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1. 发明授权

US4272760A Self-calibrating digital to analog conversion system and method 失效
标题翻译：自校准数模转换系统及方法
公开(公告)号：US4272760A
公开(公告)日：1981-06-09
申请号：US28667
申请日：1979-04-10
申请人： Paul R. Prazak , Theodore L. Williams
发明人： Paul R. Prazak , Theodore L. Williams
IPC分类号： H03M1/00 , H03K13/02
CPC分类号： H03M1/1071 , H03M1/66
摘要： A digital to analog conversion system includes a memory for storing a plurality of correction codes corresponding to corrections required to compensate for inaccuracy in output currents of a main digital to analog converter (DAC) contained in the digital to analog conversion system. A plurality of the logic inputs applied to the inputs of the main DAC are also applied to the address inputs of the memory. A trim DAC having its inputs coupled to the data outputs of the memory converts the correction code stored in the addressed location of the memory into a correction current which is utilized externally of the main DAC to modify the net amount of output current available from the main DAC to compensate for inaccuracy of the unmodified output current. An output signal from a temperature sensor is connected to a digital number which is also applied to a plurality of the address inputs. Correction codes stored in locations addressable in response to the temperature sensor have values which effect adjustment of the correction current to compensate for inaccuracy of the output current due to temperature variations. A self-calibration system and method which updates the correction codes stored in the memory are also disclosed.
摘要翻译：数模转换系统包括存储器，用于存储对应于补偿数模转换系统中包含的主数模转换器（DAC）的输出电流不准确所需的校正的多个校正码。施加到主DAC的输入的多个逻辑输入也被施加到存储器的地址输入。具有耦合到存储器的数据输出的输入的修整DAC将存储在存储器的寻址位置中的校正码转换为在主DAC外部使用的校正电流，以修改从主DAC可用的输出电流的净量 DAC以补偿未修改的输出电流的不准确。来自温度传感器的输出信号连接到也被应用于多个地址输入的数字号码。存储在响应于温度传感器可寻址的位置中的校正代码具有影响校正电流的调整的值，以补偿由于温度变化引起的输出电流的不精确性。还公开了更新存储在存储器中的校正码的自校准系统和方法。

2. 发明授权

US4277961A Security lock nut assembly for padlocks 失效
标题翻译：用于挂锁的安全锁紧螺母总成
公开(公告)号：US4277961A
公开(公告)日：1981-07-14
申请号：US73884
申请日：1979-09-10
申请人： Theodore L. Williams
发明人： Theodore L. Williams
IPC分类号： E05B67/38
CPC分类号： E05B67/38 , Y10T70/493 , Y10T70/5858
摘要： A security lock nut assembly for padlocks is provided which effectively prevents prying off or cutting of the padlock during use thereof. The assembly preferably includes a T-shaped padlock-engaging keeper nut having a bored main shaft, and a complemental screw secured to and extending from a support surface adjacent the padlock. In use, the keeper is positioned for engagement with a closed padlock, with the keeper shaft extending throuh the region defined by the padlock shackle and base and connected to the bolt. In this manner the padlock is held in place adjacent the support surface to restrict access to the padlock and thus prevent prying or cutting thereof. The transverse, padlock-engaging section of the keeper is sized to pass between the shackle and base only when the padlock is opened, and the keeper shaft is configured relative to the shackle to preclude rotation of the keeper when the padlock is locked in place. Simultaneous rotation of the padlock and keeper is prevented by means of projection structure located adjacent the padlock. The keeper can thus be unscrewed only when the padlock is opened and removed from the keeper.
摘要翻译：提供了一种用于挂锁的安全锁紧螺母组件，其有效地防止在使用时挂锁或切割挂锁。组件优选地包括具有钻孔主轴的T形挂锁接合保持螺母和固定到邻近挂锁的支撑表面并从其延伸的互补螺钉。在使用中，保持器定位成与封闭的挂锁接合，保持器轴延伸在由挂锁钩环和底座限定的区域上并连接到螺栓上。以这种方式，挂锁被保持在邻近支撑表面的位置，以限制进入挂锁，从而防止其撬动或切割。保持器的横向挂锁接合部分的尺寸仅在挂锁打开时才在钩环和底座之间通过，并且保持器轴相对于钩环构造，以防止挂锁锁定在适当位置时保持器的旋转。通过位于挂锁附近的突出结构来防止挂锁和保持器的同时旋转。因此，只有当挂锁打开并从保持器中取出时，保持器才能拧下。

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