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    • 2. 发明授权
    • Deep ripper point
    • 深裂皮点
    • US5165487A
    • 1992-11-24
    • US669753
    • 1991-03-15
    • Robert A. WilliamsWilliam A. Bell
    • Robert A. WilliamsWilliam A. Bell
    • A01B15/02E02F9/28
    • E02F9/2875A01B15/025
    • The point is adapted to fit onto the forwardly projecting mounting wedge of a tillage shank and has a downwardly and forwardly inclined, elongated crown provided with a transverse, sharpened tip at its lower front end. An underslung transverse wall looped under the crown at the front end of the point defines a rearwardly opening socket that matingly receives the apex of the mounting wedge of the shank, and depending sidewalls on the crown adjacent its opposite lateral edges rearwardly of the underslung wall serve to present a protective trough on the underside of the crown that matingly receives the upper surface of the mounting wedge so as to protectively cover otherwise exposed side portions of the wedge and thus shield such areas from exposure of abrasive soils. Two alternate embodiments are disclosed, one of which has lateral side edges of the crown intersecting cleanly with upright surface of the underslung wall and the sidewalls, and the other of which has side edge of the crown overhanging such structures and provided with a certain vertical thickness dimension.
    • 该点适于装配在耕作柄的向前突出的安装楔上,并且具有向下且向前倾斜的细长冠部,其在其前前端处设有横向尖锐的尖端。 位于该点前端的冠部下面的一个下悬的横向壁限定了一个向后开口的插座,该插座配合地接纳柄的安装楔形件的顶点,并且与顶壁相邻的相对侧边缘上的侧壁相邻, 在冠的下侧上设置保护槽,该保护槽匹配地接纳安装楔的上表面,以保护地覆盖楔的另外暴露的侧部,并且因此屏蔽这些区域免受磨损土壤的暴露。 公开了两个替代实施例,其中一个具有冠部的侧向侧边缘与下壁和侧壁的直立表面完全相交,另一个实例具有突出于该结构的冠的侧边缘并且具有一定垂直厚度 尺寸。
    • 8. 发明授权
    • Active Q-switched high power single mode laser
    • 主动Q开关大功率单模激光器
    • US4197513A
    • 1980-04-08
    • US859036
    • 1977-12-09
    • William A. BellRichard L. Herbst
    • William A. BellRichard L. Herbst
    • H01S3/115H01S3/11
    • H01S3/115
    • A high power single mode laser is disclosed which includes a Q-switch for switching the laser on in two stages: firstly, to a relatively high loss level just above threshold where it is held to permit a train of relaxation oscillator spikes to be established and then it is switched to a second stage in which the Q-switch is in a lossless state to allow the resonant mode within the laser to build up to maximum power. An optical detector monitors the resonant optical radiation level within the optical resonator and produces an output signal for each of the relaxation spikes. A trigger circuit, responsive to the detected oscillator spikes, triggers the Q-switch so as to switch it to the second or lossless state upon receipt of the second or any other subsequent relaxation oscillator spike, whereby single longitudinal mode operation of the laser is enhanced. A pair of quarter wave plates are disposed on opposite sides of the laser gain medium within the optical resonator to make the power density distribution within the laser gain medium more uniform, thereby further enhancing single longitudinal mode operation. In a preferred embodiment, the trigger circuit includes a divider which is responsive to the detected oscillator spike signals and divides the received spike signals by two or more so that the laser is caused to fire upon initiation of the second or subsequent relaxation oscillator spike.
    • 公开了一种高功率单模激光器,其包括用于在两个阶段中切换激光器的Q开关:首先,在刚好高于阈值的相对高的损耗水平处,其被保持以允许建立一系列松弛振荡器尖峰, 然后切换到第二阶段,其中Q开关处于无损状态,以允许激光器内的谐振模式建立到最大功率。 光学检测器监测光学谐振器内的谐振光辐射水平,并产生每个松弛尖峰的输出信号。 响应于检测到的振荡器尖峰的触发电路触发Q开关,以便在接收到第二或任何其它随后的张弛振荡器尖峰时将其切换到第二或无损状态,由此增加激光的单纵模操作 。 在光谐振器内的一对四分之一波片设置在激光增益介质的相对两侧,使得激光增益介质内的功率密度分布更加均匀,从而进一步增强单纵模运行。 在优选实施例中,触发电路包括分频器,其对所检测的振荡器尖峰信号作出响应,并将接收到的尖峰信号除以两个或更多,使得激光在第二或随后的张弛振荡器尖峰开始时被引发。