Патент USA US2115592код для вставки
April 26, 1938. S. R. SMITH ' 2,115,592 ELECTRIC FUSE DEVICE Filed Nov. 1, 1935 2 Sheets-Sheet l M M3 i V_ V Fig. (3. Inventor: Sidney R. 5mit h, 6? SW is Attorney. ' April 26, 1938. s. R. SMITH 2,1 15,592 ELECTRIC FUSE DEVICE Filed Nov. 1 2 Sheets-Sheet 2 ! m ug Invent or‘: Sidneg R. Smith, b3 ?lm/755W His Attorn eg 2,115,592 Patented Apr. 26, 1938 UNITED STATES PATENT OFFICE 2,115,592 , ELECTRIC FUSE DEVICE Sidney R. Smith, Lenox, Mass., assignor to Gen eral Electric Company, a corporation of New York Application November 1, 1935, Serial No. 47,768 20 Claims. (Cl. 200-1155) The present invention relates to fuse devices and has for a principal object the provision of improvements in the construction of fuse devices particularly adapted to be mounted directly on 5 the overhead line wires of a secondary electrical of mounting the device of Fig. 8 upon an electric line conductor; distribution system. ‘ Other important objects of the invention are the provision of improved fuse devices of the type above referred to having low initial cost 10 .and low upkeep cost and which provide protection of the fuse link and other operating parts from the weather to thereby reduce maintenance care and insure efficiency and reliability of operation under all conditions; which give positive and 15 clearly observable indication of fuse operation; Fig. 13 is a sectional elevation of a third form of fuse device, constructed in accordance with the present invention, and Fig. 14 is a partially 5 cut away view of the device showing the parts‘ after rupture of the fusible element; Fig. 15 shows the détails of an improved form of clamp ing means for securing the fuse device of Fig. 13 to a line conductor, and Fig. 16 illustrates dia grammatically the manner of mounting the de vice of Fig. 13 on a line conductor, while Fig. 1'7 illustrates a modi?ed form of clamping device for securing the fuse device of Fig. 8 on a line con ductor. 15 Referring to Fig. 1 of the drawings, 20 desig which are safe and easily accessible for re-fusing n'ates a block or box of suitable insulating mate with provision for automatic protection of the rial formed in two parts 2| and 22 which parts lineman whose duty it is to service the line equip ment, and which permit ready and quick installa are formed with recesses cooperating to provide , an explosion chamber 23 within the interior of 20 20 tion thereof in almost any kind of secondary dis tribution system and facilitate the safe intercon necting of transformer secondaries in electrical the block. The two parts of the block are secured in assembled relation in any suitable manner as, for example, by means of bolts 24 passing through networks. Other objects of the invention and the manner 25 in which the invention is carried out will become apparent from the fo1l0wing..description taken in conjunction with the accompanying drawings aligned openings in the parts and fastened in place by means of nuts 25. The block is provided 25 with aligned passages 26 and 26' extending out wardly through the component parts thereof from the explosion chamber 23 to the opposite faces of the block. The opposite faces of the block are provided 30 in which Fig.'l is a sectional elevation of one form of fuse device, constructed in accordance ' 30 with the ,present invention, showing the parts in the positions they assume when the fusible ele ment is intact; Fig. 2 is aside elevation of the' device showing the parts after rupture of the fusible element, and Fig. 3 is a front elevation 35 of the device; Figs. 4 and 5 illustrate details of an improved form of fuse contact clamping de vice; Fig. 6 shows in detail the parts of an improved clamping device for securing a fuse device to an 40 electrical line conductor; Fig. '7 illustrates diagrammatically the manner of mounting the device of Fig. 1 on a line con ductor; 45 . Fig. 8 shows a second form of fuse device, con structed in accordance with the present inven tion, with the parts thereof in the positions they assume when the fusible element is intact; Fig. 9 is a view partially cut away and partially in section of the same device showing the parts after rupture of the fusible element; Fig. 10 illustrates a section taken along the line Ill-l0 of Fig. 9, and Fig. 11 illustrates a section taken along the line H-Il of Fig. 9; 55 Fig. 12 illustrates diagrammatically the manner with recesses 21 and 21’ in the upper portions of which are secured, by means of screws/2H ;the mounting plates 29 and 29' which are so fo'_' ed as ,to project outwardly from the recesses as illus trated and to turn up substantially parallel with 35 the opposite faces of the block to provide flanges 30 and 30'. Also disposed one in each of the recesses 21 and 21' are plate members 3| and 3|’ respectively which are hingedly mounted on the mounting plates 29 and 29' as indicated at 32 40 and 32’. These plates are arranged to abut tight ly against the bottoms of the recesses and are biased outwardly to the positions shown in Fig. 2 by means of springs 33 and 33’ each of which has one end secured to its corresponding hinged 45 plate and its other end secured to its correspond ing mounting plate as shown. On the hinged plates 3| and 3|’ are mounted improved fuse contact clamping devices desig nated generally in Fig. 1 by the numeral 34. The 50 details of. one of these devices are shown in Figs. 4 and 5. It is to be understood that the two de vices are the same in construction and hence the same numerals will be used hereinafter to designate like parts of each. Each of these 55 2 2,115,592 clamping devices comprises a cylindrical boss 35 ?xedly mounted in an opening 36 in the plate 3|, or 3|’ as the case may be, in any suitable manner as by means of the riveted connection indicated at 31, and an annular member 38, which is mounted on the boss 35 for coaxial rotation there about. Boss 35 is provided with a longitudinal opening 39 eccentric of the axis of the boss and is provided also with an annular recess 40 adja cent the point of connection of the boss to the plate 3 l. Member 38 has an internally projecting ?ange 4| arranged to move in the recess 49, the inner rim of the ?ange being eccentric to the axis