FIELD OF INVENTION
The invention relates to an improved torque transfer mechanism from the
drive to the Casing line spooler unit disposed in oilrigs. More Particularly the invention
relates to a positive torque transfer mechanism, which will not fail in the event of Jamming
of the Casing line or wire line during spooling in or spooling out as required at the oilrig
site.
BACKGROUND OF THE INVENTION
The casing line spool unit or the Wire line spool unit is used in Oilrigs to pull
out old and worn out steel wire ropes from the Draw works of Oil Rig, or to feed in fresh/
new wire ropes to the Oilrigs. According to the prior art of the equipment, the transfer of
the torque is by means of a forked end in the shaft into which a normal flat faced end of
the drive shaft is interspersed. The forked end transmits the torque to the flat face when
the motor is switched on. The braking of the unit is realized by means of a manual band
brake which is fitted on to the shaft unit. The torque transfer from the shaft to the wire line
spool unit or the casing line spool unit is again achieved by means of taper bush units
fitted on either ends of the shafts.
The prior art device has the following limitations/deficiencies:
01) The fork which is used to transfer the torque from the motor to the Spool unit
bends outwards whenever there is a resistance to the rotary motion due to
jamming in the wire line unit or due to obstruction of the wire at any point.

2) The manual brake provided along with the unit to stop the motion is limited by
the operator's alertness and the speed with which he will be able to apply the
manual brake.
3) The transfer of torque limited to the taper bush alone is inadequate to address
the situation when the bush due to quality of assembly can come out of its
location and will not provide a uniform load transfer to the wire line unit/casing
line spool unit.
Hence, there exist a need to improve the mechanism of transfer
of torque from the drive unit to the rotating device called the Casing line spooler unit or
wire line spool unit used in oilrigs.
OBJECTS OF THE INVENTION
Therefore, it is an object of the invention to propose an improved torque
transfer mechanism from the drive to the casing line spooler unit disposed in oilrigs which
is capable of eliminating the disadvantages of prior art.
Another object of the invention is to propose an improved torque transfer
mechanism from the drive to the casing line spooler unit disposed in oilrigs which is able to
facilitate dismantling of the driven unit without disturbing the driving mechanism.
A further object of the invention is to propose an improved torque transfer
mechanism from the drive to the casing line spooler unit disposed in oilrigs which ensures
a positive torque transfer, which will not fail in the event of jamming of the casing line or
wire line during spooling in or spooling out as required at the oilrig site.

A still further object of the invention is to propose an improved torque
transfer mechanism from the driven shaft to the casing line spooler unit, by means of a
Taper bush having a Flange inbuilt with jaws with a slit all through, disposed in oilrigs
which can make the drive to be accomplished in both the direction of rotation. (This
feature though available in the prior art has limitations leading to instantaneous failure).
A still another object of the invention is to propose an improved torque
transfer mechanism from the drive to the casing line spooler unit disposed in oilrigs which
can facilitate braking of the unit by means of electric brake inbuilt into the Gear motor unit
disposed in the Oilrigs which eliminates the manual brake of the prior art.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Fig.l - Shows the complete assembly of the casing line spooler unit according to the prior
art.
Fig.2 - Shows the drive shaft of the Torque transfer mechanism according to the prior art.
Fig.3 - Shows the Torque transfer mechanism of Prior art. Where shaft (2) in the Fig.3
receives the torque from drive (1) of Fig. 2.
Fig.4 - Shows the existing set up in the prior art where the item 1 of the drive gives the
torque to the shaft 2 during the normal operation according to prior Art.
Fig.5 - Shows the bending of shaft 2 when the rope gets stuck and shaft 2 becomes
stationary while the drive 1 applies the torque at the time when the wire rope gets
stuck according to prior art.
Fig.6 - Shows the new octagonal flange unit (3) according to the invention.
Fig.7 - Shows the octagonal shaft end (4) according to the invention which replaces the
shaft (2) of the prior art.
Fig.8 - Shows the existing taper bush (5) as used in prior art.
Fig.9 - Shows a flange inbuilt with Jaws at 120° according to the invention.
Fig. 10 - Torque Transfer mechanism according to the invention.

DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION
According to the invention, there is provided a means of positive torque
transfer which will not fail in the event of jamming of the wire line of Casing line during
spooling in or spooling out as required at the oilrig site. The invention provides distinct
advantages over the prior art as follows:
a) A solid octagonal key type torque transfer mechanism to ensure positive drive.
b) A sliding mechanism inbuilt into the device to facilitate easier dismantling as
and when required.
c) A flange on the sliding octagonal member to ensure positive drive from the
gear motor unit.
d) The flange is provided with holes on a pitch circle diameter to enable fit up of
pins for torque transfer.
e) In the eventuality of any emergency the same can be slided off very quickly
and prevent any damage to the equipment or personnel working
Accordingly in the first aspect of the invention, there is provided a flanged
octagonal bush (3) which slides on the rectangular portion of the driven shaft (4)
mechanism to facilitate easy and quick assembly/disassembly with the counter flange
provided on the output flange of the gear-motor unit. There is a gap between the shaft
end of the gear-motor unit and the shaft of the driven unit to enable removal of the shaft
assembly to insert new spools from time to time. The invention is innovative / creative in
the aspect of facilitating dismantling of the driven unit without disturbing the driving
mechanism.
The second aspect of the invention is to make use of the taper bush for the
centering of the Spool unit with the shaft to a large extent and for providing drive to the

