FORM 2
THE PATENT ACT 1970
&
The Patents Rules, 2003
COMPLETE SPECIFICATION (See section 10 and rule 13)
1. TITLE OF THE INVENTION:
Assembly for Mounting/Unmounting Circuit Breaker on/from DIN Rail
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,
L&T House, Ballard Estate, P. 0. Box: 278, Mumbai 400 001, India
3. PREAMBLE TO THE DESCRIPTION:
COMPLETE
The following specification particularly describes the invention and the manner in which it is to be performed.

Assembly for Mounting/Unmounting Circuit Breaker on/from DIN Rail
Field of the invention
The present invention relates generally to mounting/unmounting of circuit breakers, and more particularly to mounting/unmounting of the circuit breakers on DIN rail used in electrical and switchgear industries.
Background of the invention
A circuit breaker needs to be mounted on a DIN rail for the purpose of any electrical installation and for this the circuit breaker needs to be locked with the DIN rail firmly. To achieve this, some kind of positive locking of the circuit breaker with the DIN rait is required. Generally, a DIN clip or an adaptor is used for locking and unlocking of the circuit breaker from the DIN rail.
In case of a single pole circuit breaker, the circuit breaker can be locked to the DIN rail by pushing a clip towards the DIN rail. Similarly, for unlocking the circuit breaker from the DIN rail, the clip has to be pulled. In order that the circuit breaker locks firmly with the DIN rail, the circuit breaker is pushed with a force and this is generally achieved by a spring in current technologies.
In some other types of locking mechanism of the circuit breaker to the DIN rail, a flexible metal string strip or pin is used. The flexible metal string strip or pin is supported on two sides of the DIN clip and is engaged with the DIN clip. When the DIN clip is pulled down by means of a tool or hand, the metal string or strip gets bent. The metal string or strip being flexible works as a spring and thus a DIN clip gets pulled down. Now when the circuit breaker is positioned on the DIN rail, the pressure applied on the clip by tool or hand releases and the DIN clip regains its original position. This is because of spring properties of the metal string/strip. Thus, the clip gets locked with the rail and circuit breaker gets mounted on the DIN rail. To unmount the circuit breaker for the DIN rail, reverse procedure is followed.

However, with the flexible string or strip being used, the flexible string or strip requires them to be supported on both sides of the clip and hence length of the string or strip required is more than the clip. This also requires the creation of means on both sides of the DIN clip, thus adding to tooling costs.
Accordingly, there exists a need to provide assembly for mounting/unmounting of the circuit breaker from the DIN Rail, which overcomes above-mentioned drawbacks.
Objects of the invention
An object of the present invention is to reduce requirement of additional support for mounting/unmounting a circuit breaker on/from a DIN rail.
Summary of the invention
Accordingly, the present invention provides an assembly for mounting/ unmounting a circuit breaker on/from a DIN rail. The assembly comprises a DIN clip being capable of sliding between and in parallel to two walls of a housing of the circuit breaker. Further, the assembly includes a protrusion configured on the housing in between the two walls of the housing. Furthermore, the assembly includes a string having its ends confined at two sides of the DIN clip. The string keeps the DIN clip and the circuit breaker in mounted position while restrained horizontally against the protrusion.
Wherein, when the DIN clip is forced to move away from the DIN rail, the string is elastically bent with its middle portion staying pressed against the protrusion and its ends moving along with the DIN clip and facilitating the latter to slide away and get unmounted, and upon removal of the force, the string straightens up returning to its original position and mounting the DIN clip back on the DIN rail.
Brief description of the drawings

Figure 1 show an assembly for mounting/unmounting a circuit breakers on/from a DIN rail, in locked condition, in accordance with the present invention;
Figure 2 shows the assembly for mounting/unmounting a circuit breakers on/from a DIN rail, in unlocked condition, in accordance with the present invention;
Figure 3 shows a front view of the assembly of figure 2 in unlocked condition; and
Figure 4 shows a side view of assembly of figure 1 in locked condition.
Detailed description of the invention
The foregoing objects of the present 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 embodiments.
Referring to figure 1-4, there are shown various views of an assembly (100) for mounting/unmounting a circuit breaker (150) on/from a DIN rail (200). The assembly (100) includes a DIN clip (10), a protrusion (20), and string (30).
The DIN clip (10) is a clip known in the art used to mount the circuit breaker (150) on the DIN rail (200). The DIN clip (10) is capable of sliding between and in parallel to two walls (152a, 152b) of a housing (152) of the circuit breaker (150). The DIN clip (10) includes a slot (12) provided thereon for inserting a tool for pulling the DIN clip (10) from the housing (152).
The housing (152) includes the protrusion (20) configured thereon. The protrusion (20) is configured on wall of the housing (152) such that the protrusion lies in between the two walls (152a, 152b) of the housing (152). In an embodiment, the protrusion is made of PVC grade plastic material. The protrusion (20) is configured on the housing (152) such that the protrusion (20) supports the string (30) thereon.

