US 2787884 A
Description (OCR text may contain errors)
April 9, 1957 c. o. BRUESTLE CABLE STRANDING MACHINE Filed May 22, 1953 lgg-L 2 Sheets-Sheet l April 5 c. o. BRUESTLE CABLE STRANDING MACHINE 2 Sheets-Sheet 2 Filed May 22, 1953 Carl; 0 Bruesfle 2,78 7,884 f atented Apr. 9, 1957 Fine CABLE STRANDING MACHINE Carl 0. Bruestle, Metuchen, N. J., assignor to Syncro Machine Company, Perth Amboy, N. J., a corporation of New Jersey Application May 22, 1953, Serial No. 356,859 14 Claims. (Cl. 57-65) This invention comprises improvements explained below in detail for improving the construction and operation of cable stranding machines. 7
These machines are well known in the art and are of the type for the purpose of this invention in which there is provided a main rotatable shaft upon which are mounted a plurality of cradles which are bodily rotated by the main shaft and which are supported thereon so as to in turn rotate on their own axes. In other words, this invention is concerned with a planetary type of cable stranding machine. Each cradle is provided with rotatable pintles or stub shafts upon which the cable spools are mounted for rotation on axes at right angles to the axes of rotation of the cradles.
As is Well understood in this art, these machines are frequently of massive construction and by reason of the weight of the structure and of the loaded cable spools the forces encountered in operation are very large, thereby placing a rather low limit upon the practical speed of rotation of the main shaft.
Likewise the cradle frames, due to the reversal of forces encountered are at one moment subjected at one side to a maximum stress and shortly thereafter to a mini-mum stress. This requires that the side members of the cradles be relatively heavy in order to withstand the maximum forces that are encountered. As will be appreciated when a particular side frame member of the cradle is subjected to a maximum force, the other side member of that cradle is subjected to a minimum force, necessitating that each side member be strong enough to absorb these forces.
A prime purpose of this invention is to provide a novel construction wherein the side frame members of each cradle are cross-connected or tied together so that the force applied to any one side member of a pair is distributed into the other side member, making it possible to lighten their construction without danger of breakage.
In accomplishing this object the construction used is such as to provide added insurance against the possibility of the cable spools escaping from the cradles while the machine is in operation. This arises from the fact that in accordance with this invention a tie rod is used to cross-connect the side frame members of the cradles, and is positioned so as to pass through the tubular core of the spools. The result is that the cable spools cannot escape from the cradles unless the tie rod breaks or unscrews.
The particular construction herein disclosed is characterized by the fact that the tie rod directly crossconnects the side frame members of the cradle and is structurally independent of the bearing assemblies which rotatably support the spool pintles.
Other and more detailed objects of the invention will be apparent from the following description of the embodiment thereof illustrated in the attached drawings.
In the accompanying drawings,
Figure 1 is an elevational view of sufficient of a planetary cable stranding machine to illustrate this invention, showing a spool cradle in plan;
Figure 2 is a similar view showing the spool cradle in side elevation; and
Figure 3 is a cross-sectional view taken on the line 3-3 of Figure 1.
The machine includes the usual rotor shaft 10 which is provided with webs or spiders 11 and 12 upon which is rotatably mounted in the bearings 14 and 15, the reel cradle 13. The cradle includes a pair of side frame members 19 and 28 which have a pair of aligned bearing housings 17 and 18. Each of the housings has a cylindrical opening and in the housing 17 is a bearing assembly comprising a pair of outer races 21 and a pair of inner bearing races 22. The outer races are mounted in the housing 17 while the inner races are mounted upon a flanged sleeve 23 which is threaded at the opposite end and provided with a locking ring 24 by means of which the bearing parts are held assembled. The tapered roller sets 25, 26 are mounted in the usual cage, as illustrated. Thus each bearing assembly comprises a pair of opposed tapered roller bearings. Mounted on the flanged end of the sleeve 23 by means of screws, is a truncated conical disc 27 which forms one seat for the core of a cable reel 16.
Secured to the seat member 27 by means of screws is a grooved pulley 23 which forms part of the usual friction brake commonly used in these machines. This wheel is provided with a projecting screw 29 positioned to engage in an aperture in the adjacent head of the spool 16. A ring 50 is attached by screws to the housing 17 and cooperates with a sealing ring 51 which in turn cooperates with a flanged rim on the pulley 28 to seal the bearing assembly at that point.
The other bearing assembly is mounted in the housing 18. It comprises an externally threaded sleeve 31 that cooperates with threads in the housing to permit its longitudinal adjustment by rotation. These threads are indicated at 32 and are preferably of a relatively course pitch to facilitate rapid adjustment. Mounted in the threaded sleeve 31 on suitable seats are tapered roller assemblies comprising the outer roller races 33 and the inner roller races 34. The tapered bearings 35 and 3-6, as before, are mounted in suitable cages. The inner bearing races 34 are mounted upon a sleeve 48, to the inner end of which is attached, by means of screws, a truncated conical nose piece 37 for cooperation with the other end of the spool 16. The bearings are held on the sleeve 48 by means of a threaded ring 38. Closing the outer end of the threaded sleeve 31 is a cap 39 which is secured to the sleeve by means of machine screws as shown. The cap 39 has a central passage with a recess at one end in which the head 42 of a threaded bolt 4-0 may seat. The end of this bolt is threaded at 41 for threaded cooperation with a cap 30 closing the outer end of the passage in the housing 17 and mounted thereon by means of machine screws, as shown. The parts 39 and 42 are provided with spanner wrench openings, as shown.
The threaded sleeve 31 can be locked in adjusted position by means of a clamp which consists of a pair of threaded blocks 43 lying in a cavity formed in the frame member 20. These blocks are drawn into gripping relation with the sleeve 31 by reason of the fact that they have reversely threaded passages which are engaged by reversely threaded portions of a clamping bolt 44.
