# US 7,610,689 B1 · Level having rotatable digital display unit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,610,689 B1 - Document ID: US7610689B1 - Status: Granted - Kind: B1 - Application number: 12/098,894 - Filed: 2008-04-07 - Published: 2009-10-22 - Granted: 2009-11-03 - Earliest claimed: 2008-04-07 - Inventors: Minli Zhang - Web page: https://patentgrep.com/patent/US7610689B1 ## CPC - G01C 9/06: Electric or photoelectric indication or reading means - G01C: MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY (measuring liquid level G01F; radio navigation, determining distance or velocity by use of propagation effects, e.g. Doppler effects, propagation time, of radio waves, analogous arrangements using other waves G01S) ## Abstract The utility model relates to a display means of digital level. Said digital level is provided with one notch in basal body, where said display lies. Two ends of said display are provided with two center-axles that lie in the same axis line of rotation, and two sidewalls of said notch are provided with two center-axle-holes, wherein said display is rotatablely connected with said basal body of digital level by inserting said two center-axles into said two center-axle-holes. Said display of this utility model is rotatable, so in practical application, user can locate this display on the desired position, thus to read the value shown thereon conveniently. Moreover, the positioning and position restriction to the rotation of said display could suit many conveniences for users to read the value shown thereon. ## Claims ### Claim 1 A level comprising: a basal body having at least one gauging surface; a cavity formed in the basal body; and a display unit disposed within the cavity, wherein the display unit is rotatable relative to and independently of the basal body. ### Claim 2 (depends on 1) The level of claim 1 wherein the display unit is rotatable about an axis of rotation that is parallel to the gauging surface. ### Claim 3 (depends on 2) The level of claim 2 wherein the cavity is partially defined by a pair of upright sidewalls spaced from one another and wherein each upright wall includes a center axle hole. ### Claim 4 (depends on 3) The level of claim 3 wherein the display unit includes a display body that includes a pair of center axles that lie along the axis of rotation and sized to be received by the center axle holes. ### Claim 5 (depends on 1) The level of claim 1 further comprising a bracket fitted into the cavity and adapted to receive the display unit. ### Claim 6 (depends on 5) The level of claim 5 wherein the bracket is U-shaped. ### Claim 7 (depends on 1) The level of claim 1 wherein the basal body comprises: an elongated bracket having a rear surface and a front surface, and wherein the cavity is defined between the rear surface and the front surface; a back cover board coupled to the rear surface; and a front cover board coupled to the front surface. ### Claim 8 (depends on 7) The level of claim 7 wherein the back cover board and the front cover board are each notched to define a window, and wherein the windows defined by the notched front and rear cover boards are aligned with the cavity. ### Claim 9 (depends on 7) The level of claim 7 further comprising a keypad mounted to one of the back cover board and the front cover board. ### Claim 10 A level comprising: an elongated body having a generally planar edge adapted to abut against a work surface; circuitry disposed in the elongated body for measuring a the orientation of the work surface relative to a predetermined plane; and a display unit having a visual display, wherein the display unit is mounted to the elongated body and adapted to display a digital value indicative of the orientation of the work surface relative to the predetermined plane, wherein the display unit is mounted to the elongated body so as to be rotatable about an axis of rotation relative to the elongated body. ### Claim 11 (depends on 10) The level of claim 10, wherein the circuitry and the display unit are configured and arranged such that the visual output of the display unit in a predetermined orientation upon rotation of the display unit. ### Claim 12 (depends on 10) The level of claim 10 wherein the axis of rotation is parallel to a longitudinal axis defined by the elongated body, and wherein the elongated body includes an opening extending through the elongated body along an axis transverse to the axis of rotation and wherein the display unit is mounted to the elongated body within the opening. ### Claim 13 (depends on 12) The level of claim 12 further comprising a U-shaped bracket mounted within the opening and adapted to receive the display unit. ### Claim 14 (depends on 12) The level of claim 12 wherein the elongated body includes a main bracket having a pair of upright walls bounding the opening and wherein each upright wall includes a hole such that the holes are aligned along the axis of rotation, and wherein the display unit includes a display body having a pair of center aligned axles sized to be received within the holes. ### Claim 15 (depends on 14) The level of claim 14 wherein the elongated body further includes a front cover board and a rear cover board mounted to respective surfaces of the main bracket and wherein the cover boards are each notched to define respective windows that are aligned with the opening. ### Claim 16 A digital level comprising: a main bracket, a front cover board mounted to a front surface of the main bracket, a rear cover board mounted to a rear surface of the main bracket, and wherein the main bracket, the front cover board, and the rear cover board are notched such that an opening extends through the main bracket, the front cover board, and the rear cover board; an electronic display unit mounted within the opening and pivotable about an axis of rotation parallel to a longitudinal axis defined by the main bracket, the front cover board, and the rear cover board. ### Claim 17 (depends on 16) The digital level of claim 16 wherein the electronic display unit has a display unit body sized to be received within the opening and limit rotation of the electronic display unit to less than 360 degrees about the axis of rotation. ### Claim 18 (depends on 17) The digital level of claim 17 wherein the display unit body is sized such that rotation of the electronic display unit about the axis of rotation is limited to less than 180 degrees. ### Claim 19 (depends on 17) The digital level of claim 17 wherein the display unit body includes a first upright wall having a first tab and further includes a second upright wall having a second tab, and wherein the first and the second tabs are adapted to fit within respective openings formed in the main bracket, wherein the openings are centered about the axis of rotation. ### Claim 20 (depends on 16) The digital level of claim 16 further comprising a U-shaped bracket located within a notch formed in the main bracket and adapted to receive the electronic display unit, and wherein the U-shaped bracket is secured within the notch by the front cover board and the rear cover board. ### Claim 21 (depends on 16) The digital level of claim 16 further comprising means for emitting a laser beam along a projection path generally parallel to the axis of rotation.