Improvements in Apparatus for Boring or Drilling.
Year: 1895

page_text: Date of Application, 25th Oct.. 1:895
Complete Specification Left, 27th July, 1896-Accepted, 29th Aug., 1896
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Boring or Drilling.
I, JAMES MACEWAN Ross, of the Firm of R. G. Ross & Son, Engineers,
Greenhead Works, Glasgow, in the County of Lanark, do hereby declare the
nature of this invention to be as follows:-
This invention has for its object to provide a simple and inexpensive portable
and self-contained machine for boring or drilling, the motor which operates
the boring or drilling tool being contained within and forming part of the
machine casing.
The improved boring or drilling machine comprises a cylindrical casing which
preferably constitutes the cylinder of a rotary engine of the type described in the
Specification of Letters Patent No. 4403 of 1887 or of other type but which may
form the enclosing casing of any simple high speed motor. In the preferred.type
of motor the cylinder is double cased around part of its perimeter the cylinder
proper being eccentric to the casing and space being left between them for inlet
and exhaust passages for the steam, air or other pressure fluid which is admitted
and exhausted through ports in the cylinder walls to drive the pistons,
the latter being fitted around a central barrel through which the driving
shaft passes and being connected to operate the shafts by studs or pins on discs or
collars on the shaft. One end of the cylinder is fitted with a cover.providing a
bearing for the shaft whilst the other is préferably in a piece with the cylinder
casing and forms a web or division plate separating the cylinder from an extension
of the casing into which the shaft passes and in which is placed gearing for trans-
mitting the rotatory movement of the shaft at reduced speed to the boring or
drilling tool. This gearing consists of an internally toothed wheel keyed upon the
tool holding spindle which is carried through a bearing formed in a removable
cover fitted on the extended end of the casing, and an externally toothed wheel of
smaller diameter fitted loosely on an eccentric 'boss keyed. on the motor shaft the
latter wheel being guided in a bridge piece so that it does not rotate but is carried
around the axis of the shaft with its teeth brought in succession into gear with the
teeth of the other wheel which is thereby driven at a greatly reduced speed. The
relative positions of the internally and externally toothed wheel may be reversed
if desired.
The tcol holder or socket piece for the drilling or boring tool is, preferably
screwed over the end of the holder spindle and held by ;a jam nut, ball bearings to
take up the thrust upon the tool being provided and interposed between the socket
piece and the end-cover. At the opposite or upper end the motor shaft may be
fitted with a hand wheel, and over the end cover is carried a bridge on
which may be fitted the ordinary hand feeding screw and centre or an automatic
feed.

page_text: Improvements in Apparatus for Boring or Drilling.
I, JAMES MACEWAN Ross of the Firm of R. G. Ross & Son, Engineers,
Greenhead Works, Glasgow, in the County of Lanark, 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 following statement :—
This invention has for its object to provide a simple and inexpensive portable
and self-contained machine for boring or drilling, the motor which operates the
boring or drilling tool being contained within and forming part of the machine
casing.
The invention is illustrated by the accompanying drawings, Figure 1 of which
is a longitudinal vertical section on the line X-X Figure 2, and Figure 2 is a
transverse section on the line Y-Y Figure 1 of the improved apparatus. Figure 3
is a detail view of the speed reducing gear and Figures 4 and 5 are views at right
angles to each other of a modification of the same.
The improved boring or drilling machine comprises a cylindrical casing A
which preferably constitutes the cylinder of a rotary engine of the type described
in the Specification of Letters Patent No. 4403 of 1887 or of other type but
which may form the enclosing casing of any simple high speed motor. In the
preferred type of motor the cylinder may either be double cased around part of
its perimeter, the cylinder proper in which the pistons B work, being eccentric to
the casing A and space being left between them for inlet and exhaust passages for
the steam, air or other pressure fluid, or as shown the pistons may work in a loose
ring C eccentric to the casing A which forms the cylinder proper. Steam is
admitted and exhausted through ports D, E in the cylinder walls to drive the
pistons B, the latter being fitted around a central barrel F through which the
driving shaft G passes and being connected to operate said shaft by studs or pins H
on discs or collars I on the shaft in the manner described with reference to the
above mentioned specification. One end of the cylinder is fitted with a cover A¹
providing a bearing for the shaft G whilst the other is preferably in a piece with
said casing and forms a web or division plate A' separating the cylinder A from
an extension of the casing into which the shaft passes and in which is placed gearing
for transmitting the rotatory movement of the shaft at reduced speed to the boring
or drilling tool J. This gearing consists of an internally toothed wheel K keyed
upon the tool holding spindle L which is carried through a bearing formed in a
removable cover A³ fitted on the extended end of the casing A and an externally
toothed wheel M of smaller diameter fitted loosely on an eccentric boss N keyed
on the motor shaft G the latter wheel M being guided in a bridge piece O, shown
at Figures 1 and 3, so that it does not rotate but is carried around the axis of the
shaft G with its teeth brought in succession into gear with the teeth of the other
wheel K which is thereby driven at a greatly reduced speed. The relative positions
of the internally and externally toothed wheels K, M, may be reversed if
desired.
The tool holder or socket piece O¹ for the drilling or boring tool J is preferably
screwed over the end of the holder spindle L and held by a jam nut Q, ball
bearings R to take up the thrust upon the tool J being provided and interposed
between the socket piece O¹ and the bearing on the end cover A³. At the opposite
or upper end the motor shaft G may be fitted with a hand wheel S and over the end
cover A' is carried a bridge T on which may be fitted the ordinary hand feeding
screw and centre U or an automatic feed.
In lieu of the above described arrangement of speed reducing gear any similar
form of speed reducing gear may be used as for example that shown by Figures 4
and 5. In this case the rotating shaft G of the motor or other rotating shaft has

page_text: keyed or formed on it eccentrically a boss or short cylindrical shaft P or a crank
or eccentric on which is loosely fitted a duplex toothed wheel V or pair of wheels
united together side by side one being of larger diameter than the other. The one
toothed wheel or portion of the wheel is geared with an internally toothed wheel W
secured by flanges or otherwise on a stationary part of the cylinder framing or
bearing block of the driving shaft G, and the other wheel is geared with an
internally toothed wheel Y of larger diameter keyed on the boring tool spindle L.
Upon rotation of the driving shaft G, the smaller toothed wheel of the duplex
wheel V rolls around the stationary internally toothed wheel W whilst the second
toothed wheel V carries around with it the internally toothed wheel Y on the
boring tool spindle L and thereby drives the latter at a reduced rate of speed.
A counterbalancing weight may be secured on the eccentric boss or wheels to
ensure uniform rotation.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is-
1. The combination of parts constituting the improved portable boring or drilling
machine herein before described.
2. In apparatus for boring or drilling the combination with a rotary driving
engine of gearing such as described for transmitting the power of the engine at
reduced speed to the boring or drilling spindle.
Dated this 24th day of July 1896.
WALLACE FAIRWEATHER,
Chartered Patent Agent,
62 St. Vincent Street, Glasgow, Agent for the Applicant.