公开(公告)号：US5206800A

公开(公告)日：1993-04-27

申请号：US892226

申请日：1992-06-02

Applicant: David A. Smith

Inventor： David A. Smith

IPC: H02M3/335

CPC classification number: H02M3/33576

Abstract: A circuit for utilizing the magnetizing current in the transformer of a converter to reset the transformer's core and to provide a zero-voltage-switching condition on the converter's primary switch and to regulate the output voltage is disclosed. The power converter includes a transformer having a primary winding and a secondary winding, the secondary winding being coupled to an output load and a primary switch connected in series between the primary winding and a voltage source. The closing of the primary switch causes energy to be stored in the transformer and the opening of the primary switch causes the energy to be released from the transformer. The utilization circuit includes a series combination of a storage capacitor and a first switch coupled in parallel with one of the transformer's windings to capture the energy released from the transformer. The captured energy is used to reset the transformer's core and to create a zero voltage switching condition across the primary switch. A second switch means is connected in series with the secondary winding of the transformer and is operated to prevent the loading effects of the secondary from interrupting the creation of the zero-voltage switching condition. A secondary side regulation circuit is included to both regulate the output voltage and to prevent the loading effects of the secondary circuit from interfering with zero-voltage switching in the primary circuit.

Abstract translation: 公开了一种利用转换器的变压器中的磁化电流来复位变压器的磁芯并在转换器的主开关上提供零电压开关状态并调节输出电压的电路。 功率转换器包括具有初级绕组和次级绕组的变压器，次级绕组耦合到输出负载和串联连接在初级绕组和电压源之间的初级开关。 主开关的关闭使得能量被存储在变压器中，并且主开关的断开导致能量从变压器释放。 利用电路包括存储电容器和与变压器绕组之一并联耦合的第一开关的串联组合，以捕获从变压器释放的能量。 捕获的能量用于复位变压器的内核并在主开关之间产生零电压开关条件。 第二开关装置与变压器的次级绕组串联连接，并且被操作以防止二次管的负载效应中断零电压开关条件的产生。 包括二次侧调节电路以调节输出电压并防止二次电路的负载效应干扰初级电路中的零电压开关。

公开(公告)号：US4977493A

公开(公告)日：1990-12-11

申请号：US379380

申请日：1989-07-13

Applicant: David A. Smith

Inventor： David A. Smith

IPC: H02M1/34 ,  H02M3/155 ,  H03K17/0814

CPC classification number: H02M1/34 ,  H02M3/155 ,  H03K17/08142 ,  H02M2001/346 ,  Y02B70/1491

Abstract: A rectifier circuit having a rectifier (D4) allowing current to flow in a forward direction to an output (V.sub.OUT). A saturable inductor (L3) in series with the rectifier (D4) blocks reverse recovery rectifier current and directs it to an inductor (L4), the energy stored in that inductor re-setting the saturable inductor (L3) to allow subsequent flow of current in the forward direction to the rectifier (D4). A capacitor (C2) absorbs surplus energy from the inductor (L4) and a rectifier (D5) guides that surplus energy to the output (V.sub.OUT). This rectifier circuit is particularly useful as part of a convertor where an electronic switch repeatedly switches current through an inductor (L1) and the energy from the inductor (L1) is delivered to the output (V.sub.OUT) via the rectifier circuit.

公开(公告)号：US4588070A

公开(公告)日：1986-05-13

申请号：US670515

申请日：1984-11-13

Applicant: David A. Smith

Inventor： David A. Smith

IPC: B65G47/90 ,  B65H31/30 ,  B65G47/22

CPC classification number: B65H31/3045 ,  B65G47/90 ,  B65H2301/42242

Abstract: Apparatus for clamping and transferring to another location stacks of bags or other products of varying sizes. The apparatus preferably includes sets of clamping jaws for grasping the stacks of bags. The jaws are designed for movement in more than one direction in substantially the same plane so that mechanisms for delivering and receiving bags can be used even if the bags from one stack vary in size from that in the next stack. Each set of clamping jaws supports as well as clamps each stack of bags, a lower support jaw being extended to a sufficient length to provide such support. The device can also accommodate bags or other products of varying wall thicknesses.

