This invention relates to improvements in cable  spool- 10 ing apparatus and more particularly, but not by way of: limitation, to a  method  of  providing  a  continuous com- bined  parallel  and  helical  circumfercntial  groove around the outer periphery  of  a cable spooling drum。84387

Tn the spooling of multiple layers of  cable or line  onto a drum core, it is important to control the winding of the initial layers to provide a true  and  even winding  thereof in order to maintain any control whatsoever over the outer winds  or layers  of  the  cables。   Many  systems have been imtroduced to improve the winfiing of the  initial  layers 20 onto tire drum cores, particularly in cable  spooling op- erations re‹¡uiring many layers of the cable to be  o-zerlaiil

on the drum。 For example, the drum core is  often pro- vided with a continuous spiral or helical  groove extend- ing b•tiveen the drum flanges for recei•zing the initial layer of tbe cable。 This type of grooving has many disad- vantages, however, in that the second layer, and succecd- ing layers of the cable must wrap around the drum in an opposite  longitudinal  direction  from  the  first  wind,  and

considerable  cbafing  of  the  cable,  and  irregular  spacing 30

between  the  wraps  of  the  layer  frequently occur。

A counterbalanced cable spoolin;; system for  providing a true and efficient winding of multiple layers of cable  on a drum core has b•-en d•+ve1oped by rrank1in L。 Le Bus, Sr。, as disclosed in various L• Bus Prior  art patents,  such as United States Letters Patent No。 2,620,996, issued December 9, 1952, entitled “Cable Winding Apparatus”; No。  2,708,080,  issued May  10, 1955, and entitled “Hoist-

ing Drum”; No。 2,732,150, issued January 24, 1956, and entitled “Balanced Cable Spooling”; and No。 2,734,695, 40 issued Fe1›ruary 14, 1956, and entitled “Balanced Cable Spooling。” The spooling system developed by the afore- mentioned patents has substantially eliminated the disad- vantages of prior grooving systems。 Consequently, the counterbalanced spooling has greatly advanced the cable spooling art and has met with wide acceptance in hoisting industry of all typ••s。

The Le Bus counterbalanced spooling system utilizes  a drum core grooving desig• comprising a continuous cir- cumferential groo•/e having alternate helical portions and 50 straight  or parallel  portions  to  achieve  the optimum con-

trol of the cable  spooling  operation。  This combined helical and parallel grooving on the drum core is now usually accomplished  in one of several methods。   In some

dies are needed  for rolling the grooved  bar  in accordance

with Vartous cable or line  diameters。

Another method of obtaining the counterbalanced groovin。g on a drum or wincii is to provide a parallel grooved sleeve with blanked out or  non-grooved  cross- OVer areas or sections, or to fill the cross-over area with groove‹l bars。 Tire system of blanked out cross-over areas has been used  on  large  drum  cores。  However,  one  of the disadvantages of: this system is a tendency to crash the cable or wire rope in the blanked out cross-over section during the winding of multiple layers of the cable on the druiii。 In the case or filling the  blanked  out cross-over areas with grooved bars, ot course, the bars or segments must be fitted into the blanked out sections and welded therein。 This is time consuming, and the welding opera- tion is not entirely desirable, as hereinbefore  set   forth。