An Improved Holder for Tapping, Drilling, and similar Tools, Applicable also for Screwing Studs in Place.
Year: 1888

page_text: Date of Application, 3rd May, 1888
Complete Specification Left, 4th Feb., 1889
Complete Specification Accepted, 3rd May, 1889
An Improved Holder for Tapping, Drilling, and similar Tools,
Applicable also for Screwing Studs in Place.
1, WALTER PAYTON of Brooklyn House Larkfield Richmond in the County of
Surrey Engineer, do hereby declare the nature of this invention to be as follows:-
The said holder consists of a chuck having one of its ends formed into a shaft and
fitted within the end of the rotating spindle of a drilling or other suitable machine
and its other end bored out cylindrically in order to receive a tool stock which is
accurately fitted within it and in such a manner that the stock may rotate truly with
the spindle of the machine.
The chuck has a slot cut in its side parallel with its axis and the tool stock is
provided with a lug or driver fitted within the slot. The stock is held within the
chuck by a spring arranged in such a way as will permit of the stock being moved up
or down the chuck but will not allow of its falling out of it when the chuck is in a
vertical position.
The tool stock has its lower end bored out to receive the cutting and studding tools
and it is provided with a feather set screw or other suitable means for securing the
tools within the stock.
The upper part of the stock is reduced in diameter and over it is fitted a helical
spring the lower end of which abuts against the enlarged part of the stock and its
upper end against a ring fitted upon the reduced part of the stock and the ring is
pressed by the spring against a crosshead which is screw fitted upon the upper end of
the stock so as to be capable of being screwed a short distance up or down the stock
for the purpose of varying the pressure of the spring upon the ring.
The crosshead is provided with a set screw or other suitable means for preventing it
turning upon the stock after the strength of the spring has been adjusted and the Yug
or driver which is fitted within the slot of the chuck is formed upon or as part of the
ring.
The surfaces of the crosshead and the ring which are in contact are not formed as
planes but as curves and they are made to lie one within the other in such a way that

page_text: the ring is prevented turning upon the stock without at the same time compressing the
spring and the resistance to the turning of the ring so caused is arranged to be such
as will permit of the stock being carried round by the chuck during such times as the tap
is cutting a screw thread but will at the same time be insufficient to prevent the chuck
turning the ring upon the stock should the tap by bottoming in the hole or otherwise
be in danger of being injured or broken. When using the tool as a tapper the tap is
pressed into the hole with sufficient force to make it commence cutting the thread,
the tap is then left to run down the hole of itself and in doing so it will draw the stock
from the chuck till such time as the ring by turning upon the stock has ceased to
rotate it. On reversing the machine the ring and crosshead will again become
engaged; the tap will be withdrawn from the hole and the stock will be pressed back
again into the chuck.
The tool by means of which the studs are fixed in the holes is fitted to the stock in
the same way as the taps and drills and it has its lower end screwed and fitted with a
socket into which the studs are screwed and the tool is used for studding in the same
way as for tapping. The tools for rounding the ends of the studs may be
rosebits, half bits or any other kind of tools suited for giving to the stud the required
shape.
Dol 1
A
$17000

