US890797A - Elevator safety device. - Google Patents

Description

No. 890,797. PATENTBD JUNE 16, 1908.

G. B. RICE.

ELEVATOR SAFETY DEVICE.

APPLICATION FILED JUNE 4. 1906. 3 B s sH 1- Zizvenfor, George 25. Race 1/ lnessss:

m: NORRIS PETERS :o., wAsl-lmcrun. v. c.

No. 890,797. PATENTED JUNE 16, 1908. G. B. RICE. ELEVATOR SAFETY EEvmE.

APPLICATION TILED JUNE 4, 1906 3 SHEETS-SHEET 2.

-m: vawms P: YER: ca..' wuumarou. o. c.

PATENTED JUNE 16, 1908. G. B. RIGB.

ELEVATOR SAFETY DEVICE. APPLIOA'TION FILED JUNE 4, 1900.

3 SHEETS-SHEET 3.

28 M2 1 kg-4. J9 '0 Gearye B. Rice 4E NORRI$ PE'nIns cm. WASNINEYON. D- c.

25 line 111 of Fig. 2.

GEORGE B. RICE, OF SEWIGKLEY, PENNSYLVANIA.

EIFEVA'ITOB. SAFETY DEVICE.

Specification of Letters Patent.

Patented June 16, 1908.

Application filed June 4, 1906. Serial No. 319,982.

To all whomit may concern:

Be it known that I, GEORGE B. RICE, a citizen of the United States, residing at Sewickley, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Elevator Safety Devices, of which the following is a specification.

My invention relates to improvements in safety devices for elevator cars, and embodofparts hereinafter described, pointed out in the claims, and illustrated in the accompanying drawings, in which Figure 1 represents a broken front elevation of an elevator-shaft with a car arranged to travel therein in the customary manner. Fig. 2 is a sectional plan view on line 11 of Fig. 3, showing an electro-mechanical appliance forming part of the invention. Fig. 3 is a side elevation of same partlyinsection on Fig. 4 is a transverse section on line IV-IV of Fig. 2. Fig. 5 is a sectional plan view of a circuit-breaker and means for actuating the same. Fig. *6 is a cross-section of the same on line VI-VI of Fig. 5. Fig. 7 is a broken side elevation of a speed-governor forming part of the inven tion. Fig. 8 is a central section of the same ,on line VlIlVllI of Fig. 7. Fig. 9 is a diagram of an electric circuit employed in carrying out the invention.

1 designates the elevator shaft provided at its sides with the customary guide-strips 2. 3 designates the cararranged to traverse the shaft, which latter is closed at each landing by the customary grille 4 and slidingdoor 5.

6 designates a bracket fixed to the inner side of the door in the shaft and provided with a beveled end 7 adapted to actuate a circuit-breaker fixed to the front wall of the car. Said circuit-breaker consists of a lever 8 fulcrumed upon a pin 9 and having one end normally held in engagement with a contact point 10 by its opposite resilient end 11.

Contact point 10 and the resilient end 11 are I fixed to non-conducting material 12 secured to the front wall of the car. Lever 8 is provided with a knob of nonconducting material 13 which is engaged by bracket 6 when the door in the shaft is opened, and forced towards the wall of the car until the end of lever 8' is disengaged from the contact point 10. When the circuit-breaker is thus opened an electrical current passing therethrough is interrupted and permits two sets of jaws, hereinafter described, to engage the guidestrips 2 with sufiicient force to lock the car at the landing until the door is closed.- When the latter operation takes place bracket 6 is drawn out of engagement with knob 13 and permits resilient end 11 to force the opposite end of the lever into engagement with contact point 10. This arrangement obviates accidents due to assengers leaving or entering the car at landings while the car is in motion.

14 designates a pair of beams fixed to the top of the car, said beams being, preferably, those to which the hoisting cables 15 are attached, but, if desired, special beams can be employed and fixed either to the top or bottom of the car as convenience may dictate.

16 designates two sets of jaws arranged in pairs at the ends of the beams, the jaws of each pair being located at the opposite sides of a guide-strip so that they may grip the latter at the proper time and lock the car from upward or downward movement. Said jaws are fulcrumed upon pins 17 extending through brackets 18 secured to the adjacent sides of beams 14, and are actuated through the instrumentality of links 19 pivoted at their ends to the rear terminals of the jaws and to the terminals of a pair of oppositelyextending connecting-rods 20, forming toggles whereby the jaws are simultaneously actuated.

The inner ends 20 of connecting-rods 20 are bifurcated to straddle a transmitting lever 21 to which they are pivotally secured at opposite sides of its fulcrum 22 mounted in a pair of brackets 23 secured to the inner side of one of beams 14. Lever 21 extends through a slot 24 in the opposite beam and is pivotally secured at its outer end to a stem 25 integral with the plunger 26 of a solenoid consisting of said plunger and a magnet 27. The magnet of the solenoid is fixed to the adjacent beam 14 by a pair of collars 28, one of which has a small central opening 29 in which a guide-pin 30, extending from the adjacent terminal of the plunger, operates. Said guide-pin consists of brass or other nonmagnetic metal to prevent the collar from becoming magnetized by the current passing through thesolenoid. Stem 25 also consists of brass and at the other side of lever 21 it.

