Title of Invention

TOPI NUT FOR STEEL CHANNEL SLEEPERS ON RAILWAY BRIDGES AND BOLT NUT ARRANGEMENTS

Abstract

The present invention of topi nut relates to anti rotation arrangement of nuts provided on steel channel sleepers on railway I bridges and bolt nut arrangement. This invention relates to an anti rotation arrangement on the existing steel channel sleepers on railway bridges and bolt nut arrangements. The topi nut made up of fabricated metal sheet or molded material with bottom part of the topi nut holding the existing nut and top part of the topi nut surrounding the bolt portion. The top or middle portion is slotted vertically. A split pin is provided through the slot in the top part/middle portion of the to pi nut and bolt hole. The split pin provided will hold the rotation of the top part or middle part of the topi nut by taking reaction from the bolt hole. The top or middle part of the topi nut will prevent the rotation of the bottom part of the topi nut. The bottom part of the topi nut will hold the nut and thus not allow any rotation of the nut or loosening of the entire assembly. ~.-

Full Text

Field of the invention The present invention relates to mechanical engineering field The device is developed to prevent rotation of nuts on steel channel sleepers on railway bridges, prevent loosing of nuts due to vibration in any nut and bolt arrangements and prevent corrosion of bolt and nut contact area by covering the threaded portion of bolt and nut. Indian railways replaced a large quantity of wooden sleepers on bridges due non availability of wooden sleepers .As steel channel sleepers are fitted with 8 sets of bolts and nuts. A large quantity of nuts and bolts are used in channel sleepers, and these fittings are subjected to vibrations due to dynamic loads of wheels of trains Back ground of invention Indian railways replaced a large quantity of wooden sleepers on bridges due to non availability of wooden sleepers and to reduce felling of trees for railway sleepers .As steel channel sleepers are fitted with 8 sets of bolts and nuts for each sleeper. Large quantities of nuts and bolts are used in channel sleepers, and these bolts and nuts are subjected to vibrations due to dynamic loads of wheels of trains. The problem of loosening of nuts is leading to excessive play between the fittings .The play in fittings is further leading to distortion of track parameters and leading to restricting of speed on bridges. The bolts and nuts which are subjected to dynamic conditions are prone for loosing. The existing arrangement of castle nut and bolt with cotter pin doesn't have the provision for providing the split pin at a location where the specific torque is arrived. They have to be rotated upto a maximum of pitch to match with the hole of the bolt. This will lead to excessive tightening or slacking of nut bolt arrangement. The present topi nut arrangement with a groove at diagonal of the hexagonal side and another groove at the centre of the plane surface (Similar arrangement can be made for nuts of different shapes) with split pin will provide and anti rotation arrangement at the location where the specific torque is arrived. This will also provide a cover over the bolt nut arrangement from being damaged by external sources. Summary of Invention The object of the invention is to provide a safety device to nuts so to prevent nuts from being loosened due vibrations. The TOPI NUT provided over the existing nut will prevent the nut from being loosened and prevent all sorts of loosening of fittings of channel sleepers on bridges and there by provide a safe and less maintenance of track on Railway bridges, prevent loosing of nuts in bolt nut arrangements, avoiding rotation of nut to match with the hole of the bolt and castle nut groove thereby giving excessive torque or loosening, and provide a cover over the threaded portion and prevent it from external sources. The TOPI NUT is made up of thin metal sheet, cast material, molded material (for example PVC, HDPV, FRP etc.). This will have five parts 1 the bottom part made up of cylindrical shape having faces same as the number of faces of the nut /double their number suitable to hold the nut and size such that the inner size of the TOPI nut is equal to the outer size of the existing nut 2 middle part of shape convenient to hold the bottom and top parts it is slotted vertically to allow the split pin to pass through the entire cross section in plan of the topi nut in slot in middle part arrangement 3. The top part of the topi nut is also in cylindrical shape and slightly in higher diameter to the bolt and it is slotted vertically to allow the split pin to pass through the entire cross section in plan in slot in top part arrangement .4 A split pin is provided passing through the slotted top portion of topi nut and into the hole of the bolt hole and taken out. 5. A top cover over the top cylindrical portion covering the threaded portion of the bolt. 6 A slot is provided in the top/middle parts The split pin will prevent the rotation of the top/middle portion of the topi nut. The top/middle portion of the topi nut will prevent the rotation of the bottom portion of the topi nut. The bottom portion of topi nut will prevent the rotation of the nut and the top cover will prevent exposure of the threaded portion to external sources. Brief description of drawings. Fig. 1: Elevation of topi nut arrangement with slot in top part Fig. 2: Elevation of topi nut arrangement with slot in middle part Fig. 3: vertical cross section topi nut arrangement with slot in top part Fig 4: vertical cross section topi nut arrangement with slot in middle part Fig 5 Plan of topi nut arrangement with slot in top part Fig 6 Plan of topi nut arrangement with slot in middle part Fig 7 vertical cross section with similar cylindrical top and bottom parts Fig 8 cross section of topi nut Fig 9 elevation of topi nut Detailed description of the illustrative embodiment ITEM NO. DESCRIPTION OF THE PART 1 Top cover 2 Top part 3 Middle part 4 Split pin 5 Bottom part 6 Existing nut 7 Existing bolt 8 Slot in the middle part/top part 1. Top Cover:- The top cover is provided in the top most part of the topi nut for preventing the exposure of the top part of bolt and nut this can be made up of any material.This part is used for removing and fixing the topi nut 2. Top Part:- The top part is made in hallow cylindrical shape in elevation and vertical cross section and of any shape and size in plan. It is made up of any fabricated or molded material. It is provided connecting the top