Abstract translation: 用于夹紧和转移到不同尺寸的袋或其他产品的另一位置的装置。 该装置优选地包括用于抓握袋子堆叠的一组夹爪​​。 钳口设计用于在基本上相同的平面中在多于一个方向上运动，使得即使来自一个堆叠的袋子的尺寸与下一个堆叠中的袋子尺寸不同，也可以使用用于递送和接收袋子的机构。 每组夹爪支撑并夹紧每一叠袋，下支撑爪延伸到足够的长度以提供这种支撑。 该设备还可以容纳不同壁厚的袋子或其他产品。

公开(公告)号：US4475867A

公开(公告)日：1984-10-09

申请号：US456545

申请日：1983-01-10

Applicant: David A. Smith

Inventor： David A. Smith

IPC: F04D29/66

CPC classification number: F04D29/665

Abstract: An axial fan having a central fan structure from which a plurality of blades extend radially and a center body extending axially from said central fan structure. The center body occupies a volume in which turbulence would otherwise occur. At least one side branch resonator is disposed within the center body to attenuate resonance produced by said fan in a particular frequency band.

Abstract translation: 一种具有中心风扇结构的轴流风扇，多个叶片由该风扇结构径向延伸，中心体从中心风扇结构轴向延伸。 中心体占据其中会发生湍流的体积。 至少一个侧分支谐振器设置在中心体内以衰减在特定频带中由所述风扇产生的共振。

公开(公告)号：US4304879A

公开(公告)日：1981-12-08

申请号：US198849

申请日：1980-10-20

Applicant: Wendell A. Ehrhart ,  David A. Smith

Inventor： Wendell A. Ehrhart ,  David A. Smith

IPC: C08F299/04 ,  C08G63/21 ,  C09D167/06 ,  C08L67/00

CPC classification number: C08F299/04 ,  C08G63/21 ,  C09D167/06

Abstract: A family of non-crystallizing acrylated polyester resins are described in which the polyesters are formed by reacting a mixture of 100 mol percent dicarboxylic acids of which 50 to 100 mol percent is isophthalic acid; 0 to 25 mol percent is terephthalic acid; and 0 to 50 mol percent is one or more dicarboxylic acids other than isophthalic or terephthalic; with an excess of two or more primary glycols, the maximum mol percent of any one glycol being dependent on the amount of isophthalic acid with the upper limit being established by the line A-B of the FIGURE of the Drawing.

Abstract translation: 描述了一系列非结晶的丙烯酸酯化的聚酯树脂，其中聚酯通过使50摩尔％至100摩尔％的间苯二甲酸的100摩尔％的二羧酸的混合物反应而形成; 0〜25摩尔％为对苯二甲酸; 0〜50摩尔％是除间苯二甲酸或对苯二甲酸以外的一种或多种二羧酸; 使用过量的两种或更多种二醇，任何一种二醇的最大摩尔百分数取决于间苯二甲酸的量，其上限是通过附图的线A-B确定的。

公开(公告)号：US4172597A

公开(公告)日：1979-10-30

申请号：US904750

申请日：1978-05-11

Applicant: David A. Smith ,  John M. Grace

Inventor： David A. Smith ,  John M. Grace

IPC: A63F3/06

CPC classification number: A63F3/062 ,  A63F2003/00927

Abstract: An improved magnetic pick-up device and marker for use in games includes a rectangular ferromagnetic member having a length substantially greater than width. The ferromagnetic member is fixedly received in a rectangular socket affixed to an elongated handle. The handle with the ferromagnetic member affixed thereto may then be used to retrieve a circular marker formed of translucent material and having ferromagnetic properties after the marker has been utilized as an indicator in a game.

Abstract translation: 用于游戏的改进的拾磁装置和标记器包括具有基本上大于宽度的长度的矩形铁磁构件。 铁磁构件固定地容纳在固定到细长手柄上的矩形插座中。 然后可以使用固定在其上的铁磁构件的手柄来取回由半透明材料形成的圆形标记，并且在标记已经用作游戏中的指标之后具有铁磁性质。

公开(公告)号：US4103445A

公开(公告)日：1978-08-01

申请号：US719687

申请日：1976-09-02

Applicant: David A. Smith ,  Thomas P. Hertrick

Inventor： David A. Smith ,  Thomas P. Hertrick

IPC: G09F7/00

CPC classification number: G09F7/00

Abstract: A portable sign assembly comprising a rigid knockdown frame and a flexible display web. In a collapsed condition elements of the sign assembly afford a relatively small package size which is conveniently handled and economically shipped. The sign is quickly assembled and disassembled by simple manipulation of the frame elements. In accordance with an important aspect of the invention, the display web is provided with relatively high elastic elongation properties and the frame is arranged to slightly stretch the web to thereby completely tension it and ensure that it is drawn into a planar configuration.

