Improved Tool or Outter for Boring Holes in Metal Plates.
Year: 1898

page_text: Improved Tool or Outter for Boring Holes in Metal Plates.
I, JOHN FREDERICK CADELL, of Clagett Street, Baltimore, Maryland, United
States of North America, Engineer, do hereby declare the nature of this inven-
tion to be as follows:-
My invention relates to tools for boring holes in metal plates and particularly
for boring boiler plates to receive the tubes.
The object of the invention is to provide a boring tool of this class which 18
simple in construction and very effective in operation and in which inexpensive
cutters formed from ordinary bars of tool steel may be used.
The tool consists of a circular stock with a cylindrical head which is screwed
onto the stock The head is provided on the forward aide with sections of a cir-
cular flange having straight forward edges which support the projecting cutters,
the rear sides of the supporting flanges being cut away and a considerable space
left between the rear of each support and the forward side of the succeeding
cutter to provide ample room for the escape of the cuttings.
In the periphery of the head there are several grooves adapted to receive the
Baid cutters, the grooves and cutters being preferably rectangular.
The outters are formed of ordinary square iods of tool steel slightly ground away
at the forward ends into suitable shape and of full rectangular section for the
remainder of their length. The forward or cutting edges of the tools are radial
to the centre of the stock and the inner lines of the cutters may be at right
angles to these ladii
The cutter edges extend slightly beyond the penphery of the head, so as to
give clearance for the supports The cutters may be arranged, so that the first
cuts one-third of the total width, the second cutting about two-thirds and the
third cutting the full width, in which case the first cutter should cut deepest,
the others following in succession.
Each
The cutters are held in position by clamps of novel construction
cutter is provided with a clamp, consisting of an L-shaped jaw and a clamping
screw which enters a hole formed in the head. The forward end of the clamp is
preferably toughened or provided with teeth to firmly hold the cutter bars. In
order to permit the forward ends to be seated accurately and across its entire
surface on the cutter bar the bearing of the other end 18 curved in the arc of
a circle and 18 seated in a circular recess formed in the periphery of the head
In this manner the cutters are held firmly and solidly in position.
The tool is provided on its forward end with a central spindle which enters a
hole previously dulled in the plate and guides the tool. This spindle is prefer-
ably provided with hardened teeth or cutters on its forward end for the purpose
of reaming the hole to the exact size of the spindle The spindle is removable
from the stock so that its cutters may be readily sharpened or repaired. It is
provided with a threaded shank which screws into an opening in the forward
end of the stock.

page_text: One of the principal advantages of my invention is that specially formed cut-
ters are not essential. The cutters used are simply ordinary bars of tool steel
having their forward ends ground into shape and tempered. When the cutters
are dulled or worn the grinding can be carried farther back on the bar and the
bar advanced. As the cutters are the only parts liable to wear and are inexpen-
sive the tool is exceedingly durable and economical Other valuable features of
the invention are the clamps which adjust themselves accurately to the tools
and the removable centering spindle having cutters on its forward end.
Dated this 10th day of June 1898.
S S. BROMHEAD,
Agent for Applicant, 171, Queen Victoria Street, London, E.C
Sputter for boring Holes in Metal Plates,
I, JOHN FREDERICK CADELL, of Clagett Street, Baltimore, Maryland, United
States, America, 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 tools for boning holes in metal plates and particularly
for boring boiler plates to receive the tubes.
The object of the invention 18 to provide a boring tool of this class which is
simple in construction and very effective in opperation and in which inexpen-
Bive cutters formed from ordinary bars of tool steel may be used The invention
will be described in detail in the following specification, reference being had to
the accompanying drawing in which
Fig is a view of the cutting end of the boring tool.
Fig 218 a side view of the same partly in section on the line 2 of Figure 1
and partly broken away.
Fig 3 is a section on the line 3 of Fig 2
Fig. 4 16 a perspective view of a portion of the head, and
Fig 5 18 a perspective view of one of the clamps.
In the drawing, I indicates the stock of the tool und 2 a cylindrical head
which is screwed onto the stock, as clearly illustrated in Fig 2. The head is
provided on the forward side with sections of a circular flange 3, having straight
forward edges 4, which support the projective cutters 5, the rear sides of the
supporting Hanges being cut away as at 6, and a considerable space left between
the rear of each support and the forward side of the succeeding cutter to pio-
vide ample room for the escape of the cuttings
In the periphery of the head there are several grooves 7, adapted to receive
the cutters 4, the grooves and cutters being preferably rectangular as shown.
The cutters are formed of ordinary square rods of tool steel slightly ground away
at their forward ends into suitable shape and of full rectangular section for the
remainder of their length. The forward or cutting edges of the tools are radial
to the centre of the stock and the inner lines of the cutters may be at right
angles to these radu. The cutter edges extend slightly beyond the periphery of
the head, so as to give clearance for the supports 3 The cutters may be arranged,
as shown, so that the first cuts one-third of the total width, the second cutting
about two-thirds, and the third cutting the full width, in which case the first
cutter should cut deepest, the others following in succession.

page_text: The cutters are held in position by clamps of novel construction. Each
cutter is provided with a clamp, consisting of an L-shaped jaw 8, and a clamping
screw 9, which enters a hole 10 formed in the head. The forward end of the
clamp is preferably roughened or provided with teeth 11, to firmly hold the
cutter bars In order to permit the forward ends to be seated accurately and
across its entire surface on the cutter bar, the bearing 12 of the other end, 18
curved in the arc of a circle and is seated in a circulai recess 13, formed in the
periphery of the head. In this manner the cutters are held firmly and solidly
in position.
The tool is provided on its forward end with a central spindle 14, which enters
a hole previously drilled in the plate and guides the tool. This spindle is pre-
ferably provided with hardened teeth or cutters 15 on its forward end for the
purpose of reaming the hole to the exact size of the spindle. The spindle is re-
movable from the stock so that its cutters 15 may be readily sharpened or
repaired. It is provided with a threaded shank 16, which screws into an open-
ing 17, in the forward end of the stock
One of the principal advantages of my invention is that specially formed
cutters are not essential. The cutters used are simply ordinary bars of tool steel
having their forward ends ground into shape and tempered. When the cutters
are dulled or worn the grinding can be carried farther back on the bar and the
bar advanced As the cutters are the the only parts liable to wear and are
inexpensive the tool is exceedingly durable and economical. Other valuable
features of the invention are the clamps which adjust themselves accurately to
the tools and the removable centering spindle having cutters on its forward end.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed, I declare that what I
claim 18:
1. A bong tool comprising a stock, a head, grooves in the head adapted to
receive cutter bars, flanges supporting the cutter bais aud clamps for holding
said bars in position, substantially as described and set forth.
2 A boring tool comprising a stock, a removable head on the stock, cutters
seated in grooves in the head, flanges supporting the cutters, clamps arranged
to hold said cutters, and a centering spindle detachably inserted in the forward
end of the stock, substantially as described, and set forth.
•
3 The combination with the stock, the head, the grooves in the head, and
the cutter bats in said grooves, of clamps for holding said bars each consisting
of an L-shaped jaw having one end adapted to rest upon the bar and the othei
end rounded and resting in a curved notch on seat in the head, and screws for
holding said jaws, substantially as described, and set forth
4 The combination with the stock, the head having grooves and cutter sup-
porting flanges, the cutters, and clamps for holding the cutters, of the spindle
detachably inserted in the forward end of the stock, said spindle being provided
with cutters on its forward end, substantially as described and set forth
Dad thin 10th day of Mol 1900
S. S. BROMHEAD,
Patent Agent, 171, Queen Victoria Street, London, EC