US2288108A - Electrical conductor support - Google Patents

Description

June 30, 1942. c. ROLL ELECTRICAL CONDUCTOR SUPPORT Filed March 15, 1941 gaf l ROZZ Patented June 30, 1942 ELECTRICAL CONDUCTQR SUPPORT c n R 11, Union, is.

J.,assignor.to The Singer Manufacturing Company,

Elizabeth, N. J., a

corporation of New Jersey Application March 15, 1941, Serial No. 383,473 1 Claim. (01. 287-78) This invention relates to electrical conductor supports and particularly to the type which provides a tubular staff carried by a fixed support having a flexible electrical conductor cord passing through and guided by the staff for connecting an electric iron or other portable electric device to an electric supply terminal.

More specifically, this invention is an improvement over the electrical conductor sup-port shown and described in the patent to W. O. Langille, No. 2,214,696, dated September 10, 1940.

The prior art sleeve, exemplified by the cou pling ferrule shown and described in the aforesaid patent, while satisfactory in many respects, requires a nicety of fit that imposes such tolerance limitation on the interfitting parts as to result in high production cost. Further, no provision has been made in the prior art device for compensating the natural wear of the inter-engaging parts, nor is the device adaptable to connect elements having any considerable difference in diameter.

It is an object of this invention to provide a connecting sleeve for an electrical conductor cord support, which is an improvement over the prior art in that it provides resilient clamping means for joining separable sections thereby obviating the need for close tolerances to maintain a firm fit.

Another object of this invention is to provide an-improved connecting sleeve for a conductor cord support, in which the normal wear of the parts is taken up by the natural resilient action of the sleeve itself.

A further object of this invention is to provide a connecting sleeve of the type disclosed in which the frictional grip exerted by one end thereof is, to a sufiicient degree, independent of the frictional grip of the other end, whereby axially separable sections differing considerably in diameter may be detachably coupled together.

It is another object of this invention to provide an improved resilient sleeve member which is simple, inexpensive and rugged, and afiords a quick, convenient and positive means for detachably joining the separable sections of a collapsible conductor support for an electric fiatiron.

With the above and other objects in view, as will hereinafter appear, the invention comprises the arrangement of parts hereinafter set forth and illustrated in the accompanying drawing of a preferred embodiment of the invention, from which the several features of the invention and the invention.

the advantages attained thereby will be readily understood by those skilled in the art.

The several features of the present invention will be clearly understood from the following detailed description and accompanying drawing in which Fig. 1 is a side elevation of an ironing board with my improved conductor-support secured thereto, the support being shown in one position in full lines and'parts of the support being shown in a different position by dotted lines.

Fig. 2 is an enlarged broken side elevation of the conductor support having its sections. coupled together by an external sleeve'embodying Fig. 3 is a side elevation showing, in full lines, the conductor support collapsed toplace the separable sections thereof side by side, and, in dotted lines, the conductor support in coupled position.

Fig. 4 is an enlarged elevation of the improved sleeve member. V

Fig. 5 is an enlarged vertical elevation, partly in section, showing the conductor-support elements coupled by the external sleeve.

Fig. 6 is a transverse section on the line 68 of Fig. 5. I

Fig. 7 is a plan view showing the blank from which the sleeve is formed.

Fig. 8 is a transverse section on the line 8-8 of Fig. 2.

In the embodiment illustrated, my improved conductor support comprises a resilient tubular upright staff I, which guards, guides and keeps taut a flexible electrical conductor cord 2, carried within said staff, for connecting an electric iron 3 or other portable eletric appliance to an electric supply terminal. I

The staff I is carried, at its lower end, by a bracket 6 which may be secured to an ironing board 5, or other support, said staff being normally upright but resiliently deflectible at its upper end whereby to maintain the conductor cord 2 taut by taking up slack therein as the electric iron 3 is moved back and forth upon the ironing board 5.

The bracket 6 is formed with jaws 4 which 00- operate with the clamping screw 1 to fasten saidv bracket in place on the ironing board. The stafi I I has its lower end fastened to the bracket 6 by being capped by a metal thimble 8 which fits within a tubular socket 9, spot-welded to the inclined side of the bracket 6. The thimble 8 has its upper edge I0 bent outwardly to engage the upper edge of the socket 9 and its lower edge ll bent inwardly to receive an insulated wearing bushing l2.

