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:
DEVICE FOR MARKING OF CIRCLE ON CURVED AND FLAT SURFACE OF A MARINE VESSEL

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. (201921001451) filed on 11th January, 2019.
TECHNICAL FIELD
[002] The present subject matter described herein generally relates to a device for marking a surface of a pressure hull of a marine vessel, and more specifically to a device for marking a circle or a line on a curved or a flat surface of a pressure hull of a marine vessel.
BACKGROUND
[003] Currently, lines or circles are marked, on surfaces of a submarine, using optical devices and by approximation. Hence, trial and error method is followed for marking lines or circles on the surface of the submarine. Some of the techniques are available that suggests using paper templates for marking lines or circles on the surface of the submarine. However, the templates do not give the required accuracy in marking lines or circles. To properly fit various parts of the submarine with a pressure hull, it is very important to achieve a certain accuracy in marking and cutting operation of the pressure hull. Also, it requires time and skills of a very high caliber to accurately mark lines or circles on the surfaces of the submarine.
SUMMARY
[004] Before the present device is described, it is to be understood that this application is not limited to a particular machine or a device, as there can be multiple possible embodiments that are not expressly illustrated in the present disclosure. 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 and a method for marking and cutting of a pressure hull, 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 marking on a surface of a pressure hull of a marine vessel. The device comprises a marking tube, a sliding guide, a slider and a marking scriber. The marking tube is configured to pass through a hole on the pressure hull. The sliding guide is disposed on the marking tube such that the sliding guide is rotatable about a central axis AA of the marking tube. The slider is disposed on the sliding guide such that the slider is slidable along the central axis AA of the marking tube. The marking scriber is disposed on the slider and one end of the marking scriber comprises a scribing end. During operation of the device, the scribing end of the marking scriber is configured to mark a circle on the surface of the pressure hull by an integrated motion of the sliding guide and the slider.
[006] It is another object of the present subject matter to provide a method of marking on a surface of a pressure hull of a marine vessel by using the above device. The method comprises steps of: making a hole on the pressure hull, inserting a marking tube of the device in the hole of the pressure hull, and providing an integrated motion of a sliding guide and a slider of the device. The integrated motion comprises a rotatable motion of the sliding guide about the central axis AA of the marking tube and a sliding motion of the slider along the central axis AA of the marking tube to keep a scribing end of the marking scriber in contact with the surface of the pressure hull.
[007] It is an object of the present subject matter to provide a device for marking on a surface of a pressure hull on a marine vessel with a better accuracy and with reduced time.
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 device for marking of a pressure hull, in accordance with an embodiment of the present subject matter.
[0011] Figure 2 illustrates a device for marking of a pressure hull, in accordance with another embodiment of the present subject matter.
[0012] Figure 3 illustrates a device for marking of a pressure hull, in accordance with another embodiment of the present subject matter.
[0013] Figure 4 illustrates a device for marking of a pressure hull, in accordance with another embodiment of the present subject matter.
[0014] Figure 5 illustrates a method for marking on a surface of a pressure hull, in accordance with an embodiment of the present subject matter.
[0015] 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
[0016] 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 are now described. The disclosed embodiments are merely exemplary of the disclosure, which may be embodied in various forms.
[0017] 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.
[0018] The present subject matter relates to a device for marking on a surface of a pressure hull on a marine vessel. The device comprises a marking tube, a sliding guide, a slider and a marking scriber. The marking tube is configured to pass through a hole on the pressure hull. The sliding guide is disposed on the marking tube such that the sliding guide is rotatable about a central axis AA of the marking tube. The slider is disposed on the sliding guide such that the slider is slidable along the central axis AA of the marking tube. The marking scriber is disposed on the slider and one end of the marking scriber comprises a scribing end. During operation of the device, the scribing end of the marking scriber is configured to mark a circle on the surface of the pressure hull by an integrated motion of the sliding guide and the slider.
[0019] To operate the device, the hole is made in the pressure hull to insert the marking tube. The marking tube is inserted into the hole so that the marking tube is having substantially similar length exposed on both sides of the pressure hull. The sliding guide and the slider of the device are moved to provide the integrated motion to the marking scriber of the device. The integrated motion comprises a rotatable motion of the sliding guide about the central axis AA of the marking tube and a sliding motion of the slider along the central axis AA of the marking tube to keep the scribing end of the marking scriber in contact with the surface of the pressure hull.
[0020] Hence the present subject matter provides a device for marking on the surface of the pressure hull in a single setup of the device in a reduced time and with less human efforts.
