IMPROVE- MENTS IN HOLDING DEVICES FOR BORING TOOLS
Year: 1866

page_text: LETTERS PATENT to Thomas Adam Mathieson, Tool Manufacturer, of
Glasgow and Edinburgh, North Britain, for the Invention of "IMPROVE-
MENTS IN HOLDING DEVICES FOR BORING TOOLS."-A communication from
abroad by Cyrus Avery, residing at Tunkhannock, United States of
America.
Sealed the 7th September 1866, and dated the 12th March 1866.
PROVISIONAL SPECIFICATION left by the said Thomas Adam Mathieson
at the Office of the Commissioners of Patents, with his Petition, on the
12th March 1866.
I, THOMAS ADAM MATHIESON, Tool Manufacturer, of Glasgow and.
Edinburgh, North Britain, do hereby declare the nature of the said Invention
for "IMPROVEMENTS IN HOLDING DEVICES FOR BORING TOOLS," a communication
to me from abroad by Cyrus Avery, residing at Tunkhannock, United States
of America, to be as follows, that is to say :-
This Invention bas for its object the providing of boring tools with simple,
convenient, and durable devices for holding them in their stocks, handles, or
spindles.
In carrying the Invention into effect a slot is formed through or across the
socket which is formed on the stock, handle, or spindle to receive the tang of

page_text: the boring tool; a loose spring key, made by preference of steel, is fitted to
slide in the slot, and is formed with an opening, through which the point of
the tang passes when the tool is entered into the socket. A rectangular
groove or notch is formed in one side of the tang of the tool so as to coincide
in position with the spring key when the tool has been pushed home, and on
the key being pushed into this notch it holds the tool securely, being itself
prevented from shaking out by a slightly enlarged part at the other end of it
catching by its spring action on the further edge or corner of the slot in the
socket. Whilst no strain in working can loosen the key if the parts are
properly fitted a slight pressure of the finger or thumb on the end of it is
quite sufficient to do so when it is wanted to take out the tool. The precise
form of the parts may be varied, but the device differs essentially from ordinary
holding details for such tools in having a loose key with a comparatively slight
spring detent action to hold the key in position, instead of a mere catch, which
requires a strong spring to keep it in position, and which is rapidly worn by
the strain required to overcome this spring when changing the tool.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Thomas Adam Mathieson in the Great Seal Patent Office on
the 11th September 1866.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, THOMAS
ADAM MATHIESON, Tool Manufacturer, of Glasgow and Edinburgh, North
Britain, send greeting."
WHEREAS IIer most Excellent Majesty Queen Victoria, by Iler Letters
Patent, bearing date the Twelfth day of March, in the year of our Lord One
thousand eight hundred and sixty-six, in the twenty-ninth year of Iler reign,
did, for Herself, Her heirs and successors, give and graut unto me, the
said Thomas Adam Mathieson, Her special licence that I, the said Thomas
Adam Mathieson, my executors, administrators, and assigns, or such others as
I, the said Thomas Adam Mathieson, my executors, administrators, and assigns,
should at any time agree with, and no others, from time to time and at all
times thereafter during the term therein expressed, should and lawfully
might make, use, exercise, and vend, within the United Kingdom of Great
Britain and Ireland, the Channel Islands, and Isle of Man, an Invention
for "IMPROVEMENTS IN HOLDING DEVICES FOR BORING TOOLS," (a communication
to me from abroad by Cyrus Avery, residing at Tunkhannock, United States
of America), upon the condition (amongst others) that I, the said Thomas

page_text: Adain Mathieson, my executors or administrators, by an instrument in writing
under my, or their, or one of their hands and seals, should particularly describe
and ascertain the nature of the said Invention, and in what manner the same
was to be performed, and cause the same to be filed in the Great Seal Patent
Office within six calendar months next and immediately after the date of the
said Letters Patent.
NOW KNOW YE, that I, the said Thomas Adam Mathieson, do hereby
declare the nature of any said Invention, and in what manner the same is
to be performed, to be particularly described and ascertained in and by the
following statement in writing, reference being had to the accompanying
Drawings, that is to say:-
The said Invention has for its object the providing of boring tools with
simple, convenient, and durable devices for holding them in their stocks,
handles, or spindles.
And in order that the said Invention, and the manner of performing the same,
may be properly understood, I have hereunto appended a Shect of explanatory
Drawings, to be herein-after referred to, and representing boring braces with
the improved holding devices applied to them. In the said Drawings the
same reference numerals are used to mark the same or like parts in all the
Figures.
Figure 1 is a side elevation of the socket or pad end of a wooden brace, an
end view being shown immediately above it; Figure 2 is a vertical section
taken as at the line a, a, in Figure 1; Figure 3 is a cross section showing
the holding device or key in position; Figure 4 is a face view of the key as
detached; and Figure 5 is a longitudinal section of the key; Figure 6 is a
side elevation of an iron brace; and Figure 7 is a view showing the manner of
holding the brace and of manipulating the key when entering or removing a
bit or tool.
In carrying the Invention into effect the pad or end 1, in which is formed
the socket or recess 2 to receive the tang 3 of the bit or tool, is made with a
slot 4 through or across it. A movable spring key 5, shown detached in
Figures 4 and 5 and made by preference of spring steel, is fitted to slide in the
slot 4, and has an opening formed in it, through which the point of the tang 3
pas-es when the bit or tool is entered into its socket 2. A rectangular
groove or notch 6 is formed in one side of the tang 3 of the bit so as to
coincide in position with the spring key 5; when the bit has been pushed
home, and on the key 5 being pushed inwards it enters the notch and holds
the bit securely. The key 5 is slit at one end, and the two sides are set so as
to tend to spring outwards, and when the key is in its slot 4 the spring ends

page_text: exert a pressure on the sides of the slot, which prevents it from shaking back-
wards. The slot 4 may be made of equal width at both ends; if, however, it
is wished to increase the resistance to shaking back, the slot may be slightly
enlarged at the end corresponding to the split end of the key, or the corners
of the key may be slightly enlarged so as to catch on the edges or corners of
the slot. Whilst no strain in working can loosen the key if the parts are
properly fitted, a slight pressure of the finger or thumb on the end of it is
quite sufficient to do so when it is wished to take out or insert the bit or tool.
For this purpose the brace is held in the left hand, as shown in Figure 7,
and the thumb is applied to the split end of the key 5 to push it across.
This makes the socket 2 clear, and the bit can be taken out or inserted by
the right hand. After inserting the bit the key 5 is pushed back by the fore-
finger.
The precise form of the parts may obviously be varied, but the device
differs essentially from ordinary holding details for such tools in having a
movable key with a comparatively slight spring detent action to hold the key
in position, instead of a mere catcb, which requires a strong spring to keep it
in position, and which is rapidly worn by the strain required to overcome this
spring when changing the tool or bit. The improved device is obviously
applicable for holding boring tools in sockets in various kinds of, stocks,
handles, or spindles.
Having thus particularly described the said Invention, and the manner in
which the same is to be performed, I have to state that the Inventor does not
restrict himself to the precise details herein described or delineated, but that
what I claim as the Invention secured to me by the herein-before in part
recited Letters Patent is, the fitting of boring tools with holding devices,
substantially such as are herein described and delineated.
In witness whereof, I, the said Thomas Adam Mathieson, have hereunto
set my hand and seal, this Eighth day of September, in the year of
our Lord One thousand eight hundred and sixty-six.
Witness,
EDMUND HUNT,
Patent Agent,
Glasgow.
THOS. A. MATHIESON. (L.S.)