US138154A - Improvement in elevators - Google Patents

Description

A. c. Haenen.

\ Elevators. NOv. 138,154, Patented April 22, 1873.

AM, PHoro-L/THosRAPH/c ca M Mossen/v51; Preacfss) of arresting elevator-cars in case of breakage ABIEL C. HERRON, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO HIMSELF UNITED STATES PATENT rrron. A

AND DAVID WHITTEMORE, OF SAME PLACE.

IMPROVEMENT IN ELEVATORS.

Specification forming part of Letters Patent No. 138,154, dated April 22, 1873; application nled April 2,

To all whom it may concern:

Beit known that I, ABrnL C. HERRON, of Boston, in the county of Sui'olk and State of Massachusetts, have invented an Improvement in Elevator Mechanism; and I do hereby declare that the following, taken in connection with the drawing which accompanies and forms part of this specification, is a description of my invention sufficient to enable those skilled in the art to practice it.

The invention relates to an improved means of thehoisting-gear. a

In my invention I connect the hoisting chain or rope to the car by means of a link, formed as or with a wedge, the link having a bolt-pin extending through the cross-beam at the top ofthe car, and this bolt-pin having upon its bottom end a iiange or washer, between which and the beam is a spring, said spring being compressed by the iian ge or-washer under the Weight of the suspended car, butexpanding and drawing down the bolt when the weight ceases to act upon the bolt. Upon the top of the beam are levers, the inner ends of which extend to, or nearly to, the center of the beam, while their outer arms extend by the uprights of the car, and between the inner ends the wedge upon the connecting-links extends. The inner arms of the levers are held inward normally by the stress of slight springs, and upon their outer ends the levers have eccentrics, which, when the outer arms are pressed inward, are brought into contact with the uprights. Under the weight of the car the wedge is held above the levers or out of contact therewith, Ibut if the rope breaks, the spring, relieved from the stress of' the weight of the car, expands, and by expanding draws down the wedge, causing it to throw the inner arms of the levers outward, the outer arms moving inward and bringing the eccentrics into contact with the uprights. This contact and the weight of the car cause'the eccentrics to turn and bind against the uprights, thereby arresting the car, the eccentrics being preferably toothed, roughened, or serrated on their peripheral edges to cause them to bite or cramp against the upright surfaces.

My invention consists in such mechanism or combination of mechanism for arresting a falling elevator-car.

The drawing represents a mechanism embodying the invention.

Figure l shows a front and sectional elevation of ra construction embodying my invention. Fig. 2 is a plan of the same.. Fig. 3 shows the eccentric gripers in end elevation. Fig. 4 shows the connecting pin or link -in vertical cross-section.

a a denote the uprights, placed at opposite sides of the hoist-way in which the car moves. b' is the top beam that supports the guidesheaves c, 'over which the suspensory or rope d runs. c denotes the car f, the top beam thereof, to which the rope d is connected. Such connection is effected by means of a pin or link, g, upon which is formed a wedge, h,

the rope being fastened to the link above the v wedge. Passing through the beam j', thelink has at its lower end the nut c', which may have above it a Washer or head, 7c, said head having, between it and the beam, the spring l. The Weight of the car hangs upon the spring or presses the spring to the beam, and when released from said weight the spring throws down the nut and draws the wedge into the beam. Over the beam are the two pairs of levers m m n n, which levers are pivoted, as seen in Fig. 2, their inner arms extending to the center of the beam, and the inner arms of each pair being drawn inward against or toward the wedge by a spring, o. The outer end of each lever is formed to receive an eccentric, p, which is held by nuts q q, and turns freely on the lever. Normally these eccentrics are held just out of contact with the outer surfaces of the uprights, but if the inner arms of the levers are pressed outward by the Wedge the eccentrics will be thrown into contact with the uprights. lf the rope d breaks the springl will draw down the link g, and thereby cause the wedge to throw out the lever-arms and throw in the eccentrics, and by the downward movement of the eccentrics in contact with the uprights, they are turned on their pivots, bringing their enlarging peripheries so tightly in contact with the uprights as to eifectually and instantly arrest the car whenever in case of breakage, or yielding or slipping of the Q ramer.

rope, it stz'irts to fall. They levers turn on pins The combination of the wedge h, nut r,spring extending up from strap-pieces r Xed to the( l, levers m m n n, and eccentrics p, arranged nprights, and the eccentrics are held up to and operating substantially as shown and deshoulders formed on the levers, turning freely scribed.

however, between said shoulders and Washers Executed this 18th day of March, A. D. 1873.

held by the nuts. l A.-C. HERRON.

By use of this mechanism the necessity of employing gearracks running the whole length Witnesses:

of the uprights is obviztted. FRANCIS GOULD,

I claim- A M. W. FROTHINGHAM.

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