A NEW OR IMPROVED METAL DRILL OR BORING TOOL, AND STOCK THEREFOR.
Year: 1876

page_text: LETTERS PATENT to Edward Thomas Hughes, of the Firm of Hughes and Son,
Patent Agents, 123, Chancery Lane, London, for the Invention of "A NEW OR
IMPROVED METAL DRILL OR BORING TOOL, AND STOCK THEREFOR.'
" A com-
munication from abroad by Jacob Jäggli, at Frauenfold, Switzerland.
aled the 20th March 1877, and dated the 23rd September 187
PROVISIONAL SPECIFICATION left by the said Edward Thomas Hughes at
the Office of the Commissioners of Patents on the 23rd September 1876.
EDWARD THOMAS HUGHES, of the Firm of Hughes and Son, Patent Agents, 123,
Chancery Lane, London. "A NEW OR IMPROVED METAL DRILL OR BORING TOOL, AND
STOCK THEREFOR." A communication from abroad by Jacob Jäggli, at Frauenfold,
Switzerland.
22
This improved drill for iron and other metals is constructed of all sizes, and
made from best rolled and hardened cast steel; it has two even or " cutting
faces," and two hollow faces (concaves). The even face has for dimension the breadth
of the radius, plus the half of the medium thickness of the drill, the other round
face being as large as the radius.
The medium thickness in the middle of the drill has the proportion of 11: 15
of the radius, and the hollow face is formed in such manner that,―
1st. The boring chips or scraps fall directly to the bottom of the hole.
2nd. It gives to the drill the necessary strength and resisting force.
3rd. It serves as guide in the bore hole.
The exterior semicircular face terminates in a small end to give to the drill a light
friction.
The stock for holding the drill consists of the stock or boring head block cast on
the boring engine or secured thereto. This stock or boring head is purchased or
recessed on its lower end for introducing in it the different kinds and sizes of drills,
said boring head being supplied with two cheeks, the one placed opposite the face
of the other, and around these cheeks is placed a band or hoop, in which is turned
side by side of the checks two eccentric openings, which correspond exactly with
the cheek faces. On turning this hoop by means of a hook or key the cheeks will
become fast on the hoop and the drill, and hold the latter firmly in the boring head
or stock.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Edward Thomas Hughes in the Great Seal Patent Office on the 23rd
March 1877.
EDWARD THOMAS HUGHES, of the Firm of Hughes & Son, Patent Agents, 123,
Chancery Lane, London. "A NEW OR IMPROVED METAL DRILL OR BORING TOOL,
AND STOCK THEREFOR." A communication from abroad by Jacob Jäggli, at Frau-
enfold, Switzerland.
This improved drill for iron and other metals is constructed of all sizes, and made
from best rolled and hardened cast steel; it has two even or "cutting faces," two
hollow faces (concaves)", and two curved outer faces. The even faces have for
dimensions the length of the radius plus the half of the middle thickness of the
drill; the hollow faces constitute a continuation of the even faces, and the curved
outer faces measured from the edge of the even face to the edge of the hollow face
has for dimensions the length of the radius.
The middle thickness through the drill bears the proportion to the radius of
115, and the curved outer faces are, arces of circles struck from centres taken on
a circumferential line representing the size of the tool, and opposite to the centre of
said arcs.
The curved outer faces terminate at the edge of the hollow face in "a narrow end
or edge to give to the drill a light friction.
This construction of boring tool ensures,-
(1). That the boring chips or scraps fall directly to the bottom of the hole.
(2). It gives to the tool the necessary strength and resisting force.
(3). It serves as guide in the bore hole.
The stock for holding the drill consists of the stock or boring head block cast on
the boring engine or secured thereto. This stock or boring head is punched or
recessed on its lower end for introducing in it the different kinds and sizes of drills,
said boring head being supplied with two cheeks, the one placed opposite the face
of the other, and around these cheeks is placed a band or hoop, in which is turned
side by side of the checks two eccentric openings, which correspond exactly with
the cheek faces. On turning this hoop by means of a hook or key the cheeks will
become fast on the hoop and the drill, and hold the latter firmly in the boring head
or stock.
In the Drawings hereunto annexed Figs. 1 to 5 inclusive are side views of different
sizes of the improved boring tool; and Figs. 1° to 5º plan views respectively of the
cutting end of the drills shown in Figs. 1 to 5.
Fig. 6 is a vertical section of the stock boring head block; and Fig. 7, a
horizontal section thereof.
I will now proceed to describe the construction of the boring tool, with particular
reference to Figs. 1 and 1ª, in which the various faces are figured and lettered.
The even face 1 extends from the dotted circumferential line at e and h to and is
continued beyond the perpendicular axial line of the drill for the distance of half
the middle thickness of the drill, where it meets or is continued by the hollow face 2,
the curve whereof is struck from the centres indicated by the dotted double arrows,
and terminating at g and k. The outer curved faces lie between the points e, f, and
h, i, and are arcs of circles struck from centres 3, and the said outer faces and hollow
faces 2 terminate in edges lying between the points f, g, and k, i. The middle
thickness of the tool is indicated at d by the small double arrow.
The stock for holding the drills, represented in Figs. 6 and 7, consists of the boring
head A, E, the part A being of a piece with or secured to the boring engine. The
boring head A, E, is formed on its lower end with a hole D for reception of the
drills, and on each side of the said boring head is applied two blocks or cheeks C, C,
opposite to each other, and round these said blocks is placed a band or hoop B,
wherein is turned two eccentric recesses, clearly shown in Fig. 7.
a is a groove in
the boring head A, E; b, a screw; and a¹, a hole.

page_text: When securing the drill in the stock the butt end of the drill is placed in the
hollow D between the cheeks C, C. A hook or key is now placed in the hole a¹ to
turn the band B around, when the outer faces of the cheeks C, C, will slide upon
the excentric faces formed on the inside of said band B, and tighten the inner faces
of the cheeks C, C, on the butt end of the drill, and bind same firmly in the stock.
The screw b is now tightened up, and the drill will be held securely for use.
The following are the advantages arising from the use of this improved boring
tool:-
(1). The entire length of the borer can be utilized without being dressed and
hardened during use.
(2). For about fifteen sizes of drills one stock will suffice.
(3). These drills may be arranged to be used on both ends.
(4). The drill is quickly enclosed and immediately dressed in the right position.
(5). The friction on the drill is reduced to a minimum.
(6). These drills do not wear so rapidly as those now used.
(7). They are comparatively strong in proportion to their weight.
(8). They can be easily ground.
(9). The boring chips leave the bored hole easily, whereby the boring of deep
holes can be executed without heating the drill much, and the lubrication can be
easily effected.
(10). A round and smooth hole is produced.
(11). The tool is very cheap.
Having now described the nature and particulars of the said Invention, I claim,
the new or improved metal drill or boring tool, and stock therefor, substantially as
herein set forth and shewn by the Drawings.
In witness whereof, I, the said Edward Thomas Hughes, have hereunto set
my hand and seal, this Twenty-third day of March, in the year of our
Lord One thousand eight hundred and seventy-seven.
easily effected.
(10). A round and smooth hole is produced.
(11). The tool is very cheap.
Having now described the nature and particulars of the said Invention, I claim,
the new or improved metal drill or boring tool, and stock therefor, substantially as
herein set forth and shewn by the Drawings.
In witness whereof, I, the said Edward Thomas Hughes, have hereunto set
my hand and seal, this Twenty-third day of March, in the year of our
Lord One thousand eight hundred and seventy-seven.