IMPROVEMENTS IN GIVING MOTION TO DRILLS
Year: 1852

page_text: LETTERS PATENT to Robert Griffiths, of 25, Great Ormond
Street, in the County of Middlesex, for the Invention of
"IMPROVEMENTS IN GIVING MOTION TO DRILLS."
Sealed the 7th June 1853, and dated the 24th December 1852.
PROVISIONAL SPECIFICATION left by the said Robert Griffiths
at the Office of the Commissioners of Patents, with his
Petition, on the 24th December 1852.
I, ROBERT GRIFFITHS, of 25, Great Ormond St., in the County
of Middlesex, do hereby declare the nature of the said Invention
for "IMPROVEMENTS IN GIVING MOTION TO DRILLS" to be as follows: -
This Invention consists of applying a circular ratchet surface to
the handle, and a similar circular ratchet surface to the socket of
the drill; the two ratchet surfaces being constantly pressed towards
each other by springs, by which, when the handle is moved in one
direction, the teeth of the ratchet surfaces will interlock, and motion
will be given to the drill, whilst in the back motion of the handle

page_text: SPECIFICATION in pursuance of the conditions of the Letters
Patent, filed by the said Robert Griffiths in the Great Seal
Patent Office on the 22nd June 1853.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I,
ROBERT GRIFFITHS, of 25, Great Ormond Street, in the County of
Middlesex, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-fourth day of December, in
the year of our Lord One thousand eight hundred and fifty-two,
in the sixteenth year of Her reign, did, for Herself, Her heirs and
successors, give and grant unto me, the said Robert Griffiths,
Her special licence that I, the said Robert Griffiths, my executors,
administrators, and assigns, or such others as I, the said Robert
Griffiths, 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 GIVING MOTION TO DRILLS," upon
the condition (amongst others) that I, the said Robert Griffiths,
by an instrument in writing under my hand and seal, 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.
I NOW KNOW YE, that I, the said Robert Griffiths, do hereby
declare the nature of the said Invention, and in what manner the
same is to be performed, to be particularly described and ascer
tained in and by the following statement thereof (that is to say):

page_text: This Invention consists of applying a circular ratchet surface
to the handle, and a similar circular ratchet surface to the socket of
the drill, the two ratchet surfaces being constantly pressed towards
each other by springs, by which, when the handle is moved in one
direction, the teeth of the ratchet surfaces will interlock, and motion
will be given to the drill, whilst in the back motion of the handle.
the ratchet teeth of the one ratchet surface will rise and pass back
over the ratchet teeth of the other ratchet surface.
My improvement consists in the employment of crown ratchet
wheels in the ratchet brace in such a manner that all the teeth of
the ratchet wheels are in gear at the same time, by which means a
great increase of strength is obtained, and which are entirely
enclosed in the handle of the ratchet brace,. as shewn in the
Drawings.
DESCRIPTION OF DRAWINGS.
Figure 1, is a side view, one half full size of a ratchet brace, with
my improvements applied; Figure 2, a longitudinal section of the
same; Figure 3, a section in plan; Figure 4, the drill stock with
the fixed ratchet wheel formed upon it; Figure 5, the moveable
ratchet wheel which slides upon the drill stock within the handle, and
being hexagon, as shewn in Figure 3, is moved by it, and is pressed
downwards towards the fixed ratchet by means of the coiled spring,
as in Figure 2; Figure 7, is a side view of another form of ratchet
brace, by which I give a continuous motion to the drills by means
of the bevil wheels in conjunction with two sets of crown ratchet
wheels; Figure 6, longitudinal section of ditto; Figure 8, section
in plan; Figure 9, drill stock, shewing two fixed ratchet wheels,
one being formed upon the stock, and the other secured upon it, and
fixed by means of a small screw passing partly through the wheel,
and partly through the stock; Figure 10, the moveable ratchet
wheels which slide upon the stock within the bevil wheels, and
partake of their motion as in the former case, and are pressed
towards their respective fixed ratchets by the coil spring shewn
between them.

page_text: Having thus described my Invention, and the manner of per-
forming the same, be it understood that I do not confine myself to
the exact details herein described, so long as the peculiar character
Invention is retained. But what I claim is, the employment
of crown ratchet wheels in ratchet braces, or instruments employed
in giving motion to drills, as herein described.
of
my
In witness whereof, I, the said Robert Griffiths, have hereunto
set my hand and seal, this Twenty-first day of June,
in the year of our Lord One thousand eight hundred and
fifty-three.
Witness,
JNO. ALCOCK.
ROB GRIFFITHS. (L.S.)