# US 10,119,311 B2 · Window opening limit devices and method of use > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,119,311 B2 - Document ID: US10119311B2 - Status: Granted - Kind: B2 - Application number: 14/591,151 - Filed: 2015-01-07 - Published: 2015-04-30 - Granted: 2018-11-06 - Earliest claimed: 2010-10-22 - Assignees: Amesbury Group, Inc. - Applicants: Amesbury Group, Inc. - Inventors: Steve Piltingsrud - Web page: https://patentgrep.com/patent/US10119311B2 ## CPC - E05C 17/02: by mechanical means (E05C17/60 takes precedence) - E05C 17/46: in which the wing or a member fixed thereon is engaged by a movable fastening member in a fixed position; in which a movable fastening member mounted on the wing engages a stationary member - E05C 17/60: holding sliding wings open {(E05C17/443, E05C17/54 take precedence)} - E06B 7/00: Special arrangements or measures in connection with doors or windows ({arrangements against burglary at the edges of the wings E06B5/113} ; screening or similar protective devices E06B9/00) - E06B 3/44: Vertically-sliding wings - Y10S 292/20: Window fasteners - Y10S 292/47: Sash fasteners - Y10T 292/0886: Sliding and swinging - Y10T 292/097: Operating means - Y10T 292/0997: Rigid - Y10T 292/65: Braces - E05C: BOLTS OR FASTENING DEVICES FOR WINGS, SPECIALLY FOR DOORS OR WINDOWS (latching means for sideboard or tailgate structures for vehicles B62D, {B62D33/02}; fastening devices for constructional or engineering elements E04, F16B; locks, fastening devices structurally or operatively combined or having significant cooperation with locks E05B; means for operating or controlling wing fasteners in conjunction with mechanisms for moving the wing E05F) - E06B: FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES (shades or blinds for greenhouses A01G9/22; curtains A47H; lids for car boots or bonnets B62D25/10; skylights E04B7/18; sunshades, awnings E04F10/00) - Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A method of operating a window having a sash and a window opening limit device includes moving the sash from a closed position to a limited position. When in the limited position, the window opening limit device is in a projected position, and the sash is engaged with the window opening limit device. Moving the window opening limit device to a retracted position disengages the sash and the window opening limit device. The sash may then be moved from the limited position to an open range. When the sash is returned to the closed position, the window opening limit device automatically returns to the projected position, and the sash is disengaged with the window opening limit device. ## Claims ### Claim 1 A window opening limit device comprising: a bezel comprising a front face; a housing comprising a first end and an opposite second end, wherein the second end is secured to a rear of the bezel, the housing further comprising opposed sidewalls, an upper wall, and a lower wall, wherein the sidewalls, the upper wall, and the lower wall extend between the first end and the second end, wherein at least one of the sidewalls defines a recess extending from the second end towards the first end, and wherein the recess defines at least one sliding surface; a button comprising at least one sliding projection configured to linearly slide along the at least one sliding surface, wherein the at least one sliding projection is disposed at least partially within the recess, wherein the button is configured to pivot about the at least one sliding projection, and wherein the button comprises a locking end; and a spring for simultaneously (a) biasing the locking end toward a projected position and (b) biasing the locking end towards the lower wall, wherein when in the projected position, the locking end projects beyond the front face. ### Claim 2 (depends on 1) The window opening limit device of claim 1, wherein the button is positionable in a first position and a second position, wherein the spring biases the button toward the first position. ### Claim 3 (depends on 1) The window opening limit device of claim 1, wherein the spring is connected to the housing and the button. ### Claim 4 (depends on 1) The window opening limit device of claim 1, further comprising at least one locking element for securing the window opening limit device to a window sash. ### Claim 5 (depends on 4) The window opening limit device of claim 4, wherein the at least one locking element is secured to the housing. ### Claim 6 (depends on 4) The window opening limit device of claim 4, wherein the at least one locking element is secured to the bezel. ### Claim 7 (depends on 1) The window opening limit device of claim 1, wherein the button is positionable in an upper position and a lower position, wherein the spring biases the button toward the lower position. ### Claim 8 (depends on 1) The window opening limit device of claim 1, wherein the at least one sliding projection defines two sliding projections disposed on opposite sides of the button. ### Claim 9 A window opening limit device comprising: a bezel; a slider slidably engaged with the bezel; a button movably engaged with the slider, wherein the slider and the button are together slidable between a first position and a second position along the bezel, and wherein the button is positionable in a retracted position disposed within the slider, and a projected position projecting from the slider; and a projecting spring for biasing the button linearly toward the projected position. ### Claim 10 (depends on 9) The window opening limit device of claim 9, further comprising a return spring for biasing the slider toward the first position. ### Claim 11 (depends on 9) The window opening limit device of claim 9, wherein the slider comprises a face surface, wherein when in the retracted position, the button is positioned substantially behind a plane defined by the face surface, and wherein when in the projected position, at least a portion of the button projects beyond the plane defined by the face surface.