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 DEVICE FOR ROLLING A FLAT BAR

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 201921001810 filed on January 15, 2019.

TECHNICAL FIELD
[002] The present subject matter described herein, in general, relates to a device for rolling a flat bar.

BACKGROUND
[003] Generally, pre-insulated double spiral ducts are used for air conditioning and ventilation in a ship. The pre-insulated double spiral ducts comprise a circular Half G fitting assembly. The circular Half G fitting assembly comprises a ring made up of a MS flat bar and a flange secured to the ring by welding.
[004] Conventionally, a process of rolling the flat bar to form a ring is performed using rolling machines. The conventional process involves dismantling and re-installation of a bearing housing for removing a ring after rolling operation. The conventional process also leads to a mismatch between ends of the flat bar after the rolling process is performed. The conventional process requires continuous manual adjustment and re-alignment of the rolled flat bar to achieve circularity of the flat bar.

OBJECT OF INVENTION
[005] Main object of the present subject matter is to develop a device for rolling a flat bar.
[006] Another object of the present subject matter is to minimize a mismatch between ends of the flat bar after rolling of the flat bar.
[007] Yet another object of the present subject matter is to reduce the manual attempts required to achieve circularity of the flat bar after rolling, with the help of a bearing assembly.
[008] Another object of the present subject matter is to reduce time required in performing a rolling operation of the flat bar by eliminating additional work of dismantling & re-installation of a bearing housing on rolling machine.
[009] Yet another object of the present subject matter is to eliminate a process of manual rectification required in rolling the flat bar.
[0010] Another object of the present subject matter is to reduce cost required in performing a rolling operation of the flat bar.

SUMMARY
[0011] Before the present device for rolling a flat bar is described, it is to be understood that this application is not limited to the particular machine or an apparatus, and methodologies described, 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 technology being implemented in the device for rolling a flat bar. 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.
[0012] In one implementation, a device for rolling a flat bar is disclosed. The device may comprise a base plate. Further, a stud and a nut assembly may be configured to be centrally secured to said base plate. The device may further comprise a handle configured with a sleeve. The said handle may be pivotably mounted on said stud through said sleeve. Further, a longitudinal slot may be provided on said handle. The device may further comprise a bearing assembly configured to be adjustably mounted in said longitudinal slot of said handle. The device may further comprise a cylindrical section configured to be concentrically mounted and rigidly secured on said base plate. The said base plate may be is mounted on a stand. The device may further comprise a stopper assembly configured to be adjustably secured on said base plate for securing a flat bar.
[0013] In another implementation, ends of said flat bar may be configured to be provided with a circular profile to match an outer circular profile of said cylindrical section. Further, said stopper assembly may be adjustably secured to a radial slot provided on said base plate for accommodating a flat bar of variable thickness. Furthermore, said stopper assembly may be configured to be provided with an internal threaded through hole for mounting a bolt for securing said flat bar between said stopper assembly and said cylindrical section. Furthermore, said bearing assembly may be configured to be adjustably mounted on said longitudinal slot for accommodating a flat bar of variable thickness. Furthermore, said bearing assembly may be configured to be rotatably secured to a threaded bolt, and wherein said threaded bolt may be secured to said longitudinal slot. Furthermore, said flat bar may be rolled to form a ring, and wherein said ring may be configured to be secured on said cylindrical section with at least one clamp for tack welding the mating ends of said ring. Furthermore, a flange may be configured to be secured on said ring by a tack welding means to form a circular Half-G fitting assembly.
[0014] In yet another implementation, a method of rolling a flat bar using the device is disclosed. The method may comprise securing at least one end of a flat bar between a stopper assembly and a cylindrical section mounted on a base plate. The method may further comprise rotating a handle on said at least one secured end of said flat bar to roll said flat bar into a ring through a bearing assembly mounted on said handle. The method may further comprise clamping said ring on said cylindrical section with at least one clamp for tack welding both mating ends of said ring. The method may comprise removing said at least one clamp from said ring. The method may further comprise mounting a flange on said ring to match circumferences of said flange and said ring. The method may further comprise welding said matched ends of said flange and said ring to form a Half-G fitting assembly.

