pu of a Cylindrical or other Formation.
Year: 1887

page_text: Date of Application, 10th Aug., 1887
Complete Left, 10th May, 1888
Complete Accepted, 15th June, 1888
Improv pu
of a Cylindrical or other Formation.
I SAMUEL DIXON of the firm of Kendall and Gent of the Victoria Works Spring-
field, Salford, Manchester in the County of Lancaster, Engineers, and Machine Tool
Makers do hereby declare the nature of this Invention to be as follows:-
:-
My said Invention relates primarily to apparatus adapted to be employed in the
drilling of boiler rings and other metal rings and cylinders similar for example to the
apparatus_shown and described in the Specification of an Invention for which I
obtained Her Majesty's Letters Patent No. 1370 of the year 1880. In the said type
of machine the work say for example a boiler ring is placed upon a circular turn-
table and surrounding the turn-table are a certain number (say three) of uprights
carrying sliding headstocks which support the drills. In my improved apparatus I
arrange two drills side by side upon each headstock the drills being capable of being
rotated and advanced and withdrawn simultaneously. The drills are driven from an
upright shaft upon which is a toothed spur wheel sliding on the shaft and rotating
therewith, the said spur wheel gearing with other two similarly toothed pinions carried
on studs which are adjustable in slots radial from the centre of the upright shaft so
that in whatever position the studs may be in the radial slot the pinion wheels are
always in gear with the spur wheel on the upright shaft. Each stud pinion wheel
carries a bevel wheel which gears with a bevel wheel on the horizontal drill spindle.
The two drill spindles lying side by side are thus simultaneously driven by the upright
shaft and the two brackets which support the spindles are secured to and pivotted on
the the headstock by the studs which carry the pinion wheels so that the brackets and
drill spindles can be set apart to suit the required pitch of the holes to be drilled and
to any desired angle the spur wheel on the upright shaft remaining constantly in
gear with the spur pinions. My invention further relates to the feeding forward and
sudden withdrawal of all of the drills simultaneously this rapid and simultaneous with-
drawal of all of the drills effecting a great economy in time. The outer end of each
drill spindle is screwed for a certain distance the said screwed part engaging with a
revolving or revolvable nut carried in a bearing by a fixed bracket. When the drills

page_text: are being fed forward the nuts are caused to revolve in the same direction as the drill
spindles. Of course it is evident that if they revolved at the same speed as the drill
spindles the latter would not be advanced at all. But the gearing by which the nuts
are driven from the spindles is differential so that the nuts revolve at a slightly less
degree of speed than the spindles, the spindles being thus advanced in the nuts at a
rate corresponding to the difference of speed between the nuts and the spindles.
When the drills are to be withdrawn the spindles are reversed and the nuts cease
to revolve with the result that the spindles are simultaneously and quickly withdrawn
at a rate corresponding to their own velocity. The mechanism by which this result is
obtained is as follows. On the screwed end of each spindle is a sleeve carried in a
fixed bracket and driven by a key sliding in a groove in a spindle. This sleeve con-
stitutes a clutch which engages with a second clutch by means of a spring tooth
whereby the said second clutch is driven by the first only when it is revolving in one
direction that is to say when the drills are advancing. The second or driven clutch
carries a toothed spur wheel of a diameter slightly less than that of the spur wheel
on the revolving nut. An intermediate wheel sufficiently broad to engage with
both, keeps them constantly in gear. When the drill is advancing the revolving
nut is driven at a slightly less speed than the drill spindle so that the spindle is
advanced in the nut. When the direction of rotation of the drill spindles is
reversed the nut becomes stationary and the drills are quickly run back to the
required extent. Each drill can if desired be independently withdrawn by operating
a handle fitting on the squared end of the stud carrying the intermediate wheel.
The reversal of the drill spindles is or may be effected by shifting the crossed and
open belts on the driving pullies and shaft which communicates motion to all of the
upright shafts whereby the drill spindles are driven. It will be obvious that the
arrangements for obtaining a quick return of the drill spindles are applicable to
types of drilling machines other than that herein indicated and may be used in the
case of upright as well as horizontal drills.
Dated this ath do of An 1007

page_text: COMPLETE SPECIFICATION.
Improvements in Apparatus for Drilling Boiler Rings and Objects
of a Cylindrical or other Formation.
I SAMUEL DIXON of the firm of Kendall and Gent of the Victoria Works, Spring-
field, Salford, Manchester in the County of Lancaster, Engineers and Machine Tool
Makers 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 and accompanying drawings:
My said Invention relates primarily to apparatus adapted to be employed in the
drilling of boiler rings and other metal rings and cylinders similar for example to the
apparatus shown and described in the Specification of an Invention for which I obtained
Her Majesty's Letters Patent No. 1370 of the year 1880. In the said type of machine
the work say for example a boiler ring is placed upon a circular turn-table and
surrounding the turn-table are a certain number (say three) of uprights carrying
sliding headstocks which support the drills. In my improved apparatus I arrange two
drills side by side upon each headstock the drills being capable of being rotated and
simultaneously advanced slowly and withdrawn quickly.
In order that my said invention may be properly understood I will now proceed to
describe the same more particularly, and with reference to the annexed sheet of
drawings wherein the essential parts of my invention are clearly illustrated.
Fig. 1 is a plan view partly in section of the two drill spindles A supported
on a headstock B which is slid up and down on the upright C by means of a
screw a.
Fig. 2 is a sectional elevation of Fig. 1 at the line x x Fig. 1.
The spindles carry drills D capable of beng removed and replaced as is usual. The
spindles and drills are rotated from an upright shaft E upon which is a toothed spur
wheel F sliding on the shaft E with a slip feather and groove and rotating therewith.
The spur wheel F. gears with other two similarly toothed pinions G. H which are
carried on studs I which are adjustable in slots radial from the centre of the
shaft E, the said radial slots being clearly apparent in Fig. 1. It will be evident
that in whatever position the studs I may be in the radial slots the pinions G. H.
aro always in gear with the spur wheel E on the upright shaft. The pinions G.
and H carry bevel wheels K which gear with bevel wheels L on the horizontal drill
spindles A. The two drill spindles A lying side by side are thus simultaneously driven
by the upright shaft E and the two brackets M N which support the spindles are secured
to and pivotted on the head stock by the studs I which carry the pinions G. H so that
the brackets and spindles can be set apart to suit the desired pitch of the holes to be
drilled and to any desired angle, the spur wheel F on the upright shaft remaining
constantly in gear with the spur pinions G. H. so that the driving connection is
never interrupted.
.
The simultaneous feeding forward of the drills and their sudden withdrawal is
effected in the following manner. The outer end of each drill spindle is screwed as