By retracting the thimble 8 from the socket 9 and slipping the conductor cord 2 through an axial slot I3 in the wall of the socket 9, as shown best in Fig. 8, the staff I may be entirely detached and removed from the bracket 6.

The electrical conductor cord 2 is provided with a detachable terminal connector M for connecting to an electrical supply terminal such as a wall outlet and with a detachable connector l5 for attaching to the electric iron 3 or other electrical appliance.

The staff I is jointed at the middle by a detachable coupling sleeve IE to make it separable into an upper longitudinal section I! and a similar lower longitudinal section l8. Each of these sections comprises a tubular helical spring wire sheath having lateral resiliency whereby said staff will bend to yield additional conductor cord 2 when and in the direction needed and, at the same time, exert sufiicient restoring force to take all slack out of the cord and prevent kinking thereof.

The detachable coupling sleeve I6 is formed from spring sheet-metal and comprises a cylindrical tube having a longitudinal slit 19 along one side and a circumferential transverse slot 20 intersecting said slit at a point midway between the ends of the tube. This construction provides springy tubular sections or resilient lips on both sides of the transverse slot whereby each section may yield independently of the other to grip the separable sections l1 and H3 in frictional engagement whereby to join them into the integral staff-like structure I. The internal upsprung diameter of the coupling sleeve 16 is less than the external diameter of the separable sections l1 and l8 to insure that the sleeve yields and is tensioned inwardly against the separable sections when the parts are fitted together.

The springy sections yield radially of the sleeve to provide diametrical resilience, but the sleeve is stiff enough to afford a rigid joint to hold the separable sections joined as a single integral resilient staff.

A centering dimple 2|, pressed radially inwardly into the wall of the sleeve I6 at a point diametrically opposite the transverse intersecting slot 26, serves as a stop to limit the depth to which the separable sections IT and I8, may be inserted within the sleeve l6, as is best shown in Figs. 5 and 6.

The sleeve blank 22, Fig. '7, is punched from fiat sheet metal stock and contains the notches 23 which, when the blank is formed, become the single transverse slot 20. The dimple 2| is pressed in during the forming operation.

It is to be understood that the resilient lips formed by the longitudinal slit and the transverse slot provide flexible gripping elements for the sleeve l6 which yield radially independently of one another to adapt said sleeve to receive, in frictional socket-engagement, pairs of separable elements I! and IS, the diameters of which vary both absolutely and relatively.

This radial resiliency has a further economy in taking up much of the natural diametrical wear of the engaging parts, thereby extending the useful life of the device and insuring a better fit over a longer time.

A convenience feature is also provided by this sleeve construction due to the fact that the longitudinal slit affords a view of the interior of the sleeve whereby it may be readily and definitely ascertained when the separable sections have been fitted therein to their full allowable depth to thereby utilize the entire supporting power of the sleeve at all times.

It is evident, of course, that the connecting sleeve requires no fastening means, and is interchangeable end for end, which facilitates the initial assembly and general use of the conductor supporting device.

When the staff is disjointed, as shown in Fig. 3, by detaching the coupling sleeve I6 from either section I! or 18, the elements of the conductor support remain strung upon the conductor cord thus keeping said support intact and the elements thereof in proper relative position for quick and easy coupling when its service is again required. In the position shown in Fig. 3, the stafi sections folded side by side afford a natural support for winding on the unsheathed portion of the conducting cord, thus providing a compact bundle for storage or transportation.

The sleeve construction herein illustrated and described is particularly desirable from a production standpoint in that no so-called machine finishing is required and, as there are no turned parts, the device may be substantially entirely manufactured on a punch press.

The invention which is described herein may be embodied in various ways which Will be within thescope thereof as defined by the appended claim.

Having thus set forth the nature of the invention what I claim herein is:

In an electrical conductor support having a resiliently deflectible stafi member composed of generally cylindrical separable sections formed from helical-wound wire, means to connect said sections comprising a tubular connecting sleeve formed with a longitudinal dividing slit and a transverse slot intersecting said slit to provide at the ends of said sleeve independently-yielding cylindrical terminal portions having lengths greater than and unsprung internal diameters less than the external diameters of said separable sections.

CARL ROLL.

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