US1470774A - Portable lamp - Google Patents

Description

W. J. SPE'NCE PORTABLE LAMP Filepl May 15, 1922 Z0 Patented Got. ifi, 1%23}.

' nwirsn WILLI M'J. srnivon, or LYNN, nrnssaonusnrrs.

ron'reetn LAMB.

i Application filed. May 15,

To aZZ whom it may concern:

Be it known that I, VVILLIAM J. Srnnon,

a subject of the King of Great Britain, and a resident of Lynn, Massachusetos, have in- 5 vented sin-improvement in Portable Lamps,

of which the following description, in connection with the accompanying drawings, is a SpGC1fiCatlOI1,,l1k8 letters'on the drawings I 7 appear as the description of the lnventlon representing like parts.

Mypresent invention relates to lighting fixtures and more particularly to a portable lighting fixture orlamp base of the type ordinarily known as desk or reading lamps.

In the construction of this particular class of device, dirficulty has been experienced in so devising the swivel portions that thesame may be readily'adjusted with a minimum eiiort and have theparts'remain in their adjusted position. I have obviated 550 the objectionable features of prior devices of this character and have devised a swivel joint for the lower end of the goose-neck which is relatively free to move for the purpose of adjusting the goose-necln'and in any adjusted position, will remain there without danger of accidental displacement. Again, I have arranged the goose-neck to be constructed of relatively light. commercial hollow tubing and have formed a socket or lamp 0 holding end integral with the goose-neck .itself, this construction reducing .the number of'parts heretofore deemed necessary in thisclass of apparatus and the resultant structure is simple in character, neat in appearance, and eiiicient in operation. My irn proved form of swiveljoint for use in attaching'the lower end of the goose-neck to the base properor the device is arranged to,

hold the goose-neck in position under a constant spring tension and this tension maybe adjusted as desired, and when once adjusted, will remain in this condition indefinitely.

I find it possible to adjustthe tension of this portion" of the apparatus during the proo 2 ess of manufacture and therefore provide no means, readily accessible to the user, for

adjusting the tension of the joint'after it leaves the factory, ithaving been found that the constant adjustment of this joint by the user'in prior devices resulted in rapid de-' terioration of the device. adjustment was necessary in prior apparatus because of the defective form of swivel device employed.

The particular object of my invention,

swivel joint applicable for use'in devices of Such continual 1822. Serial no. 561,075.

base. Another object is an improved form of this character.

Other objects and novel features of the construction and arrangement of parts of the device constituting my invention will 4: is a section on the line of' liig; 1; and

Fig.5 is asection on the line 5-5 of Fig. i

1, but showinga slightly modified form'of swivel joint. 1

Referring to the drawings, 10 designates a base of any suitable size and contourhaving upwardly extending therefrom lugs 11 and 12 spaced apart from each other a suitable distance to receive the lower end of a goose-neck, 1& and said base and lugs may be of any suitable metal. or material and may be as plain or ornamental as may be de- 35 sired. Each lug 11 and 12 is provided with a hole 13. these holes'fbeingot any suitable size andare in alinement with each other theafies ofthe holes being horizontal. Fiting within each hole 13 is a cylindrical mem- 99 ber 1501 a width equal to'the widthof the lugs 11 and 12 and prevented from rotation in the holes 13 by pins 35. This cylindrical i member is provided witha plurality of slots of saw cuts 16 on either side thereof and these slots or saw cutsextend a substantial distance beyond the center of such member. These members 15 are drilled to receive a rod 17' threaded at each end to receive collars 18 and these collars are provided with 190 holes or depressions 19 toreceive a'spanner for adjustnig purposes.

The goose-neck 14: is preferably formed of commercial square brass tubing and may be of any conventionalform, the upper end be- I this pivotal mounting: being comprised'of a W or seat upon the ears 11 and 12.

- sembled position.

joint the adjustment is made at the factory shown) 'near the bottom where it may be provided with the usual plug for attachment to a source of current.

It will be obvious from the above that the collars18 may be utilized to force the members 15 toward or from each other thereby varying the friction between them and the lower end of the goose-neck 14. Also said collars 18 are compressible until they contact Thus the tension exerted by said members 15' on the lower end of the goose-neck 14- is variably adjusted. The position of the goose ncckis, and parts attached to the upper end thereof with respect to base 10, maybe varied at will and the spring tension exertedon the lower end 'of the goose-neck I l by the inemhers 15 insures that such goose-neck 14 will be securely held in any position towhich the same may have been moved while vet a-llowing proper adjustment thereof. Further. the position of the socket 26 and bulb 27, may be variedwvith respect to the gooseneclr 14 by use of the wing nut 24 on the threaded screw 23.

Referring to Fig. 5. illustrating a modification ofthe swivel joint above described, 11 and 12 desi nate the spaced ears and l t the-lower end of the goose-neck 14:,-Wlll.1

,in the holes 13 of the ears'aud in engagement with the sidewalls of the goose-neck 14 are metallic washers 29. In said holes 13, and spaced apart from the washers 29 by preferably ibre washers 30. are other metal lie washers 31 secured against rotation in the holes13 by pins 32. Againstthe outer faces of the ears l1 andj12 are collars 33, the col-' lars 33-and washers 29, 80, and 81 and the lower end of the goose-neck 1% being'pen. forated to receive a shatt 3e, this shaft being preferably headed over or riveted to se-' cure theconstruction justdescribed in as In this form of swivel by a skilled workman, and once made, has

been found to last throughout the life of the device thereby rendering unnecessary, and preventing, any tamperin with the device by the user;

While I have necessarily shown and de scribed the preferred embodiment of my invention in detail, it is understood that I may vary the details of the construction and arrangement of partsshown within wide limits without departing from the spirit of the invention.

Having thus described my invention, what I claim as new is:

1. In an improved lamp base, the com- .bination of a base, a pair of cars spaced apart from each Gamma extending'upwardly therefrom, alined perforations in said ears split spring members in said pertorations, a goose-neck, a threaded shaft passing through the lower end of the gooseneck and through the split spring members, and means for adjusting the pressure on the split spring members for varying the tension exerted thereby on the gooseneck.

2. In an improved lamp base, the combi nation of a base, a pair of ears spaced apart from each other and extending upwardly from the base. alined perforationsan said perforations, means for preventing rotation of said members in said perforations, a goose-neck, a threaded shaft passing through the lowerend of the goose-neck and through the split spring members, and means for ad'- justing the pressure on the split spring members for varying the tension exerted thereby on the gooseaieclr.

3. In an improved lamp base, the combination of a base. a pair of ears extending upwardly therefrom and spaced apart from each other and provided with alined perforations whose axes arehorizontal, trio tion members in said perforations. a shaft passingthrough said friction members, a

goosemeckpivotallymounted on said shaft and in engagement on opposite faces with the friction members, a fork formed integral with, and at the upper end of. said gooseneck, a yoke pivotallyand ad ustably mounted at the-extremity of said fork, and

, a lightingdevice attached to said yoke.

In testimony whereof. I have signed my name to this specificatlon.

' WILLIAM J. srn von.

ears, split spring members fitting in said

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