A wire pulling windier apparatus attachable to a tractor, loader or other mobile transport device capable of receiving attachments has a pass through frame attachable to the mobile device, a vertical support member on the frame for supporting a first winch with cable for attaching and pulling a fence wire to be tensioned, a second winch for raising and lowering a slide block assembly through which the first winch cable is guided to allow pulling the first winch cable at different vertical heights, and has winch tension limiting apparatus.

An automatic method for determining a physical end-of-travel position (zphys) of a reeve-block of a crane which may be moved in ascent and in descent by means of a lifting cable comprises a phase of ascent of the reeve-block during which a force on a strand of the lifting cable is monitored by a monitoring device, which may be a load sensor such as a gauge pin. The physical end-of-travel position is reached and determined depending a variation of the force on the strand of the lifting cable. From this physical end-of-travel position, a maximum end-of-travel position (zmax) may be determined in particular, which is a position not to be exceeded by the reeve-block when the crane is working.

An automatic method for determining a physical end-of-travel position (zphys) of a reeve-block of a crane which may be moved in ascent and in descent by means of a lifting cable comprises a phase of ascent of the reeve-block during which a force on a strand of the lifting cable is monitored by a monitoring device, which may be a load sensor such as a gauge pin. The physical end-of-travel position is reached and determined depending a variation of the force on the strand of the lifting cable. From this physical end-of-travel position, a maximum end-of-travel position (zmax) may be determined in particular, which is a position not to be exceeded by the reeve-block when the crane is working.

The present specification provides a device and method for controlling a winch parcel delivery system through an uncrewed aerial vehicle (UAV) or drone. The example apparatus contemplates the use of a winch that will attach to a hook with active and passive release mechanisms through a winch line. The apparatus is enabled to attach to a parachute recovery system. The apparatus can detect when the ground has been reached to enable safe delivery of parcels. The apparatus can removably attach to various types of drones.

A winch having a rope and a rigid member coupled, at a first end portion of the rope, to the rope. The rigid member is coupleable to a load raisable and/or lowerable by the winch, where the rigid member is configured to substantially increase an effective length of the load to stabilize the load when being raised and/or lowered by the winch.

A rope hoist includes: a rope drum around which a wire rope W is wound; a support shaft and a limit switch bolt arranged to be parallel to the rope drum; limit switch mechanisms; and a rope guide mechanism moving in accordance with a winding state of the wire rope W, and making the limit switch mechanisms perform on/off operation. Each of the limit switch mechanisms includes: a limit switch metal fitting into which both of the support shaft and the limit switch bolt are inserted, in which the limit switch metal fitting is sandwiched and fixed by nuts from both sides thereof in an axial direction of the limit switch bolt.

A rope hoist includes: a rope drum around which a wire rope W is wound; a support shaft and a limit switch bolt arranged to be parallel to the rope drum; limit switch mechanisms; and a rope guide mechanism moving in accordance with a winding state of the wire rope W, and making the limit switch mechanisms perform on/off operation. Each of the limit switch mechanisms includes: a limit switch metal fitting into which both of the support shaft and the limit switch bolt are inserted, in which the limit switch metal fitting is sandwiched and fixed by nuts from both sides thereof in an axial direction of the limit switch bolt.

A cross-type limit switch (10) with a housing (12) that contains a gear mechanism (24) that includes a cover plate (38), base plate (48), and intermediate plate (42). The intermediate plate (42) has first and second cutouts (44, 46) within which respective gearwheels (54, 58) are arranged. The first and second gear wheels (54, 58) have respective plugthrough openings (56, 60), and a shaft (20) coupled to an actuating lever (18) outside the housing is rotatably mounted in a first bearing arrangement (22) connected to the housing. The actuating lever shaft (20) extends through the first plugthrough opening (56) of the first gear wheel (54) for rotating and radially locating the first gear wheel (54). A rotary switch (30) arranged in the housing (12) has a switch shaft (138) rotatably mounted in a second bearing arrangement (106, 34) that extend through the second plugthrough opening (60) of the second gearwheel for rotating and radially locating the second gearwheel (58).

A cross-type limit switch (10) with a housing (12) that contains a gear mechanism (24) that includes a cover plate (38), base plate (48), and intermediate plate (42). The intermediate plate (42) has first and second cutouts (44, 46) within which respective gearwheels (54, 58) are arranged. The first and second gear wheels (54, 58) have respective plugthrough openings (56, 60), and a shaft (20) coupled to an actuating lever (18) outside the housing is rotatably mounted in a first bearing arrangement (22) connected to the housing. The actuating lever shaft (20) extends through the first plugthrough opening (56) of the first gear wheel (54) for rotating and radially locating the first gear wheel (54). A rotary switch (30) arranged in the housing (12) has a switch shaft (138) rotatably mounted in a second bearing arrangement (106, 34) that extend through the second plugthrough opening (60) of the second gearwheel for rotating and radially locating the second gearwheel (58).

A hoist comprising: an upper hook; a support shaft that includes a hook-side large-diameter portion inserted through an insertion hole of the hook at a center portion, end large-diameter portions at both ends, an intermediate portion between the hook-side large-diameter portion and the end large-diameter portion, and a strain deformation portion that is provided at the intermediate portion; a main frame that includes a pair of support holes and is suspended and supported by the upper hook via the support shaft with the end large-diameter portion on one side inserted in the one support hole and the end large-diameter portion on the other side inserted in the other support hole; and a load measurement means that is attached to the strain deformation portion and measures a shear load acting on the strain deformation portion, wherein at least a portion of the intermediate portion is inserted in the support hole.