US855646A - Safety device for elevators. - Google Patents

Description

No. 855.646. PATENTBD JUNE 4, 1907.

. B.LBHN.

SAFETY DEVICE FOR ELEVATORS. APPLIOATION.IILED r33. 13, 1907.

I, la /7 0 WV? f Wihmooeo rice BERNARD LEHN, OF ESCANABA, MICHIGAN.

SAFETY DEVICE Foe ELEVATORS.

Specification of Letters Patent.

Patented June 4;, 1907.

Application filed February 13 1907f Serial No. 357,197-

To alt w/tom it may concern.-

Be it known that I, BERNARD LEHN, a citizen of the United States, residing at Escanaba, in the county of Delta and State of Michigan, have invented certain new and useful improvements in Safety Devices for Elevators; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention-relates to safety devices for elevators and my object is to provide means upon the elevator frame to engage the guides when thesupporting. cable for the elevator becomes broken and thereby stop the descent of the elevator. v I

A further object is to provide means for holding the locking device out of engagement with the guides and a still further ob ject is to provide means for automatically directing said device into engagement with the guides when the supporting cable becomes broken.

Other objects and advantages willbe hereployed in securing the auxiliary cables to the,

main cable.

Referring to the drawing in which similar reference numerals designate corresponding parts throughout the several views, 1 indicates a supporting beam for an elevator which may be of the usualor any preferred: form and is provided at each end with a chan- 1101 2 which channels are adapted to receive the usual form of elevator guides 3.

Extending vertically through the central portion of the beam 1 is a bolt 4 to the upper end of which is secured the usual form of supporting cable 5 and by which means the elevator is raised and lowered and in this connection I provide an opening 6 in the beam 1 cf greater diameter than the diameter of the bolt 4 so that should the cable 5 become move longitudinally through t Opening I the beam.

In order to suspend the elevator and pre vent the same from descending should the supporting cable bec'ome'broken I have provided my improved safety device which consists of levers 7, one for each end of the supportingbeam 1 and which are pivotally secured in slots 8 extending vertically through the beam 1 said levers being provided at their lower ends with heads 9 which'are so arranged that when the levers are swung in one direction upon theirpivot points the heads will engage notches 10 disposed at intervals in the faces of the guides 3.

The 'slots 8 are so constructed that the levers 7 may be swung a predetermined distance in either direction so that when the elevator is in use the levers may be swung a of a clamp 12 and as long as the su porting cable 5 is suspending the elevator t e au'xilj iary cables 11 will be held taut and the levers removed from engagement with the support ing guides.

The auxiliary cables in theirjpassage from the levers 7 to the supporting cable 5 are directed around sheaves 13 which are rotatably mounted in the lower face of the beam 1 and through bores 14 so that should the supporting cable 5 become broken and the bolt 4 movedlongitudinally through the opening 6 the auxiliary cables 11 will likewise yield and allow the levers 7 to move into engagement with the notches 10.

At the lower ends of the slots 8 have provided depending shoulders 15 which are designed to be engaged by and limit the inward movement of the lower ends of the levers 7 thereby preventing the auxiliary cables 11 from moving the upper ends of the levers into engagement with the face of the guides 3.

In. order to immediately rotate the levers 7 upon their pivot points and direct the heads 9 into engagement with the notches 10 when the-supporting cable'5 becomes broken, I se- 5 5 broken, the bolt 4 will be left free to readily l cure to the upper ends of the levers 7 one end :very pheap durable and efiicient safetyapof tension springs. 16,;the oppositeends of which are secured to ears 17 carried by the upper surface of the supporting beaml-so that as soon as the'cable 5 becomes broken the springs 16 will immediatelyoperatethe clamp 12 it will be seen that said clamp may be adjusted at intervals uponthe cable to compensate for any contraction or expansion of the supporting cable or auxiliary cables; thus holding the levers out of engagement with'the guides.

It will now be seen that have provided aplian ce for 'elevators, and one that will POSLitiYQ'ill its operation and it will further .be seenithat said appiliance may be attached .to any form of elevator employing a cable-for. operating the same. r 3

What i claim is 1. In a device'of the "elass described the combination with a supporting beam and" d es therefor; of a supporting cable forsaid b e din levers extending vertically through p slots-adjacent the ends of saidbeamand piv-' otaliy mounted therein, here being shoulders on the lower faceof said supporting beanr andat one edge of said slots adapted to limit the-inward ,movement of the lower ends iof said levers, said-levers having heads on the name to this specification in thepresence of two subscribing witnesses.

lower ,ends t hereof adapted to engage notches. in the guides auxiliary cables secured at one end to the lower ends of saiddevers and at their oppos t e d to the uppor ng a e, means to adjustably secure the auxiliary ca-t bles tojthesupporting' cable; there being ears seaeee beam and tension-springs disposed between said earsand the upper ends of said levers adapted to swing the levers and direct the heads, into engagement with said notches levers 7 and stop the descent of the elevator.-

Bysecuring theauxiliary cables 11 to the supporting cablev5 through the medium of a when the supporting cable becomes broken.

2. In ,a device of the class described the combination with a supporting beam and guides therefor; of a supporting cable, a bolt extending loosely through an opening in the dextendinglnpwardly from said supporting oenter'of saidisupporting beam adapted to receive the supporting cable, levers pivotally mountedin slotsin said beam, provided with headset the lower ends thereof adapted to entern otches in the guides, there being depending shoulders on the "beam adjacent one edge'of the slots adapted to limit the inward movement-of the levers, auxiliary cables secured at one end to theilower ends of. said le- ,v ers and at their opposite ends to the supportingcable, a clamp for 'said auxiliary cales whereby the same may be adjustably seprimed ,to the supporting. cable; sheaves .on

tending ears on said an portingvbeam and tension spripgfi dispose between said ears :andthe upper ends of the levers whereby when the 'supportingcable becomes broken ;the springs will direct the-heads into engagementwith'the' notches.

ilnqtestimonyiwhereof I have signed my BERNARD'LEHN. YVitnesscs:

O. V. LINDEN, Auous'r BENSON.

saidsupporting beam' around which said auX- iliary cablestake, there 'being' upwardly ex-.

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