US1262831A

US1262831A - Elevator safety device.

Info

Publication number: US1262831A
Application number: US5476815A
Authority: US
Inventors: George Nissenson
Original assignee: Individual
Current assignee: Individual
Priority date: 1915-10-08
Filing date: 1915-10-08
Publication date: 1918-04-16
Anticipated expiration: 1935-04-16

Description

v G. N'ISSENSON;

. ELEVATOR SAFETY DEVICE. APPLICATION FILED ocr. 8. m5.

Patented Ap 16, 1918.

2 SHEETS-SHEET l- 5 nuewfoz G. NISSENSON.

ELEVATOR SA'FETY DEVICE.

APPLICATION FILED OCT-8.1935.

Patented Apr. 16(1918.

2 SHEETS-SHEET 2.

GEORGE 'ivrssnivson, or -1vnw YORK, n. Y.

- ELEVATOR SAFETY DEVICE.

- Application filed October 8, 1915.

To all whom it may concern.

Be it known that I, Gnonen' NIssENSoN, a citizen of the United States, and a resident of the city of New York, borough of lVIanhattan, in the county and State of New York, have invented a new and Improved Elevator Safety Device, of which the following is a specification.

My invention relates to safety devices for elevators, lifts and similarly operating apparatus, and to means of controlling and starting a water, steam or otherwise operated elevator machine, which control is dependent upon and correlated to the position of the elevator car, platform andthe like, and of the door or doors of the elevator shaft, the object of the present invention being to provide an automatic device, whereby, when a door of the elevator-shaft is opened to permit access to or egress from an elevator car, )latform or the like, the operating sheave or part of the elevator will vbe clutched or locked, and will remain .so clutched or locked duringthe entire time that the door so remains open and will prevent the starting of said elevator car, platform or the like, until the said door is 7 closed and locked.

The invention consistsof novel parts,and combinations of the same, as hereinafter more fully described, and as pointed out in the claims.

A practicalembodiment of the invention is represented in the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in. all the views.

Figure 1 is a front view of the device, as arranged for attachment in the operation of a hydraulic elevator, showing the toothed plate engaged with the toothed rack, attached to the rim of an operating sheave, commonly in use to control the admission and release of water pressure to and from the cylinder of an elevator machine.

Fig. 2 is a similar View showing the toothed or grooved plate, disengaged from the toothed or grooved rack of the rim of such an operating sheave. I

Fig. 3 represents the door switch: attached to the door frame of an elevator-shaft door, with the electric contact shown to be separated upon the door being'closed.

Fig. 4 represents the door switch, at-' Specification of Letters Patent.

Patented Apr. 16,1918.

Serial No. 54,768.

tached to the door frame of an elevator shaft door,-showing door partly open and switch contacts engaged.

The device consists of a standard electric lifting solenoid 1, mounted and made fast to an iron frame 2, by

bolts

2 and 2 The solenoid 1 is connected by means of acornplete wire circuit with a door switch 40. lVithin the core of the solenoid l is a movable member 3, which has a slight inward movement as soon as an electric circuit is established through the said complete wire circuit. The solenoid 1, its movable member 3, and the frame 2, which form a power unit, are joined to and made permanent with the member of an iron bracket 4, by means of bolt 5, and bracket 23. The frame is strengthened by a brace 6, fastened together with the

bolts

6 and 6. Within this

frame

4, 4 and 6 is mounted the mechanical movement of the device, which consists of a movable rod 7, one end of which extends through'frame member 4 and isprovided with a screw thread 11 to receive the movable member 3, the latter having in its center acorresponding threaded aperture to allow the threaded end 11 of the rod 7 to be introduced or withdrawn so as to'permit of its adjustment to the required length, after which adjustment it is locked with the lock nut 12. The other end of said movable rod 7 extends through a bracket Sto receive a spiral spring 9 and nut 10 toretain the spring. A collar '20, fitted on rod 7 and set screw 21 are also provided for adjustment of the distance of travel of movable member 3 and rod 7, a shifting of the stop c0llar'20 toward the bracket 8, shortening the"distance' of travel of rod 7 and member 3. An aperture 22 is provided in movable rod 7 to engage one end of a lever 24, pivoted at its median distance on the bracket 23. The other end of lever 24 is connected with lever 29 by means of a link 25, pivoted at 26 and 26*. Link 25 is introduced into and moves freely within a slotted aperture 34, "provided inthe brace 6 offrame'4," 4, the said free movement of the link 25 within said slotted aperture being produced whenever 25 and of lever 29 by introducing the pivot 2o into one o1 the apertures 30. @ne end of the lever 29 is pivoted upon brace 6 at 27, and the opposite end is free. The lever 29' has a radial movement upon its fixed or pivoted end 2?, which movement is actuated .set to engage a corresponding toothed or grooved rack 32, which is attached to an operating sheave 33 or the like, by bolts 35 or other suitable means. The electric solenoid l, and its movable member 3, are operated and controlled by means of a switch 40, which comprises outer frame or casing 48 and a push rod 41, partly protruding through an aperture in one side of sald frame or casing 48 and moving in and through said aperture. Push rod 41 has at its inner end an insulating plate 42, the ends of which are carried and move upon two

