Improvements in Multiple Drilling Machines.
Year: 1892

page_text: Date of Application, 26th Apr., 1892
Complete Specification Left, 26th Jan., 1893-Accepted, 4th Mar., 1893
PROVISIONAL SPECIFICATION.
Improvements in Multiple Drilling Machines.
I FREDERICK WILLIAM GOLBY of 36 Chancery Lane, in the County of
Middlesex, Patent Agent do hereby declare the nature of this invention as com-..
municated to me by Edmond Blanc, Engineer, of Montpellier, France, to be as
follows:-
The
This invention relates to a multiple drilling machine in which three drills are fed
to the work simultaneously. The invention is specially adapted for drilling holes.
in marble and such like hard stones, but may be used for drilling other materials.
The drill stocks are supported vertically side by side in a suitable frame, their
upper ends being screw threaded and working through fixed horizontal nuts.
two outside drill stocks are screw threaded in an opposite direction to the inside
one, the nuts being made to correspond. The lower ends of the drill stocks are
preferably rectangular in cross section and pass loosely through correspondingly
shaped central apertures in cog wheels gearing together. These gear wheels are
free to rotate on a horizontal platform and may if desired run on friction rollers or
ball bearings.
Motion is imparted to the central drill stock, and by the gear wheels is transmitted.
to the outside drill stocks which by means of the oppositely threaded screws thereon
travel upwards or downwards with the central drill stock, so that all three drills..
advance or retire simultaneously.
Dated this 26th day of April 1892.
F. W. GOLBY,
36, Chancery Lane, London, W.C.
COMPLETE SPECIFICATION.
Improvements in Multiple Drilling Machines.
FREDERICK WILLIAM GOLBY of 36 Chancery Lane, in the County of
Middlesex, Patent Agent, do hereby declare the nature of this invention as com--
municated to me by Edmond Blanc of Montpellier, in the Republic of France,
Engineer, and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
1
This invention relates to a multiple drilling machine in which three drills are fed
to the work simultaneously. The invention is especially adapted for drilling holes
in marble and such like hardstones, but may be used for drilling other materials.
The
The drill stocks are supported vertically side by side in a suitable frame, their
upper ends being screw threaded & working through fixed horizontal nuts.
two outside drill stocks are screw threaded in an opposite direction to the inside
one, the nuts being made to correspond. The lower ends of the drill stocks are
preferably rectangular in cross section and pass loosely through correspondingly
shaped central apertures in cog wheels gearing together. These gear wheels are
free to rotate on a horizontal platform and may if desired run on friction rollers or
ball bearings.
Motion is imparted to one drill stock and by the gear wheels is transmitted to
the others which by means of the threaded screws thereon travel upwards or down-
wards, so that all three drills advance or retire simultaneously.
In the accompanying drawings
Fig. 1. is a front elevation, and Fig. 2. a sectional side elevation of a machine
made according to this invention.

page_text: A. A is a strong frame connected by crossbars, and B B are the fixed nuts in the
upper cross bar thereof through which pass the threaded upper ends C of the drill
stocks D. F F are the cog wheels whose bosses are of an angular shape corre-
sponding to the shape of the lower ends of the drill stocks which can pass loosely
through said bosses. E is the horizontal platform or lower cross bar on which the
gear wheels F are free to rotate, and I. 1 and I are the drills which are secured
to the stocks in any well known manner.
From the foregoing description it will be understood that if rotary motion is
imparted to one of the drills stocks, the screw C thereon will cause the said drill
stock to travel in a spiral direction upwards or downwards according to the direction
of the original rotation and that, by means of the geared cogs and the reverse
threads C and nuts B, the other two drills will travel spirally in the same direction
and to the same extent simultaneously.
To facilitate the moving of the machine across the material operated upon it may
be fitted with wheels or mounted on a carriage.
Having now particularly described and ascertained the nature of this said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
A multiple drilling machine comprising a frame carrying three fixed nuts
arranged in line, the two outer being oppositely threaded to the central one, corre-
spondingly threaded drill stocks working through said nuts and having their lower
ends angular in cross section and passing through suitably shaped bosses in cog
wheels gearing with each other, so that rotary motion imparted to one of said drill
stocks will produce simultaneous upward or downward spiral travel of all the three
drill stocks substantially as and for the purpose described and shewn.
Dated this 20th day of January 1096
Jated tNIS ZOLO day o O&uary 100
F. W. GOLBY,
36, Chancery Lane, London, W.C.
F. W. GOLBY,
36, Chancery Lane, London, W.C.