# US 11,079,013 B2 · Hydraulic apparatus for stretching conductors for power lines

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- Number: US 11,079,013 B2
- Document ID: US11079013B2
- Status: Granted
- Kind: B2
- Application number: 16/647,783
- Filed: 2018-09-20
- Published: 2020-07-23
- Granted: 2021-08-03
- Earliest claimed: 2017-09-25
- Assignees: Tesmec S.P.A.
- Applicants: Tesmec S.P.A.
- Inventors: Alberto Oscar; Roberto Pedrocchi
- Web page: https://patentgrep.com/patent/US11079013B2

## CPC

- F16H 61/431: Pump capacity control by electro-hydraulic control means, e.g. using solenoid valves
- F16H 61/47: for achieving a target output speed
- H02G 1/04: for mounting or stretching
- H02G 1/06: for laying cables, e.g. laying apparatus on vehicle
- E02F 9/2296: {Systems with a variable displacement pump}
- F15B 2211/20546: variable capacity
- F15B 2211/20553: with pilot circuit, e.g. for controlling a swash plate
- F15B 2211/20569: capable of working as pump and motor
- F16H 61/433: Pump capacity control by fluid pressure control means
- F16H: GEARING
- H02G: INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- E02F: DREDGING; SOIL-SHIFTING (winning peat E21C49/00)
- F15B: SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR

## Abstract

A hydraulic apparatus for stretching conductors for power lines comprising: a variable displacement hydraulic pump (10) that supplies by means of a hydraulic fluid a hydraulic motor (11) with a closed circuit connection; a displacement regulation system (15) of said hydraulic pump (10); a regulation system (20) of said hydraulic apparatus; characterised in that said regulation system (20) comprises: an inlet (21) that receives said hydraulic fluid that supplies said hydraulic motor (11); a first outlet (22) that supplies said displacement regulation system (15); a second discharge outlet (23); a flow limiter (30) connected to said inlet (21); a regulatable valve (31) connected to said flow limiter (30); a tap (36) connected between the outlet of said regulatable valve (31) and said first outlet (22); a measurement instrument (33) connected to the outlet of said regulatable valve (31), to measure the regulation pressure of said regulation system (20); a safety valve (34) connected to the outlet of said regulatable valve (31), the outlet of which is connected to said second discharge outlet (23).

## Claims

### Claim 1

A hydraulic apparatus for stretching conductors for power lines comprising: a variable displacement hydraulic pump (10) that supplies, by means of a hydraulic fluid, a hydraulic motor (11) with a closed circuit connection; a displacement regulation system (15) of said hydraulic pump (10); a regulation system (20) of said hydraulic apparatus; characterized in that said regulation system (20) comprises: an inlet (21) that receives said hydraulic fluid that supplies said hydraulic motor (11); a first outlet (22) that supplies said displacement regulation system (15); a second discharge outlet (23); a flow limiter (30) connected to said inlet (21); a regulatable valve (31) connected to said flow limiter (30); a tap (36) connected between the outlet of said regulatable valve (31) and said first outlet (22); a measurement instrument (33) connected to an outlet of said regulatable valve (31), to measure a regulation pressure of said regulation system (20); a safety valve (34) connected to the outlet of said regulatable valve (31), the outlet of which is connected to said second discharge outlet (23).

### Claim 2 (depends on 1)

The apparatus according to claim 1, characterized in that said regulatable valve (31) is a proportional valve.

### Claim 3 (depends on 1)

The apparatus according to claim 1, characterized in that said regulatable valve (31) is controlled remotely via a cable control or a radio control.

### Claim 4 (depends on 1)

The apparatus according to claim 1, characterized in that an external tank (35) is connected to said second discharge outlet (23).

### Claim 5 (depends on 1)

The apparatus according to claim 1, characterized in that said regulation system (20) comprises a single solid hydraulic block in which couplings for the inlet, first outlet and second discharge outlet are obtained and with the flow limiter, regulatable valve, tap, measurement instrument and safety valve required for operation mounted therein.

### Claim 6 (depends on 1)

The apparatus according to claim 1, characterized in that said regulation system (20) comprises a third outlet (32), connected to said outlet of said regulatable valve (31), to which said measurement instrument (33) is connected.

### Claim 7 (depends on 1)

The apparatus according to claim 1, characterized in that said hydraulic pump (10) is connected to said hydraulic motor (11) by means of a delivery pipe (12) and a return pipe (13).

### Claim 8

A hydraulic apparatus for stretching conductors for power lines comprising: a variable displacement hydraulic pump (10) that supplies, by means of a hydraulic fluid, a hydraulic motor (11) with a closed circuit connection; a displacement regulation system (15) of said hydraulic pump (10); a regulation system (20) of said hydraulic apparatus; characterized in that said regulation system (20) comprises: an inlet (21) that receives said hydraulic fluid that supplies said hydraulic motor (11); a first outlet (22) that supplies said displacement regulation system (15); a second discharge outlet (23); a flow limiter (30) connected to said inlet (21); a regulatable valve (31) connected to said flow limiter (30); a tap (36) connected between an outlet of said regulatable valve (31) and said first outlet (22); a measurement instrument (33) connected to the outlet of said regulatable valve (31), to measure a regulation pressure of said regulation system (20); a safety valve (34) connected to the outlet of said regulatable valve (31), the outlet of which is connected to said second discharge outlet (23);
wherein said regulation system (20) comprises a single solid hydraulic block.