Патент USA US2110743код для вставки
March 8, 1938. R. W.. SHOEMAKER 2,110,743 BUS-BAR Filed May 29, 1935 2 Sheets-Sheet 2 §\\\\\\\\\\\\\\\\\\\\\\\\\\\ì\ ë ë è à ä \ E \ è Patented Mar. 8, 1938 2,110,743 y PATENT ort-‘ICE ` UNITED STATES z,11o,'143 ~ 'BUS-BAR Richard W. Shoemaker, Woodbury, Conn., aS signor to The Chase’ Companies, Incorporated, Waterbury, Conn., a corporation Application May 29, 1935, `Serial No. 24,061 (Cl. 173-13) gral tubular bus-bar having slot-like ventilating bus-bars, and particularly to bus-bars of tubular ports; and U 2 Claims. This invention relates to an improvement in form in cross-section. Fig. 7 .is a transverse sectional view taken on the line iI-II of Fig. 10. ` In alternating-current bus-systems, lthe walls 5 of the tubular bus-bars aresubjected to very The particular bus-bar 20 illustrated in Figs. Cri 1 to 5 inclusive of the accompanying drawings is of rectangular form in cross-section and includes high collapsing strains, especially under short» circuit conditions. 'In a 60-cycle alternating current system, the collapsing force would be of a iiat top-wall 2 l, a iiat bottom-wall 22 and com a pulsating or vibratory character exerted 120ß plementary flat side-walls 23 and 24, all of which 10 times per second. Composite bus-bars, as gen- `‘i are formed integrally. 'I‘he bus-bar is preferably erally heretofore made, have required that their component parts be securely clamped together at short intervals, but, owing tothe mechanical vibrating eil’ect of the current passing there 15 through, such fittings have been 'susceptible to loosening under the vibrating force which under of drawn copper or other metal of high electro conductivity. , is formed with a longitudinal series of spaced some conditions may rise as high as 5,000 lbs. per linear foot of bus-bar. ' Adjacent its point of juncture with the inte gral side-wall 24, the top-wall 2l of the bus-bar „ apart air-egress ports 25, each of which is sepa--I rated from its neighbor by an integral web .26* completing the one-piece perimeter of the said One of the objects of the present lnventionis" ports. to provide a ventilated tubular bus-bar which The bus-'bar is also formed in its bottom-wall will be substantially proof against the disinte 22 with a longitudinally-extending series of air grating effects of the vibratory stresses set up by ingress ports 26 which are located longitudinally heavy currents flowing therethrough. intermediate the air-egress ports 25 and also A further object is to provide a ventilated tubu laterally displaced with respect to the latter, >so as to be located adjacent the junction point of 25 lar bus-bar having superior rigidity. Another object is to provide a tubular bus-bar the said bottom-wall 22 with its integral side-wall `in which the character of the Ventilating-means 23. Like the ports 25, the air-ingress ports 26 is such as to have a minimum eiïect upon the are separated from each other by integral webs conductivity of the bus-bar. 26", the ends of which latter>` complete the inte A still further object of the present invention gral walls of the said ports 26. 30 30 is to provide an arrangement whereby the bus As the bus-bar becomes heated due to the bar will be effectively cooled by air-currents passage of an electric current therethrough, air without unduly reducing its conductivity or i will be drawn, by convection, inwardly through mechanical strength. ` the air-ingress ports' 26 in the bottom-wall 22 a - With the above and other objects in View, as and will flow both longitudinally and laterally, will appear to those skilled in the art from the and will ultimately exit upwardly through the following, considered in conjunction with the air»egress ports 25 in the top-Wall 2|, as indicated accompanying drawings and appended claims, particularly well in Figs. 3 to 5 inclusive. By the staggered relationship of the air-ingress the present invention includes all features within ports 26 and the air-egress ports 25, a maximum 40 the range of the said claims. In the accompanying drawings: A Fig. 1 is a broken plan view of a portion of a bus-system composed of bus-bars embodying the present invention; 45 _ Fig. 2 vis a broken perspective view of one form which a tubular integral ventilated bus-bar may assume in accordance with the present in:1 Fig. 3 is a longitudinal sectional view thereof, taken on the line 3--3 of Fig. 2; Fig. 4 is a transverse sectional view taken on the line 4--4 of Fig. 2; Fig. 5 is a similar view taken on the line 0-5 55 air entering through the ingress-ports 26 is forced to travel both longitudinally and laterally before it can escape from the interior of the bus-bar, thus wiping, so to speak, a maximum mount of the internal surface of the tube. ~- Furthermore, by staggering the egreM-ports ‘25 vention; of Fig. 2; cooling effect is obtained with a minimum amount of cutting away of the metal, inasmuch as the ` _ Fig. 6 is a broken perspective View of an inte and the ingress-ports 26 longitudinally with reu spect to each other, the conductivity of the bus bar the case is cutwere down the tosaid a lesser portsextent located than transversely> would ‘ in line. In other words, despite the fact that the tube is perforated both top and bottom, .con ductivity of the tube at any given transverse 2,110,743 point is cut/down only by the amount of metal removed by the production of but one port. The mechanical strength of the bus-bar is also least affected by the staggering of~ the ports, as de scribed. ` When heavy alternating currents are ñowing through the bus-bar, the webs 25* and 26* effec tively prevent relative movement between the metal on the respective opposite sides of the ports 10 25 and 26, thus obviating one of the objections inherent in. prior bus-bar structures. In Figs. 6 and 7 is shown an integral drawn