US1293668A

US1293668A - Elevator control.

Info

Publication number: US1293668A
Application number: US80218113A
Authority: US
Inventors: Edwin F Banfield
Original assignee: Individual
Current assignee: Individual
Priority date: 1913-11-21
Filing date: 1913-11-21
Publication date: 1919-02-11
Anticipated expiration: 1936-02-11

Description

E. F. BANHELD:

ELEVATOR CONTROL APPLICATION FILED NOV. 2|. ms.

1,Q93,668. Patented Feb. 11,1919.

2 SHEETS-SHEET I.

E. F. BANFIELD.

ELEVATOR CONTROL.

APPLICATION FILED NOV. 21, 1913.

Patented Feb 11, 1919.

2 SHEETS-SHEEI 2.

ulr l nnwrn r. nan'rrnnn, or new "roan, n. r.

ELEVATOR CONTROL.

7 Specification of Letters Patent.

Patented net. i i. leis.

Application filed November 21, 1913. Serial No. 802,181.

T 0 all whom it may concern:

Be it known that I, Enwin F. BANFIELD, a citizen of the United States, and a resident of the city of New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Elevator Control, of which the following is a specification.

' This invention relates to improvements in elevator controls. J

One of the objects of the invention is to providean improved elevator control wherein the operation of the elevator car is im possible unless the car door is closed.

Another object is to provide an improved elevator control wherein the car is stopped whenever the car door is opened.

Another object is to provide an improved elevator control wherein both the cardoor and the shaft door must be closed before the elevator can be operated.

Another object is to provide an improved elevator control wherein the operator may stop the car in any position in the shaft by merely opening the car door.v

Another object is to provide an elevator control, under the influence of the car door, which dispenses with the necessity for a multiplicity of electrical circuit contacts and connections at the elevator landings or within the car.

A further object is to provide an improved elevator control wherein the control devices are not readily accessible to the car operator and consequently cannot be easily rendered inoperative to allow the car to be run without the door thereof being closed.

Another object is to provide an elevator control which is simple, reliable and eflicient.

Other objects and advantages of the invention will appear from the following description and claims.

. In the embodiment of the invention illustrated in the accompanying drawings, a

flexible cable, extending along the elevator shaft, ismechanically controlled by the 0pera'tion of the car door to control the-application of the driving power to the car so that the car cannot be started until the door thereof is closed and may be stopped by the simple act of opening the door regardless of the condition of the operators ordinary means of control. As a further security against accidentthere is provided an interlock between the car and shaft doors whereby, if desired, both doors must be closed before the car can be started. The improved control is shown in connection with a hydraullc or air power supply system, but it will be understood that it is readily susceptible for use with other systems or power supply.

One embodiment of the invention is illus trated in tli'e accompanying drawings.

The views of the drawings are. as follows:

Figure l is a front elevation of the control mechanism, the elevator shaft being shown in section andthe elevator being indicated in dotted lines.

Fig. 2 is a front elevation of the elevator showing the parts of the control mechanism which are carried by the elevator car.

Fig. 3 is an explanatory figure showing the manner in which the cable is deflected when the car door is opened.

l ig. 4: 1s a horizontal section showing the -means carried by the car door for operating the cable and also showing the interlock between the car door and the shaft doors.

Fi 5 is a sectional view of the valve whic is operated by the cable.

Fig. 6 is a vertical section showing the manner in which the weight at the end of the cable'is mounted.

Fig. 7 is a vertical section of the motor that renders the elevator operating means operative and inoperative, and

Fig. 8 corresponds with Fig. 7 showing the parts in the position which they assume when the elevator operating means has been shifted to and is locked in its inoperative position.

An elevator shaft A provided. with doors B at each landing has an elevator car C adapted to travel up and down therein. A wire rope, cord, or tape ll), preferably of high tensile strength and of flat cross-sec tion, as for example a tape of high tension steel. is suspended vertically from top to,

bottom of the shaft A adjacent to a door E ill) of the car C. The cable D is fastened at its upper end at a point in the shaft above the highest point the top of the car ascends to as the car travels in the shaft A, and is kept under proper tension in any suitable manner. In the embodiment illustrated the tension is provided by a weight F fastened to the lower end of cable l) and guided by guides G. in the hydraulic type of elevator chosen for illustration the cable controls a fluid lllti lid . p I motor which, in turn, controlsthe elevator nection either with cable 'I) or with the weight F. Usually it is moreconvenient to.

connect the lever h with the weight F, as

.shown in Figs. 1 and 6.

