FORM 2
THE PATENT ACT 1970
&
The Patents Rules, 2003
COMPLETE SPECIFICATION
(See section 10 and rule 13)
1. TITLE OF THE INVENTION:
"Screw Less Assembly of Auxiliary BusBar in Switchboards"
2. APPLICANT:
(a) NAME: Larsen & Toubro Limited
(b) NATIONALITY: Indian Company registered under the
provisions of the Companies Act-1956.
(c) ADDRESS: Larsen & Toubro Limited
Electrical & Automation North Wing, Gate 7, Level 0, Powai Campus, Saki Vihar Road, Mumbai 400 072, INDIA
3. PREAMBLE TO THE DESCRIPTION:
COMPLETE
The following specification particularly describes the invention and the manner in which it is to be performed.

Screw Less Assembly of Auxiliary Bus Bar in Switchboards
Field of the invention
The present invention relates to assembly of auxiliary busbar in switchboards, and more particularly, to a screw less assembly of auxiliary bus bars which can be directly connected in switchboards using a click fit mechanism.
Background of the invention
Existing auxiliary bus bars used in switchboards require more space because conducting and insulating parts used therein are bigger in size. Further, supports on which the auxiliary bus bars are provided includes terminals for taking out the lugs, which increases the space required. Furthermore, if more number of terminals are required, the number of supports has to be increased thereby increasing the size thereof.
Generally, the assembly of the auxiliary bus bars has to be done directly on the switchboard, which increases the assembly time. Further, the number of components used during the assembly of the auxiliary bus bars is also high. Furthermore, the auxiliary bus bars used are not shrouded and the utilization of the space by the bars is also high.
Accordingly, there is exist a need to provide assembling of auxiliary bus bars, which overcomes the drawbacks mentioned in the prior art.
Objects of the invention
An object of the present invention is to provide a mechanism for assembly of auxiliary bus bars on the switchboard, which require less space.

Another object of the present invention is to provide a mechanism for assembly of auxiliary bus bars on the switchboard without use of any hardware.
Summary of the invention
The present invention provides a mechanism for providing screwless assembly of auxiliary bus bars in switchboard, the mechanism comprising:
a plurality of auxiliary bus bars having detachably secured tap-offs provided throughout the length thereof for push fit lugs;
an housing having a plurality of slots to accommodate the plurality of auxiliary bus bars therein, wherein the housing shrouds the plurality of auxiliary bus bars;
a plurality of clamps disposed on the housing for supporting the plurality of auxiliary bus bars thereby detachably attaching the bus bars with the housing; and
a base plate removably affixing the housing, the base plate having flange for attachment to the switchboard by press-fit mechanism, wherein the flange is capable of holding the housing without fastening.
Brief description of drawings
Figure 1 depicts a perspective view of a mechanism for screwless assembly of auxiliary bus bars in a switchboard, in accordance with the present invention;
Figure 2 depicts a side view of the screwless assembly of the mechanism of figure 1;
Figure 3 depicts a perspective view of an auxiliary bus bar of the mechanism of figure 1;
Figure 4 depicts a perspective view of an housing of the mechanism of figure 1;

Figure 5 depicts a perspective view of a clamp of the mechanism of figure l;and Figure 6 depicts a perspective view of abase plate of the mechanism of figure 1.
Detailed description of the present invention
The foregoing objects of the invention are accomplished and the problems and shortcomings associated with the prior art techniques and approaches are overcome by the present invention as described below in the preferred embodiment.
Accordingly, the present invention provides a mechanism of screwless assembly for auxiliary bus bars in a switchboard. The screwless assembly of the auxiliary bus bars in the switchboard requires less space. Further, the screwless assembly of auxiliary bus bars in the switchboard is achieved without use of hardware, thereby providing a simple and safe assembly. The screwless assembly of the auxiliary bus bars can be assembled outside the panel and can be easily fit inside the switchboard by click fit mechanism.
The present invention is illustrated with reference to the accompanying drawings, throughout which reference numbers indicate corresponding parts in the figure. These reference numbers are shown in bracket in the following description.
Referring now to figure 1 to 6, there is shown a mechanism for providing screwless assembly of auxiliary bus bars in a switchboard, in accordance with the present invention. The mechanism (100) includes a plurality of auxiliary bus bars (10), an housing (20) for shrouding the plurality of auxiliary bus bars (10),a plurality of clamps (30) disposed on the housing for supporting the plurality of

