Improvements in Mining Machines.
Year: 1891

page_text: Date of Application, 23rd Dec., 1891-Accepted, 12th Mar., 1892
COMPLETE SPECIFICATION.
Improvements in Mining Machines.
1. ELMER AMBROSE SPERRY, of 201, South-Canal Street, Chicago, Illinois,
United States of America, Electrical Engineer, 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:--
In the Specification No. 15,681, and No. 15,682 of 1890, of inventions communicated
by me from abroad I described mining machines wherein a percussive cutting tool
carried by a portable framing is normally disconnected from a motor engine on the
same framing but is intermittently actuated by the motor.
According to my present invention the actuation of the tool is effected by means
of a hooked arm connected to the tool engaging with a revolving crank pin elastically
connected to a revolving wheel by cushion springs, whereby any shock consequent
on the re-engagement of the crank pin with the hook of the arm is prevented from
being transmitted to the motor engine, as I shall describe with reference to the
accompanying drawings.
Fig. 1 is a side view, Fig. 2 is a plan of the machine.
Fig. 3 a vertical section on the line ", b, d of Fig. 2.
Fig. 4 is a detail view of the pick.
Fig. 5 is a detail view of the fly wheel.
Fig. 6 is a perspective view of the cross head and its arm.
A is one side of the machine with trunnion A for the wheel A', eye A³ for the
shaft of the internal gear and eye A' for the short shaft A. To the piece A is
attached the handle B and the opposite side frame B' is bolted to A. by bolts B' B³.
The side B has a trunnion B3 for the wheel B' and has secured to it the electric
motor consisting of the fixed magnets B, pole pieces B, armature B', cominutator Ba
and switch B. To the pole piece is attached the handle 1310 and the cap 13" for
the exterior of the armature. C is a transverse shaft carrying the armature at one
end and the fly wheel C at the other, and journalled at C. This shaft also carries
the sleeve C3 having at its one end the pinion C which gears with the wheel C' on
the shaft A and having at the other end the arms C Clying within the fly wheel.
In the fly wheel case Care fixed blocks C C7, between which and the arms C* C*
are placed blocks of rubber C8 CB forming an elastic connection between the
sleeve C and the shaft C, which is fixed to fly wheel case C. Besides the wheel C
the shaft A also carries the pinion C which gears with the large wheel C⁰ carried
by the shaft C".
A portion of the side A forms a casing for the wheel C. On the shaft Cis
the sleeve C integral with the wheel Co to the interior of which are secured
blocks C C¹³.
Within the wheel C₁ and carried by the sleeve C" is a boss D having arms D
and D, which has a crank pin D³, carrying the sleeve D'.
Between the arms D¹ D'
and the blocks C C are the rubber cushions DS D' which act as an elastic con-
nection between the wheel C10 and the crank pin D. To the frame B1 are secured
by means of set screws E E the guide rods E' E' on which the cross head E2 E2 slides
and on the outer side of which is secured between the flange on the rods at E'E' and
the keys E E the casting F A rubber cushion F³ is carried by the guide rods and
lies between the cross-head E' and the casting F. Integral with the cross head E'
is the arm E which passes between guide blocks E E" on the frame B' and has a
hook E' at its rear end so situated that the crank pin D³ engages with it during a
portion of every revolution of the wheel C. Secured to the cross head E' by the
key F is the reciprocating tool holder F which passes loosely through the
casting F. The casting F is clamped by means of bolts F F about the tube F
DO17

page_text: within which lies the helical spring F surrounding the bar F. At the outer
extremity of the tube is the slide F against which bears the outer end of the
helical spring F. A suitable pick point G is secured to the end of the holder.
The operator by means of the handles B B directs the machine so as to bring the
pick G to the point of work. By controlling the switch 13 he operates the electric
motor at will, the same being suitably connected with a source of electrical energy.
This drives the shaft C and from it by gearing the wheel C in the direction of
The crank pin D³ engaging the hook E' has drawn back the arm E³
together with the cross head E2 and the pick compressing the spring F.
portion of a revolution of C the crank pin D² lets go the hook and the pick point G
It should be noted that the pick
is projected against the work by the spring F.
-bar is supported at but two points by the slide F and the guide rods E¹ E¹.
the arrow.
After a
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 the fly wheel C' and the crank driving wheel C, the interposition of
rubber blocks between the driving and the driven arms, substantially as and for the
purpose set forth.
2. In combination with the guide rods E the cross head 12 the casting F2 and
the interposed rubber cushion F3 substantially as described.
3. The construction of the crosshead E² with its guided arm E and its hooked
end E' made in one piece with it as and for the purpose set forth.
Dated this 23rd day of December 1891.
ABEL
C
Agents for the Applicant.