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Publication numberUS1321660 A
Publication typeGrant
Publication dateNov 11, 1919
Filing dateApr 5, 1919
Publication numberUS 1321660 A, US 1321660A, US-A-1321660, US1321660 A, US1321660A
InventorsD. F. Moriarty
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Lamp-cord-ad justing clamp
US 1321660 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)




1,321,660. Patented Nov. 11,1919.




Application filed April 5, 1919.

To all whom it may concern:

Be it known that I, DANIEL F. MoRiAR'rr, a citizen of the United States, and a resident of South Meriden, county of New Haven and State of Connecticut, have invented a new and Improved Lamp-Cord-Adjusting Clamp, of which the following is a full, clear, and exact description.

This invention relates to a lamp cord adjusting button. More particularly it relates to an adjusting clamp applicable to incandescent lamp cords for shortening or lengthening the lamp cord obviating the necessity of tying knots in the cord and otherwise damaging it.

Electric light lamp cords which usually depend from the ceiling of a room necessarily need to be shortened and lengthened out at times to make their use more convenient and prevent the electric light or fixture from becoming inconveniently in the way.

It is a purpose of my invention to provide a simple form of clamping device or adjusting button which may be mounted upon a lamp cord and left there indefinitely for the purpose of adjusting the length of the cord.

A constructional purpose of my invention is to provide a simple form of lamp cord or adjusting button comprising two separable clamping members held together by a screw and fitted with a yieldable spring means to prevent damage to the cord when the button or clamp is slipped or adjusted on said cord.

It is also a purpose of this invention to provide a clamp with the above utility characteristics which will be comparatively inexpensive to manufacture, simple in its application and incapable of getting out of order.

With the above and other objects in View the invention has relation to a certain shape and form of elements, and combination one with the other, and their mode of use. A description of the invention is had in the following specification, pointed out in the appended claims and illustrated in the accompanying drawings, wherein:

Figure 1 shows the adjusting clamp applied to a lamp cord.

Fig. 2 and Fig. 3 respectively illustrate the assembled clamp in side elevation and in end elevation.

Specification of Letters Patent.

Patented Nov. 11, 1919.

Serial No. 287,672.

Fig. A shows a cross sectional view of the clamp.

Figs. 5 and 6 show the two separable clamp jaws apart one from another.

Fig. 7 illustrates a modified form of clamp.

Figs. 8 and 9 illustrate end elevations of cord adjusting clamps provided with variously shaped cord receiving channels.

Fig. 10 shows a knurled thumb screw which may be used in clamping the two separable jaws together.

Referring more particularly to the draw ings, the numerals 1 and 2 respectively point out an upper and lower clamp jaw member. The clamp members are provided with a tongue 3 and groove 4 joinder means. The tongue and groove are adapted to register one with the other thus alining the clamp jaw members one with the other and in a correctly engaging relation. A tapped or screw threaded hole 5 is formed in the jaw member 2 and a clamp screw receiving bore 6 is formed in the other member. A clamp screw 7 is inserted in the bore and screw threaded into the tapped hole 5. The clamp jaw 1 is provided with a groove 8 out in the outer face of the jaw and adapted to receive a flat leaf spring 9 which is provided with ahole and placed upon the screw and thus retained in position within the slot. The base of the groove 8 is arcuate in contour as designated by the numeral 10. This leaves open space between the base of the groove and the surface of the spring. Cord receiving channels 11 are formed in the clamping device, and are preferably cylindrical in shape. Two of these channels or openings will be provided such that the lamp cord may be inserted in one, folded and looped down and passed back through the other. These holes or cord receiving openings will be enlarged at each end or countersunk in form thus beveling off and cutting away any shape edges which would tend to chafe or damage the cord. This particular construction is pointed out by the numeral 12 which points to the easy curved contour comprising a very large opening in the end of the clamp device and tapering down to the normal size of the cord openings 11. The above de scription covers the preferable form of the clamping device and shows the tongue and groove means formed parallel with the cord receiving holes. This insures simplicity and convenience in man'ufact'ure.

The Figs. 7 8 and 9 illustrate modified designs of this cord adjusting button or clamp. Fig. 7 shows the tongue and groove joinder means-formed in the clamping members transversely to the cord receiving holes. Figs. 8 and 9 illustrate different shapes and forms of cord receivingopenings. This will adapt the device to fit any standard-shapes of cords.

The knurled thumb'adjnsting clamp screw '7 ill-ustrated may be employed in preference to the screw shown in connection withthe illustratedclamp. This 'forlnof screw will :render it unnecessary to alwayshave a-screw driver on-hand to adjust the device.

After the rightflength of lamp cord is obta-ined the-screw will be screwed -downwardly into the jaw Qwhich brings the associate j aw members-tightly one against the other. The, leaf sp'ring 9- flexes sufficiently to prevent the cord from being unduly squeezed or damaged in case the clamp is too tightly appliedagainstthe cord. Thisspring will .also Vpermit the jaw -members to yield slightly one from the other thus enabling one'to -slip the clampalong the cord with out always unloosening the screw.

This form of cord-adjusting button or I clampingdevice is simple in operation and convenient-to apply and will not getout' of working order.

Having thus described my invention, what u I claim; asnew,-.and desire to secureby-Letters-Patent is r -1. A la/mp cordadjusting device compris- -i-ngin combination, two separable halves vjoined together, a clamp screw adapted to clamp the separable halves together, and a s ring cooperating with the screw for reneringthe separable halves yieldable one on the other so that the lamp cord may be slipped through the device.

2. In a lamp cord adjusting device, a pair of clamp jaws, said jaws fitted with tongue and groove joinder means, a flat leaf spring applied to one of the jaws, and a screw enclamping means of the characterdescribed for application to an incandescent lump cord for adjusting the length of said cord, a pair of clamp jaws provided with cord receiving openings and provided with tongue and groove joinder means, a groove formed in the outer surface of one of the clamp-jaws, aflat leaf spring placed in the groove, and

,a clamping screw engaging the leaf spring and the jaws for clamping said jaw members together against the yieldable spring action of the leaf spring.

5. In a lamp cord adjusting button or clamping means, a pair of clamp members with cord receiving openings which are counter-bored'and rounded out at the ends for protection tothe cord, tongue and groove joinder means, a groove formed in the face of one of the clamps, a clamp screw engaging the spring and the clamp j aws for clamping the jaw members together,


Copies -ofithis patent may be obtained tor -five cents each; by addressing'the Commissioner of Patents,

' Washington, D.- C.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2453432 *Mar 6, 1947Nov 9, 1948Crawford Door CoCable clamp
US3089210 *Apr 6, 1962May 14, 1963Ritter Charles ECord holder
US4754531 *Jun 19, 1987Jul 5, 1988Skyba Helmut KElastic tie down
US5273021 *Apr 15, 1991Dec 28, 1993Tepper Timothy TBowstring release device adjuster for archery
US6389655 *Jan 3, 2001May 21, 2002Denis E. LibeccoAdjustable elastic tie-down cord
US6842949 *May 19, 2003Jan 18, 2005Robert E. WarrenU-shaped wire rope clamp
US8302265 *Nov 8, 2010Nov 6, 2012Arlington Industries, Inc.Wire gripper for supporting an electrical box or suspended load
US20040231113 *May 19, 2003Nov 25, 2004Warren Robert E.U-shaped wire rope clamp
U.S. Classification24/135.00R, 24/129.00A
Cooperative ClassificationF16G11/06