US76317A - Improvement in suspensiqn-speings fob lamps - Google Patents

Description

J. A. EV ARTS. Suspension-Spring fdr'lampi Patented April 7, 1868.

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JOHN EVA HTS, OF WEST MER-IDEN, CONNECTICUT, ASSIGNCR TO BRADLEY AND HUBBARD,- OFSAME PLACE.

Letters Patent N0. 76,317, dated April 7,1868.

IMPROVEMENT IN SUSPENSION-SPRINGS 'FOB. LAMPS.

TO ALL WHOM IT MAY CONCERN:

Be it known that I, JOHN A. EVARTS, of West Meridcn, in the county of New Haven, and State of Connec-- ticut, have invented a new Improvement in Suspension-Spring; and I do hereby declare the following, when taken in connection with'The accompanying drawings, and the letters of reference marked thereon, to be a full, clear, and enact description of the same, and which said drawings constitute part of this specification, and represeut, in- I v I Figure 1, a side view, 1

Figure 2 an edge view, and in Figure 3 a verticalcentral section. p

This invention relates to an improvement in suspending chandeliers, or other things which it is desired to adjust to different elevations, and consists in the peculiar arrangeme'ntof a spring, whereby the thing suspended is held at any desired point of suspension. v

In order to the better understanding of my invention, as well as to enable others to construct the same, I will proceed to a description thereof as illustrated in the accompanying drawings. I I A is a cylinder, arranged upon a bearing, B, between two supports C,the said two supports joined attheir two ends by a connection, D, to the upper one, D, of which a hook, E, is fixed, and to the lower one, D, is fixed a friction roll, as seen in fig. 3. Within the cylinder A is arranged a coil spring, F, (see fig. 3,) attached to the bearing 13 and to the cylinder A, so that the spring reacts to revolve the cylinder in like manner as clock or watch-springs, and is wound up to the necessary tension as ordinary clock-springs, and then held by a pawl and ratchet,a. To the cylinder A is attached a metallic or other ribbon or band, G, or may he a cord or chain which passes up over a friction-roll, H, thence down over the friction-roll upon the lower connection D, as seen in figi 3, and to the lower end is attached a hook, I, or other contrivance for attaching the thing to be suspended.

The friction-roll His provided with a ratchet, b, and a pawl, d, arranged so that when held into the ratchet, as seen in fig. 1, the roll H cannot move, but when the pawl cZ' is drawn away, as denoted in red, then the roll H will revolve. r

The spring being attached to that position from which the thing is to be suspended, the said thing is attached to the lower end of the ribbon G, (the tension of the spring being sufiieient to nearly retain the thing'at any point of suspension,) and the thing may be drawn down to any point of suspension within the range of the spring.

Passing, as the band does, over the roll H, and down overthe lower roll, the upper rollH is prevented fromturning by the pawl and ratchet upon its end, A sufficient friction is created to prevent the descent of the thing suspended, and this materially aids the spring in so suspending, but when the thing suspended is raised, then the roll H revolves, and the full force of the spring recoils to draw up the thing suspended, and when so raised, the pawl 65 stops the return of the roll H, andprevents the descent, I i

If (as in many cases it would be) the frictionof the roll Hshould be too great, a cord or chain, as denoted in blue, fig. 1, may be attached to the pawl cl, so that when desirable to lower the thing suspended, draw the pawl away, as denoted in red, fig. 1, and the friction is removed, and, when lowered to the desired point, permits the pawl d to fall into the ratchet'b, and'the friction is again applied and the deseent stopped.

* .If for heavy weights, it is better that the pawl should operatein a ratchet formed upon or attached'directly' to the cylinder A, so as-to positively arrest the movement of the spring. In this case it is necessary that the pawl be raised from the ratchet in order-to draw down the thing suspended, andinsuch ease tlie upper friction. rollH maybe dispensed with, retaining only the lower roll. I

And again, for light weights, or when the springs may be prepared for certain specified purposes, the spring L" the connection D, the lower roll affording all the friction that is necessary, the spring being graduated to the weight of the thing suspended. l

The ribbon G may, if preferred, be'iattached to the end of the spring, andwind up upon the spring without may be made suflicien'tly strong to dispense with both ratchet'and upper roll, retaining only. the lower roll upon the intervention of the cylinder, but such an arrangement has no advantages, but many disadvantages, over' thecylinder. I I

I do not wish to be understood as broadly claiming suspending lamps or other articles, so as to be drawn up or held in vany given position by means of a coilspring, as this is common and well known, but in such commen and well-known devices the spring is attached to a cone, and a cord, or-similar device, caused to be pound on to the said come by the reaction of the spring. I

Having thus fully described my invention, what I claim as new and useful, and desire to secure by Letters Patent, is I 1. -'.l.he combination of the coil spring F with the band G and lower friction-roll D, substantially as specified. 2. Thecombiuationof the coil spring F, the band G, and the ratchet, whether the ratchet be ap plied directly to the cylinder 'Ador to the friction-roll, substantially as described.

V 3. Thecombination of the coil spring F, the band G, and the upper and lower friction-rolls H and D, substantially as described. I i I 4. The combination of the coil spring F, the band G, the two rolls Band D, with the ratchet and pawl,

constructed and arranged substantially as set forth. 7 I I I I JOHN 'A; EVARTS.

Witnesses JOHN E. EABLE, A. J. TIBBITs.

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