Improvements in Drilling Apparatus
Year: 1898

page_text: COMPLETE SPECIFICATION.
Improvements in Drilling Apparatus
We, WILLIAM JOHN HATTON, Machinist, and CUTLER ADANUS CRAM, Machinist,
both of Escanaba, County of Delta, State of Michigan, United States of America,
do hereby declare the nature of this invention and in what manner the same is to
be performed, to be particularly described and ascertained, in and by the follow-
ing statement:-
The object of our invention is to provide a drill especially adapted for making the
rivetholes in boilers, but which may be used with equally good results in con-
nection with any work where a similar opening is to be produced.
The invention consists in the novel construction and combination of the several
parts, as will be hereinafter fully set forth, and pointed out in the claims.
Reference is to be had to the accompanying drawings, forming a part of this
specification, in which similar characters of reference indicate corresponding
parts in all the figures.
Figure 1 is a side elevation of a boiler, illustrating the application thereto of the
device. Figure 2 is a rear elevation of the boiler to which the device is applied.
Figure 3 is a side elevation of the drilling device. Figure 4 is a longitudinal
section through the drilling device. Figure 5 is a section taken substantially on
the line 5 5 of Figure 4. Figure 6 is a side elevation of a boiler, showing the
application of the device thereto, provided with a hand-feed and adapted to be
driven by a flexible shaft or power other than manual power; and Figure 7 is a
side elevation of the modified form of the device.
Two uprights B and B¹, are employed, which are in the nature of rods, the
upright B being adjustably mounted in sockets 11, and the upright B₁ correspond-
ingly mounted in sockets 12. The sockets 11 are shown as adjustably connected
with tie-plates 10, which are screwed or bolted to the boiler near one edge, while
arms 13 are adjustably attached to the sockets 12, carrying the upright B', the
said arms
13 having longitudinal openings 14 made therein, through which
bolts are passed into a side of the boiler, as illustrated in Fig. 2. Under this con-
struction the uprights B and B are held a predetermined distance from the surface
of the boiler to be drilled, or the surface of any other object in which holes are to
be made.
Between the ends of the uprights B and B sleeves or sockets 15 are adjustably
secured, and these sleeves or sockets support the ends of a cross-rod C, which
carries an adjustable sleeve 16. The said adjustable sleeve carries a standard 17,
which at its lower end is provided with an adjustable socket 17, and in said socket
a guide rod 18 is secured, which engages with the surface of the article to be bored,
holding the drill to be hereinafter described a predetermined distance from the
said object, as shown in Fig. 2. If in practice it is found desirable, however, the
lower end of the post or standard 17 may be secured to the boiler, or the article
to be drilled or bored, in any suitable manner.
The drill is best shown in Figs. 3 and 4, in which the upper end of the standard
or upright 17 is enlarged, forming practically a bearing-surface 19, as shown in
the said figures. In the upper portion of the bearing-surface 19 a nut 20 is held to