of rotation of member 38, with portions of the 15 rim, such as those designated 42, having a greater radial distance than other portions such as that designated at 43. The recess 48 is so‘formed over a portion of the extent thereof that it in tersects or opens into the passage 39 and hence 20 the eccentric rim 4| of member 38 projects into 10 springs 33 and 33' to maintain the plates 3| and 3|’ in their innermost positions. In order to mount the fuse device upon an elec tric line conductor, an improved removable clamping means is provided which is designated generally in Fig. 1 by the numeral 48, the details of the clamping means being shown in the ex— ploded view of Fig. 6. As will be seen from Fig. 6, the clamping means consists essentially of a supporting plate 50, a resilient plate 5|, a clamp 10 ing plate 52, guide means for maintaining the three plates in proper assembled relation and screw means for drawing the clamping plate and the supporting plate together. Supporting plate '59 is provided with openings 53 for receiving 15 screws 54 which serve to fasten the plate ?rmly to the ?ange 30' of the mounting plate 29’ se cured to the block 29. Plate 52 is formed with a. bent over ?ange or U-shaped portion 55 which is the passage 39 to varying degrees in accordance arranged to ?t over the edge 56 of a curved por~ 20 with the distance of the rim portion from the . tion 57 of the supporting plate 50 to thereby pro axis of rotation. Plate 3! and the riveted over vide a hinged connection between the two plates._ portion 31 of the boss 35 have an opening 44 Plate 5| is formed to ?t between the plates 50 25 formed therein in substantial alignment with the and 52 and is provided with a bent over ?ange passage 39. portion similar to that of plate 52 and having a 25 In order to clamp a wire or like tubular element projection 58 adapted to extend between the to the plate 3i by means of the clamping device curved portion 51 of plate 50 and the plate 52 34, member 38 is turned to such position that the and having also projections 59 which extend be 30 rim portion 42 thereof is in proximity with the tween the curved portion 51 and the downwardly opening 44. This rim portion, which has the projecting portion of the bent over ?ange 55. 30 greater radius, does not project into the passage This resilient plate 5| acts to swing the plate 39 and the wire may therefore be inserted into 52 outwardly away from the plate 50 about the hinged connection. An eyebolt 69 is provided for the opening 44 and the passage 39 without ob drawing the plates 59 and 52 together in oppo 35 struction being offered thereto. The member 38 is then rotated on the boss 35 to cause the lesser sition to the action of the resilient plate 5|. This 35 bolt has a bearing ?ange 6|, which abuts against radius ?ange portion 43 to project into the pas sage 39 and the wire is- clamped thereby between the outer face of plate 52, and a threaded por~ the rim of the ?anged portion and. the opposite tion 62 which extends through openings in the 40 wall of the passage 39. In order to effect an even two plates 50 and 52 into engagement with a more e?icient clamping connection, the rim of screw threaded nut 63 secured in any suitable 40 the ?ange may be slightly sharpened to enhance manner to the outer face of plate 50. The two plates 50 and 52 are provided with depressions 84 its grip upon the surface of the wire. With the apparatus previously described, the and 65 respectively which cooperate to receive 45 mounting of the common types of fuse link in a wire as shown in Fig. 1, and plate 52 is pro the block 20 becomes a very simple matter. The vided with a portion 66 which is bent outwardly fuse link is inserted through one of the passages to aid in guiding the wire into the recesses 64 26 or 26' and is so located that its fusible portion and 65. Plate 52 is provided with two projecting 45 is disposed within the explosion chamber 23.‘ pins 61 and 68 which are arranged to extend into 50 The fuse link may or may not be provided with openings 69 and 10 respectively provided in the plate 50 to thereby maintain the plates in properly’ I’ a strain wire 46 as found desirable. The connec assembled relation. The clamping means just tion shanks or contacts 41 of the fuse link pro trude outwardly through the passages 26 and 26' described serves not only as a supporting means for the fuse device but also provides electrical for engagement by the clamping devices 34 car 55 ried by the plates 3| and 3|’. Members 38, which connection between the wire engaged thereby and the flange 30' of plate 29' preferably are knurled, of the clamping devices, are turned as previously described to such posi tions that when the hinged plates are pressed into which is in electrical . conductive relation with the fuse contact clamp ing device 34. abutting engagement with the faces of the block Other clamping means are mounted on the block 20 for securing an electric lead Wire or line 44 into the passages 39 of the clamping devices; Members 38 then are rotated to bring the rim portions 43 thereof into engagement with the shanks to thereby effect a secure clamping en 65 gagement thereof. It will be seen that with the arrangement just described the fusible portion 45 and the end conductor thereto in conductive relation with the other fuse contact clamping device 34, and com prise a U-shaped member ‘H the two legs of which are adapted to be fastened onto the block 20, one disposed on each side of the ?ange 30 of the sup porting plate 29, and to be held in place by means 60 20. the shanks 47 project through the openings of screw 12 and lock washers 13. A screw 14 in stantially completely enclosed within the cham threaded engagement with an opening in the U-shaped member serves to rigidly clamp a. feed wire or line conductor within the closed portion tively protected from all weather conditions, the of the U-shaped member as shown. shanks or contacts 41' of the fuse link are sub 70 ber 23 and the passages 26 so that they are effec inner surfaces of the plates 3| and 3|’ serving to eifectively close the outer ends of the passages 26 and 26’_respectively. The tensioned fuse link 75 acts in opposition to the biasing force Of the ' In an electrical distribution system the fuse device previously described is adapted to be mounted upon a line conductor and either con nected across a strain insulator or used with or without an insulator in conjunction with a rack 75 3 2,1“,592 As will be understood from the preceding de or cross arm assembly. Fig. '1 shows, for ex ample, the manner in which the device may be scription, re-fusing of the device may be accom connected across a strain insulator, designated by the numeral 16, to which are connected the line conductors 11 and 18. Before the fuse de lead wire or bared conductor end 11' from the clamp 1i and then unscrewing the clamping means 48 whereupon the fuse device may be lifted from the supporting line conductor and may be vice is mounted upon the line conductor, a fuse plished readily and quickly by ?rst removing the link is installed therein in the manner illustrated in Fig. l with the clamping devices 34 securely engaging the ends of the link so that plates 3| 10 and 3!’ are held in their inward positions. Also, eyebolt 60 of the clamping means 48 is screwed conveniently re-fused without danger to the line man. outwardly so that the clamping means may be slipped easily over a bared section 18' of the line The second embodiment of improved fuse de 10 vice illustrated in Figs. 8 to 11 inclusive consists essentially of a short fuse tube 80 of suitable in sulation material having a two-part terminal cap 8| mounted on the upper end thereof and a conductor 18, the curved portion 66 of the clamp 15 ing plate 52 serving as previously outlined to guide the conductor into the recesses 64 and 65 of the plates 50 and 52 respectively. During the mounting operation the fuse device may be sup combination electric lead and fuse terminal 15 clamping cap 82 connected to the other end thereof by means of an insulating tube or casing 83. The lower end of the tube 80 is telescoped within and longitudinally slidable with respect ported in any suitable manner as by means of a to the upper end of the casing 83 as more clearly 20 20 switch stick the end of which is inserted through the eyelet of eyebolt 60. When the fuse device has been mounted upon the line conductor, bolt 60 is turned to draw the plates 50 and 52 together and thereby effect ayrigid and non-movable en 25 gagement of the clamping means with the. bared section 18’ of the line conductor, one end of the fuse link thus being electrically connected to the shown in Fig. 9. A coil spring 84, surrounding the tube 80 and having its lower end seated in a recess 85 of the casing 83 and its upper end in abutting engagement with the lower surface of the terminal cap 8|, serves to bias the two tubes 25 supporting line conductor 18 through the right apart into extended positions while pins or screws 86, mounted on the outer surface of the tube 80 and movable in slots 81 formed in the inner sur face of the tubular casing 83, serve to limit the hand (as viewed in 'Fig. 1) clamping device 34, 30 hinged plate 3|’, mounting plate 29', and sup porting plate 50. As a final operation, the end 11', previously bared, of the line conductor 11 is inserted through the opening in the U-shaped member 1| and tightly clamped in position by 35 means of screw 14 thus providing electrical con nection from line conductor 11 through clamping member 1|, mounting plate 29, hinged plate 3|, relative movement between the telescoped tubes. 30 These screws 86 and cooperating slots 81 also serve to prevent relative rotation of the tubes about their common axis. Terminal cap 8| serves not only as a fuse con tact but also as a means for supporting the fuse 35 device on an electric line conductor. To this end, it is provided with an inner cap 90 screwed onto the upper end of the tube 80 and having an outer and the left hand clamping device 84 to the other end of the fuse link. The sequential mounting 40 operation just outlined is made possible by the improved arrangement of the parts of the fuse device and mounting means therefor and is an important safety feature giving added protection 45 to a lineman either installing the device for the ?rst time or re-fusing the device after operation thereof. In operation, blowing of the fuse link results in the formation of an arc and the production of gases in the explosion chamber 23 which cre ates a pressure in the chamber tending to blow screw threaded portion for removable connection to an inner screw threaded portion of a sup 40 porting cap 9|. A lock washer 92 is provided for insuring a tight connection between the inner cap 80 and the end of the fuse tube 80 while the cap 90 has a centrally disposed opening for the accommodation of the shank 93 of a button head 45 type fuse link, the button head 94 of which is clamped between the caps 90 and Hi. It is to be understood that, with slight modi?cation well 26’. The result is that the plates or doors 3| and iii’ are blown outwardly to effect separation of the fuse shanks or contacts 41. Springs 33 55 and 33’ aid in this outward movement of the within the range of mechanical skill, the fuse device may be adapted for other well known 50 forms of fuse links. On the upper end mounted a clamping device for securing the fuse device to a line conductor. A preferred form of such clamping device is illustrated in Figs. 8 and 55 9 and comprises a stud member 95 extending up their outward positions after rupture of the fuse link to give a positive and clearly observable in dication of the operation of the device. Collec tion of ice, sleet and other undesirable foreign 60 matter upon the working parts of the fuse device slot 96 for the reception of an electrical conduc tor as illustrated. In order to hold the conduc tor in the slot 96, the outer surface of the stud 60 is provided with a screw threaded portion for engagement with a clamping nut 98 which upon 50 the gases outwardly through the passages 28 and doors and also serve to maintain the doors in in a manner to impair the emciency and de pendability of operation thereof is prevented by the substantially complete enclosure of the fuse link within the chamber 23 and the passages 26 65 and 26', by the closing of the ends of the passages by means of the plates 3| and BI’ and by