[0021] Referring now to figure 1, a device 100 for marking on a surface 101a of a pressure hull 101 is shown. The device 100 may comprise a marking tube 104, a sliding guide 106, a slider 108 and a marking scriber 110. The marking tube 104 is configured to pass through a hole 102 on the pressure hull 101. The sliding guide 106 may be disposed on the marking tube 104 such that the sliding guide 106 may be rotatable about a central axis AA of the marking tube 104. The slider 108 is disposed on the sliding guide 106 such that the slider 108 may be slidable along the central axis AA of the marking tube 104. The marking scriber 110 may be disposed on the slider 108. One end of the marking scriber 110 comprises a scribing end 110a.
[0022] As the slider 108 along with the marking scriber 110 is disposed on the sliding guide 106, the slider 108 rotates with the sliding guide 106 about the central axis AA of the marking tube 104. The slider 108 may slide within the sliding guide 106 and along the central axis AA of the marking tube 104. The marking scriber 110 being disposed on the slider 108 also slides with the slider 108.
[0023] In an implementation of the device 100, the hole 102 is made in the pressure hull 101 to insert the marking tube 104. The marking tube 104 is inserted into the hole 102 so that the marking tube 104 may have substantially similar length exposed on both sides of the pressure hull 101. A diameter of the circle to be marked on the pressure hull 101 may be defined by distance of the scribing end 110a of the marking scriber 110 from the central axis AA. The marking scriber 110 may be adjusted one time to define the diameter of the required circle to be marked on the pressure hull 101. The device 100 may be used to mark the circle on either surface of the pressure hull 101. In this embodiment, the circle may be marked on the surface 101a of the pressure hull 101. The scribing end 110a of the marking scriber 110 may be brought in contact with the surface 101a of the pressure hull 101 by sliding the slider 108 on the sliding guide 106. Once the scribing end 110a is in contact with the surface 101a, the sliding guide 106 may be rotated. Due to a curvature of the surface 101a, the slider 108 is made to slide to and fro on the sliding guide 106, so that the scribing end 110a always remains in contact with the surface 101a. As the rotation of the sliding guide 106 completes, that results in completion of the marking of circle on the surface 101a.
[0024] It is to be understood that, marking of circle on the surface 101a is completed by an integrated motion of the sliding guide 106 and the slider 108. While the movement of slider 108 on the sliding guide 106 keeps the scribing end 110a in contact with the surface 101a of the pressure hull 101, the rotational movement of the sliding guide 106 provides a circular motion to the scribing end 110a to mark the circle on the surface 101a.
[0025] Now referring to figure 2, an example of the integrated motion of the sliding guide 106 and the slider 108 is illustrated. The slider 108 and the marking scriber 110 is at a first position where the device starts marking of the circle on the surface 101a of the pressure hull 101. As the sliding guide 106 starts rotating about the marking tube 104, a second position of the slider 108 and the marking scriber 110 is achieved which is at 180° from the first position. Hence to move from the first position to the second position, the sliding guide 106 rotates 180° about the marking tube 104 and the slider 108 also slides on the sliding guide 106 for a distance of “D”. Similarly based on the curvature of the surface, the distance “D” moved by the slider 108 may change as the sliding guide 106 rotates about the marking tube 104 to complete the marking of the circle.
[0026] In an embodiment of the present subject matter as shown in figure 3, a holding element 300 may be provided on at least one side of the pressure hull 101 to hold the marking tube 104. The holding element 300 may comprise a plurality of L-channels 310, and a bearing 320. One end of the L-channels 310 may be temporarily secured to the surface 101a. An outer race of the bearing 320 may be fitted to another end of the L-channel 310 and the marking tube 104 is fitted to an inner race of the bearing 320.
[0027] In an implementation of the device 100, the holding element 300 may provide better accuracy in the marking of the pressure hull 101 with the device 100 of previous embodiments. The holding element 300 may be fitted one on each side of the pressure hull 101 to align the axis of the marking tube 104 with the axis of the hole 102.
[0028] In an embodiment of the present subject matter, the marking scriber 110 may be chosen as per the required diameter of the circle to be marked. In another embodiment, the marking scriber 110 may comprise provision to provide variable diameter of the marking circle.
