US109169A - Improvement in elevators - Google Patents

Description

2 Sheets-Sheet, 1

G. W. BALDWIN. ELEVATOR.

Patented Nov. 15, 1870. v

THE NORRIS PETERS ca. Puamumoywunmomu, o. c.

2 Sheets-Sheet 2.

G W. BALDWIN. ELEVATOR.

No.-10'9,169 Patented Nov. .15, 1870.

CYRUS W. BALDWIN, OF BOSTON, MASSACHUSETTS.

Letters Patent No. 109,169, dated November 15. 1870.

. IMPROVEMENT IN ELEVATORS.

The Schedule referred to in these Letters Patent and making par: of the same To all to whom-these presents shall come:

Be it known that I, OYnUs'W. BALDWIN, 'of Boston, in the county of Suffolk and State of Massachusetts, have made an invention of certain new and useful Improvements in Elevators for Buildings, &o.; and do hereby declare the following to be a full, clear, and exact description thereof, duc reference being had to the accompanying drawing making part of this specification, and in which- Figure 1 is a perspective view of my invention;

Figure 2 is an under-side view of the platform of the device and simplifying its construction, but to vastly simplify its operation, or the number of movements before necessary to release the locking orsafety device.

'The construct-ion and arrangement of parts which secure the above results also serve to cause the looking device to set itself automatically upon ascent of the elorator-carriage, being, in this respect, a great improvement upon the construction shown in Letters Patent before mentioned.

The invention or improvement also relates to means for providing against accidental fall of the platform of the carriage, should the cross-head or other portion of such carriage to which is usually applied the safety device or stop.

As heretofore constructed the safety device or stop of elevator-carriages has been applied to the crosshead, or other portion of the carriage diposed above its platibrm. Uonscquently, upon breaking of any portion of the carriage above its platform, the safety device becomes useless, and the platform is allowed to descend unchecked to the floor, with the usual fatal results to life and property.

To provide a means of remedying this latter objec tion, my invention consists in applying the safety device hereafterexplained to the under side of the platform; consequently the fracture or failure of any portion of the carriage cannot destroy the action of such device.

My present invention further consists in disposing loosely, within certain clas'ps or recessed brackets atfixed to the lower surface of the platform of the clevator-carriage, and embracing opposite sides of its supporting-slides or guides, two fluted or roughened rollers or circular disks, these rollers resting upon and being retained in place within the bracket and upon one side of the slide by means of two tripping levers secured to a horizontal shaft extending transversely across the under side of the platform, the shaft being in turn cont-rolled and actuated by a spring and by a pallet'and lever, as hereinafter explained, and the whole being so arranged and operating that, upon fracture of the supporting-rope or chain of the carriage, the free ends of the tripping-levers before mentioned shall rise with a sudden snap, and throw the rollers upward and between the clasp and supportingslides, between which they become tightly wedged,

and so as to lock the carriage or its platform tightly to such slides.

In the drawing before alluded to as accompanying this specification-- AA denote two upright beams or posts for supporting the elevating-carriage, the slides or ways for guiding the vertical movements of such carriage being shown at b I), as applied to opposite inner faces of the posts in the usual manner.

The cross-head of the elevator-carriage is shown at c and its platform at d, the posts or rods connecting the two being shown at e o.

The extremities of the cross-head straddle the slides b I), while the lower surface of the opposite sides of the platform (Z is provided with twin-shaped strong recessed brackets or clasps, ff, a portion, g, of the recessions of such brackets serving to embrace the slides, while the lower and larger port-ion h of such depression or groove serves to receive a fluted roller, i or i, which is disposed loosely within it, the said portion It being open at bottom, as represented in Figure 5 of the accompanying drawing.

By referrring to such figure the reader will see that the portion it of the recess of the brackets is angular, or slightly converging at its upper part, and of such size that this upper part,'with the slide 1) iuclosed, shall be of somewhat less diameter than that of the fluted rollcr;'hence, it will be obvious that, as this roller is suddenly forced upward and caught between the boundary of the opening 71 and the slide b, the descent of the platform serves to wedge or force the roller tightly between such parts, and clamp the brackets, and consequently the platform, securely to the slides, and instantly arrest any further descent of said platform.

The rollers t or i rest upon the free ends j of two tripping-levers, 7t 7a, which are fixed to opposite ends of a horizontal rocker-shaft or rod, 1, extending trans vcrsely of the under side of the platform at, and supported in suitable boxes, an an, applied thereto, aeoiled or other spring, a, being suitably applied to the shaft, in such manner as to maintain the free ends of the levers 7t it in contact with the lower surface of the brackctsff, and so as to cover the lower opening of the recess h and prevent escape of the rollers therefrom.

