The present invention is directed to an apparatus for mounting a drill
on a pipe as defined in the preamble of claim 1. Use of an apparatus to enable a
drill to be held in a steady position whilst boring a hole into a pipe is considered
advantageous. The use of such apparatus will enable a secondary branch pipe to be
fitted and welded directly into the main pipe which has been bored. Such apparatus
for holding a drill steady during a boring operation is of particular assistance
when fitting a secondary pipe in situ.
It is known to provide a system for holding a drill steadily to a
pipe to be bored by using magnetic attraction. Such systems would generally include
an electromagnetic member which, when energised, will hold a drill stand rigidly
to a metallic pipe so that a drill mounted on the stand may bore a hole in a defined
position on the pipe.
In certain circumstances, however, the use of such magnetically mounted
systems is problematical. In environments which are particularly sensitive to electrical
or magnetic fields, such as radar installations or computer factories, this type
of equipment cannot be used. Alternatively there may be situations in which the
pipe to be bored comprises a non-magnetic material such as stainless steel, brass
Additionally, in the event of using a magnetically mounted drill for
boring into a pipe, a separate safety chain is necessarily used because in the event
of a power failure to the electromagnetic clamp, care needs to be taken to ensure
that the entire apparatus does not fall and injure operators who may be standing
US-A-4094612 (nearest state of the art) discloses an arrangement for
fixing a drill stand in position whilst drilling into a pipe. The drill stand is
magnetically mounted onto a ferromagnetic plate. The plate is secured to the pipe
by a chain-whip clamping arrangement. The drill may only move in a direction radially
toward or away from the pipe and still suffers the disadvantages associated with
magnetic mounting - such as not being able to withstand large forces without becoming
dislodged from the plate.
The aforementioned known types of mounting arrangement also tend to
be relatively inflexible in their use. Once they are mounted on the pipe to be bored,
relative movement between the drill its mount and the pipe is not possible. Thus
a very high degree of alignment between the drill and pipe must be obtained before
firmly clamping the system in place. This tends to create an inflexible arrangement.
It is thus an object of the present invention to at least alleviate
the aforementioned shortcomings.
This object is achieved by the features of claim 1.
By allowing the drill press stand to be adjusted relative to the platform,
a more flexible arrangement is provided than has more hitherto been the case.
Preferably a means for clamping the platform on a pipe to be drilled
comprises a backplate shaped to fit against the pipe, and means for attaching the
platform to the backplate, with the pipe sandwiched therebetween. This arrangement
is of particular benefit when being used in an environment such as sprinkler systems
and high pressure pipe work which tends to be found on condensers in large ships.
Because this type of pipe work has its own characteristics, the use of a backplate
to sandwich the pipe between the backplate and the platform enables a rigid and
solid clamping arrangement to be provided.
Alternatively, the means for clamping the platform on a pipe to be
drilled may comprise a member, extendible from one portion of the platform to another
portion of the platform and releasably connectable to both portions thereof, which
member passes at least partway around the outer periphery of the pipe, thereby clamping
the platform on the pipe. This form of mounting arrangement provides for a quick
and easy clamping of the platform to the pipe. Preferably the surface of the platform
may be arranged about a pipe to be drilled and is shaped to form a V-groove. This
enables accurate alignment between the platform and the pipe. Alternatively the
one and/or the other portions of the platform include means for adjusting the tension
in the member this allows accurate control of the pressure applied to clamp the
apparatus to the pipe, thereby ensuring no damage to the pipe occurs. Preferably
the means for adjusting the tension comprises a screw-threaded detent. Preferably
the member comprises a chain.
In a preferred embodiment of the present invention, the means for
mounting the drill press stand on the platform comprises a pillar housing for receiving
the pillar of the drill press stand. In this manner a drill press stand for carrying
a drill may be readily mounted to the apparatus.
Advantageously the drill press stand may be mounted by bolts extending
through elongate holes in the platform to allow the drill press stand to be slidably
adjusted relative to the platform. This enables accurate alignment between the drill
and that part of the pipe to be drilled.