[0029] Further once the marking on the surface 101a is completed, the device may be used to mark the circle on other surface 101b of the pressure hull 101. The slider 108 with the marking scriber 110 may be removed from the sliding guide 106 and can be setup on another side of the pressure hull 101 as illustrated in figure 4. The circle may be marked on the other surface 101b of the pressure hull 101 by operating the device 100 as shown in figure 4. The integrated motion of the slider 108 and the sliding guide 106 will result into marking of the circle on the other surface 101b. Once the marking on both sides of the pressure hull 101 is completed, cutting operation can be performed by a gas cutter by following the markings.
[0030] In another embodiment of the present subject matter, the device 100 may also be used for marking a straight line on any surface of the marine vessel.
[0031] Now referring to figure 5, a method 500 of marking on a pressure hull 101 of a marine vessel by using the device 100 is shown. The method 500 comprising steps as following.
[0032] Initially at block 502, a hole 102 may be made on the pressure hull 101 approximately at the center of the final desired marking.
[0033] Further at block 504, a marking tube 104 of the device 100 may be inserted in the hole 102 in such a way to attain a substantially similar portion of the marking tube 104 on both sides of the pressure hull 101.
[0034] Furthermore at block 506, an integrated motion of the sliding guide 106 and the slider 108 is provided to mark the circle on the surface 101a of the pressure hull 101. The integrated motion comprises: a rotatable motion of the sliding guide 106 about the central axis (AA) of the marking tube 104 and a sliding motion of the slider 108 along the central axis (AA) of the marking tube 104 to keep a scribing end 110a of the marking scriber 110 in contact with the surface (101a, 101b) of the pressure hull 101.
[0035] Exemplary embodiments discussed above may provide certain advantages. Though not required to practice aspects of the disclosure, these advantages may include the following.
[0036] Some object of the present invention enables reducing time for setting and marking.
[0037] Some embodiments of the device enable the increased safety of the operator while marking and cutting the pressure hull.
[0038] Some object of the present invention provides a device which marks circle or line on 3D conical surface.
[0039] Some object of the present invention provides a device which marks line or circle on flat surfaces.
[0040] Some embodiments of the device reduce a requirement of manpower to perform the operation of marking on the pressure hull. This whole operation of marking can be performed by only two operators.
[0041] 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 marking on a surface (101a, 101b) of a pressure hull (101) of a marine vessel, wherein the device (100) comprises:
a marking tube (104) configured to pass through a hole (102) on the pressure hull (101);
a sliding guide (106) disposed on the marking tube (104), wherein the sliding guide (106) is rotatable about a central axis (AA) of the marking tube (104);
a slider (108) disposed on the sliding guide (106), wherein the slider (108) is slidable along the central axis (AA) of the marking tube (104); and
a marking scriber (110) disposed on the slider (108) wherein one end of the marking scriber (110) comprises a scribing end (110a), wherein
during operation of the device (100), the scribing end (110a) of the marking scriber (110) is configured to mark a circle on the surface (101a, 101b) of the pressure hull (101) by an integrated motion of the sliding guide (106) and the slider (108).
2. The device (100) as claimed in claim 1, wherein the integrated motion comprises:
a rotatable motion of the sliding guide (106) about the central axis (AA) of the marking tube (104) and
a sliding motion of the slider (108) along the central axis (AA) of the marking tube (104).
3. The device (100) as claimed in claim 1, wherein the device (100) comprises a holding element (300) to hold the marking arm (104) of the device (104).
4. The device (100) as claimed in claim 3, wherein the holding element (300) comprises:
a bearing (320) wherein, an inner race of the bearing (320) is rotatably secured to the marking tube (104) and
a plurality of L-channels (310) wherein one end of the L-channels (310) is temporarily secured to the surface (101a, 101b) of the pressure hull (101) and another end of the L-channels (310) is secured to an outer race of the bearing (320).
5. The device (100) as claimed in claim 1, wherein the surface (101a, 101b) of the pressure hull (101) is a curved surface.
6. The device (100) as claimed in claim 1, wherein the surface (101a, 101b) of the pressure hull (101) is a flat surface.
7. A method (500) of marking on a surface (101a, 101b) of a pressure hull 101 of a marine vessel by using a device (100), wherein the method (500) comprises steps of:
making a hole (102) on the pressure hull (101);
inserting a marking tube (104) of the device 100 in the hole (102) of the pressure hull (101); and
providing an integrated motion of a sliding guide (106) and a slider (108) of the device (100); wherein the integrated motion comprises:
a rotatable motion of the sliding guide (106) about the central axis (AA) of the marking tube (104) and
a sliding motion of the slider (108) along the central axis (AA) of the marking tube (104) to keep a scribing end (110a) of the marking scriber (110) in contact with the surface (101a, 101b) of the pressure hull (101).