公开(公告)号：US3383974A

公开(公告)日：1968-05-21

申请号：US65511267

申请日：1967-07-21

申请人： NORMAN C. DAHL

发明人： DAHL NORMAN C

IPC分类号： F16B31/02 ,  F16B33/04

CPC分类号： F16B31/02 ,  F16B31/024

公开(公告)号：US3383961A

公开(公告)日：1968-05-21

申请号：US65554667

申请日：1967-07-24

申请人： NORMAN C. DAHL

发明人： DAHL NORMAN C

IPC分类号： B25B23/14 ,  B25B23/145 ,  B25B23/147 ,  F16B31/02 ,  G01L5/24

CPC分类号： B25B23/147 ,  B25B23/14 ,  B25B23/1456 ,  F16B31/02 ,  F16B31/024 ,  G01L5/24 ,  G01L5/243

公开(公告)号：US4142266A

公开(公告)日：1979-03-06

申请号：US816265

申请日：1977-07-18

申请人： Norman C. Dahl

发明人： Norman C. Dahl

IPC分类号： F16B31/02

CPC分类号： F16B31/02 ,  Y10T29/49766

摘要： An improved method for creating built-in overload protection against further yielding in a bolt which previously has been tightened to its yield point, the method comprising rotating the bolt head or nut in the direction opposite from tightening while measuring the wrenching torque required for this rotation and stopping the rotation when the magnitude of the wrenching torque indicates that the torque acting in the bolt shank is fifty percent or less of the value existing at the end of tightening; and, a pulsed air motor wrench which at the end of tightening a bolt to its yield point automatically shifts to an untightening mode of operation and stops untightening when the untightening wrenching torque becomes equal to or exceeds the value CT.sub.WY wherein C is a numerical constant determined theoretically or experimentally and T.sub.WY is the wrenching torque acting at the end of tighening.

摘要翻译： 一种用于产生内置过载保护的改进方法，以防止先前已被紧固到其屈服点的螺栓中的进一步屈服，所述方法包括在测量所述旋转所需的扭矩扭矩的同时沿与紧固方向相反的方向旋转螺栓头或螺母 并且当扭矩扭矩的大小表示作用在螺栓柄中的扭矩是在紧固结束时存在的值的百分之五十以下时停止旋转; 并且在拧紧螺栓到其屈服点的结束时的脉冲气动马达扳手自动地转换到不紧固的操作模式，并且当不拧紧的扳手扭矩变得等于或超过值CTWY时停止拧紧，其中C是确定的数值常数 理论上或实验上都是TWY，而在振动结束时作用的扭矩扭矩是TWY。

公开(公告)号：US4078273A

公开(公告)日：1978-03-14

申请号：US794302

申请日：1977-05-05

申请人： Norman C. Dahl

发明人： Norman C. Dahl

IPC分类号： B21K1/44

CPC分类号： B21K1/44 ,  Y10S411/916 ,  Y10T29/49874

摘要： A method for manufacturing bolts of a given grade and size in which, after forming, threading and heat treating, each bolt is work hardened by the application and subsequent removal of a tensile force of magnitude somewhat above the minimum proof load for the given grade and size of bolt, so that all bolts so treated will have the same yield point and the torque rotation curve for each bolt will have a discontinuity in slope at this common yield point.

摘要翻译： 一种用于制造给定等级和尺寸的螺栓的方法，其中，在成形，螺纹加工和热处理之后，每个螺栓通过应用进行加工硬化，并随后去除一定幅度以上的拉伸力，该拉伸力略高于给定等级的最小防护载荷， 所以如此处理的所有螺栓将具有相同的屈服点，并且每个螺栓的扭矩旋转曲线在该共同屈服点处将具有斜率不连续性。

公开(公告)号：US3431812A

公开(公告)日：1969-03-11

申请号：US3431812D

申请日：1968-01-30

申请人： NORMAN C DAHL

发明人： DAHL NORMAN C

IPC分类号： F16B31/02 ,  F16B33/04

CPC分类号： F16B31/02 ,  F16B31/024

公开(公告)号：US4338054A

公开(公告)日：1982-07-06

申请号：US095165

申请日：1979-11-19

申请人： Norman C. Dahl

发明人： Norman C. Dahl

IPC分类号： F16B35/04 ,  F16B35/00

CPC分类号： F16B35/041 ,  Y10T29/49766

摘要： A metal fastener characterized by a sharp yield point and improved elongation beyond the yield point and a tensile strength (force) at least as large as the specified minimum for the grade, size, and threads of said metal fastener, which metal fastener has a nominal diameter D and comprises: one or more externally threaded components having threads of nominal diameter D with a stress area A.sub.s ; a nonthreaded shank component having a diameter D.sub.s equal to or substantially equal to the nominal diameter D extending axially with the threaded components; the shank component characterized by a reduced portion of axial length L.sub.r, the reduced portion having an axially transverse cross-sectional area A.sub.r sufficiently less than the stress area A.sub.s of the threaded components along substantially the axial length L.sub.r, whereby, on tightening of the metal fastener to failure the failure occurs in the reduced portion of the shank component; and means with the reduced portion, extending substantially the axial length L.sub.r, to align the reduced portion of the metal fastener in a passageway in which the metal fastener is to be employed.