In order to replace a spool in a cradle embodying this mechanism the clamping blocks 43 are released, bolt 40 is removed and the sleeve 31 is rotated to draw the rotatable pintle and bearing assembly away from the end of the spool so that it can be withdrawn and a new one put in its place. The sleeve is then turned in the opposite direction to seat the conical nose piece 37 in one end the nose pieces 27 and 37 and the sleeve 37- is screwedup. It will be further apparent that when the tie rod 40 is put in place and screwed up there will be an additional 'loading on the bearings. Each of these loadings will depend upon how tight the operator screws up the sleeve 31 and the tie rod 40. Finally when the machineis in operation there will. be a third loading added to the bearings due to the centrifugal forces caused by the loaded spool. At. one extreme position this thirdloading clue to thespool will be to the left, for example in Figure 3, and at the otherextreme position it will be at the right. These reversals in the direction of loading will be gradual as the cradle revolves, as those skilled in the art will appreciate.
When the loading due to centrifugal force is to the left it will be seen that the righthand bearing of the lefthancl assembly and the righthand bearing of the righthand assembly will take the load, and when the centrifugal force is acting to the right the lefthand bearing of each set will take the loading. As previously suggested in each case,v and ofv course for all intermediate positions the loading due to centrifugal forces will be divided equally between the side frame members by reason of the presence of the tension of tie bar 40 which'connects them together.
it will be seen that the bearing assemblies are physically independent of the tie bolt 4%. With the development of centrifugal forces due to the rotation of the cradle any loading due thereto which is placed on the bearings is divided between them for either axial direction of this loading by use of the pair of opposed tapered bearings. Any forces which are transmitted through the bearings into the housings 17 or 18 are divided between the side frame members by reason of the connection provided by the bolt 40.
It is apparent that the nose pieces can be adjusted so that there is no chance of any side slap or looseness at the nose pieces in relation to the spool. It will also be apparent that the spool may not escape from the cradle at least until the bolt 40 is broken or works free, providing a further safety factor.
There are other advantages of this construction but the outstanding feature thereof is the tying of the two side frame members directly together. so that each may bear its share of the load as the other is subjected to centrifugal forces. This arrangement permits of either a lighter cradle construction for a given speed or a higher speed of machine operation for a given side frame memher strength.
The particular form of construction herein used to illustrate the principles of this invention can be varied by those skilled in the art. I do not, therefore, desire to be limited to the single embodiment selected for illustrative purposes but rather prefer to be limited only as-required by the scope of the claims granted me.
What is claimed is:
1. In a cable stranding machine, a rotatable spool cradle having a pair of side members, a pair of rotatable spool supporting pintle assemblies independently mounted in said side members respectively, and a tension bar interconnecting said side members independently of said pintle assemblies.
2. In the combination of claim' 1, said assemblies including a pair of tubular pintles, said tension bar extending through said tubular pintles.
3. In the combination of claim 1, said assemblies in-.
4. eluding a pair of tubular pintles, said tension bar extending through said tubular pintles, and cap members bearing directly on said side members against which said tension bar bears.
4. In the combination of claim 1, said pintle assemblies including a pair of aligned tubular pintles, a sleeve threaded ly mounted in one of said side members, antifriction bearings interp'osed'between' one of said tubular pintles and said sleeve, and a pair of cap members, one mounted onsaid sleeve and the other onthe opposed side member; said tension bar" engaging said cap members.
5. In the combination of claim 1, one of said pintle assemblies including.asleeve'threadedly mounted on one of said side members, and means for locking said sleeve.
6. In the combinatiorrofclaim 1, saidpintle assemblies including a pair of opposed spool supporting conical nose pieces.
7. Inthe combination of claim l, said pintle assemblies each including a pair of taperedantirfriction bearings.
8. In the combination ofclaim. 1, said pintle assemblies each including a-pair'oftapered anti-friction. roller bearingsv arranged in opposed balanced relation.
9. In the combinationof claim 1, means-for securing one of saidpin-tle assembliesv directly in the associated.
side members, and means for supporting the other of said pintle assemblies for axial adjustment. in the other of said sidemembers.
10. Inthe combination of claim 1, said assemblies each including a pair of opposed anti-friction thrust bearings.
11. In a cable stranding. machine, a rotatable spool cradle having a pair of side members, a pair of aligned spool pintles, bearing assemblies for rotatably supporting said pint'les in said side members, and a tension bar lying axially of saidpintles and directly interconnecting said side membersindependently of' said pintles.
12. A combination of described, comprising cradle structure for rotation on an axis, a pair of rotatable pintles aligned on anaxis of rotation at right angles to said cradle axis, av pair of bearing-assemblies mounted on said frame members for rotatably supporting said pintles, and a tie bar lying on said. pintle axis and rigidly crossconnecting said cradlexadjacent and'independently of said bearing assemblies. v
13. A combination as-de'scribed, comprising a cradle for rotation on. an axis, aapair of rotatablepintles aligned on. an. axis of rotationnatright angles to said cradle axis, a pair of bearing assemblies for said pintles, one assembly and pintlebeing axially fixed on said cradle and the other assembly and pintle being. axially adjustable on said cradle, means for. locking the adjustable assembly and pintle in adjusted'position, and a tie bar lying on the pintle'axis connected at'its ends directly to the cradle.
'14. In the combination of claim 1, one of said assemblies being fixed: tothe associated side member of said cradle andthe other being axially adjustable on its associated side membenand means for locking the latter 7 assembly against axial movement.
References-Cited in the file-of this patent UNITED STATES PATENTS Nystrom et a1 Jan. 10, 1950