page_text: shown for a certain distance, the said screwed parts engaging with revolvable nuts O
carried in bearings in the brackets M N. When the drills are at work and are being
fed forward the nuts O are also revolved in the same direction as the drill spindles.
Of course it is evident that if the nuts revolved at the same speed as the spindles the
latter would not be fed forward at all. But the gearing by which the nuts are driven
from the spindles is differential so that the nuts revolve at a slightly less degree of
speed than the spindles, the spindles being thus advanced at a rate corresponding to
the difference of speed between the nuts and the spindles. When the drills are to be
withdrawn the direction of rotation of the spindles is reversed and the nuts cease to
revolve and are held motionless with the result that the spindles are simultaneously
and quickly withdrawn at a rate corresponding to their own velocity and the pitch
of the screw on the spindlo. The mechanism by which these results are obtained is as
follows. On the screwed end of each spindle is a sleeve P carried in a fixed bracket Q
and driven by a slip feather in a groove in the spindle. Upon this sleeve is loosely
mounted a spur wheel R having a sloping groove cut in it opposite to a spring tooth S
which projects from the sleeve P. When the drill spindles are being fed forward, this
spring tooth drives the spur wheel R, but when the rotation of the spindles is reversed
the tooth S slips out of the inclined groove and the spur wheel R remains at rest.
The screwed portion of each spindle also passes through a nut O which is carried in a
bearing in the bracket M or N. On one end of the nut is secured another spur wheel U
having say one tooth more than the spur wheel R. The spur wheels R and U both
revolve in gear with an intermediate pinion V which is broad enough to engage with
both and by which the motion of the wheel R is transmitted to the wheel U and nut O.
When the spindles are at work the sleeve P in revolving drives the wheel R, the
intermediate pinion V, and the wheel U and nut. As the wheel U has one tooth more
than the wheel R its speed of rotation is slightly less than that of the wheel R and as
a consequence the nut O revolves slightly slower than the spindle. The spindle thus
over-runs the nut and is advanced. On the nut O is a collar in which is an inclined
groove opposite to a spring detent W. When the drills are advancing, this detent has
no effect upon the nut O but when the spindles are reversed the detent holds the nut
and prevents it from revolving. At the same time by the reversal of the spindle the
spring tooth S ceases to drive the wheel R so that the nut O and the wheels U. V
and R are all held stationary by the detent. The screwed spindle by thus revolving in
the stationary nut is quickly retracted and on a renewal of the boring operation the parts
again act as already described. Each drill can if desired be independently withdrawn
by operating a handle fitting on the squared end of the spindle Y. The reversal of
the drill spindles is or may be effected by shifting the crossed and open belts on the
driving pullies and shaft which communicates motion to all of the upright shafts E.
The pivotted brackets M. N which carry the drill spindles can be set apart and shifted
to any desired angle by operating the set screws Z which are formed with a right and
left hand thread. These screws may be operated by a key or handle fitting on the
squared ends of the screws.
It will be evident that the arrangements for obtaining a slow feed and a quick return
of the drill spindles are applicable to types of multiple and other drilling machines
other than that herein indicated and may be used in the case of upright as well as
horizontal drills.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
:-
(1) In drilling machines of the indicated type the general construction arrangement
and combination of parts comprising the apparatus for revolving, slowly advancing
and quickly retracting the drill spindles and drills substantially as hereinbefore described
and shown.
•
:
(2) In drilling machines of the indicated type, pivotting the brackets supporting
the drills and drill spindles upon the sliding headstock upon studs which are capable
of adjustment radially to the centre of the driving spur wheel and arranging gearing

page_text: upon
the said studs for transmitting motion to the bevel wheels upon the drill spindles
whereby the position of the brackets and the angle of the drills can be altered without
removing the wheels out of gear, substantially as described and shown.
(3) In drilling machines of the indicated type and in multiple and other drills the
means for advancing the revolving drill spindles and drills slowly and retracting them
quickly and consisting of the nut O spur wheel U. intermediate pinion V spur wheel R
and sleeve P in combination with the spring catches S and W all arranged and acting
substantially as herein before described and shown.
DUTTON & FULTON,
1, St. James Square, Manchester,
Agents.