Year: 1890

page_text: Date of Application, 3rd Oct., 1890-Accept:d, 8th Nov., 1890

page_text: the slide F against which bears the outer end of the helical spring F. A suitable
pick point is secured to the end of the holder preferably as shewn.
The operator by means of the handles B. Bo directs the machine so as to bring the
pick to the point of work. By controlling the switch B he operates the electric
motor at will, the same being suitably connected with a source of electrical energy.
This drives the shaft C and hence, by the before mentioned gearing the wheel C is
driven in the direction indicated by the arrow.
It is, in Figure 3 assumed that the spring F is extended, but as soon as the
rotation brings the hook J' into engagement with the pin J³ the crank, which can
turn freely on its journals, will be carried round by means of such spring J toward
the position indicated in dotted lines in Fig. 3, thus drawing back the slide E' and
compressing the spring F. As soon as the parts reach the position indicated in
dotted lines. the force of the spring F' will be enabled. to draw the crank out of the
book as indicated, and the pick point will be thrown against the work. As soon as
its blow is delivered its progress will be stopped, the fact that the pitman E is looped
and flexible or elastic permitting of this, and almost immediately it will be caught
up again by the hook of the spring J by the further revolution of the wheel C. The
connection between the working portion of the wheel C and its shaft A is made by
means of the springs L L, the ledges L' L' and the parts L2 L2 which are keyed upon
the shaft A as shewn at Fig. 5.
The flexible pitman E may be replaced by the jointed pitman N, the two portions
of which are pivotted together and suitably connected to the sleeve or pulley D¹, and
by the pin O to the slide E².
Beneath these pivotted parts is the upward bearing spring S secured upon the
bottom of the frame B₁ so that when the blow is delivered the portion of the jointed
pitman will be thrown upward as indicated.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that: what I
claim is :-
1. In a mining machine with a percussive tool operating as herein described, con-
structing the spring connecting device, connecting the crank with the motor as a
curved steel spring attached at one end to a pin on a revolving wheel or disc driven
by the motor, while its other end is formed as an open loop or hook which, as the
spring revolves, engages with the pin of a loose crank with which the pitman is
connected, and, in carrying it round, effects the drawing back of the tool until when
arrived at a certain point the spring of the tool draws the crank pin out of the hook
and propels the tool forward, substantially as described.
2. In a mining machine with a percussive tool, having spring action, the combination
of the tool holder FI connected by the flexible pitman E to the loose crank D, with
the curved spring J attached to the motor wheel C by pin P and having a hooked
end J by which it engages with the pin of crank D so as to carry it round during
part of a revolution, substantially as described.
3. In a mining machine with a percussive tool operating as herein described, the
use of a flexible or elastic pitman consisting of a looped strap E secured at its
ends to the slide E2 and fitting with its loop round the crank pin, substantially as
described.
4. In a mining machine with a percussive tool operating as herein described, the
use of a jointed pitman N constructed and operating as described with reference to
Fig. 6 of the drawings.
Datad thin 2nd dow of Databa- 1900
ABEL & IMRAY,
Agents for the Applicant.