Description:
The present invention relates to a Self-Locking Latch Pin with Bezel and Handle-Bezel, Handle-Cam Latch Pin Assembly with inbuilt Poka-yoke.

BACKGROUND OF THE INVENTION
A relay is an electrical switch with electromagnet or solid-state devices along with required logic inbuilt to operate the main switch for an intended function. In protective relay, relay device designed to trip a circuit breaker when it detects an abnormal operating condition such as over-current, over-voltage, reverse power flow, over-frequency, and under-frequency fault is detected.

The feeder protection relays are widely used at the feeder levels in electrical circuit for monitoring the effective functioning of feeder. For making Feeder protection relay maintenance supportive draw-out type is made. Handle is used to draw-in and draw-out the relay during operation.

The US10047526B2 discloses about a mechanism which has a pin and a spring. It permits longitudinal movement of the pin back and forth within the void.

The technical problem exists with the available design is need to make reliable design with minimal components and error free assembly that is the key element for robust design methodology. Further, current products do not use self-locking concept on components and poka-yoke features.

Hence there is a need for a device to be developed which is free from the above-mentioned issues.

OBJECT OF THE INVENTION
It is an object of the present invention to overcome the shortcomings of the prior art.

It is an object of the present invention to provide a self-locking Latch pin with Bezel and Poka-yoke for assembling Handle with Bezel and Cam Latch pin is developed to make a reliable, error free and cost competitive product.

It is an object of the present invention to provide an in-built Poka-yoke for following assemblies to make error free assembly during production
a. Assembling Handle (2) into Bezel
b. Assembling Latch pin into Handle

SUMMARY OF THE INVENTION
The following disclosure presents a simplified summary of the invention in order to provide a basic understanding of some aspects of the invention. This summary is not an extensive overview of the present invention. It is not intended to identify the key/critical elements of the invention or to delineate the scope of the invention. Its sole purpose is to present some concept of the invention in a simplified form as a prelude to a more detailed description of the invention presented later.

In one aspect of the present invention there is provided a method of Self-Locking Latch pin in an electronic device, comprising the steps of:
inserting the Cam Latch pin assembly into the Bezel (1);
inserting a handle (2) inside the said bezel (1);
rotating the Cam latch pin assembly 90-degree anticlockwise direction;
wherein inserting the Cam Latch Pin assembly (5) into the Bezel cutout in such a manner that the 90-degree groove cut on the Cam Latch Pin assembly (5) is aligned itself with the 90-degree cut on the Bezel (1) barrier wall and push it inside; and
wherein rotating the pin assembly 90-degree anticlockwise direction lock the said pin assembly inside the barrier wall of the Bezel (1) On rotation.

In one aspect of the present invention there is provided a cam Latch Pin assembly; said assembly comprising
a Cam Latch Pin having a 90-degree groove cut;
a Bezel (1) with a Bezel cutout and a barrier wall having a 90-degree cut;
a handle (2), inserted inside the said bezel (1);
wherein, in a first step of assembly, the Cam Latch Pin assembly is inserted into the Bezel (1) cutout, aligning the 90-degree groove cut on the Cam Latch Pin assembly with the 90-degree cut on the Bezel barrier wall; and
in a second step of assembly, the Cam Latch Pin assembly is rotated 90 degrees anticlockwise, locking itself inside the barrier wall of the Bezel (1), thereby preventing movement or falling during operation.

In one aspect of the present invention there is provided a method of Self-Locking Latch pin in which in-built Poka-yoke for following assemblies (a) Assembling Handle into Bezel (1), (b) Assembling Latch pin into Handle is used to make error free assembly during production.

