Claims
- 1. A cutter head for water jet assisted cutting comprising at least one generally cylindrical and rotatable drum having a plurality of cutting tools mounted externally thereof, each having a water jet nozzle directing a high pressure water jet outwardly and directly to the tip of the said tools to assist mechanical action, means including an even number of hydraulic cylinders and corresponding plungers mounted on the inside of and rotatable with said drum, a stationary but rotatably adjustable annular cam coaxial with said drum and having an annular camming surface, said hydraulic cylinders and corresponding plungers having axes parallel to the axis of said drum, each of said plungers having one end reciprocating in the associated cylinder and the other end fitted with a flexible shoe engaging said camming surface, the plungers reciprocating movement being controlled by the cam through said flexible shoes, said flexible shoes having a cup shaped sole having an external cavity containing lubricant and designed such that the cup shaped sole is elastically flattened against the cam surface at least once at each drum revolution to create an hydrodynamic lubrication of the interface between the cam and shoe by alternatively sucking surrounding lubricant into the cup shaped sole cavity of the shoe when the pressure on the shoe is released and ejecting said lubricant when the pressure on the shoe increases.
- 2. A cutterhead as recited in claim 1 in which the cylinders in even number are contained in an internal cavity of said drum and are symetrically arranged around the drum axis to prevent any variation of volume of said cavity which encloses the plungers, the movement of one plunger being exactly compensated by the opposite movement of the diametrically located plunger so as to permit an efficient sealing of the said cavity and its filling with a lubricant.
- 3. A cutterhead as recited in claim 1 in which the plungers reciprocating movement is controlled by the said annular cam through said flexible shoes, elastic deformation of said shoes permitting the use of non planar cams having a skew camming surface.
- 4. A cutterhead for water jet assist cutting as recited in claim 1, comprising a plurality of interconnected rotatable coaxial cutting drums mounted on a common shaft, the said shaft being supported by and driven through intermediate supports, additional cutting water jets are located on said drum at the end of each drum next to an intermediate support and oriented parallel to the cutter head shaft axis to cut cores left by the cutting tools between the said cutting drums in front of the cutter head intermediate supports, said additional water jets which are not assisting a cutting tool, having the same high pressure water supply as jets assisting tools have and providing water only when jets adjacent to said additional jets are cutting.
Parent Case Info
This application is a C.I.P. of Application Ser. No. 06/658,982, filed 10/9/84.
US Referenced Citations (13)
Foreign Referenced Citations (4)
Number |
Date |
Country |
3144741 |
May 1983 |
DEX |
604996 |
Apr 1978 |
SUX |
777213 |
Dec 1980 |
SUX |
2066873 |
Jul 1981 |
GBX |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
658982 |
Oct 1984 |
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