The string (30) includes ends thereof confined between at two sides of the din clip (10). The string (30) keeps the din clip (10) and the circuit breaker (200) in mounted position while restrained horizontally against the protrusion (20). In an embodiment, the string (30) is flexible metal string. In another embodiment, the string (30) is flexible metal strip. Specifically, the string (30) rests on the protrusion (20) thereby keeping the DIN clip (10) at firm position without moving the DIN clip (10) downwards. In an embodiment, the string (30) is supported on two sides of the DIN clip (10) by providing holes in limbs of the DIN clip (10). Accordingly, no additional supports are required to be made on housing as used in previous technologies.
When the din clip (10) is forced to move away from the DIN rail (200), the string (30) is elastically bent with its middle portion staying pressed against the protrusion (20). The ends of the string (30) moves along with the din clip (10) and facilitate the DIN clip (10) to slide away and get unmounted. Upon removal of the force, the string (30) straightens up returning to its original position and mounting the DIN clip (10) back on the DIN rail (200).
Referring to figure 1. there is shown a locked condition of the assembly (100) when the DIN clip (10) is in normal position. In normal position, the DIN clip (10) stays engaged to the DIN rail (200) thereby keeping the circuit breaker (150) mounted on the DIN rail (200). The string (30) rests on protrusion (20) thereby keeping the DIN clip (10) at firm position without moving the DIN clip (10) downwards, unless pull force is applied with the help of tool engaged in the slot (12).
Referring to figure 2, there is shown an unlocked condition of the assembly (100) when the DIN clip (10) is in pulled position. Using a tool such as a screw driver, which is engaged with the slot (12), the DIN clip (10) is pulled in downward direction. In figure 2, the direction of the DIN clip (10) movement is shown by thick arrow. When the DIN clip (10) is pulled down, the DIN clip (10) slides between the two walls (152a, 152b) of the housing (152). As the string (30) also moves with the DIN clip (10), the motion of the string (30) is hindered by the protrusion (20) provided on housing (152). Being flexible in nature, the string (30) bends with application of force in direction of thick

arrow, as shown in the figure 2. Jn this position, the DIN clip (10) is pulled down, and the housing (152) can be removed from the DIN rail (200). Thus the circuit breaker (150) can be unmounted by pulling the DIN clip (10) downwards.
Specifically, figure 3 shows a front view of DIN clip (10) when the DIN clip (10) is being pulled in direction shown by thick arrow, and figure 4 shows a side view of locked condition of the assembly (100) when no force applied on the DIN clip (10).
Advantage of the invention
The mounting and unmounting of the circuit breaker using the assembly (100) from the DIN rail requires shorter length of flexible string and minimal means for supporting the string on the housing (152) as opposed to prior art technologies, which also saves on material and tooling costs.
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. An assembly for mounting/unmounting a circuit breaker on/from a DIN
rail, the assembly comprising:
a DIN clip (10) being capable of sliding between and in parallel to two walls (152a, 152b) of a housing (152) of the circuit breaker (150);
a protrusion (20) configured on the housing (152) in between the two walls (152a, 152b) of the housing (150); and
a string (30) having its ends confined at two sides of the DIN clip (10), the string (30) keeping the DIN clip (10) and the circuit breaker (150) in mounted position while restrained horizontally against the protrusion (20),
wherein, when the DIN clip (10) is forced to move away from the DIN rail (200), the string (30) is elastically bent with its middle portion staying pressed against the protrusion (20) and its ends moving along with the DIN clip (10) and facilitating the latter to slide away and get unmounted, and upon removal of the force, the string (30) straightens up returning to its original position and mounting the DIN clip (10) back on the DIN rail (200).
2. The assembly as claimed in claim 1, wherein the DIN clip (10) has a slot (12) provided thereon for accommodating a tool for applying the force.
3. The assembly as claimed in claim 1, wherein the string (30) is flexible metal string.