US805300A - Elevator safety device. - Google Patents

Description

110.805,30@ A 'PATBNTED NOV. 21, 1905.

M. A. KEELEY. ELEVATOR SAFETY'DEVIGE.

APPLIUATION IILEU KAEJI. 1905.

MICHAEL A. KEELEY, OF PITTSBUEG, PENNSYLVANIA.

ELEVATOR SAFETY DEVICE.

Specification of Letters Patent.

Patented Nov. 21, 1905.

Application filed March 21, 1905. Serial No. 251.204.

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vBe it known that I, MICHAEL A. KEELEY, a citizen of the United States of America, residing at Pittsburg, in the county of Allegheny and State oll Pennsylvania, have invented certain new and useful Improvements in Elevator Safety Devices, oi' which the -following is a specification, reference being had therein to the accompanying drawings.

This invention has relation to elevator safety devices; and it has for its object the provision of novel means whereby should the sustaining cable or chain ot the elevator become loosened or break the elevator-car will be stopped and held lirmly in the elevator-shaft and prevented from falling down the same.

In carrying my invention into elect I pro# vide an elevator-car with pairs of brake-shoes which are adapted to grasp the uprights at the sides of the car, these brake-shoes being carried on pivoted levers mounted on the car and the pivoted levers being operated by devices hereinafter described, whereby should the cable or rope break or become d isarranged, so that the car would be in danger ot' falling, the brake-shoes would be caused to grasp the guide-beams and hold the car in xed position. In addition to these brake-shoes and their operating means I provide catches which are thrown into contact with stops carried by the guide-bars when the cable or chain breaks or becomes unfastened or slackened from any cause, these catches constituting a means additional to the brake-shoes for stopping the car in case of accident and holding the same in fixed position in the elevator-shaft.

I have illustrated my improvement in the accompanying drawings, wherein* Figure 1 is a side elevation of an elevatorcar With my improvements applied thereto. Fig. 2 is a front elevation of one side of the car and a part of one of the vertical guide-beams of the elevator-shaft. Fig. 3 is a vertical section of a portion of the elevator-car and a portion of the .safety appliance, the view being taken on the line as a' of Fig. 4; and Fig. 4 is a detail sectional View of part of the elevatorcar on the line g/ y of Fig. 3.

In the several views ot' the drawings similar numerals ot' reference are employed to designate corresponding parts, and 1 designates the body of an elevator-car, which is of any desired size and which is mounted between vertical guide-beams, one of which (designated 2) is shown in the drawings and the other ot' which is of the same construction as that numbered 2 and is located on the opposite side of the car. The car 1 has at each side and constituting a portion of the frame of the car a vertically-disposed rectangular hollow beam 3, two of the sides 4 4 of this beam being composed ot' channel-bars and the other two sides 5 5 consisting of fiat plates, the flat plates lying on the outside ot' the angle edges of the sides 4 4. The angled sides 4 4 extend somewhat above the flat sides 5 5, and a cross-beam 6 projects between the projecting ends of the sides 5 5, (see Fig. 3.) the chain or other exible medium 7, by which the car is suspended, being attached to the crossbeam 6 in any desired manner.

Within the hollow beam 3 is arranged a rod 8, this rod projecting through the cross-beam 6 near its ends and being secured therein by means ot' a pin or bolt 9. The rod 8 extends downwardly to near the lower end of the beam 3 and is pivotally connected at 10 to a swinging rod 11, that is impelled toward the guidebeam 2 by a spring 12 and is formed with a head 13, that contacts with the angular side 14 of a catch 15, which is pivoted at 16 to the bottom 17 ofthe car. this catch 15 being adapted when swung toward the beam 2 to engage with one or the other of a number of stops 18, carried by the guide-beam 2, but being normally held in position where it will not contact with the stops by means ot' a spring 19, secured at 20 to the bottom 17 of the car. A cross-pin 21 extends through a nut 22, carried by the rod 8, and also extends through slots 23 in the sides 5 of the beaml3, and a second pin 21 extends through rod 8 and through slots 23 in the sides 4 4, and upon the projecting outer end of this pin are mounted links 24 24, that are pivotally connected at 25 25 to levers 26 26, which are pivotally mounted on the bottom of the frame, being pivotally secured by bolts 27 27, carried by blocks 28 28, which tit into holes in the bottom 17 and are locked therein by wedges 29 29.

