US1436137A

US1436137A - Elevator floor safety switch

Info

Publication number: US1436137A
Application number: US524241A
Authority: US
Inventors: Curtis M Aldred
Original assignee: Individual
Current assignee: Individual
Priority date: 1921-12-22
Filing date: 1921-12-22
Publication date: 1922-11-21
Anticipated expiration: 1939-11-21

Description

APPLlcAnoN nifgp name2. 1921.

Patented Nov. 21, 1922.

C. M. ALDRED.,

ELEVATOR FLOOR SAFETY SWITCH. APPLICATION FILED DEC.22. I92I.v

4 SHEETS-SHEET 2.

IIIIl IIIIIII CMLQREQ SII Patented Nov. 2L i922.

r1 -umx for C. M. ALDRED. ELEVATOR FLOOR SAFETY SWITCH. APPLICATION FILED Dc.22. 1921.

atented Nov. 21, 1922.

4 SHEETS-SHEET 3.

C. M. ALDRED. ELEVATOR FLOOR SAFETY SWITCH. APPLICATION HLED DEc.22. 1921.

1,436,137* 4 Patented. Nov.'21, 1922.

4 SHEETS-SHEET 4.

Patented Nov.. 2l, 1922.

*ii-TED STATES CURTIS M. ALDRLED,y 0F CHARLOTTE'. NORTH'CA'ROLINA.

ELEVATOR FLOORl SAFETY SWITCH.

Application filed December 22,1921'. SerialNo'. 524,241'.

T all.' who/mit 'may .concer/n.'

Be it'know-n that I, CURTIS M. ALDRED, a.

'andA iiseiul-y Elevator Floor Safety Switch', of

which the following isaspecificationly rlfhe object of. my invention is-'to. pro.vi de a: novel apparatus for'use in connection. with elevators to protect both the elevator. and freight or passengers on same, by causing the: elevato-r.` to: stop in the' event that lany object projects out ofA the elevator while itis operating; and it. is anV especial. object of iny invention `to provide thenovelf safety switch disclosedv and the novel arrangement cfa means'for operating; said switch. I attain these and other objects of my invention by the. mechanism illustrated. in the' accompanying drawings, in .which Figure 1- is a frontelevation of the appar'atiisinstalled for two or more floors;

Fig:v 2 is atop plan of theiapiparatus: arranged. about theA elevator hatch;

Fig. 3l is afront elevation.. showing h 'ow projecting freight on' the' elevator engaging the safety wire trips the switch to-stop.v the elevator. Y

Fig. 4. is a front view of. the switchwith cover removed Figi. isca rear-view oil theyswitchr;` 4

Fig; 7i isatopview. ot member 7 Fig. 8 is a side elevation of members 6g 7 and:y 8; v

Fig. 9 is ai bottom plan-cf pulley 8;

Fig. 10v is a side elevation or members'- 6 and 9J;

Fig.v 11 is'a similar view at'. right-angles to Fig-10;: l

Fig; 12 is an elevational view of memberj10;

Fig. 13 is` a similar. viewat right angles toFig;.12"; and.

Fig. 14 is al detail elevational viewv of member 111. I

- Likecliai'acters ot referencedesignatelike partsfiir each of the several views. p

Reerringfto Figsl7 2 and 3-,theieis1illustrated an elevatorl sha-ft or hatch 2 having 2in--elevator 3 which is guided by the' guide posts 1, all of usual constructioman elevator of thev freight-carrying type being illustrated; On elevator. 3, in Figs. 1 andV 3v is illustrated an article offreight 4 which has been carelessly placed on. the elevator soy that a corner of it protrudes beyond the elevator hat'chi in ai position to contact with the switch-operating safety or guard wire or cable'- 5'. I-t.' will olf' course be understood .that member 5 may be either a wire, cable orichainof any suitable material. I provide .suitable-pipes 35 through" which the wire 5 is.y run and; which protects the wire. Attachedik to the ceiling by flanges 7 are suitablepulley" hangers 6" carrying suitably arranged? pulleys, suchy as the vertically arranged: pulleys 9 andj the horizontally arranged p'ulleys 81 as required bythe particular installation conditions. I also provide suitable screw-eye: pulleys 10 where it is necessary fortlie cablek 5 to be positioned in proximitytoithe ceilingor wall. I also provide a turn buckley 12a's illustrated in Fig. 2. wli'ere-v desirableto effect a proper-operationl of the: apparatus. Y

Theend' of wirel or cable 5 is operatively connected'v with` switch lever 14: in some suitablemanner, preferably by the link 37 illustrated in Figs. 4. and 5, and which detachably engagesv the outer end 15 of lever 14. I providea'. suitable cas'ingl for the switch mechanism. Lever 14: isimounted on casing 16 byy means of a suitable pivot- 17. The inner end.. of lever. 142 normally engages the freef end. ofcontactinglever 18, which latter lever. isfpinned on ther-square shaft 19. The lever. 18i` isl heldv to its normal position by a. suitable spring 2O which connects the lever 1 8.` tof the casing 16 under spring tension. Spring 20-f is. secured to casing 16 by any suit-able means such; as: the adjustable fastening,211, and isfsecured to' lever 18 by any suitable ineans such as the clevis 22. I also provide' a suitable stop` 23 on casing 16 positioned to@y engage lever 18 after it has been released' by lever 14; I providenotch 36 for link 37. onv` the end of lever 14.