page_text: An Improved Holder for Tapping, Drilling, and similar Tools,
Applicable also for Screwing Studs in Place.
I, WALTER PAYTON of Brooklyn House Larkfield 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 made to the accompanying sheet of drawings
in which :-
Figs. 1 and 2 are vertical sections on lines A and B Fig. 3.
Fig. 3 is a horizontal section on line C Fig. 2. Figs. 4 and 5 are similar sections
on lines D and E and Figs. 6 and 7 and 8 and 9 illustrate separately two parts of the
invention. Parts of the said sections are shown in elevation or plan.
In the said Figures the holder is shown as arranged for tapping holes and for
screwing and fixing studs in them a being a cylindrical chuck having its upper end
formed into the shank a¹ fitted into and secured in the usual manner in the end of
the spindle of a drilling or other machine capable of rotating it in reverse directions.
The body of the chuck a is bored out cylindrically for the greater part of its length
concentrically with the axis of the said spindle, and it has the slot a cut in its side
parallel with its axis for the purpose of receiving and rotating the stock to which the
tapping studding or other tools are fitted.
The lower end of the body part b of the tapping and studding stock is turned to fit within
the chuck a at b¹ and it is enlarged at & to act as a stop to prevent its being pressed
too far into the chuck a. Its centre is bored out at b* and 6 and it has at a rect-
angular slot cut through it at a right angle to its axis and the shanks of the tapping
and studding tools are turned to fit within the bored parts and are formed with flat
parallel sides fitted between the vertical sides of the slot in order that the part b
may serve as a wrench and compel the said tools to rotate truly with it.
The tools are secured to the part 6 by means of the set screw c.
The upper end of the part 6 is reduced in diameter and has the screw thread be and
the groove b' formed upon it and the crosshead d shown separately by Figs. 6 and 7
is made so as to move freely upon such reduced part but is prevented turning upon it
by the feather d¹ engaging in the groove b².
The part 6 has also fitted so as to move freely upon it the concentric ring e shown
separately by Figs. 8 and 9 the circumference of which is shaped to fit freely within
the chuck a and is provided with the lug e¹ fitted freely in the slot a² and projecting
through it.
The under part of the ring e is reduced in diameter and has fitted freely upon it
and abutting against it the upper end of the helical spring f the lower end of which
is centred upon and abuts against the enlarged end of the part b.
The screwed end of the part 6 has fitted upon it the adjusting piece g the purpose
of which is to cause the spring fto press the crosshead d and the ring e together with
a pressure varying with its position on the part b.

page_text: The adjusting piece g is formed with flat sides to facilitate its being turned and to
prevent its being slacked back by vibration when the tool is in use its under surface
is slightly curved so as to fit in a corresponding groove formed in the upper surface
of the crosshead d. The crosshead d has each of its two sides d' and d formed as
tangents to the dotted circle shown in Fig. 6. They are not parallel but at an
angle to each other, and they have their lower edges slightly curved as shown in
Fig. 2. The upper surface of the ring e is formed with a recess having its sides e
and es also formed as tangents to the dotted line shown on Fig. 8 and they correspond
to the tangents and d³ of the crosshead d and allow of the crosshead lying in the
said recess and being pressed into it by the helical spring f. The sides e² and e³ of the
recess in the ring e have their ends angled and the upper edges e and e' of such
angled parts are tangents similar to those formed by lines e and e³ and all intermediate
parallel lines between them are similar tangents. The surfaces of the angled parts
are therefore not planes but are waved in such a way that the tangential edges of the
crosshead d when in contact with any part of them will touch them along their
whole length.
The said angles should be as obtuse as will just permit of the crosshead rising up
them and out of the recess against the pressure of the spring f when a turning motion
is given to the ring e. upon its axis b, and such angles can be readily shaped by fileing
them till such times as colouring matter placed upon the edges of the crosshead has
marked the whole of their surfaces when the parts are in position and are moved upon
each other. The sides of the crosshead d and those of the recess in the ring e may be
made parallel, but it is preferred to make them at an angle to each other as above
described, as by so doing the wear and tear caused by the motion of the crosshead in
and out of the recess against the pressure of the spring will be reduced one half, it
being only possible when so constructed for the crosshead to enter the récess and be
raised ut of it once for each revolution of the ring e on its axis, instead of twice as
would' the case if the said sides were made parallel.
The tapping and studding stock so constructed when required for use is placed in
the chuck a as far as it will go, and it is held within it when in a vertical position by
the helical spring h and the thumb nut h¹ which are placed upon the projecting
screwed end of the lug e¹ and press the washer against the outer surface of the
chuck with sufficient force for that purpose and allow at the same time of the stock
being readily moved in and out of the chuck.
The stock may however if preferred be held within the chuck by means of a helical
tension spring or an ordinary spring balance having one end attached to the projecting
end of the lug e and the other end connected by a stud or hook to the driving spindle of
the machine, but when such springs are used their range of motion must be such as will
allow of the stock being drawn out of the chuck a distance sufficient for tapping holes
of a maximum depth.
When the stock is placed in the chuck the lug e' in the slot a² will act as a driver
to the stock and compel the chuck and it to rotate together for so long a time as the
crosshead d remains in the recess of the ring e, but when the rotation of the stock is
prevented by friction or obstruction the crosshead will be raised out of the recess by
the angled parts of the ring and the ring and the chuck will rotate without giving
motion to the remaining part of the stock. As the raising of the crosshead out of the
recess in the ring e is always resisted by the spring f its pressure must be varied by
turning the adjusting piece g to adapt it to the size of the tapping or studding tool
about to be used.
In doing this care should be taken not to put more pressure on the ring than is
necessary to ensure the turning of the stock by the chuck when the work of tapping
or studding is being done. In order to tap a hole the parts are arranged and
placed in the driving machine in the manner above described and set in motion
and the tap is pressed by the usual hand feed into the hole. When the thread
has started, the hand feed is discontinued and the tap left to draw, the stock out
of the chuck and feed itself down the hole.
When the tap has bottomed or from any other cause can no longer be turned it is

