US1143536A - Attachment-plug fitting. - Google Patents

Description

G.,W. GOODRIDGEI ATTAQHMENT PLUG FITTING. APPLICATION FILED DEC.2.3.1914.

Patented June 15 1915.

6 Q in e 6 6 6 UNITED STATES OFFICE.

GILBERT W. GOODRIDGE, OF BRIDGEPORT, CONNECTICUT, ASSIGNOR TO THE BRYANT ELECTRIC COMPANY,.OF BRIDGEPORT, CONNECTICUT, A CORPORATION OF 0011- NECTICUT.

ATTACHMENT-PLUG FITTING.

Patented June 15, 1915.

application filed December 23, 1914. Serial No. 878,794.

To all "whom it may concern:

Be it known that I, GILBERT 1V. Goonrmcn, a citizen of the United States of America, and residing at Bridgeport, in the county of Fair-field and State of Connectiout, have invented a certain new and Im proved Attachment-Plug Fitting, of which the following is a specification.

The present invention relates to attach ment plug fittings and the special object of my invention is to provide a lighting fixture combined with an attachment plug by means of which the fitting may be detachably mounted in astandard plug receptacle together with means for firmly supporting the fitting in adjusted position.

In the accompanying drawings, Figure 1 is a perspective of a device embodying the presentinvention in one form and illustrated in installed position; Fig. 2 is a broken section through a standard receptacle showing portion of the present attachment plug fitting installed therein; Fig. 3 is an interior plan of the outer button of the attachment plug shown in Figs. 1 and 2; Fig.4 is a plan of the cooperating button showing the position of the wire terminals thereon; and Fig. 5 is an inverted plan of the receptacle cover.

The present invention is here shown em bodied in an attachment plug 10 01 known .type and comprising an outer insulating button a and an inner insulating button I). The outer button (1. is recessed to afi'ord a chamber 11 into which the wire terminals 12, carried by the inner button 12, project and within which may be arranged any suitable strain-relieving means, such as a knot 13 in the wire cable 14. The plugging terminals 15 are connected to the bases of the wire terminals 12 and cooperate in known manner with the jacks 16 of the receptacle 17 A metallic tube 18 forming a guide for the wire cable and opening to the chamber 11, extends from the outer end of the plug and is made fast-to the latter by means of an exterior nut 19 and a cooperating nut 20, lying within the chamber 11. Thischamber being of noncircular contour it is possible to form a nut 20 of hexagonal form,

1 the sides of which engage between the walls the nut against rotation.

21 (Fig. 3) of the chamber and thus hold A metallic cap 22 is p'referably crimped over the outer face of the button a so that the turning down of the nut 19 thereon does not tend to, injure or deface the exposed surface of the plug.

The wire cable 14, passes out through the guide arm 18 and supports a lighting fixture 23 of any desired character. \Vhile the guide arm 18 is rigid with the plug, the

ceptacle, but the strain incident to the support of the light is removed from the attachment plug proper and transferred to a fixed member, such as the cover plate 24 for the receptacle. To this end a sleeve 25 is slipped over the guide arm 18 and provided with a pair. of hook arms 26, pivoted thereto on opposite sides at 27 and adapted at their free ends to take into eyes 28 rigid with the receptacle cover plate 24. The latter is rigid with the outlet box (\not shown) through the yoke piece of the receptacle in well known manner.

The sleeve and hook arms combined form as it were a supporting bracket intermediate the attachment plug and the light, relieving the plug and receptacle terminals from the strain incident to the support of the droplight. In order to make this bracket support firm, I employ a draw-up nut 29 which engages a shoulder 30 on the tube 18 and which isinternally threaded to screw on the threaded portion 31 of the sleeve 25. Obviously the rotation of the draw-up nut 29,

after the hooks 26 have been engaged in the eyes 28, results in forcing the attachment plug firmly home in the receptacle and in establishing a firm engagement between the arm 18 and cover plate 21 which relieves the attachment plug and receptacle termi nals from any supporting strain.

