US1494061A

US1494061A - Automatic elevator gate

Info

Publication number: US1494061A
Application number: US307812A
Authority: US
Inventors: Christiansen Ludwig
Original assignee: Individual
Current assignee: Individual
Priority date: 1919-06-30
Filing date: 1919-06-30
Publication date: 1924-05-13
Anticipated expiration: 1941-05-13

Description

May 13, 1924, 1,4944061 L. CHRISTIANSEN AUTOMATIC ELEVATOR GATE Filed Juhe 30, 1919 lzzvezzifp Patented May 13, 1924.

UNSILT ED ST A T'ES P TEN T O F F LUDWIG CHRISTIANSEN, OF LYNN, MASSACHUSETTS.

AUTOMATIC ELEVATOR GATE.

Application filed June 30,

T allwhom may concern:

Be it known that. I, LUDwie CHRISTIAN- SEN, a citizen of the United States, residing at Lynn, in the county of Essex and State. of Massachusetts, have invented certain new and useful Improvements in Automatic Elevator Gates; and I do hereby declare the following to be a f ull, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same This invention relates to automatic gates such as are used in connection with freight elevators to prevent accidental entrance into the elevator well when the elevator car is not in position.

The object of theinvention is to provide novel and improved means, actuated by the movement of the elevator car in approach.- ing or leaving a floor, for operating the gate'to respectively openor close the doorwayleading to the elevator well at that floor.

To this end the invention consists in the features of construction, arrangement and combination of parts hereinafter described and referred to in the claims.

The invention will be readily understood from an inspection of the accompanying drawings and the following detaileddescription of the construction illustratedtherein.

In the drawings, Figure 1 is; a view, in sideelevation, of an elevator gate embodying the invention in its preferred form and showing the elevator car in position and the gate raised to give access to the car; Fig. 2 is a detail view, in elevation, of a portion of the gate, looking'from the outsideof the elevator well; and Fig; 3' is a sectional view taken onthe line of Referring to thedrawings; the gate comprises an apron or curtain 4, consisting of a-plurality of' slats 5, arranged side by side and so connected together as to permit the apron to be wound'upon a shaft, roller or drum 6, extending transversely across the top of the doorway of the elevator well. The roller 6', to which the upper endof the apron is-secured, may be of any suitable construction and is providedwith trunnions 7, that are journaled in brackets 8, on uprights 9, at either'side of thedoorway, and

' it is adapted to be rotated in'opposite directionsto wind up or unwind the apron, there 1919. Serial No.- 307,812.

by raising or lowering it; The apron is guided to move vertically in the doorway,

as it israised or lowered, by" means of grooves 10 in theinner sides of-the uprights into which the ends of the slats 5 extend 6 when they are unwound from the roller.

The means for operating the gate comprises two endless chains, one of which serves to rotate the roller and is moved by the other to which it is connected and 653 which is, in turn, moved by the elevator car. The two chains are arranged adjacent each other on the outer side of oneof' the uprights 9 in the relative positions'ill'ustrated in the drawing. The chain which rotates the roller is indicated at 11 and passes over a sprocket wheel 12 that is se-' cured to one of the trunnions of the'roller, and over a similar sprocket Wheel 13' that h is mounted to turn on astud-14 which is 755 adj ustably fixedin a bracket on the upright. The chain which is operated directlyby the-" elevator car is indicatedat 15. The upper portion of the chain 15 passes over and'is guided by two disks 16, which are separated 309 sufliciently' to engage opposite'sides'of the links of the chain, and are severally mounted to turn on the inner ends of two studs- 17, which project inwardly from the oppositely extending arms of a bracket 19011 the upright 9 The disks 16 are spaced apart a sufficient distance to permit thethickened joints of'thelinks in the chain-15 to project between them thus preventing the chain from slipping sidewise from the 995 disks and holding the disks apart; In order that an uninterruptedpassage may bepro videdbetween the disks 16 the studs 17" are constructed so that" their inner'endsdo notproject-beyond the inner surfaces of the disks. The lower portion of the'chain'15 passes over a sprocket wheel 20 that" is mounted to turn on a stud 21, whichi's adjustably fixed in a bracket'on' the upright.

Inorder-that the movements of the chain 15 may be transmitted to the chain 11, the two chains are connected by means of a link or bar 22. The upperend of'the bar22 is hooked around the joint of apairof' links" in the chain 15' between the sides of" the W links, while the lower end of the bar is secured to one of the links of the chain 11 by means ofabolt 23. The greater part ofthe" upper portion of the bar'22 extends-in the central vertical plane of the chain 15' and-is capable of swinging freely between the disks 16 whenever thelinks tO VVh1Ch it is connected pass over the top of the disks 16.

To permit the chain 15 to be actuated by the elevator car, a carriage 24 is provided, which is secured to the chain by means of a hooked bolt 25 and is mounted to slide vertically upon a T-bar 26 which is secured to one of the uprights 9. Two

dogs

27 and 28 are pivoted between the sides of the carriage 24 and are engaged by the opposite ends of a, leaf spring-29, which is secured to the carriage, so that they are normally held in th positions shown in Fig. 1, with their opposed ends projecting in the path of a finger 80 on the elevator car, and with the opposite or tail ends 81 hearing against the bottom of the carriage 2a. 1

r lVhen theelevator car is in position at the doorway, the finger 30 will be located between the opposed projecting ends of the dogs, and the upper pivoted end of the bar 22 will be located at the top of the disks 16, directly above the studs 17, as represented in Fig. 1. A downward movement of the elevator car will cause the finger 80 to engage the dog 27,- pushing the carriage 24 and the adjacent side of the chain 15 downwardly and rotating the disks 16 in a counter-clockwise 'direction, viewing Fig. 1, thus moving the bar 22 downwardly on the left-hand side of the disks 16, and'operating the chain 11 to lower the gate.

