Level tools and level indicating devices for determining the angle of a vertically oriented object relative to both level and plumb capable of being read without requiring the tool's user to change his or her position or the position of the level tool.

To eliminate influences of unnecessary reflected light other than a liquid surface in a liquid surface reflection type inclination sensor. In order to attain the object described above, an inclination sensor includes a liquid that forms a liquid surface, an illumination section, a barcode pattern to be illuminated by the illumination section, an optical system that projects the barcode pattern on the liquid surface, a light receiving element that detects the barcode pattern, a storage section that stores a detection image when the liquid surface is removed from an optical path of the optical system, and an arithmetic section that calculates an inclination angle by subtracting the detection image when the liquid surface is removed from a detection image when the liquid surface is present on the optical path of the optical system.

To eliminate influences of unnecessary reflected light other than a liquid surface in a liquid surface reflection type inclination sensor. In order to attain the object described above, an inclination sensor includes a liquid that forms a liquid surface, an illumination section, a barcode pattern to be illuminated by the illumination section, an optical system that projects the barcode pattern on the liquid surface, a light receiving element that detects the barcode pattern, a storage section that stores a detection image when the liquid surface is removed from an optical path of the optical system, and an arithmetic section that calculates an inclination angle by subtracting the detection image when the liquid surface is removed from a detection image when the liquid surface is present on the optical path of the optical system.

A light fixture can include a housing and a sensor device having a sensor that measures at least one parameter associated with a position of the housing. The light fixture can also include a controller coupled to the sensor device. The controller can receive multiple measurements of the at least one parameter taken by the sensor device. The controller can also evaluate each measurement against at least one range of acceptable values. The controller can further send a notification when a measurement falls outside the at least one range of acceptable values. The notification can state that the housing is moved out of position and requires attention.

Provided is a tilt angle sensor. The tile angle sensor includes a first directional coupler, a second directional coupler, a reference single mode optical fiber, and a sensing single mode optical fiber. An output end of the first directional coupler is connected to a first end of the reference single mode optical fiber and a first end of the sensing single mode optical fiber. A second end of the reference single mode optical fiber and a second end of the sensing single mode optical fiber are connected to an input end of the second directional coupler. A groove having a depth less than or equal to a thickness of a wall of a cladding of the sensing single mode optical fiber is formed on the cladding. The groove is filled and sealed with two liquids of different densities and un-dissolvable with each other, and the two liquids form layers.

An angular speed acquisition device acquires the angular speed about a road surface perpendicular axis of a leaning vehicle. The leaning vehicle includes a vehicle body frame capable of leaning in a vehicle left-right direction and a steering shaft which steers at least one of a front wheel unit and a rear wheel unit. An angular speed acquisition device, which is mountable on the leaning vehicle, includes a memory and a processor. The memory stores the relationship between the steering angle, which is a rotation angle about the rotational axis of the steering shaft, the vehicle speed of the leaning vehicle, and the angular speed about the road surface perpendicular axis.

A carpenter square includes a body including a first, second, and third edges. A fence is pivoted to the first edge for movement among first, second, and third positions. In the first and second positions, the fence is normal to the body. In the third position, the fence is coplanar to the body. A hinge assembly pivots the fence to the body and includes a notch in the body, a recess in the notch, and a tab projecting from the fence and fit over the pin for reciprocating and swinging movement. The tab moves between a neutral stance, in which the tab is mis-registered with the recess and disables movement of the fence among the first, second, and third positions, and an advanced stance, in which the tab is registered with the recess and enables movement of the fence among the first, second, and third positions.

A carpenter square includes a body including a first, second, and third edges. A fence is pivoted to the first edge for movement among first, second, and third positions. In the first and second positions, the fence is normal to the body. In the third position, the fence is coplanar to the body. A hinge assembly pivots the fence to the body and includes a notch in the body, a recess in the notch, and a tab projecting from the fence and fit over the pin for reciprocating and swinging movement. The tab moves between a neutral stance, in which the tab is mis-registered with the recess and disables movement of the fence among the first, second, and third positions, and an advanced stance, in which the tab is registered with the recess and enables movement of the fence among the first, second, and third positions.

A work machine includes a body, a work implement, and a controller. The body includes a frame to which the work implement is attached, an operator's cab, and a plurality of liquid-sealed mounts that are installed at different positions of the frame and support the operator's cab. At least one of the plurality of liquid-sealed mounts includes a sensor that detects a liquid pressure of a sealed liquid. The controller calculates an inclination degree of the work machine with respect to a horizontal plane based on a result of the detection by the sensor.

A work machine includes a body, a work implement, and a controller. The body includes a frame to which the work implement is attached, an operator's cab, and a plurality of liquid-sealed mounts that are installed at different positions of the frame and support the operator's cab. At least one of the plurality of liquid-sealed mounts includes a sensor that detects a liquid pressure of a sealed liquid. The controller calculates an inclination degree of the work machine with respect to a horizontal plane based on a result of the detection by the sensor.