stationary guide rods

49, 49, through an aperture at each end of plate 42, provided for that purpose, said

rods

49, 49 being fixed to opposite sides. attached to and carried by push rod 41 and msulating plate 42 is a knife blade 43. The push rod 41 1s normally held in forward position by means of springs 44, carried on the

guide rods

49, 49, and hearing at one end agamstmsula g plate 42. The second and stationary insulating plate is fixed within the frame or casing 48 upon the side through which push rod 41 protrudes and is provided with an aperture in line with that on the same side 01": the frame or casing-4 8, so as to permit push rod 41 to move in line through plate 45 and the side of frame 48-. The insulating plate 45 carries electric con.-

nections

46, 4?; which are arranged for engagement by knife blade 43. Knife blade 43 engages the

electric connections

46, 46 when push rod 41 and plate 42 are in for ward position, thereby completing the electric circuit to the solenoid, and only becoming disengaged and breaking said circuit when push rod 41 and plate 42 are depressed by pressure against the outer end of 'pushrod 41. By 4'? is represented conventionally a door of an elevator shaft, whichin Fig. 4 is shown open and without its pressure exerted upon push rod 41, which through the action of the springs 44., 44 bearing upon plate 42 is in its forward. position when the knife blade 43 is in contact with the

electric connections

46, 46; and in Fig. 3 is shown closed, with its pressure exerted upon push rod 41, which,'with plate 42 and knife blade 43, are thereby depressed, the knife blade 43 being then out of contact with the

electric connections

46, 46..- Although the form of switch described is preferred for use in connection with the neease device, it may be replaced by any other "form of switch or other contact making and breaking means.

From the above description it will be evi lent tiat as soon as a complete circuit is movement bringing the position of the link 25 directly in line with. the position of lever 24 at 26. The movement of lever 29 will cause the toothed or grooved block 28 to entire toothed orgrooved rack 32, attached to the operating sheeve 33, and there by will prevent the rack and the operating sheave from turning and will keep it in a stationary position. ddZhGll block 28 and rack are thus engaged, lever 24 and link 25 being placed in a straight line with reference to each other and rigid, will prevent the pressure of the operating sheave 33 on block 28 from breaking the line of rigidity of lever 24 and link 25.

will remain thus engaged or clutched until the electric circuit is broken by the door switch contacts being separated when the door is closed (as in Fig. 3), when the action of the spring 9 will pull the movable rod 7 back to its former position, and the motion being imparted to lever 24 and link 25 will bring them back to their respective former positions, and the lever 29 connected with them will consequently disengage the toothed or grooved block 28 from the toothed or grooved rack 32, which is attached to the rim of the operating sheave 33 or the like, thereby permitting the free movement of the latter in any direction and placing the elevator machine again in motion.

When the elevator has been stopped at a given floor, it will be understood that some part of the toothed rack 32 stands opposite to some part of the toothed bar 28. As is well known, there is considerable leeway in finding the neutral position of the operating sheave. The present device is so constructed that, no matter how slightly the toothed rack of lever 24 will be imparted. 'to lever 29 by means of the link 25, the said Lever 29 and rack 9 and bar may overlap, an efi'ective locking action will be secured when the door is opened, holding the controller in neutral position, thus operating the electrical connec tions from the door switch or detector 40, wiich thrusts the toothed bar' toward the controlling sheave. The

toggle

24, 25 not only thrusts the toothed bar toward the sheave, but when the teeth are engaged it looks them positively against an accidental displacement. This effective locking is obtained no matter at what part of its neutral position the sheave may stand, so long as one or more teeth of the bar overlap one or more teeth of the rack. In consequence of this no longitudinal adjustment of the bar or rack is needed, since they will operate means, and although this device is shown to be operated by electric power acting through the door switch upon the lifting solenoid of the device, this power may be substituted or replaced by air, oil or water pressure, in which case the solenoid is to be substituted or replaced by a cylinder and piston, or other similar equivalent mechanical means.

I claim as my invention:

1. An elevator safety device, including in combination, a rotatable controller for controlling the power apparatus, a detector operated by the closed or unclosed condition of an elevator door, a peripherally operating locking means adapted to positively engage and lock the controller in any position Within the range of its neutral movement, and connections from said detector for operating said locking means when the door is not properly closed, said locking means comprising a pair of toothed racks, one on the controller periphery, and said connections comprising a toggle for forcing the other rack into engagement with the first.

2. An elevator safetydeviee, including in combination, a rotatable controller for controlling the power apparatus, a detector operated by the closed or unclosed condition of an elevator door, a peripherally operating locking means adapted to positivelyengage and lock the controller in any position within the range of its neutral movement, and connections from said detector for operating said locking means when the door is not properly closed, said locking means comprising a pair of toothed racks, one on the controller periphery, and said connections comprising a device for forcing the other rack into engagement with the first.

GEORGE NISSENSON. Witnesses:

DOROTHY G. SAMUELS, JOSEPH F. CATEE.

Copies of this patent may be obtained for five cents each, by addressing the "Commissioner of Patents,

Washington, D. G. s