DESC:FORM 2

THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENT RULES, 2003

COMPLETE SPECIFICATION
(See Section 10 and Rule 13)

Title of invention:
A FIXTURE FOR CUTTING A DUCT

Applicant:
Mazagon Dock Shipbuilders Limited
A company Incorporated in India under the Companies Act, 1956
Under Ministry of Defence,
(A Govt. of India Undertaking)
Having address:
Dockyard Road, Mazagon,
Mumbai - 400010, Maharashtra, India

The following specification particularly describes the invention and the manner in which it is to be performed.
CROSS-REFERENCE TO RELATED APPLICATIONS AND PRIORITY
[001] This patent application claims priority from Indian Provisional Application 201821042585 filed on November 13, 2018.
TECHNICAL FIELD
[002] The present subject matter described herein generally relates to a fixture for cutting a duct.
BACKGROUND
[003] Pre-insulated double spiral duct is available in pre-defined lengths specially 3 mt. length. The Pre-insulated double spiral duct pipes may be interchangeably referred to as a duct, hereinafter. For specific applications, the duct has to be cut according to length required for that specific application. Currently, the technique used to cut the duct during manufacturing is cutting a single pipe to a pre-defined length required by the application facilitated by a plasma cutting machine or by a cutting wheel. The single pipe may be cut after fabrication. After cutting of the single pipe, the single pipe is further fabricated into the pre-insulated double spiral duct. It is to be noted that if the cutting process were to be implemented on the pre-insulated double spiral duct after manufacturing, the pre-insulated double spiral duct has to be cut manually facilitated by a hacksaw. Further, challenges may arise during the manual cutting of the pre-insulated double spiral duct. One of the challenge during manual cutting of the pre-insulated double spiral duct is that an inner spiral duct that is a part of the pre-insulated double spiral duct does not have any support, resulting in slippage of the inner spiral duct during manual cutting, thereby resulting in unequal surface edge after cutting. The pre-insulated double spiral duct is fabricated with a cold rolled steel strips by a lock form method. Further, another challenge faced during manual cutting is that the cold rolled steel act as a deterrent due to its thickness, thereby increasing the cutting efforts. Further, the pre-insulated double spiral duct consists of Mineral Fiber Resin Board (MFRB) insulation between the inner spiral duct and an outer spiral duct. During manual cutting, the MFRB insulation particles are produced which spread in air causing itching on body parts.

