There is provided a linear displacement measuring apparatus which notifies a user when being installed defectively. A slider includes a traveling body which travels along a main scale on the main scale, a carriage part mounted on an object, and coupling means which couples the traveling body with the carriage part. The coupling means allows relative displacement between the traveling body and the carriage part and biases the traveling body towards the main scale. The coupling means has a connecting rod arranged so as to couple the traveling body with the carriage part via a ball joint. The slider further has misalignment detecting means which detects that the relative displacement between the traveling body and the carriage part exceeds a prescribed allowable range. The misalignment detecting means is a pair of projecting pieces arranged in a vicinity of the connecting rod so that the displacement of the connecting rod is regulated within a predetermined range.

An apparatus for facilitating the rapid mounting of fence boards to fence posts includes a rail having a tongue projecting perpendicularly from one end thereof; and a board support assembly slidably disposed on the rail, the board support assembly including a carriage slidably mounted on the rail, a carriage lock for selectively fixing the carriage at a desired location along the rail, and a hook depending from the carriage below the tongue for temporarily supporting one end of a board to be mounted to a post. The subject apparatus may be hung from a first fence board by the tongue and then used to support an end of a second fence board within the cradle a desired distance below, and in substantially coplanar alignment with, the first board for mounting to a post.

An apparatus for facilitating the rapid mounting of fence boards to fence posts includes a rail having a tongue projecting perpendicularly from one end thereof; and a board support assembly slidably disposed on the rail, the board support assembly including a carriage slidably mounted on the rail, a carriage lock for selectively fixing the carriage at a desired location along the rail, and a hook depending from the carriage below the tongue for temporarily supporting one end of a board to be mounted to a post. The subject apparatus may be hung from a first fence board by the tongue and then used to support an end of a second fence board within the cradle a desired distance below, and in substantially coplanar alignment with, the first board for mounting to a post.

The invention is a tool for measuring the distance and angle between two points on two surfaces to measure position of the points and surfaces relative to one another to provide the user with angle and distance measurements which fully define the relationship between the surfaces and points without additional calculations.

The invention is a tool for measuring the distance and angle between two points on two surfaces to measure position of the points and surfaces relative to one another to provide the user with angle and distance measurements which fully define the relationship between the surfaces and points without additional calculations.

A contour gauge has an elongated housing, in which a plurality of measuring teeth are arranged so as to move transverse to the extension direction of the housing, and a ruler assembly for measuring a distance to an object spaced apart from the housing in the extension direction of the housing. The ruler assembly has a first ruler which is guided on lateral walls of a guide of the housing, which can be pulled out of the guide from a first storage position within the guide into a first stop position in the extension direction of the housing, and which supports a second ruler which can be moved relative to the first ruler in the extension direction of the housing from a second storage position into a second stop position. Securing elements are provided with which the rulers can be secured to the housing or to one another.

A contour gauge has an elongated housing, in which a plurality of measuring teeth are arranged so as to move transverse to the extension direction of the housing, and a ruler assembly for measuring a distance to an object spaced apart from the housing in the extension direction of the housing. The ruler assembly has a first ruler which is guided on lateral walls of a guide of the housing, which can be pulled out of the guide from a first storage position within the guide into a first stop position in the extension direction of the housing, and which supports a second ruler which can be moved relative to the first ruler in the extension direction of the housing from a second storage position into a second stop position. Securing elements are provided with which the rulers can be secured to the housing or to one another.

A trip hazard measurement gauge is, except for a measurement module and display, constructed primarily of aluminum. A cylindrical tube has an upper straight section and a lower straight section that are interconnected by a curved section. The upper straight section and the lower straight section form an obtuse angle. A cylindrical aluminum housing is connected to the tube via a conical connecter piece. A non-movable foot is rigidly connected to the cylindrical housing. A measurement module is installed within the cylindrical housing. A slidable rule, to which a movable foot is attached to a lower end thereof, extends from the measurement module. A return spring ensures that the movable foot returns to its lowermost position. After turning ON the display, selecting the measurement system and zeroing the gauge, it is ready to measure differences in elevation between adjacent sidewalk slabs.

A trip hazard measurement gauge is, except for a measurement module and display, constructed primarily of aluminum. A cylindrical tube has an upper straight section and a lower straight section that are interconnected by a curved section. The upper straight section and the lower straight section form an obtuse angle. A cylindrical aluminum housing is connected to the tube via a conical connecter piece. A non-movable foot is rigidly connected to the cylindrical housing. A measurement module is installed within the cylindrical housing. A slidable rule, to which a movable foot is attached to a lower end thereof, extends from the measurement module. A return spring ensures that the movable foot returns to its lowermost position. After turning ON the display, selecting the measurement system and zeroing the gauge, it is ready to measure differences in elevation between adjacent sidewalk slabs.

A trip hazard measurement gauge is, except for a measurement module and display, constructed primarily of aluminum. A cylindrical tube has an upper straight section and a lower straight section that are interconnected by a curved section. The upper straight section and the lower straight section form an obtuse angle. A cylindrical aluminum housing is connected to the tube via a conical connecter piece. A non-movable foot is rigidly connected to the cylindrical housing. A measurement module is installed within the cylindrical housing. A slidable rule, to which a movable foot is attached to a lower end thereof, extends from the measurement module. A return spring ensures that the movable foot returns to its lowermost position. After turning ON the display, selecting the measurement system and zeroing the gauge, it is ready to measure differences in elevation between adjacent sidewalk slabs.