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Publication numberUS1192150 A
Publication typeGrant
Publication dateJul 25, 1916
Filing dateDec 10, 1914
Priority dateDec 10, 1914
Publication numberUS 1192150 A, US 1192150A, US-A-1192150, US1192150 A, US1192150A
InventorsErnest G Appleton
Original AssigneeChicago Fuse Mfg Company
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 1192150 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)




Patented July 25, 1916.



To all whom it may concern:

Be it known that I, ERNEST G. APPLE-TON, acitizen of the United States, residing at Chicago, inthe county of Cook and State of Illinois, have made certain new and useful Improvements in Connectors, of whichthe cyhndrical form, thereby providing'a longifollowing is a specification. 7

This invention relates to an improved connector for securing various electric conduits including armored cable, flexible metallic conduit, and rigid conduit, to outlet boxes, steel cabinets, or the like;

The object of the invention is to provide a connector which is simple in construction and cheap to manufacture, which may be quickly and easily applied to the cable-and c the box, and which chanical connection lprovides a strong methe box and also a superior electrical connection.

In the accompanying drawings, Figure 1 is a side elevational view partially in section showing a cable and a junction box secured together by a connector embodying the features of my invention. Figs. 2 and 3 are respectively a side and an end elevation of a thimble forming one element of the connector. Figs. 4 and 5 are respectively a side elevation and a transverse sectional view illustrating the clamp member of the connector. Fig. 6 is a sectional view illustrating a construction adapting the connector for association with openings in the box of larger diameter than the connector.

The preferred embodiment of the invention will be herein described in detail, without any intention, however, of limiting the invention to the precise details disclosed, except as specified in the appended claim.

In the drawings, A indicates a junction boxhaving the usual knock-out openings B which are originally closed by plugs C.

D indicates a flexible conduit.

The connector comprises a thimble 10 adapted to pass through a knock-out opening in the box, and a dual clamp .11, one end of which grips the said thimble and the other end of which grips the conduit. The

thimble 10 is provided at its inner end with a stop shoulder in the form of an annular flange 12 which lies along the inner face of the box wall around the-opening B. The thimble is also provided with an external nul r -oove 1 whi h li sal ng th ou e face of ..e b x wall when the thimble i in Specification of Letters Patent. i

etween the cable and Patented July 25, 1916..

Application filed December 10, 1914. Serial No. 876.393.

place. The thimble may be formed in different ways, one way being to roll a piece of sheet metal into cylindrical form with the edges abutting as seen at 14 in Figs. 2 and 3. The clamp 11, if desired, may also be formed from a single piece of sheet metal rolled into tudinal slot 15 running throughout its length. The inner end of the clamp is pref- C divided by atransverse-slot 17 into two independent clamping sections. Each of these sections is provided with a pair of approximately'parallel ears 18 at opposite sides of the slot 15, and each pair of cars is arranged to be drawn together by means of a screw 19 passing loosely through an opening 20 in one of the ears and threaded in an opening 21 in the other car. openings 20 and 21 are punched somewhat smaller than required and are then flanged out as at 22 to provide the'equivalent of a thicker metal.

In the operation of securing a cable or Preferably, these conduit in place, the thimble 10 is passed through the opening B from the inside of the box, the clamp 11 is passed over the thimble until the flange 16 seats in the groove 13, and the inner screw- 19 is tightened up to contract the inner section of the clamp upon the thimble. The cable D is now inserted into the outer end of the clamp, the end of the thimble 10 forming a stop shoulder against which the end of the cable abuts. The outer screw 19 is now tightened up to grip the cable. The shoulder or flange 12 on the thimble prevents the thimble from being pulled out of its opening. When the knock-out opening B in the box is of larger diameter than the connector, a pair 'of dished washers 23, shown in Fig. 6, is provided to fit around the thimble l0 and with in the knockout opening B, said washers in eflect constituting a continuation of the box wall. The operation of associating these washers with the other parts in securing a cable will be apparent and need not be described.

, It will be seen that my improved connector is simple in construction and cheap to manufacture, and that it may be quickly applied and forms a very strong connection for th cable or conduit.

I claim as my invention:

' A connector of he character described,

comprising a cylindrical thimble ada ted-t0 pass through .a box-0p .5

the wall at the ed e of said opening an having an externa annular groove posi- 30 clamp transversely slotted to provide two partially separated and-independently act mg clamp-sections, and longitudinally slot;

ening, the t imble aving a fiange atv itsinner end to engage, v

d vldmg an annular flange at its end a apted 2 tioned to lie adjacent to the outer face of' thimb the box wall, and a sheet-metal cylindrical V In the presence of said ears beingperforated, and means en- 1 gaging inthe' perioration for independently contracting said clamp-sections to grip sa d thimble and a cable respectively, one of sald clamp-sections having an inturned ed 6 proto en%age inther annular groove in said In testimony whereof, I hereunto set my hand the-pEresence of two witnesses.


WM. W. GEO. G-

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2479223 *Oct 28, 1947Aug 16, 1949Evans Gerald TNonmetallic sheath cable connector
US3341232 *Sep 9, 1966Sep 12, 1967United States Pipe FoundryPipe joint
US4620729 *Mar 28, 1985Nov 4, 1986Tru-Fit Mfg., Inc.Round pipe starter fitting
U.S. Classification285/154.3, D13/152
Cooperative ClassificationH02G3/0683