Improvements in Machines for Drilling, Reamering, Tapping and the like.
Year: 1899

page_text: Date of Application, 5th Sept., 1899-Accepted, 6th Jan., 1900
COMPLETE SPECIFICATION.
Improvements in Machines for Drilling, Reamering, Tapping and the
like.
I, GLENN BURGESS. HARRIS, of No. 318, West Seymour Street, Philadelphia,
County of Philadelphia, State of Pennsylvania, United States of America, Gentle-
man, do hereby declare the nature of my invention, and in what manner the same
is to be performed, to be particularly described and ascertained in and by the
following statement:-
My invention relates to an improvement in rotary drills, and particularly to that
class designed especially for use in drilling, reaming, tapping, and work of an
analagous character.
The object of my invention is to provide a machine of this class, which shall
be simple in its construction, effective in operation, and in which wear of the
parts, particularly the cylinder, will be reduced to a minimum.
The invention consists in certain novel features of construction, and combina-"
tions of various parts, as will be hereinafter more fully described, and pointed out
in the claims.
In the drawings, Fig. 1 is a vertical sectional view of a drill embodying my
improvements, and Fig. 2, is a horizontal sectional view.
Like letters of reference indicate like parts in both figures.
An oil
A represents the cylinder having the top, and bottom heads a, a, firmly bolted
to its opposite ends. The top head a, has an extension a³, provided with a
threaded opening a³, in which is located the feed screw a', which is engaged by
the handle a, by which the machine is fed forward as work progresses.
cock, is also located in the top head a, to provide for proper lubrication.
Secured to the bottom head a¹, is a bottom piece B, which is substantially of the
shape of a truncated cone, and which forms in connection with the bottom
head a', a casing or chamber b, for containing the necessary gearing as will be
more fully explained.
'
C designates the hollow piston, which is cylindrical in shape, and which is
eccentrically located in the cylinder A. This piston C, has the top cap piece C¹,
which is provided with a centrally located opening to receive the center bearing B²,
secured to, and projecting downwardly from the top head a, and on which said
piston turns. The bottom of the piston is provided with a threaded opening into
which is screwed or otherwise secured the extension of a driving pinion D, which
projects into the chamber b. The piston, as will be seen, has a bearing in the
bottom head a¹ and is thus firmly supported in a vertical position.
E represents a pin on which are mounted a plurality of blades, preferably
three. This pin has bearing at its upper end in the center bearing B2, and
extends through the piston C, being located eccentrically to said piston, and con-
centrically with the cylinder. The blades F, as before stated are mounted upon
the pin E, and their outer ends extend through rocker pins G, fitting in openings
in the walls of the piston, and bearing at their ends in the heads of the piston C,
said rocker pins being slotted to permit the passage of the blades. The outer
ends of the blades F, abut against the interior wall of the cylinder, and are

page_text: provided with packing strips d, which are forced outwardly by the motive fluid,
which enters openings d', in the blades in the rear of the strips.
The motive fluid is introduced to the cylinder at a point just in advance of
that at which the piston abuts against the cylinder, and is controlled by' a suitable
throttle valve H. The air is exhausted at the point E³.
Located between the bottom head a', and the bottom piece B, is an integral
rack f. Meshing with the rack f, are the idlers y, which also engage the pinion D.
These idlers'g, are journalled on a frame 1, having bearing at its lower end in the
bottom piece B, ball bearings being interposed at the points h, h¹, to eliminate
friction. The frame 1, extends through, and below the bottom piece B, and is
threaded to receive a suitable tool socket.
Locking nuts i, are provided for holding the frame I, in position and for taking
up wear.
The operation is as follows:-Air being admitted to the machine strikes against
the face of the blade nearest the point, of, induction, the piston from its eccentric
location fitting against one of the interior side walls of the cylinder; and, forming
an abutment, thus preventing the flow of air in but one direction. In this way
the blades are caused to revolve, and carry the piston with them, said blades
sliding in and out the piston. The rocker arms through which the blades pass
partially turn to accommodate themselves to the changes in the angularity of the
blades. As each of the blades pass the exhaust the 'air is discharged. The rota-
tion of the piston carries with it the attached pinion, which meshes with the
idlers, and the latter engaging the interior rack causes the idler frame to rotate;
and carry the drill socket or other attached tool holding device with it. A's¹ the
work progresses the machine is advanced by means of the feed screw. In reaming,
and tapping operations the latter is dispensed with.
1 J
$1,
For convenience in reaming, and tapping, suitable handles are provided by
which the machine may be conveniently handled, said handles being located at
diametrically opposite points to balance the machine, and also being made hollow
to convey air to, and convey its discharge from the drill.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is ;-
1. In a pneumatic drill, the combination with a cylinder, having induction, and
exhaust ports, of a piston eccentrically, located therein, and a plurality of blades
concentrally located with relation to the cylinder and eccentrically located with
respect to the axis of the piston, substantially as described.
2. The combination with a cylinder, of a piston located eccentrically therein, a
series of rocker arms mounted in said piston, and a plurality of blades located
within the piston, and having their ends projecting through said rocker arms,
as set forth.
3. The combination with a cylinder, of a piston eccentrically located therein,
a plurality of blades concentrically located within the cylinder, a pin on which
said blades are mounted, and rocker pins located in openings in the piston, and
having bearing in the upper and lower ends of the piston, said blades extending
through slots in the rocker pins, as set forth.
4. The combination with a cylinder having a center bearing, of a piston eccen-
trically located in said cylinder, and having an opening to receive said bearing,
a pin having bearing in the said center bearing at one end, a plurality of blades
mounted on said pin and concentrically located with respect to the cylinder,
rocker pins mounted in the piston and having bearing in the ends thereof, said
blades extending through the rocker pins, and a driving pinion adapted to mesh
with suitable gearing, and attached to the lower end of the piston, substantially
as set forth.
5. The combination with a cylinder, of a piston located therein, a plurality of

page_text: blades mounted on a pin having bearing in said piston, rocker pins journaled in
the ends of the piston, and fitting in openings in the same, and bearing strips
fitting in slots in the ends of the blades, and designed to be forced outwardly by
the motive fluid, substantially as set forth.
6. The combination with a cylinder having the top, and bottom plates, and a
center bearing extending downwardly from said top plate, of a piston having an
opening to receive said center bearing, and having its lower end extending below
the bottom plate, a plurality of blades located within the cylinder and adapted to
rotate the piston, a pinion secured on the lower end of the piston, a bottom piece
secured to the bottom plate and forming a casing or chamber, and gearing located
within said casing or chamber and operated by the driving pinion, as set forth.
7. The combination with a cylinder, of a piston located therein, a plurality of
blades for rotating said piston, a pinion secured to the lower end of the latter,
idlers meshing with said pinion, a stationary rack engaged by said idlers, and
means for attaching the tool holding socket, as set forth.
8. The combination with a cylinder, of a piston located therein, a plurality
of blades for driving said piston, a bottom piece attached to said cylinder and
forming a chamber, a pinion secured to the lower end of the piston, an idler
frame mounted in the bottom piece, and carrying idlers for engaging the driving
pinion, and an internal rack with which said idlers also mesh, whereby the idler
frame and the tool carrying socket are rotated, substantially as set forth.
Dated this 5th day or september 1899.
F. WISE HOWORTH,
46, Lincoln's Inn Fields, London, W.C.,
Agent for the Applicant.
F. WISE HOWORTH,
46, Lincoln's Inn Fields, London, W.C.,
Agent for the Applicant.