the mounting of the plates in such manner that they normally repose in the bottoms of the recesses 21' and 21' respectively in the opposite faces of ' the 70 block or casing 20. Furthermore, the two clamp ing devices 48 and 1| provide under all weather conditions effective means for electrically con necting the fuse contacts to the respective line 75 conductors. ' wardly from the cap SI and having a transverse being screwed downwardly presses against the metal clip 99 and effects a tight clamping engage ment upon the conductor. , An alternative form of clamping means is illus— trated in Fig. 1'7. In this case the outer sup porting cap I80 cf the two-part terminal cap mounted on the end of tube 88 is formed with an arm IOI extending outwardly at one side 70 thereof substantially at right angles to the tube and a downwardly curved guide portion I02 ex tending outwardly at the other side thereof. This guide portion curves inwardly to a depres sion I03 which is provided adjacent the button 75 4 2,115,592 cap 94 of the fuse link for the accommodation of a line conductor in engagement with the but ton cap. At the outer end of the arm IN is hingedly mounted a clamping arm I04 arranged to extend in substantially parallel relation with the arm IM and having a recess I05 for coopera tion with the recess I03 of the cap I00 to clamp the conductor therebetween and having also an upwardly curved portion I06 for cooperation with 10 the curved portion I102 to guide the conductor into the recesses. In order to securely clamp a conductor, such as that indicated at ill, in the recesses I03 and I05, an internally threaded wing nut I 01 is rotatably mounted in an opening I00 15 in theclamping arm I04 and is arranged to en gage a screw threaded element I09 pivotally cap type. is inserted into the fuse tube 80 through the opening provided in the terminal cap 80 and, with the tubes 80 and 83 compressed, the lower end or extension H4 of the fuse link is clamped in the central opening H3 of the lower terminal cap 82 by means of the clamping screw II'I so that the tubes are maintained in contracted telescoped relationship in opposition to the biasing force of the coil spring 84. The fuse device is then ready to be connected to the supporting cap Si or I00, as the case may be, by screwing the cap 90 into the supporting cap as previously outlined. The bared end I28’ of the other line conductor I28 is then inserted into the slot I22 of the lower cap 82 and securely clamped in place by means of the metal clip I24 mounted on the arm IOI as indicated at H0. Tubular casing 83, of the device illustrated in and the clamping nut I25. An important fea Figs. 8 and 9, has formed thereon an annular ture of this last described device is that, due to 20 flange or skirt ill for preventing electrical the prevention of relative rotation between the creepage and has mounted on the lower end' tubes 00 and 83 and due to the slotted construc thereof the clamping terminal cap 82 which is tion of the stud i2I, it is impossible to screw the secured in place by means of screws H2 which upper terminal cap 00 of the fuse tube 80 into extend through openings in the terminal cap the supporting cap mounted on the supporting 25 and into openings provided in the wall of the line conductor if the other line conductor has casing 83 as clearly illustrated in Fig. 10. This previously been clamped to the lower terminal 13 U! lower terminal cap has a centrally located open- - cap 82. Added safety to the lineman installing ing II3 in alignment with the passages in the the fuse device is thereby insured in that the ?nal act of the installing operation is necessarily tubes 00 and 83 for the reception} of an exten 30 sion H4 of a fuse link extending through the the simple insertion of the lead wire or conduc telescoped tubes. When the fusible portion H5, tor end I28’ into the lower terminal clamping 30 and the strain wire II6 if such be provided, of means and the danger of coming in contact with both of the terminals of a live fuse element is the fuse link are intact and the tubes 80 and 83 thereby avoided. are in contracted telescoped relationship, the 35 extension II4 of the fuse link extends into the opening H3 where it is securely fastened by The advantages of the fuse device just de scribed are similar to those pointed out in con- . means of clamping screw II‘! which is mounted nection with the embodiment ?rst described in in a screw threaded opening H8 extending . that the fuse link is at all times enclosed within through the sides of the cap 82 as shown in Fig. a chamber formed in the interior of the telescoped 40 11. An observation opening H9 also is formed tubular members and is therefore protected from all sorts of weather conditions. Furthermore, in the terminal cap at right angles to the open ing H8 to facilitate the clamping of the fuse danger of non-operation of the fuse device due extension. The terminal cap has also exhaust to formation of ice or sleet coating on the opera ports I20 in communication with the interior of 45 the casing 83 for the release of gases therefrom upon the blowing of the fusible element. A clamping stud member I 2I, similar to that ‘provided on the upper supporting cap 9|, is formed on the lower cap 82 and has a trans 60 verse slot I22 for the reception of a wire con ductor and a metallic clip I24. The stud is ex ternally screw threaded to provide for the screw ing thereon of a clamping nut I25. The installation of the fuse device illustrated 65 in Figs. 8 and 9 is similar to that of the ?rst embodiment~previously described and similarly it may be either connected across a strain insu~ lator or mounted with or without an insulator 'in a rack or crossarm assembly in a distribution 60 system. In the mounting of the device in the manner illustrated in Fig. 12, the supporting cap 9| -or the supporting cap I00, as the case may be, is ?rst unscrewed from the terminal cap 80 and is then secured to the bared portion I26’ of a line conductor I26 which is fastened at its end to a strain insulator I21. It will be seen that the clamping means illustrated in ‘Figs. 9 and 17 both are effective when properly clamped to prevent rotation of their associated supporting 70 caps about