Improvements in Tapping and Screwing Machines, which can also be Used for Drilling.
Year: 1894

page_text: Date of Application, 3rd Mar., 1894
Complete Specification Left, 3rd Dec., 1894-Accepted, 12th Jan., 1895
PROVISIONAL SPECIFICATION.
Improvements in Tapping and Screwing Machines, which can also
be Used for Drilling.
I, FREDERICK HENRY ROYCE, of the Firm of F. H. Royce and Co., Cooke
Street, Hulme, Manchester, in the County of Lancaster, Electrician, do hereby
declare the nature of this invention to be as follows:-
:-
The improvement which forms the subject of this invention relates to a method
of driving, stopping and reversing the tap, screwing die or such tool, the chief
object being to make a combined tapping and drilling machine.
The spindle A wbich carries the tap, die or tool holder B, is driven in either
direction by means of two pulleys C and C¹, running in opposite directions, each
carrying upon its boss one or more teeth forming a clutch D and D', which engage
into similarly formed teeth E and E', fixed upon a sleeve F through which passes
the spindle A carrying the tap, die or tool holder, and which sleeve F is free to
move vertically upon the spindle A but is compelled to rotate with it in any
direction it may be turned in consequence of a feather. O.
The spindle A is controlled in the usual manner as in a vertical drilling machine,
and upon being brought to its highest point moves the sleeve by means of the
adjustable collar M, which is, although adjustable always attached in some definite
position on the spindle A, into such a position that the teeth or clutch E engage
upon the teeth or clutch D upon the pulley C which drives the spindle in a
direction for driving the tap into the work, and when in this position the catch G,
which is of bell crank form, pivotted at the angle P, engages with the step H
which is a vertical guide connected to and controlling the spring K.
The spring K is arranged to pull the clutch apart i.e. to disengage E from D but
the catch G engaging with H prevents this spring from doing so until the tap is
inserted sufficiently far into or through the work, when an adjusting screw L travelling
with the spindle releases the fore-mentioned catch G and allows the spring K to
withdraw the clutch and make it engage with the pulley C¹ running in the reverse
direction so the action of the spring K makes D¹ engage with E¹ thereupon
driving the spindle A in the necessary direction for withdrawal of the tap, die or
tool holder, which upon arriving at its highest point again presses the sleeve F
carrying the clutch E and E' in such a direction as to disengage E' and D' and
make E engage with D on the pulley C running in the direction first described
above, and in this position is ready for performing another cycle or operation.
Should the machine be required for drilling, the screw L is-moved into such a
position that it cannot engage with the catch G, so causing the spindle to rotate
continually in one direction.
Dated this 2nd day of March 1801
1
THOMAS PRESCOTT,
53, Arcade Chambers, St. Mary's Gate, Manchester,
Agent for the Applicant.

page_text: Improvements in Tapping and Screwing Machines, which can also
be Used for Drilling.
I, FREDERICK HENRY ROYCE, of the Firm of F. H. Royce & Co., Limited,
Cooke Street, Hulme, Manchester, in, the County of Lancaster, Electrician, 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 :-
The improvement which forms the subject of this invention relates to a method
of driving, stopping and reversing the tap, screwing die, or like tool in a machine
that may be employed for tapping, screwing and drilling.
The object of this invention is to construct a combined tapping, screwing and
drilling machine. The drawing to which I hereinafter refer left with the Provisional
Specification is a part sectional elevation of a machine constructed according to
my invention in which A is a spindle which carries the tap, die, or tool holder B,
and is driven in either direction as may be required by the means hereinafter
described.
I fit a sleeve F upon the aforesaid spindle A carrying the tap, die, or tool holder,
said sleeve being free to move vertically upon the spindle A but is compelled to
rotate in the same direction as the spindle by means of the feather O. I place
loosely on the aforesaid sleeve F two pulleys C and C₁ that are caused to run in
opposite directions, and are retained in position between two arms or brackets Q
by means of a ferrule F1. I construct the underside of the boss of the top pulley C
and the upper side of the boss of the bottom pulley C¹ with one or more teeth D
and D¹ so as to form a clutch into which similarly formed teeth E and E' formed
on the sleeve F will engage alternately. The spindle A is controlled in the usual
manner as in a vertical drilling machine, and upon being brought to its highest
point moves the sleeve F by means of the adjustable collar M which although
adjustable is always attached in some definite position on the spindle A, said
position being such that the teeth or clutch E engage upon the teeth or clutch D
upon the pulley C which drives the spindle in a direction for driving the tap into
the work, and when in this position the catch G which is of bell crank form and
pivotted at the angle P engages with the step H which is a vertical guide connected
to and controlling the spring K.
The spring K is intended and arranged to pull the clutch apart and disengage E
from D but the catch G engaging with H prevents said spring from effecting this
until the tap is inserted sufficiently far into or through the work, when an adjusting
screw L travelling with the spindle A releases the aforesaid catch G and allows the
spring K to withdraw the clutch E from D and cause E¹ to engage with D' on the
boss of the pulley C₁ that is running in the reverse direction.
By these means the spindle A is driven in the direction necessary for withdrawal
of the tap, die or tool holder, and upon arriving at its highest point again lifts by
means of the collar M, the sleeve Fand the clutch with teeth E and E¹ causing E¹
to disengage from D' and E to engage with D on the pulley C running in the
direction herein first described, the tool in this position being ready for tapping or
screwing.
Friction clutches may be employed in lieu of the clutches with teeth herein
before described.
If the machine is required for the purposes of drilling, the screw L is moved
into such a position that it cannot engage with the catch G, thereby causing the
spindle A. to rotate continually in one direction.

page_text: Having now particularly described and ascertained the nature of this my said
invention, and in what manner the same is to be performed, I declare that what
I claim is :-
1st. In a machine that is employed for tapping, drilling and screwing, the use of
pulleys such as C and C¹ and clutch mechanism in combination with the spindle
that carries the tap, die, or tool holder, in the manner and for the purpose
substantially as herein before described.
2nd. A combined tapping, screwing and drilling machine constructed for the
purpose and in the manner substantially as herein before described.
3rd. A machine that may be employed for drilling constructed substantially as
herein before described.
Dated this 1st day of December 1894
THOMAS PRESCOTT,
53, Arcade Chambers, St. Mary's Gate, Manchester,
Agent for Applicant.
THOMAS PRESCOTT,
53, Arcade Chambers, St. Mary's Gate, Manchester,
Agent for Applicant.