auxiliary bus bars (10) in the housing (20)and a base plate (40) capable of affixing the housing (20) thereon.
Figure 3shows the plurality auxiliary bus bars (10) (herein after 'bus bars (10)'). The bus bars (10)are required for supplying auxiliary supply to contactors, relays, switches, instrumentation transformers and the like inside the switchboard (not shown). The bus bars (10) are provided with detachably secured tap-offs(12)throughout the length thereof for push fit lugs. Specifically, the teeth like shape of the bus bars(10) help in easy connection of lugs. The tap off may be taken easily from the bus bar (10). Specifically, the number of tap-off depends on the width of the panel. For example, for a 800 width panel, more than 80 tap-off may be taken.
In an embodiment, the bus bars (10) are manufactured out of copper sheet or by extrusion. The cross section of the bus bar (10) depends on current rating thereof. The bus bars (10) placed inside the housing (20).
Figure 4shows the housing (20). The housing (20)shrouds the bus bars (10). The housing (20) includes a plurality of slots (22) to accommodate the bus bars (10) therein. The plurality of slots (12) may be used or left empty depending on the requirement of the bus bar (10) in the switch board.
In an embodiment, the housing (20) is an extruded profile made up of polyvinyl chloride, Grade REON 67-01.
The housing (20) runs through the width of the panel of the switch board and is fixed to the base plate (40) by a flexible rib (22) on the housing (20).
Figure 5 shows a plurality of clamps (30) (hereinafter the 'clamps (30)'). The clamps (30) disposed on the housing for supporting the bus bars (10) thereby detachably attaching the bus bars (10) with the housing. The clamps (30)

support the bus bars (10) in the housing (20) and keeps the bus bars (10) in position. In an embodiment, the clamps(30) are made of Polyamide 6 (Nylon 6) - FR grade, AKULON k225KS of DSM. Further, provisions are provided on the clamps (30) for numbering to identify the bus bars (10) secured therewith.
Further, figure 6 shows the base plate (40) on which the housing (20) is fixed. The base plate (40) includes a flange (42) projecting therefrom. The flange (42) helps to fix the mechanism by a click fit mechanism to the switchboard.
Advantages of the invention
1. The mechanism (100) provides ease of assembly of the auxiliary bus bars in the switchboard.
2. The mechanism (100) has compact design
3. The tap off can be taken easily from the auxiliary bus bars.
4. The mechanism (100) uses less number of components.
The foregoing descriptions of specific embodiments of the present invention have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the present invention to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the present invention and its practical application, to thereby enable others skilled in the art to best utilize the present invention and various embodiments with various modifications as are suited to the particular use contemplated. It is understood that various omission and substitutions of equivalents are contemplated as circumstance may suggest or render expedient, but such are intended to cover the application or implementation without departing from the spirit or scope of the present invention.

We Claim:
1, A mechanism for providing screwless assembly of auxiliary bus bars in
switchboard, the mechanism comprising:
a plurality of auxiliary bus bars having detachably secured tap-offs provided throughout the length thereof for push fit lugs;
an housing having a plurality of slots to accommodate the plurality of auxiliary bus bars therein, wherein the housing shrouds the plurality of auxiliary bus bars;
a plurality of clamps disposed on the housing for supporting the plurality of auxiliary bus bars thereby detachably attaching the bus bars with the housing; and
a base plate removably affixing the housing, the base plate having flange for attachment to the switchboard by press-fit mechanism, wherein the flange is capable of holding the housing without fastening.
2, The mechanism of claim 1, wherein the housing is fixed to the base plate by a flexible rib thereon.
3, The mechanism of claim 1, wherein the clamps are provided with numbering to identify the auxiliary bus bars.