US1454125A - Pier door - Google Patents

Description

May 8, 1923. I 1,454.125

j L. MCHARG PIER DOOR.

Filed Aug. 30 1921 2 Sheets Sheet 2 Patented May 8, 1923.

LESLIE MOHARG, OF FREEPOR'I', NEW YORK.

PIER DOOR.

Application filed August 30, 1921. Serial No. 496,800.

T all whom it may concern:

Be it known that I, LESLIE McHARo, a citizen of the United States of America, residing at F reeport, in the county of Nassau and State of New York, have invented certain new and useful Improvements in Pier Doors, of which the following is a full, clear, and exact description.

In a patent granted to me on February 22, 1921, No. 1,369,425, I have shown and described a pier shed door in which the door is composed of two sections the lower section of which, by suitable means, israised until it fully overlaps the upper section, whereupon both overlapping sections are simultaneously caused to travel upwardly and outwardly by grooved guides with which they engage into a substantially horizontal position. Y

In the mechanism shown in the patent for accomplishing this result a counterbalancing weight is used on each side of the door, and two pulleys are employed at opposite ends of a rotary shaft over which chains carrying the weights run, one end of each chain being connected to the bottom of the edge of the lower section and the other to an intermediate part of the edge of the upper section,

It resulted from this arrangement that more space was necessary for the door and its counterbalancing weights than was de sirable, and that when the doorwasfully opened the angle of the chains connected with the middle of the upper sect-ion to the normal plane of the pulleys to which said chains led was such that the chain was liable to run out of the pulley groove, or caused undue friction and wear on the pulley.

These defects it was my object to avoid in devising and constructing the form of li-fting mechanism upon which is based my pres ent application for Letters Patent.

My improvements, in general terms, con

sist in dispensing with the overhead rotary shaft in the use of a single weight connected to lifting chains running over a special arrangement of pulleys, and in swivelling that pulley at each side of the door over which runs the chain connected wi h the middle of the upper section of the door. so'that when the door is fully opened or substantially so,

' the pulley will assume an angle to the vertical which 1 for the angle of the chain.

These improvements are illustrated in the accompanying drawings, in which:

igure '1 is an edge View in elevationof the improved door.

corresponds to and compensates Fig. 2 is a sectional view of one side of the door on the line 2-2 of Fig. 1. Fig. 3 is a front elevation of the door. F 1g. 4 is a top plan view of the same. Fig. 5 is a detailed view of one form. of

a part of the lifting mechanism; and,

Fig. 6 is an illustrative diagram to illustrate the operation of the door. r i

-The door proper may be composed either of two sections adapted to overlap, or of .a single section,

projections 3 which in practice should be rollers to avoid friction, but when raised, is

since the character'of "the device as a whole-requires but littl'eiheadother proper guide 1'is caused to assume a nearly horizontal position, as shown in dotted lines in Fig. 1. The theory of the construction and-operation of the in Figs. 4 and 6, to which reference for the moment is made. At each side of the door 2 and above it, two loose pulleys .4, 5, 6, T are supported by suitable brackets 8 and on one side of the door a shaft at ri ht angles to the plane of the door is mounted on which are four pulleys 9, 10,11, 12 as nearly as practicable, in the plane of the others, and a winding pulley or'sprocket pulleys 9 and 10 are fixed to the shaft and 11 and 12 are loose. 1 Over pulley 13 pames a hand chain 14. shown in Fig. 3, by means of. which the pulleys 9 and 10 are rotated.

Chains or preferably wire ropes 15, 16 and which I shall hereinafter refer to as cords, run over the pulleys in the following manner, the pulleys being shown in the diagram Fig. 6, as of different diameters for sake of illustration. One end of cord 15 is connected to the bottom of the edge of the door and runs up over the pulley 4,

13. Of these thence over fixed pulley 10, thence over one of two idlers 17 in a bracket from which the weight 18 is suspended, thence over the loose pulley 12, thence over pulley 5, and down to the middle or approximately such point on the same edge of the door.

In like manner the cord 16 passes over pulleys 6, 7, 9, 11 andthe other idler 17, so that when the pulleys 9 and 10 are rotated by the hand chain 14, the door is' drawn up by the 7 weight 18 and the force applied to the fixed pulleys.' v As the door rises its upper edge follows the guides'land the door ultimately lies out in the substantially horizontal position shown in Fig. 1, but in this positionit will be seen that the portions of the suspending cordsconnected withthe middle oftheidoor lie at an angle to the normal plane of the pulleys over which they run. shown clearly in Fig. 1.

from the grooved pulleys, to prevent which the two pulleys 5 and 7 are swivellcd,as

indicated, so that in swinging they follow the angle of the cords as indicated in dotted indicated in Flg. 6, or the cords must pass substantially through the centers around which the swivelled pulleys turn, as indicatedin detail in Fig. 5, where the cord is shown as passing through an "opening 19.

This pier door is an improvement on those now in general use in that-it economizes space and parts. The power required to open and close the door is uniform in all positions of the door, and the effects of friction are greatly reduced. The means combined action of the.

This is- Under such cir-' cumstances the'cords are liable to pull off for controlling the door are very simple and not liable to wear or derangement.

What I claim is 1. The combination with a pier shed door of a driving shaft for controlling the same supported at one side of the door, four pulleys on said shaft, two fixed and two loose,

which in opening assumes a horizontal position, of two loose pulleys, over each upper corner of the door, weighted cords running over such pulleys and means for-operating the same for opening or closing the door, one end ofeach cord being connected to the bottom and the otherend to the middle portion of-the edge of the door, and that loose pulley of each pair over which the cord connectedto the middle of the door 7 runs being swivelled so as to follow the angle of such cord" when "the door is brought to'a horizontal position. I 3 The combination with a pier shed door which in opening shifts from a vertical'to a horizontal position, of a pair of loose pulleysove'r each upper corner of the same, one

of eachpair being swivlled, two driving and two loose pulleys at one side of the door andweighted cords passing over all of said pulleys and having their ends connected respectively with the bottom and middle points of the edges of the door, the end of the cords connected with the middle running over the swiveled pulleys, for the purpose set forth.

In testimony whereof I hereto afiix my signature.

LESLIE MoHARG.

Images