US125256A - Improvement in stop-motions for elevators - Google Patents

Description

HENRY E. BATHRICK.

Improvement in Stop Motion for Elevators. No. 125,256, PatentedAp ril2,1872.

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" %WMW w W TATES HENRY E. BATHRICK, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN STOP-MOTIONS FOR ELEVATORS.

Specification forming part of Letters Patent No. 125,2 56, dated April 2, 1872.

To all persons to whom these presents shall come:

Be it known that I, HENRY E. BATHRIGK, of Boston, in the county of Suffolk and State of Massachusetts, have invented a new and useful Improvement in Elevators, and that the followingdescription, taken in connection with the accompanying plate of drawing, is a full and complete specification of the same.

This invention relates to elevators or hoist ing apparatus for raising and lowering merchandise, &c., and more particularly to that class of such elevators as raise and lower the platform by the winding and unwinding of a rope to which the platform is suspended, the platform being guided by fixed vertical guiderails. The object of the invention is to provide means that will be automatic in operation,to arrest and hold the platform from falling in case the hoisting-rope should break, or other cause. Under this invention jaws for gripin g the guide-rails of the elevator-platform are depended upon, in cases of accident, to hold the platform from falling; and the invention consists of griping-jaws that are extended through vertical tapering openings (the smaller ends being uppermost) of the carriage, and are so arranged at their inner ends as to be free to play both in avertical and a horizontal plane, in combination with the hoisting-rope, so connected to the carriage and with reference to the inner ends of said jaws that from a breakage of the hoisting-rope, or a giving way of the tension thereon from any other cause, the part or parts forming the connection between the hoisting-rope and carriage will then be so actuated as, with a wedge-shaped construction thereof, to properly move the inner ends of the jaws to bring their griping-ends to bear on the guide-rails with a friction sufficient to hold such griping-ends back from the fall of the carriage, causing them, as is obvions from the faster descent of the carriage by the tapered openings aforesaid, through which the jaws are extended, their firm set against and gripe of the guide-rails; this set ting of the jaws finally arresting the fall of the carriage.

In the accompanying plate of drawing my improvement in elevators is illustrated- Figure 1 being a view, mostly in elevation, but partially in vertical section, of an arrangement of parts according thereto 5 Fig.2, a horizontal section in plane of line w w, Fig.1; Figs. 3 and 4, views in detail.

A in the drawing represents the carriage of an elevator, constructed in the present instance of a platform, B, with upright posts 0, joined at their upper ends by a cross-beam, D. E, guides fixed to carriage A by bolt-rods a and screw-nuts 1).. These guides E embrace fixed vertical guide-rails F, secured to the frame-work H, through which the carriage is shown as arranged to move. I, the jaws for gri pin g guide-rails F. Thesejaws, in the present instance, are four in number, and are in pairs over the top of the cross-beam D to carriage-a pair for each guiderail F. d, the griping-end of the jaws I, made with steel faceblocks, in position to form the bearing of the jaws upon the guide-rails F, one on each face, f, thereof. From the guide-rails F the jaws I extend toward the vertical centerline of the elevator", passing through tapering vertical openings K, one for each pair of straps, L, fixed to the carriage A. The jaws I, at their inner ends g, are hung, the two of each pair, upon fixed horizontal pivots h of posts 'i, not only to be free to turn, but to move away from or toward each other. The tapered openings K have their smaller end uppermost, and again st their vertical tapering faces I the jaws I bear, said faces Z'being knife-edged to reduce friction between them and the jaws. M, the hoisting-rope of the elevator, secured to the eye 0 of a bolt or rod, P, arranged to play vertically through the central axis of cross-beam D to carriage. The rod 1? is secure from escape by a nut, m, at its lower end, which nut also fastens a bent spring, R, hearing by its free ends on the lower side of cross-beam D. The roperod 1?, above the cross-beam D, is provided'with vertical wedge-shaped blocks a, in position to pass in between the inner ends of each pair of jaws, I. The larger end of the wedges a is uppermost, and the wedges n are fixed upon the rope-rod with reference to its length, to be within the inner ends of the jaws I when the rod is at its lowest position, from the action of the bent spring It thereon, and to be out of the jaws when, by tension on the hoisting-rope, the action of spring R is overcome.

In the ordinary running of the elevatorthere is no action or effect from the jaws I and other parts above-described, the jaws I being free and loose from the guide-rails F, as, at such time, they are at the lower portion. of the openings K, which is sufficiently large to prevent any bind on the jaws, and the wedges n of the rope-rod P are above them. Suppose, however, the hoisting-rope to break, or any other accident to occur which would take off the tension on the hoisting-rope, then an operation of the jaws F and other parts described above will occur as follows: The spring R of roperod P will then instantly pull down the rod P, forcing its wedges a into and between the inner ends g ofjaws I, opening them at such ends from each other, which closes them, at

their steel-faced gri pin g-ends cl, upon the guiderails F with sufficient friction thereon to hold said griping-ends back from the fall of the earriage, which, consequently, then falling the faster, acts through the wedge-shaped or tapered openings K to firmly bind and set thejaws against the guide-rails F, producing finally, as is obvious, a complete stop or arrest of thefall of the carriage. Reunite the broken rope or repair whatever other cause may have operated to allow the elevator-carriage to fall,

and the gripe ot' jaws I on guide-rails F can be released without trouble or difliculty by simply getting tension on the hoisting-rope sufficient to overcome the spring R, and thus pulling up the-rod P. It passes, by its wedges u, out of the inner ends of-jaws, and sets them free.

In lieu of four gripe-jaws only one may be used; but i'ourtwo for each guide-rail-insures a perfect suspension of the carriage.

In lieu of one opening, K, for each pair of jaws, I, there may be one for each jaw; the knife-edge bearing on the jaws by the openings K may be dispensed with, but it is best to employ it, for the more the friction between jaws and openings Kis reduced the less the friction of the jaws on guide-rails is offset, and, consequently,the more certain and quickly do they seize and bind the rails as desired. In lieu of placing the wedges n on rope-rod, they may be on the inside faces to jaws, at their inner ends. Also, other forms of springs may be used in place of the bent spring It.

Having thus described my improvement in elevators, I shall state my claim,'as follows:

WVhat 1 claim as my invention, and desire to secure by Letters Patent, is

1. The combination of the gripingjaw I, an opening, K, and the hoisting-rope of an elevator-carriage, constructed and arranged for operating together, substantially as described, for the purpose specified.

2. I also claim the knife-edge bearing between a jaw, I, and opening K, substantially as and for the purpose described.

The above specification of myimproved stopmotion for elevators signed by me this 17th day of January, 1872.

HENRY E. BATHRIGK.

Witnesses:

ALBERT W. BROWN, EDWIN W. BROWN.

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