Improvements in and relating to Portable Drilling Machines.
Year: 1898

page_text: Date of Application, 10th May, 1898
PROVISIONAL SPECIFICATION.
Improvements in and relating to Portable Drilling Machines.
I, GEORGE CROYDON MARKS, of 18, Southampton Buildings, Chancery Lane,
London, Consulting Engineer (being a communication from abroad by Henri
Balluet, 42, Boulevard Bonne Nouvelle, Paris, in the French Republic), do
hereby declare the nature of this invention to be as follows:-
This invention relates to that class of drilling or boring machine known as
portable, and its object is to provide a universal hand portable drilling machine
of compact, simple, and novel construction.
The invention consists generally in so arranging the portable drill that it can
be clamped rapidly and easily in any position, and further in so arranging the
carrying head that the drill may be operated at any suitable angle, and that
the drill spindle may be operated at various speeds and with any required tool, a
simple arrangement being provided for the feed of the drill.
The construction and operation of the improved portable hand drill is as
follows:-
A rod preferably cylindrical in cross section is provided and carries at its upper
end a double socket piece. This double socket piece consists of two sockets one
at right angles to the other one socket sliding upon the cylindrical rod and being
attached thereto when required by a set screw, and the other socket sliding
similarly upon a second cylindrical rod which carries the drilling mechanism
and also being held in position when required by a set screw. Upon the bottom
end of the cylindrical rod two clamp pieces slide by means of suitable sockets
and these clamp pieces have their distances regulated by means of a perforated
rack attached to one and passing through jaws in the other; a pin being arranged
to key the said jaws and the rack in any required position by passing the pin
transversely through holes in the jaws and one hole in the rack.
These clamps are fixed in their required relative positions when in use upon
the cylindrical rod by a tightening screw or set pin binding the socket of the
clamp which carries the perforated rack. The other clamp which carries the
jaws embracing the rack has formed upon it a clearance hole through which a
screw rod terminated by a suitable head passes and this rod screws into the other
clamp and when operated tightens the said clamps upon the object which it is
desired to fasten the drill to. The socket of the top clamp carrying the rack is
drilled with a second cylindrical hole to embrace the rod upon which it slides
and at right angles to the first and by means of this cylindrical hole the drill
mechanism can be arranged in a second position exactly at right angles to that
now being described though in this case the cylindrical rod would only pass
through the socket of the one clamp.
The cylindrical rod passing through one half of the double socket carries the
drilling mechanism at its outer end which is constructed as follows;-Upon
the outer end of the said rod a screwed boss is formed through which passes a
hollow screwed sleeve and within this screwed sleeve the mandril rotates and

page_text: the bottom end of the mandril is of increased diameter which forms an extended
socket to receive the heads of the drills or boring tools. The upper end of the
mandril projects through the screwed sleeve and has attached to it either the
usual ratchet drill lever or ordinary levers arranged in a manner hereinafter to
be described. Upon the bottom end of the screwed sleeve two handles are formed
so that by rotating them the sleeve is forced against the mandril socket carrying
the drill and the feed is thus applied.
So that drills of any kind may be used a conical depression formed within
the mandril socket carries a corresponding double cone piece, the end of one cone
piece formed with a point and the end of the other cone with a depression and
this double cone is reversed within the mandril socket according as one or other
of its extremities is to be employed..
The ratchet lever employed to operate the drill mandril may be either of the
usual construction and of any suitable length or a plain lever may pass directly
through the socket attached to the head of the mandril by a set screw so that
any leverage may be arranged for by sliding the lever within the said socket.
As an alternative to this a cranked lever with a socket formed upon one end
which fits the end of the mandril may be employed. By these devices the power
and rate of feed required may be altered according to the material operated upon
or size of hole required.
As a means of reducing the friction between the mandril socket and the screwed
sleeve which gives the required feed, a ball race carrying balls is arranged
between the two adjacent faces of the said sleeve and socket and thus forms a
ball bearing.
The bottom end of the cylindrical rod first described may when required be
passed through a boss in a stout plate arranged with symmetrically project-
ing feet and it may be attached to this base-plate by a suitable set screw passing
through a boss formed upon the same. Further suitable symmetrically upward
projecting lugs may be arranged integral with the base plate which can prop
or catch any projections, chains, columns or the like employed when drilling.
This portable hand drilling machine constructed as hereinbefore described
can be fixed up conveniently in any position and it can also owing to its con-
struction in several portions be taken apart for easy removal and further the
joints and sockets permit of a practically universal adjustment while the arrange-
ment of clamps and feed facilitate its easy attachment in any place or position.
Dated this 10th day of May 1898
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham, Agents.
Improvements in and relating to Portable Drilling Machines.
I, GEORGE CROYDON MARKS, of 18, Southampton Buildings, Chancery Lane,
London, Consulting Engineer (being a communication from abroad by Henri
Balluet, 42, Boulevard Bonne Nouvelle, Paris, in the French Republic), -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:-
This invention relates to portable drilling machines and its object is to provide
a universal hand portable drilling machine of compact, simple,, and light
construction.