BRIEF DESCRIPTION OF THE DRAWINGS
[0015] 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 drawings:
[0016] The detailed description is described with reference to the accompanying figure. 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 drawings to refer like features and components.
[0017] Figure 1A illustrates a conventional process for pre-bending two ends of a flat bar.
[0018] Figure 1B illustrates a conventional process showing rolling operation of a flat bar.
[0019] Figure 1C illustrates a conventional process of dismantling a bearing housing.
[0020] Figure 1D illustrates a conventional process of installation of a bearing housing.
[0021] Figure 1E illustrates a mismatch of the ends of the flat bar using the conventional process.
[0022] Figure 1F illustrates an overlap of the ends of the flat bar using the conventional process.
[0023] Figure 1G illustrates a conventional process of tacking and welding of a seam joint.
[0024] Figure 1H illustrates a conventional process of rectification for achieving circularity of the rolled flat bar.
[0025] Figure 2A illustrates a schematic diagram of a device 200 for rolling a flat bar, in accordance with an embodiment of the present subject matter.
[0026] Figure 2B illustrates a schematic diagram of a front view of the device 200 for rolling a flat bar, in accordance with an embodiment of the present subject matter.
[0027] Figure 2C illustrates a schematic diagram of a top view of the device 200 for rolling a flat bar, in accordance with an embodiment of the present subject matter.
[0028] Figure 2D illustrates a schematic diagram of a handle 212 integrated in the device 200, in accordance with an embodiment of the present subject matter.
[0029] Figure 2E illustrates a schematic diagram of a bearing assembly 218 integrated in the device 200, in accordance with an embodiment of the present subject matter.
[0030] Figure 2F illustrates a schematic representation of a flat bar 222 integrated in the device 200, in accordance with an embodiment of the present subject matter.
[0031] Figure 2G, 2H, and 2I illustrate a schematic representation of a securing and rolling operation of the flat bar 222, in accordance with an embodiment of the present subject matter.
[0032] Figure 2J illustrates a schematic diagram of clamps 224, in accordance with an embodiment of the present subject matter.
[0033] Figure 2K illustrates a schematic representation of a clamping operation by using the clamps 224, in accordance with an embodiment of the present subject matter.
[0034] Figure 2L illustrates a schematic representation of a flange 226 secured on the device 200, in accordance with an embodiment of the present subject matter
[0035] Figure 3 illustrates a method 300 for rolling a flat bar on a cylindrical section using the device 200, in accordance with an embodiment of the present subject matter.
[0036] The figures depicts an embodiment of the present disclosure for purpose of illustration only. One skilled in the art will readily recognize from the following discussion that alternative embodiments of the structure and method illustrated herein may be employed without departing from the principles of the disclosure described herein.