- abutment 31 and a washer 34 which latter is :respectively. Rods 52 53 extend through guides 54 55- secured tothe adjacent sides of held in enga ement with the spring by a nut 35 adjustab ly engaging the threaded ter-" I i lars 56 57 are preferably adjustable so that the 'In practice the solenoid is normally magsnetized to hold the parts in the position shown'in Fi 33, but should the-current be interrupted .the spring will immediately expand and, through the instrumentality of theintervening mechanism, close the jaws upon the guide-strips minal of the stem.

2 against Y the action of spring withsuflicient power 'to lock the car from further movement. spring 33 ismade light 320 T to the solenoid, but its power is compounded "sufiiciently to hold the car, by lever 21, links -19,:"and jaws 16.

36 designates a grooved governor-wheel :mounted upon a shaft 37 ,acarried at the-upas possible to ofi'er but minimum resistance per ends of a pair of arms 38, pivoted at their ower terminals upon a shaft 39, mounted in *a bracket '40, 'ona transverse plate 41'-se cured to the'tops of beams 14. Wheel-36is 30 "channel-bars 43 by a retract1 tached 'atitsfends to cross-rods .45 46 secured' to arms38 and beams 14, respectively.

helddnengagement withuedge 42 of one of e spring 44 at- 47 designates a plurality of bolts extendingtransversely through the. governor-wheel and provided at their ends with oppositelydisposed. ivotally-mounted weights '48 49,

. normally eld in the positions shown in'Fig. =7: by expansion-springs 50 51 embracing'ro s 5253 loosely connected to weights 48 49,

' the governor-wheel and are embraced by fixed collars 56 57 against which thesprin s '50- 51, respectively, abut, and normally hold them against the adjacent guides.

58 designates a bolt extending through a arms; 38 a short: distance beneath the governor-wheel and providedwith another circ11it-breaker-consisting of apair of pivotally rnounted switch-blades 59 60,- normally held in engagement with sockets 61 ,secured to arms 38 and=insulatedtherefrom by nonconducting material 62 the upper ends of which i =s 'acing-sleeve 63, hold the blades in vertical embrace bolt 58 and,.'in conjunction with a a ement with weights :48 49.

Should the car descend with abnormal speed weights48 will'bethrown outwardly by-centrifugal force against the action of springs 50, so that one of: them will strike the upper terminal 59 of blade 59 and-disconnectthelatter from its socket. Should the ear ascend at abnormal speed weights 49 Ewill be thrown outwardly so. that one of them radius t .by eitherof the switches being disconnected from its socket will demagnetize the solenoid andpermit spring 33 to set the jaws. Coltension of springs 5051 maybe regulated as desired.

As shown in the diagram, Fig. 9, the solenoid, the-circuitbreaker carried by the car wallyand thecircuit-breaker carried by'the .%OV6IIlOIifI'&IIl6 are arranged in series, they be arranged within the carin easy=reach of the conductor so as to form still another circuit breaker by which the car may be instantly stopped-at: any desired point.

Havingthus described my invention-what 1 claim anddesire to secure by Letters-Patent. 1s

1. The combination with an elevator shaft having vertical strips, the-car, spring actuated: jaws thereon for gripping the strips, and a device-for normally holding saidj aws open; of agovernor wheel carried by the car and rotated by contact with one, of the strips,

bolts through the wheel, weights pivotally mounted on the opposite ends of each bolt,

.independent springs-holding the-weights of eachpair normally at opposite sides of a radius-through their bolt, two pivoted plates standing-respectively in the planes of the weights at opposite sides of the wheel, and

connections between said device and plates whereby the movement of either of the latter will trip the former and permit thesetting of I the grips.

2. The combination with an elevator shaft having vertical strips, the car, spring. actuated jaws thereon for grippin the strips, and an electrical device for norma ly holding said jaws open of a (governor wheel carried by the car. and rotate by contact with one of the otally mounted on the opposite ends of-each bolt, independent springs holding the Weights of each airnormally at opposite sides of a lirough their bolt, circuit breakers standing respectively in the planes of the weights at each side of the wheel, and a circuit including said electrical device and both the-circuit breakers in series.

3. The combination with an elevator-shaft strips, bolts through the wheel, weightspivactuating said jaws, and an electrical device for normally holding said mechanism inoperative; of arms pivoted on the car, a governor wheel j ournaled in their outer ends and rotated by contact with an upright bar of the shaft, a spring actuating said arms to throw the wheel into operative position, devices on the wheel movable radially under centrifugal force, a circuit-breaker adapted to be operated by any of said devices when projected, and a circuit including said circuit-breaker and said electrical device.

4. The combination with an elevator shaft having vertical strips, the car, jaws thereon adapted to grip said strips, mechanism for actuating said jaws, and an electrical device for normallyholding said mechanism inoperative; of a frame pivoted on the car, a governor wheel therein and resting against an upright bar of the shaft, a series of oppositely disposed weights pivoted in said wheel and adapted to be swung outward under centrifugal force, switch plates pivoted on said frame in the path of said weights when projected, sockets with which said plates normally contact, and a circuit including said electrical device and both the switch plates and their sockets in series.

In testimony whereof I affix my signature, in the presence of two witnesses.

GEORGE B. RICE. Witnesses:

F. G. FISCHER, J. MooRE.

Images