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:
DRILLING JIG FOR ONBOARD DRILLING OF A BOLT

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 Provisional Application No. 201821043282 filed on 16th November, 2018.
TECHNICAL FIELD
[002] The present subject matter described herein generally relates to a portable jig for drilling machine and more specifically it relates to a drilling machine jig for onboard drilling of a bolt.
BACKGROUND
[003] Castle nut and bolts are installed in a thrust block and EPM assembly of a submarine. For locking of castle nut with the bolt a locking pin is inserted through the grooves of the castle nut and through a hole in the bolt. However during installation of equipment the grooves of the castle nut and hole of the bolt may not align to insert the locking pin hence it is a requirement to drill the hole on the bolt after installation of the equipment. Further, it may not be possible to drill the bolts in assembled condition using a drilling machine as the space for drilling the bolts is very limited and confined. Even if the operator tries to drill the holes by holding on a vice in the limited space, it might get slight mismatch at the time of assembling it to its respective position. In the conventional method, after assembling the castle nut with the bolt, marking for hole is done on the bolt. The castle nut is then removed and the hole is drilled on the marked position. In this case there may be mismatch of the hole axis.
[004] Thus, there is a need of an apparatus or device that may help in drilling the holes with precision, reduce time taken to drill for each bolt, reduce man power and man days, and drill bolts at its prior location.
SUMMARY
[005] 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 drilling jig for onboard drilling of a bolt, 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.
[006] The present subject matter discloses a portable jig for a drilling machine to drill holes in a bolt wherein the bolt is configured to be secured in a castle nut. The portable jig comprises a jig plate to secure the drilling machine and the castle nut. The jig plate comprises a side portion configured to receive a tightening bolt. The jig plate further comprises a round bush to receive the castle nut wherein the castle nut is securing the bolt to be drilled. A slot is formed in the jig plate to secure the drilling machine wherein the slot is positioned between the side portion and the round bush. A drilling bit of the drilling machine is aligned with a groove of the castle nut by adjusting the round bush and feed is provided to the drilling machine by rotating the tightening bolt and hence a hole is drilled in the bolt while the bolt is assembled to the castle nut.
[007] It is an object of the present subject matter to drill a hole in a bolt assembled with a castle nut.
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] Figure 1 illustrates a view of a portable jig, in accordance with an embodiment of the present subject matter.
[0010] Figure 2 illustrates another view of a portable jig with a drilling machine, 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 structures and methods 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 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.
[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 discussed above a bolt fastened with a castle nut needs to be drilled onboard after getting marking for the hole to be drilled. However it may not be possible to drill the bolts in assembled condition using a drilling machine as the space for drilling the bolts is very limited and confined. The present subject matter discloses a portable jig to hold a drilling machine to drill hole in the bolt while the bolt is assembled with the castle nut. The portable jig comprises of a jig plate to secure the drilling machine and the castle nut. The jig plate comprises a side portion configured to receive a tightening bolt. The jig plate further comprises a round bush to receive the castle nut wherein the castle nut is securing the bolt to be drilled. A slot is formed in the jig plate to secure the drilling machine wherein the slot is positioned between the side portion and the round bush. A drilling bit of the drilling machine is aligned with a groove of the castle nut by adjusting the round bush and feed is provided to the drilling machine by rotating the tightening bolt and hence a hole is drilled in the bolt while the bolt is assembled to the castle nut.
[0015] Hence the present subject matter provides advantages such as reduced time and less human efforts to drill a hole on a bolt fastened with a castle nut over the conventional method.
