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公开(公告)号：US6124652A
公开(公告)日：2000-09-26
申请号：US315913
申请日：1999-05-20
摘要： A power tool has a mechanism to reverse a motor. The mechanism includes a first member secured with the motor surrounding the motor commutator. A pair of electrical contacts are supported in the first member. A second member is rotatable on the fist member. The second member carries a pair of brush holders which include electrical contacts. As the second member is rotated in the first member, the electrical contacts of the brush holders, as well as the electrical contacts in the first member, electrically couple with one another from a first position to a second position which relates to a forward and reverse direction of the motor. A lever moves the second member between its first and second positions.
摘要翻译： 电动工具具有使电机反转的机构。 该机构包括用围绕电动机换向器的马达固定的第一构件。 一对电触点支撑在第一构件中。 第二构件可在第一构件上旋转。 第二构件携带包括电触头的一对刷持器。 当第二构件在第一构件中旋转时，电刷架的电触点以及第一构件中的电触点彼此电耦合从第一位置到第二位置，其涉及正向和反向 电机方向。 杠杆使第二构件在其第一和第二位置之间移动。
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公开(公告)号：US5580302A
公开(公告)日：1996-12-03
申请号：US203131
申请日：1994-02-28
摘要： An air directing baffle for a random orbit sander. The baffle includes a main body portion forming an annular opening, a pair of neck portions extending approximately circumferentially opposite from one another, and a pair of recessed portions formed in each of the neck portions. The neck portions extend into airflow registration with a plurality of exhaust slots formed in a shroud rotatably disposed at a lower portion of a housing of the sander. The annular opening is adapted to fit over a boss portion protruding from a lower face surface of the housing of the sander to thus permit the baffle to be rotated freely relative to the housing. The recessed portions in each of the neck portions of the baffle inwardly engage with a pair of inwardly protruding shoulder portions formed in an interior area of the shroud. The interengagement of the baffle with the shroud permits the neck portions of the baffle to be maintained in alignment with the exhaust slots in the shroud as the shroud is rotated by a user during operation of the sander. Thus, the baffle is free to rotate relative to the housing but not relative to the shroud itself. The baffle serves to more effectively direct a cooling airflow drawn in by a fan through inlet slots in a top member associated with the housing such that the airflow is more directly exhausted from the interior area of the shroud. The design of the baffle further does not complicate the assembly of the sander 10 or otherwise add significantly to the overall cost of the sander.
摘要翻译： 用于随机轨道砂光机的导风挡板。 挡板包括形成环形开口的主体部分，大致周向相对延伸的一对颈部部分和形成在每个颈部部分中的一对凹部。 颈部延伸成与形成在可旋转地设置在砂光机的壳体的下部的护罩中的多个排气槽的气流对准。 环形开口适于装配在从砂光机的壳体的下表面突出的凸台部分上，从而允许挡板相对于壳体自由旋转。 挡板的每个颈部中的凹部向内接合形成在护罩的内部区域中的一对向内突出的肩部。 挡板与护罩的相互接合允许挡板的颈部保持与护罩中的排气槽对准，因为在砂光机操作期间护罩由使用者旋转。 因此，挡板相对于壳体自由旋转，但不相对于护罩本身旋转。 挡板用于更有效地引导由风扇吸入的冷却气流通过与壳体相关联的顶部构件中的入口狭槽，使得气流从罩的内部区域更直接地排出。 挡板的设计进一步不使砂磨机10的组装复杂化，或者明显地增加了砂磨机的整体成本。
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公开(公告)号：US5392568A
公开(公告)日：1995-02-28
申请号：US173644
申请日：1993-12-22
摘要： A random orbit sander having a braking member for frictionally controlling the speed of a platen of the sander when the sander is removed from a workpiece during operation. The braking member includes a base portion, an outwardly flaring, relatively thin wall portion and an enlarged outermost edge portion adapted to frictionally engage an upper surface of the platen. The braking member is secured to the bottom of the shroud of the housing via a groove formed in its base portion. The braking member exerts a relatively constant spring force against the upper surface of the platen which limits the rotational speed of the platen to approximately 1200 rpm when the platen is lifted off of a work surface, without significantly degrading the performance of the sander under load. This prevents swirl marks and other undesirable scratches from being made in a workpiece when the platen is reapplied to the workpiece as a result of the platen having increased in speed to an unloaded, free-wheeling speed, and yet allows the platen to operate at or above the minimum desired working speed of about 800 rpm. The braking member is formed from polyester butylene terephthalate which is doped with approximately 2% silicon and approximately 15% teflon in the preferred embodiments. This material formulation, plus its geometry, allows the braking member to exert and maintain a relatively constant spring force of about 3.5 lbs. against the platen and to resist frictional wear once past an initial break-in period. The braking member also acts as a seal between the lower surface of the shroud and the upper surface of the platen.
