USRE10127E - James mccarroll - Google Patents

Description

Reissued May 30, 1882.

J. MOGARROLL.

SELF ACTING ELEVATOESAFETY APPARATUS.

UNITED STATESl PATENT Fries,

JAMES MCOARROLL,

OF NEW YORK, N. Y.

SPECIFICATION forming part of Reissued Letters Patent No. 10,127, dated May 30, 1882.

Original No. 255,646, dated March 2S, 1882.

To all whom it may concern:

Be it known that I, JAMES MCOARROLL, a citizen of the United States, residing in the city, county, and State ot'New York, have invented a new method, apparatus, or machine for preventing elevators from falling in ease of an accident to the rope, chain, or other contrivance by which the platform or carriage is suspended, of which the following is a specification, the means by which I attain this object being'illuslrated in the accompanying drawings. Y

Figure lis a vertical section ot the whole apparatus; Fig. 2, a detached view of the inevable pulley and spring actuating the safetycatches; and Fig. 3 represents a cani adapted to bear and secure a cord led through a hollow tube in the elevator; Fig. 4, an elevation showing the suspension-rope broken.

The cage or carriage of my improved elcvator is constructed of any approved pattern, and is adapted to be suspended by one or more hoisting ropes or chains passing over a pulley or series ot' pulleys supported upon suitable cross-beams overhead, and to be guided in its travel up and down between upright ways, all

as is found in the best form ot' elevators now in use.

My invention relates to devices for automatically arresting the fall of the elevator at any point in its descent in ease the hoisting rope or chain from which it is suspended shall give way or break, as is hereinafter fully described.

In the accompanying drawings, H H are upright posts or columns, between which the elevator J moves, and M the cross-beam,from which the elevator is suspended by means of one or more wire ropes, d d. The main suspension-rope d is led over suitable pulleys to a winding-drum operated by a steam-engine or other suitable motor. In its course to this drum itis carried over the top of a frictionpulley, c, revolving in a box which has free play vertically in the pedestal or hangers P, by which it is supported. The box carrying the pulley e is supported by a spring, n, of any approved pattern, and the suspension-rope d is so brought to bear upon the pulley as that the tension thereon, when carrying the weight of the elevator, will operate to bear upon the spring and extend it into position to contract Application for reissue filed April 29, 1882.

powerfully the instant the tension ofthe rope tl is slackened or removed by a severance thereof or other cause. Upon the sides of the elevator J are firmly secured a series ot' projecting lugs or pins, O O, either singly or upon a connectiugplate in the forni of a rack. Opposite to these lugs O O a series ot' latches, r/ g, are centrally pivoted upon the uprights H, between which the elevator moves, so as that the outer arms of the latches are brought to bear against stops upon the sides ot' the uprights H, which arrest their further movement and att'oi'd them very firm support. The inner arm ofeach latch is somewhat heavier than its outer arm, so that the latch will turn automatically upon its pivot, carrying its outer arln inward clear of the rack or lugs O O upon the elevator. The innerarms,

of all the latches are connected by a chain or cord, b, with the lower end of the sliding box carrying tho friction-pulley e, this chain or cord being so adjusted as that when the box and pulley are forced down by the tension of the suspension-rope d thereon the inner arms of the latches will be drawn down thereby, so as to disengage and clear their outer arms from the lugs or rack O O on the elevator. Auxiliary cords or chains r r, connected with the cord b, and by means thereof with all the latches g g, or otherwise connected directly with the inner arms of said latches, are led to a wire cord which passes down through a vertical tube or hollow post, K,in the elevator. A cam, l., hinged in a slot in the side of the tube or post K, and having an arm projecting outward therefrom, is by n downward movement of said arm broughtto bear upon the wire cord so as to clamp it. Hence when the elevator is falling a slight pressure upon the arm of the cam l will cause it to catch and hold therope, and thereby exert a tension upon the latches g g to bring them into play to en gage and arrest the elevator and prevent its fall, as above described.

Q i Springs G O may be interposed in the cords r r to prevent an undue strain upon and consequent snapping ofsaid cords should the latchves g g, when called upon to act, drop directly against the lugs O O instead of between them.

In the operation ofthe elevator the latches gg are maintained in their inoperative position by the weight ot' their inner arms, the cords b IOO b being kept slack and the spring n extended by the constantvpressnre of the elevator-rope d upon the friction-pulley e, due to the tension of the rope by reason of the weight of the elevator thereon. In case, however, of a sudden breakage of the rope el, the spring n, relieved from tension, will ily np, carrying with it the cords bb, and thereby exert such strain thereon as shall canse them to instantly throw out the latches, so that they shall engage the lugs O 0, (see l'ig. 4,) and thereby arrest and uphold the elevator and preventits fall. The same eiect mayV be produced instantly' by a pull upon the arni of the cam-lever l within the elevator should it he falling, for the weight of the cage in descending will,by the engagement of the cuni with the cord t', (see Fig. 4,) instantly operate upon the latches to bring them into play, as above described. Thus I have in this apparatus two sure and certain modes presented for preventing a calamity in the eventofan accidentto the sustaining-ropethe one self-acting through the instant operation of a spring, n, the other at the disposal of any one who, being in the elevator, may give a pull upon the cam-lever l.

It is evident that the character and position of the satetyspring u, actuating the latchcords b b, and of the'method of bringing the tension ofthe main rope d to bear thereon, may be greatly varied without departing from my invention, and that many equivalent devices may besubstituted for the cam l to obtain a grip ofthe safety-cord t' within the elevator.

that I claim as new, and desire to secure by Letters Patent, is-

'1. The combination oflatches pivoted upon the sides of an elevator shat't or frame, and adapted to engage projections or recesses in the elevator, with aspring brought into play by the tension thereon of the main rope, nnder the weight of the elevator suspended therefrom, and with intermediate cords, by which the spring, when relieved from tension, will be made to act upon the latches and throw them into eifective engagement with the elevator to arrest and supportit, substantially in the manner and for the purpose herein set forth.

2. Thecani,hollow tube, andauxiliarychains in their connection with the latches, substantially in the manner and for the purpose here in set forth.

JAMES MeoARnoLL.

Witnesses: s

FULLER WALKER, W. H. SHUEY.

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