SUMMARY
[004] Before the present apparatus is described, it is to be understood that this application is not limited to the particular machine or apparatus, as there can be multiple possible embodiments that are not expressly illustrated in the present disclosures. It is also to be understood that the terminology used in the description is for the purpose of describing the particular versions or embodiments only and is not intended to limit the scope of the present application. This summary is provided to introduce aspects related to a fixture for cutting a duct, and the aspects are further elaborated below in the detailed description. This summary is not intended to identify essential features of the proposed subject matter nor is it intended for use in determining or limiting the scope of the proposed subject matter.
[005] The present subject matter describes a fixture for cutting a duct. The fixture may comprise a table, wherein the table is capable to move along an x-axis. The fixture may further comprise a set of first clamps attached on the table, wherein the set of first clamps are capable to hold a duct. The fixture may further comprise a one or more gaskets, wherein the one or more gaskets are installed at an inner side of the duct and an outer pipe of the duct. The fixture may further comprise a set of second clamps affixed on a circumference of the duct at a predefined distance, wherein the set of second clamps are capable to hold the one or more gaskets and the duct together. The fixture may further comprise a rigid square bar is installed & act as guide for keyway on band saw machine for guiding the movement of the table along the x-axis, wherein the movement of the table having the duct facilitates cutting of the duct.
BRIEF DESCRIPTION OF THE DRAWINGS
[006] The foregoing summary, as well as the following detailed description of embodiments, is better understood when read in conjunction with the appended drawings. For the purpose of illustrating the disclosure, there is shown in the present document example constructions of the disclosure, however, the disclosure is not limited to the specific methods and apparatus disclosed in the document and the drawing.
[007] The detailed description is described with reference to the accompanying figures. In the figure, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The same numbers are used throughout the drawing to refer like features and components.
[008] Figure 1 represents various part of the fixture 100 for cutting a duct, in accordance with an embodiment of the present subject matter.
[009] Figure 2 illustrates a top view 200 of the fixture 100 for cutting a duct, in accordance with an embodiment of the present subject matter.
[0010] Figure 3 represents a keyway 302 connected to a bottom of the fixture 100, in accordance with an embodiment of the present subject matter.
[0011] The figure depicts various embodiments of the present disclosure for purposes of illustration only. One skilled in the art will readily recognize from the following discussion that alternative embodiments of the fixture for cutting a duct illustrated herein may be employed without departing from the principles of the disclosure described herein.
DETAILED DESCRIPTION
[0012] Some embodiments of this disclosure, illustrating all its features, will now be discussed in detail. The words "comprising", “having”, and "including," and other forms thereof, are intended to be equivalent in meaning and be open ended in that an item or items following any one of these words is not meant to be an exhaustive listing of such item or items, or meant to be limited to only the listed item or items. It must also be noted that as used herein and in the appended claims, the singular forms "a," "an," and "the" include plural references unless the context clearly dictates otherwise. Although any apparatuses and methods similar or equivalent to those described herein can be used in the practice or testing of embodiments of the present disclosure, the exemplary, apparatuses and methods are now described. The disclosed embodiments are merely exemplary of the disclosure, which may be embodied in various forms.
[0013] Various modifications to the embodiment will be readily apparent to those skilled in the art and the generic principles herein may be applied to other embodiments. However, one of ordinary skill in the art will readily recognize that the present disclosure is not intended to be limited to the embodiments illustrated but is to be accorded the widest scope consistent with the principles and features described herein.
[0014] As described above, a fixture for cutting a duct is disclosed. The fixture may comprise a table. The table may be capable to move along an x-axis. The fixture may further comprise a set of first clamps. The set of first clamps may be attached on the table and may be capable to hold the duct. The fixture may further comprise a one or more gaskets, wherein the one or more gaskets may be installed at an inner side of the duct and at an outer side of the duct to prevent misalignment. The fixture may further comprise a set if second clamps which may be affixed on a circumference of the duct at a predefined distance. The set of second clamps are capable to hold the one or more gaskets and the duct together. The fixture may further comprise a rigid square bar is installed & act as guide for keyway on band saw machine for guiding the movement of the table along the x-axis. Since the fixture is used for cutting the duct, the problems of infection or itching on the human body due to MFRB insulation particles are eliminated.
