GB2218858A

GB2218858A - Device for erecting overhead cables

Info

Publication number: GB2218858A
Application number: GB8819000A
Authority: GB
Inventors: Erkki Koskelainen
Original assignee: SAHLINS MASKIN AB
Current assignee: SAHLINS MASKIN AB
Priority date: 1988-05-17
Filing date: 1988-08-10
Publication date: 1989-11-22
Anticipated expiration: 2008-08-10
Also published as: SE8801834L; SE8801834D0; FI891355A; GB8819000D0; SE466980B; FI891355A0; GB2218858B

Abstract

The device is mounted on an insulator (3, Fig 5) by grips 9, 10 and has rollers 5, 6 mounted on frames (23, 24, Fig 5) which pivot vertically on pins (7, 8). The pivotable frames allow the rollers to be swung into position and bring the cable between the rollers into contact with the insulation (Fig 5). The distance between the grips 9, 10 is adjustable 14, 15. <IMAGE>

Description

Arrangement for a cable trolley The present invention relates to an arrangement for a cable trolley, which exhibits attachment devices for the attachment of the cable trolley to an intended insulator or some other suitable object and a number of roller devices capable of interacting with a cable or other continuous device, for which purpose said roller devices are supported in such a way as to be free to move between positions adapted to cable-erawing and cable connection.

In cable trolleys of the kind referred to here, and in particular in cable trolleys of the kind which are intended for use in conjunction with the drawing and securing of a line, cable or similar continuous device, at an angle laterally in relation to insulators or other appropriate objects to which it is wished to arrange the cable, etc., in such a way that it is deflected, problems are encountered in conjunction with the ability to position the cable, etc., safely and effectively in the intended secured position after drawing of the cable, etc. Previously disclosed arrangements do not permit said problems to be resolved reliably without the risk of the cable trolley coming loose and falling, causing injury to persons and damage to property, resulting in costly delays to the cabledrawing operation.

The principal object of the present invention is thus, in the first place, to solve said problems by simple and efficient means.

Said object is achieved by means of an arrangement in accordance with the present invention, which is characterised essentially in that groups of roller devices are pivotally supported about a very'cay pivot shaft relative to the associated trolley frame and independently of the securing devices for the trolley, whereby lateral displacement of the cable, etc., supported by the cable trolley is permitted by swivelling each group of roller devices into position when the cable trolley is attached to the insulator, etc., in question.

The invention is described below as a preferred illustrative embodiment, in conjunction with which reference is made to the drawings, in which: Fig. 1 shows a cable trolley viewed from above, in a position ready for cable drawing, in a partially sectioned view; Fig. 2 shows a partial view of the cable trolley, viewed along the line Il-Il in Fig. 1; Fig. 3 shows a partial view of the cable trolLey, viewed along the line III - III in Fig. 1; Fig. 4 shows a partial view of the cable trolLey, viewed along the line I} - IV in Fig. 3; Fig. 5 illustrates the basic arrangement of the cable trolley in different positions; Fig. 6 shows the cable trolley in perspective, in a position ready for cable drawing, viewed at an angle from above; Fig. 7 shows the cable trolley in perspective and fully inverted;; Fig. 8 shows the cable trolley in perspective, in a position ready for cable connection, viewed at an angle from above; and Fig. 9 shows the cable trolley in a position ready for cable connection, viewed in perspective and fully inverted.

In accordance with the present invention an arrangement 1 for a cable trolley 2, which is designed to be attached temporarily to an electrical insulator 3 or some other appropriate object in order to facilitate the drawing and temporary support of a line, cable or other continuous device 4, in particular in conjunction with drawing at an angle V around the insulator 3, etc., consists of a number of roller devices 5, 6 with which the cable, etc., 4 can interact for the purpose of being carried and supported, and which are arranged in groups A, B situated at a mutual distance from one another viewed in the direction of drawing and are each pivotally supported about its own essentially vertical pivot shaft 7, 8 when the cable trolley 2 is secured in the drawing position I to an insulator, etc., 3.The respective groups A, B of roller devices are capable of being displaced between positions I, II adapted for cable drawing I and cable connection II, and the cable trolley 2 exhibits securing devices 9, 10, for example jaws equipped with protective means adapted to grip around and preferably to be accommodated in a matching annular groove 3A in an insulator, etc., 3.

