in a rclatively few large pieces, thus reducing  the assem- bly or application  time  to  a minimum。  In  this manner, the Le Bus counterbalanced spooling grooves may be quickly and i=cexpensively provided on substantially any drum core。

It is an impcrrtant object of this invention to f GVide a novel method of providing counterbalanced spending grooves on a drum  core。

It is another object of this invention  to  provide a meihoct of: providing counterbalanced spooling  grooves on a drum core throup•h the utilization of conventional machining  processes。

3,1 10,080

Another object of this invention  is to provide  a method ct grooving a drum core with a continuous  circumfer- ential groove havin;; combined helical and parallel por- tions  in  a manner  requiring  a  minimum  of exp•<nse。

5ti11 another object of this invention is to provide a method of grooving a drum core with a continuous cir- cumferential gi oove having combined helical and parallel portions in  a  manner  wh»•rein  II:e  same  method  may be utilized for providing a variety of the helical and par- allel patter:is  on the  drum。

Still 。another obJect of this invention is to provide  a novel method of providing a counterbalanced grooving on the periphery of the spooling drum  and  which is simple and efficient in operation。

Other and further objects and advantageous features of the prcs-•nt invention  will  hereinafter  more  fully appear in connection with a detailed description  of  the di awings in  v/hich:

FIGURE 1 is a perspective view of a parallel grooved sleeve embodying the invention。

FIGURE 2 is an exploded perspective view of a grocv»•d sleeve as shown in FiGURE 1, and depicting one modi- fication thereof for providing  a  counterbalanced  grocv- mp on a drum core。

FIGURE 3 is a view  similar  to  FIGURE  2 depicting the segm•。nts of the grooved sle•ve as re-arranged for attachment  to a drum core。

FIGURE 4 is an evolved plan view ct a  cylindrical sleeve emt›odying that in'/ention。

FIGURE 5 is an evolved plan vi<•w of a cable spooling drum having a coimterbal:inced grocvin;; thereon as assembled from the embodiment depicted in FIG'dT'。fl 4。 FIGURE  6 is a sectional  view  ta1:en  on line  It—6  of

FIGURE 5。

FIGURE 7 is a sectional vi。•w tai:en on 11ne 7—7 of FIGURE  5。

FIGUPsE 8  is  a  view  similar  to  FIGURE  4 depicting a  modified  arrangement  fcr thc  grooved s1ee•ze。

rIGURE 9  is  a  view  similar  to  FIGURE  5  depicting a spooling drum  as  assembled  from tire s1c»•ve depicted in  FIGURE  s。

FIGURE  10 is  a sectional view  ta1‹en  on line   18—18

of FIGURE 9。

FIGURE  11 is  a  sectionsl  view  tai:en  on line 11—11

of FIGURE 9。

FIGURE 12 is a view s:iini1ar to  FIGURE  4 depicting st111 another  modified  arrangement for “tne grooved sle•-ve。

FiGURH 13 is  a view  siriiilar  to FIGURE  5 depicting a spoo1ir。g drum as assembled from the s1e••ve depicted in FIGURE  11。

FIGURE 14 is a  sectional  view  tai:en  on  line 14—14 of  FIGURE 13。

FIGURE  15 is a sectional view taken en line 15—is  o:I

FIGURE 13。