US 1973446 A
Description (OCR text may contain errors)
B. A. E. RosENQu'lsT 1,973,446-
(mami: GUIDING DEVICE I Sept. 1l, 1934.
FiledJax'z. 23,- 1934 2 Sheets-Sheet 2 I lmeno." i
Patented Sept.Y 1l, 1934 UNITED STA 1,978,446 CABLE comme nsvrs nm- A. a. moet, nume, n. Application January 2.3, 1934, Serial No.' 707,0 4 claim. (cnn-15s) v 'I'his invention relates to a cable guiding device for hoisting drums, and particularly to those suchas are commonly used on electric overhead cranes, although not limited thereto.
In the use of electric overhead cranes, one or more power driven cylindrical drums are employed to wind a cable, or cables, which are usually of steel, upon their outer surfaces in order to obtain the required hoisting effect.' Ordinarily, the surface of the drum,l or drums, isA grooved so that the hoisting cables will wrap themselves thereon in a helical course. Under most circumstances a side-pull occurs as the object being lifted is'not directly beneath the point of tangency of the cable on the drum, `and the cable will therefore become taut at an angle with respect to the vertical. If the line of side-pull is normal to the axis of the drum, no diiiiculty occurs. However, if the side-pull is parallel tu the axis of the drum or has a parallel resultant, there is a tendency for the cable to leave the proper groove and wrap itself irregularly upon the drum. V
It also frequently happens that slack occurs in the cable when the load is released, and it springs out of the proper groove into an incorrect position either to the 'right or left. Such occur- -rences sometimes cause the cable to be wrapped in ,two or more layers at one position so that, due to the thickness of the mass, it binds against adjacent crane parts, and the rope is damaged.
It is not unusual that such overlaps of the cable are impossible to'unwind without' great diiiiculty and the operation of the crane is tem-1 porarily interrupted.
One object of thepresent invention is to provide a novel-.cable guiding device for hoisting drums which will function to guide the cableinto or out of the active groove of the drum at a true tangent with respect to the axis thereof. -That is to say, the cable will be fed into or out of the groove Whichis receiving, or paying-a, at a ninety degree 'angle with respect tothe axis of the drum, 'allowance being made, of course, for the variance resulting fromv the. helix of the groove.
Another object is to provide a novel apparatus of the class described which will properly direct the cable into and out of the active" groove and wi1l,. in addition, resiliently maintain the same therein at a position adjasentits tangent.
Still another object is to provide an apparatus of the class describedl which can be cheaplyand easily installed on existing crane equipment, and one which will be entirely automatic in operation and require little if any attention.
These and further objects of the invention will bev apparent after referring to the drawings, in which:
Figure 1 is aplanshowing part of the apparatus of the invention.
Figure 2 isl an elevation disclosing the entire apparatus inV operation.
Figure 3 is a sectional end view on the line III-III of Figure 2.
Figure 4 is a sectional view on theline IV--IV of Figure 3.
Figure 5 is a sectionalview on the line V--V- o: Figure 4.
.Referring more particularly to the drawings, the letter A designates a crane trolley which carries a shaft B 'on which there is mounted a hoisting drum C driven through a large gear .D which-is likewise secured to the shaft B.
The drum C has attached thereto a cablev F having on its other end a grab bucket G for scooping quantities oi' piled material. As long as the cable F is directly beneath the point of `tangcncy of the cable on the drum, the eiliciency of the hoisting drum is unimpaired. However, when the cable F occupies the position Figure .2, 'the difficulties previously recited are experienced.
According to the teaching of the present invention, the hoisting drum C, having the usual helical grooves 2, is( provided `with la frame comprising a-plurality of segments, asat 4, 5 and 6 and which, when taken togethcncompletely encircle the periphery of the drum. One end of the segment 4 is provided with a flange '7, as is one end of the segment 6 provided with, ailange 8, while both ends of the segment 5 are flanged, as at 9. The adjoining ends of the segments 4 and 6 are united in a hinge-joint 10, which is in the form of a hubprovided with a central apergture 12. A hub 14 is integrally united to the segment 5 and provided with a central aperture 15. A pair of shafts'l and 17 are suitably connected to the crane trolley A in close proximity to the shaft B and on opposite sides thereof, in such manner as to extend through the hubs 10 and 14, respectively.
A plurality of shoes 18 are each provided with a series of ribs lil-conforming substantially to.
the contour of the helical grooves 2 onv the shown in dotted lines and indicated at X iny drum C, and "two of the same carry a flange 20 extending-at right angles with respect to the axis of the ribs 19. One of the shoes 18 is disposed with its vilange 20 between the Bange l of4 the segment 4 and one ofthe ilanges 9 of, the shoesl'a,- while the other of the shoes 18 is disposed with its flange 20 between the -ilange 8 of the segment 6 and the4 other flange 9 of the segment 5. The ilanges`20 ofthe shoes 18 lare held between 'the flanges oi' the various segments by means of bolts 21 and nuts 22, and
permits their ribsl 19 extending into the grooves 2 of the hoisting drum C.v
The hinge-joint 1 0, formed by segments land 6p provides a recess 24 for receiving a flange 25"v on another of the shoes '18 and which extends in the same directionas the axis of -the ribs "19. This shoe is suitably supported by having its flange 25 apertured at 26 in such manner as to posed of a split and renewable hard-bronze ca sting vwhich is so positioned as to have its aperture receive a tangent of the hoisting drum C.'