At a suitable point adjacent to the elevator car door E is fastened a bar J, carrying a roller K to actuate the cable D by defleeting the same when the door Eis opened. When the car door E is of the ordinary folding type the bar J is preferably secured to the door E near its outer side, where the after described.

motion of the door is the more rapid; and to increase the efl'ect on the flexible cable D. the cable is' preferably guided by guide rollers L, L pivoted at the top and bottom of the elevator car C. These rollers contact with the cable D on the opposite side thereof from that on which the roller K contacts. The cable D preferably threads through a yoke at the end of the bar J, in which yoke the roller K is pivoted.

It will be evident from the foregoing dc,- scription, that, when the door E'is open, the cable D will be deflected between the rollers L L and its lower end and also the weight F will be drawn up, and, therefore the valve H will be correspondingly operated. This operation of the valve H will cause the operation of the differential motor and the looking or releasing of the means for starting the car in the manner herein- The valve H is connected with a pipe viz, supplying operating fluid under pressure. which fluid is preferably but not necessarily compressed air, from a. suitable air comprcssor or storage reservoir. Pipe m is also connected with a cylinder 0. The valve H is also connected by pipe 0 with a larger cylinder P, and with an exhaust n. The valve and pipes are so arranged that the pressure fluid is always admitted into the smaller cylinder 0, but is only intermittently admitted to the larger cylinder P, and when the valve H shuts off the fluid from the cylinder P it opens this cylinder to the ex- I haust n.

An operating lever h, of valve H has a pin-and-slot con-- neoaoee lever T, is connected to the piston rod 7, the I carries a rollerZ, which is adapted to en- 'gage a cam U fastened on the sheave V,

shaped that the entrance of the roller Z into the cam groove will force the cam and sheave to the middle position and lock the sheave against movement. The cam groove is'formed at its inner part with a socket for the roller Z.

While this invention is adapted to prevent the starting of an elevator car when the inner, or car door, is opened, it is also arranged so as to insure the closing of the outer or shaft doors,-that is, doors opening into the shaft A at landings,before the car can be started up or down from a landing. To effect this, in cases where the outer doors are closed by hand by the elevator at tendant, I place on the outside of the inner, or car door a flange Y extending vertically from top to bottom of the inner door, in such a position as to contact with a lug or roller X on the inside of the outer or shaft door B, when the inner door is closing. The top and bottom ends of the flange Y, are beveled as shown, in order to lessen the shock of contact of the flange Y with the lug X when the car C is ascending or descending.

The operation is as follows, assuming that the car C is at a landing and that the car door E as well as the shaft door B are open.

In this position the cable D will have been deflected as hereinbefore explained, and therefore the .valve H will have been thrown to the position wherein the fluid pressure will have been cut off from the larger cylinder P. and the cylinder P will have been, connected with Lheviexhaust 11. Therefore, the pressure of the 'operating fluid on the relatively smaller piston R of the smaller cylinder 0 will shift the piston R to the position shown in Fig. 8..and the cam U and lltlt sheave V will have been forced to their middle position. the car stopped-and the sheave V locked. so that. the car cannot be started again until the sheave V is released.

it contacts with the lug orroller X on the outer or shaft door B, and\forces the shaft 'door also to fully close and latch. As the car door E comes to its closed position, the cable D straightens under the pull of weight F. and the valve H is shifted to a position wherein the fluid ressure isadmitted to the larger cylinder and the eiihaust m is closed. Now the pressure-of the operating rec memos fluid on the larger piston S is greater than the pressure of the tiuid on the smaller piston R, and the lever Tis oscillated so as to t withdraw the cam roller Z from the cam 'o groove, whereby the sheave Y is released and is free to be moved by the elevator car attendant through the cable or shipper d". The attendant by his hand cable or shipper -ll 'can now start the carin the usual manner. li nen the car comes to a landing the elevator car attendant stops the car by operating his hand cable W so .as to bring the sheave and cam to the middle position. Then as he opensv the car door the cable I) is deflected. and the valve H is thrown to a position whereby the fluid. pressure is cut oil from the larger cylinder P, and the exhaust, is opened as hcreinbe'lore described. N ow the duidin the smaller cylinder lifts the piston R and forces the roller Z into the cam groove, thereby locking the cam U and the sheave V so that the attendant cannot start the car until the door ll, as well as the door 31 is closed again.