Upon the lower ends or' the levers 26 26 are mounted brake-shoes 30` 30, being secured to the levers by pivots 31 31, and these brakeshoes being located close to but on opposite sides of the guide-beam 2. Vithin the hollow beam 3 is arranged a spiral spring 34, which at its upper end bears against a spider 35, iixed in the beam, and at its lower end bears against a plate 36, which is supported on the rod 8 by the cross-pin 21.

Fig. 2 of the drawings shows but one side of the elevator-car and but one of the vertical IOO IIO

guide-beams 2; but it is to be understood that all the parts above described are repeated upon the opposite side of the elevator-car.

The parts being constructed and arranged in the aboveclescribed manner operate as follows: The car being suspended from the chain or other flexible connection 7 is elevated and lowered in the ordinary manner. It' for any reason the chain or other flexible connection should break or become detached from the car or Jfrom the operating' mechanism of the elevator or `for any reason should become slack, so that the car would be in danger of falling, the brakes on the cross-beam being` released the spring 34 would torce the rods 8 downwardly, and the pin 21/, being impelled downwardly with the rods, spreads the upper ends of the levers 26 26 apart through the medium ot' the links 24 24, and this movement of the levers causes the brake-shoes 30 30 to be pressed against the sides of the guide-beam 2 and lirmly grasp the same. At the same moment the downward movement of the swinging rod 11 forces the catch 15 toward the guide-beam and into position to encounter one of the stops 18. While the brake-shoes 30 30 might entirely stop the downward movement of the car, it is possible that they would vpermit the car to descend slightly, as they have merely a Jfrictional engagement with the sides of the guide-beam; but the catch 15 will after a slight movement of the car encounter one of the stops 18, and the car is thereby brought to a full stop.

. VVhatI claim, and desire to secure by Letters Patent, is

1. In a device of the character described, a cage or car having a hollow vertical side beam, and a guide-beam provided on its inner face with a plurality o't' stops, combined with a rod arranged in said hollow beam, a cross-pin carried by said rod and extending through the beam, a spring arranged on said rod between the cross-pin and the upper end of the beam, a second pin extending transversely through said rod and hollow beam, links pivotally connected to the elevator-car, and to said second cross-pin, shoes carried on the lower ends of said links to engage the sides of the guidebeam, a catch pivotally supported from the elevator-car, and held normally out of position to engage with the said stops, and a rod pivotally connected to the first-mentioned rod and engaging said catch and adapted, when the first-mentioned rod is released, to force the catch out into position to engage with one of said stops, substantially as described.

2. 1n a device of the character described, an elevator-car having a hollow beam at the side thereof, a guide-beam, stops carried by said guide-beam, links pivotally attached to the car, brake-shoes pivotally attached to said links, a catch pivoted on the car a verticallymovable rod arranged in the hollow beam and held normally in vertical position above said catch and means connected to said rod and connected to said links and adapted when the rod is released to force the brake-shoes into engagement with the sides of the guide-beam, and move the catch into position to engage with one of said stops on the guide-beam, substantially as described.

3. 1n a device of the character described, an elevator-car, a guide-beam arranged adjacent the car, stops carried by said guide-beam, links carried by the car, brake-shoes pivotally attached to said links and adapted to embrace said beam, means carried by said car for causing the brake-shoes to clasp the beam when the suspending means of the car is relaxed, a catch carried by the car and adapted to be moved into position to engage said stops by the movement of the brake-shoe-actuating devices when the latter are operated to bring the brake-shoes into contact with the beam.

In testimony whereofI I aflx my signature in the presence of two witnesses.

MICHAEL A. KEELEY.` l/Vitnesses:

JOHN S. POWERS, ANDREW J. WALENHOK.

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