Improvements in Drilling or Boring Apparatus, especially applicable to Existing Machines.
Year: 1890

page_text: Date of Application, 25th Oct., 1890
Complete Specification Left, 3 st Jan., 1891-Accepted, 7th Mar., 1891
PROVISIONAL STIFTUATION.
Improvements in Drilling or Boring Apparatus, especially
applicable to Existing Machines.
I, JAMES MELLING, of Dashwood House, New Broad Street, in the County of
Middlesex, Engineer, do hereby declare the nature of this invention to be as
follows:-
My invention relates to a method of, and means for, adapting a bit or cutter,
in combination with a templet, to a drilling or boring machine, for boring or
drilling square or polygonal holes, or to an ordinary hand brace. The object of
my said invention is to adapt the cutting tool and templet to an ordinary machine
provided with a rotary and horizontal or vertical feed movements, without
rendering any structural alteration of the parts necessary, and in fact, to provide
an efficient tool for drilling or boring polygonal holes which may form part of
the outfit of an ordinary drilling or boring machine, and also to be used with a
hand brace, upon wood or metal.
In carrying my invention into effect, since the required oscillatory movement
of the bit or cutter must in this case be compensated by a similar movement of
the work during the operation of drilling or boring, I provide a moveable table
to which said work is attached. Said moveable table is mounted upon a system
of levers, forming a pantograph movement or system, the main fulcrum of which
is piyotted to the fixed table of the machine. Thus, the motion of the bit or
cutter is confined to a fixed centre, and the irregular oscillatory movement (con-
trolled by the polygonal templet) is provided by the arrangement of levers above
referred to.
In applying the bit or cutter to a hand-brace, I prefer to allow a free movement
of the shank within the head, which, in the ordinary use of said tool, admits of
the free lateral movement of the cutting and guiding edges of said tool required
for producing polygonal holes in wood or metal, to which a templet may be
attached, by spikes, bolts or equivalent means.
1...
1200
FREDK. WALKER,
11, Furnival Street, Holborn, London, E.C., Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Drilling or Boring Apparatus, especially
applicable to Existing Machines.
I, JAMES MELLING, of Dashwood House, New Broad Street, in the County of
Middlesex, 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 :-
My invention relates to a method of, and means for, adapting a bit or cutter in
combination with a templet, to a drilling or boring machine, for boring or drilling
square or polygonal holes, or to an ordinary hand brace. The object of my said
invention is to adapt the bit or cutting tool and templet aforesaid to any type of
machine that can be used for drilling or boring, without rendering any structural
alteration necessary, since the apparatus or appliance may form part of the outfit
of such machines and may be readily attached or detached when necessary.
In order that my invention may be clearly understood, I have appended the
accompanying sheet of drawings in which Figure 1 is a plan view of the device,
and Figure 2 an elevation thereof. Figure 3 is a diagram, representing the system

page_text: of levers, hereinafter to be described. Figure 4 is a sectional elevation of the
knob or fulcrum of a hand brace, arranged for use in square or polygonal drilling,
and Figure 5 is a templet, provided with spikes, for drilling or boring wood or like
material, in conjunction with the hand brace aforesaid.
In carrying my invention into effect, I provide means for an oscillatory or
irregular movement of the work in the first case, by employing.a, chuck or table F,
Figures 1 and 2, mounted upon, and sustained by a system of levers, shewn more
particularly by the diagram Figure 3. A lever e is pivotted at d to a bracket n
which may be suitably attached to the table or chuck of a machine to which the
necessary rotary and feeding motion may be applied. Links and " jointed to
links and form a support for the table or chuck F at the centre g. Said table
or chuck F is therefore free to move or oscillate upon the plane of the fixed table
or chuck E of the machine to which it is applied, and so follow the irregular
movement of the drill or cutter within the templet. The drill or cutter A may be
of triangular cross section, or may be fluted, and a templet C is attached by screws
or the like to the work that is to be drilled or bored, represented by W Figure 2.
In this case the drill stock and holder G are revolved upon a fixed centre. I may,
as an alternative arrangement according to my invention, dispense with the levers
or links e, f, f¹, and substitute therefor a ball joint, connecting the table F
with the fixed table E.
In applying my invention to a hand brace, as shewn by Figure 4, I allow a free
movement of the shank H within the head I, by using a ball, or rounded terminal i,
working freely within a recess formed in said head 1, the shank H being turned,
shaped, or shouldered at to be of less diameter than the main portion thereof, said
reduced part freely oscillating during the rotation of the brace in drilling, upon the
ball shaped or rounded head before described. In using said brace for drilling or
boring wood or other material or substance of a similar nature, I employ a drill or
cutter of triangular or spade shaped cross section, in combination with a templet of
steel or other hard metal as shewn by Figure 5, provided with spikes k for attaching
to the work, or said templet may be clamped screwed or bolted thereto.
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 :-
First. In an apparatus for drilling or boring square or polygonal holes, the
combination of an additional table or chuck to the fixed chuck of a machine, with a
triangular drill or cutter and templet substantially as described and shewn by the
drawings hereunto appended.
Second. In an apparatus for drilling or boring square or polygonal holes the
methods of and means for allowing the additional table or chuck referred to in the
preceding claim, to move in accordance to the motion of the drill or cutter within
the templet, substantially as herein described and shewn by the drawings.
Third. In an apparatus for drilling or boring square or polygonal holes, the
combination of a drill or cutter, portable table or chuck, and levers, substantially
as described and shewn.
Fourth. In an apparatus for drilling or boring square or polygonal holes, the
combination of a hand brace, with a moveable shank, drill or cutter and templet
substantially as herein described and shewn by Figure 4 of the appended drawings.
Fifth. In an apparatus for drilling or boring square or polygonal holes, the
employment and construction of a spiked templet substantially as herein described
and shewn by Figure 5 of the appended drawings.
Dated this 30th day of January 1890
FREDK. WALKER,
11, Furnival Street, Holborn, London, E.C., Agent for the Applicant.