US2033973A - Electric cord attachment plug - Google Patents

Description

March 17, 1936.I i 1 CLAYTON l 2,033,973

ELECTRIC CORD ATTACHMENT PLUG Filed Jan. 23, 1953 le wis J Clayton.

Patenterl Mar; 17, 1936 2,033,973 ELECTRIC CORD ATTACNT PLUG Lewis J. Clayton, Toront signor to Vicero Limited, Toronto,

Application January 23,

3 Claims.

ects of this invention are, to ector for flexible cords which emely rough usage and will cord from disconnection from 'I'he principal obj provide a. plug conn will withstand extr effectively hold the 6 the terminals.

A further and im a. plug of very sim tion which may be defective or damag 10 quickly replaced.

The principal features of the invention consist in the novel construction of Aa flexible socket member and a semi-flexible terminal member and metal terminals whereby the terl5 minal-holding member and the metal terminal mounted therein aresecurely held within recesses formed in the socket member but are capable of being readily removable therefrom.

In the accompanying drawing, Figure 1 is a go perspective view of my improved plug.

Figure 2 is a longitudinal mid-sectional view of the plug taken through the metal terminals and showing the manner of securing the electric cord.

as Figure 3 is a longitudinal sectional view taken on the line 3 3 of Figure 2.

Figure 4 is a perspective view of the semiexible terminal holder showing the terminals and wires in their assembled positions.

Figure 5 is a longitudinal sectional view of the flexible socket member taken on the same plane as the section, Figure 2.

Figure 6 is a longitudinal sectional view of the flexible socket member taken on the same plane 85 as the section, Figure 3.

Figure 7 is a sectional plan view of the flexible socket member taken on the line 'I-'I of Figure 6.

Numerous forms of flexible attachment plugs have been devised in which the metal terminals G are moulded into or otherwise rigidly secured in the body of the material or to a member removably secured in the flexible body.

In the invention.\herein shown the terminal holder `I preferably moulded of semi-hard rubber,

is formed with a circular portion 2 provided with a projecting annular flange 3 and extending from the back thereof is a centrally arranged lug 8 extending across one diameter thereof. This lug is formed with inwardly tapering sides and lo inwardly tapering edges 6 leading to a flat-sided portion I which is provided with a hole 8 extending therethrough.

A pair of narrow one at either side o l extend through th portant object is to devise ple and inexpensive construceasily assembled and in which ed terminals may be easily and parallel slots 9 are arranged f the base of the lug 4 and e circular portion 2.

y Manufacturi Ontario. Caa

o, Ontario, Canada, as-

g Company 1933, Serial No. 652.999

(ci. 11a- 361) slots are spaced apart the desire the spacing of the terminals.

The terminals I0 are each formed of a metal strip of the samedimensions as the slots 9 and one end II of each is bent at right angles and the short end is provided with a. threaded hole in which a binding screw I 2 is threaded.

The body I3 of the plug is moulded in one piece preferably of a flexible rubber material and is provided witha tubular shank I 4 and a. flaring bell end I5 which may have any desirable external pattern. f

The inner Wall of the bell end I5 is formed with an annular groove I6 of approximately the same diameter and depth as the flange 3 of the member I and the inner diameter I'I of the chamfered rim is adapted to iit snugly around the perimeter of the circular part 2 of the member I..

A pair of recesses I8 are moulded in the inner wall of the bell end of the body I3 in diametrically opposed relation and these extend inwardly from the groove .I6 toward the tubular shank. 'I'he inner wall of the bell end I5 tapers inwardly from the groove I E so that when the member I is Inserted therein the tapering surfaces 6 of the member I fit snugly thereagainst as shown` in Figure 3 and the perforated end 8 fits snugly into the bore of the tubular shank.

The laterally and outwardly turned ends II of the terminals and the screws. I2 extend into the recesses I8 and the tops of the; screws snugly Aabut the top surfaces of the recesses.

In assembling this device, the terminals pushed through the slots 9, the walls of snugly hold the terminals in a parallel position. The ends of the wires I9 are threaded through the hole 8 from opposite sides and the ends are erminals by the binding screws. locked securely by being crossed through the perforated lug and as the lug is of a semi-hard material, preferably -a rubber compound, the wires will not be fractured by pulling against the lug nor will the insulation be injured. wires of the terminals have thus d distance for III are which d forms a subwire should become disconnected itis merely necessary to strip the bell end of the body member from the terminal holder and pull out and replace the damaged member or repair the connection and then replace the terminal holder.

The extreme simplicity of the device as well as its remarkable cheapness will, from thisV 'lescripltion, be readily apparent.

It will be noted that the electric wiresl passing through the hole 8 will, upon being pulled,L stretch the material of the lugs so that the -hole is elongated and the side walls of the hole ac ts as a snubber to hold the wires securely.

I What I claim as my invention iszl. An electric attachment plugincluding an outer resilient tubular member and an inner contact blade holding member of relatively rigid material removably arranged within said outer tubular member, said blade holding member having contact blades removably threaded therethrough and said blades having their inner ends turned laterally and directly overlapping the rearward side of the holding member, binding screws in said laterally turned ends, disposed in the longitudinal direction of the plug the inner wall of the outer tubular member having bottomed notches formed therein accommodating the laterally turned ends of the terminals and the binding screws, and means retaining said blade-holding member resiliently interlocked with said outer tubular member with the heads of -said binding screws engaged in cushioning pressure contact with the bottoms of said notches.

2. An electric attachment plug of the interiitting two piece type composed of an outer tubular element and an inner blade holding insert having spaced contact blades mounted therein and lead wires connected to the blades and extending rearwardly, in combination with a rearwardly elongated resilient rubber lead-gripping member directly connected with and extending rearwardly from said inner blade holding insert in a plane intermediately between the plane of disposition of said spaced blades, the rearwardly extending 'lead wires being converged and looped transversely through and frictionally engaged by said rearward extension from opposite sides to provide a cushioned strain relief anchorage therefore.

3. An electric attachment plug including an outer resilient tubular member and an inner contact blade holding member of relatively rigid material removably and resiliently interlocked with said outer tubular member, said blade holding member having contact blades mounted therein and having a resilient rearwardly extending lug formed integral therewith, said lug having a single opening therethrough at its inner end extending in a direction transversely of the longitudinal axis of the tubular outer member and of a size to snugly receive a pair of side by side lead wires in frictional contact, and lead wires extending laterally through said single lug opening and crossing each other in side by side relation therein and extending forwardly within said outer member for connection withthe rearward ends oi said contact blades, said lead wires being adapted on longitudinal stress to' tension said resilient lug and said lug when tensioned being adapted to constrict the walls of the said opening into frictional gripping engagement with the inserted leadv wires.

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