The groups A, B of roller devices 5, 6 are pivotally supported relative to a trolley frame 11, 12 belonging to said cable trolley 2 independently of the securing devices 9, 10 for the trolley 2.

The groups of roller devices 5, 6 are preferably supported each by its own trolley frame 11, 12, which exhibits means 13 permitting the connection of at least two trolley frames 11, 12 to one another in order to form a cable trolley 2. Said connection means 13 can consist of a sleeve 14 and a rod 15 preferably exhibiting an end stop 15A, which sleeve and rod are capable of displacement relative to one another, and of a means 16 for locking same, the whole preferably being so arranged that one of the trolley frames 11 supports a fixed projecting rod 15, and so that a sleeve 14 or some other device around which a suitable grip can be found is permanently attached to the second trolley frame 12 and is capable of being slid onto and displaced along it, and is so arranged as to be capable of being locked in a desired locked position II by means of a locking nut 16 capable of being screwed onto the rod 15, so that it interacts with the rod 15 and the sleeve 14 and can be adjusted along the threaded element 17 of the rod by being caused to rotate using an appropriate spanner.

Each pivot shaft 7, 8 is appropriately situated on the opposite side of the securing device 9, 10 of the cable trolley, viewed in a direction away from the roller devices 5, 6 when these are in the cabledrawing position I.

Each pivot shaft 7, 8 can also be situated laterally displaced away from the roller devices 5, 6 in a direction 18, 19 towards said trolley securing device 9, 10, viewed in the longitudinal sense of the intended cable 4.

The lateral displacement of a cable, etc., 4 which is supported by the cable trolley 2, for example in order to permit the cable to be positioned in the desired attachment position II on an insulator, for example, so that the cable 4 can be attached directly and securely by tying or by means of special fittings capable of being connected to the insulator 3, preferably after the cable 4 has been deflected around the insulator, etc., 3 from its aforementioned drawing position I, is now made possible reliably simply by causing it to turn in the direction of the arrow 20, 21 and displacing each group of roller devices A and B capable of interacting with the cable 4 which it is carrying into the desired securing position II, when the cable trolley is secured through the effect of the securing devices 9, 10 to the insulator, etc., 3 in question.

Each of the groups A, B of roller devices is preferably capable of being locked in a detachable fashion by means of locking devices 22 at least in said cabledrawing position I, said locking devices 22 being prevented from being rotated unintentionally by being so arranged as to act between the holders 23, 24 for said group and the trolley frame 11, 12. The locking device 22 preferably consists of a locking pin 25, which exhibits varying width along its length, with openings 26, 27, 28 adapted to fit said locking pin 25 being present in said holder 23, 24.One opening consists of a groove 27 open at one end 27A, which at its other end 27B is connected to an opening 28 having greater width than the other openings 26, 27 and exhibiting a width such that it is so adapted as to accommodate a part of the locking pin 25 which exhibits a smaller width therein, but such that a further part of the locking pin 25, which is so arranged as to be capable of being accommodated, when in the locked position, in the adapted opening 28, and which is displaced along the locking pin 25, is so arranged as not to be capable of passing through the opening 27, but to be retained in the locked position. The locking device 25 can consist of a wheel threaded at one end, the outer part of which wheel is capable of being accommodated in a corresponding opening in the trolley frame 11, 12 after said outer part of the locking device has been introduced down into same by rotation of the locking device 25.

The roller devices 8 can also consist of rotatable rollers 5, 6, the width of which reduces n the direction of one of the ends, which are arranged in pairs at an angle X in relation to one another. The rollers 5, 6 are mounted on shafts 29 supported by said holders 23, 24, which on their upper side can exhibit a handle 30 to facilitate handling of the cable trolley 2 and its function.

In order to achieve secure retention of the cable 4 to the trolley 2, rotating locks 31 may appropriately be arranged next to the cable--accommodating space 32 of each holder. Each lock 31 can be pivotally mounted about a pulley axle 29 at one end 31A, and can be capable of being locked securely to a retaining leg 32 at its other end 31B by means of a similar locking device 33 to the locking device 22 described above, or by some other appropriate means.