Other aspects, advantages, and salient features of the invention will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses exemplary embodiments of the invention.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
The above and other aspects, features and advantages of the embodiments of the present disclosure will be more apparent in the following description taken in conjunction with the accompanying drawings, in which:

Figure 1 illustrates shows the isometric, Front and Back view of the latch pin.
Figure 2 illustrates the Isometric view of Handle which forms the mating part with Bezel and Latch pin as shown above.
Figure 3 illustrates shows the assembly of Handle with Bezel.
Figure 4 illustrates the side view of Bezel and Handle.
Figure 5 illustrates the Isometric view of two different Cam Latch Pin assemblies which gets inserted in to the left and right side of the Bezel slot and gets locked with both sides of the Bezel & Handle.
Figure 6 illustrates the Bezel is also provided with similar 90-degree cut on the barrier wall.
Figure 7 illustrates the orientation of the Cam Latch Pin assembly when inserted and pushed.
Figure 8 illustrates the inserted Latch pin (without the Cam Latch for better clarity). This is the first step of the required assembly.
Figure 9 illustrates the second poka-yoke built between Cam Latch Pin assembly and Handle.
Figure 10 illustrates the exploded view of the assembly with all its components.
Figure 11 illustrates the locking of Handle with Bezel and Latch Pin with the help of Hexalobular screw
Figure 12 illustrates the the operating range of the Handle with Cam Latch Pin assembly.

Persons skilled in the art will appreciate that elements in the figures are illustrated for simplicity and clarity and may not have been drawn to scale. For example, the dimensions of some of the elements in the figure may be exaggerated relative to other elements to help to improve understanding of various exemplary embodiments of the present disclosure. Throughout the drawings, it should be noted that like reference numbers are used to depict the same or similar elements, features, and structures.

DETAILED DESCRIPTION OF THE PRESENT INVENTION
The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of various embodiments of the present disclosure as defined by the claims and their equivalents. It includes various specific details to assist in that understanding, but these are to be regarded as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the various embodiments described herein can be made without departing from the scope and spirit of the present disclosure. In addition, descriptions of well-known functions and constructions may be omitted for clarity and conciseness.

All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments belong. Further, the meaning of terms or words used in the specification and the claims should not be limited to the literal or commonly employed sense but should be construed in accordance with the spirit of the disclosure to most properly describe the present disclosure.

The terminology used herein is for the purpose of describing particular various embodiments only and is not intended to be limiting of various embodiments. As used herein, the singular forms "a," "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising" used herein specify the presence of stated features, integers, steps, operations, members, components, and/or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, members, components, and/or groups thereof.

The present disclosure will now be described more fully with reference to the accompanying drawings, in which various embodiments of the present disclosure are shown.

In one embodiment present invention describes about converting vertical motion into horizontal motion and through which indicating the status of the relay.

In one embodiment present invention describes a method of Self-Locking Latch pin in an electronic device, comprising the steps of: inserting the pin assembly into the Bezel (1); rotating the pin assembly 90-degree anticlockwise direction; wherein inserting the Cam Latch Pin assembly (5) into the Bezel cutout in such a manner that the 90-degree groove cut on the Cam Latch Pin assembly (5) is aligned itself with the 90-degree cut on the Bezel (1) barrier wall and push it inside; and wherein rotating the pin assembly 90-degree anticlockwise direction lock the said pin assembly inside the barrier wall of the Bezel (1) On rotation,

According to one implementation of the present invention, it relates to self-locking of Latch Pin with Bezel (1) by making innovative feature in Latch Pin & Bezel component to avoid/skip additional component and thus reducing product cost. In-built Poka-yoke for following assemblies to make error free assembly during production:
a. Assembling Handle into Bezel (1)
b. Assembling Latch pin into Handle

The construction described herein can be modified accordingly to suit a variety of applications and the construction shown below does not limit its application to the above system alone.

According to one implementation of the present invention, Image 1 depicts the isometric, Front and Back view of the latch pin which forms one part of the self-locking with Bezel (1) and second part of the poka-yoke assembly with Handle (2) under discussion. The above image also shows the features/profile in this pin which are helpful in achieving the desired intent. The Image 2 depicts the Isometric view of Handle (2) which forms the mating part with Bezel and Latch pin as shown above.

According to one implementation of the present invention, Image 3 depicts the assembly of Handle with Bezel (1). Image 4 depicts the side view of Bezel and Handle (2) which explains the poka-yoke feature built onto the Bezel (1) and Handle to prevent wrong assembly of Handle (2) into Bezel. This is achieved by using the diameter of the handle different at the intended two locations of fitment. The assembly requires that the circular portion of the handle (2) must be inserted inside the Bezel (1). As one is kept purposely larger than the other, the assembly happens only in the intended manner as depicted in the image i.e. Ø12 profile of Handle will enter into Ø12.4 profile of Bezel and Ø13 profile of Handle (2) will enter into Ø13.4 profile of Bezel (1). The reverse assembly is not possible.

