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 WINCH TO DROP AN UNDER WATER SUBMARINE TESTING APPARATUS

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 201821043997 filed on November 22, 2018.

TECHNICAL FIELD
[002] The present subject matter described herein generally relates to a winch to drop an object and more particularly a winch to lift and submerge/drop a testing object.

BACKGROUND
[003] In a conventional method, a ship deck crane is used to submerge/drop and lift a testing object inside a deep sea. The ship deck crane may pose various challenges during submerging and lifting of the testing object. One of the challenges is that it may not be suitable enough to submerge testing object inside deep sea as a speed, a position and a braking system of the ship deck crane may not be controlled. Another challenge is that the ship deck crane may uncontrollably swing the testing object, thereby increasing the possibilities of damage to the vessel deck/body.

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 winch to drop an object, 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 winch to drop an object. The winch may comprise a motor connected with a dual braking system. The dual braking system may comprise an electromagnetic brake and a thruster. The winch may further comprise a drive shaft driven by the motor. The winch may further comprise a drum, wherein a circumference of drum may be surrounded by a rope. The drive shaft may be coupled to the drum through a drive gear. The drum may rotate in one direction for facilitating dropping/submerging of an object and may rotate in another direction for facilitating lifting of the object. The winch may further comprise a brake liner attached at extreme corners of the drum and may be connected to the drive shaft, wherein upon application of a brake by the dual braking system, the brake liner may get compressed. The compression of the brake liner may provide frictional force to the drum in order to control a rotational speed of the drum and thereby may facilitate dropping of the object in a controlled manner.

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 a front view of a winch 100 to drop an object, in accordance with an embodiment of the present subject matter.
[009] Figure 2 illustrates a top view 200 of a winch 100 to drop an object, in accordance with an embodiment of the present subject matter.
[0010] Figure 3 illustrates power and control circuit DIG for winch control panel, 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 winch 100 to drop the object 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 winch to drop an object is disclosed. The winch may comprise a motor. The motor may be connected with a dual braking system. The dual braking system may further comprise an electromagnetic brake and a thruster. The winch may further comprise a drive shaft that may be driven by the motor. The winch may further comprise a drum. A circumference of the drum may be surrounded by a rope. Further, the drive shaft may be coupled to the drum through a drive gear. The drum may rotate in one direction for facilitating dropping/submerging of the object and may rotate in another direction for facilitating lifting of the object. The winch may further comprise a brake liner attached at extreme corners of the drum and may be connected to the drive shaft. Further, upon application of a brake by the dual braking system, the brake liner may get compressed. The compression of the brake liner may provide frictional force to the drum in order to control a rotational speed of the drum and thereby may facilitate dropping of the object in a controlled manner.
[0015] In one embodiment, the winch may be supported by a frame. Further, one or more lifting hook may be mounted on the top of the frame for facilitating mounting of the frame on a deck of a ship.
[0016] In one embodiment, the winch may further comprise a braking lever for facilitating manual braking in case of emergency. The braking lever may have similar functioning as the dual braking system.
[0017] Hence, the winch to drop the object is technically advanced. The winch may be a portable and thus may be shifted easily from one place to another. The design of the winch may facilitate submerging and lifting of the testing object in controlled manner i.e. by controlling speed, braking and position.
[0018] Referring to figure 1, that represents a front view of a winch 100 to drop an object, in accordance with an embodiment of the present subject matter.
[0019] The winch 100 may comprise one or more lifting hook 102, a drive shaft 104, a motor 106 which may be connected with a dual braking system (not shown in figure), a drive gear 108, a frame 110, a brake liner 112, a drum 114, a rope 118 and a braking lever 116.
[0020] In one embodiment, the winch 100 may comprise the motor 106 with the dual braking system. The dual braking system may comprise an electromagnetic brake and a thruster. The electromagnetic brake and the thruster may help in reduction in delay in submersion or lifting of the testing object and reduction in damage that may be caused while submersion or lifting. Further, the drive shaft 104 may be driven by the motor 106. The motor 106 may comprise such as but are not limited to a Variable Frequency Drive (VFD) motor. The VFD motor may operate from frequencies 5Hz to 50Hz and the speed may be controlled to 143-1430 rpm. The reference of the frequencies and the speed of the VFD motor may be take form the below table:

Sr. No. Notch Frequency (Hz) speed of the motor as per calculation (rpm) actual speed (rpm) Drum rotation (rotation/min) speed (Considering 1.48 mtr. circumference of the Drum)
1 1st 5 143 151 0.9 1.33
2 2nd 12.5 357.5 365 2.25 3.33
3 3rd 25 715 720 4.5 6.66
4 4th 37.5 1072.5 1083 6.75 9.99
5 5th 50 1430 1460 9 13.32