The present invention will now be described, by way of example only,
and with reference to the accompanying drawings in which
- Figure 1 illustrates a perspective view of a backplate for use with a first
embodiment of the present invention;
- Figure 2 shows a perspective view of a base member of a platform in accordance
with this first embodiment of the present invention;
- Figure 3 shows a perspective view of a frame for use with the base member of
- Figure 4 shows a perspective view of the entire apparatus in accordance with
the first aspect of the present invention including a drill press stand and drill
operating on a pipe;
- Figure 5 shows a perspective view from above of an apparatus in accordance with
a second aspect of the present invention;
- Figure 6 shows an end view of the apparatus of Figure 5, and;
- Figure 7 shows a view from above of the embodiment of Figure 5 but without the
drill and the drill press stand.
Referring firstly to Figures 1 to 4 which illustrate a first embodiment
of the present invention, and particularly Figure 1, it can be seen that a backplate
1 is arranged to fit around a pipe 7. The backplate 1 is formed to have side flanges
2 which provide extra strength for the backplate 1. The backplate 1 is fitted around
a pipe 7 and, in this example, there is little clearance between the pipe 7 and
an adjacent wall or other surface 5. The backplate 1 has formed therein a hole which
accepts a threaded screw 3. By adjusting the protrusion of the threaded screw 3
from the backplate 1, the backplate 1 may be held in contact with the pipe 7 due
to the head of the screw 3 contacting the wall 5. This provides advantage in that
it holds the backplate 1 steady until such times as the remainder of the apparatus
may be brought into contact therewith and the pipe 7 clamped therebetween.
The backplate 1 has formed therein a plurality of holes through which
may pass bolts 11. The bolts 11 are rigidly held in position in the backplate 1
by way of locking nuts 13. Although not shown in the drawing, there are provided
four bolts 11 and eight locking nuts 13.
Figures 2 and 3 show respectively a base member 9a and frame 25 which
are coupled together to form a platform 9.
Referring now also to Figure 2 it can be seen that a base member 9a
of a platform 9, formed of metal includes four holes 15 bored therein, through which
the bolts 11 may pass. In this manner therefore the platform 9 may be coupled to
the backplate 1 in order to sandwich the pipe 7 therebetween. The platform is held
on the bolts 11 by way of tightening nuts 17.
It can be seen from Figure 2 that the base member 9a includes flanges
10, 19 which are folded to provide extra strength to the platform 9. Furthermore
steel angle pieces 20 and 21 provide yet more strength to prevent any tendency for
platform 9 to be bent if the nuts 17 are overtightened. It will be seen that a hatched
line 23 indicates the centre line of the pipe 7 when clamped between the backplate
1 and platform 9.
It will be apparent that the platform 9 only contacts the pipe 7 at
each end where the angled pieces 20 and 21 are fitted. This prevents any possibility
of the platform 9 contacting any uneven surfaces on the pipe 7 which could cause
a platform 9 to rock along the centre line 23 of the pipe 7. The end flanges 10
of platform 9 are folded before the steel angle pieces 20 and 21 are fitted. It
will thus be appreciated that in the embodiment shown with reference to figures
1 and 2 that the means for clamping the platform 9 to the pipe 7 comprises the backplate
1 and the arrangement of the bolts 11 and nuts 13 and 17.
Referring now also to Figure 3 it will be seen that a frame 25 is
arranged to be mounted on the base member 9a by way of mounting holes 33 formed
in the base member 9a and corresponding mounting holes 33 formed in the frame 25.
Although not shown in the drawings it will be understood that bolts pass through
the holes 33 in order to rigidly clamp (via nuts) the frame 25 to the base member
9a to form the platform 9.
The frame 25 has formed therein a plurality of elongate holes 35.
Through each of these holes passes a coach bolt 39, which coach bolts themselves
mount into corresponding bolt holes 41 formed in a means for mounting a drill press
stand, here casting 37 which can be seen from Figure 4.
By selectively tightening or slackening the tension between each coach
bolt 39 and the bolt hole 41, the casting 37 may be allowed to slide laterally from
left to right as looking at Figure 4 until such times as the tension is reapplied
to rigidly clamp the casting 37 to the frame 25. Such adjustment is desirable in
order to allow the accurate alignment of the drill to be used with the pipe 7, as
will be described herebelow.