DETAILED DESCRIPTION
[0037] Some embodiments of this disclosure, illustrating all its features, will now be discussed in detail. The words “comprising”, “generating", “receiving”, “forming” 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. Although any systems 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, device for rolling a flat bar are now described. The disclosed embodiments of a device for rolling a flat bar are merely exemplary of the disclosure, which may be embodied in various forms.
[0038] 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 of a device for rolling a flat bar 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.
[0039] Conventionally, a process of rolling a flat bar for forming a Half-G fitting assembly is performed using rolling machines. However, the conventional process may lead to a mismatch between ends of the flat bar after the rolling process is performed. Further, the conventional process may lead to a delay in removal of the rolled flat bar from the roller machine due to continuous dismantling and re-installation of a bearing housing as the bearing housing needs to be dismantled and re-installed as per requirement. The conventional process may require a manual rectification to be made for ensuring circularity after a seam joint of the ends of the rolled flat bar is achieved. Further, the conventional process may be complex and may consume a time duration of average 22 minutes for performing a fabrication of one Half-G fitting assembly of various sizes. In addition, the conventional process may be costly due to a requirement of rolling machines and may also result in decreased productivity.
[0040] The present subject matter overcomes the above problems in the conventional process. The present subject matter discloses a device for rolling a flat bar. The device may comprise a base plate. Further, a stud and a nut assembly may be configured to be centrally secured to said base plate. The device may further comprise a handle is configured with a sleeve. The said handle may be pivotably mounted on said stud through said sleeve. Further, a longitudinal slot may be provided on said handle. The device may further comprise a bearing assembly configured to be adjustably mounted in said longitudinal slot of said handle. The device may further comprise a cylindrical section configured to be concentrically mounted and rigidly secured on said base plate. The device may further comprise a stopper assembly configured to be adjustably secured on said base plate for securing a flat bar. Further, said flat bar may be rolled to form a ring. The said ring may be configured to be secured on said cylindrical section with at least one clamp for tacking the mating ends of said ring. Further, a flange may be configured to be secured on said tacked ring by a welding means to form a circular Half-G fitting assembly for pre-insulated double spiral duct used for air conditioning and ventilation in the ship.
[0041] The present subject matter overcomes the problem of mismatch between ends of the flat bar after rolling through said bearing assembly and a revolving motion of said handle. The present subject matter further eliminates the process of manual rectification, thereby reducing fatigue of workmen. Further, the present subject matter reduces number of attempts required to achieve circularity of the flat bar with the help of said bearing assembly. Further, the present subject matter further eliminates additional work of dismantling & installation of the bearing housing. In addition, present subject matter reduces time consumption to fabricate one Half-G fitting assembly to average 12 minutes, as compared to the conventional process, wherein the time consumption is 22 minutes. The present subject matter thereby provides an improved device for rolling the flat bar on the cylindrical section for forming the Half-G fitting assembly.
[0042] Referring now to figure 1A, a schematic diagram of a conventional process for pre-bending two ends of a flat bar is illustrated.
[0043] In the conventional process, two ends of a flat bar may be pre-bended into a circular profile.
[0044] Referring now to Figure 1B, a schematic diagram of a conventional process showing rolling operation of a flat bar is illustrated.
[0045] In the conventional process, a rolling operation of the flat bar may be performed by using a rolling a machine.
[0046] Referring now to Figure 1C, a schematic diagram of a conventional process of dismantling a bearing housing is illustrated.
[0047] In the conventional process, a bearing housing may be dismantled for removing the rolled flat bar.
[0048] Referring now to Figure 1D, a schematic diagram of a conventional process of installation of a bearing housing is illustrated.
[0049] In the conventional process, a bearing housing may be installed after inserting a new flat bar for rolling.
[0050] Referring now to Figure 1E, a schematic diagram of a mismatch of the ends of the flat bar using the conventional process is illustrated.
[0051] In the conventional process, the ends of flat bar may be mismatched after performing the rolling operation.
[0052] Referring now to Figure 1F, a schematic diagram of an overlap of the ends of the flat bar using the conventional process is illustrated.
[0053] In the conventional process, the ends of flat bar may be overlapped after performing the rolling operation, due to the mismatch between the ends of the flat bar.
[0054] Referring now to Figure 1G, a schematic diagram of a conventional process of tacking and welding of a seam joint is illustrated.
[0055] In the conventional process, tacking and welding may be performed for eliminating the mismatch and overlap of the ends of the flat bar after performing the rolling operation.
[0056] Referring now to Figure 1H, a schematic diagram of a conventional process of rectification is illustrated.
[0057] In the conventional process, rectification may be performed for eliminating ovality of the flat bar after performing the rolling operation.
[0058] Referring now to figure 2A, a schematic diagram of a device 200 for rolling a flat bar, is illustrated in accordance with an embodiment of the present subject matter.
[0059] In one embodiment, a stud 206 with a nut 208 assembly may be centrally secured to a base plate 204. The said base plate 204 may be circular in shape. Further, the device 200 may comprise a handle 212. The said handle 212 may be configured with a sleeve 214. The said handle may be pivotably mounted on said stud 206 through said sleeve 214. The said handle 212 may further comprise a longitudinal slot 216. Further, a bearing assembly 218 may be configured to be secured with a threaded bolt 228. The said bearing assembly 218 may be configured to be adjustably mounted on said longitudinal slot 216 through said threaded bolt 228.
[0060] In one embodiment, a cylindrical section 202 may be configured to be concentrically mounted and rigidly secured on said base plate 204. The said base plate 204 may be mounted on a stand 234. Further, said base plate 204 may comprise a radial slot 236. Further, a stopper assembly 210 may be configured to be adjustably secured to said radial slot 236. The said stopper assembly 210 may be provided with an internal threaded through hole for mounting a bolt 220 for securing a flat bar 222 between said stopper assembly 210 and said cylindrical section 202. The said stopper assembly 210 may be adjustably secured to said radial slot 236 for accommodating a flat bar 222 of variable thickness.
