The invention relates to an elevator guide rail straightness measuring system, for measuring the straightness of elevator guide rails, which measuring system comprises at least one plumb line mounted vertically in the runway adjacent to the guide rail and at least one sensor arrangement to be mounted on a carrier to travel vertically along the guide rail, which sensor arrangement comprises a frame, at least one guide shoe connected to the frame for sliding/rolling along a guide surface of the guide rail, a bias means for placing and biasing the frame against the guide surface, and at least one sensor means for sensing the position of the plumb line with respect to the frame, such elevator system allows easy and exact measurement of the guide rail straightness. The invention also relates to an elevator having such a system.

A laser-level glasses device is provided. The device is comprised of a pair of glasses with an integrated auto-leveling laser. The laser projects one-axis or two-axis laser lines to produce vertical, horizontal, or perpendicular laser lines onto a surface.

A system for assisting in guiding of an aircraft maneuvered by an aircraft tractor on the ground, the system including at least one projection device including a laser generating a laser beam fixed to an anchor point of the fuselage of the aircraft. A fixing mechanism is configured to fix the projection device to an anchor point of the fuselage, the laser beam from each laser projector then plotting a light trace on the ground to be used to assist in guiding the aircraft on the ground. A camera can film the light trace on the ground. A remote display device includes a screen, the display device being positioned on the aircraft tractor for the screen to be visible to an operator of the aircraft tractor, each projection device being connected to the display device, the display device being configured to display the image from each projection device camera.

A top mounted column placement element includes a plumb bob hanging element to allow a plumb bob to hang from the top mounted column placement element and identify a corresponding portion of a bottom mounted column placement element. The top mounted column placement element defines a column perimeter. The bottom mounted column placement element also defines a column perimeter. Once the top mounted column placement portion and bottom mounted column placement element are in place, the column can be placed and set to conform to both defined column perimeters, ensuring the column is properly positioned.

A top mounted column placement element includes a plumb bob hanging element to allow a plumb bob to hang from the top mounted column placement element and identify a corresponding portion of a bottom mounted column placement element. The top mounted column placement element defines a column perimeter. The bottom mounted column placement element also defines a column perimeter. Once the top mounted column placement portion and bottom mounted column placement element are in place, the column can be placed and set to conform to both defined column perimeters, ensuring the column is properly positioned.

The invention provides a surveying instrument, which comprises a surveying instrument main unit having a machine reference point already known, a telescope unit installed on the surveying instrument main unit and for sighting a measuring point, a leveling unit for leveling the surveying instrument main unit, a laser pointer projecting unit for projecting a laser pointer beam in a downward direction along a vertical axis of the surveying instrument main unit and for performing distance measurement, a rotation driving unit for rotating the telescope unit in a direction as desired, a horizontal angle detecting unit for detecting a horizontal angle of the surveying instrument, main unit, a vertical angle detecting unit for detecting a vertical angle of the telescope unit, a tilt angle detecting unit for detecting a tilt angle of the surveying instrument main unit, and a control device, wherein the control device calculates relative space coordinates of the machine reference point of the surveying instrument main unit with respect to a projecting point of the laser pointer beam based on a distance measurement value obtained by the laser pointer projecting unit and on a tilt angle at the time of distance measurement.

A plumb bob assembly includes a vertical bar that includes an upper end and a lower end. The plumb bob assembly further includes a plumb bob coupled to the lower end of the vertical bar. The plumb bob assembly further includes a cross plate coupled to the vertical bar. The cross plate is located near the upper end and extends perpendicularly across the vertical bar. The cross plate includes a front end and a back end. The plumb bob assembly also includes a pair of horizontal reference plates. Each horizontal reference plate includes a reference end, each of the reference ends are configured to align with the front end or the back end of the cross plate.

A plumb bob assembly includes a vertical bar that includes an upper end and a lower end. The plumb bob assembly further includes a plumb bob coupled to the lower end of the vertical bar. The plumb bob assembly further includes a cross plate coupled to the vertical bar. The cross plate is located near the upper end and extends perpendicularly across the vertical bar. The cross plate includes a front end and a back end. The plumb bob assembly also includes a pair of horizontal reference plates. Each horizontal reference plate includes a reference end, each of the reference ends are configured to align with the front end or the back end of the cross plate.

A method for installing a component of an elevator system having an elevator shaft involves the steps of: mounting a positioning frame in the elevator shaft in relation to a wall of the elevator shaft; attaching a guide line in the elevator shaft separately from the positioning frame; aligning the guide line using the positioning frame; and aligning the component using the aligned guide line. A device for carrying out the method includes the guide line, the positioning frame having positioning aids for the guide line and an adjustable fastener for attaching the guide line in the elevator shaft.

A method for installing a component of an elevator system having an elevator shaft involves the steps of: mounting a positioning frame in the elevator shaft in relation to a wall of the elevator shaft; attaching a guide line in the elevator shaft separately from the positioning frame; aligning the guide line using the positioning frame; and aligning the component using the aligned guide line. A device for carrying out the method includes the guide line, the positioning frame having positioning aids for the guide line and an adjustable fastener for attaching the guide line in the elevator shaft.