Gear cutting – milling – or planing – Milling – Means for internal milling
Patent
1992-01-04
1993-08-24
Howell, Daniel W.
Gear cutting, milling, or planing
Milling
Means for internal milling
166 552, 408138, 408141, B23C 300
Patent
active
052383385
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The decontamination and making fluid-tight of old water, gas, or sewer mains are often obtained by application, inside the conduit, of a fluid-tight sheath, of plastic, of resin, or by a lining of fabric coated with resin. This application may be made over several hundreds of meters without a break in continuity. The various inlets of secondary branches or of branches of buildings are then obstructed by the fluid-tight layer deposited. Piercing of said layer from the outside necessitates the opening of the roadway at each building inlet, the dismantling of the inlet, then the piercing of the sheath in order to restore the branch. These operations are extremely expensive and, in addition, pose numerous traffic problems when the branch to be restored is situated under a roadway.
SUMMARY OF THE INVENTION
The device of the present invention permits a piercing, milling, or grinding operation of the layer obstructing the branch, from the inside of the canalization, without its being necessary to open the roadway at that spot.
It is a matter of a device moving longitudinally within the conduit and capable of effecting a piercing right through the canalization, perpendicular to the axis thereof, from the inside toward the outside, after the spot to be pierced has been located and the device has been positioned precisely facing this spot.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 depicts the set of different modules necessary for effecting the operation,
FIG. 2 depicts a longitudinal section of the positioning module,
FIG. 3 depicts a longitudinal section of the piercing module,
FIG. 4 depicts a section of the tool-holder.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The canalization 1 depicted in FIG. 1 is made up of a cylindrical conduit 10, which may be of cast iron, of steel, of plastic, of cement, or of Eternit [asbestos cement]; the diameter of such mains pipes is generally between 100 and 250 mm, but nothing hinders the device described here from being able to operate in canalizations of smaller or larger diameter. In order to decontaminate this conduit, an inner lining 11 has been placed according to a process not described here; this lining obstructs the branching of the secondary conduit 12, forming a slight vault-shaped subsidence 13, as well as a plug 14 composed of excess material.
Since the diameter of the canalization limits the size of the equipment that can be placed in it, the equipment and its accessories will have to be disposed lengthwise, along the axis of the conduit. Further, to take longitudinal changes of direction of the canalization into account, they will have to be separated into different relatively short modules, articulated relative to one another.
The sequence of the different modules is made up, according to one embodiment, as depicted in FIG. 1, of a piercing module 2 comprising a tool-holder 20 and a television camera 21, followed by a positioning module 3, then by a traction module 4 and a relieving module 5. The latter is connected to a control; desk 6 by a combined cable 7 coming from a cable spool 70 permitting the necessary length of cable to be supplied.
At the ends and between each module, support devices 8, fixed to the modules, comprise three rollers resting on three equidistant points on a circumference of the canalization, so as to permit a longitudinal displacement of the whole of the device, as well as its centering relative to the longitudinal axis of the conduit. The support arms of these rollers are interchangeable, and their length is chosen in order to adapt to the diameter of the conduit to be explored.
The traction module 4 is in conformity with the device described in Swiss patent CH 669,127 and is responsible for propelling the whole of the system from an opening point of the canalization, where the various modules are inserted one after the other, up to a point where the tool-holding spindle 20 of the piercing module 2 is close to the branch to be restored. The movement of the traction module 4 takes place by creeping and l
REFERENCES:
patent: 1962961 (1934-06-01), Liedbeck
patent: 2066409 (1937-01-01), Loving et al.
patent: 4197908 (1980-04-01), Davis et al.
patent: 4577388 (1986-03-01), Wood
patent: 4648454 (1987-03-01), Yarnell
patent: 4890962 (1990-01-01), Nydegger
patent: 4911588 (1990-03-01), Ikemoto et al.
patent: 4955951 (1990-09-01), Nemoto et al.
Canalcrab S.A.
Howell Daniel W.
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