US311649A - Dominique obespik de la - Google Patents

Description

(No Model.) 7

11.0. DE LA JEANNIERE.

AUTOMATIC SAFETY BRAKE FOE ELEVATORS AND HOISTS. v

No. 311,649. A Patented Feb. 3, 1885.

l Q E \Q Q WITNESSES: J INT/ZNTOR: V e A a r w By his .flttorneys,

Usirrs rnrns Aren't rrrcn.

DOMINIQUE CRESPIN DE LA JEANNIERE, OF PARIS, FRANCE.

AUTOMATIC SAFETY-BRAKE FOR ELEVATORS AND HOISTS.

SPECIFICATION forming part of Letters Patent No. 311,649, dated February 3, 1885.

Application filed September 20, 1884. (No model.) Patented in Belgium August 23, 1884, No. 66,1l0. and in Italy September 1, 1884,

T0 at whom it may concern:

Be it known that I, DOMINIQUE (JREsPIN on LA JEANNIERE, a citizen of the French Re public, and a resident of Paris, France, have invented certain Improvements in Automatic Safety-Brakes, of which the following is a specification.

My invention relates to an automatic safetybrake especially designed for elevators and hoists, but which is also applicable to automatically arresting any rectilinear movement of a car or body, whether its direction he horizontal, inclined, or vertical. It belongs to that class of automatic brakes wherein the resistance to the movement by the car or other object to be moved serves to hold the brake freed or out of engagement; but if the pulling strain be thrown off or relaxed, as by the breaking of the draft-rope, a spring sets the brake.

My invention consists in the mechanism and arrangement of parts whereby the automatic braking is effected, and this mechanism comprises brakejaws adapted to clamp on a stationary guide-rod or brakerod, ahd special means for operating said jaws when the draftrope breaks, all as will be particularly described hereinafter.

In the drawings, which serve to illustrate my invention, I have shown it as applied to an elevator or hoist, this being sufficient to illustrate its application to cars on inclined or horizontal tracks as well.

Figures 1 and 2 illustrate my invention in its preferred form, the former being a front and the latter a bottom view or plan. Figs. 3 and 4 illustrate a modification, the former being a front elevation, partly broken away,

and the latter a bottom view or plan, also partly broken away.

Referring first to Figs. 1 and 2, A represents an elevatorcar arranged in any ordinary elevator-shaftrepresented by B, for example-and provided with ahoisting-rope, (J. D D are ordinary stationary-guide-rods,which serve to guide the carin its reciprocating movement, and also serve as brake-rods, or rods on which the brake-jaws clamp. The hoistingrope O is not attached directly to the car A, but to a frame, E, comprising a cross bar or tie, a, which connects two side rods, 1) b, which XXXIv, 2-11.

gnide'rod to move freely between them. faces of the jaws may be roughened, if de play in keepers c on the sides of the car, and

are provided at their lower ends with brackets d d, on which rests a cross beam or sill, 6. These parts form the hoisting-frame E. The car A rests on a spring or springs, f, which are interposed between its bottom and the beam or sill c.

On the car A are bearing-brackets g 9, two at each side, in which are mounted rotatively shafts h h, each of which has right and left screwthreads formed on it, which engage female screws in two brake-jaws, i i. These jaws are in the nature of bars that extend across under the car above beam 6, and their clamping ends embrace the two guide-rods D D, as clearly shown. On the screw-shafts h are fixed pinionsjj, one on each shaft, and on the side rods, Z), of frame E are formed or secured racksk 70, which mesh with said pinions.

The operation is as follows: When the car is suspended properly,its weight serves to co mpress the springs f. This compression causes the car to descend a little in frame E, and, carrying pinionsj with it, to cause their partial rotation by reason of their engagement with racks It. The partial rotation of the screw-shafts it produced by this separates the jaws i of the brake far enough for them to stand clear of the guide-rods, or at least not to clamp on said rods, while at the same time they serve to guide the car on said rods.

The above-described condition is the normal one when the car is suspended from the hoisting -rope;butin case the said rope should break, then the springs f would be relieved of tension and would force down the suspendingframe E, and with it the racks 70. These would act to rotate the pinions j and screw-shafts h, and these would cause the clamp-jawsito forcibly clamp the guide rods and arrest the descentof the car. The movement of the brake-jaws need not be great, as it is only designed that they shall separate far enough to permit the The sired. The modification in Figs. 3 and 4 shows substantially the same construction, differing only in this, that a lever-nut takes the place of the rack and pinion device. The screw-shafts h are fixed in brackets g,secured to the bottom of the car. The brake-jawsi are in the form of lever-nuts the fulcrunis being on the guide-rods.

In the form illustrated in Figs. 1 and 2 the brake-jaws move up to the guide-rod in parallel planes or like the jaws of a parallel vise.

In Figs. 3 and'et the fulcrum-axis of the jaws is the same as in Figs. 1 and 2; but the jaws are not parallel in fact, but nearly so. In both, the brake-jaws serve to guide the car in its movement normally, and in case of the accidental breaking oft he hoisting-rope the brakejaws act frictionally and do not stop the car suddenly, as does the well known safety ratchet device. The power of the brake is of course dependent on the tension of springf; but a comparatively lght spring will serve, as its power is multiplied by the screw and rack and pinion.

I am aware that friction safety-brakes have beforebeen proposed for elevators, and that such have been constructed to besetby a spring when the hoisting-rope breaks. Therefore I do not claim this, broadly.

I. am also aware that screws have been used or proposed to be used for setting friction safety-brakes on elevators, said screws being adapted to be rotated so as to set the brakes by means of the resistance offered by the rapid upward movement ofa packed weight in a shaft when the car descends with unusual velocity. This device may operate to set the brakes when the hoisting'rope is under full tension and unbroken.

In my brake the speed with which the car descends does not control the operation of the brake, and the latter is set instantly when the hoisting-rope is severed.

In the device just referred to the rapid descent of the car is necessary to the operation of the brake.

Having thus described my invention, I clai1n 1. The combination, with a car, A, its hoisting-frame E, hoisting-rope O, and springsf, of

the screw-shafts 72, provided with rightand left screw-threads, t'he brake-jaws i. mounted on said shafts, as described, and the means described for causing the jaws to clamp on the guide-rods when the weight of the car is taken off the springf, as set forth.

2. The combination, with a car, A, its hoisting-frame E, hoisting-rope C, and springs f, of the screw-shafts h, mounted in rotative bearings on the car and provided with right and left screws, the pinions fixed on said screwshafts, the racks on the hoisting-frame, and the brake jaws provided with female screws and mounted on thescrew-shafts, substantially as shown and described.

In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

DOMINIQUE ORESPIN DE LA J'EANNIERE.

Witnesses:

R0131. M. HOOPER, GEORGES OHAPUIs.

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