooks [4 are applied to the frame 6 and engage
links of a chain 25 to hold the drill to the work 55
26 when the tool is in operation. A groove 81)
the drive shaft, coacting means between the frame
formed in a side of the shaft 1 receives a spline
8a which connects the shaft and bevel gear 8.
and pressure member for advancing and retract
ing the latter, a bit stock slidably mounted with
When the tool is adjusted for action, power is
transmitted thereto from asuitable source by
the shaft l2 or other preferred and convenient
means. Upon rotating shaft Ilia by means of
the handle I], the bit I5 is advanced and, at the
same time, the clutch ‘|f—1g is engaged and ro
10 tation of the bit effected. A counter-rotation of
the shaft l6a relieves the feed pressure exerted on
the bit I5 and permits disengagement of the
clutch and the idling of the drive shaft 1 without
the necessity of stopping the motive power. At
15 this stage the bit l5 may be released, replaced,
or adjusted. A tap on the drift rod 20 effects
release of the bit as heretofore stated.
Having thus described the invention, what I
claim is:
1. A boring tool comprising a frame, a drive
shaft mounted therein for rotation and having
a limited longitudinal movement therein, drive
gearing splined to the drive shaft, a bit stock
loosely mounted in the drive shaft and having an
25 independent longitudinal movement therein, a
clutch between the bit stock and drive shaft, a
spring normally holding the clutch disengaged, a
pressure member mounted on the drive shaft,
and pressure exerting means for advancing the
v30 bit and throwing the clutch into engagement.
2. A boring tool comprising a frame, a drive
shaft therein, a pressure member mounted on
in the drive shaft, a clutch disposed within the
drive shaft and automatically operable by Work 5
resistance to the tool feed, and a spring located
in the drive shaft and normally holding the clutch
3. A boring tool comprising a frame, a drive
shaft therein, a pressure member mounted on the 10
drive shaft, coacting means between the frame
and pressure member for advancing and retract
ing the latter, means for preventing rotation of
the pressure member relative to the frame, a bit
stock slidable in the drive shaft, a clutch housed 15
in the drive shaft and adapted to connect the bit
stock thereto, and a spring disposed within the
drive shaft and normally holding the bit stock
disengaged from the drive shaft.
4. A boring tool comprising aframe, a drive 20
shaft slidable in the frame, a pressure member
carried by the drive shaft and held from rota
tion relative to the frame, means for moving the
pressure member to control the feed, drive means
mounted on the frame and splined to the drive 25
shaft, a clutch and clutch disengaging spring
within the drive shaft and housed thereby, and a
drift rod passing through the drive shaft forv de
taching a bit therefrom and having the clutch
disengaging spring mounted thereon.
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