Referring to Fig.. 4, I provide suitable insulations 24 forthe'- square shaft 19 which issecured-ito theA contact. aiin 25 by a suitable clamp=-26- Mounted on the end of contact ari'n-v 25 is ai suitable contact member 2T and which is. provided With a cushion-spring 29 interposed between thel head of the Contact membery 2T and the contact arm, whereby the' member 2T has a degree ofv cushioning. The head of contact ineinber 2.7 normally engages the contact ineinber 28, which latter is connected with the electricaly conductor 34 while contact 27 is connectedJ with the electrical conductor 33 in the electric controlled circuit which operates the elevator in a suitable conventional manner. I provide insulated washers 30 on contact member 28, as shown in Fig. 4, to insulate same from the metal support 31, mounted on or integral with cover 32, as shown in F ig. 6.

Square shaft 19 is machined on each end and the switch casing and cover are drilled to receive the shaft, one end of which projects through the casing, as shown in Figs. 6 and 5.

The switch mechanism 13 is wired intoelectric connection with any controlled circuit of switch board or any electric apparatuses for controlling passenger or freight elevators. The switch is held in its normal position, as shown in Fig. 5, by the safety or guard wire 5 which is placed around the elevator hatch either plumb with the floor, or suitably spaced between the iioor and elevator hatch so that projecting freight on the elevator that might otherwise catch or hang on the floor or ceiling, when the elevator is ascending or descending, would come into contact with the safety wire 5 with the result that the increased tension would swing lever 141. free from lever 18. The link 87 attached to the end of wire 5 will slip off from the notch 36 on the end of lever 14, thereby reventing the wire from being broken. PLever 18 being disengaged from lever 14 will move in the direction of the arrows in Fig. 5 under the tension of spring 20, and correspondingly move the shaft 19, which in turn will operate the'contact arm 25 and the contact vmember 27ste break its electrical contact with contact 28, thereby opening the controlled circuit through the switch board or controlling system of the elevator and stop-ping the elevator automatically.

The length of rods 6 which carrythe pulleys 8 and 9 over which the safety wire 5 is mounted is determined by the time required for the car to stop after the switch is thrown. f

Whenever there is only one opening in the elevator, or the elevator is protected `by an enclosure, except for one instance, the wire 5 will be arranged as shown in F ig.v1.

If the switch mechanism is not properly adjusted or if the safety wire 5 becomes slack or breaks, the elevator will not run; This result affords protection `to bot-li the elevator, freight, or passenger, as thesafety wire holds the switch closed in running position under normal conditions. If the safety wire breaks it throws the safety switch to stop the elevator. The switch may be used for either I). C. or A. C. current, two

phase and three phase and with any suitable contact elements and contact arms.

It is understood that I may make any suitable modiication in the details of the mechapermit the stopping of the elevator before nism disclosed not involving a departure of the principle of construction and operation disclosed and hereinafter claimed.

Vhat I claim is 1.V In a protective apparatus for elevators, the combination of a wirearranged around and in close DroXimitv to an elevator hatch, meansfor supporting the wire in the desired relation to the hatch, an electric switch mechanism with which the wire is operatively engaged, the normal tension of the wire functioning to hold the switch yin the normal running or closed position, the switch kbeing arranged to operate the elevator controlling apparatus and stop the elevator when operated by any interference withl the normal tension of the wire on the switch by a protruding object engaging the wire. l

the combination of a'wire arranged around and in close proximity to an elevator hatch, means for supporting the wire in the predetermined relation to the hatch required to itreaches a floor after operation of the hereinafter mentioned switch mechanism, an electric switch having an operating lever releasably engaged by the aforesaid wire the normal tension of the wire functioning to hold the switch in the normal runningor closed position, the switch being arranged to operate conventional elevator controlling apparatus to stop the elevator when the wire is 1engaged by any protruding object on the elevato-r. v

3. In an elevator floor safety switch, the combination with contact members connected with electrical conductorsin circuit with electrical elevator operating apparatus, a switch casing having a bracket support on which one of the contact members is rigidly supported, a swingablecontact arm on which the other contact member is movably mounted, a shaft on which the contact arm is 110 clamped. a lever aflixed to said shaft to control its position and movement, a second pivoted lever operatively engaging the lever attached to the shaft and holding the latter Ain its normal position under a degree of tension, a spring regulating the tension, and a guard wire detachably engaged to the outer end of the second lever, said wire being suitably disposed around and in proximity to the elevator hatch, whereby any protruding object on the elevator will engage the wire and Voperate the switch, and whereby a similar result will follow if for any reason the wire becomesslack or is broken, thus stopping the elevator and per- .125 initting accidents.

4. In an elevator floor safety switch, the combination with contact members connected with electrical conductors incircuit with 'electrical elevator operating appara- 130 tus, means for supporting one of the contact members in stationary position, means for supporting the other contact member in 4movable position but normally in contact with the other contact member, adjustable spring tensioning means normally functioning` to retain the movable contact member in contact with the stationary Contact member, a pivoted lever engaging the means for supporting the movable contact member but releasable therefrom under increased tension, and a guard wire attached to said lever and arranged around the doorways of the elevator hatch in p0- sition to be engaged by any object protruding from the elevator; whereby to operate the switch under such conditions and stop the elevator and avert accidents.

5. In combination with the apparatus described in claim 4, rods mounted on the ceiling or floors of the building in proximity with the elevator hatch, said rods having suitably disposed pulleys for supporting the guard wire at a distance of predetermined eXtent from the floors or ceiling to allow time for the apparatus controlling the elevator to bring same to a stop before reaching the ceiling or floor following the tripping o-f the safety switch by the operation of the guard wire by any protruding object.

CURTIS M. ALDRED.