US1519498A - Cluster plug - Google Patents

Description

Dec. 16, 1924. I 1,519,498

C.S.MALLETT CLUSTER PLUG.

Filed Aug. 23, 1921 INVENTQR. b QiMaflefi. 3 M5 Patented Dec. 16, 1924-.

UNlTED STATES CHARLES STANLEY MALLE'IT, F TORONTO, ONTARIO, CANADA.

CLUSTER PLUG.

Application filed August 23, 1921.

1' 0 all whom it may concern:

Be it known that I, CHARLES STANLEY MALLETT, a resident of the city of Toronto, in the county of York, in the Province of Ontario, Canada, have invented certain new and useful Improvements in Cluster Plugs, of which the following is the specification.

My invention relates to improvements in cluster plugs and the object of the invention is to so construct the plug that the cover can be manufactured of insulated material such as porcelain as well as the base. A further object is to provide means for providing a better electrical connection between the lamp screw shells and the main screw plug shell. A still further object is to provide means for preventing the lamp screw shells from turning relatively to the cover and at the same time preventing their movmg inwardly.

My invention consists of a cluster plug constructed and arranged substantially as hereinafter more particularly described and illustrated in the accompanying drawing in which:

Fig. 1 represents a side elevation of a cluster plug of the two socket type constructed according to my invention.

Fig. 2 is a similar view to Figure 1 showing the cover in section.

Fig. 3 is an elevational view of the base of the plug and attached parts viewed at right angles to Figures 1 and 2.

Fig. 4 is a plan view of the cover.

Fig. 5 is an inverted plan view of the base, and

Fig. 6 is a plan view of the main screw plug.

Like characters of reference indicate corresponding parts in the difierent views.

1 is the base of the cluster plug constructed of suitable insulating material such as porcelain and provided with the upwardly extending shank 2 carrying the main screw plug shell 3. a are inwardly extending teats formed on the top of the main screw plug shell 3 and adapted to be inserted into indentures in the shank 2. 6 are indentures in the vicinity of the lower end of the main screw plug shell 3 adapted to be insert-ed into corresponding indentures in the shank and to prevent longitudinal displacement of the shell from the shank. 7 is an annular depending portion formed on the lower face of the base 1 and provided with the depend ing wedge-shaped boss 8 having two side Serial No. 494,566.

walls inclined oppositely at angles of approximately torty-five degrees. 9 are correspondingly inclined ridges formed on the inclined walls of the boss 8. 10 is a vertical slot formed in one side of the boss 8 and extending up to the lower face of the depending portion 7. 11. is a vertical slot extending up through the member 7, through the base 1 and through the shank 2 to the top thereof as is shown in dotted lines in Figure 3. It is to be understood that the base 1, the shank 2, depending portion 7 and the boss 8 are preferably formed integrally one with the other and are constructed of insulating material such as porcelain.

12 is a hollow cover constructed of insulating material such as porcelain and provided with the oppositely inclined annular orifices 13, the inclination of the orifices in the form of cluster plug shown being ap proximately forty-five degrees. let is an annular shoulder formed in the open top of the cover 12 to receive the depending portion 7 of the base. 15 are cut-away portions in the cover and 16 are screws for connecting the cover to the base, as is shown in dotted lines in Figure 1. 17 are lamp screw shells inserted into the orifices 13 in the cover, the shell being provided with a closed flanged base 18 adapted to engage the inner edge of such orifice and also with the slot 19 of the same shape as the corresponding ridge 9 into which such rid e is ada oted to be inserted.

20 is a tongue of conducting material bent at its lower end to constitute opposed saddle pieces which are connected to the corresponding lamp screw shells by means of rivets 22, said saddle pieces being suitably bent to conform in shape to the shape of the lamp screw shells. 23 is a strip of metal, the ends of which are oppositely inclined, said strip of metal being attached centrally ot' the ridges 9 by means of the Vertical screw 2d which extends up through the boss 8, depending portion 7, base 1 and shank 2 to the top of the latter and also holds in place the contact washer 25, said member 23 being adapted to constitute the centre contact for the lamp screw shells and to engage the centre contact of the lamps when they are screwed into the lamp screw shells 17.

From the above description. it will be seen that when my cluster plug 18 assembled:

the lamp screw shells 1? will be prevented from turning by the ridges 9 entering the slots 19 in the lampscrew shells. Such lamp screw shells 17 will also be prevented from moving inwardly by coming into contact with the inclined walls of the boss 8.

