FORM2
THE PATENTS ACT, 1970
(39 of 1970)
&
The Patents Rules, 2003
COMPLETE SPECIFICATION
(See section 10; rule 13)
1. Title of the invention. - AN IMPROVED FUSE PULLING DEVICE
2. Applicant(s)

(a) NAME : LARSEN & TOUBRO LIMITED
(b) NATIONALITY: An Indian Company.
(c) ADDRESS: L & T House, Ballard Estate, Mumbai 400 001,
State of Maharashtra, India
3. PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the invention and the manner in which it is to be performed:

FIELD OF THE INVENTION
The present invention relates to fuse pullers devices which are used to extract the fuse link from the fuse holders. More particularly, the present invention relates to an improved fuse pulling device that is adapted for pulling the fuses/fuse links from the fuse tags/fuse holders which are present on the end plates and done with the help of a fuse pulling handle, which is push button actuated.
BACKGROUND AND PRIOR ART OF THE INVENTION
Fuse pullers that are devices which are used to extract the fuse link from the fuse holders.
Fuse links are mounted on the Switch Disconnector Fuse which is a protection device in the Electrical Power System. In case of overcurrent and faults the fuse link blows disconnecting the load from the power grid. Fuse pullers are devices which are used to extract these fuse links from the fuse holders of the Switch Disconnector Fuse.
Conventionally, the fuse pulling handle has lever oriented mechanism by which it locks the fuse tags. These can be unlocked by pushing the button and releasing the lever.
After the fuse links operate, it gets very difficult to remove them from the fuse holders and requires a good amount of force and precision.

OBJECTS OF THE INVENTION
One object of the present invention is to overcome the disadvantages / drawbacks of the prior art.
A basic object of the present invention is to provide an improved fuse pulling devices which are used to extract the fuse link/fuse from the fuse holders/fuse tags.
Another object of the present invention is to provide improved fuse pulling device having a fuse pulling handle, which is push button actuated.
These and advantages of the present invention will become readily apparent from the following detailed description taken in conjunction with the accompanying drawings.
SUMMARY OF THE INVENTION
According to one aspect of the present invention there is provided an improved fuse pulling device adapted for pulling the fuses/fuse links from the fuse tags/fuse holders. said device comprising :
a pair of modules, wherein each of said modules comprising :
(i) a first means and a second means substantially adjacent to each other, said second means having a slot means substantially molded on outer end of said second means ;
(ii) a shaft means operatively associated with said first means and assembled inside said slot means, said shaft means substantially originating from said first means , wherein said shaft means comprising substantially threaded protrusion means protruding from said slot means;

(iii) a pair of grooves ,said each groove is molded inside said each
module, wherein said pair of grooves are substantially
transversal to each other; (iv) an energy storing means operatively positioned in-between
said first and second module; (v) a handle means substantially secured between said first means
and second means; (vi) a knob means assembled within said thread means adapted to
adjust length of said handle means; (vii)a pair of curved means substantially having hook like modular
structure , said each curved means is substantially
accommodated inside each groove; such that said pair of curved means are substantially toggled 90 ° to complement each other forming a substantially cage type lock adapted for gripping the fuse /fuse links.
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to an improved fuse pulling device which can be used to pull any size of fuse link.
The device is a unique hook based fuse pulling device which is simple in construction and can be used for fuse links of various sizes. The invention has 90 ' toggle type hooks and an adjustable handle grip which as the name suggests can fit fuse-links of different sizes.
The present system involves pulling the fuses from the fuse tags which are present on the end plates. This is done with the help of a fuse pulling handle, which is push button actuated.

The improved fuse pulling device adapted for pulling the fuses/fuse links from the fuse tags/fuse holders. The device comprises a pair of modules.
The pair of modules comprises a first means and second means which is substantially adjacent to each other where the second means having a slot means substantially molded on outer end of the second means , a shaft means operatively associated with the first means and assembled inside the slot means where the shaft means is having a thread means substantially protruding from the slot means ,a pair of grooves where each one of the groove is molded inside said each one of the module where the pair of grooves are substantially transversal to each other, an energy storing means operatively positioned in-between the first and the second module ,a handle means substantially secured between the first means and the second means where the handle length is adjustable to fit fuse links/fuse of different size and pull the fuse link out of the fuse holder, a knob means assembled within the thread means to adjust length of the handle means, a pair of curved means substantially having hook like modular structure where each one of the curved means is substantially accommodated inside each groove .
The pair of curved means are substantially toggled 90 0 to complement each other forming a substantially cage type lock for gripping the fuse /fuse links in functional operation. The pair of curved means is toggled substantially 180 ° in operation to reach fuse knife of the fuse link for fuse link dismantling operation.
The slot means is cylindrical and the energy storing means comprises compression
spring.
The spring is provided for continuous tension to drive the pair of modules away from
each other.

The knob means is operatively connected with the handle to adjust the length of the handle. The knob means tightened decrease the length of the handle means. The knob means loosened to increase the length of the handle means.
Features:
• The present device uses a complicated lever-hinge mechanism. This invention has a unique hook based mechanism which is very simple in its construction and easy to implement.
• The present devices require the user to grip the fuse tags of the fuse link with the fuse pulling handle which requires a considerable amount of force for dismantling the fuse link from the switch. This invention uses knife gripping hooks significantly reducing the amount of force required for the operation since the hooks grip the fuse knife.
• The present devices are very sensitive to on-field manhandling and this causes frequent loss of functionality. The invention of the hook based fuse pulling handle is a much more robust system from that perspective.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING
Other features as well as the advantages of the invention will be clear from the following description.
In the appended drawing:
Figure i illustrates open orientation of the fuse pulling device.

