An Improved Holder for Drilling, Tapping, and similar Tools, applicable also for Securing Studs in Place.
Year: 1891

page_text: Date of Application, 9th Feb., 1891
Complete Specification Left, 9th Nov., 1891-Accepted. 12th Dec.. 1891
PROVISIONAL SPECIFICATION.
An Improved Holder for Drilling, Tapping, and similar Tools,
applicable also for Securing Studs in Place.
I, WALTER PAYTON, of 77 Sheen Park Richmond in the County of Surrey,
Engineer, do hereby declare the nature of this invention to be as follows:-
The said invention relates to that kind of tool holder for which Letters Patent
for the United Kingdom were granted me on May 3rd 1888 and numbered 6630,
and it has for its object the construction of such a tool holder in a manner that will
allow of the rotating motion of the tools being reversed without having to reverso
the motion of the machine by which the tools are rotated.
In carrying the said invention into effect the body of the tool holder is divided
into an upper and lower part coupled together by a washer and nut or in any other
way that will permit of their turning one upon the other but without end motion
and the said two parts have fitted or formed upon them a toothed mitre wheel each of
which has its face parallel to and opposite that of the other:
The part between the two mitre wheels is made cylindrical so as to form an axis
for a sleeve to turn upon and on one side of the sleeve a pin is formed to serve as
an axis for a third toothed mitre wheel lying at a right angle with each of the other
two wheels and having its teeth in gear with both of them.
On another side of the sleeve is pivotted a lever having one of its ends
engaging with an inclined stop fixed upon and projecting from the third mitre
wheel carried by the sleeve and the other end of the lever is upheld by an
adjustable helical spring resting upon an abutment formed upon another side of the
sleeve.
The inclined part of the projecting stop and the end of the lever in contact with
it are arranged in relation to each other in such a manner that the wheel upon
which the stop is fixed will when turning upon its axis be compelled to lift that part
of the lever above the stop in order that the stop may pass it and the purpose of
the adjustable spring at the other end of the lever is to provide a greater or less
resistance to the stop in its effort to so pass it.
The upper part of the body of the tool holder is formed into a shank in order
that it may be fitted into the end of the spindle of the machine by which the tool
holder is to be rotated and it is so fitted that the axis of the two coupled parts of
the tool holder and the axis of the machine spindle are in line in order that they
and the spindle may run truly together.
The lower part of the tool holder has its centre bored out for the greater part
of its length and it has a slot cut in it in a line parallel with its axis and within it
is fitted a stock the centre of which is bored out to receive the shanks of twist
or other drilling tools and the stock is provided with a thumb-screw for screwing it
in place.
The said lower part is also fitted with a stock the lower end of which is bored
out and slotted so as to receive and act as a wrench for turning screw tops and
tools for securing studs in place and the stock is provided with a spring catch
for holding such parts securely and it is rotated by means of a feather fitting in the
said slot.
This stock is not fixed in such lower part but is held within it by means of an
adjustable spring in such a way as will permit of its being moved up and down it
when a hole is being tapped or a stud is being fixed in it.
When the tool holder is being rotated by the driving machine for the purpose of
drilling tapping or fixing studs the wheel upon the sleeve is prevented turning by
the action of the lever as above described and the whole of its parts revolve

page_text: together till such times as the drill tap or stud can no longer be turned in the hole
in which case the lever if the strength of its spring be properly adjusted will be
lifted by the stop and as the upper part of the tool holder and the sleeve
will then, become free to turn without giving motion to its lower part the drill
or tap contained in it will not be broken or the stud will be securely fixed in
place.
In order to facilitate the use of tools of different sizes each tool is provided with
a separate and suitably adjusted spring mounted upon a screwed pin having a nut
and washers for the purpose of adjustment and such pins are held in place
upon the sleeve by means of a thumb screw carried by the lever or sleeve in
a way that will permit of the springs being readily put in place when the tools are
changed.
When a hole has been tapped or a stud has been secured in it the motion of the
tool holder has to be reversed and this is effected by stopping the motion of the
sleeve as in that case the mitre wheel carried by it becomes a driving instead of
an idle wheel and gives to the lower part of the tool holder a motion contrary to
that of its upper part and in the direction required for unscrewing the tap or
studding tool. This stoppage of the motion of the sleeve may be effected in
various ways according to the nature of the driving machine but when an ordinary
radial drilling machine is employed it is preferred to use a rod or bar located
on one side of but parallel with its driving spindle fitted in a guide and coupled to
the spindle in a way that will allow of the rod or bar being moved up or down by
the spindle but without being rotated by it and having pin-jointed upon it a lever
capable of being brought into contact with a projecting part of the sleeve or lever
for the purpose of stopping the sleeve's rotation or of being withdrawn from it.
when the contrary is required.
Dated this 0th day of February 1891
WALTER PAYTON.
COMPLETE SPECIFICATION.
An Improved Holder for Drilling, Tapping, and similar Tools,
applicable also for Securing Studs in Place.
I, WALTER PAYTON of 77, Sheen Park Richmond in the County of Surrey,
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, reference being had to the accompanying sheet of
drawings on which
Fig. 1 is a vertical section. Fig. 2 a section on line A.
Figs. 3, 4, 5 side views of the sleeve c.
Figs. 6 & 7 an elevation and plan of the stock k and
Fig. 8 a section on line B.
In Fig. 1 the stock is shown containing a screw tap and in Fig. 6 a studding
tool.
The body of the said tool holder is divided into the upper part a and the lower
part and such two parts are coupled together by the headed pin a' as shown in
Fig. 1 so as to be free to turn upon each other but without end motion.
The part a has formed upon it the toothed mitre wheel a¹ and a similar mitre
wheel is formed upon the lower part b.
The cylindrical part of a lying between the said mitre wheels has fitted upon it
the revolving sleeve c upon which is formed the axial pin c¹ which has fitted upon
it the mitre wheel d which is similar to the wheels formed upon the parts a and b
and gears with both of them. The wheel d is held upon its axial pin by the
collar d' and it has secured upon it the bar d² one end of which projects beyond the
circumference of the wheel at d³.
The side D of the sleeve c is recessed to receive the lever e which pivots upon