In order to maintain the sleeve 25- in proper position for the engagement of the hook arms with they eyes 28, I prefer to provide a slot 32 therein in which engages astop pin 33 which may be threaded into a hole in the tubing 18 after the sleeve has been placed in proper position. .To prevent the escape of the draw-up nut 29 and tohold it conveniently adjacent thesleeve' 27,

. over opposite edges of the aperture in well I insert a stop pin 34; ata suitable distancevfrom the nut on the tube '18.

understood manner. p

The manner in whlch the fitting 1s H14 stalled is easily understood. Assuming the dralwaip nut 29- to' be detached from the sleeve 25, theattachment plug is inserted in the receptacle and pushed home. The sleeve 25 is moved into such. position that the hook arms 96 may be freely engaged in the eyes- 28. with the threaded end 31- of the sleeve 25 The draw-up nut 29 is then engaged and rotated until the latter has been moved along the tubular arm j- 18 a sufiicient dis-;

tance to tighten the engagement of the arms 26 with the eyes 28. Thefitting' as a wholeis thereby 'renderedrigid -;with the cover plate 24 and the b tter takes the strain of the pendent fitting 23 as well as of the guide arm 18.

While the invention is shown applied to a particular type of plug in common use, it is obv ously equally applicable to attachment plugs of various other constructions, and I do not limit my invention to the particular embodiment shown. lVhile a'pair of sup-,

porting arms 26 is preferred, the number may be varied to suit thenecds of particular installation and various changes in the details of the draw-up mechanism will readily suggestthemselves. I

ll claim as'my invention I 1. An attachment plug fitting comprising an attachment plug, aguide arm rigid with the outer end of the plug and. serving to sup-. po'rtthe leadingin wires for the latter;-=a11d a bracket device on said guide arm, said bracket device comprising a pivoted arm having at its free end means to'engage a supporting element at the plug receptacle, togetherwith draw-up mcans for said bracket device operative after said engagemom. has been effected.

An attachment plug fitting comprising an attachment plug, a guide arm rigid with the outer end of the plug and serving, to sup port the leading-in wires for the latter, and

a bracket device on said guide arm. said bracket device comprising a sleeve slidably mounted on said guide arm and an arm pix e otcd on said sleeve-and adapted at its free' end to engage a supporting element at the plug receptacle,together with a draw-up device For displacing said sleeve after said en-.

' gag'cment has been effected.

3. An attachment plug fitting comprising bra-cketdevice comprising a threaded sleeve shdably mounted on said guide arm, means on said sleeve to engage a rigid support at the plug receptacle and a draw-up nut on the guide arm adapted to engage the threaded portionoof the bracket sleeve and displace 'the same, for the purpose specified. I 4. An attachment plug fitting c'om rising an attachmentplug, a guide M'mlif'tl with the outer end of theplug and serving to support the leading-in wires for the latter, and a bracket device on said guide arm, said bracket device comprising a threaded sleeve to afford a chamber of non-circular contour at least in part'and adapted to receive strain relief means, in combination with arigid tubular wire guide 'arin having a threaded end opening into said chamber and extending outwardly from the outer end of the plug, in combination with a nut seated in the non-circular. portion of said chamber and held against rotation by the'walls thereof, said nut engaging the threaded end of the guide arm to hold the same against withdrawal.

- 6; In a fitting of the type described, an attachment plug having a. rigid wire guide arm extending outwardly therefrom, a slipslidably mounted on said guide arm, means on said sleeve to engage a rig d support at the plug receptacle and a draw-up nut on porting bracket mounted thereon and havporting bracket mounted thereonand having on opposite sides a pair of-hooks. in combination with a receptacle cover plate having adjacent its opposite ends a pair of eyes to receive said hooks.

In testimony whereof I have signed my name to this specification, in the presence of 'tvvo subscribingwitnesses.

GILBERT W. ooonumon.

Witnesses H. M. \Vionnwr, H. W. BADE'AU.

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