US 1491873 A
Description (OCR text may contain errors)
April 29, W24 I A. MCMURTRIE ADAPTER FOR CONNECTING DEVICES Filed Nov. 10, 1920 Patented Apr. 29, I924.
AIDNAH MCMURTRIE, OF NEW YORK, N. Y., ASSIGNOR TO THE THOMAS & BETTS 00., OF ELIZABETH, NEW JERSEY, A CORPORATION OF NEW JERSEY.
ADAPTER FOR CONNECTING DEVICES.
Application filed November 10, 1920. Serial No. 423,061.
To all whom it may concern:
Be it known that I, ADNAH Mc-MURTRIE, a citizen of the United States, residing in the city, county, and State of New York, have invented certain new and useful Im provements in Adapters for Connecting Devices, of which the following is a specification.
My invention relates to devices for connecting electrical conduits, cables, or the like to electric outlet boxes and the like. It
relates more particularly to what I mayterm adapters for connecting devices, by which I mean appliances which may be used in connection with connectors, to enable a connector of one size to be mounted within openings of other or diflerent sizes in outlet boxes or the like.
There are at present a large variety of connectors on the market designed to fit conduit openings of diiterent sizes, in outlet boxes. Various diiferent designs are made to fit a one-half inch conduit openin ,for example, these connectors being of di erent sizes and shapes to permit the attachment, at various angles, of different sizes of conduits and cables to an outlet box or other appliance. Various other designs of connector are made for use in connection with three-quarter inch openings in outlet boxes while others are designed for use in connection with one inch openings in outlet boxes. The aim of my invention is to provide attachments whereby any design of connector intended for use with a half-inch opening, for example, may readily be used in connection with openings of a larger size such as three quarter inch or one inch. Accordingly, by the use of my invention, the variety of connectors which must be nanufeatured and kept in stock will be greatly reduced.
I accomplish this purpose, very simply and efficiently, by the provision of bushings and also preferably of washers, which may be mounted on the neck of a connector.
Each bushing is provided with a head and with a shank of less diameter than the head.
The shank has an external diameter of a size suitable to seat within a desired opening in an outlet box wall. The connector, of a size smaller than that of a particular opening, may be secured in position by utilizing an abutment preferably by mounting a washer, on the neck of the connector in position to engage one surface of the box wall surrounding the opening, while the bushing is mounted on the connector neck in position to insert the shank of the bushing through the opening and to cause the head of the bushing to engage the opposite surface of the box wall.
In order that my invention may be more clearly understood attention is. hereby directed to the accompanying drawings forming part of this application and illustrating certain embodiments of my invention. In the drawings, Fig. 1 represents a vertical section showing one form of my invention, mounted in position, an electric conduit being shown therein, in side elevation:
Fig. 2 is a view partly in side elevation and partly in section, of the various parts of the device shown in Fig. 1, separated for clearness; Fig. 3 is a view partly in side eleva' tion and partly in section of another iorm of device embodying my invention; Fig. 4: is a front elevation of the device shown in Fig. 3 and Fi 5 is a vertical section form embodying a neck 1 provided with ex-,
ternal screw-threads 2. At the rear end of the screw-threaded neck a peripheral flange '3, of reater diameter than the threaded neck, is provided, a clam ing ring 4 being provided at the rear end 0? the connector. This ring is shown as having a pair of up-turned ends 5, 5 through openingsin which a screw 6 is extended. An electrical conduit or cable 7 passed through the connector may be clamped in position by tightcniug the screw 6, the ring a having one side-portion 4 which is separated from the body of the connector and is free to be moved toward and away from the other side of the ring by means of the screw, in the usual manner.
The connector is adapted to be secured to an outlet box having an opening of onehalf inch diameter, for example, within which opening the neck 2 is designed to fit. \Vhen the connector is to be used with an outlet box having an opening of threequarters inch diameter, for example, in its wall represented at 8, a bushing 9 of suitable size is used. This bushing is provided with a head 10 and a shank 11 of less diameter than the head. The bushing may be provided with internal screw threalds shown at 12, adapted to engage with the threads 2 on neck 1. The head 10 may be of a form suitable for easy manipulation by the thumb and finger of the person mounting the device.
The shank 11 is of a suitable dlameter so that it may be slipped through the opening in the wall 8. If the opening is of threequarters inch diameter, for exam 1c, the shank 11 will be of an external iameter slightly less than three-quarters of an inch.