their longitudinal axes. If desired, however, the clamping means may be made ro tatable with respect to the supporting cap, but the rigid construction is usually to be preferred. A fuse link, which may be of any suitable form and which is illustrated as being of the button tive parts is guarded against by the abutting engagement of the upper terminal cap BI with the upper end of the casing 83 when the fuse link 45 is intact, which engagement insures substantially complete enclosure of the inner slidable fuse tube 80 and the biasing spring 84. A positive indication is also given upon rupture of the fuse link by the springing apart of the telescoped 50 tubes into their extended relationship. If de sired, the outer surface I29 of the fuse tube 80, which is exposed upon operation of the fuse de vice, may be painted red or some other bright color to accentuate and make more readily ob servable from the ground the indication of the fuse rupture. E?icient operation of the fuse de vice is insured in that the explosive force of the gases given off in the interior of the tube and the forcing apart of the fuse terminals by the 80 spring facilitates the quenching of the arc formed upon rupture of the fuse element, and the ex~ haust ports I20 in the lower terminal cap serve to relieve the pressure within the tubes and pre- . vent rupture thereof. A third form of improved fuse device embodying 65 the present invention is ‘illustrated in Figs. 13 and 14 and comprises a fuse tube I30, of suitable insulation material, having a metallic terminal member I3I screwed into one end thereof and a mounting device secured adjacent the other end 70 thereof. Terminal member I3I is in the form of an elongated hollow metallic tube arranged to receive in one end thereof the lower end I32 of a fuse link extending through the tube I30. A75 5 2,115,592 clamping screw I33 extending through a thread ed opening in the side wall of the terminal mem ber is provided for clamping the end of the fuse link against the inner side wall of the terminal member. The outer end of the terminal member is formed to permit a plug and sleeve connection ' to an electric lead wire and to that end has a central bore I34 for the accommodation of a bifurcated plug I35, which plug has a bore I36 in the end thereof for the accommodation of a line conductor or electric lead wire. The plug is se cured to the terminal member‘by means of a screw I31 extending through an opening in the side wall of thcbore I34 and into engagement with the plug while the conductor or lead wire is 15 secured in the bore I36 of the plug by means of screws I38. ' The other end of the fuse tube I30 is provided with a terminal cap I40 having a central bore I“ for the accommodation of‘ the other end I42 of 20 the fuse link and has a clamping screw I43 ex tending through an opening in the wall of the bore for clamping the end of the fuse link therein. Terminal cap I40 has also an annular ?ange por tion I44 which ?ts over the end of the tube I30 and cooperates with the body of the terminal'cap for substantially closing the end of‘ the fuse tube, the bore I4I being restricted by the end of the fuse link and the end of the clamping‘ screw project 30 ing thereinto. Referring to Fig. 15, I45 designates a U-shaped. supporting member, the legs of which are pro vided with inner facing concave portions I46 and I41 which cooperate to engage the outer sur face of the fuse tube I30. These curved portions 35 are clamped tightly upon the fuse tube by means of a bolt I48 extending through openings in the ends of the legs of the U-shaped member and having a clamping nut I40 threadedly engaging the end thereof. One or both of the curved 40 portions I46 and I41 may be provided, if desired, with an internal projection I50 which engages a depression formed in the outer surface of the fuse tube to thereby prevent rotation of the fuse in the supporting member. 45 tube Slidably mounted on the outer end of the sup porting member I45 is a U-shaped clamp I5l having one leg I52 thereof, which is longer than the other leg I53, held in slidable engagement with the supporting member I45 by means of a 50 guide ring I54 surrounding the leg‘ I52 and a portion of the member I45. A wing screw I55 out the mounting operation, a fuse link is inserted into the open end of the fuse tube I30, the plug I35 having been previously removed from the bore I34 of the terminal I3I and the terminal cap I40 being in the position illustrated in Fig. 14. The lower end I32 of the fuse link is securely clamped in the central bore of the terminal I3I by means of the clamping screw I33. Terminal cap I40 is then bent downwardly into closing relation with ‘the end of the tube I30 and the other end I42 10 of the fuse link is secured in the terminal cap by means of clamping screw I43. The assembled fuse device can then be mounted upon the line conductor I63 with the bared portion I63’ of the line conductor extending between the U-shaped 15 supporting member I45 and the U-shaped clamp ing member I5I, the wing screw I55 being turned until the conductor is securely clamped between the U-shaped members. Connection plug I35 withthe bared end I64’ of the other line con 20 ductor I64 connected thereto is then inserted into the socket or bore I34 of the terminal mem ber I3I and‘ the fuse device is in condition for service. Upon rupture of the fuse element the combined action of the spring strip I60 and the 25 gases generated within the tube I30 causes the terminal cap I40 to move rapidly outwardly to the position shown in Fig. 14 to thereby increase the distance between the fuse terminals and fa cilitates the extinguishing of the arc therebe 30 tween. _ The advantages of the last described fuse device construction are similar to those attendant upon the use of the two previously described embodi ments ,in that the device is simple and easy to 35 manufacture, may be installed and serviced with ease and safety, is e?icient and reliable in opera tion under all weather conditions due to substan tially complete enclosure of'the fuse link within the enclosed chamber, and gives a positive indi 40 cation clearly observable from the ground of fuse operation. What I claim as new and desire to