An Improved Ratchet Drill and Countersink.
Year: 1890

page_text: COMPLETE SPECIFICATION.
An Improved Ratchet Drill and Countersink.
We, HANS CONSTANT MÜLLER of No. 4 Place Neuve Geneva Switzerland
Pharmaceutical Chemist and CHRISTIAN Joss of Terrasière Geneva Switzerland
Mechanician 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 :--
The subject of this invention is an improved ratchet drill and countersink and
its object is to devise a means to permit a continuous rotation of the drill in one
direction, the drill thus operating twice as fast as those ratchet drills in which the
rotation is intermittent and it also has the advantage that it can be used in confined
spaces where there is insufficient room to get an extended motion of the actuating
handle. Our improved ratchet drill may however be used as an intermittent drill
when desired without in any way altering or rearranging the parts thereof.
In the accompanying drawings, in which like letters of reference indicate
corresponding parts throughout the figs. :-
Fig. 1 represents a longitudinal elevation and part section of our improved drill.
Fig. 2 shews an end view partly in section of the same.
Fig. 3 is a section through line y-z Fig. 2.
Fig. 4 shews the actuating lever or handle and Fig. 5 shews the countersinking
attachment.
A is the drill-carrier the front portion of which is provided with a socket u
into which the shank of the drill can be fitted; pressure being applied to the drill
by the screw B. Upon the said drill-carrier A is fixed a bevel ratchet wheel (
secured thereto by means of a screw c. A collar D is also secured to the carrier A
in a similar manner by means of the screw d. Between the bevel ratchet wheel C
and collar D is a sleeve or ring E which is free to rotate upon the said carrier A.
This sleeve or ring E has, either formed therewith, or secured thereto, at
diametrically opposite points, trunnions e. The actuating lever or handle F is
forked at its lower end and at the extremity of the forked portion is provided with
bosses in which work the trunnions e. The said bosses f are provided with
rectangular extensions f¹at right angles to the bandle F, said extension having a
recess in which clicks or pawls H H are fitted, which are pressed against the bevel
ratchet wheel C by the flat springs 1.
By causing the lever or handle F to oscillate in the direction of the arrows hi
Fig. 1, in a plane parallel to the axis of rotation of the drill, the pawls H, H³,
alternately cause the wheel C to rotate in one and the same direction,-pawl H
operating when the lever F is moved towards point h, and pawl H' when the movement
is in the opposite direction, viz. towards point i.
:
In the event of its being desirable to produce an intermittent rotation of the drill,
(as in ordinary ratchet drills,) the handle or lever F is moved backwards and forwards
in a plane perpendicular to the axis of rotation of the drill, (as indicated by the
arrows m n in Fig. 2) which causes only one of the pawls to operate, the other merely
passing the teeth of the wheel C.
When it is desired to countersink the hole drilled, the drill-carrier A is replaced by
the countersink-bearer J. This is fitted in the same manner as the drill carrier A
herein before described. A screwed rod K passes loosely through this bearer J, said
rod being caused to rotate therewith by the screw k. The rod K is grooved along a
portion of its length as shewn at 1 Fig. 5 in order to allow of its sliding freely in
the bearer J, without turning round independently therein, by reason of the end of the
screw k entering the said groove l. The countersink L is secured to the end of the
rod K by means of a pin o which passes through the countersink and rod in a hole

page_text: provided for the purpose. As before stated the countersink bearer J is fitted in a
similar manner to the drill carrier before described, and it will be evident that the
reciprocating movement of the handle will cause the countersink to revolve in like
manner with the drill. Pressure is applied to the countersink by the hand nut N
when the tool is in use.
It will be seen that other tools may be substituted for those herein described without
departing from the spirit of our invention.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what
we claim is :-
1. In a ratchet drill the combination of the drill carrier, to which is secured the
bevel ratchet wheel, the operating lever provided with extensions in which are fitted
spring pawls, the whole constructed and operating substantially as described and
illustrated in the accompanying drawings.
2. In a ratchet drill the combination of a bevel ratchet wheel, actuating handle and
pawls arranged to impart a continuous rotation of the drill by a reciprocating
movement of the said handle, substantially as described and illustrated in the
accompanying drawings.
Dated this 21st day of August 1890.
HANS CONSTANT MÜLLER,
('HRISTIAN JOSS.
By their Agents,
Horn & Son.