Improvements in Drilling Machines.
Year: 1887

page_text: Improvements in Drilling Machines.
I, SAMUEL BEECHING, of Mareham-le-Fen, near Boston, in the County of Lincoln-
shire, Engineer, 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 :-
The improvements according to my Invention relate to the class of drilling machines
known as radial drilling machines. In the device which I adopt in accordance with
said improvements the head of the machine swivels completely round. I avoid the
use of bevilled wheels, thereby considerably lessening friction in working, and also
necessitating the employment of one spindle less than usually occurs in the types of
drilling machines above referred to: The machine according to my improvements
may be used either as a bench machine with treadle motion leaving the hands free; or
it may be worked by hand; or, otherwise, be operated by power as may be desired,
the feed being so arranged as to work automatically.
In order that my Invention may be the better understood, I have appended the
accompanying sheet of drawings in which Figure 1 represents a side elevational
sectional view of the device according to my Invention, and Figure 2 a section taken
on the line A B, Figure 1, relating to the arrangement of back gear which I adopt,
hereinafter referred to and described. Though I may here state that my improved
drilling machines would not ordinarily be made with back gear for drilling holes under
inch diameter.
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The standard or pillar a, a' (which is mounted upon a suitable base b, the under
side of which is hollow) is formed with a boss c for carrying the arbor d, and is also
of smaller diameter at the top to allow of the radial arm e revolving around the upper
part a of the pillar a. it being kept in position by means of the cap through which
passes the upright spindle y, having mounted at its upper end the fly wheel h; the
lower end of said upright shaft or spindle g terminates in a crank and pin i which is
used in connection with the foot treadle j to which it is attached by means of a cord k,
which passing over the pulley or roller is attached to the treadle in the ordinary
manner. At the outer end of the radial arm e, before mentioned, is carried the
spindle and socket A, A¹, for holding the drills, this spindle being, as will be seen on
reference to the drawings, rotated by means of a belt running on the speed pulleys m
[Price Bl

page_text: and m³ respectively; motion being imparted in the first instance to the upright
spindle g by means of the cranked handle an, operating, through the arbor d, the
mitre wheels o o, or by working the treadle j; or, otherwise, as before mentioned, the
spindle may be driven by power.
In reference to the back gear which I have herein before stated I employ for heavy
work, it will be seen on reference to the drawing Figure 1. that the pinion B is cast
solid with the small speed wheel m¹. Said pinion B working in the back gear as
indicated at P figure 2, the wheel c being thrown in and out of gear by means of the
key D. The boss of the wheel c being so turned as to form the sheave of the
eccentric E. I accomplish the automatic lowering of the drill in the following
manner; the top of the drill spindle has formed upon it a screw F upon which is
fitted the crown wheels having notches formed circumferentially around the
top of same, and into which takes the pawl ; said pawl u being pivotted at the top of
a spindle to which is imparted reciprocatory motion by means of the eccentric w.
Thus it will be seen that upon the pawl working back and forth, the drill will be
lowered proportionately to the degree to which the strap of the eccentric is set in the
slot G. Figure 2. The hollow base is provided as shewn at with the usual drilling
plate and which may be raised or lowered as desired. Also with a view to increase
the utility of the device according to my Invention as a handy bench manchine tool
I may use a side vice in conjunction therewith by means of the side plate y attached
to the face of the machine base b, as will be readily understood on reference to the
drawings.
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:-
The improved radial drilling machine substantially as herein described and shewn
in the accompanying drawings.