page_text: the screwed pin e¹ and is free to move in the recess through a short arc and one
end of the lever is made to have contact at d³ with the end of the bar d² for the
purpose of obstructing the motion of the wheel & upon its axis.
The sleeve c has its side E cut away to make room for the helical spring which
is held between the washers g' and 3 mounted upon the pin g3 which is screwed
and provided with the adjusting nut g' for the purpose of varying the strength of
the spring 3. The pin g is squared at one end so as to fit within a recess formed
in the sleeve at and the other end of the pin is centred so as to engage with the
pointed end of the adjusting screw h carried by the lever e and the purpose of the
spring g is to hold the lever e against the end of the bar d² with a pressure that
may be varied as desired by means of the adjusting nut.
The upper part a is provided with a shank a which has to be fitted to the
spindle of the driving machine and the lower part has its centre partly bored out
and its side slotted to receive the stock k and its feather . The stock k is made
free to move up or down the part but as it is prevented turning within it by the
feather the stock will partake of any rotatory motion that may be given to b.
The stock is prevented falling out of 6 when in a vertical position by a helical
spring which presses the pin A against the inner side of with a pressure that may
be varied by turning the thumb screw k³.
The lower part of the stock k is bored out and slotted in order to receive
the screw-taps and studding tools in a manner similar to that described by me
in the Specification of my Letters Patent No. 6630 A.D. 1888 but I prefer to hold
them in place by using the spring catch m as illustrated in Figs. 1 and 8.
When the tool holder is placed in the driving machine and ready for use the
lever e will be pressed by its spring against the bar d² in the manner shown by
Fig. 5 and will thereby prevent the wheel d turning upon its axis and compel the
two parts a and b and the sleeve to rotate together and in the same direction.
This will obtain so long as the pressure of the lever e upon the wheel dis greater
than the work being done by the part b, but as soon as the pressure of the lever e
becomes less than that required to drive the part b the bar d² will pass under the
lever e and allow the wheel d to turn upon its axis and upon the wheel b' in which
case the upper part a will no longer give motion to the part or the screw tap
contained in it.
A separate helical spring with the parts for adjusting it is provided to suit each
sized tap and as such springs when once adjusted will require no further attention
they can be placed in position and changed with great facility and in much less
time than is required to adjust a spring which is used for taps of all sizes each time
a tap is changed for one of a different size.
The use of a separate spring for each tap also enables the tool-holder to be used
for taps of a much greater number of sizes than is the case when only one spring is
used for taps of different sizes.
The manner of using the tool-holder is similar to that described in the Specifi-
cation of my above recited Letters Patent, but in order to unscrew a tap from a
hole it will not be necessary to reverse the motion of the driving machine as in
lieu of that it is only required to stop the motion of the sleeve c as in that case
the middle wheel d will become a driver and compel the lower wheel b' to turn the
part in a direction the reverse of that of the part a and by so doing unscrew the
tap from the hole without altering the direction of the driving machine.
The means to be used for stopping the motion of the sleeve c will necessarily
vary with the kind of driving machine used but a convenient arrangement for that
purpose is illustrated by Fig. 1 in which n is the driving spindle containing the
tool holder and o a rod carried upon the spindle by means of the projecting part o' in
the manner shown. The upper part of the rod o is fitted in guides fixed upon the
saddle in which the spindle revolves in such a way that the rod o may be carried up
and down by the spindle but without revolving with it.
Upon the lower end of the rod o is fitted the sleeve p provided with the
handle p' and the stop-piece p³ and by turning the sleeve partly round upon the

page_text: rod the stop p will either engage with the end e² of the lever e so as to prevent it
and the sleeve e revolving with the spindle or be disengaged from it and allow the
sleeve to so revolve.
By stopping or freeing the sleeve in this or a similar manner the lower part b of
the tool-holder and any tools contained in it can be caused to revolve in either
direction without altering the motion of the driving machine.
Drills and other cutting tools may be fitted to the stock k or any other kind of
stock may be fitted to the part b for the purpose of receiving and driving such
cutting tools.
Having now particularly described and ascertained the value of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is,
First. The combination comprising the parts a and the sleeve e the wheel d
the bar the lever e and the helical spring g, or any mere modification of them,
all arranged and operating substantially as herein set forth and for the purposes
intended.
Second. The tool-holder illustrated by the 8 Figures of the drawing consisting
of the various parts constructed combined and operating as above described and for
the purposes specified.
Third. The tool-holder illustrated in the drawings and constructed as above
described or any modification of it in combination with a driving machine provided
with any suitable means for stopping the motion of the sleeve e when it is desired to
reverse the motion of the tool contained in the part b.
nated thin 0th day of November 1801
WALTER PAYTON.