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11. 发明授权

US5637968A Power tool with automatic downshift feature 失效
标题翻译：电动工具具有自动降挡功能
公开(公告)号：US5637968A
公开(公告)日：1997-06-10
申请号：US141783
申请日：1993-10-25
申请人： Stephen M. Kainec , William L. Naumann
发明人： Stephen M. Kainec , William L. Naumann
IPC分类号： B25B21/00 , B23P19/06 , B25B23/14 , B25B23/151 , G05D17/02 , B25B23/147
CPC分类号： B23P19/066 , B25B23/14 , B25F5/001 , G05D17/02 , Y10T29/49764 , Y10T29/5303
摘要： A method and apparatus for correcting torque overshoot in power tools wherein torque per angle rate is sensed on each rundown and the speed of the tool is automatically adjusted to maintain torque accuracy on higher torque rate joints while maintaining speed on lower torque rate joints, automatically minimizing tool heating and maximizing job rate. In the setting of threaded fasteners, joint rates are defined as high (hard), medium or low (soft). Two torque points are defined, a first torque point and a second torque point, which are percentages of the target torque, for example 25% and 50% respectively. Two angle values are defined corresponding to the number of degrees of tool spindle rotation measured along the portion of the torque/angle curve between the first torque point and the second torque point on typical linear hard and medium joints. Two final tightening speeds are defined as percentages of full speed corresponding to the tool system requirements for accurate shutoff on the two types of joints, hard and medium. A controller counts the number of angle degrees between the first torque point and the second torque point. The angle counted is compared with the values of hard and medium angles to determine the joint rate. If the angle is less than or equal to the hard angle, the joint is considered hard and the controller immediately downshifts the tool to the hard speed. If the angle is greater than the hard angle but less than or equal to the medium angle, the joint is considered medium and the controller immediately downshifts the tool to the medium speed. If the angle is greater than the medium angle, the joint is considered soft and the speed is not changed.
摘要翻译：一种用于校正电动工具中的转矩过冲的方法和装置，其中每个衰减检测到每个角度速度的扭矩，并且自动调节工具的速度以在较高扭矩速率接头上保持扭矩精度，同时保持较低转矩关节处的速度，自动最小化工具加热和最大化工作率。在螺纹紧固件的设置中，联合速率被定义为高（硬），中或低（软）。定义了两个转矩点，即第一转矩点和第二转矩点，分别是目标转矩的百分比，例如25％和50％。两个角度值对应于在典型的线性硬和中间接头上沿着第一扭矩点和第二扭矩点之间的扭矩/角度曲线部分测量的刀具主轴旋转度数。两个最终紧固速度定义为对应于两种类型的接头（硬质和中型）上精确关闭的刀具系统要求的全速百分比。控制器对第一转矩点和第二转矩点之间的角度数进行计数。将计算的角度与硬和中等角度的值进行比较以确定联合速率。如果角度小于或等于硬角，则认为接头很硬，控制器立即将刀具降档到硬转速。如果角度大于硬角度但小于或等于中等角度，则接头被认为是中等角度，并且控制器立即将刀具降档到中等速度。如果角度大于中等角度，则关节被认为是软的，速度没有改变。

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