cover and bottom part. This prevents the exposure of the top part of bolt and nut this can be made up of any material. It will also hold the split pin provided in the slots made in it. 3. Middle part:- The middle part is made up of sheet of any fabricated/molded material connecting the top part and bottom part. Slots are made through it of adequate size for holding the split pin. 4. Split pin:- The split pin is made up of any material and provided in the slot of the top/middle part and existing bolt hole. This can be of any shape. The split pin will be holding the top/middle part with bolt hole. 5. Bottom Part:- The bottom part is made in hallow cylindrical shape in elevation and vertical cross section and of any shape in plan. It is made up of any fabricated or molded material. It is provided connecting the middle part. This bottom part will be holding the nut of any shape. The shape of the bottom part will depend upon the shape of the nut. This bottom part will be over the nut. 6. Existing Nut:- The existing nut is made up of any material and any shape as per the design requirement. 7. Existing Bolt:- The existing bolt is made up of any material and any shape as per the design requirement. 8. Slot:- This slot is provided in the top part/middle part as per the design requirement. The shape of the slot can be of any shape depending upon the shape of split pin. Detailed description of the invention :- The invention is aimed at solving the problem of loosing of fittings on channel sleepers on railway bridges and prevent loosing of bolt nut arrangements, avoiding rotation of nut to match with the hole of the bolt and castle nut groove thereby giving excessive torque or loosening, and provide a cover over the threaded portion and prevent it from external sources. As shown in figure 1 the topi nut is made up of metal sheet, cast material, molded material (for example PVC, HDPV, FRP etc.). of adequate thickness (as per the requirement at site which varies with the size of the nut and bolt and to the conditions the bolts and nuts are subjected to . This topi nut arrangement consists of 6 parts. The top, bottom, middle, split pin, slot and top cover. The topi nut is fabricated/molded with sheet or molding material to make one part and split pin is separate. Mechanism of the system The topi nut is provided over the existing nut The inner size of the bottom part of the topi nut is designed to be fit over the outer size of the existing nut up to certain height as per design requirement. The bottom part/middle part of the topi nut will hold the existing nut in its possession. The top part of the topi nut is over the nut surrounding the bolt portion of the nut bolt assembly. The top part of the topi nut posses a slot slotted vertically in slot in top part arrangement. The size and shape of the slot depends on the size of the cotter pin to be provided. The cotter pin is provided through the slot in the top part/middle part of the topi nut and bolt hole already existing in the bolt. The cotter pin will hold the top part/middle part of the topi nut with split pin provided through the bolt. Due to the dynamic vibrations the entire assembly is subjected to vibrations. Due to the vibrations in the assembly the nuts have the tendency to get loose. The top part/bottom part of the topi nut which was locked with split pin through the bolt hole will prevent the rotation/loosening of the existing nut of the channel sleeper assembly with the bottom connected part of the topi nut assembly. Hence, the rotation/loosening of the nuts due to the vibrations of is completely arrested. ADVANTAGES OF THE SYSTEM a) The topi nuts can be provided on the existing fittings easily. b) No assembly of the existing fitting to be removed for providing the topi nut. c) No grooving of the existing nut is required as it is done now for providing the split pin through the nut. d) The failure of galvanization and corrosion of nuts of channel sleepers due to slotting of the already galvanization nut is avoided. e) Topi are provided over the existing nut in as it is condition with out further rotating the nut for matching the hole of bolt with slot I CLAIM 1. A topi nut with anti rotation arrangement for preventing the loosening of nuts in bolt and nut arrangements. This system comprises of top cover (1) top part (2) middle part (3) bottom part (5) split pin (4) and a slot (8). When the topi nut is provided on the existing bolt nut arrangement 6 85 7 the bottom part (5) of the topi nut holds the nut(6). The bottom part (5) is connected to the top part (2) with the connecting middle part (3). The split pin is provided in the slot (8) provided in the top part (2) or middle part (3). When the bolt nut arrangement ( 6 86 7 ) is subjected to vibrations the nut (6) will be having the tendency to loosen. When the nut (6) tries to rotate its rotation will be resisted by the bottom part (5). The bottom part (5) is held in position by middle part (3). The reaction required for holding the bottom part (5) by the middle part (3) is taken from the split pin (4) provided through it or in the top part (2) through the slot (8). When the nut (6) is fitted over the bolt (7) with the torque wrench to the required torque. The bolt hole provided in the bolt will be in the alignment of diagonals or in perpendicular to the face of the topi nut. The topi nut slots(9,10,ll,12) can be aligned either in direction of diagonals of the nut (6) or perpendicular to the face of the nut(6) by pulling it up with the top cover and re-fixing it on the nut. The top cover (1) prevents the exposure of any external contact with bolt nut arrangement. 2. The topi nut as claimed in claim No. 1 is made up of any fabricated Material or molded material. 3. The topi nut as claimed in claim No.l where in the said top cover (1), top part (2), middle part (3), bottom part (5) split pin (4), slot (8) are made up of any fabricated or molded material. 4. The topi nut as claimed in claim No.l wherein the said top cover (1), top part (2), middle part (3), bottom part (5) split pin (4), slot (8) are made up of any shape as per design requirement. 5. The topi nut as claimed in claim No.l wherein the said slot (9,10,11,12) is provided in the middle part(3) or top part (2) as per the design requirement of any shape. 6. Provision of anti rotation arrangement with fabricated metal sheet/molded material covering the over the nut of the existing bolt nut arrangement by holding the nut in its position and preventing the rotation with split pin provided through the bolt in the bolt nut arrangement.

