An Apparatus for Boring or Drilling Rock or other Material.
Year: 1889

page_text: Date of Application, 14th Mar., 1889
Complete Specification Left, 14th Dec., 1889-Accepted, 18th Jan.,
1890
PROVISIONAL SPECIFICATION.
An Apparatus for Boring or Drilling Rock or other Material.
I, EMILE SALENDRE of 1 Boulevard St. Denis, Paris, France, Gentleman, do hereby
declare the nature of this invention to be as follows:-
My invention consists of an apparatus for boring or drilling rock or other
material.
The said apparatus is composed of a mandrel fitted with a ratchet lever for turning
the same and formed at back with a longitudinal. threaded rod. This rod engages in
a long nut for a part of its length. The nut is made in two or more pieces and can
be opened on a hinge at its rear end so as to free the threaded rod; when the nut is
closed the pieces of which it is composed are held tightly together by a ring or other
suitable device.
The mandrel carries a boring tool the end of which is formed with a double bit or
cutter; it is the two parts of this bit or cutter only that disaggregate the substance of
the rock or other material and as their surface is small the apparatus requires little
power to work it. The material which enters the space between the two parts of the
bit becomes detached from the mass without difficulty.
The apparatus when at work rests at its rear end on a suitable support; a hook on
the nut holds one end of a chain, the other end of which is fixed to the rock which is
being bored; a tightening screw keeps the chain taut and maintains the apparatus
firmly in position.
The apparatus is applicable not only for use in mines or quarries but also for other
purposes where boring or drilling is required.
Dand thin with
1000
J. C. MEWBURN,
55 & 56, Chancery Lane, London, Patent Agent.
COMPLETE SPECIFICATION.
An Apparatus for Boring or Drilling Rock or other Material.
I, EMILE SALENDRE of 1 Boulevard St. Denis, Paris, France, Gentleman 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 :-
My invention consists of an apparatus for boring or drilling rock or other material.
This apparatus is illustrated in the annexed drawings, Figure 1 showing it mounted in
position for work and Figures 2 and 3 being views on a larger scale.
The apparatus is composed of a mandrel a fitted with a ratchet lever for turning
This rod engages
the same and formed at back with a longitudinal threaded rod c.
in a long nut d for a part of its length. The nut d is made in two or more pieces
(two as seen in the drawing and can be opened on a hinge at its rear end so as
to free the threaded rod c; when the nut is closed the pieces of which it is composed
are held tightly together by a ring for other suitable device.
The mandrel a carries a boring tool the end of which is formed with a double
bit or cutter g, g; it is the two parts of this bit or cutter only that disaggregate
the substance of the rock or other material and as their surface is small the apparatus
requires little power to work it. The material which enters the space between
the two parts of the bit becomes detached from the mass without difficulty.
The apparatus when at work (see Figure 1) rests at its rear end on a suitable
support; a hook ; on the nut holds one end of a chain k the other end of which is
fixed to the rock or other material which is being bored; a tightening screw / keeps
the chain taut and maintains the apparatus firmly in position.

page_text: The apparatus is applicable not only for use in mines or quarries but also for other
purposes where boring or drilling is required..
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
The boring or drilling apparatus constructed substantially as hereinbefore described
and represented in the annexed drawings.
Dated this 14th day of Dec 1868.
--
J. C. MEWBURN.
55 & 56, Chancery Lane, London, Patent Agent.