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 FITTING OF GIRDERS

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 APPLICATION AND PRIORITY

[001] The present application claims priority from Indian Patent application no. (201821041436) filed on 01st November, 2018.
TECHNICAL FIELD
[002] The present subject matter described herein generally relates to a device for fitting of girders, and more specifically to a device decreasing a space between a girder and a surface on a deck of a marine vessel.
BACKGROUND
[003] The structure of a marine vessel is very long and heavy so it is very difficult to fabricate as a single structure so the marine vessel is divided into blocks and these blocks are further divided into units. These units are fabricated in the shops. While fabricating unit, frames and girders are used as stiffener members of the marine vessel. These frames and girders provide strength to the structure. The girders are to be joined to the deck by means of bolting or welding. Before the joining process, the girders need to be pressed on the deck to minimize the gap between the girder and a surface on the deck. In existing method to press the girder on the deck, the surface on the deck needs to be grinded first and then the girder is tapped by a hammer to minimize the gap between the girder and the surface on the deck. The present invention provides an improved device to minimize the gap.

SUMMARY
[004] Before the present device is described, it is to be understood that this application is not limited to the particular machine or device, 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 device for fitting of girders, 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 device for decreasing a space between a girder and a surface on a deck of a marine vessel. The device comprises a horizontal bar and a plurality of vertical bars. Each of the plurality of vertical bars comprise a first end and a second end. The horizontal bar is connected between the first ends of the plurality of vertical bars. The second ends of the plurality of vertical bars comprise a plurality of protrusions and a locking slot. A bulbar is engaged with the locking slot and a pull force is exerted on the bulbar by a lifting means.
[006] The present subject matter further describes a method of decreasing a space between a girder and a surface on a deck of a marine vessel using the device. The method comprising the steps of: positioning the girder on a bulbar, engaging the bulbar with the locking slot of the device, positioning a lifting means between the girder and a horizontal bar of the device, and exerting a pull force on the bulbar by a lifting means.
[007] It is an object of the present subject matter to decrease space between a girder and a surface on a deck of a marine vessel.
BRIEF DESCRIPTION OF THE DRAWINGS
[008] 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 device disclosed in the document and the drawing.
[009] 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.
[0010] Figure 1 illustrates a view of a device for fitting of girders, in accordance with an embodiment of the present subject matter.
[0011] Figure 2 illustrates a method for fitting of girders, in accordance with an embodiment of the present subject matter.
[0012] Figure 3 illustrates another view of a device for fitting of girders, in accordance with an embodiment of the present subject matter.
[0013] 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 structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.
DETAILED DESCRIPTION
[0014] 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 devices 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, devices and methods are now described. The disclosed embodiments are merely exemplary of the disclosure, which may be embodied in various forms.
[0015] 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.
[0016] A number of girders/frames are required to build a marine vessel. The girders and frames provide strength to the structural parts of the marine vessel. The girders are required to be fitted on surface on a deck of a marine vessel. The present subject matter describes a device to fit a girder on the deck by decreasing a space between the girder and the surface on the deck. The device comprises a horizontal bar and a plurality of vertical bars. Each of the plurality of vertical bars comprise a first end and a second end. The horizontal bar is connected between the first ends of the plurality of vertical bars. The second ends of the plurality of vertical bars comprise a plurality of protrusions and a locking slot. A bulbar is engaged with the locking slot and a pull force is exerted on the bulbar by a lifting means.
[0017] The present subject matter further describes a method of decreasing a space between a girder and a surface on a deck of a marine vessel using the device. The method comprising the steps of: positioning the girder on a bulbar, engaging the bulbar with the locking slot of the device, positioning a lifting means between the girder and a horizontal bar of the device, and exerting a pull force on the bulbar by a lifting means.
[0018] When the bulbar is engaged with the locking slot. The first protrusion and the second protrusion secure the bulbar within the locking slot. The first protrusion pulls the bulbar in the direction of pull force applied by the lifting means and the second protrusion may secure the bulbar in the required orientation whenever a pull force is exerted on the bulbar. When the lifting means is operated, the horizontal bar receives a force. The force is then transferred to the bulbar through the plurality of vertical bars and through the plurality of protrusions. In this position the bulbar gets locked to the device resulting a pressing force on the girder. The girder is pressed towards the surface on the deck and hence decreasing the space in between the girder and the surface on the deck.
[0019] Hence the present subject matter provides advantages such as reduced time and less human efforts to fit a girder on the surface on a deck over the conventional method.
