Патент USA US2114940код для вставки
H. H. R u D D ELECTR I QAL CONNECTER Filed Oct. 14, 1936 2,114,940 Patented 2,114,940 pr. 19, 1938 ‘l’ s 2,114,940 ELEQTIRIICAL CONNECTER Harold iii. Rudd, Greensburg, Pa, assignor, by mesne assignments, to Railway and industrial Engineering Company, Greensburg, li’a., a cor poration of Delaware Application October 14!, 1936, Serial No. 105,578 10 Claims. (Cl. 173-273) This invention relates to electrical connecters, tively, for receiving line conductors of different and more particularly to connecters of the type commonly known as live line clamps. Live line clamps may be used for connecting El any two wires or conductors but are especially useful for connecting a tap line or branch to a live line or conductor without cutting the latter or otherwise interfering with current ?ow through the same. An object of this invention is to provide a live line clamp of a simple construction which re duces the machining and threading of the parts to a minimum. An object is to provide a live line clamp of the rocker arm type in which the 15 rocker arm is pivotally supported upon the base member by a link that may be somewhat resilient under the normal clamping stresses, thus insur ing a firm clamping action over a comparatively wide range of adjustment of the clamp bolt. An object is to provide a live line clamp of the type 20 including a pivotally supported rocker or clamp arm, and in which the rocker arm rests upon and is held to a bearing seat by a pivot loop or link. These and other objects and advantages of the invention will be apparent from the following sizes. The link is seated on the base i in a recess be tween the sleeve 2 and an integral lug i0, and the link is pivotally connected to the arm 6 by the bent end of a malleable lug H. The plane of the link 9 passes approximately through the axis of speci?cation when taken with the accompanying 3 drawing, in which: Fig. l is a perspective view of one embodiment of the invention; and Fig. 2 is a side elevation of the same, in place on the live line and carrying a tap line. In the drawing, the reference numeral I identi ?es the rugged upper end portion of the base member which is preferably formed as a casting of malleable bronze or other metal of good ther 35 mal and electrical conductivity. The base mem ber terminates in a sleeve 2 into which the clamp bolt 3 is threaded, the upper end of the bolt threads being preferably burred, as indicated at 40 3', to prevent the accidental removal of the'bolt from the sleeve 2, and the lower end of the bolt being formed as a ring It for receiving the head of the customary fuse-hook of a switch stick. The upper surface of the base member I has a 45 transversely extending semi-cylindrical rib 5 that fits within a complementary groove at the central portion of the rocker arm 6 to form a bearing seat for the rocker arm. The outer end to of the , rocker arm overlies the sleeve 2 for engagement by the clamp bolt 3, and the tail 6b of the rocker arm ?ares away from the strap 1 to form a guide for placing the clamp on a live line L. The op— posed surfaces of the arm 6 and base I have sets 55 of complementary clamp surfaces 8, 8', respec ‘ A pivot loop or link 9 extends around the mem ber i and arm 8 to take up the reaction of the clamping pressures when the clamp is in use. the bearing seat 5, but the ?oating connection of the parts permits the link to move angularly in accordance with the size of the line conductor and the clamping pressures. The link Q is rela tively short and retains the rocker arm on the 15 bearing seat 5 when the bolt 3 is backed ed. The strap ‘l merges into a boss it that has a non-circular, and preferably square, bore for re ceiving the non-circular and'transversely aper tured head end it of a bolt that is clamped to the tap line T by a nut M. The extension l5 of the 0 strap beyond the boss if! has lateral projections it that may be bent around the tap line T to hold the anchored end of that conductor in line with the terminal strap. - The parts of the clamp may 25 be cast in metal molds to provide smooth surfaces for the bearing seat 5 and cooperating surface of the rocker arm, or the parts may be rough cast and machined or coin-pressed at the bearing and the line clamping surfaces. The relatively long bearing seat 5 and the guide action of the opposite sides of the link 9 limit the twisting of the rocker arm on the base member but provide sufficient play for a‘ self-alignment of the clamp parts upon a conductor when the grooves 8, B’ are not ex actly parallel to each other or to the e?iective piv otal axis of the rocker arm. The link 9 is somewhat resilient under the pressures usually employed in securing the clamps to a line, and the clamp bolt 3 can there 40 fore be rotated after a relatively firm clamping engagement with the line L is obtained. This re siliency of the link 9 is highly desirable as it tends to eliminate the faulty connections that are produced with other forms of live line clamps by slight backing off of the bolt 3 when the operating hook is being removed from the ring 4. There is a relatively wide range of adjustment of the clamp bolt 3 throughout which adequate clamp