Improvements in and relating to Drilling Machines.
Year: 1899

page_text: Date of Application, 20th Jan., 1899
Complete Specification Left, 20th Oct., 1899-Accepted, 16th Dec., 1899
PROVISIONAL SITULTIVATION.
Improvements in and relating to Drilling Machines.
I, CHARLES HERVEY, of Highfield, Stetchford, in the County of Worcester,
Manager of Works, do hereby declare the nature of this invention to be as
follows:
-
This invention relates to that type of drilling machine commonly known as
a ratchet brace, and it consists in combining with the ratchet operating mechanism
an epicyclic train or balance" gear so that motion is imparted to the drill by
the movement of the operating lever in both directions.
The ratchet lever is formed in the usual manner with a jaw in one lip of which
is mounted the drill chuck which carries on the inner side of the said lip both
a ratchet wheel and a spur wheel which are preferably formed in one piece. The
other lip of the jaw carries a hollow stud bearing on which is mounted a ratchet
wheel and spur wheel similar to the one mounted on the drill chuck with the
exception that the teeth of the ratchet wheel incline in the opposite direction.
Between the combined ratchet and spur wheels is mounted a sleeve carrying two
or more radially arranged arms or axles on which are mounted bevel pinions
which gear with the bevel wheels. This sleeve carries a key or feather which
engages with a longitudinal key or feather way in the feed screw so that while
the feed screw is free to move longitudinally independent of the sleeve carrying
the pinions of the epicyclic train it has no independent rotary movement apart from
the said sleeve.
The upper end of the feed screw which is provided with the usual feed nut,
is made square or otherwise shaped to engage with the bracket adapted to support
the brace so that the said feed screw, and also the collar carrying the pair of bevel
pinions cannot rotate. Consequently when the ratchet lever, which is provided
with two spring controlled pawls engaging the two ratchet wheels, is moved in
one direction motion is imparted to the drill chuck direct when it is moved in
the other direction, motion is imparted to the drill chuck through the epicyclic
train or balance gear.
Improvements in and relating to Drilling Machines.
I, Charles Hervey, of Highfield, Stretchford, in the County of Worcester,
Manager of Works, do hereby declare the nature of this invention and in what
017

page_text: manner the same is to be performed to be particularly described and ascertained
in and by the following statement:-
This invention relates to that type of drilling machine commonly known as
a ratchet brace, and it consists in combining with the ratchet operating mechanism
an epicyclic train or "balance" gear in such a manner that the operating lever
moves in a plane at right angles to the axial line of the drill and that the alter-
nate motion of the said lever in opposite directions imparts a continuous motion
to the drill in a forward or cutting direction only.
In the accompanying drawing which illustrates this invention:--
Figure 1 is a broken view in side elevation.
Figure 2 is a broken view in sectional plan, and
Figure 3 is a view in plan.
Throughout the views similar parts are marked with like letters of reference.
The ratchet lever A is mounted in the usual manner with a jaw in the lower
lip of which is mounted a drill chuck 13 which carries on the inner side of
the said lip both a ratchet wheel C and a bevel wheel D which are preferably
formed in one piece. The upper lip al of the jaw carries a sleeve hearing E on
which is loosely mounted a ratchet wheel C and bevel wheel D' similar to those
mounted on the drill chuck with the exception that the teeth of the ratchet
wheel C incline in the opposite direction. On the sleeve bearing E between the
combined ratchet and bevel wheels CD and CD are two or more radially
arranged arms or axles c on which are mounted bevel pinions F which gear with
the bevel wheels D, D. The sleeve E has a longitudinally arranged key or
feather which engages with a longitudinal key or featherway in the feed
screw so that while the said screw is free to move longitudinally independent
of the sleeve E it has no independent rotary movement apart from the said
sleeve.
The upper end of the feed screw G which is provided with the usual feed
nut H is made square or otherwise shaped to engage with the bracket employed
to support the brace so that the said feed screw G and also the sleeve E carrying
the bevel pinions F cannot rotate. Consequently when the ratchet lever A which
carries two oppositely arranged spring controlled pawls K, K. engaging the two
ratchet wheels C. C₁, is moved in one-say the forward-direction, motion is
imparted to the drill chuck direct and when it is moved in the other-or the back-
ward direction motion is imparted to the drill chuck through the epicyclic train
or "balance
gear, thus imparting a continuous forward or cutting motion to
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:-
The improved construction of ratchet brace herein before described and illus-
trated by the accompanying drawing in which the operating lever moves in a
plane at right angles to the axial line of the drill and in which alternative motions
in opposite directions of the said lever produces a continuous forward or cutting
motion of the drill.