Improvements in and relating to Appliances for Drilling Square or Polygonal Holes.
Year: 1891

page_text: Date of Application, 20th Mar., 1891
Com lete Specification Leit, 20th Jan., 1892-4ccepted. 12th Mar., 1-92
PROVISIONAL SPECIFICATION.
Improvements in and relating to Appliances for Drilling Square
or Polygonal Holes.
I, JAMES MELLING, of Dashwood House, New Broad Street, in the City of
London, Engineer, do hereby declare the nature of this invention to be as
follows:-
My invention relates to the adaptation to an ordinary drilling or boring machine,
of vertical or horizontal type, of a triangular or spade shaped tool or cutter,
combined with a templet, as described in the Specifications of Letters Patent
No. 13609 of A.D. 1890.
In carrying my invention into practice I construct a removeable nose piece or
chuck, which may be fitted to the spindle head of the drilling machine and rigidly
held in the same manner as an ordinary drill or bit. Said nose piece is bored so
that the shank of the tool or cutter fits loosely therein. A centre is fitted inside
the bore of the nose piece or chuck, which corresponds to a countersunk centre in
the shauk of the tool. A hole is provided in said shank, passing transversely
through it, and corresponding with a sinaller hole in the nose or chuck, so that a
pin may be passed through both. The hole in the shank of the tool or cutter is,
however bored sufficiently large as to be perfectly free of the pin.
When in use for drilling or boring a square or polygonal hole, the oscillatory, or
lateral movement of the tool or cutter is compensated by the free movement of the
shank upon the centre aforesaid, and within the nose or chuck, the function of the
pin being to drive or rotate the tool in unison with the spindle head.
Dated this 20th day of March 1891.
FREDK. WALKBB,
11, Furnival Street, Holborn, London, E.C., Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in and relating to Appliances for Drilling Square
or Polygonal Holes.
1, JAMES MELLING, of Dashwood House, New Broad Street, in the City of
London, Engineer, do hereby declare the nature of this invention and in what
manner the saine is to be performed, to be particularly described and ascertained in
and by the following statement :-
My invention relates to the adaptation to an ordinary drilling or boring machine
of vertical or horizontal type, of a triangular or spade shaped tool or cutter,
combined with a templet, as described in the Specification of Letters Patent
No. 13609 of A.D. 1890.
A centre a
In carrying my invention into effect construct a moveable nose piece or
chuck B (Figure 1 of the accompanying sheet of drawings) which may be fitted to
the spindle head A of the drilling machine and rigidly held by the set screw C in
the same manner as an ordinary drill or bit. The nose piece B is hollowed or
bored so that the shank of the tool or cutter E may fit loosely therein.
if fitted inside the bore of the nose piece or chuck B, which corresponds to a
countersunk centre in the shank of the tool E as shown. A hole is provided in
said shauk, passing transversely through it a corresponding with a smaller hole in
the nose or chuck B so that a pin or bolt b may be passed through both. The hole
in the shank of the tool or cutter Eis, however, bored sufficiently large as to be
TD 017

page_text: perfectly free of the pin or bolt as regards vertical movement.
This arrange-
ment may be modified by using an extension or collar D Figure 2, and fitting the
pin or bolt and centre a directly to the spindle head A; D being attached to,
and forming an extension of, the tool or cutter E. A plan view sectioned
above b, Figure 3, serves to further illustrate the device.
When in use for drilling or boring a square or polygonal hole, the oscillatory or
lateral movement of the tool or cutter is compensated by the free movement of the
shank of E or D upon the centre a aforesaid and within the nose or chuck Bor
spindle head A, Figures 1 and 2 respectively, the function of the pin or bolt b
being to drive or rotate the tool E in unison with the spindle head.
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 ;-
In a device for drilling or boring square or polygonal holes, the employment
and arrangement of a tool or cutter working freely upon a pin or equivalent to
allow of lateral motion in addition to the rotary movement of said cutter,
substantially as herein described, and shewn by the appended drawings.
Dated this 19th day of January 1892.
FREDK. WALKER,
11, Furnival Street, Holborn, London, E.C., Agent for the Applicant.