Improvements in Appliances for use in Machine Tools for Cutting Elliptical Holes.
Year: 1889

page_text: Date of Application, 23rd Oct., 1889-Accepted, 7th Dec., 1889
COMPLETE SPECIFICATION.
Improvements in Appliances for use in Machine Tools for Cutting
Elliptical Holes.
I WILLIAM FERGUSON of 12 Camden Terrace Clifton Vale Bristol Boiler Maker
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:-
My invention is designed to provide a tool which may be used in a drilling
machine lathe or the like for the purpose of cutting our holes of elliptical form in
plates or boring them out in castings forgings or other forms in which metal wood
or other material (to which the tool could be applied) is to be operated upon.
The two accompanying sheets of drawings illustrate my invention.
Figure 1 shews a side elevation of the improvel tool, and
Figure 2 a plan of the same.
In carrying out my invention I employ a sun and planet motion to operat: an
arm or bar working a sliding and adjustable tool holder whereby an elliptical path
can be traced by the tool.
Referring to the letters of reference marked on the drawings, A is a fixed sun
wheel on which the arm or har B revolves said wheel having any even number of
teeth.
Fixed to the said wheel is a boss C of sufficient length to suit the depth of the
hole to be cut or bored out.
E is a planet wheel or pinion with exactly half the number of teeth of the sun
wheel A and gearing therewith.
F is a crank arm with an adjustable crank pin G fixed on the spindle H of
the planet wheel aforesaid and this spindle works in a prolongation of the arm or
bar B.
The other or opposite end of the arm or bar B carries the adjustable tool holder I
a guide spindle J on the under side of the arm or bar B fits in a hole in the centre
of the sun wheel to ensure a true rotary motion of the arm or bar and a perfect
gearing of the two wheels.
The slide K of the tool holder I carries a pin M. similar to the crank pin G and
both pins are connected by the connecting rod N.
A reciprocating motion of the tool holder is therefore obtained by the rotary
motion of the crank pin G.
The boring spindle O of the drilling machine or the boring bar of the lathe or
other machine to which my invention is applicable is forked as at P and clutches
or engages with the arm B of the apparatus to which it is secured by holts Q or
otherwise.
The fork of the boring spindle O is sufficiently open to admit of the full play of
the connecting rod N working within it.
When employing the apparatus above described for operating on a plate such as R
the sun wheel A with its boss is firmly secured to the plate R (or other object to be
operated upon) with the hole for the guiding spindle of the arm or bar B in a central
line with the boring or drilling spindle O.
The arm or bar B being made to revolve by the boring or drilling spindle O
the planet wheel or pinion is made to travel round the fixed sun wheel Â at the
same time rotating twice on its axis to one revolutio of the arm or bar B and thereby
giving the crank F also a rotary motion which transmits reciprocatory motion to the
slide K and the tool holder 1.
As the arm or bar B revolves the slide K an tool holder I will trace an elliptical
igure in proportion to the throw of the adjustable crank pin G.

page_text: 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
chim is:
:
First In a tool for atta hment to a boring or drilling machine lathe or the like for
the purpose of cutting or forming elliptical holes or slots, the combination of a fixed
-un wheel adapted to be secured to the work to be operated upon, a planet wheel
engaging therewith and carrying an arm or connecting rod operating a reciprocating
tool holder whereby the motion of the "planet" round the fixed " sun traces an
elliptical path by the tool and means for operating such tool substantially as herein
described and illustrated in the accompanying drawings.
وو
Second The general arrangement and construction of apparatus for cutting or
torming elliptical holes substantially as herein describe and illustrated by the
accompanying drawings.
11:09 11Datab 1900
POPPLEWELL & Co.,
17 & 18, Southampton Buildings, London, W.C., Agents for the Applicant.