-allowance being made, of course, for the slight variance resulting from the helical grooving of the drum. f
A pair of flanges 34 are integrally formed with the segment 4 and madev to extend in a direction parallel to the axis of the drum. A pair of ears are likewise integrally formed with the segment 4 and provided with a pivot pin 36 to which one end of a' shaft 37 is connected and made to occupy a position between the flanges 34. The othery end of the shaft 37 is rounded,
as at 38,' and provided with a threaded extremity 39. A grooved pulley 40 is journaled on the rounded portion 38 of the s ha'ft 37 and maintained in position by means of a nut 41' and f' stood that Ido not wish to be limited-exactly washer 42. i The segment 4 has an aperture 43, and a sim- ."ilar aperture 44 is provided in the shaft 37- and in alinement therewith. A headed bolt 45 is made to extend through the aperture 43 in the segment 4 andthe aperture 44 in the shaft 37, and -provided with a threaded end 46. A
,spring 48 is positioned over -the threaded end 4.6
of the bolt 45 and between washers 47, a nut 49 being provided for'establishing a resilient and `adjustable iniiuence on the shaft 37 on which the grooved pulley 40 is mounted.
In installation, the segments 4, 5 and 6 carrying the shoes "18 are assembled with the ribs of. the latter occupying a number ofthe helical grooves 2 in the drum C. The cable F on the drum is threaded under fthe' pulley 40 and Athrough theaperturefof theguiding bell 30.
the winding operation is commenced', the cable will travel through the bell 30 and onto the helical grooves 2 of thedruxn at an exact tangent, and will be made to stay in said groove by means of the grooved pu11ey'40 which is resiliently maintained in contact therwithbymeans of the adjusting nut 49 through 'the tension spring48. It will thus be seen that due tothe positioning of the ribs19, of the shoes 1 8, in
the grooves 2 vof the drum, the. frame composed.-I
of the segments 4, 5 and 6-will be made to travel on the shafts 16 and 417 along the axis of the andiin such manner as to position the guiding'bellp 'and the groove pulley 40 in Aworking relationship with respect to the activef groove ofthe drum, or that which is either paying oi" or "receiving" the cable',. and 'thus obviate all' of the difficulties previously referred td@ ,1 While I have shown' and described one specic embodiment of my invention, it will be underlaxis substantially parallel to the axis' of said with said cable.
'ing the cable into the active groove in said drum.
substantially parallel to the axis ofsaid drum, a
in said groove as it is-being fed or said 'guiding thereto, since various modications may. be'made without departing from the .scope of my invention, as defined in the following claims.
l. A cable guiding device for hoisting drums' comprising a slidable frame adapted to encircle at least a substantial portion of the circumference of said drum, vatleast one shoe connected to said frame and adapted to seat in at least' one of the grooves in'said drum, means for guiding the cable into the 'active groove in said drum, a shaft pivoted to, said' frame with its'.
drum; a pulley on'said shaft, and resilient means for influencing said shaft in such manner asto cause said pulley to be positioned closely adjacent said active groove and to make contact 2. A cable device for hoisting drums comprising aslidable frame adapted to encircle atleast a substantial portion of the circumferf ence o f said drum, at least one shoe connected to said frame and adapted to vseat in at least one of the grooves in said drum, meansfor guida shaft pivoted to said frame with its axis substantially parallel tothe axis oit said drinn, a
pulley on saidshaft, resilient means for influencing said shaft in such manner as to cause said pulley to be positioned closely adjacent said .active groove and to make contact' with said at least a substantial portion of the circumference of said drum, at least one shoe connected :to said frame and adapted to seat in at least one of the grooves in said drum,4 means for guiding the cable into the activel groove in said drum,` a shaftpivoted to said frame with its axis pulley on said shaft. and resilient means for in fiuencing said shaft: in such manner as to cause said pulley to be positioned closely adjacent saidl active groove and to make contact with said cable, said guiding-means including a bell having an aperture alined with a tangent of; said drum. i
4.. A cable` guiding device for hoisting drums comprising a slidable frame adapted for movement along the axis of said drum, at least one 1 3 shoe connected 'to said frame and adapted vto seat in at least one of the grooves in said drum,
.an extension on' said frame, a clamp forsaid 'extension, a guiding bell disposed-between said extension and said clamp and having an aperture, alined with a tangent ofthe active groove of said hoisting drum, in combination with a shaft pivoted to said frame with its axis substantially`-A parallel to the axis ofsaid drum, apulley on said shaft, a bolt :extending through said frame and said shaft, a spring on said bolt, and an adjusting nut. for resiliently .influencing #said pulley against the active groove of said hoisting drum in such manner as to maintain the cable into and out 4 Baca A. E. aosnNQUrsr.