Патент USA US2119066код для вставки
May3l, 1938. ' ' -c.w. ABBOTT ' 7 2,119,056 ELECTRIC ATTACHMENT PLUG RECEPTACLE Filed Dec. 15, 1934 @ j 32 l =‘ m’ 40¢ 1 . 46“ ......nul?w@nml /" ‘\ ‘ |||| ||||| n ‘ l6 ‘ INVENTOR CHARLES W ABBOTT BY HIS ATTORNEYS ’ 2,119,066 Patented May 31, 1938v UNITED STATES PATENT OFFICE 2,119,066 ELECTRIC ATTACHMENT PLUG ' REGEPTACLE I Charles W. Abbott, Larchmont, N. Y. Application December 15, 1934, Serial No. 757,717 7Claims. (Cl. 247-15) This invention relates to electric attachment ' plug receptacles. More particularly it relates to attachment plug receptacles for use with surface wiring where both the electric wiring conduit and 5 the receptacle are secured to the outside of the wall‘ in a room of a dwelling or other structure. My receptacle is particularly adapted for use with the wiring system described in my copending ap plication Serial No. 571,962, patented December 10 18, 1934, No. 1,984,355. It is an object of my invention to provide an attachment plug receptacle for mounting upon the surface of a wall in such a position for ex ample as adjacent the base board, which recep 15 tacle may be inverted so that either side of it may be adjacent the base board and still permit the wiring conduit to enter directly into the re ceptacle without deviation from its rectilinear direction. Another object of my invention is to provide a 20 polarized electric attachment plug receptacle for surface wiring, which can be used adjacent a base board and which may have either the grounded or the live side adjacent the base board 25 depending upon whether the grounded line is uppermost or not in the conduit. rial No. 571,962 now Patent 1,984,355. This type of conduit as explained in my aforementioned co pending application has the advantage that it is more readily adapted to turn corners than con duits for surface wiring which have been used heretofore. One reason for this, as described in my copending application is the fact that the wires l5 and I‘! lie loosely within the conduit al though they are isolated by the central rib Ma, and are not required to expand and contract in 10v the same way as the ?exible rubber casing of the conduit at corners. Notwithstanding the adapt ability of this type of conduit to make curves when necessary, it is desirable insofar as possible both from the standpoint of ‘appearance and from ease of installation that the conduit be continued in a straight line and that curves be avoided. This is particularly true where the conduit is positioned to run parallel and slightly above or adjacent to the ?oor molding or base board of a 20 room. The base ii of my receptacle preferably com prises a slab of insulating material with a ?at rear face adapted to lie against the wall III._ This base is preferably rectangular in plan and has one or more lugs ll, 20 on opposite sides of the base adapted to fit into recesses formed in the side receptacle of the above type which may be eco _walls 0! a cover 24. The lugs II are staggered nomically constructed of few parts and easily and with relation to the lugs 20 so that the cover 2i 30 may be fitted over the base‘ It in one way only and quickly assembled and attached to a wall. Another object of my invention is to provide a thus is incapable of reversal with respect to the base. This is imperative in a polarized device as receptacle of the above type which when connect ed with a wiring conduit will completely enclose hereinafter explained. The base it .has formed upon it at its central all current carrying parts. Another object of my invention is to provide a 85 Other objects and advantages of my invention will become apparent as it is described in con nection with the accompanying drawing. ‘In the drawing: Figure 1 is a plan view oi’ a receptacle con 40 structed according to the principles of my inven tion shown in position adjacent a base board. A portion of the cover of my receptacle is broken away for the purpose of illustration. Figure 2 is a plan view of the base showing the 45 construction and positioning of, the parts. This view is on a slightly larger scale than Figure 1. Figure 3 is an end view vof the construction shown in Figure 1. ' v Figure 4 is a side elevation view of my recep 50 tacle with the cover in section taken-along the line H of Figure 1. , ' v _ Referring to the drawingja' wall II with a base board l2 attached to it adjacent the ?oor, has attached to it an electric wiring conduit "of the . 55 type illustrated in my copending application Be portion a. longitudinally extending spine 20 to sep arate and insulate two identical metallic members which are secured to the base on opposite sides of the spine and comprise contact portions 2!, 20 and wire terminal portions 80, ll. These me tallic members may be stamped from sheet metal. 40 The metallic members are secured to the base by‘ means of oppositely directed arms 32 extending laterally from the wire terminal portions 30, ll and bent down into recesses 34 formed in the base It at the sides of the wire terminal portions. The contact portions 28, 20 of the metallic mem bers are bent up at right angles to the wire ter minal portions and have contact fingers 28’, 28' at their ends forengagement with the prongs of a conventional attachment plug cap in the usual 50 manner. Wire binding or terminal screws 80 are turned into threaded apertures in the wire terminal portions l0, 3! to hold the conductors or wires II and ll of the conduit IA.‘ To keep these wires from slipping out from beneath the heads 55 2 2,119,066 of the terminal screws, 2. pair of parallel fingers 38 are turned up at right angles to the wire ter _The cover of the receptacle is made of molded while in reversed position. In order that the cover may be placed on the base only in the position with the large apertures over the ground ed contacts 29', pairs of lugs l8 and 20 staggered with relation to each other project from opposite insulating material, preferably, and has ?at par allel side walls 24:: and 24b and parallel end walls sides of the base and fit into recesses in the sides of the cover. minal portion 30 adjacent the periphery of the terminal screw. 