초록 ▼

A device for indicating both a horizontal direction and an angle sector about said direction, formed of a disc rotatably supported in a housing with its center of gravity offset relative to the axis of rotation of the disc, the disc being transparent except for a substantially sector-shaped non-tran

A device for indicating both a horizontal direction and an angle sector about said direction, formed of a disc rotatably supported in a housing with its center of gravity offset relative to the axis of rotation of the disc, the disc being transparent except for a substantially sector-shaped non-transparent area. Two or more reading members are provided for reading the position of said sector relative to the housing. The reading members are positioned so that said members are covered by said sector-shaped area when the housing shows a horizontal direction, and the sector-shaped area is displaced from a condition covering two or more members to a condition exposing one or more members when the disc is rotated through an angle greater than a certain angle relative to the housing.

대표청구항 ▼

A device for indicating both a horizontal direction and at least one angle sector about said direction, said device comprising a housing, a disc rotatably mounted with said housing surrounded by same and means on the disc offsetting the center of gravity of said disc relative to the axial center of

A device for indicating both a horizontal direction and at least one angle sector about said direction, said device comprising a housing, a disc rotatably mounted with said housing surrounded by same and means on the disc offsetting the center of gravity of said disc relative to the axial center of rotation thereof, said disc including a substantially sector-shaped area having a light-transmissivity different from the remainder of said disc, reading means including plural light sources and light-sensitive elements arranged in source-receiver pairs with the disc passing between each source and respective receiver and said source-receiver pairs responsive to change in light-transmissivity for indicating the position of said disc relative to the orientation of said housing, said sector-shaped area being movable with the rotation of said disc between at least two conditions, the first of said conditions occurring where all the source-receiver pairs are covered by said sector-shaped area when the orientation of the housing indicates a first horizontal direction, the second of said conditions occurring when said housing is differently oriented whereby to rotate said disc angularly a given degree, said sector-shaped area of said disc being moved with said rotation uncovering at least one of said source-receiver pairs whereby to indicate an angle sector along said horizontal direction but within said area yet other than assumed at said first condition, said disc being capable of being rotated with change of orientation of said housing whereby to expose all of said source-receiver pairs when the degree of rotation is greater than said angle sector represented by said area.