US321545A - Lamp-support - Google Patents

Description

(Nomoaex.) Y J. SPILLINGER.

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iiniTnn dTaTns Farrar @Three JOSEPH SPILLINGEB, OF LANCASTER, PENNSYLVANIA.

LAMP-SUPPORT.

PEGIF-TG e, I @h forming part of Letters Patent No. 321,545, dated .uly 17, 1885.

Application filed January i9, 1884.

To @ZZ whom, t may concern:

Be it known that I, Jessen SPILLINGER, a citizen of the United States, residing at Lancaster, in the county of Lancaster and State of Bennsylvania, have invented certain new and useful Improvements in LampASupports; and I do hereby declare the following to be a full, clear, and enact description of the invention, such as will enable others skilled inthe artto which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or gures of reference marked thereon, which form a part of this specification.

This invention relates to lamp-brackets of the extensible kind; and it consists, partly, in certain devices for regulating the longitudinal adjustment of the horizontal arm, partly in certain devices for holding said arms to the vertical part of the bracket and regulating its axial adjustment, and'nallyin the bracket as a whole, all substantially as hereinafter set forth.

In the accompanying drawings,Figure l represents an elevation of my improved bracket, the vertical standard being partly broken away to show the fastening-screw and the groovcd shank into which it works. Fig. 2 represents a detail view of the outer section of the horizontal bar, taken from the opposite side. Fig. 3 represents a detail perspective of the shanks from below.

A designates a vertical standard, preferably of cast metal, having a base, A, adapted to rest upon and be attached to a shelf or other suitable support. In the top of this standard there is a deep cylindrical socket, and the wall of this, a short distance above the bottom, is screw-tapped to receive a milled screw, B, the

operative part of which is long enough to eX- tend sonic distance into said socket.

C designates the inner section of the horizontal la1npholding arm, and C the outer section thereof, these sections being, respect ively7 provided with registering longitudinal slots c c', and held together by screws, as hereinafter described. The inner section, C, is provided at its inner end with a hub, d,which is surmounted by an ornamental dat handle, d, whereby said bar maybe turned on its axis from behind. This axis consists of a cylindrical shank, I), corresponding in length and (No model.)

diameter to the socket in the top of standard A, and having formed init abroad and deep annular groove, D, at such a height from its lower end as to receive the end of screw B, aforesaid. The lower side of the groove is a broad shoulder, which, when the screw is turned fully home, will be in contact with sai d 'screwto such an extent as will eiieectually prevent the said shank from being lifted in its socket. The lower end of said shank is rounded to form a convex bearing-surface, which turns with the least possible friction on the bottom of the socket. Theshank, drum, and handle,.or ornamental top piece, aforesaid, are preferably cast in one piece with the inner section, C, of the arm. By loosening screw' B, I leave the shank and arm free to turn to the right or the left, so as to present said arm at any desired-angle and hold the lamp where it may be needed. The screw I3Y is then tightened aga-in, and the lamp thereby secured in its newlocation. The lamp may, however, he still too near the person using it, or too far from him, or it may be desirable, on other accounts, to shorten or extend the horizontal arm. To allow this I provide the sections C G with the longitudinal slots c c, before alluded to, and make use of screws E F, the former of which passes through slot c of section (l and screws into section C', while the latter, on the opposite side, passes through slot c' of section G and screws into section C. These screws are arranged, respectively, near the opposite ends of their respective slots, and they serve as stops to limit the extension of the arm by engaging with the material at the outer end ot' slot c and the inner end of slot c', respectively. In like manner they prevent the outer section, C', from being moved inward too far. They are the only means of attachment of said outer bar or section, and when they are unscrewed it falls away from the inner bar or section, G, or may be removed by hand. These screws are loosened a little to allow the extension or contraction of said arm. This is effected by hand or in any contightening described.

IOO

preferably a thumb-screw, such as shown at E in the drawings. rIhe sections C C are Hatsided, parallel, and of equal width, and the heads of the screws E F overlap the edges of the slots, so that it is not possible for the outer section, C', to turn (allowing the lamp to tilt on either side) without displacing or breaking said screws, and the construction of the bars or sections above stated lessens the danger of that.

I am aware that it is not new to construct a lamp-support with an extensible horizontal arm consisting of an inner tubular or deeplysocketed section, an outer section having a rod which enters such socket, and a screw which works through the wall of said socket against the periphery of said rod; but it must be obvious that such a construction is much less reliable than mine for holding` the lamp upright, and much more likely to bend or break.

I am also aware that it is not new to use a standard having a cylindrical socket with a horizontal separate arm having a cylindrical ungrooved rod or shank which turns therein, a screw working through the wall of said socket against said rod or shank, and another screw working downward upon the top of the shank or rod, the former screw serving to allow vertical adjustment and the latter to allow the radial adjustment of the arm. In such a construction,however, there are two parts more than I use, the shank is held in the socket by friction only and not positively locked, and

' other details differ as stated.

I do not claim either of the above combina- 3 5 tions of devices, nor both of them together.

It is obvious that my shank is capable of vertical adjustment in its socket by withdrawing screw B from its groove and afterward clamping it by screwing against the periphery of said shank when the latter has been raised to the desired extent. Of course the groovemay be at any part of said shank. My screw B is thus adapted to do duty either as a frictional clamping device or as a positive locking device. In the former case it governs vertical adjustment as well as axial; in the latter it has nothing to do with vertical adjustment, except to prevent it, but secures the parts much more satisfactorily.

Having thus described my invention,what I claim as new, and desire to secure by Letters Patent, is-

The hub d, to which the extensible lampsupporting arm is attached, and which is provided with the downwardly-extending stem D, having an annular groove, D', in combination with a hollow standard, A,which receives said stem and supports said hub, and a screw, B, which works through the wall of said standard and into the groove of said stem, substantially as set forth.

In testimony whereof I affix my signature in presence of two witnesses. A

JOSEPH SPILLINGER.

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Witnesses:

H. R. McCoNoMY, ANTHONY IsKE.

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