FORM 2
The Patents Act, 1970
(39 of 1970)
As amended by the Patents (Amendment) Act, 2005
&
The Patents Rules, 2003
As amended by the Patents (Amendment) Rules, 2006
Complete specification (See section 10 and rule 13)
TITLE OF INVENTION
A mechanical device for handling the porcelain insulator of an electrical equipment
INVENTORS
Deshpande Jayant Anant and Gadekar Sunil Rangnath, both Indian nationals and both of Engineering Department, Swtichgear Division, Crompton Greaves Limtied, A3 MIDC, Ambad, Nashik 422 010, Maharashtra, India
APPLICANTS
Name : Crompton Greaves Limited
Nationality : Indian Company
Address : CG House, Dr Annie Besant Road, Worli Mumbai 400025, Maharashtra, India
PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the nature of this invention and the manner in which it is to be performed:

FIELD OF INVENTION
This invention relates to a mechanical device for handling the porcelain insulator of an electrical equipment.
BACKGROUND OF INVENTION
Porcelain insulators of electrical equipments such as circuit breakers or surge arresters are handled manually that is to say that the insulators are lifted and placed in position manually, for instance, for assembling with the other components of the electrical equipments. Manual handling of the insulators is labour intensive, inconvenient and time consuming. It also causes fatigue to the labourers and increases cost in terms of labour. It also reduces productivity besides increasing chances of damage to the insulators during handling, for instance, due to loss of proper grip.
OBJECTS OF INVENTION
An object of the invention is to provide a mechanical device for handling the porcelain insulator of an electrical equipment, which device is simple in construction and easy to operate and does not require electrical energy for its operation.
Another object of the invention is to provide a mechanical device for handling the porcelain insulator of an electrical equipment, which device reduces labour, handling cost and time and fatigue to labourers and increases productivity.
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Another object of the invention is to provide a mechanical device for handling the porcelain insulator of an electrical equipment, which device is user friendly and prevents damage to the insulators.
DETAILED DESCRIPTION OF INVENTION
According to the invention there is provided a mechanical device for handling the porcelain insulator of an electrical equipment, the device comprising a beam provided with holding means at the center thereof and a pair of arms each at each end thereof, the upper ends of the arms being held in the beam with the arms being movable sideways about the beam, the upper end of each of the arms being provided with grip means and the lower end of each of the arms being provided with clasping means.
The following is a detailed description of the invention with reference to the accompanying drawings, in which:
Figs 1, 2 and 3 are schematic front view, side view and plain view respectively of the mechanical device for handling the porcelain insulator of an electrical equipment according to an embodiment of the invention with the arms moved down.
Figs 4 and 5 are schematic isometric views of the beam and one arm of the device of Fig 1, respectively;
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Fig 6 is front view of the device of Fig 1 with the arms moved sideways outwardly; and
Fig 7 is front view of the device of Fig 1 with the arms engaged over and gripping a porcelain insulator.
The device 1 as illustrated in Figs 1 to 7 of the accompanying drawings comprises a beam 2 of double walled construction comprising walls 3 and 4 in a spaced apart relationship with the web portion 5 between the walls (fig 4). 6 is a hook provided at the centre of the beam with its base marked 6a fixed onto the web portion 5. 7, 7 are a pair of arms each provided with pivot pins 8 protruding out from the opposite sides at the upper end thereof. The beam is provided with a pair of identical L - shaped slots 9, 9 each in each wall of the beam at each end thereof. The arms are located each at each end of the beam with the upper end of each of the arms positioned in the space between the walls of the beam and the pivot pins engaged in the respective pair of L-shaped slots at each end of the beam. The arms are provided with handles 10 each at the upper end of each of the arms. The arms are further provided with inwardly extending lateral projections 11 each at the lower end of each of the arms. The outer end of each of the lateral projections is curved (Figs 3 and 5) to correspond to the outer surface of the porcelain insulator 12 to be handled by the device of the invention. In order to lift the porcelain insulator the arms are held by the handles and lifted and moved sideways outwardly. The pivot pins slide up in the vertical portions of the L-shaped slots and slide out in the horizontal portions of the L-shaped slots so as to facilitate up and sideways movements of the arms. The device is positioned above the porcelain insulator and the arms are moved in and down
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and the lateral projections at the lower ends of the arms are engaged against the upper flange 13 of the porcelain insulator and the curved outer ends of the lateral projections are engaged over the outer surface of the porcelain insulator. The pivot pins at the upper ends of the arms slide inwardly in the horizontal portions and slide down in the vertical portions of the L-shaped slots at the ends of the beam to facilitate inward and downward movement of the arms. The hook at the center of the beam is engaged in the load lifting hook or loop (not shown) of a crane (not shown) and the porcelain insulator is lifted and lowered as desired by operating the crane. After the handling of the porcelain insulator, the device is disengaged from the porcelain insulator by moving the arms out sideways and lifting the arms away from the porcelain insulator by lifting and moving sideways the pivot pins in the L-shaped slots. The curved outer profile of the lateral projections ensures proper engagement of the lateral projections over the porcelain insulator. The vertical portions of the L-shaped slots are sufficiently long to ensure that the pivot pins do not slip out of them and the porcelain insulator is held in place positively during handling thereof.
The device of the invention is very simple in construction and easy to operate. It does not require electrical energy for its operation. The porcelain insulator can be easily and conveniently handled by the device of the invention. The device of the invention reduces labour, handling cost and time. It also reduces fatigue to labourers and increases productivity. It is very user friendly and prevents damage to the porcelain insulator during handling, for instance, due to loss of proper grip.
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The arms can be held in the beam differently to facilitate up and down and in and out movements of the arms. The configuration of the L-shaped slots can vary so as to facilitate up and down and in and out movements of the arms. The beam and arms configuration and construction can vary. The configuration of the handles at the up ends of the arms can vary. Instead of hook at the center of the beam, a loop or some other grip can be provided. The lower ends of the arms can be configured differently to hold the porcelain insulator. The device of the invention can also be used for handling any other load with appropriate modifications in the lower ends of the arms. Such variations in the construction and configuration of the device of the invention are to be construed and understood to be within the scope of the invention.
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We claim
1. A mechanical device for handling the porcelain insulator of an electrical equipment, the device comprising a beam provided with holding means at the center thereof and a pair of arms each at each end thereof, the upper ends of the arms being held in the beam with the arms being movable sideways about the beam, the upper end of each of the arms being provided with grip means and the lower end of each of the arms being provided with clasping means.
2. A mechanical device as claimed in claim 1, wherein the beam is double walled, the holding means comprises a hook provided at the center of the beam, the upper end of each of the arms is pivotally freely held in a pair of opposing identical L-shaped slots each provided in each wall of the beam at each end thereof, the grip means comprises a handle provided at the upper end of each of the arms and the clasping means comprises an inwardly extending lateral projection at the lower end of each of the arms.
3. A mechanical device as claimed in claim 2, wherein the outer end of the lateral projection is curved to correspond to the outer surface of the porcelain insulator.
Dated this 14th day of February 2007.

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Abstract
A mechanical device (1) for handling the porcelain insulator (12) of an electrical equipment. The device comprises a beam (2) provided with holding means (6) at the center thereof and a pair of arms (7,7) each at each end thereof. The upper ends of the arms are held in the beam with the arms being movable sideways about the beam. The upper end of each of the arms is provided with grip means (10) and the lower end of each of the arms is provided with clasping means (11) (Fig 1).