secure by Letters Patent in the United States is: ' 1. A fuse device of the enclosed type adapted 45 to be suspended from an electric line conductor and including in combination an, insulating cas ing having a passage extending therethrough and a pair of terminal members one at each end of the passage for supporting a fuse element in the 50 passage, one of said members being arranged to substantially close the end of the passage adja cent thereto and having mounting means in extending through aligned openings I56 and I51 cluding a resilient element operative to move said in the ends of the U-shaped members‘ I5I and one element outwardly to an indicating position 55 I45 respectively, engages a clamping nut I50 dis ~upon rupture of said fuse element, means for 55 posed interiorly of the member I45, and serves electrically connecting said terminal members to clamp an electric conductor between the ends respectively to said line conductor and to a sec of the two U~shaped members as shown. ond electrical conductor and means for mount Rigidly clamped between the end of the mem ing the casing on the line conductor including a ber I45 and the clamping nut I50 supported there clamping device removably engageable with the 60 by are the ends of a metallic spring strip I60 conductor. and a metallic conducting strip I6I the other ends line 2. A fuse device adapted to be supported by an of which strips are secured to theterminal cap electric line wire and including in combination I40 as indicated in Fig. 13. Spring strip I60 is an insulating casing formed to substantially com 65 operative to bias the terminal cap from its closing pletely enclose a fuse element with the ends of 65 position shown in Fig. 13 to its outward position the element projecting outwardly through open shown in Fig. 14 and conducting strip I6I serves ings in opposite sides of the casing, a pair of to electrically connect the terminal cap I40 with outwardly biased spring actuated fuse contact the supporting clamping means and the line con clamping devices hingedly mounted one on each 70 of said opposite sides of the casing and each ar 70 ductor. In Fig. 16 is illustrated diagrammatically the ranged to engage a protruding end of said fuse manner of connecting the fuse device last de element, means carried by said casing for remov scribed across a strain insulator I62 to which are ably mounting the casing on an electric line wire connected the line conductors I63 and I64 of an and for providing electric connection between 15 overhead distribution system. In order to carry 75 6 2,115,592 the line wire and one of said contact members, and other means carried by said casing for en gaging an electric lead wire and for providing electrical connection between said lead wire and the other one of said contact devices. 10 . 3. A fuse device adapted to be suspended from an electric line wire including in combination a block of insulation material having a recess in the interior thereof to provide an explosion chamber and having passages extending outwardly from said chamber to two opposite faces of the block, a pair of outwardly biased spring actuated metallic ing bolt extending through said plates at a point intermediate the said hingedly connected edges and the said jaw portions thereof for drawing the plates together against the action of said resilient element, and means carried by one of the plates provided for fastening the same to the device to be mounted. 7. Clamping means for removable mounting purposes including in combination a plate adapt ed to be secured to a device to be mounted and having an outwardly projecting edge portion, a 10 plate members hingedly mounted one on each of. second plate having a bent over ?anged portion ,arranged to ?t over said edge portion to provide said opposite faces of the block and each ar 15 ranged when in inward position to substantially close the outer end of one of said passages, fuse contact clamping means carried by each of said plates for engaging an end of a fuse link disposed in said chamber with its ends projecting outward 20 ly through said passages, means for supporting said block on an electric line wire including a clamping device removably engageable with the line wire and mounted on the block in conductive relation to one of said plates, and other clamp 25 ing means mounted on said block in conductive relation to the other of said plates for electrical ly connecting a second electrical conducting wire thereto. 30 . 4. In a clamping device for engaging a wire or like tubular element, a pair of members mount ed in substantially abutting relation and rela tively rotatable about a common axis, each of said members having an opening therein eccentric with respect to said axis and said openings be ing so disposed with relation to each other that when said members are in certain relative posi tions the openings provide a passage for the loose accommodation of said aforementioned tu bular element and that when said members are 40 in certain other relative positions portions of the rims of the openings cooperate to clamp said 35 tubular element tightly therebetween. 5. In a clamping device for engaging a wire or like tubular element, a substantially cylindrical 45 member having a passage extending longitudinal ly therethrough eccentric with respect to the axis of the member, said member having also an an nular recess formed in the outer surface there of with the recess for a portion of the extent 50 thereof opening into said passage, and an annu lar member mounted on said ?rst member for rotation thereabout and having an inwardly pro jecting ?ange movable in said recess, the inner rim of said ?ange being eccentric with respect to 55 the axis of said members and being arranged when said second member is rotated into prede 60 termined positions with respect to said ?rst mem ber to project into said passage to cooperate with the wall of the passage for tightly clamping such aforementioned tubular element therein. 