240 and 24d. The top of the cover is ?at and is . joined to the end walls by a stepped formation 10 24f, although the top could be connected directly to the end walls. Each end wall comprises a pair of spaced weak ened sections, the outline of one ofthese sections being shown at 246. These sections are made 15 mechanically weak so as to be capable of destruc ' tion upon the application of a small amount of force which may be applied by the use of a screw driver or a pair. of pliers or other handy tool in the equipment of an electrician. The portions of 20 the wall around these sections of reduced strength are considerably stronger than the sections so that the wall itself is not destroyed by the re— moval of the weak vsection. Preferably the area and shape of the weak sections are substantially 25 identical with the cross section of the wiring con duit [4 with which the receptacle is designed to be used. Therefore upon the breaking away of a. section the end of a conduit may be entered beneath the cover. In length the cover is slightly longer than the length oi the base as shown in Figure 1, in order that the conduit may enter be neath the protection of the cover before the bare - wires of the conductors l5 and I‘! are exposed for a. connection with the terminal screws 01' the 35 metallic members. Because of the fact that the conductors l5 and ll. are bare it is necessary for them to be separated immediately upon their exit from the protection of the outside covering of the conduit H. For thispurpose a pair of posts 40, 40 42 are formed upon the base at its ends in posi As before mentioned, the lower contacts 29' and conductor l‘! are grounded. Hence, in con necting the receptacle to the conduit the lower 10 weak section is broken away and the side of the receptacle is placed adjacent the top of the mold ing and is secured in that position with the end of the conduit entering under the cover up to the end of the base. At that point the covering for 15 the wires of the conduit is removed and the wires are led to the terminals 30, 3! as follows. The wire 65 is led above the post 42 around the end of the spine 26 to the terminal 30, and the grounded wire I1 is led below the post 42 directly 20 to terminal 39. If, by chance, the ground wire should be upper most in the conduit the receptacle would be re versed, putting the contacts 28’ and tenminal 30 , nearest the base board and the ground terminal 25 3| and contacts 29 uppermost. Then the section 24c and its opposite at the other end of the cover would be nearest the molding and would be broken away for the conduit’s entrance. In this case the wires are led on opposite sides 30 of posts 40 instead of posts 42. ' The value and utility of the construction and positioning of the posts 40, 42 and the pair of weakened sections in each end of the receptacle becomes apparent upon consideration of the fact that the wires l5 and I] in the conduit are bare and must not be crossed but must be kept sep arate from the moment of their exit fromithe protection of the. insulation of the conduit. The construction just mentioned gives a ?exibility of tion directly opposite the sections of reduced use to the receptacle that is not possible with , strength. Thus ‘when the conduit I 4 is entered prior constructions. beneath the cover as-shown in Figures 1 and 3 For securing the base It to the wall the spine with its end abutting the edge of the base, the 26 is enlarged at its ends and pierced as at 46 45 post 42 will in'effect form a continuation of the for the accommodation of wood screws. Also wire-isolating rib I la of the conduit. within the enlarged ends of the spine are other In some localities it is required-by the authori piercings 48 which are internally threaded and ties thatv one wire of the circuit shall be grounded in which are received machine screws coming and that electric wiring devices shall have the through apertures in the cover to hold the cover 50 terminals to which the grounded wire is to be con 7 on the base. From the foregoing it will be apparent that I nected differ in appearance vfrom the other ter have constructed a receptacle for mounting ad minal of the electric wiring device. This differ ence in appearance is generally accomplished by jacent a base board, parallel to which an electric tinning one of the terminals and leaving the conduit runs, which receptacle permits the entryv 55 other with its natural copper'or brass appearance. of the conduit therein without the necessity of 65 In the present case the lowermetallic member the conduit being bent in any way to make such (29, 38) is the one designated for connection to entry and without the necessity of deviation of the ground and conductor I1 is the grounded the conduit from its rectilinear direction or cross conductor. It will be recalled by those skilled .ing of the conduit wires. It will also be apparent 'in the art that conventional polarized attach that the foregoing is accomplished in spite of the ment plug caps have one prong larger than the . fact that the receptacle is adapted for use in a other. In' order that only that prong (the larger polarized circuit. It will furthermore be appar of the two) of an attachment plug cap which is ent that my receptacle covers'all current carry designated for connection to ground, shall be con ing parts at all points and keeps them shielded 65 nectible to the grounded metallic member, special from accidental contact which might cause a precautions must be taken in forming the cover, person to receive a shock or a short circuit to as will now be described. 