Documents:

2279-CHE-2008 AMENDED CLAIMS 23-07-2014.pdf

2279-CHE-2008 AMENDED PAGES OF SPECIFICATION 23-07-2014.pdf

2279-CHE-2008 CORRESPONDENCE OTHERS. 05-02-2015.pdf

2279-CHE-2008 EXAMINATION REPORT REPLY RECEIVED 23-07-2014.pdf

2279-CHE-2008 EXAMINATION REPORT REPLY RECEIVED 10-04-2014.pdf

2279-CHE-2008 FORM-13 10-04-2014.pdf

2279-CHE-2008 ABSTRACT.pdf

2279-CHE-2008 AMENDED CLAIMS 30-01-2015.pdf

2279-CHE-2008 AMENDED CLAIMS. 10-04-2014.pdf

2279-CHE-2008 AMENDED PAGES OF SPECIFICATION. 10-04-2014.pdf

2279-CHE-2008 CLAIMS.pdf

2279-CHE-2008 CORRESPONDENCE OTHERS 05-12-2014.pdf

2279-CHE-2008 CORRESPONDENCE OTHERS.pdf

2279-CHE-2008 CORRESPONDENCE PO.pdf

2279-CHE-2008 DESCRIPTION (COMPLETE).pdf

2279-CHE-2008 DRAWINGS.pdf

2279-CHE-2008 EXAMINATION REPORT REPLY RECEIVED 30-01-2015.pdf

2279-CHE-2008 FORM-18.pdf

2279-CHE-2008 FORM-9.pdf

2279-che-2008 abstract.pdf

2279-che-2008 description (provisional).pdf

2279-che-2008 drawings.pdf

2279-che-2008 form-1.pdf