tubular bus-bar 3l, also of rectangular form in cross-section and including a top-wall 35, a bottom-wall 3B and complementary side-walls 31 and 3|, all formed integrally with each other. Instead of perforating the top- and bottom walls, the bus-bar 34 is perforated in its side walls in staggered relationship. Thus, the side wall 31 is provided with a series of longitudinally extending slot-like air-egress ports I9, located in the said> side-wall adjacent the point of the junction of the latter with the top-wall 35 and having `interposed between them lintegral webs 25 3P. At a materially-lower level than the level of the ports n, the wall Il of the bus-bar is formed with a series of longitudinally-extending slot-like air-ingress ports 4I, preferably located in the said side-wall at point adjacent the junction 30 of the latter with he integral bottom-wall 36 and spaced from each other by integral webs Ml. By reference to Fig. 7 in particular, it will be seen that the egress-ports 30 and the ingress ports 4I, by virtue of their vertically-staggered relationship, cause air entering the said ingress ports 40 to wipe against a large area of the interior surface of the tube before escaping through the egress-ports 39. It will be noted that while a given pair of the 40 ports I9 and ll are vertically staggered in dis placed relationship with respect to each other, they are substantially laterally in line, and for this reason it is preferred to secure the necessary 'I'he invention may be carried out in other specific ways than those herein set forth with out departing from the spirit and essential char acteristics of the invention, and the present em bodiments are, therefore, to be considered in all respects as illustrative and not restrictive, and all changes coming within the meaning and equivalency range of the appended claims are intended to be embraced therein. I claim: 10 l. A one-piece wrought tubular bus-bar de signed and adapted for current-carrying bus systems and composed of high electro-conductive metal and of rectangular form Vin cross-section and having substantially-flat integral top-, bottom- and side-walls; the said rectangular bus bar being formed in a lower wall-portion with a longitudinal series of spaced-apart air-ingress ports, and also formed in an upper wall-portion with a longitudinal series of spaced-apart air egress ports, the individual air-ingress ports bc ing separated from others of the series thereof by webs of metal formed integrally with the metal of the rectangular bus-bar, and the in dividual air-egress ports of the series thereof be 25 ing also separated from companion ports by in tegral webs; certain of the said series of air ingress ports’being located laterally intermediate the longitudinal center-line of the upper-wall portion of the bus-bar and a side-edge of such wall portion and laterally staggered with respect to certain of the said series of air-egress ports and the staggered relationship being such that the upper-wall portion of the bus-bar is substan tially solid in the areas immediately above the 35 said ingress-ports, thus causing air entering the former to wipe laterally across the interior sur face of the rectangular bus-bar before exit through air-egress ports. 2. A bus-bar system .comprising a plurality of 40 one-piece wrought tubular bus-bars and com posed of high electro-conductive metal and of rectangular form in cross-section and having sub stantially-flat integral top-, bottom- and side walls; the said rectangular bus-bars being formed 45 port area by making the said ports of slot-like form extending longitudinally of the bus-bar, so that the reduction in cross-sectional area of the bus-bar at a given point is kept at a minimum. of spaced-apart air-ingress ports, and also in a lower wall-portion with a longitudinal series All of the bus-bars herein illustrated are ex formed in an upper wall-portion with a longi tremely economical of installation and effective in operation, owing largely to the integral char acter of the structure. Thus, especially under tudinal series of spaced-apart air-egress ports, the individual air-ingress ports being separated short-circuit conditions, the pulsating collapsing formed integrally with the metal of the rectangu lar bus-bar, and the individual air-egress ports of the series thereof being also separated from forces (which are applied and released 120 times per second in a 60-cycle system) have no effect 55 in loosening one wail with respect to another. Furthermore, by the integral character of the webs between any given pair of ports of the same series, not only is -superior mechanical strength obtained, but clamping-fittings, usually required in great numbers, may largely, if not entirely, be dispensed with. It will be obvious, without further illustration, that the various ports may be of 'various shapes and spacings. Bus-bars of rectangular form in cross-section are much to be preferred in present practice, for the reason that they provide suit ably-located flat faces against which connecting plates for branches (both vertical and horizon tal) may be secured. froml others of the series thereof by webs of metal companion ports by integral webs; certain of the said ports being located laterally intermediate the longitudinal center-line of the upper-wall portion of the bus-bar and a side-edge of such wall por tion and staggered relative to others of said ports in directions both laterally and longitudinally of the bus-bar and the staggered relationship being such that the upper-wall 'portion of >the blu-bar is substantially solid in the areas immediately above the said ingress-ports, thus causing air entering ingress ports to travel both laterally and longitudinally through the interior of the rectangular bus-bar and exit through air-egress ports. RICHARD W. SHOEMAKER.