IMPROVEMENTS IN BRACES FOR DRILLING
Year: 1876

page_text: LETTERS PATENT to Benjamin William Rogers, of Stourport, in the County
of Worcester, Machinist, for the Invention of "IMPROVEMENTS IN BRACES FOR
DRILLING."
Sealed the 28th October 1876, and dated the 18th August 1876.
PROVISIONAL SPECIFICATION left by the said Benjamin William Rogers
at the Office of the Commissioners of Patents on the 18th August 1876.
BENJAMIN WILLIAM ROGERS, of Stourport, in the County of Worcester, Machinist.
"IMPROVEMENTS IN BRACES FOR DRILLING."
My Invention consists of the improvements herein-after described in braces for
drilling, by which improvements a rotatory and an advancing motion are simul-
taneously given to the drill by the turning of one winch or handle, and the
intermittent advancing motion ordinarily given to the drill by an independent act
on the part of the workman is rendered unnecessary.
The drill is fixed in an axis turning freely in bearings carried by the framing of
the brace, the required rotatory motion being given to the said axis by means of a
winch or handle on the end of a second axis at right angles to the first named axis,
and geared thereto by means of bevil gearing.
The upper part of the axis carrying the drill is formed into a screw taking into
a screw box, on the summit of which screw box is the centre which bears on the
fixed support against which the brace works. The drill axis carries and gives
rotation to a toothed wheel gearing with a pinion on the framing of the brace, the
said pinion also gearing with a second toothed wheel working loosely upon the
drill axis parallel to and of the same size as the first named toothed wheel. It has,
however, one or two teeth less than the first named toothed wheel.
The rotation of the first toothed wheel communicates through the pinion a like
rotation to the second toothed wheel, excepting that in consequence of the difference
in the number of the teeth the rotation is somewhat slower.
The second toothed wheel carries a cylindrical box or case, in which the screw
box herein-before mentioned is fitted, a pin in the side of the screw box taking
into an inclined slot in the case.
The action of the several parts is as follows:-When the winch or handle is turned

page_text: rotatory motion is given to the axis carrying the drill. Rotatory motion is at the
same time given to the box or case in which the screw box is situated, but as the
rotatory motion of the said screw box is somewhat slower than that of the axis
carrying the drill the screw box is virtually unscrewed slowly from the screwed
end of the drill axis which takes into the said screw box. As the screw box
carries the centre on which the brace turns the said screw box cannot move in the
line of its axis, the unscrewing of the said screw box causing the advance of the
screw and consequently the axis carrying the drill and the required advancing
motion of the drill is automatically effected concurrently with the rotatory motion
of the drill.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Benjamin William Rogers in the Great Seal Patent Office on the
12th February 1877.
BENJAMIN WILLIAM ROGERS, of Stourport, in the County of Worcester, Machinist.
"IMPROVEMENTS IN BRACES FOR DRILLING.'
My Invention consists of the improvements herein-after described in braces for
drilling, by which improvements a rotary and an advancing motion are simul-
taneously given to the drill by the turning of one winch or handle and the
intermittent advancing motion ordinarily given to the drill by an independent act
on the part of the workman is rendered unnecessary.
The drill is fixed in an axis turning freely in bearings carried by the framing of
the brace, the required rotary motion being given to the said axis by means of a
winch or handle on the end of a second axis at right angles to the first named axis,
and geared thereto by means of bevil gearing
The upper part of the axis carrying the drill is formed into a screw taking into
a screw box, on the summit of which screw box is the centre, which bears on the
fixed support against which the brace works. The drill axis carries and gives
rotation to a toothed wheel gearing with a pinion on the framing of the brace, the
Baid pinion also gearing with a second toothed wheel working loosely upon the drill
axis parallel to and nearly of the same size as the first named toothed wheel. The
first named or fixed wheel has, however, one or two teeth less than the last named
or loose toothed wheels.
The rotation of the first toothed wheel communicates through the pinion a like
rotation to the second toothed wheel, excepting that in consequence of the difference
in the number of the teeth the rotation is somewhat slower.
The second toothed wheel carries a cylindrical box or case in which the screw
box herein-before mentioned is fitted, a pin in the side of the screw box taking
into an inclined slot in the case.
The action of the several parts is as follows:-When the winch or handle is
turned rotary motion is given to the axis carrying the drill. Rotary motion is at
the same time given to the box or case in which the screw box is situated, but as
the rotary motion of the said screw box is somewhat slower than that of the axis
carrying the drill, the screw box is virtually unscrewed slowly from the screwed
end of the drill axis which takes into the said screw box. As the screw box
carries the centre on which the brace turns the said screw box cannot move in the
line of its axis, the unscrewing of the said screw box causing the advance of the
screw and consequently the axis carrying the drill, and the required advancing
motion of the drill is automatically effected concurrently with the rotary motion
of the drill.
I will now proceed to describe with reference to the accompanying Drawing the
mauner in which my Invention may be performed.
Figure 1 represents in longitudinal section, Figure 2 in end elevation, and Figure