Abstract translation: 一种便携式标志组件，包括刚性击倒框架和柔性显示网。 在折叠状态下，标志组件的元件提供相对较小的包装尺寸，其方便地处理和经济地运输。 通过对框架元件的简单操纵，可以快速组装和拆卸标志。 根据本发明的重要方面，显示幅材具有相对高的弹性伸长性能，并且该框架被布置为稍微拉伸幅材，从而完全将其张紧并确保其被拉成平面构型。

公开(公告)号：US4094760A

公开(公告)日：1978-06-13

申请号：US818846

申请日：1977-07-25

Applicant: David A. Smith ,  John J. Davidson

Inventor： David A. Smith ,  John J. Davidson

IPC: C25D13/00 ,  C25D13/14 ,  C25D13/12

CPC classification number: C25D13/14

Abstract: A method and apparatus provided for applying an electrocoat on the interior and exterior of a metal container simultaneously. The interior and exterior of a metal container may be either uniformly or differentially coated. An electrically conductive probe including a nozzle is inserted into a metal container and an electrically conductive housing is enclosed around the container to seal the container therein and to form a continuous passageway from the probe-nozzle to the outer housing. As flowing electrocoating material floods the container in a transient bath, an electrical potential is simultaneously impressed between the container and the probe-nozzle to electrocoat the interior of the container, and between the container and the outer housing to electrocoat the exterior of the container.

Abstract translation: 提供用于同时在金属容器的内部和外部施加电泳涂层的方法和装置。 金属容器的内部和外部可以均匀地或差异地涂覆。 将包括喷嘴的导电探针插入金属容器中，并且导电壳体围绕容器封闭以将容器密封在其中并形成从探针喷嘴到外壳体的连续通道。 当流动的电涂覆材料在瞬时浴中使容器淹没时，容器和探针 - 喷嘴之间同时地施加电势，以电泳涂覆容器的内部，以及在容器和外壳体之间电泳涂覆容器的外部。

公开(公告)号：US20180252686A1

公开(公告)日：2018-09-06

申请号：US15911111

申请日：2018-03-03

Applicant: DAVID A. SMITH

Inventor： Michael C. Trachtenberg ,  David A. Smith

IPC: G01N30/42 ,  B01D11/04 ,  B04B5/04 ,  A61M1/36

CPC classification number: G01N30/42 ,  A61M1/3696 ,  B01D11/0419 ,  B01D11/0423 ,  B01D11/048 ,  B01D11/0484 ,  B01J19/1831 ,  B01J19/1887 ,  B01J19/1893 ,  B01J19/243 ,  B01J19/247 ,  B01J19/2475 ,  B01J19/28 ,  B01J2219/00907 ,  B04B5/0428 ,  B04B5/0442 ,  B04B2005/0457

Abstract: We describe vortical thin layer film flow along a spiral channel designed to improve mass and heat transfer efficiency for a multitude of physicochemical reactions and processes. Spiral channels, commonly augmented by centrifugal rotation, support rapid reaction between one or more fluids in a given channel. Dean vortices generate screw-shaped patterns processing axially in the channel, repeatedly refreshing radial interfaces. Fluids self-align, self-assemble, stable, controllable, exhibit thin film geometry. Multiple discrete lamellae can flow with independent velocity separated by density and may be soluble or insoluble in one another. Membranes separating spirals allow other interactions. Energy can be provided and extracted from each flow. Flows can enter or exit independently along the channel length. The pressure within each channel is controlled even when operated at the liquid's vapor pressure. The device is scalable to include a multiplicity of flows in a multiplicity of centrifugally rotating chambers.

公开(公告)号：US08866870B1

公开(公告)日：2014-10-21

申请号：US13277786

申请日：2011-10-20

Applicant: David A. Smith

Inventor： David A. Smith

IPC: H04N7/15 ,  G06F17/00 ,  G05B15/00

CPC classification number: G06F3/041 ,  G06F3/0346

Abstract: A method, apparatus, and system for controlling from a first location a laser at a second location are disclosed. Laser orientation data is determined at a first location. The laser orientation data is communicated to the second location. Video data is received from the second location that includes imagery of a laser beam emitted by a laser, and the imagery is presented on a display at the first location.

Abstract translation: 公开了一种用于从第一位置控制在第二位置处的激光的方法，装置和系统。 在第一位置确定激光取向数据。 将激光取向数据传送到第二位置。 从包括由激光发射的激光束的图像的第二位置接收视频数据，并且将图像呈现在第一位置处的显示器上。