The tongue extending up through the slot 11 is turned over into the form of a hook 26 and soldered to the corresponding teat i, it being understood that the slot 11 communicates with one of the ind'entures 5 in the shank and consequently a better electrical connection will be made.

Hitherto in the construction of cluster plugs it has been the custom to manufacture the cover of conducting metal such as brass. This presents the disadvantage that persons touching the plug are afraid of getting asl'i'ock and one of the advantages of my conc'on'st'ru'cti on is that the cover may be constructed of insulating material such as porcelain.

Many modifications may be made in my invention without departing from the spirit of the same or the scope of the claims and the form shown is to be taken in an illustrative and not in a limiting sense. For instance it would be Within the scope of my invention to so construct the plug that any number of lamp screw shells will be provided instead of the two illustrated. This could be done by merely changing the shape of the boss 8 to provide inclined walls corresponding to the number of lamp screw shells and to provide the ridges 9 thereon, it then only being necessary to extend the saddle piece 20 to connect with the flanges of the remaining lamp screw shells.

What I claim as my invention is:

1. In a cluster plug, the combination with the base, of a cover of insulating material suitably secured thereto, said cover having l amp screw shell receiving orifices extending t'l'ierethrough, lamp screw shells freely inserted from the inside of the cover into said orifices and each having an opening in its inner end wall, means bearing against the inner end of the shell for preventing its inward movement, and projections car ried by the bearing means adapted to engage the openings of the inner end wall of each shell to prevent its turning movement.

, 2. In a cluster plug, the combination with the base constructed of insulating material and having a depending boss formed thereon, of a cover of insulating material suitably secured to the base, said cover havrln'g lamp screw shells inserted into said orifices, said shells having outwardly extending flanges engaging the inner ends of said orifices and said boss engaging said flanges for preventing inward movement of the shells, said shell flanges having slots therein and ridges on the boss inserted into said slots for preventing the turning of the shells in the orifices.

In a cluster plug, the combination with the base of insulating material having a wedgeshaped boss formed thereon, ridges formed on the inclined walls of the said boss, a cover of insulating material having inclined lamp screw shell receiving orifices extending therethrough, lamp screw shells inserted into said orifices having outwardly extending flanges with lateral slots and closed bases, said bases having lateral slots therein, said inclined walls engaging said closed bases and the ridges on said inclined walls inserted into said slots.

4. In a cluster plug, a base of insulating material having an upwardly extending shank formed thereon, a main screw plug shell on said shank, a depending wedgeshaped boss formed on said base and having ridges on' the inclined walls thereof, a cover of insulating material suitably secured to said base and having inclined lamp screw shell receiving orifices extending therethrough, lamp screw shells inserted into said orifices, each of said shells having a closed base with an outwardly extending flange engaging the inner edge of the corresponding orifice and a lateral slot extending through said closed base, a conducting tongue extending up through said boss, base and shank and connected at its upper end to the main screw plug shell and means for connecting the lower end of said tongue to the said lamp screw shells.

5. In a cluster plug, a base of insulating material having an upwardly extending shank formed thereon, a main screw plug shell on said shank, a depending wedgeshaped boss formed on said base and having ridges on theinclined walls thereof, a cover of insulating material suitably secured to said base and having inclined lamp screw shell receiving orifices extending therethrough', lamp screw shells inserted into said orifices, each of said shells having a closed base with an outwardly extending flangeengaging the inner edge of the corresponding orifice and a lateral slot extending through said closed base, a conducting tongue extending up through said boss, base and shank and connected at its upper end to the main screw plug shell, the lower end of the tongue bent to constitute a saddle piece suitably secured to the flanges of the respective lamp screw shells.

6. In a cluster plug, a base of insulating material having an upwardly extending shank formed thereon, a main screw plug shell on said shank, a depending wedgeshaped boss formed on said base and having ridges on the inclined walls thereof, a cover of insulating material suitably secured to said base and having inclined lamp screw shell receiving orifices extending therethrough, lamp screw shells inserted into said orifices, each of said shells having a closed base with an outwardly extending flange engaging the inner edge of the corresponding orifice and a lateral slot extending through said closed base, a conducting tongue extending up through said boss, base and shank and connected at its upper end to the main scr-ew plug shell, the lower end of the tongue bent to constitute a saddle piece suitably secured to the flanges of the respective lamp screw shells, a central contact screw extending through the 10 boss and having its free ends extending 15 through the slots in the lamp screw shells.

CHARLES STANLEY MALLETT.

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