- the connecting device itself is provided with no suitable abutment means for this purpose, a separate abutment means, in the nature of a washer, may be provided. I have illustrated such a washer at 13, this washer having a radially extending portion 14 which is adapted to be slipped over the neck 2 into engagement with shoulder 3. The washer also has a peripheral flange 15 of suitable diameter extending about the opening in the wall 8 so that the end of flange 15 may bear against the adjacent surface of wall 8 sur rounding the opening therethrough.
The washer may be loosely slipped over the neck of the connector, as shown, so that it will engage against the shoulder 3, or it may be secured to the connector by screwing the same thereon or otherwise fastening it in place on the connector, it not being deemed necessary to illustrate the various methods in which the washer may be so mounted. When, as abovesuggestcd, the ar-" rangement is such that the head of the bushing engages the inner surface of the boxwall, the washer will be so located as to engage the outer surface thereof. It is apparent, however, that this relative arrangement may be reversed.
In the embodiment of the invention shown in Figs. 1 and 2, it will be noted that the shank 11 is of a length greater than the thickness of the wall 8, so that it extends some distance through the opening. In such a case the flange 15 of the washer must, of course, be of an internal diameter sutlicient to enable it to extend around the shank of the bushing, so that the end of the flange 15 may bear against the adjacent surface of wall 8.
In Figs. .3 and 4: I have illustrated the use of the same type of adapter in connection with a connector 16, which may be used when the conduit or cable has to make an angle in approaching the opening in wall 8. In such a case the neck 1 of the connector is joined to an elbow portion which is completed, in. the example shown, by a cover plate 17 which carries a clamping strip 18, adapted for use in connection with the opposite clamping portion 18 of the body of the connector. The bushing 9 and the washer 13, shown in this example, may be the same as the bushing and washer shown in the form of device illustrated in Figs. 1 and 2.
The modification shown in Fig. 5 differs from the form shown in Figs. 1 and 2 because of the fact that the bushing 9', shown in Fig. 5, is not provided with internal screw-threads. In the form shown in Fig. 5 the bushing is provided with a threaded opening through the head thereof through which is extended a screw 19 which may be screwed into binding engagement with the thread 2 on th neck 1 of the connector, when the bushing has been adjusted in position.
This figure also illustrates the use ofa bushing having a shank 11 which is of less length than the thickness of wall 8. In such a case the washer 13 need have no peripheral flange such as that shown in the other figures. \Vasher 13 may be simply a fiat washer, as shown slipped over the threads of neck 1 into engagement with shoulder 3, or otherwise secured in position on the connector, the external diameter of the washer being greater than that of the opening through wall 8, so that the outer portion of the forward face of the washer will bear against the outer surface of wall 8 when the parts are adjusted into position.
It will be understood that my invention is not limited strictly to the details of construction described but is as broad as is indicated by the accompanying claims.
What I claim is:
1. In connecting devices, in combination, a member to be secured in an opening in a wall, a bushing adapted to receive said member and having a reduced portion adapted to fit within said wall opening and having another portion adapted to abut against one side of the wall at the opening, an abutment. element on said member and abutting against the other side of said wall, said abutment element being recessed to permit said reduced portion of the bushing to extend through said opening, and means whereby said bushing may be secured adjustably on said member.
2. In connecting devices, the combination of a connector having a neck and a peripheral shoulder, a washer mounted directly upon said neck and adapted to bear against said shoulder, and a bushing mounted directly upon said neck and having a head and mamas a shank of less diameter than that of said head, said shank being adapted to seat within an opening in a wall with said head engagin one side of said Wall about the opening, sai
washer having a peripheral flange of an internal diameter greater than the external diameter of said shank, whereby the end of said flange may'bear against the other side of said Wall about the opening, and means for securing said bushing upon said neck in adjusted position.
3. In connecting devices the combination With a connector having a neck, of a Washer and a bushing, both mounted directly on said neck, said bushing having a radially extending head and a reduced shank extending at right angles to said head from the inner edge thereof, and said Washer having a radial portien and a portion extending at right angles to said ra ial portion at the outer edge thereof and radially overlapping said shank, and means for ad usting said Washer and bushing on said'neck relatively to each a other.
This specification signed and witnessed this 4th day of Novemher, 1920.
ADN MGTRIE. Witnesses:
Ramona P. HARRIsoN, Gnonen C. Tnomas, Jr.