US252710A - Fbank t - Google Patents

Description

NrTED. STATES PATENT OFFICE.

FRANK T. WARE, on NEW YORK, N. Y.

SPECIFICATION forming part of Letters Patent No. 252,710, dated January 24, 1882.

Application filed November 23, 1881.

To all whom it may concern:

Be it known that I, FRANK T. WARD,0f the city, county, and State of New York, have invented a new and Improved Safety Attachment for Elevators, of which the following is a full, clear, and exact description.

The invention consists in the combination of devices, as hereinafter described and claimed.

. Reference is to be had'to the accompanying drawings, forming a part of this specification,

in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 represents a sectional elevation of an elevator of ordinary construction having my safety device attached, and showing the preferred arrangement of the springs. Fig.2 is a vertical section ot'the same, taken on the line a: m, Fig. l; and Fig. 3 is a cross-sectional elevation taken on the line 3 3 of Fig. 1.

A A represent the ways or side vertical bars of the frame of the elevator, which are formed with the gutters a a in their side edges, and are provided upon their inner faces with the racks d d; and B represents the upper crosshead of the car, which is provided with the guide-plates F F, which are provided with the headsfj', which run in the gutters a a of the ways A A, as shown clearly in Fig. 3.

Upon the under side of the cross-head B of the car are secured the bracketsD D,in which are pivoted the toothed cams E E. To the arms 6 c of these cams are attached the rods, arms,or springs gg, the adjacent ends of which lap upon each other in the center of the car, and are correspondingly slotted or forked for the passage through them of the lower end of the vertically-movable eyebolt G, to which the hoisting rope or chain is attached.

Between the rods, arms, or springs g g and the under side of the cross-head B are placed the curved or semi-elliptical springs H, through which the eyebolt also passes. This spring is of such strength that the weightof the car (No model.)

upon the eyebolt, when the car is suspended by the hoisting rope or chain attached thereto, will compress the spring so that the position of the eyebolt will be such as to hold the cams by means of the rods,arms,or springs g gnornially out of engagement with the racks d d, as shown in Fig. 1, but will instantly draw the eyebolt down through the cross-head,and permit or cause the engagement of the cams with the racks should the hoisting rope or'chain give way or break, and thus hold the car.

Instead of using the semi-elliptical springs H,a coiled spring or a ru bber spring or weights might be used and accomplish the same result; but the arrangement shown is preferred; and instead of using the racks and'making the cams with teeth, the cams might bcniade plain,

with a plain surface to bear against, which constrnction'would do for elevators intendt d for light work; but for heavy elevators the construction shown and described in the safest, and is therefore preferred.

The guide-plates F F, besides keeping, the car from lateral displacement, serve to lie the ways A A together near the cams and to support them against springing when the weight of the car is held by the cam Having thus desciibed my invention. I claim as new and desire to secure by LettersPatent- The combination, with the bars A, having gutters in their ide edges and I'dt'kS on their inner faces, of the cross-head B, having brackets D, and guide-plates with the headsf, the cams E, pivoted in said brackets and having arms 0, the springs g, attache l to said arms and overlapping each othe'r,the semi elliptical spring H, and the hoislingrope eyebolt Gr, passing through cross-head and springs, substantially as shown and described.

FRANK T. WARD. Witnesses:

H. A. WEST, U. Ssnowrorc.

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