page_text: 3 in plan a brace for drilling, the parts of which are constructed and arranged
according to my Invention.
"
The same letters of reference indicate the same parts in each Figure.
a is the frame of the brace in which the working parts are fitted, and by which
they are carried. m is the drill axis turning in the bearings at a², a¹. In this
axis m the drill or other tool is fixed as usual. b is a spindle at right angles to the
drill axis m for working the said drill axis. The spindle b is turned by the winch.
or handle b. The motion of the spindle b is transmitted to the drill axis m by the
bevil wheels c, d, fixed on the spindle and drill axis respectively. The upper end of
the drill axis m is screwed at m³, the said screwed part working in the screw box
or feed nut i, the summit of which screw box or feed nut carries the centre of
hardened steel working against the plate n, which forms the fixed support against
which the brace works. On the drill axis m are two spur or toothed wheels
marked respectively e, f, the lower wheel being fixed to and rotating with the drill
axis m, and the other wheel turning loosely on the said drill axis. The boss of
the loose wheel f is extended upwards, and forms a casing f³ around the screw
box or feed nut i, the said screw box or feed nut being connected to the said casing
f by the stud pin working in the inclined slot in the casing f. The spur
wheels e, f, contain a different number of teeth, the fixed wheel e containing one or
two teeth less than the other or loose wheel f. On the top of the framing a of the
brace is a third spur wheel or pinion turning on the axis or centre h. This spur
wheel or pinion is as broad as and gears with both of the spur wheels e-and f
2
I will now describe the action of the brace:-Supposing the winch or handle b¹
to be turned in the direction proper to give through the bevil wheels c, d, motion
to the drill axis m in the direction indicated by the arrow, the spur wheel c fixed
to and turning with the said axis will give notion to the spur wheel g, and the
latter will give motion to the upper spur wheel turning loosely on the drill
axis m.
As the wheel contains a greater number of teeth than the lower fixed
wheel e a differential motion is given to the said wheel compared with that given
to the wheel e and axis m, the said wheel f and its casing f2 rotating at a loss
speed than the said drill axis m. The motion of the casing f* is transmitted
through the stud pin and slot f³ to the feed nut or screw box i, the latter
partaking of the retarded motion of the wheelf and its casing f². The result of
this arrangement is that the screw box or feed nut i unscrews itself slowly from
off the screwed end m³ of the drill axis m, thereby causing the centre to be
thrust against the support or resistance n, and the brace to bodily descend, and
with it the drill or cutter carried in the brace axis m. The required advancing
motion of the drill or cutter is thus automatically effected simultaneously with the
rotary motion of the said drill or cutter. As the casing f descends the pin k of
the screw box rises in the inclined slot in the said casing.
Instead of giving rotatory motion to the drill axis m by means of the spindle b
and bevil wheels c, d, as described and illustrated, the said drill axis may be
rotated by the ordinary ratchet and pawl or by friction gear, or in any other
convenient manner.
Having now described the nature of my Invention, and the manner in which
the same is to be performed, I wish it to be understood that I do not limit myself
to the precise details herein described and illustrated, as the same may be varied
without departing from the nature of my said Invention, but I claim as my
Invention of improvements in braces for drilling, the construction and combination
of the parts of the differential feed motion herein-before described and illustrated
in the accompanying Drawing, whereby the advancing motion of the drill or tool is
automatically effected concurrently with the rotary motion of the said drill or tool,
that is to say by means of the differential fixed and loose spur or toothed wheels
e, f, on the brace axis coupled together by the third toothed wheel or pinion g, in
combination with the casing f2, screw box or feed nut i, and serowed end of the
said brace axis, whether the brace axis be turned by an independent spindle and

page_text: bevil gearing or by the ordinary ratchet and pawl or by any convenient mechanism'
substantially as described and illustrated.
In witness whereof, I, the said Benjamin William Rogers, have hereunto set
my hand and seal, this Eighth day of February, in the year of our Lord
One thousand eight hundred and seventy-seven.
Witness,
ABEL DINGLEY,
Stourport,
Worcestershire.
BENJAMIN WILLIAM ROGERS.. (L.S.)