page_text: The invention consists generally in so arranging the portable drill that it can
be clamped rapidly and easily in any position, and further in so arranging the
carrying head that the drill may be operated at any suitable angle, and that
the drill spindle may be operated at various speeds and with any required tool,
a simple arrangement being provided for the feed of the drill.
The invention is illustrated in the accompanying drawings in which Figure 1
is an elevation of the improved drilling machine whilst
Figures 2 to 8 are detail views of different parts thereof hereinafter referred to.
The improved drilling machine is constructed as follows;-
A rod A preferably cylindrical in cross section is provided and carries at its
upper end a double socket piece B Figures 1 and 3. This double socket piece B
consists of two sockets ab one at right angles to the other. The socket a slides
upon the cylindrical rod A and may be secured thereto by a set screw B¹. The
other socket similarly receives a second cylindrical rod C which carries the
drilling mechanism and may also be held in position by a set screw C¹. Upon
the bottom end of the cylindrical rod A two clamp pieces FG slide by means
of suitable sockets DE and these clamp pieces have their distances regulated
by means of a perforated rack H attached to one F and passing through jaws K
in the other G, a pin L being arranged to key the said jaws and the rack in
any required position by passing the pin transversely through holes in the jaws
and one of the holes M in the rack.
These clamps are fixed in their required relative positions when in use upon
the cylindrical rod by a tightened screw or set pin binding the socket D of
the clamp F which carries the perforated rack. The other clamp G which carries
the jaws K embracing the rack has formed upon it a clearance hole through
which a screw rod I passes terminated by a suitable head and this rod screws
into the other clamp and when operated tightens the said clamps upon the
object which it is desired to operate upon. The socket D of the top clamp F
carrying the rack is drilled with two cylindrical holes MN for the rod A upon
which it slides. The holes are at right angles to each other and therefore allow
the clamping device to be placed in two different positions the one as shown in
Figure 1 and the other at right angles thereto as shown in Figure 5. In the
latter case the rod A would only pass through the socket of the one clamp F.
The cylindrical rod C passing through the part of the double socket B
carries the drilling mechanism at its outer end which mechanism is constructed
as follows; Upon the outer end of the said rod C a screwed boss O is formed
through which passes a hollow screwed sleeve P and within this screwed sleeve
the mandril R rotates and the bottom end of the mandril is of increased diameter
which forms an extended socket S to receive the heads of the drills or boring
tools. The upper end of the mandril R projects through the screwed sleeve P
and has attached to it either the usual ratchet drill lever or ordinary levers
arranged in a manner hereinafter to be described.
Upon the bottom end of the screwed sleeve two handles Q Q are formed so
that by rotating them the sleeve is forced against the mandril socket carrying
the drill and the feed is thus applied.
A conical depression T is formed within the mandril socket S for the reception
of a drill or tool to be rotated by the ratchet or if it is desired to use a tool
rotated by other means independent of the machine a corresponding double cone
piece U Figure 6 is inserted therein one end of the cone piece being formed
with a point U₁ and the other end with a depression U" and this double cone
is reversed within the mandril socket according as the extremity of the tool to
be employed, is pointed or recessed.
The rod C and socket B above described and as shown in Figure 1 may be
dispensed with the socket O being simply carried on an extension of the rod A
as shown in Figure 4.
The ratchet lever employed to operate the drill mandril may be either of the
usual construction and of any suitable length as shown in Figure 1 or a plain

page_text: lever V may pass directly through a socket W secured to the head of the man-
dril by a set screw W so that any leverage may be arranged for by sliding the
lever within the said socket as shown in Figure 2. As an alternative to this a
cranked lever with a socket formed upon one end which fits the end of the
mandril may be employed. By the devices herein described the power and rate
of feed required may be altered according to the material operated upon or size
of hole required.
The friction between the mandril socket S and the screwed sleeve
Figure 1
which gives the required feed, is reduced to a minimum by arranging a ball
race carrying balls between the two adjacent faces of the said sleeve and socket
to form a ball bearing s.
The machine above described is provided with a stout base plate or foot which
is bored with several holes V2 V3 V4 through either of which the rod A may be
passed according to the position desired the rod secured by a set screw
placed as to serve for either position.
SO
Suitable lugs Y¹ for fixing holding down bolts and also upwardly projecting
lugs X3 may be arranged integral with the base plate Y which can prop or
catch any projections chains, columns or the like employed when drilling.
The portable hand drilling machine constructed as herein before described can
be fixed up conveniently in any position and it can also, owing to its construe-
tion in several detachable portions, be taken apart for easy removal and further
the joints and sockets permit of a practically universal adjustment while the
arrangement of clamps and feed facilitate its easy attachment in any place or
position.
Having now particularly described and ascertained the nature of my said
invention in in what manner the same is to be performed I declare that what
I claim is
1. In a drilling machine the combinations of elements for the purposes and
substantially as described.
2. In a drilling machine such as herein described means for holding the work
to be operated upon, consisting of clamping jaws whose distance apart is deter-
mined by an adjustable rack, and either or both of which are adapted to be
mounted in different positions, and which may be bound together by means of
a tightening screw, in the manner for the purposes and substantially as described.
3. In a drilling machine as herein described a pedestal or base plate of the
form substantially as hereinbefore described in combination with a supporting
rod capable of being secured therein in various positions and by the employment
of one set screw for the purposes and substantially as herein before described.
4. In a drilling machine such as hereinbefore described means for adjustably
mounting and feeding the tool substantially as hereinbefore described and
illustrated.
MARKS & CLERK,
18, Southampton Buildings, London, W.C.,
13, Temple Street, Birmingham, and
25, Cross Street, Manchester, Agents.
MARKS & CLERK,
18, Southampton Buildings, London, W.C.,
13, Temple Street, Birmingham, and
25, Cross Street, Manchester, Agents.