公开(公告)号：US4170824A

公开(公告)日：1979-10-16

申请号：US845894

申请日：1977-10-27

申请人： Tom T. Mikulin

发明人： Tom T. Mikulin

IPC分类号： B43L9/02 ,  B43L11/00 ,  B43L11/04

CPC分类号： B43L11/00 ,  B43L9/02

摘要： A compass for drawing geometric figures including ellipses and polygons of different sizes and shapes. The compass includes an upstanding center post having a lower point which supports the compass on the drawing surface. A disc forming a peripheral cam track is detachably mounted on a holder which in turn is pivotally mounted on a medial portion of the post. The disc is connected with a plunger which is slidable in the post for selectively adjusting the angle of the disc. A head member is rotatably mounted on an upper portion of the post. An adjustable multiplier link carrying a marking element is pivotally mounted at its upper end to the head member at a point which is radially spaced from the post a distance greater than the maximum radius of the cam track. In one embodiment a cam follower is suspended from the head member by a parallelogram linkage, and spring means is provided to urge the roller into contact with the cam track. In another embodiment the cam follower comprises a ring which turns in positive engagement about the disc, with stabilizer fingers being mounted to turn about the post. An alternate stylus arm is mounted below the cam follower for use in drawing figures of short radii. In both embodiments disc can be detached from its holder for replacement with parts having a varied cam track for drawing a different geometric figure.

摘要翻译： 绘制几何图形的罗盘，包括不同大小和形状的椭圆和多边形。 指南针包括一个直立的中心柱，其具有支撑图面上的罗盘的较低点。 形成周边凸轮轨道的盘可拆卸地安装在保持器上，该保持器又枢转地安装在柱的中间部分上。 盘与可在柱中滑动以便有选择地调节盘的角度的柱塞连接。 头部构件可旋转地安装在柱的上部。 承载标记元件的可调节乘法器连接件在其上端枢转地安装到头部构件上，该位置与柱体径向间隔大于凸轮轨道的最大半径的距离。 在一个实施例中，凸轮从动件通过平行四边形连杆从头部构件悬挂，并且提供弹簧装置以推动辊与凸轮轨道接触。 在另一个实施例中，凸轮从动件包括环绕盘旋转的环，其中稳定器指状件被安装成围绕柱转动。 一个替代的触针臂安装在凸轮从动件的下方，用于绘制短半径的图形。 在两个实施例中，盘可以从其保持器拆下以用于具有用于绘制不同几何图形的变化的凸轮轨道的部件替换。

公开(公告)号：US4174572A

公开(公告)日：1979-11-20

申请号：US918801

申请日：1978-06-26

申请人： Tom T. Mikulin

发明人： Tom T. Mikulin

IPC分类号： B43L11/04

CPC分类号： B43L11/04

摘要： A drafting instrument for tracing curves such as ellipses. The instrument includes a base which is movable over a graphics surface. A marking element is carried by a writing arm connected with the base by linkage means which guides the marking element along a predetermined curvilinear path. The linkage means includes a master arm pivotally mounted at one end on the base for sliding movement along the minor axis and pivotally mounted at its other end on the writing arm by an articulated joint which is adjustable along the writing arm to selectively vary the minor axis apex of the curve being drawn. The linkage means also includes a slave arm pivotally mounted between the base and a midportion of the master arm. Another articulated joint is mounted on the base for sliding movement along the minor axis and is adjustably connected with the writing arm for selectively varying the major axis apex of the curve being drawn. A handle and yoke arrangement is provided for normally holding the marking element in a raised stand-by position and causing the marking element to move downwardly into contact with the graphics surface as a force is applied to the handle for operating the instrument.

摘要翻译： 用于跟踪曲线的绘图仪器，例如椭圆。 仪器包括可在图形表面上移动的基座。 标记元件由通过连接装置与基座连接的书写臂承载，该连接装置沿着预定的曲线路径引导标记元件。 联动装置包括主臂，其一端枢转地安装在基座上，用于沿着短轴滑动运动，并且其另一端在书写臂上通过可沿书写臂可调节的铰接接头枢转地安装，以选择性地改变短轴 绘制曲线的顶点。 连接装置还包括一个可枢转地安装在基座与主臂的中间部分之间的从动臂。 另一个铰接接头安装在基座上，用于沿着短轴滑动运动，并可与书写臂可调节地连接，以选择性地改变被拉伸的曲线的长轴顶点。 提供手柄和轭架装置，用于将标记元件正常地保持在升高的备用位置，并且当力施加到手柄以操作器械时，使标记元件向下移动以与图形表面接触。