公开(公告)号：US5100485A

公开(公告)日：1992-03-31

申请号：US465190

申请日：1990-02-21

申请人： Fumitoshi Yamashita ,  Masami Wada

发明人： Fumitoshi Yamashita ,  Masami Wada

IPC分类号： H01F1/057 ,  H01F41/02

CPC分类号： H01F41/0273 ,  H01F1/0576

摘要： A method for manufacturing permanent magnets from a plurality of thin flakes of a rare earth-Fe-B alloy metal, comprising the steps ofsubjecting the thin flakes to a discharge electric field, the thin flakes being comprised of an R-Fe-B alloy metal; and R-Fe-B-M alloy metal; an R-Fe(Co)-B alloy metal comprising 11 to 18 atom % R, 4 to 11 atom % B, 30 atom % Co, the balance being Fe; and/or an R-Fe(Co)-M-B alloy metal,generating Joule heat on the contacting interfaces of the thin flakes by applying pressure to the gathered body of thin flakes and by supplying a current thereto, andbonding the gathered body integrally by making the thin flakes deform plastically in a warm state.R is one or more rare earth elements and M is one or more members selected from the group consisting of Si, Al, Nb, Zr, Hf, Mo, Ga, P and C. The thin flakes are in a nonequilibrium state such that the R.sub.2 Fe.sub.14 B phases and amorphous phases are coexistent.

公开(公告)号：US4326736A

公开(公告)日：1982-04-27

申请号：US142165

申请日：1980-04-14

申请人： Hiroshi Kusumi ,  Masami Wada

发明人： Hiroshi Kusumi ,  Masami Wada

IPC分类号： E21B21/02 ,  F16L27/00

CPC分类号： E21B21/02

摘要： A swivel joint to be located at the upper end of a drill string in reverse circulation drills to support loads occurring on the drill string, the swivel joint including a fixed outer housing, a center housing rotatably mounted in the outer housing through bearings, a hollow inner housing vertically slidably fitted in the center housing, and an upper lid fixedly mounted on the outer housing to close the inner and center housings, the inner housing having at the upper and lower ends thereof flanged projections extending toward the center housing to restrict the range of the vertical sliding movement of the inner housing and being, after imposition and release of a downward thrust, slid upward within a range defined by a spacing between the flanged projection at the lower end of the inner housing and the lower end of the center housing subject to an upward thrust acting thereon, thereby preventing transmission of the upward thrust to the outer housing.

摘要翻译： 一个旋转接头，位于反向循环钻头的钻柱的上端，以支撑在钻柱上发生的载荷，旋转接头包括固定的外壳，通过轴承可旋转地安装在外壳中的中心壳体， 内壳体，其可垂直地可滑动地装配在中心壳体中，以及固定地安装在外壳体上以封闭内壳体和中心壳体的上盖，内壳体在其上端和下端具有朝向中心壳体延伸的凸缘突出部， 内壳体的垂直滑动运动并且在施加和释放向下的推力之后，在由内壳体的下端处的凸缘和中心壳体的下端之间的间隔限定的范围内向上滑动 承受作用在其上的向上的推力，从而防止向上的推力传递到外壳体。