Submarine cable-burying devices

Claim 2

A plow-type cable-burying device comprising a tubular body consisting of a cable inlet portion extending in a direction in parallel with the ground under water, an intermediate bent portion gradually bent downward, and a cable outlet portion opened at the bottom of a trench being dug by the device, sledges attached to said tubular body one on each side of its center line, said sledges being adapted to remain in contact with the ground under water in spite of variations in the ground contour and to stabilize the attitude of said tubular body, a metal fitting secured to the front end of said tubular body and adapted to attach at least one towing wire for dragging said tubular body thereto, at least one vertically mounted cultivating blade attached to said tubular body, and a vertically mounted plow-type digging blade secured to said intermediate bent portion of said tubular body and provided in the front end thereof with a sharp knife edge and having side surfaces gradually diverging towards the rear portion thereof, and a plurality of cable guide cylinders each having at least one wire guide secured thereto and through which is extended said towing wire, said cable guide cylinders being supported by said towing wire.

Claim 3

A plow-type cable-burying device as claimed in claim 1 and further comprising a protective blade attached to said tubular body and extending along the lower side of its center line and adapted to be brought into contact with the ground under water prior to said cultivating blades and digging blade, thereby preventing said cultivating blades and digging blade from biting into the rock bed.

Claim 4

A plow-type cable-burying device comprising a tubular body through which is passed a cable to be buried in the ground under water, sledges attached to said tubular body one on each side of its center line, said sledges being adapted to remain in contact with the ground under water in spite of variations in the ground contour and to stabilize the attitude of said tubular body, a metal fitting secured to the front end of said tubular body and adapted to attach at least one towing wire for dragging said tubular body thereto, at least one vertically mounted cultivating blade attached to said tubular body, and a vertically mounted plow-type digging blade provided in the front end thereof with a sharp knife edge and attached to said tubular body in the rear of said cultivating blade and having side surfaces gradually diverging, towards the rear portion thereof, and a plurality of cable guide cylinders each consisting of two cylinder halves each having flange, and held together by bolts passing through said flanges with said towing wires sandwiched therebetween and arranged side by side in the front of said tubular body to form an extension of said tubular body.

Claim 5

A plow-type cable-burying device comprising a tubular body through which is passed a cable to be buried in the ground under water, sledges attached to said tubular body one on each side of its center line, said sledges being adapted to remain in contact with the ground under water in spite of variations in the ground contour and to stabilize the attitude of said tubular body, a metal fitting secured to the front end of said tubular body and adapted to attach at least one towing wire for dragging said tubular body thereto, at least one vertically mounted cultivating blade attached to said tubular body, and a vertically mounted plow-type digging blade provided in the front end thereof with a sharp knife edge and attached to said tubular body in the rear of said cultivating blade and having side surfaces gradually diverging, towards the rear portion thereof, and a plurality of cable guide cylinders each consisting of two cylinder halves each having flange, and held together by bolts passing through said flanges with said towing wires sandwiched therebetween and arranged side by side in the front of said tubular body to form an extension of said tubular body.

Claim 6

A plow-type cable-burying device comprising a tubular body through which is passed a cable to be buried in the ground under water, sledges attached to said tubular body one on each side of its center line, said sledges being adapted to remain in contact with the ground under water in spite of variations in the ground contour and to stabilize the attitude of said tubular body, a metal fitting secured to the front end of said tubular body and adapted to attach at least one towing wire for dragging said tubular body thereto, at least one vertically mounted cultivating blade attached to said tubular body, and a vertically mounted plow-type digging blade provided in the front end thereof with a sharp knife edge and attached to said tubular body in the rear of said cultivating blade and having side surfaces gradually diverging towards the rear portion thereof, said vertically mounted plow-type digging blade consisting of a hollow soil repelling element and a digging element swingably mounted in the front of said hollow soil repelling element, said hollow soiL repelling element including a swing mechanism for swinging to and fro said digging element in the moving direction thereof.

Claim 7

A plow-type cable-burying device comprising a tubular body through which is passed a cable to be buried in the ground under water, sledges attached to said tubular body one on each side of its center line, said sledges being adapted to remain in contact with the ground under water in spite of variations in the ground contour and to stabilize the attitude of said tubular body, a metal fitting secured to the front end of said tubular body and adapted to attach at least one towing wire for dragging said tubular body thereto, at least one vertically mounted cultivating blade attached to said tubular body, and a vertically mounted plow-type digging blade provided in the front end thereof with a sharp knife edge and attached to said tubular body in the rear of said cultivating blade and having side surfaces gradually diverging towards the rear portion thereof, said vertically mounted plow-type digging blade consisting of a hollow soil repelling element and a digging element swingably mounted in the front of said hollow soil repelling element, said hollow soiL repelling element including a swing mechanism for swinging to and fro said digging element in the moving direction thereof.