One of the levers or trippers, h, is provided with a small notched projection, 0, this notch being for reception of the free endp of a right-angular bent pawl or trigger, q, fulcrumc'd to the outer face of one of the brackets, f, and immediately in rear of its roller rccess, the upper arm 0' of such pawl being pivoted to the lower end of a connecting-rod, s, which extends up alo ngside of one of the posts 0 of the elevator-carriage, the opposite end of such rod in turn being pivoted to the outer extremity of the longer arm 1? of a lever, '11, which is fulerumcd to the fronttace ot' the cross-head c of the carriage, as represented.

The extremity of the shorter arm of the lever 11 is extended to the center of the cross-head c, where it supports upon its upper surface a bracket or bent support, 1r, such bracket being depressed by a coiled or other spring, :c, disposed within or upon the upper part of the cross-head, a bolt, y, having upon its upper extremity an eye, being extended through the cross-head and screwing into the lower partof the bracket 11', as shown in tig. 4 of the drawing.

A rope or chain, c, is to be secured to the eye of the bolt 3 and thence carried to the hoisting mechanism in the usual manner;

The above constitutes the mechanical construction of my invention, the operation of which may be thus :xplained:

The weightof the elcva'.or-carriage, with or without the load, forces upward the bracket 10, and away from contact with the lever u, and thus remains during the ordinary working of the elevator-carriage.

To adjust the safety device covered by my invention so as to prepare for accidents, the tripping-levers are to be depressed sutlicicntly far to allow the lower and free end of the trigger to be inserted within the notch before alluded to as formed in one of them.

The spring of the shalt 1 serves to retain the trigger in contact with the notch at all times during the rise and descent of the carriage, until accidental t'racturc or slacking of the rope from any cause ensues.

The slacking of the rope has the cfiect of instantly allowing the bracket 11-, by means of its spring, to be depressed, this lowering of the bracket having the ctfect of raising the outer arm of the lever 14, and, by means of the rod 8, release the trigger from contact with the notch ot' the tripping-lever, and permit the spring of the rocker-shaft to elevate the levers with a sudden snap, and throw the rollers upward between their respective brackets and the slides I) I), in inaliner and with results before explained.

The above description of the nature and operation of my invention will enable mechanics to construct and explain it, it being remarked that, to adjust the safety device for use, the tripping-levers are to be depressed by hand, and the trigger q inserted within the notch of one of them. On releasing the hold of the lever the springof the shaft 1 serves to maintain the contact of the trigger and lever until fracture of the sumaorting-ropc or chain.

In order to dispense with the necessity of thus setting the safety device, and enable such setting to be I pivot the lower ends of the rods 8 directly to one of the trippinglevers k, as shown in fig. 5 of the accompanying drawing, which is a side elevation of one of such levers and the parts immediately contiguous thereto, it being understood that the spring a of the shalt I is dispensed with in this instance.

liy thus pivoting the rods to the lever it will be obvious that, as the bracket is drawn up ard, wit-h respect to the cross-head, by the weight ot'thc carriage, as the rope is drawn tautthe lovers k 71; drop by their own gravity and that of the rod 8, thus allowing the rollers it in like manner to fall with them, and rc lease the grip of the carriage upon its supporting ways. 7 W

l have contemplated the application of the principle ot'l my present invention to elevators formerly constructed, in which toothed racks and two bent levers, opera-t ed by a send-elliptic spring, and provided with lateral bolts for taking into the teeth before mentioned upon breakage of the rope, were the means employed for arresting the accidental descent of the carriage.

As so constructed, the supporting-rope is at all times connected to the eye-bolt, and, consequently, to the safety device, and thus is liable, by being caught and drawn taut accidentally at any time after the breakage or release thereof, to releascthe hold of the bolts upon the racks, and start the carriage again upon its illegitimate descent.

.By means of my present invention, applied to such old construction of parts, the hold of the rope is at once entirely released from connection with the safety locking device upon breakage or slackening of such rope, and, consequently, such device retains an undisturbed hold of the supporting-slides ot' the carriage.

Claims.

I claim as my invention and desire to secure by Letters Patentot the United Statesl. The safety-catch or locking device, applied to the lower part of the carriage-platform of the elevator, substantially in the manner and for the purposes shown and set forth.

2. As a safety device, for arresting .the accidental fall of an elevator-carriage, the employment of the fluted rollers t '1', operating, in connection with the recessed brackets'fj" or their equivalents, to embrace opposite sides of, and clasp or clamp the supportingslides or guides of such carriage, in manner and operating substantially as before explained.

3. As a means of actuating or raising the rollers it, as well as forming a support to the same, the employment of the tripping-levers 7a k, supported by shaft], and operated by the bracket w or its eqnivaalent, essentially in manner as herein shown and explained.

t Thc combination and arrangement of the rollers it, levers It 7:, (supported by the shaft 1, provided withthc spring 11,) trigger q, lever a, and bracket '10, the trigger q being connected with the lever u by the rod 8, and the bracket 20 provided with the spring x, and the whole operating, in connection with the recessed brackets f f and the slides b, in manner and for the purpose as before explained.

CYRUS W. BALDWIN.

Witnesses:

FRED. CURTIS, EDWARD GRIFFITH.

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