[0061] Referring now to figure 2B, wherein a schematic diagram of a front view of the device 200 for rolling a flat bar, is illustrated in accordance with an embodiment of the present subject matter.
[0062] In one embodiment, a front view of the device 200 for rolling a flat bar is disclosed.
[0063] Referring now to figure 2C, a schematic diagram of a top view of the device 200 for rolling a flat bar.
[0064] In one embodiment, a top view of the device 200 for rolling a flat bar is disclosed.
[0065] Referring now to figure 2D, a schematic diagram of a handle 212 integrated in the device 200 is illustrated in accordance with an embodiment of the present subject matter.
[0066] In one embodiment, said handle 212 may comprise said longitudinal slot 216. Further, said bearing assembly 218 may be configured to be adjustably mounted on said longitudinal slot 216. The handle 212 may be rotated to roll said flat bar 222 on said cylindrical section 202 with the aid of said bearing assembly 218 to form a ring 232.
[0067] Referring now to Figure 2E, a schematic diagram of a bearing assembly 218 integrated in the device 200 is illustrated in accordance with an embodiment of the present subject matter.
[0068] In one embodiment, said bearing assembly 218 with said threaded bolt 228 may be adjustably mounted on said longitudinal slot 216 provided on said handle 212. The said bearing assembly 218 may be configured for rolling said flat bar 222 on said cylindrical section 202 through a revolving motion of said handle 212 to form said ring 232.
[0069] Referring now to figure 2F, a schematic representation of a flat bar 222 integrated in the device 200 is illustrated in accordance with an embodiment of the present subject matter.
[0070] In one embodiment, ends of a flat bar 222 may be provided with a circular profile to match said circular profile with an outer circular profile of said cylindrical section 202.
[0071] In one embodiment, the figures 2G, 2H and 2I are explained together.
[0072] Referring now to figure 2G, 2H and 2I, wherein a schematic diagram of a securing and rolling operation of the flat bar 222 is illustrated, in accordance with an embodiment of the present subject matter.
[0073] In one embodiment, said flat bar 222 may be secured between said stopper assembly 210 and said cylindrical section 202 through said bolt 220 provided on said stopper assembly 210. Further, said flat bar 222 may be configured to roll on said cylindrical section 202 though said handle 212 and said bearing assembly 218 to form a ring 232. The said handle 212 may be configured with a revolving motion to bend said flat bar 222 with the aid of said bearing assembly 218.
[0074] Referring now to Figure 2J, a schematic diagram of clamps 224 is illustrated, in accordance with an embodiment of the present subject matter.
[0075] In one embodiment, said ring 232 may be configured to be secured on said cylindrical section 202 with at least one clamp 224 for tacking the mating ends of said ring 232.
[0076] Referring now to Figure 2K, wherein a schematic representation of a clamping operation by using the clamps 224 is illustrated, in accordance with an embodiment of the present subject matter.
[0077] In one embodiment, said ring 232 may be secured with said at least one clamp 224 to prevent any spring-back action after two ends of said ring 232 have been rolled. Further, a process of tack welding may be performed at a joint to seal both the ends of said ring 232.
[0078] Referring now to Figure 2L, wherein a schematic representation of a flange 226 secured on the device 200 is illustrated, in accordance with an embodiment of the present subject matter.
[0079] In one embodiment, a flange 226 may be configured to be secured on said tacked ring 232 by a welding means to form a circular Half-G fitting assembly for a pre-insulated double spiral duct used for air conditioning and ventilation.
[0080] Referring now to figure 3. The figure 3 illustrates a method 300 for rolling a flat bar on the device 200, is disclosed in accordance with an embodiment of the present subject matter.
[0081] The order in which the method 300 is described is not intended to be construed as a limitation, and any number of the described method blocks can be combined in any order to implement the method 300 or alternate methods. Additionally, individual blocks may be deleted from the method 300 without departing from the spirit and scope of the subject matter described herein. Furthermore, the method 300 can be implemented in any suitable hardware, software, firmware, or combination thereof. However, for ease of explanation, in the embodiments described below, the method 300 may be considered to be implemented in the above described device 200.
[0082] At block 302, at least one end of a flat bar 222 may be secured between a stopper assembly 210 and a cylindrical section 202 mounted on a base plate 204.
[0083] At block 304, a handle 212 may be rotated on said at least one secured end of said flat bar to roll said flat bar into a ring 232 through a bearing assembly 218 mounted on said handle 212.
[0084] At block 306, said ring 232 may be clamped on said cylindrical section 202 with at least one clamp 224 for tack welding both the mating ends of said ring 232.
[0085] At block 308, said at least one clamp 224 may be removed from said ring 232.
[0086] At block 310, a flange 226 may be mounted on said ring 232 to match circumferences of said flange 226 and said ring 232.
[0087] At block 312, said matched ends of said flange 226 and said ring 232 may be welded to form a half-G fitting assembly.
[0088] 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.
[0089] Some objects of the present invention enable minimization of mismatch between ends of the flat bar after rolling of the flat bar.
[0090] Some objects of the present invention enable reduction in time consumption for fabrication of one circular Half G fitting assembly.
[0091] Some objects of the present invention enable reduction in number of manual attempts required to perform a rolling operation.
[0092] Some objects of the present invention enable reduction in sound pollution due to hammering operation while rolling the flat bar.
[0093] Some objects of the present invention enable reduction in cost and complexity for performing a rolling operation.
[0094] Although implementations of a device for rolling a flat bar 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 or methods described. Rather, the specific features and methods are disclosed as examples of implementations of a device for rolling a flat bar.
,CLAIMS:
1. A device (200) for rolling a flat bar (222) comprising:
a base plate (204);
a stud (206) and a nut (208) assembly configured to be centrally secured to said base plate (204);
a handle (212) configured with a sleeve (214), wherein said handle (212) is pivotably mounted on said stud (206) through said sleeve (214);
a longitudinal slot (216) provided on said handle (212);
a bearing assembly (218) configured to be adjustably mounted in said longitudinal slot (216) of said handle (212);
a cylindrical section (202) configured to be concentrically mounted and rigidly secured on said base plate (204), wherein said base plate (204) is mounted on a stand (234); and
a stopper assembly (210) configured to be adjustably secured on said base plate (204) for securing a flat bar (222).