In order that the dog 27 may be disengaged from the finger 30 after the gate has been lowered, a trip block 32 is secured to the lower part of the T-bar 26, in the path of the dog 27, and in the proper position to trip, th dog when the gate has reached the required closed position. The tripping of the dog is effected by the riding of the tail 31 over an inclined face on the trip block, which causes the dog to be swung on its piv- 0t, against the tension of the spring 29, withdrawing the projecting lower end of the dog from contact with the finger 30 and permitting the elevator car to continue downward without imparting further movement to the carriage 2 1. The position of the carriage 2i'and the dog 27 after the gate has been lowered" by a downward movement of the elevator car is shown clearly by dotted linesin Fig. 1. j

Anfupwardmovement of the elevator car willibring the finger 3O againstthe dog 28,

and the carriage and adjacent side of the chain 15 will be raised, rotating the disks 16, in a clockwise direction, thus moving the bar" 22 downwardly'at the right hand side ofthe disk16 and operating the chain 11, in the samemanner as before, to lower the gate. 1 WVhen the gate has been lowered sufficiently the dog 28 is tripped by means of a trip block 33, which is located-at the upper end of the T-bar 26. The trip block 33 is the dog 27, the finger 30 will move the carriage downwardly from its position adjacent the trip block 38, to the position indicated in full lines in Fig. 1, thereby raising the gate. It, in approaching the floor, the elevator is moving upwardly, the finger 30 will pass over the dog 27 which is held out of the path of the finger by the, trip block 32, and engaging the projecting end of the dog 28, the finger will raise the carriage from dotted line position to the position shown by full lines, when the, car will be positioned at the doorway and the gate will be raised.

It will be seen that when the elevator car leaves a floor which is equipped with the automatic gate, herein described, the arrangement of the bar 22 with relation to the disk 16 is such that the gate will be lowered, whether the car is moving upwardly or downwardly. Conversely when the elevator car is moving, either upwardly or down wardly, in approaching a floor, the gate will be raised. I

The automatic gate hereinbefore described is particularly adapted for use wherever there is not sufficient room between the top of a doorway and thefloor above to permit the use of an automatic gate of the usual rigid sliding type which is raised bodily above the doorway to permit access to the elevator car.

While it is preferred to employ the specific construction and arrangement of parts shown and described, it will be understood that this construction and arrangementis not essential, and may be varied and modified without departing from the invention.

I Having explained the nature and object of the invention, and specifically described one form of device in which it may be embodied what I claim is 1. A gate for the doorways. of elevator wells, comprising a roller, a flexible apronsecured to the roller for closing-the doorway when the elevator car isnot in position to be entered, a sprocket wheel connected with said roller, an endless chain passing over said sprocket wheel for rotating the roller to raise or lower the apron, an idle wheel over which said chain passes, a second endless chain adapted to be operated by the movements of the elevator car, means mountwheelfor supporting and guiding the second chain, and a link connecting said chains, the link and the chains being so arranged that the upward or downward movement of the car in approaching a floor will cause the roller to be rotated in one direction to raise the apron, and the movement of the car in leaving the floor will cause the roller to be rotated in the opposite direction to lower the apron.

2. A gate for the doorways of elevator wells comprising a roller, a flexible apron secured to the roller for closing the doorway when the elevator car is not in position to be entered, a sprocket wheel connected with said roller, an endless chain passing over said sprocket wheel for rotating the roller to raise or lower the apron, an idle sprocket wheel over which said chain passes, a second endless chain arranged adjacent the first mentioned chain, means for supporting and guiding the second chain in a substantially vertical plane, a member connecting said chains and so arranged with relation to the chains that the motion of the second chain will be transmitted to the first chain, a device on the second chain adapted to be engaged by a member on the elevator car, and means for actuating said device to disengage it from the member on the elevator car when the apron has been lowered to a predetermined extent. 8. A gate for the doorways of elevator wells comprising a roller, a flexible apron secured to the roller for closing the doorway when the elevator car is not in position to be entered, a sprocket wheel connected with said roller, an endless chain passing over said sprocket wheel for rotating the roller to raise or lower the apron, an idle wheel over which said chain passes, a second endless chain arranged adjacent the first mentioned chain adapted to be operated by the movement of the elevator car, means for supporting and guiding the second chain in a substantially vertical plane, a member connecting said chains to transmit the motion of the second chain to the first chain, said member being so arranged that when the apron is raised to its highest point the connection between said member and the second chain will be at the highest point in the second chain. a

4. A gate for the doorways of elevator wells comprising a roller, a flexible apron secured to the roller for closing the doorway when the elevator car is not in position to be entered, a sprocket wheel connected with said roller, an endless chain passing over said sprocket wheel for rotating the roller to raise or lower the apron, an idle wheel over which said chain passes, a second endless chain arranged adjacent the first mentioned chain adapted to be operated by the movement of the elevator car, a pair of oppositely arranged disks separated by an unobstructed space and adapted to support and guide the second chain, a pair of opposed projecting studs upon the ends of which the disks are severally mounted to turn, a bar pivoted at one end to the second chain and secured at the opposite end to the first chain and adapted to pass freely between the disks when the portion of the second chain to which the bar is pivoted passes over the disks.

LUDWVIG CHRISTIANSEN.