Improved Apparatus for Drilling and Tapping Gas and Water Mains and other Iron Articles.
Year: 1894

page_text: Date of Application, 5th June, 1894-Accepted, 18th Aug., 1894
COMPLETE SPECIFICATION.
Improved Apparatus for Drilling and Tapping Gas and Water Mains
and other Iron Articles.
JAMES MCNAIR Corporation Gas Works Wishaw, Lanarkshire, Gas Manager
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 is an improved device for drilling and tapping water and gas mains
or other iron articles. The invention consists in the devices, and combination of
devices, hereinafter more fully set forth in the accompanying drawings.
Figure I represents my device as applied to a main
Figure II represents a front view showing a cross section of the main
Figure 111 shows the back view of the device.
In the figures
B1, B2, D1, F1, and K1 show views of the detail of my device.
a main is shown at W. The apparatus is shown placed upon that main and the
chain S is used to pass under the main and hooked on to the part marked L which
is a double hooked nut & which passes between the uprights P & which the bolt H
lowers or raises. So soon as the chain has been placed in position the bolt marked H
is screwed up and by the screwing of that bolt the chain is so tightened and the
device so drawn upon the main that it is then ready for commencing the operation
of boring. The device itself is composed of four upright standards marked P with
a base shown at the letter O. The base having a suitable angle to fix upon the
main. The uprights are separated by collapsible stays shown by the letters K and M
The
and those are fixed together by bolts shown by the letters J. V. & U.
uprights support a bracket A a plan of which is shown at A 1. The ratchet brace
is composed of the cylinder C and the handle N and a ratchet wheel F.
The cylinder E with a slot which is shown under D1 at r and a bolt with a screw
is shewn at Q. B1 is a plan of B and B 2 is a section of B1 cut through the
line R, S. on B 1. D1 is a section of D I cut through D I on Figure I and
Figure F is a plan of F.
The main is bored or tapped by working the handle N and as the boring proceeds
the bolt Q is tightened so as to allow cylinder E to pass down the cylinder C and
to tighten the bit in the main. After the main has been tapped the apparatus is
removed by simply unscrewing the bolt H and removing bolt J. The apparatus
can be folded together and easily carried along with a tradesmens other tools, the
whole apparatus being about 18 pounds in weight. The device may be so con-
structed that by removing the parts marked T and B any ordinary ratchet can be
fitted in and applied to the boring of mains.
G is a small bolt with tapered point which passes through A to prevent Q from
rubbing on the underside of A.
Having now described and ascertained the nature of my invention and in what
manner the same is to be performed I declare that what I claim is
(1) The hereinbefore method of drilling and tapping water or gas mains, pipes
and similar articles consisting of a device substantially as specified.
(2) A combination consisting of vertical standards with diagonal and horizontal
stays and fitted with ratchet having a moveable cylinder with threaded bolt
therein substantially as specified.

page_text: (3) A combination consisting of vertical standards diagonal and horizontal stays.
with ratchet having moveable cylinder with threaded bolt therein the same fitted
and provided with a vertical screw and double hooked nut substantially and for the
purpose as specified.
JAMES MONAIR.