Claim 8

A plow-type cable-burying device as claimed in claim 4 wherein said hollow soil repelling element is provided with a weight incorporated therein.

Claim 9

A plow-type cable burying device comprising a tubular body consisting of a cable inlet portion extending in a direction in parallel with the ground under water, an intermediate bent portion gradually bent downward, and a cable outlet portion opened at the bottom of a trench being dug by the device, sledges attached to said tubular body one on each side of its center line, said sledges being adapted to remain in contact with the ground under water in spite of variations in the ground contour and to stabilize the attitude of said tubular body, a metal fitting secured to the front end of said tubular body and adapted to attach at least one towing wire for dragging said tubular body thereto, at least one vertically mounted cultivating blade attached to said tubular body, and a vertically mounted plow-type digging blade secured to said intermediate bent portion of said tubular body and provided in the front end thereof with a sharp knife edge and having side surfaces gradually diverging towards the rear portion thereof, a plurality of cable guide cylinders each consisting of two cylinder halves each having flanges, and held together by bolts passing through said flanges with said towing wires sandwiched therebetween and arranged side by side in the front of said tubular body to form an extension of said tubular body.

Claim 10

A plow-type cable burying device comprising a tubular body consisting of a cable inlet portion extending in a direction in parallel with the ground under water, an intermediate bent portion gradually bent downward, and a cable outlet portion opened at the bottom of a trench being dug by the device, sledges attached to said tubular body one on each side of its center line, said sledges being adapted to remain in contact with the ground under water in spite of variations in the ground contour and to stabilize the attitude of said tubular body, a metal fitting secured to the front end of said tubular body and adapted to attach at least one towing wire for dragging said tubular body thereto, at least one vertically mounted cultivating blade attached to said tubular body, and a vertically mounted plow-type digging blade secured to said intermediate bent portion of said tubular body and provided in the front end thereof with a sharp knife edge and having side surfaces gradually diverging towards the rear portion thereof, a plurality of cable guide cylinders each consisting of two cylinder halves each having flanges, and held together by bolts passing through said flanges with said towing wires sandwiched therebetween and arranged side by side in the front of said tubular body to form an extension of said tubular body.

Claim 11

A plow-type cable-burying device comprising a tubular body consisting of a cable inlet portion extending in a direction in parallel with the ground under water, an intermediate bent portion gradually bent downward, and a cable outlet portion opened at the bottom of a trench being dug by the device, sledges attached to said tubular body one on each side of its center line, said sledges being adapted to remain in contact with the ground under water in spite of variations in the ground contour and to stabilize the attitude of said tubular body, a metal fitting secured to the front end of said tubular body and adapted to attach at least one towing wire for dragging said tubular body thereto, at least one vertically mounted cultivating blade attached to said tubular body, and a vertically mounted plow-type digging blade secured to said intermediate bent portion of said tubular body and provided in the front end thereof with a sharp knife edge and having side surfaces gradually diverging towards the rear portion thereof, said vertically mounted plow-type digging blade consisting of a hollow soil repelling element and a digging element swingably mounted in the front of said hollow soil repelling element, said hollow soil repelling element including a swing mechanism for swinging to and fro said digging element in the moving direction thereof.

Claim 12

A plow-type cable-burying device comprising a tubular body consisting of a cable inlet portion extending in a direction in parallel with the ground under water, an intermediate bent portion gradually bent downward, and a cable outlet portion opened at the bottom of a trench being dug by the device, sledges attached to said tubular body one on each side of its center line, said sledges being adapted to remain in contact with the ground under water in spite of variations in the ground contour and to stabilize the attitude of said tubular body, a metal fitting secured to the front end of said tubular body and adapted to attach at least one towing wire for dragging said tubular body thereto, at least one vertically mounted cultivating blade attached to said tubular body, and a vertically mounted plow-type digging blade secured to said intermediate bent portion of said tubular body and provided in the front end thereof with a sharp knife edge and having side surfaces gradually diverging towards the rear portion thereof, said vertically mounted plow-type digging blade consisting of a hollow soil repelling element and a digging element swingably mounted in the front of said hollow soil repelling element, said hollow soil repelling element including a swing mechanism for swinging to and fro said digging element in the moving direction thereof.

Claim 13

A plow-type cable-burying device as claimed in claim 7 wherein said hollow soil repelling element is provided with a weight incorporated therein.