000111‘. ' The top of the cover 24 is provided with two pairs of apertures 44 and 46 positioned over the Many modi?cations within the scope of my invention will occur to those skilled in the art. 70 contact ?ngers 28', 29' respectively. The.aper ‘ ‘Therefore I do not limit myself to the exact con 70 ture 46 is larger than the aperture 44 in order struction of the embodiment shown. that the larger or ground prong of the conven I claim: ‘ tional polarized attachment plug cap may fit into 1. In a polarized attachment plug receptacle aperture 46 but not into aperture 44 and hence for surface wiring, an insulating base having a 75 the cap may not be connected with the receptacle longitudinally extending central spine, metallic 75 2,119,006 r , 3. spaced sections of reduced strength any of ‘which ‘members on opposite sides of said spine, said metallic members having contact portions and sections may be removed for the entrance of a _ terminal portions, a pair of spaced posts at each surface wiring conduit running parallel to a mold end of said base, a cover ?tting over said base ing, said cover having ?at sides adapted to lie along the molding, whereby upon removal of the in and having apertures over said contact portions, said apertures being of di?erent con?guration one of said sections nearest the molding the con duit may enter into said cover in unbroken con , whereby the receptacle is polarized, said cover dition, without deviation from its rectilinear di rection, and posts on said base at each end oppo site said sections for separating the wires of said conductor within said receptacle. 5. In a receptacle for a surface wiring system, a base of insulating material, contacts thereon for engagement by the prongs of an attachment plug cap, wire terminal means on said contacts, a cover for said base having a length greater than the base, a pair of weakened sections removable for the entrance of a surface wiring conduit of the type having a central rib separating parallel wires, said base having posts opposite each of said weakened sections in position to form a con tinuation of the central rib of the conduit when the end of the conduit within the cover abuts having ?at sides adapted to lie along a base board, each end wall of said cover being provided with 10 a pair of spaced sections of reduced strength any one of which may be removed for the entrance of a surface wiring conduit running ‘parallel to the base board whereby the conduit may enter directly into said cover without deviation from 15 its rectilinear direction irrespective of which side of the receptacle is uppermost. 2. In an attachment plug receptacle for sur face wiring, an insulating base having a longitu dinally extending central spine, metallic members on opposite sides of said spine, said metallic members having contact portions and terminal portions, a cover ?tting over said base and aper tured over said contact portions, said cover hav ing flat sides adapted to lie along a base board, each end wall of said cover being provided with a pair of spaced sections of reduced. strength any one of which may be removed for the entrance of a surface wiring conduit running parallel to the base board, a ‘pair of posts at each end of 30 said base, a post being opposite each of said the end of the base. _ 6. In a receptacle for a surfacewiring system, a base of insulating material, contacts thereon for engagement by the prongs of an attachment plug cap, wire terminal means on said contacts, a cover for said base, means at each end of the cover removable to form an entrance passage for - a surface wiring conduit of the type having a central rib separating parallel wires, means opposite each entrance forming a continuation of the central rib of the conduit when the end ' sections whereby the wires of a surface wiring conduit are separated within the receptacle and the conduit may enter directly into said cover without deviation from its rectilinear direction irrespective of which side of the receptacle is of said conduit has entered said cover and is in . abutment with said base. 7'. In an attachment plug receptacle for sur face wiring, an insulating base, a cover for said face mounting, a one-piece base of insulating base, contacts within said receptacle accessible ‘material adapted to be attached to a wall, a one-piece hollow insulating cover for said base 40 40 through apertures in said cover, said cover hav ing flat sides adapted to lie along a base board, constructed vand arranged to conceal and protect each end wall of said cover being provided with vall current carrying parts on said base, said a pair of spaced sections of reduced strength any base having a central longitudinally extending rib, of which may be removed for the entrance of a like formed metallic members on opposite sides surface wiring conduit, a pair of posts at each of said rib and shielded from each other by said 45 45 end of said base, a post being opposite each of I rib, said metallic members each having a plu said sections, whereby'the wires of the conduit rality of contact portions and a wire terminal uppermost. ' ' 3. In an attachment plug receptacle for sur are separated within the receptacle irrespective of which section the conduit‘ enters. 50 4. In an attachment plug receptacle for sur portion, binding screws in said terminal portions positioned for manipulation from the front of ~ the base, said cover having slots in register with said contact portions, and sections of reduced strength in each end of said cover adapted to be face wiring, an insulating base, contact members in said receptacle for engagement by the prongs of an attachment plug, a cover of greater length than said base, each end wall of said cover having broken away to permit entrance of a conductor. ' - CHARLES W. ABBOTT.