US290618A - Assigxoe to edwaed - Google Patents

Description

Patented Dee. 18, 1883.

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H. 0. WINSLQW. EXTENSION GHANDLIER.

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HENRY O. \VINSLOVV, OF MERIDEN, CONNECTICUT, ASSIGNOR TO EDYVARD MILLER 85 CO., OF SAME PLACE.

EXTENSION-CHANDELIER.

SPECIFICATION forming part of Letters Patent No. 290,618, dated December 18, 1883,

Application filed October 8,1883.

To all whom it may concern,.-

Be it known that I, HENRY O. VINsLow,

of Meriden, in the county of New Haven and State of Connecticut, have invented a new Improvement in Extension-Chandeliers, and I do hereby declare the following, when taken in connection with accompanying drawings and the letters of reference marked thereon, to be a full, clear, and exact description of the same,

and which said drawings constitute part of this specification, and represent, in-

Figure l, a sectional side view; Fig. 2, a sectional side View at right angles to Figi, Fig. 3, a transverse section on line m x.

This invention relates to an improvement in that class of chandeliers which are suspended from the ceiling by spring or weight, and so that the chandelier may be drawn down or supported at different elevations. This class 2O of fixtures, as usually constructed, consist of an outer tube secured by one end to the ceiling, and so as to hang vertically, a tube within said outer tube, movable vertically, and which carries the arms or lamp-supports at the bottom. This inner tube is sustained by a spring or weight from above, the power of which substantially counterbalances the movable part of the chandelier. In order to avoid accidents in this class of fixtures, it is necessary to lock the telescopic tubes at whatever point of elevation it is desired to arrange the lamps. It is to this clamping device that my invention particularly relates and it consists in a pair of clamps, arranged diametrically opposite each other in openings in the inner tube, combined with a screw, the one end threaded right hand and the other left hand, working in correspondingly-threaded holes in the two clamps, the screw provided with a 4o pinion between the clamps, a vertically-sliding toothed rack working into said pinions, the lifting device attached to one end of the rack, whereby the lifting-power will cause the rack to rise and turn the said right-and-lefthand-threaded screw to respectively throw said clamps outward and against the inner surface of the stationary tube, whereby sufficient friction will be created to sustain the inner tube at any position to which it may be set, and as 5o more fully hereinafter described.

(No model.)

A represents the outer vertical tube, which extends upward, and is secured at any desired point, so as to hang in avertical position, and in the usual manner for this class of fixtures.

Vithin the tube A is a tube, B, arranged to move freely up and down within the outer tube. This inner tube carries the center C or support for the arms in the usual manner for chandeliers.

In diametrically-opposite sides of the tube 6o B vertical slots a are made, in which stand the two clamping-pieces D E, their outer surface corresponding substantially to the inner surface ofthe outer tube. The slotin theinnertube, in which the clamps set, prevents any movement of the clamping-pieces, except in a radial directionthat is, toward and from each other. One of these clamps, D, has a transverse hole threaded for a :right-hand screw. The other, E, has a corresponding hole threaded 7@ for va left-hand screw. Into these holes, respectively, a screw, F, is introduced, this screw being correspondingly threaded.

Between the clamping-pieces on the screw E is a toothed pinion, G. By turning this pinion in one direction the two clamps will be forced outward or from each other, because of the oppositely-cut threads, and in the reverse direction will draw the clamps inward or toward each other. 3o

Within the inner tube is avertical rack, II, toothed, corresponding to the pinion G, and arranged so that the teeth of the rack work into the teeth of the pinion, as seen in Fig. 2. The upper end, I, of this rack, above the clamp- 8 5 ing-pieces, is constructed to substantially fill the tube, and the lower end, L, below the clamps, is constructed in like manner. These two ends I L serve to guide the rack and hold it in its proper relative position to the pinion, the two ends I L being freely movable up and down within the inner tube.

To the upper end the lifting attachment is secured, as by a hook, M, or any of the usual methods of attaching the lifting device to the clamping mechanism. This lifting mechanism is not shown in the drawings, and is too well known to require description. Fromthe lower end, L, a cord, chain, or other device, N, eX- tends into some convenient position where a roo person desiring to adj ust the fixture may apply power to pull down the rack. As here represented, this is done by connecting the cord N to a lever, P, near the bottom of the chandelier. The direction of the thread on the screw F is such, as shown, that the lifting device pulling upward and the weight of the chandelier downward will cause the rotation ofthe screw to throw the clamps D E outward and into frictional engagement with the inner surface of the outer tube, and with sufficient force to hold them in such engagement and to prevent accidental movement of the chandelier.

To adjust the chandelier from such position the person takes hold of the lever l) with the lingers of the hand, and,with the thumb upon the bottom or any convenient support, draws down upon the lever F, to overcome the lifting-power and draw down the rack H, as seen in broken lines, Fig. l. rlhis drawing down or" the rack H turns the screw F in the reverse direction and draws the clamping-pieces from engagement with the outer tube, so that while these pieces are so held the person operating the lever l? may raise or lower the chandelier to any desired position; and then releasing the lever P the lifting-power is again applied to the rack H to draw it upward, and which upward movement turns the screw F to force the clamps again into engagement with the inner tube. By this construction the holdingfriction is produced between the clamps and the outer tube, and without forcing the inner tube into contact with the outer tube, as in many clamping devices, and which is objectionable for obvious reasons. Again, by this construction the two clamping devices are oppositely and equally moved, and the clampingpower, owing to the employment of the screw, is so great that the clamping-pieces themselves may have a very small area of bearing-surface.

I claim- The combination of the outer stationary and inner movable tubes, the clamping-pieces D E, diametrically opposite each other, in corresponding slots in the inner tube, the rightand-left-hand-threaded screw F, working in the correspondingly-threaded holes in the said clamping-pieces D E, the said screw carrying a pinion, G, and the vertical rack H, one end tted for connection with thelifting device above and the other for connection with a pullingdown device below, substantially as described.

HENRY O. VINSLOV.

Titnessesz BENJ. C. KENNARD, Jos. C. DARLE.

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