Title of Invention | CABLE FASTENER |
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Abstract | A CABLE FASTENER INCLUDES A TUBULAR CASING MOUNTED IN A HOLE ON A BOARD, A LOCK NUT THREADED ONTO ONE END OF THE CASING TOSECURE THE CASING TO THE BOARD, A CLAMP FORMED INTEGRAL WITH ONE END OF THECASING REMOTE FROM THE LOCK NUT, A COLLAR SLEEVED ONTO THE CABLE AND DISPOSED INSIDE THE CLAMP , ABD A CHUCK THREADED ONTO THE CASING TO COMPRESS THE CLAMP AGAINST THE COLLAR AND THE CABLE, CAUSING THE CABLE TO BE POSITIVELY HELD DOWN IN POSITION, WHEREIN THE COLLAR HAS AN ANNULAR GROOVE AROUND THE PERIPHERY, AND THE CLAMP HAS PAWLS AXIALLY ENTENDED FROM ONE END OF THE CASING AROUND THE COLLAR, EACH PAWL HAVING A DOWNWARD ENGAGEMENT PORTION ENGAGED INTO THE ANNULAR GROOVE JOF THE COLLAR AGAINST THE PERIPHERY OF THE CABLE. |
Full Text | BACKGROUND OF THE INVENTION The present invention relates a cable fastener, and more particularly to such a cable fastener for fastening a cable to a machine or a support A cable fastener is a device adapted for fastening to a board or support means to hold a cable or tubular member. U.S. Patent No. 5,927,892, entitled "DEVICE FOR FASTENING A CABLE TO A "BOARD" shows a similar design. This device,/as illustrated in FIG. 1A, comprises a casing 10" having two outer threads at its two opposite ends, a lock nut 11" threaded onto one end of the casing 10" to secure the casing 10" to a board 30", a washer 15" mounted on the casing 10" and stopped between the lock nut 10" and a polygonal outward flange of the casing 10", a clamp 12" mounted on the other end of the casing 10", a collar 13" mounted in the clamp 12", and a chuck 14" threaded onto the casing 10" to compress the clamp 12" and the collar 13", causing the collar 13" to hold down a cable 20" in a hole on the board 30". This cable fastening device is still not satisfactory in function. When fastening up the chuck 14", the pawls 121" of the clamp 12" are radially forced inwards against the periphery of the cable 20", causing the cable 20" to be held down. However, because the pawls 121" are spaced from one another by gaps, the contact between the pawls 121 and the periphery of the cable 20" are of "contact of point" that is insufficient to stop the cable 20" from being twisted or pulled axially. When the cable 20" is twisted or pulled axially with force (see FIG. 1B), the collar 13" may be forced out of position., and water may leak in through the gap between area A" and area B". SUMMARY OF THE INVENTION The present invention has been accomplished to provide a cable fastener, which eliminates the aforesaid problem. According to the present invention, the cable fastener comprises a casing installed in a hole on a board and secured thereto by a lock nut, collar within a clamp, and a chuck tightened to compress the clamp and the collar against the cable being inserted through the casing. The clamp is comprised of a plurality of pawls axially extended from and formed integral with one end of the casing, each pawl having a downward engagement portion that is forced by the chuck into an annular groove around the periphery of the collar BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a sectional view of a device for fastening a cable to a board according to the prior art. FIG. 1B shows the cable twisted and pulled relative to the clamp according to the prior art. FIG. 2 is an exploded view of a cable fastener according to FIG. 3 is a sectional assembly view of the present invention. FIG. 4 is a sectional plain view of the present invention, showing the positioning of the collar between the clamp and the periphery of the cable within the casing. FIG. 5A is a sectional view of the present invention before tightening the chuck. FIG. 5B is a sectional view of the present invention showing the initial stage where the chuck is threaded onto the second outer thread of the casing. FIG. 5C is a sectional view of the present invention showing the chuck tightened up, the collar compressed against the periphery of the cable. FIG. 6 is a schematic drawing showing the clamp compressed, the downward engagement portion of each pawl engaged into the annular groove of the collar according to the present invention. FIG. 7 is a sectional view of the present invention, showing the contact areas between parts of the cable fastener sealed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIGS. 2 and 3, a cable fastener in accordance with the present invention is generally comprised of a casing 10, a lock nut 11, a clamp 12, a collar 13, and a chuck 14. The casing 10 comprises an axial through hole 101 through which a cable 20 is inserted., a first outer thread 103 at a cable input end 105 thereof, a second outer thread 104 at a cable output end 106 thereof, and a polygonal outward flange 102 raised around the periphery in the middle between the first outer thread 103 and the second outer thread 104. The lock nut 11 has a center through hole 111, and an inner thread 112 around the center through hole 111. By means of threading the inner thread 112 of the lock nut 11 onto the second outer thread 104 of the casing 10, the lock nut 11 can be moved axially on the casing 10 through a rotary motion. After the cable output end 106 through a through hole on a board 30, the lock nut 11 is threaded onto the second outer thread 104 to fix the casing 10 to the board 30 (see also FIG. 5A). Further, an annular gasket 15 is mounted on the second outer thread 104 and stopped between the polygonal outward flange 102 of the casing 10 and the board 30 to seal the gap. The annular gasket 15 is preferably made from rubber or plastics, having a protruded sealing rib 151 raised from one side around the center opening thereof. The chuck 14 comprises an axial center hole 141 for the passing of the cable 20, an inner thread 142 for threading onto the first outer thread 103 of the casing 10, and a tapered inside wall portion 61 adapted to compress the clamp 12 inwards. By means of threading the inner thread 142 of the chuck 14 onto the outer thread 103 of the casing 10, the chuck 14 can be moved axially on the casing 10 through a rotary motion. The clamp 12 is axially formed integral with the cable input end 105 of the casing 10, comprising a