The function of the invention should have emerged clearly from the foregoing, although it can be stated briefly that, for the purposes of cable-drawing, the cable trolley 2 is attached to the intended insulator 3 after pushing the two trolley frames 11, 12 together and tightening the nut 16. A cable, etc., 4 can then be accommodated in the space 32 between the angled rollers 5, 6 for the period during which the cable 4 is being drawn over the intended distance and up to said insulator 3. After the cable-drawing and cable-raising operations are complete, the locking device 22 is- released for each holder 23, 24 which it is wished to swing into the locked position II, as illustrated schematically in Fig. 5, in which position the cable 4 can approach and can be secured to the insulator, etc., 3. The nut 16 and the locks 31 are then slackened, so that the cable trolley 2 can be taken down freely from the insulator, etc., 3 after having been released from the cable, etc., 4.

The invention is not restricted to the illustrative embodiment described above and illustrated in the drawings, but may be modified within the scope of the Patent Claims without departing from the idea of invention.

Claims

Patent Claims

1. Arrangement for a cable trolley (2), which exhibits attachment devices (9, 10) for the attachment of the cable trolley (2) to an intended insulator (3) or some other suitable object and a number of roller devices (5, 6) capable of interacting with a cable (4) or other continuous device, for which purpose said roller devices (5, 6) are supported in such a way as to be free to move between positions (I, II) adapted to cable-drawing (I) and cable connection (II), c h a r a c t e r i z e d in that groups (A, B) of roller devices (5, 6) are pivotally mounted about a vertical pivot shaft (7, 8) relative to the associated trolley frame (11, 12) and independently of the securing devices (9, 10) for the trolley (2), whereby lateral displacement of the cable, etc., (4) supported by the cable trolley (2) is permitted by swivelling each group of roller devices (A, B) into position when the cable trolley (2) is attached to the insulator, etc., (3) in question.

2. Arrangement in accordance with Patent Claim 1, c h a ra c t e r i z e d in that a group (A, B) of roller devices (5, 6) is each supported by its own trolley frame (11, 12), which exhibits means (13) to permit connection of trolley frames one to another.

3. Arrangement in accordance with Patent Claim 2, c h a ra c t e r i z e d in that connection means are formed from a sleeve (14) and a rod (15) capable of displacement relative to one another and a locking device (16).

4. Arrangement in accordance with Patent Claim 3, c h a ra c t e r i z e d in that one trolley frame (11) supports a projecting fixed rod (15), onto which a sleeve (14) permanently attached to the other trolley frame (12) can be slid and along which it can be displaced, and which is so arranged as to be locked in a desired locked position by means of a locking nut (16) capable of being screwed onto the rod (15).

5. Arrangement in accordance with any of the preceding Patent Claims, c h a r a c t e r i z e d in that each pivot shaft (7, 8) is situated cn the opposite side of the securing device (9, 10) for the cable trolley, viewed in a direction away from the roller devices (5, 6), when these are in the cabledrawing position (I).

6. Arrangement in accordance with any of the preceding Patent Claims, c h a r a c t e r i z e d in that each pivot shaft (7, 8) is situated laterally displaced from the roller devices (5, 6).

7. Arrangement in accordance with any of the preceding Patent Claims, c h a r a c t e r i z e d in that each of the groups (A, B) of roller devices is detachably arranged so as to be capable of being Locked in said tinedrawing position (I) by means of locking devices (22) acting between the holders (23, 24) for said group and the trolley frame (11, 12) so as to be prevented from pivoting.

8. Arrangement in accordance with Patent Claim 7, c h a ra c t e r i z e d in that the locking device (22) consists of a locking pin (25) of varying width along its length and with openings (2628) adapted to fit said locking pin.

9. Arrangement in accordance with Patent Claim 8, c h a ra c t e r i z e d in that one opening consists of a groove (27) in the trolley frame (11, 12) having a width adapted to fit a part of the locking pin, but which exhibits a width less than a displaced part of the locking pin (25).

10. Arrangement in accordance with Patent Claim 9, c h a ra c t e r i z e d in that the locking device (25) consists of a wheel threaded at one end, the outer part of which wheel is capable of being accommodated in a corresponding opening in the trolley frame after said outer part of the locking device has been introduced down into same by rotation of the locking device.

11. Arrangement in accordance with any of the preceding Patent Claims, c h a r a c t e r i z e d in that the roller devices (5, 6) consist of rotatable rollers supported at an angle (X) in relation to one another, the width of which reduces in the direction of one of its ends.

12. Arrangement for a cable trolley constructed and adapted for use substantially as hereinbefore described with reference to, and as shown in, the accompanying drawings.