IMPROVEMENTS in Drilling Apparatus
Year: 1884

page_text: I SIDNEY ALEXANDER HOUGHTON of the Training School for Engineer Students,
Devonport, in the County of Devon, Engineer Student do hereby declaro the
nature of my said Invention for IMPROVEMENTS in Drilling Apparatus, to be
as follows:-
My Invention relates to that class of drilling apparatus generally known as hand,
or portable drills, or ratchet braces, and has for its object tho working of such drills,
or like tools by means of electricity and provides a means for rotating the drill and
feeding it up to its work by means of an electro motor, driven by a current of
electricity led from any suitable generator of electricity to the electro motor.
A drilling apparatus according to my Invention consists of an electro motor, the
armature of which is mounted on and runs loose on the spindle to which the drill is
fixed. The field magnets of the electro motor surround the armaturo, in which
position they are supported by brackets, which support a secondary spindle. The
armature is provided with a toothed pinion, which gears into a toothed wheel on
the secondary spindle. On this spindle there is mounted a pinion which gears into
a toothed wheel on the drill spindle. This train of wheels serves to transmit the
rotary motion of the armature to the drill at a much slower speed. The drill
spindle is provided with a feeding screw to feed up the drill to its work, the end of
the screw having a back centre, as usual in hand drills. At one end of the secondary
spindle, there is a loose pinion with a jam nut, or a pawl and ratchet wheel or
equivalent means of connecting. This loose pinion is geared into a tooth wheel
feeding screw, which works by means of a key and slot, and by tightening the
jam-nut, the pinion on the secondary spindle rotates the wheel at a slower speed
than the drill spindle and works the feeding screw. A rod, or arm is provided and
between the arm and the work there is placed a spiral spring through which the
drill passes. The rod, or arm can be adjusted by a set screw so as to prevent the
drill falling through, when drilling short vertical holes, the drill being fed through
against the pressure of the spring. The whole apparatus is contained in a casing.
Although I have described the electro motor geared on the drill by a train of
toothed wheels for reducing the speed of tho tool below that of the motor it will be
evident that the same end may be obtained by the use of bevel wheels, or by
means of worm and wheel motion.
In the application of the apparatus to work tools other than drills, such as a
rotary plane, the planeing, or other tool is substituted for the drill.
Dated this Fighth day of Tanu 1001
CHEESBROUGH & ROYSTON,
Agents for the said
Sidney Alexander Houghton.

page_text: I SIDNEY ALEXANDER HOUGHTON of the Training School for Engineer Students,
Devonport in the County of Devon, Engineer Student. do hereby declare the
nature of my said Invention for IMPROVEMENTS IN DRILLING APPARATUS 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 that class of drilling apparatus generally known as hand,
or portable drills, or ratchet braces, and has for its object the working of such drills,
or like tools by means of electricity and provides a means for rotating the drill and
feeding it up to its work by means of an electro-motor, driven by a current of
electricity led from any suitable generator of electricity to the electro-motor.
"
- The following is a description of a drilling apparatus according to my Invention
reference being had to the accompanying sheets of Drawings making a part of
this Specification and to the letters and figures of reference marked thereon, like
letters and figures being used to denote like, or corresponding parts throughout the
Figure 18 an e' section Ig
--The-apparatus consists-of-an-electro-motor,-the-armature-A-of-which- -is-mounted--
on and runs loose on the spindle B to which the drill C is fixed. The field 2
magnets D of the electro-motor surround the armature A-in which position they
aro supported by the bearing brackets E E which brackets also carry a secondary
spindle F. The armature A is provided with a toothed pinion G which is mounted
on the hollow spindle G' of the armature A and which gears into a toothed
wheel H on the secondary spindle F. On the spindle F there is mounted a pinion I
which gears into a toothed wheel J on the drill spindle B. This train of wheels
serves to transmit the rotary motion of the armature A to the drill C at a reduced
speed. The drill spindle B is provided with a feeding screw K to feed up the drill C
to its work the end of the screw K having a back centre K¹ as usual in hand drills
The secondary spindle F is provided with a loose pinion L with a jam nut M, or a
pawl and ratchet wheel, or equivalent means of connection to the spindle F the
pinion L gears into the toothed wheel O, the boss of which is screwed and feeds
the feeding screw, K which is provided with a slot in which works a key P and by
tightening the jam nut M the pinion L rotates the wheel O at a slower speed than
the drill spindle B and works the feeding screw K.
An arm Q is provided and between this arm and the work, there is placed a
spiral spring R through which the drill C passes. The arm Q is carried from the
back centre support by any suitable device and is made adjustable, so as to prevent
the drill C falling through when drilling short vertical holes. The drill C is fed
against the pressure of the spring R. The whole apparatus is contained in a
suitable casing. The electric conductors a a pass to the apparatus through the
ebonito cylinder band are therein attached to the brass springs which press
4

page_text: against and are held apart by the copper pieces d, which are insulated, but in
connection one with the magnet wire and the other with one of the brushes e. The
cylinder bis held to the casing S by spring catches f which bear upon the rim g of
the cylinder b. The spring catches f are forced back to admit of the cylinder b
being withdrawn by the cam ring h.
The apparatus according to my Invention shown at Figures 3 to 6 is provided
with a worm and worm wheel gear for rotating the drill Cand feeding it up to its
work. By this means the reduction of speed between the drill and the electro
motor is obtained and is an alternative of the reducing gear specified with reference
to Figures 1 and 2 of the Drawings. Gis the worm mounted on the spindle G' of
the armature A. The worm G drives the wheel J, which is mounted on the drill
spindle B, which is held and works in the bearing brackets E E¹. On the spindle B
is mounted a toothed wheel J which may forin part of the wheel J which gears
with the toothed wheel H on the secondary spindle F borne by the bracket E¹.
On the spindle F there is mounted a loose pinion L and jam nut M, or pawl, or
ratchet wheel or equivalent means of connection to the spindle F. The pinion L
gears into the toothed wheel O, the boss of which is screwed and feeds forward the
drill as before described.
Although I have described the electro motor geared on the drill by a train of
toothed wheels, and worm gear, for reducing the speed of the tool below that of the
motor, it will be evident that the same end may be obtained by the use of bevel
wheels.
In the application of the apparatus to work tools other than drills such as a
rotary plano, the planeing, or other tool is substituted for the drill.
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
First In drilling apparatus, the combination of an electro-motor consisting of an
armature and field magnet, the armature being connected, or geared to the tool
holder through a reducing.gear substantially as set forth.
Second The combination with a drilling apparatus substantially as specified, of
an arm such as Q and spring R for the purpose set forth.
Third The combination and arrangement of parts substantially, as described and
illustrated in Figures 1 and 2 of the Drawings hereto annexed.
Fourth The combination and arrangement of parts, substantially as described
and illustrated in Figures 3. 4. 5 and 6 of the Drawings hereto annexed.
Dated this seventh day of October 1884.