6. Means for removably mounting an electric device on a line wire or the like comprising a pair of substantially ?at plates arranged in side by side relationship with one of the plates hingedly 65 connected along one of its edges to the corre sponding edge of the other of the plates, said plates having formed therein at a distance from the said hingedly connected edges thereof jaw portions arranged to engage a line wire or the 70 like, at least one of said plates having formed a hinge connection between the plates when they are disposed in side by side relationship, said plates having cooperating guide means for main taining them in properly assembled side by side ' relationship and having also cooperating jaw por tions for engaging a supporting member, a re silient member formed to ?t over the said edge 20 portion of said ?rst plate and beneath the bent over ?anged portion of said second plate and op erative to swing said second plate away from said ?rst plate about said hinged connection and screw means operatively engaging said plates for adjustably drawing the same together to clamp said supporting member therebetween. 8. A fuse -device including in combination a pair of tubular members at least partially tele scoped one within the other and longitudinally 30 slidable with respect to each other, a pair of ter minals carried one by each of said members, each of the terminals having means for anchoring one end of a fuse link which extends through said members and serves to maintain the members in 35 contracted telescoped relationship by the tension of the fuse link, means for effecting longitudinal ly outward movement of at least one of said members with respect to the other upon rupture of a. fuse link extending between said terminals, a clamping device secured to one of said mem bers in electrical conductive relation with the terminal carried by the last mentioned member and arranged to engage an electric line wire for supporting the fuse device thereon, and means 45 carried by the other of said members for se curing a second conductor in electrical conduc tive relation with the terminal carried by the said other of the members. 9. A fuse device including in combination a pair of tubular members at least partially tele 50 scoped one within the other and longitudinally slidable with respect to each other, a pair of ter minal caps mounted one on the outer end of each of said members and each having means for anchoring one end of a fuse link extending through said members, means operative upon rupture of said fuse link for effecting relative movement between said members to give indica tion of the rupture of the link, a supporting de vice connected to one of said members in elec 60 trical conductive relation with the terminal cap mounted thereon and having clamping means for engaging an electric line wire, and clamping means carried by the other of said caps for se curing an electric lead wire thereto. 10. A fuse device including in combination a fuse tube having a terminal cap on one end thereof, a tubular casing having one end slid on the edge thereof opposite to its hingedly ably telescoped over the end of said tube oppo 70 mounted edge a curved portion for guiding a line site to said cap and having a second terminal cap wire or the like into engagement with said jaw mounted on the outer end thereof, means car portions, a resilient element disposed between the _ ried by said caps for engaging the ends of a fuse element extending through said tube and easing, plates tending to force the same apart, a clamp which said fuse element serves when intact to 75 2,115,592 maintain the tube and casing in telescoped re lationship, means operative to force the tube and easing apart upon rupture of said fuse element, means for limiting the relative movement of the tube and casing, a supporting member remov . ably secured to one of said caps and having means for fastening onto an electric conductor, threaded portions for the removable securing of the cap to the housing by relative rotation of the cap and housing about the axis of said screw threaded portions, and clamping means carried respectively by said terminal cap and by the other end of said housing for securing thereto respectively a pair of conductors with the con ductors extending transversely with respect to and clamping means carried by the other of said caps for engaging a second electric conductor. 10 11. A fuse device including in combination, a the axis of said screw-threaded portions, thereby 10 to necessitate disconnection of a conductor from pair of tubular members at least partially tele scoped one within the other and slidable longi-l tudinally outward with respect to each other, a pair of terminal caps secured one to the outer 15 end of each of said members and each having at least one of said clamping means in order to permit rotation and removal of said cap from said one end of the housing for installation or re moval of a fuse link. means for anchoring one end of a fuse link ex tending through said members, means operative upon rupture of said fuse link for effecting rela tive movement between said members, clamping 15. In a fuse device of the type adapted to be suspended from an electric line conductor, the combination of a fuse tube having a bore for the accommodation therein of a fuse link, a terminal 20 means carried by one of said terminal caps for effecting engagement with an electric lead wire, and means for mounting the fuse device on an electric line wire including the other of said ter minal caps and a supporting member removably 25 fastened to the last mentioned cap and having a clamping device for removably engaging the elec tric line wire. cap mounted on one end of said tube and having s an opening in alignment with the bore in said 20 tube for the passage therethrough of a fuse link, the rim of said opening being adapted to support the button-head terminal of a button-head type fuse link, and a clamping device carried by said 12. In. a fuse device, the combination of a fuse tube having a two-part terminal cap, the 30 parts of said cap having cooperating threaded cap arranged to engage a line conductor for sup 25 porting said fuse tube on the line conductor, said clamping device having means for maintaining the supporting line conductor in ?rm engage ment with a fuse link button-head terminal rest 30 ing on the rim of said opening. portions for removable connection thereof, one of said