According to one implementation of the present invention, Image 5 depicts the Isometric view of two different Cam Latch Pin assemblies which gets inserted in to the left and right side of the Bezel slot and gets locked with both sides of the Bezel (1) & Handle. The arrangement here discusses the unique Self-locking arrangement of the Latch pin with the Bezel and then with the Handle (2) ensuring that under all circumstances, there is only one way of integrating all of them together.

This is achieved by the following: The first step is to assemble the Cam Latch Pin assemblies into the Bezel (1). For this, reference of the Image 1 & Image 5 will be taken. The Latch Pin has a circular groove with 90-degree cut on it (Image 1 & 5). The Bezel is also provided with similar 90-degree cut on the barrier wall (Image 6). The Cam Latch pin assembly is trapped within Bezel (1) with the help of the groove. The Groove in Cam Latch Pin and the barrier wall in the Bezel helps to self-lock the Cam Latch (4) Pin with Bezel (1) and to restrict the movement during operation.

According to one implementation of the present invention, To fit the Cam Latch Pin assembly (5) with the Bezel, the following sequence is to be followed First, insert the Cam Latch Pin assembly (5) into the Bezel (1) cutout such that the 90-degree groove cut on the Cam Latch Pin assembly (5) is aligned itself with the 90-degree cut on the Bezel (1) barrier wall and push it inside (Image 7). The left side portion of Image 7 shows the orientation of the Cam Latch Pin assembly (5) when inserted and pushed. The right-side portion of Image 7 shows the inserted Latch pin (without the Cam Latch for better clarity). This is the first step of the required assembly.

According to one implementation of the present invention, the second step is to rotate the Cam Latch Pin assembly 90-degree anticlockwise so that it gets locked itself inside the barrier wall of the Bezel (1) (Image 8). On rotation, the Cam Latch Pin secures itself inside the Bezel (1) preventing it from moving/falling during operation. This is the starting position for the Handle (2) operating range. The left side portion of Image 8 below shows the orientation of the Cam Latch Pin assembly (5) when rotated and locked. The right-side portion of Image 8 shows the rotated Latch pin (without the Cam Latch (4) for better clarity).

According to one implementation of the present invention, Rotation of Cam Latch Pin from starting position to further 90-degrees will be the operating range of the Handle. Image 9 shows the total span of the operation of the Cam Latch Pin connected to Bezel (1) & Handle (2), performing its intended function and shows the Cam Latch Pin displaced to its fullest extent & its maximum operating range. The right-side portion of Image 9 shows the rotated Latch pin (without the Cam Latch (4) for better clarity)

According to one implementation of the present invention, Repeat the same steps for the right-side Cam Latch Pin assembly (5) as well.

According to one implementation of the present invention, Image 10 depicts the second poka-yoke built between Cam Latch Pin assembly (5) and Handle (2). The gear profile on the Latch Pin and Handle (2) is made such that it is matched only in its intended orientation and the other way is not possible. This is achieved by designing the gear tooth width differently (Image 10) so that corresponding fitment is done only in a unique intended manner and making the whole assembly mistake-proof. After locking the Cam Latch (4) pin into Handle the Cam latch can never be go back to the first step.

According to one implementation of the present invention, Image 11 depicts the locking of Handle (2) with Bezel (1) and Latch Pin with the help of Hexalobular screw (6) (Image 11). This special screw is used to avoid accessing of this screw by customer at site as special tool will be required to access the same.

According to one implementation of the present invention, Image 12 shows the operating range of the Handle (2) with Cam Latch Pin assembly (5). Left side image depicts the starting position of Handle (2) operation and Right-side image depicts the ending position of Handle operation. With the above, the Self-locking of Cam Latch Pin with Bezel (1) and poka-yoke for Handle-Bezel & Handle (2) Latch Pin is achieved.