ing pressure is produced at the line L and the clamp will not loosen on the line under tempera ture changes and vibration when it is initially ap plied under something more than the minimum pressure that will give a firm clamping action. While I have described a preferred method of 55 2 2,114,940 assembling the clamp by bending the lug H about the link 9, it will be apparent that a split link blank may be‘ used, or an elongated link may be slipped over the parts and then pressed to ex pand it laterally and shorten its effective length. The term “substantially closed link”, as used in the following claims, designates a member of the general form ofan oval chain link whether the ends of the link blank are welded to form a com pletely closed link or are adjacent each other but not welded together. It is to be understood that there is considerable latitude in the design and relative proportions of the parts, and that many changes may be made 16 in the illustrated embodiment without departing from the spirit of my invention as set forth in the following claims. I claim: 1. A live line clamp of the type including a base 20 member, a rocker arm, a bolt carried by said base member and engaging one end of the rocker arm to force the opposite end towards said base member, and fulcrum means forming a pivot for said rocker arm when said bolt exerts clamping pressure upon one end thereof, characterized by the fact that said fulcrum means comprises a substantially closed link. 2. A live line clamp comprising a base member, means for connecting a tap line to said base 30 member, a rocker member, means mounting the rocker member on said base member for pivotal movement of the rocker arm about its central portion, and means for forcing one end of said rocker member away from said base member to 35 carry the opposite end into clamping engagement with a line conductor positioned between said accidental separation of said members from each other and from said link. 5. A live line clamp comprising a base member having means for connecting a tap line thereto, a rib at the upper surface of the bearing member, a rocker member having a groove complemental to and seated on said rib, a substantially closed link pivotally connecting said members for rock ing movement of said rocker member'substan tially about said rib, a threaded sleeve integral 10 with said base member beneath one end of the rocker member, a clamp bolt threaded through said sleeve, and cooperating clamp surfaces at the other end of said rocker member and the ad~ jacent face of the base member. 15 6. A live line clamp comprising a base mem ber of malleable metal having an integral sleeve and an integral terminal strap extending from opposite sides thereof, a clamp bolt threaded through said sleeve, a rocker member overlying 20 said base member and having one end ?aring away from said terminal strap, the other end of said rocker member being in line with said clamp bolt, cooperating clamp surfaces on said mem bers at the terminal strap side of said base mem 25 ber, a substantially closed link pivotally connect ing said members, means on said terminal strap for connection to a tap line, and malleable lugs integral with said terminal strap for bending around a tap line. 30 7. A live line clamp as claimed in claim 6, wherein said link extends around said members, and each member includes means preventing sep rocker member and base member, said mounting aration of said members from said link. 8. A live line clamp as claimed in claim 6, 85 wherein said link extends around said members, and said rocker member has an integral lug bent means comprising a substantially closed link over said link. forming a fulcrum for said rocker arm when the 40 latter clamps a line conductor to the base mem her. 3. A live line clamp comprising a base mem ber, means for connecting a tap line to said base 45 member, a rocker member, means pivotally mounting the rocker member on said base mem ber, and means for forcing one end of said rocker member into clamping engagement with a line conductor positioned between said rocker mem 50 ber and base member, said mounting means com prising a substantially closed link extending around said members and constituting a pivotal support for said rocker arm. 4. A live line clamp as claimed in claim 3, 55 wherein one of said members is malleable and has an integral lug bent around said link to prevent 9. A live line clamp comprising a base member having an integral sleeve and an integral ter 40 minal strap, means on said strap for making con nection to a tap line, a bolt threaded through said sleeve, a rocker member overlying said base mem ber, clamp surfaces on said members for engage ment with a line conductor when said bolt is 45 forced against said rocker member, and a re silient substantially closed link pivotally con necting said members. 10. A live line clamp as claimed in claim 9, wherein said link is seated against the bottom 50 of said base member between said bolt and a pro jection on said base member, and said link ex~ tends over said rocker member and is secured thereto by an integral lug on said rocker member, said lug being bent over said link. HAROLD H. RUDD.