[0015] Hence, the fixture for cutting the duct is technically advanced. The pieces of the ducts that are obtained after cutting may have straight and uniform surface edges. Due to the use of the fixture for cutting the duct, the cutting time and cost is also significantly reduced. The fixture may facilitate smooth cutting. Further, due to the use of the fixture for cutting the duct, fatigue of the workman may be reduced, and breakage of the hacksaw blade may to eliminated.
[0016] Referring to figure 1, that represents various part of the fixture 100 for cutting a duct, in accordance with an embodiment of the present subject matter.
[0017] In one embodiment, the fixture 100 may comprise a table 102, a set of first clamps 106, one or more gaskets 104 and a set of second clamps 108. The table 102 may be capable to move along an x-axis. The table 102 may be modified by installing brass rollers. The brass rollers may be installed to facilitate smooth motion. Further, the set of first clamps 106 may be attached on the table 102. The set of first clamps 106 may be capable to hold the duct 110. The set of first clamps 106 may be fabricated to suit or receive different sizes of the duct 110.
[0018] Further, the one or more gaskets 104 may be installed at an inner side of the duct 110 and at an outer side of the duct 110. The one or more gaskets 104 may be made up of a material comprises a rubber, a steel, etc. The installation of the one or more gaskets 104 may prevent misalignment and movement of the duct 110 while cutting operation.
[0019] The set of second clamps 108 may be further affixed on a circumference of the duct 110 at a predefined distance. The set of second clamps 108 may be capable to firmly hold the one or more gaskets 104 and the duct 110 together.
[0020] In one embodiment, the fixture 100 may be mounted on an automated cutting machine and below a cutting tool. The automated cutting machine may comprise different type of machines such as but are not limited to a vertical band saw machine. The cutting tool may pass through the duct 110 due to the movement of the table 102 inorder to facilitate a cutting operation. The cutting tool may comprise a cutting blade having 24 Teeth per inch (TPI). The cutting blade having 24 Teeth per inch may be used to prevent twisting and wavering of the cutting blades.
[0021] Referring to figure 2, illustrates a top view 200 of the fixture 100 for cutting a duct, in accordance with an embodiment of the present subject matter.
[0022] The table 100 may comprise one or more handle 202 in order to facilitate movement of the table 102. Further, figure 2 represents top view of the table 102 and the set of first clamps 106.
[0023] Referring to figure 3, represents a guide for keyway 302 connected to a bottom of the fixture 100, in accordance with an embodiment of the present subject matter. The guide for keyway 302 may guide the movement of the table 102 along the x-axis. The movement of the table 102 having the duct 110 may facilitate cutting of the duct 110. Further, figure 3 represents partial side view of the set of first clamps 106.
[0024] Exemplary embodiments discussed above may provide certain advantages. Though not required to practice aspects of the disclosure, these advantages may include those provided by the following features.
[0025] Some embodiment of the fixture 100 for cutting the duct 110 reduces the problems of infection or itching on the human body due to MFRB insulation particles.
[0026] Some embodiment of the fixture 100 for cutting the duct 110 provides straight and uniform surface edges of the duct 110 after cutting.
[0027] Some embodiment of the fixture 100 for cutting the duct 110 significantly reduces the cutting time and cost and facilitate smooth cutting.
[0028] Some embodiment of the fixture 100 for cutting the duct 110 reduces fatigue of the workman and eliminates breakage of the hacksaw blade.
[0029] Although implementations for the fixture 100 have been described in language specific to structural features and/or methods, it is to be understood that the appended claims are not necessarily limited to the specific features described. Rather, the specific features are disclosed as examples of implementation for the fixture 100.
,CLAIMS:1. A fixture (100) for cutting a duct (110), the fixture (100) comprising:
a table (102), wherein the table (102) is capable to move along an x-axis;
a set of first clamps (106) attached on the table (102), wherein the set of first clamps (106) are capable to hold a duct (110);
a one or more gaskets (104), wherein the one or more gaskets (104) are installed at an inner side of the duct (110) and at an outer side of the duct (110); and
a set of second clamps (108) affixed on a circumference of the duct (110) at a predefined distance, wherein the set of second clamps (108) are capable to hold the one or more gaskets (104) and the duct (110) together; and
a guide for keyway (302) for guiding the movement of the table (102) along the x-axis, wherein the movement of the table (102) having the duct (110) facilitates cutting of the duct (110).

2. The fixture (100) of claim 1, wherein the fixture (100) is mounted on an automated cutting machine and below a cutting tool.

3. The fixture (100) of claim 2, wherein the cutting tool passes through the duct (110) due to the movement of the table (102) thereby facilitate a cutting operation.

4. The fixture (100) of claim 2, wherein the cutting tool comprise at least a cutting blade having 24 TPI (Teeth per inch).

5. The fixture (100) of claim 2, wherein the automatic cutting machine comprises at least a vertical band saw machine.

6. The fixture (100) of claim 4, wherein table (102) is modified by installing brass rollers to further facilitate smooth motion.

7. The fixture (100) of claim 1, wherein the one or more gaskets (104) are made up of a material comprises at least a rubber and a steel.

8. The fixture (100) of claim 1, wherein the table (102) comprises one or more handle (202) in order to facilitate movement of the table (102).