[0016] Referring now to figure 1, a portable jig 100 for a drilling machine 102 is shown. The portable jig 100 comprises a jig plate 110. The jig plate 110 comprises a side portion 112, a round bush 118 and a slot 116. The side portion 112 is configured to receive a tightening bolt 114. The round bush 118 holds a castle nut 106 at a desired orientation. A screw 120 is provided on the round bush 118 to lock the orientation of the castle nut 106. In assembled condition a bolt 108 is fastened with the castle nut 106 and the bolt 108 is required to be drilled in that position. The slot 116 is formed in between the side portion 112 and the round bush 118. The drilling machine 102 is secured in the slot 116 as shown in figure 2.
[0017] Now referring to figure 2, the drilled machine 102 secured in the portable jig 100 is shown. The drilling machine 102 is configured to slide to and fro in the slot 116 to drill a hole in the bolt 108. The castle nut 106 is secured in the round bush 118 and the bolt 108 is assembled with the castle nut 106. In the assembled condition a hole is needed to be drilled in the bolt 108 to insert a lock pin. The round bush 118 of the jig plate 110 is rotated to align a groove 106a of the castle nut 106 with a drill bit 104 of the drilling machine 102. The screw 120 may be screwed to fix the orientation of the castle nut 108 with respect to the drill bit 104. The tightening bolt 114 may be operated to provide feed to the drilling machine 102 so as to finish the drilling of hole in the bolt 108. As the tightening bolt 114 is operated, the drilling machine 102 slides in the slot 116 of the jig plate 110. The tightening bolt 114 also provides support to the drilling machine 102 during the drilling operation to prevent vibrations of the drilling machine 102.
[0018] In an embodiment of the present subject matter, the drilling machine 102 is an angular type drilling machine to enable the operation to be performed in a limited and confined space.
[0019] In an embodiment of the present subject matter, the portable jig 100 may be aligned in any orientation based on the position of the castle nut 106.
[0020] In an embodiment of the present subject matter, the drill bit 104 is chosen based on the required size of the hole to be drilled.
[0021] In an embodiment of the present subject matter, the jig plate 110 is made of a metal.
[0022] Exemplary embodiments discussed above may provide certain advantages. Though not required to practice aspects of the disclosure, these advantages may include the following.
[0023] Some embodiments of the subject matter enable the onboard drilling of a bolt with the castle nut and hence reduces a lot of time to perform the drilling operation.
[0024] Some embodiments of the subject matter enable the increased safety of the operator while drilling a hole in the bolt with a castle nut.
[0025] Some embodiments of the subject matter reduce time for drilling of a hole in the bolt with a castle nut.
[0026] Some embodiments of the subject matter reduce fatigue on the operator as by use of present subject matter, as there is no need to mark on the bolt, remove the bolt, drilling a hole at mark on the bolt and then again assembling the bolt with the castle nut.
[0027] Some embodiments of the subject matter minimize the chances of error and produces an accurate hole required on the bolt in the assembled condition.
[0028] Although implementations for the portable jig 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 portable jig 100.
,CLAIMS:1. A portable jig (100) for a drilling machine (102) to drill holes in a bolt (108) wherein the bolt (102) is configured to be secured in a castle nut (106); the portable jig (100) comprises:
a jig plate (110) to secure the drilling machine (102) and the castle nut (106), wherein the jig plate (110) comprises:
a side portion (112) configured to receive a tightening bolt (114),
a round bush (118) to receive the castle nut (106) wherein the castle nut (106) is securing the bolt (108) to be drilled, and
a slot (116) to secure the drilling machine (102) wherein the slot (116) is positioned between the side portion (112) and the round bush (118) wherein
a drill bit (104) of the drilling machine (102) is aligned with a groove (106a) of the castle nut (106) by adjusting the round bush (118) and feed is provided to the drilling machine (102) by rotating the tightening bolt (114).
2. The portable jig (100) as claimed in claim 1, wherein the drilling machine (102) is an angular type drilling machine.

3. The portable jig (100) as claimed in claim 1, wherein the portable jig (100) may be aligned in any orientation based on the position of the castle nut (106).

4. The portable jig (100) as claimed in claim 1, wherein the drill bit (104) is chosen based on the required size of the hole to be drilled.

5. The portable jig (100) as claimed in claim 1, wherein the jig plate (110) is made of a metal.