[0020] Referring now to figure 1, a device 100 for decreasing a space 222 (shown in figure 3) between a girder 210 (shown in figure 3) and a surface 230 (shown in figure 3) on a deck (not shown) of a marine vessel is shown. The device 100 may comprise a horizontal bar 102 and a plurality of vertical bars 104. Each of the plurality of vertical bars 104 may comprise a first end 106 and a second end 108. The horizontal bar 102 may be connected to the first ends 106 of the plurality of vertical bars 104. The second ends 108 of the plurality of vertical bars 104 may comprise a plurality of protrusions (114, 116) and a locking slot 120. A bulbar 212 (shown in figure 3) may be engaged with the locking slot 120 and a pull force may be exerted on the bulbar 212 by a lifting means 224 (shown in figure 3).
[0021] In an embodiment of the present subject matter, the second ends 108 of the plurality of vertical bars 104 may comprise a first protrusion 114 and a second protrusion 116. The first protrusion 114 and the second protrusion 116 may be secured opposite to each other. In another embodiment, a gap between the first protrusion 114 and the second protrusion 116 may be proportionate to the height of the bulbar 212.
[0022] In an embodiment, the device 100 may further comprise a strengthening element 122 at a joint between the horizontal bar 102 and the plurality of vertical bars 104. The strengthening element 122 provides extra strength to the device 100 to perform any operation under high load.
[0023] In an embodiment, the bulbar 212 may be an L-shaped bar. While performing the operation the bulbar 212 may be locked with the locking slot 120. The first protrusion 114 and the second protrusion 116 secure the bulbar 212 within the locking slot 120. The first protrusion 114 pulls the bulbar 212 in the direction of pull force applied by the lifting means 224 and the second protrusion 116 may secure the bulbar 212 in the required orientation whenever a pull force is exerted on the bulbar 212.
[0024] Referring to figure 2, a method comprising steps of decreasing the space 222 between a girder 210 and a surface 230 on a deck of a marine vessel 210 by using the device 100 is shown. The order in which the method 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 or alternate methods. Additionally, individual blocks may be deleted from the method without departing from the spirit and scope of the subject matter described herein. However, for ease of explanation, in the embodiments described below, the method may be considered to be implemented in the above described device 100.
[0025] In an embodiment of the subject matter, the girder 210 needs to be fitted on a surface 230 on a deck (not shown). Initially at block 202, the girder 210 may be positioned on the bulbar 212 of the deck in a desired orientation in which the girder 210 needs to be fitted. Further at block 204, the bulbar 212 may be engaged into the locking slot 120 of the device 100. The plurality of protrusions (114, 116) and the locking slot 120 may lock the bulbar 212 in the required orientation. Furthermore, at block 206, the lifting means 224 may be positioned between the girder 210 and the horizontal bar 102 of the device 100. At block 208, the lifting means 224 may be operated to exert a pull force on the bulbar 212.
[0026] Referring to figure 3, when the lifting means 224 is operated, the horizontal bar 102 receives a force. The force is then transferred to the bulbar 212 through the plurality of vertical bars 104 and through the plurality of protrusions (114, 116). In this position the bulbar 212 gets locked to the device 100 resulting a pressing force on the girder 210. The girder 210 is pressed towards the surface 230 on the deck and hence decreasing the space 222 in between the girder 210 and the surface 230 on the deck.
[0027] In an embodiment of the subject matter, the lifting means 224 may be a hydraulic jack. The hydraulic jack may be used to exert force on the device 100 and the girder 210.
[0028] Exemplary embodiments discussed above may provide certain advantages. Though not required to practice aspects of the disclosure, these advantages may include the following.
[0029] Some embodiments of the subject matter enable the increased safety of the operator while fitting the girders on the deck.
[0030] Some embodiments of the subject matter reduce time for fitting of girders on the deck.
[0031] Some embodiments of the subject matter reduce fatigue on the operator as by use of present subject matter, the girders or bulbar are not required to be hammered or tapped.
[0032] Some embodiments of the subject matter minimize the chances of error while fitting the girders on the deck.
[0033] Although implementations for the device 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 or methods described. Rather, the specific features and methods are disclosed as examples of implementation for the device 100.
,CLAIMS:1. A device (100) for decreasing a space (222) between a girder (210) and a surface (230) on a deck of a marine vessel, the device (100) comprising:
a horizontal bar (102); and
a plurality of vertical bars (104), wherein each of the plurality of vertical bars (104) comprising:
a first end (106) and a second end (108), wherein the horizontal bar (102) is connected between the first ends (106) of the plurality of vertical bars (104); and
the second ends (108) of the plurality of vertical bars (104) comprise a plurality of protrusions (114, 116) and a locking slot (120), wherein a bulbar (212) is engaged with the locking slot (120) and a pull force is exerted on the bulbar (212) by a lifting means (224).
2. The device (100) as claimed in claim 1, wherein a gap between the plurality of protrusions (114, 116) is proportionate to the height of the bulbar (212).

3. The device (100) as claimed in claim 1, wherein the device (100) further comprises a strengthening element (122) at a joint between the horizontal bar (102) and the plurality of vertical bars (104).

4. The device (100) as claimed in claim 1, wherein the bulbar (212) is an L-shaped bar.

5. The device (100) as claimed in claim 1, wherein the lifting means (224) is a hydraulic jack.

6. A method of decreasing a space (222) between a girder (210) and a surface (230) on a deck of a marine vessel using a device (100), the method comprising the steps of:
positioning the girder (210) on a bulbar (212);
engaging the bulbar (212) with the locking slot (120) of the device (100);
positioning a lifting means (224) between the girder (210) and a horizontal bar (102) of the device (100); and
exerting a pull force on the bulbar (212) by operating a lifting means (224).