US1163239A - Elevator safety-stop. - Google Patents

Description

J. W. IRON.

ELEVATOR SAFETY STOP.

APPLICATION men APR.26. 1915.

4 3 o \000 L9. O IO '3 1 a a 4 E=E""Z B 17 1 ll, 1% J 16 1 A WITN SSES: INVENTOR COLUMBIA PLANOGRAPH co., WASHINGTON; BTEI UMTEED 7STATE$ PATENT m n e JOHN WLADIMER moiv, or O K AN oanrronivia, assie'uon'or rorirrr ONE- HUNDREDTI-IS TO EUGENE GLATT, or OAKLAND, CALIFORNIA. 1

nLEvAron SAFETY-STOP.

To all whom it may concern:

Be it knownthat 1, JOHN @W. IRON, a subject, of theEmperor of Austria-Hun gal-y, residing at Oakland, in the county of Alameda and State of California, have invented new and useful Improvements Elevator safety stops, of which .the following is a specification.

.This invention relates safety stop. 1 1 I One of the objects of the present invention is to provide a simple, substantial, easily applied safety catch or grip forverticallymoving, suspended elevator cages or to an elevator the like which will automatically grip the guide rails in the shaft and stop the cage from descent if one or more of the-connected liftingorcounterbalancing cables part or give way, thus preventingloss of life and limb and unnecessary destruction of prop- Further objects will hereinafter'appear.

' The inventionconsists of the parts and the construction and combination of parts as" hereinafter more fully. described and claimed, having reference tokthe accompanying drawings, in which Figure 1 is aside elevation of an elevator, showing the application of I the .in-

vention. Fig. 2 is a plan view of thezlevers.

Fig. 3 is across section on line33,Fig. 1. Fig. 4

is a cross section on line H, Fig. 1.

Y I Fig. 5 is a section 011 line 55, Fig. 1. v

A indicates the guide rails in an elevator shaft and B the cage proper. P1votally mounted on top of the cage, as at 2, are

7 four levers, such as indicated at 3, there being one pair on each side. Straddling each pair of levers is a bracket 1, and extending through the top of the brackets are stop or set screws 5, one for each lever. These screws not only form stops which limit the upward movement of the levers, but they are also surrounded by coil springs, such as indicated at 6, the function of which will be hereinafter described.

Suitably secured to the inner end of each lever is a cable 7, and pivotally secured to the outer end of each lever is a rod 8. Suitably secured to the lower end ofeach rod is a wedge-shaped gripping member 9. The downwardly projecting rods 8 are parallelly disposed, one on each side of the guide rails,

and the wedge-shaped gripping members are similarly disposed. V

g Specification of Letters Patent. v Patented De 7 1915; Application filed April 26, 1915. serial No. 23,851.; i 7

"Suitably securednear. the lower endof 3 the cage are guide brackets10,lonefor each gripping member. These guide brackets are provided with a groove 11 on each side, and

member is preferably provided with sharp teeth, suchas indicated at 13, for the purpose of ;.forming an effective grip .when thrown into engagement with the rails; In

thisinstance four cables have been provided,

two of which may be provided for-counter balanclng purposes, and two for lifting or lowerln-g the cage." In operation, if one or moreofthe cables should part or. giveway force the lever in a downward direction against the top of the cage, thus pulling rod 8, w1th connected gripping member 9, in

it will immediately permit the spring Gto an upward direction. The inclinedface 11 1 I of the connected guide bracketlO will thus force the gripping member inwardly against the face of the guide rail, thus stopping the cage against further descent andavoidingQloss of life and limband unnecessary destruction to property; Ifonly one of the cables happens to part, it willbeseen that only one 1 grippingmember will be thrown into operative position. The scraping sound and the stopping of the cage will in this instance give suflicient warning to the operator that one of the cables has parted, thus permitting the neecssary repairs to be made 1 before any real damage has been done.

By referring to Fig. 1, it will be seen thatthe main side frame of the cage has been extended a little below the floor line of the cage, such as indicated at 15. Mounted on the lower end of the extended frame is a pair of guide brackets 16, and mounted a similar distance above the floor line and secured to the side frame of the cage is another pair of guide brackets 17. These brackets are more clearly shown in Fig. 3 and are providedfor the purpose of guiding or holding the cage against side thrust in the shaft when one or more of the gripping members are thrown into operative pos1- tion. While the gripping members, with

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