摘要翻译： 一种随机轨道打磨机，其具有制动部件，用于当在操作期间从工件移除砂磨机时摩擦地控制砂光机的压板的速度。 制动构件包括基部，向外扩张的相对薄的壁部分和适于摩擦地接合压板的上表面的扩大的最外边缘部分。 制动构件通过形成在其基部中的凹槽固定到壳体的护罩的底部。 当压板从工作表面离开时，制动构件对压板的上表面施加相对恒定的弹簧力，其将压板的旋转速度限制在大约1200rpm，而不会显着降低砂轮在负载下的性能。 当压板由于压板的速度增加到无负载的续流速度而使压板在或重新施加在工作台上时，这可防止在工件上产生涡流痕迹和其它不期望的划痕， 高于约800rpm的最小期望工作速度。 在优选实施例中，制动构件由聚对苯二甲酸丁二醇酯形成，其掺杂有约2％的硅和约15％的特氟隆。 该材料配方以及其几何形状允许制动构件施加并保持约3.5磅的相对恒定的弹簧力。 抵抗压板并抵抗摩擦磨损一旦超过初始的入场期。 制动构件还用作护罩的下表面和压板的上表面之间的密封。
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公开(公告)号：US4265018A
公开(公告)日：1981-05-05
申请号：US934746
申请日：1978-08-21
IPC分类号： A01D34/416 , A01D34/73 , A01D35/00 , A01D50/00
CPC分类号： A01D34/4168 , A01D34/73
摘要： A portable, cordless, electrically energized grass trimming device is disclosed having a rotary cutter blade which is formed of a flexible strip of material and which is mounted for rotation over a predetermined course. A blade stabilizing means is provided for restraining the blade along a segment of its length for maintaining rotary motion of the blade in the predetermined course upon impact with other objects. The flexibility of the blade is enhanced by mounting the blade for rotation over a course described by a curved surface of revolution and blade durability is improved by providing a means for absorbing impact shock when the blade strikes an object. An improved blade is described having integrally formed resilient means for absorbing the shock of impact.
摘要翻译： 公开了一种便携式，无绳电动通电的草地修剪装置，其具有旋转切割刀片，旋转切割刀片由柔性条带形成，并且安装成在预定的路线上旋转。 提供了一种叶片稳定装置，用于沿其长度的段限制叶片，以在与其它物体碰撞时保持叶片在预定过程中的旋转运动。 通过将旋转刀片安装在旋转弯曲表面所描述的路线上来提高刀片的灵活性，通过提供一种用于当刀片撞击物体时吸收冲击冲击的装置来改善刀片耐久性。 描述了一种改进的叶片，其具有用于吸收冲击冲击的整体形成的弹性装置。
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公开(公告)号：US4249310A
公开(公告)日：1981-02-10
申请号：US934745
申请日：1978-08-21
CPC分类号： A01D34/73 , A01D34/4165 , A01D34/90 , A01D75/18
摘要： A means is described for restraining axial movement of an output shaft of a prime mover which protects the prime mover from undesired axial impact loads applied thereto. The protective means comprises a first body mounted to a rotating output shaft for motion in an axial direction upon the application of a thrust force to the body and a second body which is stationary relative to the output shaft. Means bias the bodies apart and enables mutual engagement therebetween which restricts movement between the bodies in an axial direction when an impact force is applied to the first body.
摘要翻译： 描述了一种用于抑制原动机的输出轴的轴向运动的装置，其保护原动机免受施加到其上的不期望的轴向冲击负载。 保护装置包括：第一主体，其安装到旋转输出轴，用于在向主体施加推力时在轴向方向上运动，第二主体相对于输出轴静止。 装置将物体分开并使其间的相互接合限制当冲击力施加到第一体时在轴向方向上的主体之间的运动。
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公开(公告)号：US4237610A
公开(公告)日：1980-12-09
申请号：US934744
申请日：1978-08-21
IPC分类号： A01D34/416 , A01D35/26 , A01D55/18
CPC分类号： A01D34/416 , A01D34/4166 , A01D34/733
摘要： A portable, electrically energized, cordless grass trimmer device is disclosed having a rotatable hub which is adapted to alternatively mount, for substantially balanced rotation therewith, a flexible cutter strip and a line cutter and mechanical counterbalance.
摘要翻译： 公开了一种便携式，电能充电的无绳草修剪装置，其具有可旋转的毂，其适于交替地安装用于与其大致平衡的旋转，柔性切割条和线切割器以及机械平衡。
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公开(公告)号：US5955802A
公开(公告)日：1999-09-21
申请号：US994172
申请日：1997-12-19
摘要： A power tool has a mechanism to reverse a motor. The mechanism includes a first member secured with the motor surrounding the motor commutator. A pair of electrical contacts are supported in the first member. A second member is rotatable on the fist member. The second member carries a pair of brush holders which include electrical contacts. As the second member is rotated in the first member, the electrical contacts of the brush holders, as well as the electrical contacts in the first member, electrically couple with one another from a first position to a second position which relates to a forward and reverse direction of the motor. A lever moves the second member between its first and second positions.
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