Figure 2 illustrates functional orientation pulling device.
Figure 3 illustrates the fuse link.
Figure 4 illustrates the housing A with the shaft.
Figure 5 illustrates the functional orientation pulling device with fuse link.
DETAILED DESCRIPTION OF THE ACCOMPANYING DRAWING
In the following detailed description, reference is made to the accompanying drawings that form a part hereof, and illustrate the best mode presently contemplated for carrying out the invention. Further functioning of the device has been discussed below to describe the way the device operates. However, such description should not be considered as any limitation of scope of the present unit. The structure thus conceived is susceptible of numerous modifications and variations, all the details may furthermore be replaced with elements having technical equivalence. In practice the materials and dimensions may be any according to the requirements, which will still be comprised within its true spirit.
Constructional elements
1 Handle Grip
2 Groove A
3 Hook A
4 Housing A
5 Compression Spring
6 Housing B
7 Hook B

8 Housing Shaft
9 Adjustment knob

10 Groove B
11 Fuse knife
12 Fuse tag
Construction and Assembly:
Figure 1 discloses the fuse puller housing has two parts A(4) and B(6). Part A of the housing has a shaft (8) which is assembled inside a cylindrical slot inside the housing B (6) of the fuse puller. The far end of the shaft has threads on which an adjustable knob (9) is assembled. There is a compression spring (5) between the two housings. The system has a handle for grip (1) . There are two grooves (2and l0) , one on each housing in which a hook(3,7) each is assembled.
Figure I depicts the fuse puller in open orientation ready for use. Figure 2 depicts the fuse puller in functional orientation with the hooks toggled 90 degrees.
Figure 3 discloses the fuse link. The fuse link is having the fuse tag (12) and the fuse knife (11). The fuse puller is adapted to pull the fuse link of different sizes effectively.
Figure 4 discloses the housing A (4) with the housing shaft (8). The housing shaft originates from the housing A (4) and the shaft (8) is assembled inside a cylindrical slot inside the housing B (6) of the fuse puller.
Figure 5 discloses the fuse puller in functional orientation with the fuse link. The fuse puller in functional orientation with the hooks toggled 90 degrees to pull the fuse link of different sizes.

Working:
The adjustable knob (9) is tightened/ loosened to adjust the length of the fuse pulling handle. This is aided with the help of the compression spring (5) between the two housings (4 and 6). The compression spring (5) applies continuous tension pressing the two housing(4and6) away from each other. Thus the adjustable knob (9) tightening achieves a reduction in length working against the compression spring (5) force. The reverse operation achieves an increase in length.
As depicted in figure 1 the hooks (3and7) are assembled in the grooves (2andl0) available in the housing at 180 degrees to each other. This open orientation makes it feasible for the hook to reach the fuse knife of the fuse link for fuse link dismantling operation.
The hooks (3and7) are toggled as depicted in Figure 2 to complement each other forming a cage type lock for the fuse link gripping the fuse knife. Once the fuse knife is suitably gripped the handle grip (1) is used to pull the fuse link out of the fuse holders in the switch disconnector fuse, thus completing the fuse pulling operation.

WE CLAIM
1. An improved fuse pulling device adapted for pulling the fuses/fuse links from
the fuse tags/fuse holders, said device comprising :
a pair of modules, wherein each of said modules comprising :
(i) a first means and a second means substantially adjacent to each other,
said second means having a slot means substantially molded on outer
end of said second means ; (ii) a shaft means operatively associated with said first means and
assembled inside said slot means, said shaft means substantially
originating from said first means , wherein said shaft means
comprising substantially threaded protrusion means protruding from
said slot means; (iii) a pair of grooves ,said each groove is molded inside said each module,
wherein said pair of grooves are substantially transversal to each other; (iv) an energy storing means operatively positioned in-between said first
and second module; (v) a handle means substantially secured between said first means and
second means; (vi) a knob means assembled within said thread means adapted to adjust
length of said handle means; (vii) a pair of curved means substantially having hook like modular
structure , said each curved means is substantially accommodated
inside each groove;

such that said pair of curved means are substantially toggled 90 ° to complement each other forming a substantially cage type lock adapted for gripping the fuse /fuse links.
2. Device as claimed in claim 1 wherein said slot means is cylindrical.
3. Device as claimed in claim 1 wherein said energy storing means comprising compression spring and the like.
4. Device as claimed in claim 3 wherein said spring adapted to provide continuous tension to drive said pair of modules away from each other .
5. Device as claimed in claim 1 wherein said knob means is operatively connected with said handle adapted to adjust the length of the handle.
6. Device as claimed in claim 5 wherein said knob means is either tightened or loosened to decrease or increase the length of said handle means.
7. Device as claimed in claim 1 wherein said pair of curved means is toggled substantially 180 ° adapted to reach fuse knife of the fuse link for fuse link dismantling operation.
8. Device as claimed in claim 1 wherein said handle means having adjustable length adapted to fit fuse links/fuse of different size and pull the fuse link out of the fuse holder

9. An improved fuse pulling device adapted for pulling the fuses/fuse links from
the fuse tags/fuse holders as herein substantially described and illustrated with the accompanying drawings.