Referring now particularly to Figure 4 it can be seen that the casting
37 has mounted therein a pillar 49 of a drill press stand 47. Drill press stands
are known in the art and so will not be described in detail herein. Mounted on the
drill press stand is a drill 51 including a chuck 55 and a borer 53 mounted in the
chuck 55. It will be understood that by rotation of the drill press stand handle
45 the drill 51 may be advanced towards or away from the pipe 7. In this way therefore
the borer 53 may be brought selectively into contact with the pipe 7.
The longitudinal relationship between the borer 53 and the platform
9 (which is rigidly clamped to the pipe 7 in Figure 4) may be adjusted according
to the discussion above with reference to Figure 3. Particularly, therefore, by
slackening the coach bolts 39 the longitudinal travel of the casting 37 via elongate
holes 35 may be undertaken. This permits the longitudinal location of the borer
53 from the platform 9 along the centre line 23 to be selected by a user of the
apparatus. This method of adjustment is also to allow the position of the hole being
drilled to be situated as close to the platform 9 as possible. This is desirable
so that the clamping force of the four bolts 11 is as near to the pressure point
of the borer 53 as is possible. In Figure 4 only two bolt holes 41, three holes
33 and a small part of backplate 1 are visible. A distance piece 59 and nut 17 are
shown in exploded view. When not in use the whole assembly 45, 47, 49, 51, 53 and
55 may be removed from the casting 37 by slackening release screws 57 in the casting
37. Additionally bushes (not shown) may be supplied to suit different pillar sizes
for different types of drill press stand.
Referring now to Figures 5,6 and 7, wherein corresponding components
are similarly numbered to those above, it can be seen that on an alternative embodiment
of the present invention is illustrated.
It can be seen from these figures that the platform 9 no longer couples
to a separate backplate. Instead the means for clamping the platform 9 to a pipe
7 to be drilled comprises a member extendible from one portion of the platform to
another portion of the platform. In this embodiment the member comprises a chain
100 formed from a plurality of metallic links which extends from one side of the
platform 102 to another side of the platform 104. It can be seen that the platform
9 includes a V-shaped flange member 106 which is equivalent to the base member 9a,
and a U-shaped member 25' which is equivalent to the frame member 25 of Figure 3.
In this example, the U-shaped member 25' is formed integrally with the member 106
although they may be formed as separate members subsequently welded together if
desired. Each side portion 102, 104 of the platform 9 carries a turret 108. Within
each turret 108 is housed a screw threaded member which may be rotated manually
by rotatable knobs 110, 112. Rotation of the knobs 110, 112 causes the screw thread
to rotate and thereby selectively move up or down (as viewing Figure 6) a detent,
in this example a metal hook 114. Each end of the chain 100 may be placed over the
end of each hook 114 and thereby the tension in the chain may be adjusted for clamping
the pipe 7 by the tension in the chain on either side of the V groove 106 (the portion
102 and portion 104). It will be apparent that only one of the hooks 114 needs to
be attached to a screw thread member adjustable by its respective knob 110 or 112.
It is advantageous that both turrets 108 include an adjustable screw thread member,
but this is not imperative.
When the drilling operation has been finished and it is desired to
remove the platform 9 from the pipe 7 then this is simply a matter of the user rotating
either of the knobs 110, 112 until the tension in the chain 100 has slackened off
sufficiently for the chain 100 to be removed from a hook 114.
Once again, in common with the previous embodiment, the platform 9
has formed therein a plurality of elongate holes 35. The casting 37 is allowed to
travel longitudinally along the holes 35 by way of coach bolts 116 passing through
the casting 37 and into the platform 9 in the same manner as with respect to the
embodiment of Figures 1 to 4. In the embodiment of Figures 5 to 7, the coach bolts
116 may be adjustable by rotatable knobs 118 formed on the upper surface thereof.
By rotating the knobs 118 the tension placed upon the casting 37 by the coach bolts
116 may be adjusted and in this manner therefore the casting 37 may travel along
the elongate holes 35, as has been discussed hereabove.
The drill press stand 47 and associated drill 51 as shown in Figure
5 are the same as have been shown hereabove with reference to Figure 4 and so will
not be discussed any further herein. Those skilled in the art will appreciate that
the method of operation is the same as in the above embodiment.