page_text: revolve, being provided at one end with a gear 21. An exteriorly-threaded hollow
shaft 22 is held to turn in the said nut, being provided at its forward end with a
hand wheel 23, or a device of like character. A solid shaft 24 is mounted to turn
loosely in the exteriorly-threaded hollow shaft, the inner solid shaft 24 being
provided with a head 25, a chuck, or its equivalent, at its forward end, in which
the bit or drill 26 is secured.
Near the end of the hollow exteriorly-threaded shaft, opposite that end where the
drill is attached, a pinion 27 is mounted to freely revolve, which pinion is fast to
or is connected with an arm 28, the said arm being provided with a dog 30, adapted
for engagement with a ratchet-wheel 29, secured on the shaft 24. A hanger 31 is
passed loosely around the threaded hollow shaft 22, and at its lower end journals
a portion of a shaft 31ª, the said shaft being journaled at or near its center in the
upper portion 19 of the upright 17, as is clearly shown in Fig. 4. The shaft 31"
carries a gear 29", which meshes with the pinion 27, and on the said shaft 31",
which is the driven shaft, a pinion 33 is splined, being so mounted that the shaft
may slide through the pinion yet the pinion will turn with the shaft. The
pinion 33 meshes with a pinion 34, carried by the upper end 19 of the standard 17,
which gear is a double gear, and one of its toothed surfaces is made. to. mesh with
the gear 21 on the loosely-mounted nut 20, serving to turn the latter.
In operation, the drilling mechanism may be carried vertically to any desired
point on the boiler or the article that is to be drilled, and likewise may be adjusted
vertically to any position necessary. As the ratchet-arm 28 is revolved the drill
is turned, and a rotary, motion is communicated to the driven shaft 31", which in its
turn communicates motion to the threaded hollow shaft 22, which is the feed-shaft,
and consequently the said feed-shaft moves the drill a certain distance forward
as the drilling continues, the feed being possible since the feed-shaft, the drill-
shaft, and the driven shaft will all move forward together. A set-screw 32 is
located in the upper end of the hanger 31, and engages with the walls of a recess
on the exterior of the threaded and tubular shaft 22. If at any time the automatic
feed is not required, or if a further feed is desired either backward or forward,
such movement may be accomplished by turning the handwheel 23.
We desire it to be understood that any support other than that shown may
be employed for the drilling device, and that the drilling device may be pneu-
matically or hydraulically operated, or operated through the medium of a flexible
shaft, and that the feed instead of being automatic, as illustrated, may be manually
accomplished.
In Figs. 6 and 7 we have illustrated a slightly-modified form of the device, in
which an interiorly-threaded sleeve 35 is secured upon the standard 17. An
exteriorly-threaded and hollow adjusting-shaft 36 is passed through the said sleeve,
the adjusting-shaft being provided with a hand-wheel or a hand-grip 37, whereby
it may be turned. A drill-shaft 38 is mounted to revolve in the feed-shaft, being
provided with a head 39 at its forward end, and a tapering exteriorly-threaded and
split holder 40, the holder being preferably a continuation of the drill shaft being
adapted to receive a drill 41 or other tool, which tool is held firmly in the holder
by a lock-nut 42, arranged to admit of the expansion of the sections of the split
tool-holder and to draw the said sections together. A flexible shaft 43 is shown
attached to the rear end of the drill-shaft, and a nut 44 is placed at the rear portion
of the device, serving in connection with the head 39 to prevent end movement of
the drill-shaft, and the said nut 44 may likewise serve as a means for securing
the flexible shaft to the drill-shaft. Instead of the flexible shaft being used as the
driving medium, compressed air, or any other mechanical power, may be sub-
stituted.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is:-
:―
1. In a drilling apparatus, a supporting-frame consisting of independent up-

page_text: rights, fastening devices having vertical and lateral adjustment thereon, an adjust-
able cross-bar connecting the uprights, and an adjustable socket carried by the
cross-bar, arranged to receive the drilling device, substantially as shown and
described.
2. A support for a drilling device, consisting of uprights, sockets adjustable upon
the uprights, fastening devices adjustably connected with said sockets, a cross-
bar adjustably attached to the uprights, a socket adjustable upon the cross-bar,
a standard which is a portion of the drilling device, a socket adjustable upon said
standard, and a guide rod carried by the latter socket, all arranged for operation
substantially as set forth.
3. In a drilling device, the combination, with a support, a nut held to turn in
said support, and means for turning the nut, of an exteriorly-threaded tubular feed-
shaft passed through said nut and provided with a hand-grip, a drill-shaft mounted
to revolve in the feed-shaft, a tool-holder at one end of the drill-shaft, engaging with
the end of the feed-shaft, devices for preventing end movement of the drill-shaft,
and means, substantially as described, for driving the drill-shaft for the purpose
set forth.
4. A drilling device consisting of a standard, a nut held to turn in said standard
and provided with an attached gear, an exteriorly-threaded and hollow shaft
received by the said nut, a drill-shaft mounted to turn in the hollow shaft, having
a head which engages with one end of the hollow shaft, and a driving mechanism
for the drill-shaft, as and for the purpose set forth.
5. In a drill, the combination, with a standard, a nut held to turn in the standard,
provided with an attached gear, an exteriorly-threaded hollow shaft received by
the said nut and provided with a hand grip at its forward end, and a drill-shaft
held to turn in the hollow shaft, provided with a head engaging with one end of
said tubular shaft, of means, substantially as shown and described, for revolving
the drill-shaft, a shaft driven by said driving mechanism, mounted to turn and to
have end movement in the said standard, and a gear connection between the driven
shaft and the gear on the said nut, as and for the purpose set forth.
6. In a drill, the combination, with a standard, a nut provided with an attached
gear held to turn in the said standard, a tubular shaft exteriorly threaded, received
by the said nut, a drill-shaft held to turn in the tubular shaft, having a projection
at one of its ends, forming a shoulder for engagement with the tubular shaft, and
a ratchet-and pawl device for turning the drill-shaft, of a driven shaft mounted
to turn and to have end movement in said standard or upright, a gear carried by
the said driven shaft, a pinion carried by the ratchet-and-pawl driving mechanism,
meshing with the said gear, a pinion splined upon the driven shaft, and a double
gear, one surface of which double gear meshes with the said pinion and the other
surface with the gear on the said nut, substantially as and for the purpose specified.
Dated this 11th day of February 1898.
BOULT & WADE,
Agents for the Applicants.