Improvements in Pipe Boring Tackle.
Year: 1895

page_text: Date of Application, 16th Apr.. 1895
Complete Specification Left, 16th Jan., 1896-Accepted, 16th May, 1896
Improvements in Pipe Boring Tackle.
We, JOHN MEREDITH WALLACE and THOMAS WILLIAM WALLACE, both
Millwrights and Engineers, of 16 Bridgegate, Peebles, in the County of Peebles,
Scotland, do hereby declare the nature of this invention to be as follows:-
This invention has for its object to provide a ready method of fixing a cramp to
pipes for the purpose of using a ratchet brace or other boring instrument and it is
specially applicable to pipes laid in position such as gas, water, or steam pipes, aud
to pipes of various sizes. In the boring tackle, as hitherto in use, one great
difficulty has been found in fixing the cramp to the pipe to be operated upon,
owing to the great variety of sizes of pipes and the confined positions in which
pipes are often placed.
According to our invention we fix the cramp that is to hold the brace or boring
instrument to the pipe by means of a block chain, which is passed round the pipe
and hooked on to a stud on the cramp-foot. The other end of the chain is fastened
with a screw and thumb nut to tighten it round the pipe.
The base of the cramp is preferably made of V shape and longer at the back
than the arm projects in front so that it has sufficient resistance to sustain the
strain.
The body of the cramp may be of the usual form with crop head and screw.
Dated this 12th day of April 1895.
improvements in ripe boring
We, JOHN MEREDITH WALLACE and THOMAS WILLIAM WALLACE, both
Millwrights and Engineers of 16 Bridgegate, Peebles, in the County of Peebles,
Scotland, 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 has for its object to provide a ready method of fixing a cramp to
pipes for the purpose of using a ratchet brace or other boring instrument and it is
specially applicable to pipes laid in position, such as gas, water, or steam pipes, and
to pipes of various sizes. In the boring tackle, as hitherto in use, one great
difficulty has been found in fixing the cramp to the pipe to be operated upon,
owing to the great variety of sizes of pipes and the confined positions in which
pipes are often placed.
According to our invention we fix the cramp that is to hold the brace or boring
instrument to the pipe by means of a block chain, which is passed round the pipe
and hooked on to a stud on the cramp-foot. The other end of the chain is fastened
with a screw and thumb nut to tighten it round the pipe.
The base of the cramp is preferably made of V shape and longer at the back

page_text: than the arm projects in front so that it has sufficient resistance to sustain the
strain.
The body of the cramp may be of the usual form with crop head and screw.
And in order that our said invention may be properly understood we have
hereunto appended an explanatory sheet of drawings, whereon,
Fig. 1 is a front view of the device, and
Fig. 2 is a side view.
In these figures the cramp is shown as fixed in position on the pipe to be
operated upon.
In Fig. 2 the ratchet is removed.
As will be seen, on reference to the drawings, the cramp B is made with a base A,
of inverted V form so as to partly straddle the pipe and also with a rearwardly
projecting heel part A¹ which gives sufficient resistance to sustain the strain caused
by the ratchet G or other boring instrument when drilling the pipe.
The chain C is secured, at one end, by means of a long screw D passed through
the projecting lug A' of the base A, and, at the other end, it is hooked on to a stud
or hook E at the opposite side of the base of the cramp. The chain can be hooked
on the stud at any link suitable to enable it to embrace the pipe F. The chain can
be tightened up by means of a nut D¹ on the screw D to such a strain as is sufficient
to hold the cramp in position.
Hitherto it has been usual, when boring pipes, to place the cramp at right angles
to the line of the pipe, in consequence of which, the boring tool was apt to slip.
The base of the cramp was placed at the underside of the pipe.
Under our invention the cramp can be secured in the line of the pipe so that the
resistance of the boring tool helps to steady the tackle and give a much firmer grip.
Also, by having the base of the cramp on the upper side of the pipe, the tackle can
be adjusted to a greater variety of sizes of pipes. The tackle occupies much less
space laterally as it surmounts the pipe and it is therefore specially suited for use
in the confined positions in which pipes are often situated.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we consider novel and desire to claim is:-
1. A cramp made with an inverted ✓ shaped base having a rearwardly
projecting heel (A¹) substantially as and for the advantages hereinbefore set
forth.
2. The combination with the cramp, of a chain for embracing the pipe secured
to the cramp, at one end, by a screw, and, at the other end, by a stud or hook,
substantially as herein before described with reference to the drawings annexed.
Dated this 30th day of April 1896.
H. D. FITZPATRICK,
70 Wellington Street, Glasgow, Agent.