plurality of axial pawls 121 arranged in parallel. The pawls 121 each comprise a shank 122 axially extended from the cable input end 105 of the casing 10, and a downward engagement portion 123 at the distal end of the shank 122. As shown in FIG. 3, the downward engagement portions 123 of the pawls 121 are tilted in one direction. Further, the pawls 121 define with the cable input end 105 of the casing 10 and annular step 107 around the axial through hole 101 for supporting the collar 13. The collar 13 is a flexible member (made from rubber or flexible plastics) mounted within the clamp 12 and stopped at the annular step 107, having an axial through hole 131 for the passing of the cable 20, and an annular groove 132 around the periphery corresponding to the downward engagement portions 123 of the pawls 121. Referring to FIGS, from 4 through 7, when fastening up the chuck 14, the tapered inside wall portion 143 of the chuck 14 is moved axially with the chick 14 on the casing 10 against the clamp 12, thereby causing the downward engagement portions 123 of the pawls 121 to be forced into engagement with the annular groove 132 of the collar 13, and therefore the collar 13 is inwardly compressed against the periphery of the cable 20. After installation, the cable 20 is positively held down in the casing 10 against external pulling force, and the contact area A between the periphery of the cable 20 and the collar 13, the contact areas A, B, C, D and E between parts of the cable fastener are well sealed. Because the collar 13 is stopped at the annular step 107 and maintained in engagement with the downward engagement portions 123 of the pawls 121, the collar 13 is stopped from movement with the cable 20. While only one embodiment of the present invention has been shown and described, it will be understood that various modifications and changes could be made thereunto without departing from the spirit and scope of the invention disclosed. WE CLAIM: 1. A cable fastener fastened to a board to hold a cable in position, characterised in that the cable fastener comprises; a casing (10) mounted in a hole on said board, said casing comprising an axial through hole (101) through which said cable (20) passes, a first outer thread (103) at a first end (105) thereof, a second outer thread (104) at a second end (106) thereof, and a polygonal outward flange (102) raised around the periphery thereof in the middle between said first outer thread and said second outer thread; a lock nut (11) threaded onto the second outer thread of said casing and stopped at one side of the said board (30) opposite to the polygonal outward flange of said casing; a clamp (12) formed integral with the first end of said casing around the axial through hole of said casing, said clamp comprising a plurality of axial pawls (121) arranged in parallel, said pawls each comprising a shank (122) axially extended from the first end of said casing, and a downward engagement portion (123) at a distal end of said shank; a flexible collar (13) mounted within said clamp around said cable and forced by said clamp to hold down said cable in said casing, and collar having an axial through hole (131), which receives said cable; and a chuck (14) threaded onto the first outer thread of said casing compress said clamp against said collar and the periphery of said cable, said chuck comprising an axial center hole (141), which receives said cable, an inner thread (142) threaded onto the first outer thread of said casing, and a tapered inside wall portion (61) compressed on the pawls of said clamp against said collar and the periphery of said cable. The cable fastener as claimed in claim 1 wherein said clamp define with the first end of said casing an annular step (107) around the axial through hole of said casing for the positioning of one end of said collar. The cable fastener as claimed in claim 1 wherein it comprises an annular gasket (15) mounted on said casing and retained between said board and the polygonal outward flange of said casing. The cable fastener as claimed in claim 3 wherein said annular gasket comprises a protruded sealing rib (151) raised from one side thereof and stopped against the polygonal outward flange of said casing. The cable fastener as claimed in claim 1 wherein said collar comprises an annular groove (132) around the periphery thereof adapted to receive the downward engagement portion of each pawl (121) of said clamp. The cable fastener as claimed in claim 1 wherein said collar is made from rubber. The cable fastener as claimed in claim 1 wherein said collar is made from flexible plastics. A cable fastener includes a tubular casing mounted in a hole on a board, a lock nut threaded onto one end of the casing to secure the casing to the board, a clamp formed integral with one end of the casing remote from the lock nut, a collar sleeved onto the cable and disposed inside the clamp, and a chuck threaded onto the casing to compress the clamp against the collar and the cable, causing the cable to be positively held down in position, wherein the collar has an annular groove around the periphery, and the clamp has pawls axially extended from one end of the casing around the collar, each pawl having a downward engagement portion engaged into the annular groove of the collar against the periphery of the cable. |
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00366-cal-2000-correspondence.pdf
00366-cal-2000-description (complete).pdf
00366-cal-2000-letter patent.pdf
Patent Number | 211057 | ||||||||
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Indian Patent Application Number | 366/CAL/2000 | ||||||||
PG Journal Number | 42/2007 | ||||||||
Publication Date | 19-Oct-2007 | ||||||||
Grant Date | 16-Oct-2007 | ||||||||
Date of Filing | 27-Jun-2000 | ||||||||
Name of Patentee | AVC INDUSTRIAL CORP. | ||||||||
Applicant Address | NO. 122, WU KUNG ROAD, WU KU HSIAN, TAIPEI HSIEN, TAIWAN 248, CHINA. | ||||||||
Inventors:
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PCT International Classification Number | F16L 5/00 | ||||||||
PCT International Application Number | N/A | ||||||||
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PCT Conventions:
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