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    • 6. 发明专利
    • METHOD AND APPARATUS FOR PULSE EDDY CURRENT EXAMINATION
    • JPH11326284A
    • 1999-11-26
    • JP12595898
    • 1998-05-08
    • YONEKURA SEISAKUSHO KK
    • KITAGAWA SHIGERU
    • G01N27/90
    • PROBLEM TO BE SOLVED: To eliminate influences of pseudo signals as much as possible, and improve detection sensitivity for a state abnormality at the inside or a rear face of a body to be inspected having a relatively large electric resistivity. SOLUTION: This pulse eddy current examination apparatus includes a sensor 1 which has a secondary coil 3 wound in the periphery of a core, and a primary coil 5 wound in the periphery of a hollow cylindrical core set outside the secondary coil 3, a pulse current generation circuit 51 connected to the primary coil 5 for supplying a pulse current, and a detection circuit 54 connected to the secondary coil 3. The detection circuit 54 has sampling time set circuits 56-60 for outputting a sampling pulse voltage at a predetermined time near a peak of an induced voltage at the secondary coil 3, and smoothing circuits 63, 64 for smoothing output voltages of sampling circuits 61, 62. A change of a voltage value of the induced voltage is detected, whereby a state abnormality at a front face, the inside and a rear face of a body to be inspected is detected.
    • 8. 发明专利
    • FASTENING DEVICE OF SCREW TYPE REINFORCEMENT JOINT
    • JPH10152991A
    • 1998-06-09
    • JP33040196
    • 1996-11-25
    • YONEKURA SEISAKUSHO KK
    • ONISHI YASUHIRO
    • E04G21/12
    • PROBLEM TO BE SOLVED: To provide a clamping device of screw type reinforcement joints which securely holds reinforcements although it is simple in the constitution and relatively rotates to sufficiently clamp the reinforcements and the sleeve and which can hold the reinforcements, even if the diameter thereof is a little different from each other. SOLUTION: A reinforcement 100 in which a screw is cut 100a at the end and a sleeve 101 are screwed and clamped together. The first divided body 10 fixed to the sleeve 101 and the second divided part 20 holding the reinforcement 100 are connected to each other so as to be relatively rotatable around the center axis P and a clamping structure 40 is provided to relatively rotate the first and second divided bodies 10, 20. The holding structure 30 holding the reinforcement 100 in the second divided body 20 is provided with a pair of pivot shafts 22, 22 arranged parallelly to the center axis P, four movable pieces 31, 32 movably supported by these pivot shafts, and a drawing tool 34 for the mutual movable pieces 31, 32 oppositely arranged so as to set closely the contact part provided in the movable pieces 31, 32 to approach the reinforcement 100.
    • 9. 发明专利
    • IMPACT EVALUATING TESTER
    • JPH06201555A
    • 1994-07-19
    • JP34837992
    • 1992-12-28
    • YONEKURA SEISAKUSHO KK
    • OKABE TARO
    • G01N3/30G01N3/31
    • PURPOSE:To receive the impact load of a hammer with a simple supporting structure and omit base fixing with anchor bolts and the like by providing lever-type anvils supported with anvil shafts, which are implanted in a substrate. CONSTITUTION:A pair of lever-type anvils 36 are supported with anvil shafts 38, which are implanted in a stage 26, on the fixing stage 26. A test piece 14 is set in front of the anvils 14. After a hammer 28 is lifted to a specified height, the hammer 28 is freely moved downward along a moving locus. The hammer 28 horizontally hits the test piece 14. The test piece 14 is broken by the impact. The actually measured data are operated, and the toughness of the test piece 14 is evaluated. The impact load Fo of the hammer 28 loaded on the test piece 14 is divided into two parts for a pair of the anvils 36. After the direction of the load is reversed by 180 deg., the load is transferred into a rotation regulating part 26a through a supporting block 40. At this time, force F2 acting on the regulating part 26a is attenuated in response to the ratio between a distance L1 and a diatance L2.