parts being ?xed to one end of said tube 16. A terminal device adapted to be mounted on the end of a fuse tube including in combina and having means for supporting one end of a fuse link disposed in the‘tube and the other of said parts having means for fastening the same to an electric conductor, a second tube disposed telescopically about and longitudinally slidable with respect to said ?rst fuse, means for prevent ing relative rotation of said tubes about their 40 common axis, and a second terminal cap mount ed on the end of said second tube opposite to said ?rst terminal cap and having means for effect ing clamping engagement with the other end of said fuse link and with a second electric conduc tor. 13. In a fuse device, the combination of a fuse housing, a terminal cap adapted to be secured to one end of the housing, said cap and said one end of the housing having cooperating screw threaded portions for the removable connection tion a pair of cap members one tightly secured to the end of the fuse tube and having means for anchoring one end of a fuse link disposed in the tube and the second of said cap members being removably secured to said ?rst cap member, said cap members having also registering openings. for the outward projection therethrough of said one end of said fuse link and said second cap 40 member having a depression adjacent the open ing therein for accommodating a wire conductor in conducting engagement with the projecting end of said fuse link, a clamping arm hingedly mounted on said second member to swing into 45 engagement with said wire conductor, cooperat ing guide means on said arm and said second member for guiding said wire conductor into said depression, and adjustable means for forcing said clamping arm into engagement with said wire 50 conductor to clamp the said conductor in said of the housing to the cap by rotation of the hous ing relative to the cap about the axis of said depression. screw-threaded portions, said cap having means fuse tube having terminal members disposed at for clamping'the same on an overhead line wire opposite ends thereof for supporting a fuse ele or the like and for preventing rotation of the cap on the line wine or the like about the axis of said ment extending through the tube, one of said members having means providing for the quick detachable connection of an electric lead wire thereto and the other of said members being screw-threaded portions,'and clamping means for securing a conductor to the other end of said housing with the conductor extending transverse 60 ly with respect to the axis of said screw-thread removable from the end of the tube, means car 60 ried by said tube for removably mounting the ed portions, thereby to render extremely difficult tube on an electric line wire and for electrically the rotation of the housing to connect the said one end thereof to said cap when the cap is clamped on an overhead line wire or the like and connecting said removable terminal member to the line wire, and spring means operative to ef fect movement of said removable terminal out 65 a conductor is secured to the said other end of wardly from the end of the tube to an indicating the housing by said second-mentioned clamping position upon rupture of said fuse element. means. ‘ 14. In a fuse device, the combination of a fuse housing having means at opposite ends thereof for anchoring the respective opposite ends of a 70 fuse link extending through the housing, a ter 75 - 17. A fuse device including in combination, a minal cap on one end of said housing arranged to prevent access to the said anchoring means at said one end of the housing, said cap and said one end of the housing having cooperating screw 18. A fuse device including in combination a fuse tube having a pair of terminal members mounted one at each end of the tube for sup 70 porting a fuse element in the tube, at least one of said terminal members being movable with respect to the end of the tube adjacent thereto and the other of said terminals having means for connecting an electric lead wire thereto, 8 2,115,592 means for mounting said movable terminal mem ber including a metallic spring strip operative to eiTect outward movement of the movable mem ber to an indicating position upon rupture of said fuse element, and means for supporting said tube and terminals on an electric line wire in cluding a clamping device detachably engage able with the line wire and, connected to said tube and to said. spring strip. 10 19. In combination, a fuse tube having a ter minal at one end thereof provided with means for engaging one end of a fuse element extend ing through the tube, means for detachably se curing said tube to an electric line wire and for 15 electrically connecting said terminal to the line wire, a terminal member secured to the other end of said tube and having a longitudinal bore in communication and substantially axial align ment with the interior of said tube, means for 20 clamping the ‘other end of said fuse element in said bore, and means for e?ecting quick detach able connection of a wire conductor to said ter minal member including a hollow sleeve formed on the outer end of said terminal member and a plug member formed to slidably engage said sleeve with means carried by the plug for con necting said wire conductor thereto. 20. A mounting device for removably securing a fuse tube to an electric line conductor includ ing in combination a U-shaped member adapted to have its legs secured in engagement with op posite sides of a fuse tube, means extending be tween said legs for clamping the same in ?rm engagement with the fuse tube, a second U 10 shaped member having one leg relativelg;r longer than the other leg vthereof, means for mounting ' said second U-shaped member on said ?rst U»shaped member with the closed end of the sec ond member exteriorly of and substantially par 15 allel with the closed end of the ?rst member, and with the longer leg of said second member in substantially parallel slidable engagement with one of the legs of said ?rst member, and adjust able screw means interconnecting said members 20 for drawing the closed ends thereof together to clamp said line wire therebetween. SHENEY B. SMITH.