Cable suspension device
The present invention relates to problems how to keep cable arrangement functional, or at least make the damage as little as possible, after being exposed to different types of mechanical overloads. The problems are solved by methods and arrangements in which the securing means and the contact material of the securing means are arranged so that the cable can slide through the securing means when it is exposed to mechanical overloads.
1. A cable suspension device, comprising:
at least one cable securing device, the cable securing device comprising:
a first part and a second part that secures a cable between the first part and the second part when brought together into a closed state, and
an adjustable spring-biased fastener that holds the first part and the second part of the cable securing device together in the closed state;
a respective contact surface, attached to each of the first part and the second part, wherein:
the contact surfaces comprise an elastically adaptable contact material having built-in cavities which are adapted so as to enable the contact surfaces to elastically adapt to a shape of the secured cable, and
the adjustable spring-biased fastener is adapted so as to include an adjustment range that enables the first and second parts to be secured together with enough pressure to prevent slippage of the secured cable under normal loads and enables the secured cable to slide though the cable securing device only when the secured cable is exposed to a mechanical overload.
2. A device according to claim 1 where the cable suspension device further includes a fastener comprising a hole suitable for hanging the cable suspension device on a hook.
3. A device according to claim 1 where the contact material comprises polymeric material.
4. A device according to claim 1 where the contact material of the cable securing device has a elasticity module between 40 and 500 MPA.
5. A device according to claim 1 where the contact material is configured so that the coefficient of friction between the contact material of the cable securing device and a secured cable is between 0.2 and 0.4.
6. A device according to claim 1 , where the first and the second part of the cable securing device are pivotally connected to each other.
7. A device according to claim 6 where the first and the second part of the cable securing device is be pivotally connected in at least two different positions for making it possible to adapt the securing device to different physics of a secured cable.
8. A device according to claim 6 , where the first and second part of the cable securing device are held together by at least one securing screw bolt.
9. A device according to claim 1 where the adjustable spring-biased fastener of the cable securing device comprises at least one spring suitable for applying a cable securing force on the first and second part of the cable securing device.
10. A device according to claim 9 , wherein the at least one spring is helical.
11. A device according to claim 10 where said at least one spring is mounted around a securing screw bolt.
12. A device according to claim 1 comprising two cable securing devices of which at least one is pivotably mounted on the cable suspension device.
13. A device according to claim 12 where both of the cable securing devices are pivotably mounted to the cable suspension device.
14. A device according to claim 12 , wherein at least one of the cable securing devices is mounted to the cable suspension device to be slidingly movable.
15. A device according to claim 14 where both of the cable securing devices are connected to the cable suspension device to be slidingly movable.
16. A device according to claim 1 where the cable suspension device further comprises a rotatable cable supporting means which enables a cable resting thereon to be drawn forwards in said suspension device.
17. A device according to claim 16 where the rotatable cable supporting means is movable for making it possible to detach it from a cable resting thereon.
18. A method for securing a cable to a pole, the method comprising:
attaching a cable suspension device to an attachment point using a cable suspension device fastener, wherein the cable suspension device includes a cable securing device that includes:
a first part and a second part that secures the cable between the first part and the second part when the first part and the second part are brought together into a closed state,
an adjustable spring-biased fastener that holds the first part and the second part of the cable securing device together in the closed state; and
a respective contact surface, attached to each of the first part and the second part, wherein the contact surfaces include an elastically adaptable material having built-in cavities;
securing the cable into the cable securing device, wherein the cable is secured into the cable securing device by bringing the first part and the second part of the cable securing device together into the closed state;
adapting a shape of the contact surfaces to the cable by means of the elastically adaptable material having built-in cavities; and
applying a pressure with the adjustable spring-biased fastener to secure the cable to prevent slippage of the secured cable under normal loads and enables the secured cable to slide through the cable securing device only when the secured cable is exposed to a mechanical overload.
19. A method according to claim 18 wherein the attaching step includes hanging the cable suspension device on a hook that penetrates a hole in the cable suspension device.
20. A method according to claim 18 comprising the step of: configuring the properties of the contact material of the cable securing device so that it has a elasticity module between 40 and 500 MPA.
21. A method according to claim 18 comprising the step of: configuring the properties of the contact material of the cable securing device so that the coefficient of friction between the contact material of the cable securing device and the secured cable is between 0.2 and 0.4.
22. A method according to claim 18 comprising the step of: securing a cable into a cable suspension device by securing it in two cable securing devices; and mounting at least one of the cable securing devices pivotably.
23. A method according to claim 22 comprising the step of: mounting the two cable securing devices of the cable suspension device pivotably.
24. A method according to claim 23 comprising the step of: mounting at least one of the cable securing devices of the cable suspension device to be slidingly movable.
25. A method according to claim 24 comprising the step of mounting the two cable securing devices of the cable suspension device to be slidingly movable.
26. The cable suspension device according to claim 1 , wherein the coefficient of friction between contact surface and the secured cable is between 0.1-0.6.
27. The method according to claim 18 , wherein the coefficient of friction between the contact surface and the secured cable is between 0.1-0.6.