US1625083A

US1625083A - Compensating rope for hoisting apparatus

Info

Publication number: US1625083A
Application number: US735180A
Authority: US
Inventors: Hymans Frederick
Original assignee: Otis Elevator Co
Current assignee: Otis Elevator Co
Priority date: 1924-08-30
Filing date: 1924-08-30
Publication date: 1927-04-19
Anticipated expiration: 1944-04-19

Description

Aprll 19, 1927. F. HYMANS COMPENSATING ROPE FOR HOISTING APPARATUS Filed Aug. 50. 1924 l 0 U A L \\\\\\H r/ r r/// //7 /d g A. v 3 6 6 5 6 74% V/ /////V .F/aZ 1 anveuwi Patented Apr. 19, 1927.

UNITED STATES PATENT OFFICE.

FREDERICK HYMANS, OF YONIKERS, NEW YORK, ASSIGNOR TO OTIS ELEVATOR COM- PANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

GOMPENSATING ROPE FOR I-IOISTING APPARATUS.

Application filed August 30, 1924. Serial No. 735,180.

This invention relates to hoisting appahoisting ropes. Therefore, to effect full ratus and more particularly to means for compensation for changes in weight of the 55 compensating "for the change in weight, due two portions of the hoisting ropes, the to the change in length, of the ropes between weight per unit length of the compensating a body and the drum from which it is susrope is made equal to the weight per unit pended. As the body is raised and lowered length of the hoisting ropes. the weight of the ropes between the hoisting Referring to Figure 1, the number of 60 mechanism and the body decreases and inhoisting ropes is shown as five. Hence, the

creases and to compensate for this change in combined weight of masses 6 and rope 5 10 weight, means are provided for subtracting is made equal per unit length to the weight and adding weight to the suspended body of the five hoisting ropes 2. By such conas it moves up and down. struction, the total Weight of the hoisting 65 The object or the invention is to provide ropes and the compensating rope is equally simple and economical compensation which divided at all times between the two sides will be noiseless in operation and durable. of the sheave, regardless of the position of A preferred embodiment of the invention the car.

as applied to an elevator system will be de- The masses 6 (see Figure 2) are prefer- 70 scribed in connection with the accompanyably of material having a high specific lng drawings, in which, gravity, as for example, lead or babbitt, and Figure 1 is a schematic view or" an elevator may be cast in position in spaced relation system embodying the invention. to one another to firmly grip the rope 5,

Figure 2 is a detail sectional view of a or the masses 6 may be pressed in place by 7 portion of the compensating means. pressure applied externally. For a given Figure 3 is a detail sectional view of a spacing, the length of contact with which portion of another embodiment of the comthe mass 6 engages the rope 5 will have a pensating means. definite efi'ect in reducing flexibility and in- Figure 1 is a fragmentary view taken at creasing local bending of the rope. In order right angles to Figure 1 and showing the that each mass may have its major axis hoisting ropes at their point of connection disposed longitudinally of the rope, as is so to the elevator car. preferable, while avoiding undue length of Referring to Figure 1, the hoisting mechcontact with the rope, each mass may have auism is shown as comprising a grooved a clearance recess 8 at one or both ends. sheave 1 over which passes a set of ropes 2. A determining factor in the length of con- On one side of sheave 1 is suspended an tact is the amount of surface which must be elevator car 3, while from the other side is in engagement to maintain the masses in suspended a counterweight 1. A colnpcntheir proper positions on the rope.

sating rope 5 having one end attached to the In Figure 3, the compensating rope is counterweightand its other end to the eleshown as comprising two

ropes

9 and 10, vator car, hangs freely suspended in the one a right lay and the other alett lay, and

i0 hatchwa-y. Masses 6 of suitable material are the masses 11 may in such cases embrace the secured to rope 5 at spaced intervals. As pair of ropes and be secured thereon in a the hoisting mechanism is operated to raise manner similar to that described'in connecthe elevator car 3, the portion of hoisting tion with Figure 2. This combination has ropes 2 between car 3 and sheave 1 decreases no tendency to spin.

45 in length while the portion of ropes 2 be- It has been found that compensating ropes tween counterweight i and sheave 1 inconstructed in accordance with this invencreases in length. At the same time the portion operate noiselessly, are easy to install tion of compensating rope 5 between its and have low cost of upkeep. The pressing lowest point 7 and car 3 increases in length or molding ot' the mass elements in place, while the portion between point 7 and counprovides for their firm contact or engageterweight l decreases in length, these ment with the contour of the rope, thus changes in length being equal to the making them secure. It is apparent that changes in length of the portions of the ther forms of roping, both as to the hoisting ropes and compensating rope, may be employed Without departing from the scope of this invention.

lVhat is claimed is Compensating means for hoisting apparatus ropes comprising a pair of ropes of right and left lay respectively, and a plu-v rality of mass elements embracing said pair of ropes and secured in spaced re filtlOD thereon. 10

FREDERICK HYMANS.