driven unit to a small extent. The positive drive from the shaft to the spool is achieved by
means of a flange inbuilt into the taper bush with jaws positioned at 120°. The jaws are
shaped to accommodate themselves in line with three keys arranged on the spool unit at
120°. The invention is such that the drive can be accomplished in both the directions of
rotation. Another aspect of the invention is provision of an axial slit in the taper bush for
positive grip.
Figurel shows the complete assembly of the casing line spooler unit that is as
per the Prior art. Figure 3 and Figure 2 show the mechanism as being used in the prior art.
The same when being used at Sites is leading to failures. Figure 4 shows the existing set
up in the prior art where the item Drive (1) gives the torque to the Shaft (2) during the
normal operation and the figure 5 shows the bending of Shaft (2) when the rope gets stuck
and Shaft (2) becomes stationery while the Drive (1) applies the torque at the time when
the wire rope gets stuck.
Figure 6 shows the new octagonal sliding flange unit (3) Figure 7 shows the
octagonal shaft end (4) which replaces the Shaft 1 of the prior art. The sliding flange 3
with additional length is mounted on to new shaft (4) with a facility to move the Octagonal
flange (3) when dismantling/disassembly is required. The Sliding Octagonal flange (3) in
Figure 6 and another counter flange (replacement of Drive (1) of prior art - Not shown
here) facilitate the transfer of the torque without resulting in failure of any kind.
Figure 8 shows the existing taper bush (5) used by the prior art. Figure 9 shows
the taper bush (5A) inbuilt with a flange (6) with jaws at 120° according to the invention.
The jaws transfer the torque on to the spool unit, on which Keys are welded to enable the
unit take the rotary motion. This way there is positive motion without any slip. The slit (2)
in the jawed flange 6 facilitates better grip than the normal taper shown in figure 8 (Prior
art).

As shown in the figure 6 and 7 the invention is developed to overcome the problem of
failing drive unit during operation of the Casing line spool unit which is shown in the figure
4 and 5. The Octagonal sliding flange 3 is accommodated on the Octagonal Key machined
on the Driven shaft 4 with sufficient additional length to facilitate movement of the Sliding
flange during disassembly operations. The Flange 3 on the Octagonal member is provided
with suitable number of holes 8 with matching holes on the counter flange on the Gear-
motor unit. In view of the invention the problems faced by users as per the prior art is
overcome and the process of dismantling simplified by just sliding the octagonal flange unit
as shown in the invention. The jawed Flange (6) (Figure 9) with a slit (7) also facilitates
better grip and ensures positive drive from the shaft 4 to the Spool unit.

WE CLAIM
1. An improved torque transfer mechanism from the drive to the casing line
spooler unit disposed in oilrigs comprising;
a sliding flanged octagonal bush (3) with matching holes on the pitch circle diameter for
fixing with counter flange on Gear-motor unit;
A shaft with Octagonal Key end (4);
a taper bush in built with a flange (6) with 3 Jaws at 120° for transferring the torque;
Characterised in that,
The octagonal flange (3) with additional length and mounted on the octagonal key
machined on the Circular shaft at the end (4) facilitating a sliding movement of the
octagonal flange for dismantling or disassembly of the unit and engaged with counter
flange for facilitating the transfer of the torque without any failure wherein the taper bush
(5A) with a flange (6) with Jaws transfers the torque on to the spool unit having keys
welded for enabling the unit take the rotary motion without any slip.
2. An improved mechanism as claimed in claim 1, wherein the slit (7) disposed in
the jawed flange (6) facilitates better grip for ensuring positive drive from the shaft (4) to
the spool unit.
3. An improved mechanism as claimed in claim 1 and 2, wherein the taper bush 5A
is disposed for the centering of the spool unit with the shaft and for providing drive to the
driven unit.
4. An improved mechanism as claimed in claim 1 to 3, wherein the jaws in built
with the taper bush are formed 120° apart for accommodating them in line with three keys
arranged on the spool unit at 120°.
5. The process of an improved torque transfer mechanism claimed in claim 1
comprising;

fixing a sliding flanged octagonal bush (3) having matching holes on the pitch circle
diameter with counter flange on gear motor unit to transfer the torque from the drive to
the spool unit;
accommodating the sliding flange (3) with additional length on the octagonal shaft (4) to
facilitate the movement of the flange (3);
deploying the taper bush (5A) to center the spool unit with the shaft (4);
where in the taper bush (5A) is in built with a flange (6) having jaws positioned at 120° to
accommodate them in line with three keys arranged on the spool unit at 120° when the
jaws transfer the torque on to the spool unit.
6. The process as claimed in claim 5, wherein the transfer of the torque from
the motor unit to the flange (3) is accomplished by deploying shear pins on the pitch circle
diameter of the flanges.

ABSTRACT

An improved torque mechanism from the drive to the Casing line spooler unit
disposed in oilrigs comprising a flanged octagonal bush (3) with matching holes on the
pitch circle diameter for fixing with counter flange on Gear-motor unit, a taper bush in built
with a flange (6) with Jaws at 120° for transferring the torque and an octagonal shaft (4)
when the octagonal flange(3) with additional length and mounted on the octagonal key
machined on the octagonal shaft end (4) facilitating a sliding movement of the octagonal
flange for dismantling or disassembly of the unit is engaged with counter flange for
facilitating the transfer of the torque without any failure where in the taper bush (5A) with
a flange (6) with Jaws transfers the torque on to the spool unit having keys welded for
enabling the unit take the rotary motion without any slip.