-t will of course be understood that the uter or shaft doors B may be arranged to be closed by any suitable door closing" device. instead'c-f by hand.

ltow having described my improvements, 1 clainras my invention.

1. The combination with an elevator controller of means for rendering the controller tme rative'and inoperative, a cable extending calong the hatchway for operating said means, and means whereby the elevator car door may operate said cable in any position ot' the elevator.

'2. The combination with an elevator and operating means therefor, of a cable extendtil the elevator car door, and means controlled said cable tor controlling; said operating means.

The combination with elevator power supplying means, of means for. renderingthe same operative and inoperative, a cable extending through the hatchway tor operating said last named means, and means whereby the elevator car door may operate said cable in any position of. the elevator.

4c. The combination with elevator power supplying means. of means for rendering the same operative and inoperative, a cable extending: through the hatchway for operating said last named means. means whereby the elevator car door may operate said cable in any position of the elevator, and means for preventing closing of the elevator car door until the hatchway door is closed.

5. The combination with an elevator of means for controlling the power supply to the elevator operating means, said means having an operating sheave provided with a cam recess therein, a cooperating cam arm having means for operating it to positively lid tall

log along the hatchway and operated bypositively shut oil and the'power controlling means locked against operation until the car door is closed.

6. The combination with an elevator of means for. controlling the power supply to the elevator operating means, said means having anoperating sheave provided with a cam recess therein, said sheave being con trolled from the elevator. at, a cooperating cam arm having; means for operating it to positively move the power controlling means to a position to shut oil the, power and locking it therein, said cam operating means be-' ing controlled by the elevator car door so that.- when the car door is opened the power is positively shut otl and the controlling means locked against operation until the carfdoor is closed.

The combination with an elevator of means for controlling the power supply to the elevator operating means, said means being controlled from the elevator car and having a cam surface associated therewith, a cooperating eam,-a hydraulic cylinder of relatively small size by which said cam is biased to a position to positively move and loclr said power controlling means in a po sition to shut off the power, a hydraulic cylinder of relatively large size for also controlling said cam and which acts to move the cam to a position to unlock said power controlling means, a controlling valve for controlling the power supply to said cylinders, a cable for actuating said controlling valve and extending through the elevator hatchway, a weight for maintaining said cable in a substantially perpendicular line when the car door is closed so that the con trolling valve admits power to both cylinders and unlocks the power controlling means, the car door being arranged to move the cable laterally to shorten its effective length as the car door is opened to thereby allow the relatively large cylinder to ex haust whereby the small cylinder positively causes the power controlling means to be moved to a position to shut oil the power and locked therein.

8. The combination with a hydraulicallyoperated elevator of a valve for controlling the power supply to the elevator operating means, a sheave for controlling said valve and operated from the elevator car, a cam recess in said sheave, a pivoted cam arm cooperating with said recess, a hydraulic cylinder of relatively small size for biasing the cam arm into the recess to positively move and lock the sheave in a position to shut oft the power, a hydraulic cylinder of a relatively large size for moving the cam too from said recess to unlock said sheave, a

controlling valve for controlling the supply of power to said cylinders, a cablein the elevator hatchway for controlling said controlling valve, a weight for normally maintaining said cable in a substantially perpendicular line so that the controlling valve is normally biased to a position to admit the sheave, said cable being interlaced with power to'both cylinders whereby the large cylinder overcomes the smaller and unlocks the elevator car door so that when the car door is opened the cable is moved laterally dering said means inefi'ective for controlling the-raising and lowering of the elevator car, a cable extending along the elevator hatchway for controlling said mechanism, and

means influenced by the elevator car door for operating said cable.

10. The combination with dill elevator car and a controller for controlling the operation thereof, of a cable extending along the elevator hatchway and afi'ected by the opened and closed condition of the elevator car door, and means cooperating with said controller and said cable for preventing the operation of the controller when the .car door is open and allowing the operation of the controller when the car door is closed.

11. The combination with an elevator and operating means therefor, of a member extending along the hatchway and actuated by the elevator car door, and means controlled by said member for controlling said operating means.

Signed at New York city, in' the county of New York, and State of New York, this 19th day of November, A. D. 1913.

EDWIN F. BANFIELD.-

Witnesses: v V. P. TRAVERS,

WALTER.U. HARRIS.