[0021] In one embodiment, a circumference of the drum 114 may be surrounded by the rope 118. Further, the drive shaft 104 may be coupled to the drum 114 through the drive gear 108. The drum 114 may rotate in one direction for facilitating dropping/submerging of the object and the drum 114 may rotate in another direction for facilitating lifting of the object. The object may comprise variety of objects such as but are not limited to a submarine.
[0022] In one embodiment, the brake liner 112 may be attached at extreme corners of the drum 114 and may be connected to the drive shaft 104. Further, upon application of a brake by the dual braking system, the brake liner 112 may get compressed. The compression of the brake liner 112 may provide frictional force to the drum 114 in order to control a rotational speed of the drum 114 which may further facilitate dropping and lifting of the object in a controlled manner.
[0023] In one embodiment, the winch 100 may comprise a frame 110. Further, one or more lifting hook 102 may be mounted on top of the frame 110 for facilitating mounting of the frame 110 on a deck of a ship. The winch 100 may be mounted horizontally on the deck of the ship using the one or more lifting hook 102.
[0024] In one embodiment, the winch 100 may comprise a braking lever 116 for facilitating manual braking. Further, the braking lever 116 may have similar functioning as that of the dual braking system. The braking lever 116 may facilitate application of the brake manually using foot during emergency situations.
[0025] In one embodiment, the winch 100 may facilitate submerging of the object in a deep sea at variable level of depth such as but are not limited to 50 mt., 100 mt., 150 mt., etc. at variable speed.
[0026] In one embodiment, a technical data and quantity of a plurality of components used to design the winch 100 may be mentioned in the table below:
SR. NO. DESCRIPTION TECHNICAL DATA QTY
1 Reduction gear box 1:40 Ratio 01
2 Motor SITI make, 5.5KW, 1430 rpm, 14.18A, Induction motor 01
3 Brass Bush 30x60x70 mm 04
4 Key Material 8 x 10 x 300 mm ( M.S ) 01
5 Nuts and Bolts 1)M16x40 mm. 2) M12x 50mm. 04
6 Lifting Hook 200x75x10 mm 02
7 Angle ( M.S ) 50x50x8 mm 06
8 I – Beam ( M.S ) 75x125x8 mm 02
9 Spring & Brake Liner 3/8 Inch 01
10 M.s plate for foundation 1200x1200x12 mm 01
11 VFD drive ATV312HU55N4,8B,1132409084,5.5KW,7.5HP,380-500V, Schnider make 01
12 Contactors 3TA21,11-0A, Siemens make 01
13 Switches C-25,3 pole MCB 01
14 Cable 4 sqmm x 3.5core, cu cable 01
15 Panel box Powder coated, GI box 01
16 Brake unit Drum size :200 mm Thrustor :18 kg, 3 phase 01
17 M.S Coupling 30x60x80 mm 01
18 Rope clamp 100x40 mm 03

[0027] Now referring to figure 2, which illustrates a top view 200 of a winch 100 to drop an object, in accordance with an embodiment of the present subject matter. The brake liner 112, the drum 114, the rope 118, the motor 106 and the braking lever 116 may be shown in the top view 200 of the winch 100.
[0028] Now referring to figure 3, which illustrates power and control circuit DIG for a winch control panel, in accordance with an embodiment of the present subject matter.
[0029] 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.
[0030] Some embodiment of the winch 100 to drop the object provides enhanced handling capacity during submersion and lifting of the testing object. Since, the winch may be capable to handle the testing object firmly, the damage caused to the testing object during submersion into a deep sea and lifting from the deep sea may be significantly reduced.
[0031] Some embodiment of the winch 100 to drop the object facilitate submerging and lifting of the object inside the deep sea in controlled manner i.e. by controlling speed, braking and position.
[0032] Some embodiment of the winch 100 to drop the object provides a portable winch 100 which may be mounted on any vessel.
[0033] Some embodiment of the winch 100 to drop the object provides easy and controlled submerging and lifting of the object inside the deep sea.
[0034] Although implementations for the winch 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 winch 100.
,CLAIMS:
1. A winch (100) to drop an object, the winch (100) comprising:
a motor (106) connected with a dual braking system, wherein the dual braking system comprises an electromagnetic brake and a thruster;
a drive shaft (104) driven by the motor (106);
a drum (114), wherein a circumference of the drum (114) is surrounded by a rope (118), wherein the drive shaft (104) is coupled to the drum (114) through a drive gear (108), and wherein the drum (114) rotates in one direction for facilitating dropping of an object and rotates in another direction for facilitating lifting of the object; and
a brake liner (112) attached at extreme corners of the drum (114) and is connected to the drive shaft (104),
wherein upon application of a brake by the dual braking system, the brake liner (112) gets compressed; and
wherein the compression of the brake liner (112) provides frictional force to the drum (114) in order to control a rotational speed of the drum (114) and thereby facilitating dropping of the object in a controlled manner.

2. The winch (100) of claim 1, wherein the winch (100) comprises a frame (110).

3. The winch (100) of claim 2, wherein one or more lifting hook (102) is mounted on top of the frame (110) for facilitating mounting of the frame (110) on a deck of a ship.

4. The winch (100) of claim 1, wherein the motor (106) comprises at least a Variable Frequency Drive (VFD) motor.

5. The winch (100) of claim 1, wherein the winch (100) comprises a braking lever (116) for facilitating manual braking.

6. The winch (100) of the claim 5, wherein the braking lever (116) have similar functioning as the dual braking system.

7. The winch (100) of claim 1, wherein the object comprises at least a testing object.