公开(公告)号：US4396126A

公开(公告)日：1983-08-02

申请号：US209654

申请日：1980-11-24

申请人： David Moravec ,  Lembit Vaerk

发明人： David Moravec ,  Lembit Vaerk

IPC分类号： B66C23/687 ,  B66C23/70 ,  B66C23/04

CPC分类号： B66C23/706

摘要： Apparatus and method for extending a fly section of a telescopic crane boom which fly section does not have its own power extension/retraction unit. The crane boom comprises at least a first or fly section, a second section, and a third or base section. Linearly extendable power screws are located within the boom for extending the second section from the base section, being connected between the base section and the second section to effect movement of the latter. To set up the crane for operation, the power screws extend the second section from the base section, a load pin connecting the fly section and the second section is released, and a pair of stop pins engages the fly section in its sides. The stop pins prevent movement of the fly section relative to the base section. Thus, when the second section is thereafter retracted into the base section, the fly section is left extended from the second section. A hole at the inside of the fly section and the load pin are at this point in alignment and the load pin may be inserted to engage both sections. The power screws are now in readiness to independently operate the second section, with the fly section fully extended on the second section.

摘要翻译： 用于延伸伸缩起重机吊臂的飞行部分的装置和方法，其中飞行部分没有其自己的功率延伸/收回单元。 起重机吊臂至少包括第一或飞行部分，第二部分以及第三或基部。 线性可伸缩动力螺钉位于起重臂内，用于从基部延伸第二部分，连接在基部和第二部分之间，以实现后者的移动。 为了设置起重机进行操作，动力螺钉从基部延伸第二部分，释放连接飞行部分和第二部分的负载销，并且一对止动销与其两侧的飞行部分接合。 止动销防止飞行部分相对于基部的运动。 因此，当第二部分此后缩回到基部时，飞行部分从第二部分延伸。 在飞行部分的内侧的孔和负载销在该位置处于对准位置，并且可以插入负载销以接合两个部分。 电动螺钉现在已经准备好独立地操作第二部分，而飞行部分在第二部分完全伸展。

公开(公告)号：US4337601A

公开(公告)日：1982-07-06

申请号：US143496

申请日：1980-04-24

申请人： Lembit Vaerk ,  Narahari Gattu

发明人： Lembit Vaerk ,  Narahari Gattu

IPC分类号： B66C23/697 ,  B66C23/70 ,  B66C23/06

CPC分类号： B66C23/701 ,  B66C23/705 ,  B66C23/707

摘要： A high-strength light-weight hollow boom section for a multi-section telescopic crane boom comprises a top wall, a bottom wall, and a pair of lateral walls, each lateral wall being located between the top wall and the bottom wall. Each of the four walls comprises a pair of spaced apart longitudinally extending members, a relatively thin plate extending between, overlapping and welded to the pair of longitudinal members, and a plurality of longitudinally spaced part transversely extending stiffeners of U-shaped cross-sections, each stiffener being welded to the plate and to the pair of longitudinal members. Each longitudinal member of a lateral wall is in edge-wise abutting relationship with and welded to the surface of a longitudinal member of one of the top and bottom walls. Each stiffener of a lateral wall also has its ends in abutting relationship with and welded to the surface of a longitudinal member of the top and bottom walls. Novel slide pad arrangements are also disclosed.

摘要翻译： 用于多段伸缩起重机吊臂的高强度轻型空心悬臂部分包括顶壁，底壁和一对侧壁，每个侧壁位于顶壁和底壁之间。 四个壁中的每一个包括一对间隔开的纵向延伸的构件，在该一对纵向构件之间延伸并重叠并焊接到该一对纵向构件的相对薄的板，以及多个纵向间隔的部分，横向延伸的U形横截面的加强件， 每个加强件焊接到板和一对纵向构件。 侧壁的每个纵向构件与顶壁和底壁中的一个的纵向构件的表面处于边缘邻接关系并且焊接到其纵向构件的表面。 侧壁的每个加强件也具有与顶壁和底壁的纵向构件的表面邻接并焊接到其表​​面的端部。 还公开了新颖的滑动垫布置。

公开(公告)号：US4112649A

公开(公告)日：1978-09-12

申请号：US827871

申请日：1977-08-26

申请人： Robert A. Fritsch ,  Narahari Gattu ,  Lembit Vaerk

发明人： Robert A. Fritsch ,  Narahari Gattu ,  Lembit Vaerk

IPC分类号： B66C23/687 ,  B66C23/70 ,  E04C3/04 ,  E04H12/34

CPC分类号： B66C23/701 ,  B66C23/707

摘要： A large light-weight deflection-resistant telescopic boom section of hollow rectangular cross-section comprises spaced apart top and bottom plates and spaced apart vertical side plates welded therebetween inwardly of the side edges thereof. Longitudinal corner stiffeners of angular cross-section are welded between the outwardly extending portion of the top and bottom plates and the associated vertical side plate to shorten the effective height of the side plate, to stiffen the top and bottom plates, to increase the mechanical section properties, and to provide a flat built-in slide pad bearing surface. Vertical side stiffeners of U-shaped cross-section are welded to the vertical side plates at intervals therealong and to the longitudinal corner stiffeners to provide the buckling resistance and increased shear load capacity of side plates.

公开(公告)号：US4653655A

公开(公告)日：1987-03-31

申请号：US812336

申请日：1985-12-23

申请人： Ram N. Rathi ,  Lembit Vaerk

发明人： Ram N. Rathi ,  Lembit Vaerk

IPC分类号： B66C23/42 ,  B66C23/68 ,  B66C23/70

CPC分类号： B66C23/702

摘要： A mobile crane having a boom and a boom extension connected thereto with a toggle linkage for connecting the boom extension to the boom to allow the boom extension to be offset from the boom by one of a plurality of predetermined angles. A pair of double links is pivotably attached to the boom extension while a pair of single links is pivotably attached to the upper sheave pin in the boom head. Both the single and double links have a hole in the opposite end. Either the single or double links also have a hole in at least one intermediate position. The link having one hole is then pinned to the other link having two holes, the hole selected in the second link determining the angles of offset when tension is applied to the linkage by pivoting the boom extension about the lower sheave pin after removal of the upper boom foot pins. Biasing devices are provided to cause the linkage, which pivots freely at both ends and in the middle, to toggle upward when tension thereon is released. A storage position is provided for storing the double links and the link connector pins so as to prevent interference with the other apparatus and loss of the connector pins when the linkage is not in use.

摘要翻译： 一种具有悬臂和悬臂延伸部的移动式起重机，所述起重臂延伸部具有肘节连接件，用于将所述起重臂延伸部连接到所述起重臂，以允许所述起重臂延伸部通过多个预定角度中的一个偏离所述起重臂。 一对双连杆可枢转地连接到悬臂延伸部，而一对单连杆可枢转地连接到悬臂头部中的上滑轮销。 单链和双链都有相反的一个孔。 单个或双向链节中的至少一个中间位置也具有孔。 具有一个孔的连杆然后被固定到具有两个孔的另一个连杆上，在第二连杆中选择的孔通过在移除上部上部之后枢转吊臂延伸部围绕下滑轮销钉枢转来确定张力时施加的作用力来确定偏移角度 吊臂脚针。 设置有偏压装置，以使得在其两端和中间自由枢转的连杆在张力被释放时向上转动。 提供存储位置用于存储双连杆和连杆连接器销，以防止在不使用连杆时与其他装置的干扰和连接器销的损失。