Improvements in Radial Drilling and Tapping Machines.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in Radial Drilling and Tapping Machines.
I, CHARLES HENRY CLIFTON, of 1150, Cathcart Road, Mount Florida, in the City
of Glasgow, Engineer, do hereby declare the nature of this invention to be as
follows:-
My invention relates to improvements in radial drilling and tapping machines
and especially in the arrangement, combination and construction of mechanism
for giving a slower motion to the spindle when tapping than is used for drilling
purposes, the arrangements of parts being such as to give greater strength and
stiffness to the radial arm, and allow the greatest possible traverse to the saddle
along the radial arm.
Under the invention a short intermediate shaft is carried by the saddle and
traversed with it and is placed outside the radial arm of the drilling machine.
This shaft has two spur wheels at one end which are free to revolve independently
on it, but the shaft is adapted to be coupled to either spur wheel by means of a
clutch which is keyed to and slides on this shaft and can be operated by the move-
ment of a lever to throw either spur wheel into driving gear. These two spur wheels
gear into other two wheels also carried by the saddle, and which are driven by the out-
side main motion shaft, along which they are free to slide when traversed by the
saddle. The two pairs of wheels are geared to give different speeds, one pair being
arranged for a drilling speed, and the other pair of wheels geared to give a slower
speed necessary for tapping the holes when drilled, or for boring large sized holes.
At the other end of the intermediate shaft the reversing wheels are placed, these
consisting of three mitre or bevel wheels, two or which run in opposite directions
and are free to revolve independently of said shaft, the third wheel being fixed
upon a short vertical shaft which drives the spindle by means of spur wheels.
The spindle is driven or reversed by means of a clutch keyed to the intermediate
shaft and which is free to gear into either of the bevel wheels running in opposite
directions upon it.
A cone pulley for a belt feed is fixed to the outside bevel wheel.
In a modification the spur wheels and bevel wheels are loosely fitted on the main
motion shaft on which the clutches are fitted to slide and the spur wheels gear
with like wheels on an intermediate shaft to provide for varying the speed. One
of the spur wheels on the main motion shaft is connected by a sleeve to one of the
bevel wheels so as to rotate with it either at the higher or lower speed according
as the clutch between the spur wheels is made to throw into gear the spur wheel
and sleeve on one side or the loose pinion on the other side which by driving
through the speed reducing or increasing gear serves to vary the speed."
Dated this 5th day of November 1897.
WALLACE FAIRWEATHER,
Of the Firm of Cruikshank & Fairweather,
Chartered Patent Agents,
Saint Vincent Street, Glasgow, Agent for the Applicant.

page_text: Improvements in Radial Drilling and Tapping Machines.
I, CHARLES HENRY CLIFTON, of 1150, Cathcart Road, Mount Florida, in the City
of Glasgow, 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:-
My invention relates to improvements in radial drilling and tapping machines
and especially in the arrangement, combination and construction of mechanism
for giving a slower motion to the spindle when tapping than is used for drilling
purposes, the arrangements of parts being such as to give greater strength and stiff-
ness to the radial arm, and allow the greatest possible traverse to the saddle along
the radial arm.
The invention is illustrated by the accompanying drawings, Figure 1. being a
front elevation, and Figure 2.a horizontal section of a radial drilling and tapping
inachine. Figure 3 is a horizontal section of parts of such a machine shewing a
modified arrangement of the driving gear.
Under the invention a short intermediate shaft A is carried by the saddle B and
traversed with it and is placed outside the radial arm C of the drilling machine.
This shaft A has two spur wheels D, E, at one end which are free to revolve
independently on it, but the shaft A is adapted to be coupled to either spur
wheel D, E, by means of a clutch F which is keyed to and slides on this shaft A
and can be operated by the movement of a lever G to throw either spur wheel D, E,
into driving gear. These two spur wheels D, E, gear into other two wheels H, I,
also carried by the saddle B and which are driven by the outside main motion
shaft J, along which they are free to slide when traversed by the saddle B. The
two pairs of wheels D, H, E, I, are geared to give different speeds, one pair E, I,
being arranged for a drilling speed, and the other pair of wheels H, I, geared to
give a slower speed necessary for tapping the holes when drilled, or for boring
large sized holes. At the other end of the intermediate shaft A the reversing
wheels are placed, these consisting of three mitre or bevel wheels K, L, M, two
of which, K, L, run in opposite directions and are free to revolve independently
of said shaft A, the third wheel M being fixed upon a short vertical shaft N which
drives the spindle O by means of spur wheels P, Q. The spindle O is driven or
reversed by means of a clutch R keyed to the intermediate shaft A. and which is
free to gear into either of the bevel wheels K, L, running in opposite directions upon
it. A cone pulley S for a belt feed is fixed to the outside bevel wheel L.
In a modification illustrated by Figure 3 the spur wheels D, E, and bevel
wheels K, L, are loosely fitted on the main motion shaft J on which the clutches F,
R, are fitted to slide and the spur wheels D, E, gear with like wheels H, I, on an
intermediate shaft T to provide for varying the speed. One of the spur wheels E
on the main motion shaft J is connected by a sleeve to one of the bevel wheels K
so as to rotate with it either at the higher or lower speed according as the clutch F
between the spur wheels D, E, is made to throw into gear the spur wheel E and
sleeve on one side or the loose pinion D on the other side which by driving through
the speed reducing or increasing gear serves to vary the speed.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what I
claim is:
1. In a radial drilling and tapping machine the combination with the main
motion shaft of an intermediate shaft carried by the saddle and arranged to trans-

page_text: mit motion from the main motion shaft to the spindle, said intermediate shaft
having spur wheels loosely centred thereon and connected thereto by a clutch the
wheels being geared to spur wheels keyed upon the main motion shaft substantially
as and for the purpose described.
2. In a radial drilling and tapping machine the combination with the main
motion shaft having spur wheels loosely centred thereon and connected thereto by
a clutch of an intermediate shaft provided with wheels keyed on said shaft and
arranged to transmit motion from the main motion shaft to the spindle substantially
as and for the purpose set forth.
Dated this 4th down of Awn 1000
WALLACE FAIRWEATHER,
Of the Firm of Cruikshank & Fairweather,
Chartered Patent Agents,
62, Saint Vincent Street, Glasgow, Agent for the Applicant.
WALLACE FAIRWEATHER,
Of the Firm of Cruikshank & Fairweather,
Chartered Patent Agents,
Saint Vincent Street, Glasgow, Agent for the Applicant.