摘要翻译： 一种金属紧固件，其特征在于锋利的屈服点和改善的伸长率超过屈服点，拉伸强度（力）至少等于所述金属紧固件的等级，尺寸和螺纹的规定最小值，该金属紧固件具有标称 直径D并且包括：一个或多个外螺纹部件，其具有标称直径D的线，其具有应力面积As; 直径Ds等于或基本上等于与螺纹部件轴向延伸的标称直径D的非螺纹柄部件; 所述柄部件的特征在于轴向长度Lr减小的部分，所述减小部分的轴向横截面积Ar足够小于沿着所述轴向长度Lr的所述螺纹部件的应力面积A 1，由此，在所述金属 发生故障的紧固件发生在柄部件的减少部分中; 以及具有减小部分的装置，基本上延伸轴向长度Lr，以将金属紧固件的减少部分对准在其中将使用金属紧固件的通道中。

公开(公告)号：US4035858A

公开(公告)日：1977-07-19

申请号：US664574

申请日：1976-03-08

申请人： Norman C. Dahl

发明人： Norman C. Dahl

IPC分类号： B21K1/44

CPC分类号： B21K1/44 ,  Y10S411/916 ,  Y10T29/49874

摘要： A method for manufacturing bolts of a given grade and size in which, after forming, threading and heat treating, each bolt is work hardened by the application and subsequent removal of a tensile force of magnitude somewhat above the minimum proof load for the given grade and size of bolt, so that all bolts so treated will have the same yield point and the torque rotation curve for each bolt will have a discontinuity in slope at this common yield point.

摘要翻译： 一种用于制造给定等级和尺寸的螺栓的方法，其中，在成形，螺纹加工和热处理之后，每个螺栓通过应用进行加工硬化，并随后去除一定幅度以上的拉伸力，该拉伸力略高于给定等级的最小防护载荷， 所以如此处理的所有螺栓将具有相同的屈服点，并且每个螺栓的扭矩旋转曲线在该共同屈服点处将具有斜率不连续性。

公开(公告)号：US4348141A

公开(公告)日：1982-09-07

申请号：US95166

申请日：1979-11-19

申请人： Norman C. Dahl

发明人： Norman C. Dahl

IPC分类号： F16B35/04 ,  F16B35/00 ,  F16B31/02

CPC分类号： F16B35/04 ,  Y10T29/49766

摘要： A metal fastener having a well-defined yield point and improved elongation beyond the yield point and a tensile strength (force) at least as large as the specified minimum for the grade, size, and threads of said metal fastener, the metal fastener of nominal diameter D, which metal fastener comprises in combination: an externally threaded component having threads of nominal diameter D; a circular, cylindrical shank component having a diameter D.sub.S equal to or substantially equal to said nominal diameter D extending axially to one end of the threaded component; and a head component for the application of torque to the fastener extending axially to the other end of the shank component; the fastener being characterized by an axially extending hollow cavity positioned therein within the shank component, and not extending substantially into the threaded component, the maximum cross-sectional area of the hollow cavity in the shank component being greater than the minimum cross-sectional area within any part of the hollow cavity which extends into the head or threaded components.

摘要翻译： 金属紧固件具有明确的屈服点和超出屈服点的提高的伸长率，以及至少与所述金属紧固件的等级，尺寸和螺纹的规定最小值相同的拉伸强度（力），金属紧固件的标称 直径D，该金属紧固件组合包括具有公称直径D的螺纹的外螺纹部件; 直径DS等于或基本上等于所述公称直径D的圆形圆柱形柄部件，其轴向延伸到螺纹部件的一端; 以及用于向所述紧固件施加扭矩的头部部件，其轴向延伸到所述柄部件的另一端; 紧固件的特征在于轴向延伸的中空腔体，其定位在柄部件内部，并且基本上不延伸到螺纹部件中，柄部件中的中空腔的最大横截面面积大于其内部的最小横截面积 中空腔的任何部分延伸到头部或螺纹部件中。

公开(公告)号：US4037282A

公开(公告)日：1977-07-26

申请号：US693546

申请日：1976-06-07

申请人： Norman C. Dahl

发明人： Norman C. Dahl

IPC分类号： B21K1/44 ,  F16B31/02

CPC分类号： B21K1/44 ,  Y10T29/49948

摘要： A method for creating built-in overload protection against further yielding in a threaded bolt which previously has been tightened to its yield point, said method comprising: reducing the torque acting in the shank of said bolt to fifty percent or less of the value existing at the end of tightening, said reduction in torque being accomplished by rotating the bolt head or the nut in the direction opposite from tightening through an angle .theta. such that the reduction in twist of said shank causes said torque to reduce to fifty percent or less of the value existing at the end of tightening and where said angle of rotation .theta. is not large enough to cause decrease in the tension existing in said bolt at the end of tightening.

摘要翻译： 一种用于产生内置过载保护的方法，以防止先前已被紧固到其屈服点的螺栓中的进一步屈服，所述方法包括：将作用在所述螺栓的柄中的扭矩减小到存在于 紧固的结束，所述扭矩的减小是通过使螺栓头或螺母沿相反的方向旋转通过角度θ来实现的，使得所述柄的扭转减小导致所述扭矩减小到50％ 在紧固结束时存在的值，并且其中所述旋转角θ不足以在紧固结束时引起存在于所述螺栓中的张力的减小。