TECHNICAL DESCRIPTION, DETAILS AND SUPPORTING DATA
Glossary:
Relay:
A relay is an electrical switch with electromagnet or solid-state devices along with required logic inbuilt to operate the main switch for an intended function.

Feeder protection relay:
The feeder protection relays are widely used at the feeder levels in electrical circuit for the monitoring the effective functioning of feeder

Bezel:
Bezel is used for holding and securing the PCB cards and acts as user interface for Display and navigation.

Handle:
Handle is used for operating the draw-out module for draw-in and draw-out operation.

Cam Latch Pin Assembly:
Cam Latch Pin assembly comprises of two components i.e. Latch Pin and Cam latch. Latch pin is used for locking Handle with Bezel. Cam Latch is used for driving the draw-out module into Fixed module.

Hexalobular Screw (6):
Handle Hexalobular screw is used for locking Handle with Latch Pin.

The invention here talks about an innovative way of achieving following functions:
1) Self-Locking Latch pin with Bezel to reduce assembly time, product cost and improve reliability of the product
2. Pola-yoke for following assemblies to make error free product to improve productivity
a. Assembling Handle (2) into Bezel
b. Assembling Latch pin into Handle

Purpose of the invention
 explains about the self-locking of latch Pin by using 90° cut profile on the pin.
 Ensures self-locking of Latch Pin with Bezel and avoids an additional component being used
 Reduces assembly time, product cost and improves product reliability
 Ensures error-free product assembly by providing in-built poka-yoke
 Avoids rework and thus reduces product cost
Following component is used to perform the present invention.

List of parts/components: Refer Images 1-7

1. Bezel
2. Handle
3. Latch Pin
4. Cam Latch
5. Cam Latch Pin Assembly
6. Hexalobular Screw

, Claims:
1. A method of Self-Locking Latch pin in an electronic device, comprising the steps of:
inserting the Cam Latch pin assembly into the Bezel (1);
inserting a handle (2) inside the said bezel (1);
rotating the Cam latch pin assembly 90-degree anticlockwise direction;
wherein inserting the Cam Latch Pin assembly (5) into the Bezel cutout in such a manner that the 90-degree groove cut on the Cam Latch Pin assembly (5) is aligned itself with the 90-degree cut on the Bezel (1) barrier wall and push it inside; and
wherein rotating the pin assembly 90-degree anticlockwise direction lock the said pin assembly inside the barrier wall of the Bezel (1) On rotation.

2. The method of claim 1, wherein upon lock, the Cam Latch Pin (4) secures itself inside the Bezel (1) preventing it from moving/falling during operation.

3. The method of claim 1, wherein in-built Poka-yoke for following assemblies (a) Assembling Handle into Bezel (1), (b) Assembling Latch pin into Handle is used to make error free assembly during production.

4. A cam Latch Pin assembly; said assembly comprising
a Cam Latch Pin having a 90-degree groove cut;
a Bezel (1) with a Bezel cutout and a barrier wall having a 90-degree cut;
a handle (2), inserted inside the said bezel (1);
wherein, in a first step of assembly, the Cam Latch Pin assembly is inserted into the Bezel (1) cutout, aligning the 90-degree groove cut on the Cam Latch Pin assembly with the 90-degree cut on the Bezel barrier wall; and
in a second step of assembly, the Cam Latch Pin assembly is rotated 90 degrees anticlockwise, locking itself inside the barrier wall of the Bezel (1), thereby preventing movement or falling during operation;

5. The Cam Latch Pin assembly of claim 4, wherein the rotated Cam Latch Pin assembly in the second step serves as the starting position for the Handle operating range.

6. The Cam Latch Pin assembly of claim 4, wherein the 90-degree groove cut on the Cam Latch Pin assembly cooperates with the 90-degree cut on the Bezel barrier wall to establish a secure connection.

7. The Cam Latch Pin assembly of claim 4, wherein the rotation of the Cam Latch Pin assembly in the second step is configured to prevent movement.

8. The Cam Latch Pin assembly of claim 4, wherein in-built Poka-yoke for following assemblies (a) Assembling Handle into Bezel (1), (b) Assembling Latch pin into Handle is used to make error free assembly during production.