Power line support

• US 4,854,541 A
• Filed: 08/08/1988
• Issued: 08/08/1989
• Est. Priority Date: 08/08/1988
• Status: Expired due to Fees

• Current Assignee: Iowa State University Research Foundation Incorporated (Iowa State University)
• Original Assignee: Iowa State University Research Foundation Incorporated (Iowa State University)
• Inventors: McConnell, Kenneth G.
• Primary Examiner(s): CHIN SHUE, ALVIN C
• Application Number:
  US07/229,310
• Time in Patent Office: 365 Days
• Field of Search: 248/565, 248/636, 248/218.4, 248/610-613, 248/638, 248/562, 248/65, 248/58, 174/42, 174/45 R, 267/18, 267/195, 267/221, 267/226
• US Class Current: 248/565
• CPC Class Codes: H02G 7/14 Arrangements or devices for damping mechanical oscillations of lines, e.g. for reducing production of sound damping spacers H02G7/125

Abstract

The power line support of the present invention comprises a support tower having a lower end supported on the ground and having an upper end. A power line energy absorber is attached to the upper end of the support tower and comprises a housing attached to the support tower, a reciprocating piston within the housing and pneumatic damping chambers within the housing on opposite sides of the piston for yieldably resisting reciprocating movement of the piston within the housing. A cable is connected to the piston and extends over a pulley downwardly to the electrical insulator which connects to the power line where it supports the power line above the ground. Dynamic energy from the power line is transferred upwardly through the cable to the piston and is absorbed by virtue of the compression and expansion of the air within the chambers on opposite sides of the piston.

Claims

1. A support for a power line and adapted for use on a support tower having a lower end supported on the ground and an upper end, said support comprising:

an elongated cylindrical housing having mounting means thereon for mounting said housing to said upper end of said support tower;

said cylindrical housing having a partition therein separating said housing into first and second cylindrical compartments;

said partition having an opening therein providing communication between said first and second compartments;

said cylindrical housing having a first end wall provided with at least one air aperture therein for providing air communication from said first chamber to the exterior of said housing, said housing having a second end wall opposite from said first end wall and provided with an opening extending therethrough;

an elongated piston rod extending through said opening in said partition and having a first rod end within said first compartment and a second rod end within said second compartment;

a first piston on said first end of said rod and dividing said first compartment into first and second chambers;

a second piston on said second end of said rod and dividing said second compartment into third and fourth chambers;

said first chamber being between said first end wall and said first piston, said second and third chambers being on opposite sides of said partition, and said fourth chamber being between said second piston and said second end wall;

an elongated flexible member connected to said second piston and extending through said fourth chamber and through said opening in said second wall for supporting connection to said power line;

spring means within said fourth chamber yieldably holding said second piston in a predetermined axial position within said second compartment;

said opening in said partition being larger than said piston rod so as to provide limited air passage back and fourth between said second and third chambers during reciprocating movement of said piston rod and said first and second pistons within said housing.

2. A power line support according to claim 1, wherein said spring means comprises an elongated coil spring, spring stop means being provided within said fourth chamber, said spring means being in compression between said second piston and said spring stop means.

3. A support according to claim 1 wherein said cylindrical housing includes a baffle compartment on the opposite side of said first end wall from said first chamber, said baffle compartment containing at least one baffle therein and said housing having a baffle opening providing air communication from said air opening in said first end wall through said baffle compartment to the exterior of said housing.

4. A support according to claim 1 comprising a spring stop plate movably mounted within said fourth compartment for axial movement therein, said spring means being between said stop plate and said second piston;

adjustment means connected to said spring stop plate for holding said stop plate in plurality of preselected axial positions in said fourth chamber so as to adjust the amount of compression in said spring means.

5. A support according to claim 4 wherein said adjustment means comprise lead screw means threadably engaging said spring pIate means.

6. A support according to claim 5 wherein said housing includes at least one longitudinal slot therein providing communication from the exterior thereof to said fourth chamber, said spring stop plate including tab means extending through said slot to the exterior of said housing for longitudinal sliding movement within said slot.

7. A support according to claim 6 wherein said lead screw means threadably engaged said tab means.

8. A support according to claim 1 wherein said first, second, third, and fourth chambers contain air only and are free from other fluid.

9. A support according to claim 1 wherein said spring means yieldably urges said second piston toward said partition in opposition to any load placed upon said flexible member when said flexible member is supportingly attached to said power line.

10. A power line support according to claim 9 wherein said spring means comprises a non linear spring which applies a variable resisting force in response to the extent to which it is formed.