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    Compass housing
    1.
    发明授权
    Compass housing 失效
    指南针外壳

    公开(公告)号：US4156313A

    公开(公告)日：1979-05-29

    申请号：US899948

    申请日：1978-04-25

    申请人： Axel Lied

    发明人： Axel Lied

    IPC分类号： B43L9/20 ,  B43L9/02

    CPC分类号： B43L9/20

    摘要： A compass housing of the type used for supporting a pair of adjustable compass legs in resilient contact with a spring clip. The housing includes a transverse cross-shaft as a bearing for the upper ends of the compass legs and an elongated rib, upraised to define a fulcrum for the spring clip. The housing is characterized by its unitary construction.

    摘要翻译： 用于支撑与弹簧夹弹性接触的一对可调罗经腿的类型的罗盘外壳。 壳体包括作为罗盘腿的上端的轴承的横向横轴和细长的肋，其被提升以限定弹簧夹的支点。 房屋的特点是其一体化建筑。

    Drawing instrument
    2.
    发明授权
    Drawing instrument 失效
    绘图仪器

    公开(公告)号：US4146965A

    公开(公告)日：1979-04-03

    申请号：US817103

    申请日：1977-07-19

    申请人： Raymond A. Payton

    发明人： Raymond A. Payton

    IPC分类号： B43L9/20 ,  B43L9/24 ,  B43L9/02

    CPC分类号： B43L9/24 ,  B43L9/20

    摘要： A drawing instrument comprises a pair of die-cast limbs pivotally connected together to form an assembly at the inner ends thereof. A bow top has an interior hole and fork limbs having inside faces embracing the assembly of the ends. A centralizing member is held between the inner ends of the pivoted die-cast limbs. The centralizing member includes an elongated pivot receiving hole and first and second keying poles. A first die-cast keying projection is integrally formed at the inner end of a first one of the pivoted die-cast limbs. A first arcuate slot is provided in the inner end of the first pivoted die-cast limb. A second die-cast keying projection is integrally formed at the inner end of the second one of the pivoted die-cast limbs. A second arcuate slot is disposed in the inner end of the second pivoted die-cast limb. The first and second die-cast keying projections engage the second and first arcuate slots, respectively. The first and second die-cast keying projections engage the first and second keying holes in the centralizing member to key the centralizing member to the inner ends of the pivoted die-cast limbs. The centralizing member has a structural configuration to project up into the interior hole of the bow top and is further effective to press against a side wall of the interior hole when there is angular movement of one of the pivoted limbs with respect to the other pivoted limb. Consequently, the structural configuration of the centralizing member causes the bow top to turn and keep central. Stop means engageable with the inner ends of the pivoted limbs are effective to act against the angular opening out movement of the pivotal limbs beyond a predetermined angular limit. Thus, the two die-cast projections cannot bear against the ends of the respective arcuate recesses or slots before the stop means on the bow top bear against the inner ends of the die-cast limbs. BACKGROUND OF THE INVENTION

    摘要翻译： 拉伸仪器包括一对压铸四肢，其可枢转地连接在一起，以在其内端形成组件。 弓形顶部具有内部孔和叉形肢体，其具有包围端部的组件的内侧面。 中心构件保持在枢转的压铸四肢的内端之间。 集中构件包括细长的枢轴接收孔和第一和第二键控极。 第一压铸密封突起一体地形成在第一个旋转压铸肢体的内端。 第一弧形狭槽设置在第一枢转压铸肢体的内端。 第二压铸键合突起一体地形成在第二个旋转压铸臂的内端。 第二弧形槽设置在第二枢转压铸肢体的内端中。 第一和第二压铸键控突起分别接合第二和第一弧形槽。 第一和第二压铸键合突起接合中心构件中的第一和第二键槽，以将集中构件键合到枢转的压铸四肢的内端。 集中构件具有突出到弓形顶部的内部孔中的结构构造，并且当枢转的四肢中的一个相对于另一个枢转的肢体有角度运动时，进一步有效地压靠内部孔的侧壁 。 因此，集中构件的结构构造使弓顶转动并保持中心。 能够与枢转的四肢的内端接合的止动装置有效地抵抗枢转臂的角度开度的运动超过预定的角度限制。 因此，在弓形顶部的止动装置抵靠压铸四肢的内端之前，两个压铸突起不能承受相应弓形凹槽或槽的端部。