Improvements in Machines for Cutting and Sharpening Rock and like Drills.
Year: 1896

page_text: Date of Application, 22nd Oct., 1896
Complete Specification Left, 23rd Nov., 1896-Accepted, 2nd Jan., 1897
PROVISIONAL SPECIFICATION.
Improvements in Machines for Cutting and Sharpening Rock and
like Drills.
I, FREDERICK GEORGE MYERS, of Box No. 2508, Johannesburg, South
African Republic, Mechanical Engineer, do hereby declare the nature of this
invention to be as follows:-
This invention relates to machines for cutting and sharpening rock and like drills
of any sectional shape. The chief feature of the said invention is a series of two
or more slides working in grooves or on guides and provided with suitable cutters
on their inner ends.
The said slides and cutters are caused to converge towards a common centre
simultaneously by suitable mechanism.
According to one convenient construction the machine comprises a strong vertical
frame, or body, to which are affixed a series of projecting blocks so located as to
form between them guide grooves in which the slides carrying the cutters work.
For operating on star drills for example, there would be four slides and four grooves,
but for other drills I may use any suitable number of slides and cutters according
to the shape of the drill to be operated upon. The said slides are kept in position
by a front cover or stress plate held in place by bolts or screws passing through the
main frame.
At each angle or corner of the main frame, and of the cover plate, bosses are
formed to serve as bearings, in which work the eccentric shafts that actuate the
said slides.
The said slides are constructed at their inner ends, where they converge towards
the centre, to carry each a firmly attached steel cutter, and at their other or outer
ends, they are constructed to carry bearings adapted to slide laterally with respect
to the slides, in which bearings the eccentric shafts work, the motion of the latter
causing the said slides to move forward and backward in their respective grooves,
to and from the common centre.
On the back vertical face of the main frame are toothed wheels keyed on to the
eccentric shafts and gearing into each other. One of the shafts is longer than the
others and carries at its extremity the driving gear, which may be an ordinary
band pulley or gear wheel, or such other device as may be found most suitable.
The method of working is as follows:-Power being applied to the pulley or
other gearing on the driving shaft by any well known means, it causes all the other
shafts to rotate simultaneously and at the same speed by means of the toothed
wheels keyed thereon, which wheels as above stated gear into each other. The
eccentric parts of the shafts working in the sliding bearings on the outer ends of
the slides, cause the latter to be moved with great force to and from the common
centre, and any piece of metal, such as a rock drill, made either of octagon, star or
other section of steel, when placed between the cutters would be rapidly cut off and
automatically sharpened.
Although I have described the above mentioned methods of causing the slides
and cutters to converge simultaneously I may employ other suitable means of
effecting this object.
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Oben 1906
HASELTINE, LAKE & Co.,
45 Sonthampton Buildings, London, W.C., Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in Machines for Cutting and Sharpening Rock and
like Drills.
I, FREDERICK GEORGE MYERS, of Box No. 2508, Johannesburg, South
African Republic, Mechanical 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:-
This invention relates to machines for cutting and sharpening rock and like
drills of any sectional shape, and the chief feature of the said invention is a series
of two or more slides working in radial grooves or guides and provided with
suitable cutters at their inner ends. The said slides are simultaneously actuated
by suitable mechanism and are thereby caused to slide radially to and from a
common centre.
Referring to the accompanying drawings which illustrate a convenient form of
machine for cutting and sharpening "star" drills,
Figure 1 is a front elevation of the machine,
Figure 2 is a section on the line M, N of Figure 1, and
Figure 3 is a section on the line O, P Figure 1.
Like letters of reference denote corresponding parts in both figures.
A is a strong vertical frame or body constructed with four projecting blocks a
forming between them guide grooves in which the slides B carrying at their inner
ends the cutters E work. The said slides are kept in position by a front cover or
stress plate C bolted to the frame by bolts c. e, e are additional triangular
retaining plates bearing on the slides. As above stated the machine is for
operating on "star" drills, which necessitate four slides as shown. For operating
on drills of other shapes a different number and arrangement of slides would be
required. In all cases the cutters are suitably formed in accordance with the shape
of the drills to be operated upon.
At each angle or corner of the main frame A aud of the cover plate C bosses are
formed, the same being suitably prepared to serve as bearings for eccentric
shafts D that actuate the slides. For this purpose the outer ends of the slides
are constructed to receive bearing blocks H that can slide transversely in the
slides and that embrace the eccentric parts of the shafts D; the rotation of the
latter causes the slides to move to and fro in their respective grooves to and from a
common centre. Upon the rear end of each shaft D is keyed a toothed wheel G,
and the said wheels gear with each other and are of equal size so that the shafts D
are caused to rotate at the same speed. One of the shafts is longer than the others
and it carries at its extremity a driving pulley or gear wheel or other means by
which it can be driven from a convenient shaft or engine.
The method of working is as follows, that is to say, power being applied to
rotate the pulley or other gearing on the driving shaft all the shafts D are thereby
simultaneously rotated and at the same speed by means of the wheels G, and the
eccentric parts of the shafts working in the sliding bearings H cause the slides B to
be thrust with great force toward the common centre and then to be withdrawn,
once for each revolution of the shafts. Any piece of metal therefore such as a
rock drill placed between the cutters would be rapidly cut and sharpened.
Other suitable mechanism than that above described may be employed for
actuating the slides without departing from the spirit of my invention.
Having now particularly described and ascertained the nature of my said inven
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. A machine having two or more slides working in grooves or guides the said

page_text: slides being adapted to be moved simultaneously to and from a common centre and
carrying on their inner ends detachable cutters, for the purposes specified.
2. A machine constructed substantially as described with reference to the
accompanying drawings and operating as, and for the purposes, specified.
Dated this 23rd day of September 1896.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.