2. The device (200) as claimed in claim 1, wherein ends of said flat bar (222) are configured to be provided with a circular profile to match an outer circular profile of said cylindrical section (202).

3. The device (200) as claimed in claim 1, wherein said stopper assembly (210) is adjustably secured to a radial slot (236) provided on said base plate (204) for accommodating a flat bar of variable thickness.

4. The device (200) as claimed in claim 1, wherein said stopper assembly (210) is configured to be provided with an internal threaded through hole for mounting a bolt (220) for securing said flat bar (222) between said stopper assembly (210) and said cylindrical section (202).

5. The device (200) as claimed in claim 1, wherein said bearing assembly (218) is configured to be adjustably mounted on said longitudinal slot (216) for accommodating a flat bar of variable thickness.

6. The device (200) as claimed in claim 1, wherein said bearing assembly (218) is configured to be rotatably secured to a threaded bolt (228), and wherein said threaded bolt (228) is secured to said longitudinal slot (216).

7. The device (200) as claimed in claim 1, wherein said flat bar (222) is rolled to form a ring (232), and wherein said ring (232) is configured to be secured on said cylindrical section (202) with at least one clamp (224) for tack welding both the mating ends of said ring (232).

8. The device (200) as claimed in claim 1, wherein a flange (226) is configured to be secured on said tacked ring (232) by a tack welding means to form a circular Half-G fitting assembly.

9. A method (300) for rolling a flat bar (222) on a device (200) comprising the steps of:
• securing at least one end of a flat bar (222) between a stopper assembly (210) and a cylindrical section (202) mounted on a base plate (204);
• rotating a handle (212) on said at least one secured end of said flat bar to roll said flat bar into a ring (232) through a bearing assembly (218) mounted on said handle (212);
• clamping said ring (232) on said cylindrical section (202) with at least one clamp (224) for tack welding both the mating ends of said ring (232);
• removing said at least one clamp (224) from said ring (232);
• mounting a flange (226) on said ring (232) to match circumferences of said flange (226) and said ring (232); and
• welding said matched ends of said flange (226) and said ring (232) to form a half-G fitting assembly.