page_text: saved from breakage by the crosshead which by rising out of the recess in the ring e
will allow the chuck to revolve without driving the stock.
In order to insert and fix a stud the studding tool shown in position in Fig. 2
has a stud screwed into the socket at its end and it is used in the same manner
as that above described for tapping. When a stud is fixed or a hole has been
tapped reversing the machine will withdraw the tap from the hole or unscrew the
socket from the stud and in doing so will press the stock back into the chuck.
The angular surfaces formed upon the sides e² and e³ of the recess in the ring e
may obviously be formed upon the corresponding edges of the crosshead & instead
of upon those of the ring and if prefered the crosshead d may be screw-threaded to
fit the screwed end of the part 6 and be provided with a set screw engaging in the
67 so as to prevent the crosshead turning upon the part
when in use..
In this modification the feather in the crosshead and the adjusting piece g are not
required.
groove
The stock may be fitted with rounding off or other cutting tools if desired or
the tapered socket of ordinary twist drills may be fitted to the chuck a and be
secured within it in the same manner as the stock.
The chuck a may be formed as part of the rotating spindle of a drilling or
similar machine having reverse motions or the chuck may be held and the work
rotated instead of the chuck should it be found desirable to do so.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I would have it understood
that I am aware that there is no novelty in a shaft divided into a driving and
a driven part connected by two interlocking bosses or discs pressed together by a
helical spring in such a manner as will allow of the driven part becoming dis-
connected from the driving part when the resistance to the turning of the former
becomes greater than the pressure of the spring as to my knowledge such a device
has been in extensive public use for more than fourty years. I therefore make no
specific claim to the use of such a combination of parts but I now declare that what I
do claim is
1st. The combination of mechanism substantially as hereinbefore described and
illustrated by the Figs. 1 to 9 upon the accompanying sheet of drawings and for
the purposes specified.
2nd. The combination of the chuck a with the several parts forming the stock as
above described with reference to Figs. 1 to 9 and for the purposes set forth or
any modification of such parts.
3rd. The peculiar formation of each of the parts d e and g substantially as herein
described and illustrated by the drawings and for the purposes specified.
4th. The combination of the slot and the bored out parts 63 and 6 of the
part 6 and the set screw c or its equivalent as set forth and for the purposes herein
described and illustrated by the drawings.
5th. Constructing the shanks of the tapping and other tools with parts corresponding
to the bored out parts 6 6 and the slot whereby they are made to fit and be secured
within the part 6 substantially as above described and illustrated by Figs. 1, 2, and 5
of the drawings.