Improvements in Ratchet Mechanism for Drills and the like.
Year: 1894

page_text: Date of Application, 22nd Mar., 1894
Complete Specification Left, 18 h June, 1894--Accepted, 21st July, 1894
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PROVISIONAL SPECIFICATION.
Improvements in Ratchet Mechanism for Drills and the like.
I, HENRI BASCHY, of Hafenstrasse 35, Hamburg, in the Empire of Germany,
Mechanic, do hereby declare the nature of this invention to be as follows :—
This invention relates to Improvements in Ratchet Mechanism for Drills and the
like by means of which the tool (hereinafter referred to as a drill) is rotated in a
practically continuous manner in one direction.
For this purpose, in addition to the ordinary hand-lever with ratchet which rotates
the drill in a forward direction during the forward motion or motions, say from right
to left of the hand-lever, mechanism is provided which rotates the drill in the same
direction during the backward motion of the hand-lever.
Referring to the accompanying drawings
Fig. 1 shews in plan a ratchet drill according to this invention with one of the
cover-plates removed and
Fig. 2 shews the same in section on the line A B of Fig. 1.
The ratchet-drill consists, as ordinarily, of a hand-lever a, the forked part of
which serves for the reception of a toothed wheel b, which is connected with the
tool-holder and with which there engages a spring pressed ratchet c, pivoted to the
hand-lever. During the movement of the hand-lever to the left the ratchet engages
with the ratchet-wheel b, and carries it round with it. These parts are arranged
between two plates d between which is also located, so as to partially encircle the
ratchet-wheel b, a toothed arc or part ring f, which is capable of sliding motion
in correspondingly curved grooves 9 formed in the plates d. The toothed arc f gears
with a second toothed sector h which is capable of being rotated about a pin i and is
connected with the hand-lever a by a link k. To the toothed arcf there is secured a
spring-pressed ratchet 1, which is adapted to engage in the ratchet-wheel b and rotate
it in the same direction as the ratchet c.
During the motion of the hand-lever a from the position shewn in Fig. 1 to that
indicated by dotted lines, the ratchet c, as already mentioned, rotates the drill
with it in a right-handed manner. Simultaneously the toothed sector h is turned in
a similar manner about the pin i by means of the link k and the toothed arc thus
moved in its grooves in the reverse direction to the toothed wheel b. During this
motion the ratchet 1 of the arc f slides over the teeth of the wheel b. On the hand-
lever being now turned back into its initial position the ratchet l-will not slide over
the teeth, but will, on the contrary, engage in the same and, during the backward
motion of the toothed arc fimparted thereto by the link k and sector from the
hand-lever, will take the ratchet-wheel with it, consequently rotating it in a right-
hand manner. The practically continuous rotation of the drill in one direction is
thus effected.
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page_text: I, HENRI BASCHY, of Hafenstrasse 35, Hamburg, in the Empire of Germany,.
Mechanic, 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 an improved construction of ratchet mechanism for drills
and the like whereby the tool (hereinafter referred to as a drill), can be rotated in
a practically continuous manner in one direction.
According thereto in addition to the ordinary hand-lever and ratchet which
rotates in the drill in a forward direction during the forward motion or motions
say from right to left of the hand lever, an improved arrangement of mechanism is
provided which serves to rotate the drill in the same direction during the backward
motion of the hand-lever as I will now proceed to explain by reference to the
drawings filed with my Provisional Specification in which,
Fig. 1 shews in plan a ratchet drill according to this invention with one of
the cover-plates removed, and Fig. 2 shews the same in section on the line A B
of Fig. 1.
The ratchet-drill consists, as ordinarily, of a hand-lever a, the forked part of
which serves for the reception of a toothed wheel b, which is connected with the
tool-holder and with which there engages a spring-pressed pawl c pivoted to the
hand-lever. During the movement of the hand-lever to the left the pawl engages
with the ratchet-wheel b and carries it round with it. These parts are arranged
between two plates d between which is also located, so as to partially encircle
the ratchet wheel b, a toothed arc or part ring f, which is capable of sliding motion
in correspondingly curved grooves g formed the plates d. The toothed arc, f gears
with a toothed sector which is capable of being rotated about a pin i and is
connected with the hand lever a by a link k. To the toothed arc f there is secured
a spring-pressed pawl l, which is adapted to engage in the ratchet-wheel band rotate
it in the same direction as the ratchet c.
During the motion of the hand-lever a from the position shewn by full lines in
Fig. to that indicated by dotted lines, the pawl c, as already mentioned, rotates
the drill with it in a right-handed direction. Simultaneously the toothed sector h
is turned in a similar manner about the pin by means of, the link k and the
toothed arc is thus moved in its grooves g in the reverse direction to the toothed
wheel b. During this motion, the pawl of the arc f slides over the teeth of the
wheel b. On the hand-lever being now turned back into its initial position, the
pawl will not slide over the teeth, but will, on the contrary, engage in the same
and, during the forward motion of the toothed arc f, imparted thereto by the link k
and sector from the hand-lever, will take the ratchet-wheel with it,. consequently
rotating it in a right-hand direction. The practically continuous rotation of the
drill in one direction is thus effected.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
Ratchet mechanism for drills and the like wherein there is combined with the
ordinary hand-lever a with pawl c and ratchet-wheel b, a toothed sector capable of
turning about a centre and connected with the said hand-lever by a link k, and in
gear with a toothed arc or part ring mounted to slide in grooves g formed in the
cover-plates d, the said toothed arcf being provided with a pawll adapted to engage

page_text: with the ratchet-wheel b during the backward motion of the hand-lever at which time-
the pawl c is inoperative substantially as described.
Dated this 18th day of June 1894.
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.